/*
- * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* the terms and conditions for use and redistribution.
*/
-#include <cputypes.h>
-
/*-
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
* Version 2.0.
*/
#include <machine/reg.h>
+#include <machine/cpu_capabilities.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/ubc_internal.h> /* ubc_map() */
#include <sys/spawn.h>
#include <sys/spawn_internal.h>
+#include <sys/process_policy.h>
#include <sys/codesign.h>
+#include <crypto/sha1.h>
+
+#include <libkern/libkern.h>
-#include <bsm/audit_kernel.h>
+#include <security/audit/audit.h>
#include <ipc/ipc_types.h>
#include <mach/mach_types.h>
+#include <mach/port.h>
#include <mach/task.h>
+#include <mach/task_access.h>
#include <mach/thread_act.h>
#include <mach/vm_map.h>
#include <mach/mach_vm.h>
#include <mach/vm_param.h>
+#include <kern/sched_prim.h> /* thread_wakeup() */
+#include <kern/affinity.h>
+#include <kern/assert.h>
+#include <kern/task.h>
+#include <kern/coalition.h>
+
#if CONFIG_MACF
#include <security/mac.h>
#include <security/mac_mach_internal.h>
#include <vm/vm_kern.h>
#include <vm/vm_protos.h>
#include <vm/vm_kern.h>
+#include <vm/vm_fault.h>
+#include <vm/vm_pageout.h>
+
+#include <kdp/kdp_dyld.h>
+
+#include <machine/pal_routines.h>
+
+#include <pexpert/pexpert.h>
+
+#if CONFIG_MEMORYSTATUS
+#include <sys/kern_memorystatus.h>
+#endif
#if CONFIG_DTRACE
/* Do not include dtrace.h, it redefines kmem_[alloc/free] */
extern void (*dtrace_fasttrap_exec_ptr)(proc_t);
+extern void (*dtrace_proc_waitfor_exec_ptr)(proc_t);
extern void (*dtrace_helpers_cleanup)(proc_t);
extern void dtrace_lazy_dofs_destroy(proc_t);
+/*
+ * Since dtrace_proc_waitfor_exec_ptr can be added/removed in dtrace_subr.c,
+ * we will store its value before actually calling it.
+ */
+static void (*dtrace_proc_waitfor_hook)(proc_t) = NULL;
+
#include <sys/dtrace_ptss.h>
#endif
/* support for child creation in exec after vfork */
-thread_t fork_create_child(task_t parent_task, proc_t child_proc, int inherit_memory, int is64bit);
+thread_t fork_create_child(task_t parent_task, coalition_t parent_coalition, proc_t child_proc, int inherit_memory, int is64bit);
void vfork_exit(proc_t p, int rv);
-int setsigvec(proc_t, int, struct __user_sigaction *);
+int setsigvec(proc_t, thread_t, int, struct __kern_sigaction *, boolean_t in_sigstart);
+extern void proc_apply_task_networkbg_internal(proc_t, thread_t);
/*
* Mach things for which prototypes are unavailable from Mach headers
ipc_object_t *objectp);
void ipc_port_release_send(ipc_port_t);
+#if DEVELOPMENT || DEBUG
+void task_importance_update_owner_info(task_t);
+#endif
+
extern struct savearea *get_user_regs(thread_t);
+__attribute__((noinline)) int __EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__(mach_port_t task_access_port, int32_t new_pid);
#include <kern/thread.h>
#include <kern/task.h>
#include <kern/ast.h>
#include <kern/mach_loader.h>
+#include <kern/mach_fat.h>
#include <mach-o/fat.h>
#include <mach-o/loader.h>
#include <machine/vmparam.h>
#include <sys/sdt.h>
-/*
- * SIZE_MAXPTR The maximum size of a user space pointer, in bytes
- * SIZE_IMG_STRSPACE The available string space, minus two pointers; we
- * define it interms of the maximum, since we don't
- * know the pointer size going in, until after we've
- * parsed the executable image.
- */
-#define SIZE_MAXPTR 8 /* 64 bits */
-#define SIZE_IMG_STRSPACE (NCARGS - 2 * SIZE_MAXPTR)
-
/*
* EAI_ITERLIMIT The maximum number of times to iterate an image
* activator in exec_activate_image() before treating
*/
#define EAI_ITERLIMIT 10
+/*
+ * For #! interpreter parsing
+ */
+#define IS_WHITESPACE(ch) ((ch == ' ') || (ch == '\t'))
+#define IS_EOL(ch) ((ch == '#') || (ch == '\n'))
+
extern vm_map_t bsd_pageable_map;
-extern struct fileops vnops;
+extern const struct fileops vnops;
#define ROUND_PTR(type, addr) \
- (type *)( ( (unsigned)(addr) + 16 - 1) \
+ (type *)( ( (uintptr_t)(addr) + 16 - 1) \
& ~(16 - 1) )
struct image_params; /* Forward */
static int execargs_free(struct image_params *imgp);
static int exec_check_permissions(struct image_params *imgp);
static int exec_extract_strings(struct image_params *imgp);
+static int exec_add_apple_strings(struct image_params *imgp);
static int exec_handle_sugid(struct image_params *imgp);
static int sugid_scripts = 0;
-SYSCTL_INT (_kern, OID_AUTO, sugid_scripts, CTLFLAG_RW, &sugid_scripts, 0, "");
-static kern_return_t create_unix_stack(vm_map_t map, user_addr_t user_stack,
- int customstack, proc_t p);
+SYSCTL_INT (_kern, OID_AUTO, sugid_scripts, CTLFLAG_RW | CTLFLAG_LOCKED, &sugid_scripts, 0, "");
+static kern_return_t create_unix_stack(vm_map_t map, load_result_t* load_result, proc_t p);
static int copyoutptr(user_addr_t ua, user_addr_t ptr, int ptr_size);
static void exec_resettextvp(proc_t, struct image_params *);
-
-/* We don't want this one exported */
-__private_extern__
-int open1(vfs_context_t, struct nameidata *, int, struct vnode_attr *, register_t *);
+static int check_for_signature(proc_t, struct image_params *);
+static void exec_prefault_data(proc_t, struct image_params *, load_result_t *);
+static errno_t exec_handle_port_actions(struct image_params *imgp, short psa_flags, boolean_t * portwatch_present, ipc_port_t * portwatch_ports);
+static errno_t exec_handle_spawnattr_policy(proc_t p, int psa_apptype, uint64_t psa_qos_clamp,
+ ipc_port_t * portwatch_ports, int portwatch_count);
/*
- * exec_add_string
+ * exec_add_user_string
*
* Add the requested string to the string space area.
*
* Parameters; struct image_params * image parameter block
* user_addr_t string to add to strings area
+ * int segment from which string comes
+ * boolean_t TRUE if string contributes to NCARGS
*
* Returns: 0 Success
* !0 Failure errno from copyinstr()
* Implicit returns:
* (imgp->ip_strendp) updated location of next add, if any
* (imgp->ip_strspace) updated byte count of space remaining
+ * (imgp->ip_argspace) updated byte count of space in NCARGS
*/
static int
-exec_add_string(struct image_params *imgp, user_addr_t str)
+exec_add_user_string(struct image_params *imgp, user_addr_t str, int seg, boolean_t is_ncargs)
{
- int error = 0;
-
- do {
- size_t len = 0;
- if (imgp->ip_strspace <= 0) {
+ int error = 0;
+
+ do {
+ size_t len = 0;
+ int space;
+
+ if (is_ncargs)
+ space = imgp->ip_argspace; /* by definition smaller than ip_strspace */
+ else
+ space = imgp->ip_strspace;
+
+ if (space <= 0) {
error = E2BIG;
break;
}
- if (IS_UIO_SYS_SPACE(imgp->ip_seg)) {
+
+ if (!UIO_SEG_IS_USER_SPACE(seg)) {
char *kstr = CAST_DOWN(char *,str); /* SAFE */
- error = copystr(kstr, imgp->ip_strendp, imgp->ip_strspace, &len);
+ error = copystr(kstr, imgp->ip_strendp, space, &len);
} else {
- error = copyinstr(str, imgp->ip_strendp, imgp->ip_strspace,
- &len);
+ error = copyinstr(str, imgp->ip_strendp, space, &len);
}
+
imgp->ip_strendp += len;
imgp->ip_strspace -= len;
+ if (is_ncargs)
+ imgp->ip_argspace -= len;
+
} while (error == ENAMETOOLONG);
-
+
return error;
}
* To support new app package launching for Mac OS X, the dyld needs the
* first argument to execve() stored on the user stack.
*
- * Save the executable path name at the top of the strings area and set
+ * Save the executable path name at the bottom of the strings area and set
* the argument vector pointer to the location following that to indicate
* the start of the argument and environment tuples, setting the remaining
- * string space count to the size of the string area minus the path length
- * and a reserve for two pointers.
+ * string space count to the size of the string area minus the path length.
*
* Parameters; struct image_params * image parameter block
* char * path used to invoke program
* Implicit returns:
* (imgp->ip_strings) saved path
* (imgp->ip_strspace) space remaining in ip_strings
- * (imgp->ip_argv) beginning of argument list
* (imgp->ip_strendp) start of remaining copy area
+ * (imgp->ip_argspace) space remaining of NCARGS
+ * (imgp->ip_applec) Initial applev[0]
*
* Note: We have to do this before the initial namei() since in the
* path contains symbolic links, namei() will overwrite the
{
int error;
size_t len;
- char *kpath = CAST_DOWN(char *,path); /* SAFE */
-
- imgp->ip_strendp = imgp->ip_strings;
- imgp->ip_strspace = SIZE_IMG_STRSPACE;
+ char *kpath;
len = MIN(MAXPATHLEN, imgp->ip_strspace);
case UIO_USERSPACE64: /* Same for copyin()... */
error = copyinstr(path, imgp->ip_strings, len, &len);
break;
- case UIO_SYSSPACE32:
+ case UIO_SYSSPACE:
+ kpath = CAST_DOWN(char *,path); /* SAFE */
error = copystr(kpath, imgp->ip_strings, len, &len);
break;
default:
if (!error) {
imgp->ip_strendp += len;
imgp->ip_strspace -= len;
- imgp->ip_argv = imgp->ip_strendp;
}
return(error);
}
-#ifdef IMGPF_POWERPC
/*
- * exec_powerpc32_imgact
- *
- * Implicitly invoke the PowerPC handler for a byte-swapped image magic
- * number. This may happen either as a result of an attempt to invoke a
- * PowerPC image directly, or indirectly as the interpreter used in an
- * interpreter script.
+ * exec_reset_save_path
*
- * Parameters; struct image_params * image parameter block
+ * If we detect a shell script, we need to reset the string area
+ * state so that the interpreter can be saved onto the stack.
+
+ * Parameters; struct image_params * image parameter block
*
- * Returns: -1 not an PowerPC image (keep looking)
- * -3 Success: exec_archhandler_ppc: relookup
- * >0 Failure: exec_archhandler_ppc: error number
+ * Returns: int 0 Success
*
- * Note: This image activator does not handle the case of a direct
- * invocation of the exec_archhandler_ppc, since in that case, the
- * exec_archhandler_ppc itself is not a PowerPC binary; instead,
- * binary image activators must recognize the exec_archhandler_ppc;
- * This is managed in exec_check_permissions().
+ * Implicit returns:
+ * (imgp->ip_strings) saved path
+ * (imgp->ip_strspace) space remaining in ip_strings
+ * (imgp->ip_strendp) start of remaining copy area
+ * (imgp->ip_argspace) space remaining of NCARGS
*
- * Note: This image activator is limited to 32 bit powerpc images;
- * if support for 64 bit powerpc images is desired, it would
- * be more in line with this design to write a separate 64 bit
- * image activator.
*/
static int
-exec_powerpc32_imgact(struct image_params *imgp)
+exec_reset_save_path(struct image_params *imgp)
{
- struct mach_header *mach_header = (struct mach_header *)imgp->ip_vdata;
- int error;
- size_t len = 0;
-
- /*
- * Make sure it's a PowerPC binary. If we've already redirected
- * from an interpreted file once, don't do it again.
- */
- if (mach_header->magic != MH_CIGAM) {
- /*
- * If it's a cross-architecture 64 bit binary, then claim
- * it, but refuse to run it.
- */
- if (mach_header->magic == MH_CIGAM_64)
- return (EBADARCH);
- return (-1);
- }
-
- /* If there is no exec_archhandler_ppc, we can't run it */
- if (exec_archhandler_ppc.path[0] == 0)
- return (EBADARCH);
-
- /* Remember the type of the original file for later grading */
- if (!imgp->ip_origcputype) {
- imgp->ip_origcputype =
- OSSwapBigToHostInt32(mach_header->cputype);
- imgp->ip_origcpusubtype =
- OSSwapBigToHostInt32(mach_header->cpusubtype);
- }
-
- /*
- * The PowerPC flag will be set by the exec_check_permissions()
- * call anyway; however, we set this flag here so that the relookup
- * in execve() does not follow symbolic links, as a side effect.
- */
- imgp->ip_flags |= IMGPF_POWERPC;
-
- /* impute an interpreter */
- error = copystr(exec_archhandler_ppc.path, imgp->ip_interp_name,
- IMG_SHSIZE, &len);
- if (error)
- return (error);
-
- /*
- * provide a replacement string for p->p_comm; we have to use an
- * an alternate buffer for this, rather than replacing it directly,
- * since the exec may fail and return to the parent. In that case,
- * we would have erroneously changed the parent p->p_comm instead.
- */
- strlcpy(imgp->ip_p_comm, imgp->ip_ndp->ni_cnd.cn_nameptr, MAXCOMLEN);
+ imgp->ip_strendp = imgp->ip_strings;
+ imgp->ip_argspace = NCARGS;
+ imgp->ip_strspace = ( NCARGS + PAGE_SIZE );
- return (-3);
+ return (0);
}
-#endif /* IMGPF_POWERPC */
-
/*
* exec_shell_imgact
{
char *vdata = imgp->ip_vdata;
char *ihp;
- char *line_endp;
+ char *line_startp, *line_endp;
char *interp;
- char temp[16];
proc_t p;
struct fileproc *fp;
int fd;
int error;
- size_t len;
/*
* Make sure it's a shell script. If we've already redirected
return (-1);
}
-#ifdef IMGPF_POWERPC
- if ((imgp->ip_flags & IMGPF_POWERPC) != 0)
- return (EBADARCH);
-#endif /* IMGPF_POWERPC */
-
imgp->ip_flags |= IMGPF_INTERPRET;
+ imgp->ip_interp_sugid_fd = -1;
+ imgp->ip_interp_buffer[0] = '\0';
- /* Check to see if SUGID scripts are permitted. If they aren't then
+ /* Check to see if SUGID scripts are permitted. If they aren't then
* clear the SUGID bits.
* imgp->ip_vattr is known to be valid.
- */
- if (sugid_scripts == 0) {
- imgp->ip_origvattr->va_mode &= ~(VSUID | VSGID);
+ */
+ if (sugid_scripts == 0) {
+ imgp->ip_origvattr->va_mode &= ~(VSUID | VSGID);
}
- /* Find the nominal end of the interpreter line */
- for( ihp = &vdata[2]; *ihp != '\n' && *ihp != '#'; ihp++) {
- if (ihp >= &vdata[IMG_SHSIZE])
+ /* Try to find the first non-whitespace character */
+ for( ihp = &vdata[2]; ihp < &vdata[IMG_SHSIZE]; ihp++ ) {
+ if (IS_EOL(*ihp)) {
+ /* Did not find interpreter, "#!\n" */
return (ENOEXEC);
+ } else if (IS_WHITESPACE(*ihp)) {
+ /* Whitespace, like "#! /bin/sh\n", keep going. */
+ } else {
+ /* Found start of interpreter */
+ break;
+ }
+ }
+
+ if (ihp == &vdata[IMG_SHSIZE]) {
+ /* All whitespace, like "#! " */
+ return (ENOEXEC);
}
- line_endp = ihp;
- ihp = &vdata[2];
- /* Skip over leading spaces - until the interpreter name */
- while ( ihp < line_endp && ((*ihp == ' ') || (*ihp == '\t')))
- ihp++;
+ line_startp = ihp;
- /*
- * Find the last non-whitespace character before the end of line or
- * the beginning of a comment; this is our new end of line.
- */
- for (;line_endp > ihp && ((*line_endp == ' ') || (*line_endp == '\t')); line_endp--)
- continue;
+ /* Try to find the end of the interpreter+args string */
+ for ( ; ihp < &vdata[IMG_SHSIZE]; ihp++ ) {
+ if (IS_EOL(*ihp)) {
+ /* Got it */
+ break;
+ } else {
+ /* Still part of interpreter or args */
+ }
+ }
- /* Empty? */
- if (line_endp == ihp)
+ if (ihp == &vdata[IMG_SHSIZE]) {
+ /* A long line, like "#! blah blah blah" without end */
return (ENOEXEC);
+ }
- /* copy the interpreter name */
- interp = imgp->ip_interp_name;
- while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t'))
- *interp++ = *ihp++;
- *interp = '\0';
+ /* Backtrack until we find the last non-whitespace */
+ while (IS_EOL(*ihp) || IS_WHITESPACE(*ihp)) {
+ ihp--;
+ }
- exec_save_path(imgp, CAST_USER_ADDR_T(imgp->ip_interp_name),
- UIO_SYSSPACE32);
+ /* The character after the last non-whitespace is our logical end of line */
+ line_endp = ihp + 1;
- ihp = &vdata[2];
- while (ihp < line_endp) {
- /* Skip leading whitespace before each argument */
- while ((*ihp == ' ') || (*ihp == '\t'))
- ihp++;
+ /*
+ * Now we have pointers to the usable part of:
+ *
+ * "#! /usr/bin/int first second third \n"
+ * ^ line_startp ^ line_endp
+ */
- if (ihp >= line_endp)
- break;
+ /* copy the interpreter name */
+ interp = imgp->ip_interp_buffer;
+ for ( ihp = line_startp; (ihp < line_endp) && !IS_WHITESPACE(*ihp); ihp++)
+ *interp++ = *ihp;
+ *interp = '\0';
- /* We have an argument; copy it */
- while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t')) {
- *imgp->ip_strendp++ = *ihp++;
- imgp->ip_strspace--;
- }
- *imgp->ip_strendp++ = 0;
- imgp->ip_strspace--;
- imgp->ip_argc++;
- }
+ exec_reset_save_path(imgp);
+ exec_save_path(imgp, CAST_USER_ADDR_T(imgp->ip_interp_buffer),
+ UIO_SYSSPACE);
+
+ /* Copy the entire interpreter + args for later processing into argv[] */
+ interp = imgp->ip_interp_buffer;
+ for ( ihp = line_startp; (ihp < line_endp); ihp++)
+ *interp++ = *ihp;
+ *interp = '\0';
/*
* If we have a SUID oder SGID script, create a file descriptor
return(error);
fp->f_fglob->fg_flag = FREAD;
- fp->f_fglob->fg_type = DTYPE_VNODE;
fp->f_fglob->fg_ops = &vnops;
fp->f_fglob->fg_data = (caddr_t)imgp->ip_vp;
proc_fdunlock(p);
vnode_ref(imgp->ip_vp);
- snprintf(temp, sizeof(temp), "/dev/fd/%d", fd);
- error = copyoutstr(temp, imgp->ip_user_fname, sizeof(temp), &len);
- if (error)
- return(error);
+ imgp->ip_interp_sugid_fd = fd;
}
return (-3);
goto bad;
}
+#if DEVELOPMENT || DEBUG
+ if (cpu_type() == CPU_TYPE_ARM64) {
+ uint32_t fat_nfat_arch = OSSwapBigToHostInt32(fat_header->nfat_arch);
+ struct fat_arch *archs;
+ int vfexec = (imgp->ip_flags & IMGPF_VFORK_EXEC);
+ int spawn = (imgp->ip_flags & IMGPF_SPAWN);
+
+ archs = (struct fat_arch *)(imgp->ip_vdata + sizeof(struct fat_header));
+
+ /* ip_vdata always has PAGE_SIZE of data */
+ if (PAGE_SIZE >= (sizeof(struct fat_header) + (fat_nfat_arch + 1) * sizeof(struct fat_arch))) {
+ if (fat_nfat_arch > 0
+ && OSSwapBigToHostInt32(archs[fat_nfat_arch].cputype) == CPU_TYPE_ARM64) {
+
+ /* rdar://problem/15001727 */
+ printf("Attempt to execute malformed binary %s\n", imgp->ip_strings);
+
+ proc_lock(p);
+ p->p_csflags |= CS_KILLED;
+ proc_unlock(p);
+
+ /*
+ * We can't stop the system call, so make sure the child never executes
+ * For vfork exec, the current implementation has not set up the thread in the
+ * child process, so we cannot signal it. Return an error code in that case.
+ */
+ if (!vfexec && !spawn) {
+ psignal(p, SIGKILL);
+ error = 0;
+ } else {
+ error = EBADEXEC;
+ }
+ goto bad;
+ }
+ }
+ }
+#endif
+
/* If posix_spawn binprefs exist, respect those prefs. */
psa = (struct _posix_spawnattr *) imgp->ip_px_sa;
if (psa != NULL && psa->psa_binprefs[0] != 0) {
/* Read the Mach-O header out of fat_arch */
error = vn_rdwr(UIO_READ, imgp->ip_vp, imgp->ip_vdata,
PAGE_SIZE, fat_arch.offset,
- UIO_SYSSPACE32, (IO_UNIT|IO_NODELOCKED),
+ UIO_SYSSPACE, (IO_UNIT|IO_NODELOCKED),
cred, &resid, p);
if (error) {
goto bad;
struct mach_header *mach_header = (struct mach_header *)imgp->ip_vdata;
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
int error = 0;
- int vfexec = 0;
task_t task;
task_t new_task = NULL; /* protected by vfexec */
thread_t thread;
load_return_t lret;
load_result_t load_result;
struct _posix_spawnattr *psa = NULL;
+ int spawn = (imgp->ip_flags & IMGPF_SPAWN);
+ int vfexec = (imgp->ip_flags & IMGPF_VFORK_EXEC);
/*
* make sure it's a Mach-O 1.0 or Mach-O 2.0 binary; the difference
* is a reserved field on the end, so for the most part, we can
- * treat them as if they were identical.
- */
+ * treat them as if they were identical. Reverse-endian Mach-O
+ * binaries are recognized but not compatible.
+ */
+ if ((mach_header->magic == MH_CIGAM) ||
+ (mach_header->magic == MH_CIGAM_64)) {
+ error = EBADARCH;
+ goto bad;
+ }
+
if ((mach_header->magic != MH_MAGIC) &&
(mach_header->magic != MH_MAGIC_64)) {
error = -1;
thread = current_thread();
uthread = get_bsdthread_info(thread);
- if (uthread->uu_flag & UT_VFORK)
- vfexec = 1; /* Mark in exec */
-
if ((mach_header->cputype & CPU_ARCH_ABI64) == CPU_ARCH_ABI64)
imgp->ip_flags |= IMGPF_IS_64BIT;
goto bad;
}
grade:
- if (!grade_binary(imgp->ip_origcputype & ~CPU_SUBTYPE_LIB64,
- imgp->ip_origcpusubtype & ~CPU_SUBTYPE_MASK)) {
+ if (!grade_binary(imgp->ip_origcputype, imgp->ip_origcpusubtype & ~CPU_SUBTYPE_MASK)) {
error = EBADARCH;
goto bad;
}
if (error)
goto bad;
- /*
- * Hack for binary compatability; put three NULs on the end of the
- * string area, and round it up to the next word boundary. This
- * ensures padding with NULs to the boundary.
- */
- imgp->ip_strendp[0] = 0;
- imgp->ip_strendp[1] = 0;
- imgp->ip_strendp[2] = 0;
- imgp->ip_strendp += (((imgp->ip_strendp - imgp->ip_strings) + NBPW-1) & ~(NBPW-1));
+ error = exec_add_apple_strings(imgp);
+ if (error)
+ goto bad;
+
+ AUDIT_ARG(argv, imgp->ip_startargv, imgp->ip_argc,
+ imgp->ip_endargv - imgp->ip_startargv);
+ AUDIT_ARG(envv, imgp->ip_endargv, imgp->ip_envc,
+ imgp->ip_endenvv - imgp->ip_endargv);
-#ifdef IMGPF_POWERPC
/*
- * XXX
- *
- * Should be factored out; this is here because we might be getting
- * invoked this way as the result of a shell script, and the check
- * in exec_check_permissions() is not interior to the jump back up
- * to the "encapsulated_binary:" label in exec_activate_image().
+ * We are being called to activate an image subsequent to a vfork()
+ * operation; in this case, we know that our task, thread, and
+ * uthread are actually those of our parent, and our proc, which we
+ * obtained indirectly from the image_params vfs_context_t, is the
+ * new child process.
*/
- if (imgp->ip_vattr->va_fsid == exec_archhandler_ppc.fsid &&
- imgp->ip_vattr->va_fileid == (uint64_t)((u_long)exec_archhandler_ppc.fileid)) {
- imgp->ip_flags |= IMGPF_POWERPC;
- }
-#endif /* IMGPF_POWERPC */
-
- if (vfexec) {
- imgp->ip_vfork_thread = fork_create_child(task, p, FALSE, (imgp->ip_flags & IMGPF_IS_64BIT));
- if (imgp->ip_vfork_thread == NULL) {
- error = ENOMEM;
- goto bad;
+ if (vfexec || spawn) {
+ if (vfexec) {
+ imgp->ip_new_thread = fork_create_child(task, COALITION_NULL, p, FALSE, (imgp->ip_flags & IMGPF_IS_64BIT));
+ if (imgp->ip_new_thread == NULL) {
+ error = ENOMEM;
+ goto bad;
+ }
}
+
/* reset local idea of thread, uthread, task */
- thread = imgp->ip_vfork_thread;
+ thread = imgp->ip_new_thread;
uthread = get_bsdthread_info(thread);
task = new_task = get_threadtask(thread);
map = get_task_map(task);
* We set these flags here; this is OK, since if we fail after
* this point, we have already destroyed the parent process anyway.
*/
+ task_set_dyld_info(task, MACH_VM_MIN_ADDRESS, 0);
if (imgp->ip_flags & IMGPF_IS_64BIT) {
task_set_64bit(task, TRUE);
- OSBitOrAtomic(P_LP64, (UInt32 *)&p->p_flag);
+ OSBitOrAtomic(P_LP64, &p->p_flag);
} else {
task_set_64bit(task, FALSE);
- OSBitAndAtomic(~((uint32_t)P_LP64), (UInt32 *)&p->p_flag);
+ OSBitAndAtomic(~((uint32_t)P_LP64), &p->p_flag);
}
/*
* Load the Mach-O file.
- */
-
- /*
+ *
* NOTE: An error after this point indicates we have potentially
- * destroyed or overwrote some process state while attempting an
+ * destroyed or overwritten some process state while attempting an
* execve() following a vfork(), which is an unrecoverable condition.
+ * We send the new process an immediate SIGKILL to avoid it executing
+ * any instructions in the mutated address space. For true spawns,
+ * this is not the case, and "too late" is still not too late to
+ * return an error code to the parent process.
*/
- /*
- * We reset the task to 64-bit (or not) here. It may have picked up
- * a new map, and we need that to reflect its true 64-bit nature.
- */
-
- task_set_64bit(task,
- ((imgp->ip_flags & IMGPF_IS_64BIT) == IMGPF_IS_64BIT));
-
/*
* Actually load the image file we previously decided to load.
*/
goto badtoolate;
}
+ proc_lock(p);
+ p->p_cputype = imgp->ip_origcputype;
+ p->p_cpusubtype = imgp->ip_origcpusubtype;
+ proc_unlock(p);
+
vm_map_set_user_wire_limit(get_task_map(task), p->p_rlimit[RLIMIT_MEMLOCK].rlim_cur);
/*
* requested them on exec.
*/
if (load_result.csflags & CS_VALID) {
- imgp->ip_csflags |= load_result.csflags &
+ imgp->ip_csflags |= load_result.csflags &
(CS_VALID|
- CS_HARD|CS_KILL|CS_EXEC_SET_HARD|CS_EXEC_SET_KILL);
+ CS_HARD|CS_KILL|CS_ENFORCEMENT|CS_REQUIRE_LV|CS_DYLD_PLATFORM|
+ CS_EXEC_SET_HARD|CS_EXEC_SET_KILL|CS_EXEC_SET_ENFORCEMENT);
} else {
imgp->ip_csflags &= ~CS_VALID;
}
imgp->ip_csflags |= CS_HARD;
if (p->p_csflags & CS_EXEC_SET_KILL)
imgp->ip_csflags |= CS_KILL;
+ if (p->p_csflags & CS_EXEC_SET_ENFORCEMENT)
+ imgp->ip_csflags |= CS_ENFORCEMENT;
+ if (p->p_csflags & CS_EXEC_SET_INSTALLER)
+ imgp->ip_csflags |= CS_INSTALLER;
/*
vm_map_exec(get_task_map(task),
task,
(void *) p->p_fd->fd_rdir,
-#ifdef IMGPF_POWERPC
- imgp->ip_flags & IMGPF_POWERPC ?
- CPU_TYPE_POWERPC :
-#endif
cpu_type());
/*
- * Close file descriptors
- * which specify close-on-exec.
+ * Close file descriptors which specify close-on-exec.
*/
- fdexec(p);
+ fdexec(p, psa != NULL ? psa->psa_flags : 0);
/*
* deal with set[ug]id.
*/
error = exec_handle_sugid(imgp);
-
- if (!vfexec && (p->p_lflag & P_LTRACED))
- psignal(p, SIGTRAP);
-
if (error) {
goto badtoolate;
- }
-
-#if CONFIG_MACF
- /* Determine if the map will allow VM_PROT_COPY */
- error = mac_proc_check_map_prot_copy_allow(p);
- vm_map_set_prot_copy_allow(get_task_map(task),
- error ? FALSE : TRUE);
-#endif
+ }
+
+ /*
+ * deal with voucher on exec-calling thread.
+ */
+ if (imgp->ip_new_thread == NULL)
+ thread_set_mach_voucher(current_thread(), IPC_VOUCHER_NULL);
+
+ /* Make sure we won't interrupt ourself signalling a partial process */
+ if (!vfexec && !spawn && (p->p_lflag & P_LTRACED))
+ psignal(p, SIGTRAP);
if (load_result.unixproc &&
create_unix_stack(get_task_map(task),
- load_result.user_stack,
- load_result.customstack,
+ &load_result,
p) != KERN_SUCCESS) {
error = load_return_to_errno(LOAD_NOSPACE);
goto badtoolate;
}
- if (vfexec) {
+ if (vfexec || spawn) {
old_map = vm_map_switch(get_task_map(task));
}
ap = p->user_stack;
error = exec_copyout_strings(imgp, &ap);
if (error) {
- if (vfexec)
+ if (vfexec || spawn)
vm_map_switch(old_map);
goto badtoolate;
}
if (load_result.dynlinker) {
uint64_t ap;
+ int new_ptr_size = (imgp->ip_flags & IMGPF_IS_64BIT) ? 8 : 4;
/* Adjust the stack */
- if (imgp->ip_flags & IMGPF_IS_64BIT) {
- ap = thread_adjuserstack(thread, -8);
- error = copyoutptr(load_result.mach_header, ap, 8);
- } else {
- ap = thread_adjuserstack(thread, -4);
- error = suword(ap, load_result.mach_header);
- }
+ ap = thread_adjuserstack(thread, -new_ptr_size);
+ error = copyoutptr(load_result.mach_header, ap, new_ptr_size);
+
if (error) {
- if (vfexec)
- vm_map_switch(old_map);
+ if (vfexec || spawn)
+ vm_map_switch(old_map);
goto badtoolate;
}
+ task_set_dyld_info(task, load_result.all_image_info_addr,
+ load_result.all_image_info_size);
}
- if (vfexec) {
+ /* Avoid immediate VM faults back into kernel */
+ exec_prefault_data(p, imgp, &load_result);
+
+ if (vfexec || spawn) {
vm_map_switch(old_map);
}
/* Set the entry point */
p->p_comm[imgp->ip_ndp->ni_cnd.cn_namelen] = '\0';
}
+ pal_dbg_set_task_name( p->task );
+
+#if DEVELOPMENT || DEBUG
+ /*
+ * Update the pid an proc name for importance base if any
+ */
+ task_importance_update_owner_info(p->task);
+#endif
+
+ memcpy(&p->p_uuid[0], &load_result.uuid[0], sizeof(p->p_uuid));
+
+// <rdar://6598155> dtrace code cleanup needed
#if CONFIG_DTRACE
/*
* Invalidate any predicate evaluation already cached for this thread by DTrace.
*/
proc_lock(p);
if (p->p_dtrace_probes && dtrace_fasttrap_exec_ptr) {
- (*dtrace_fasttrap_exec_ptr)(p);
- }
+ (*dtrace_fasttrap_exec_ptr)(p);
+ }
proc_unlock(p);
#endif
*/
kdbg_trace_string(p, &dbg_arg1, &dbg_arg2, &dbg_arg3, &dbg_arg4);
- if (vfexec) {
+ if (vfexec || spawn) {
KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_DATA, 2)) | DBG_FUNC_NONE,
- p->p_pid ,0,0,0, (unsigned int)thread);
+ p->p_pid ,0,0,0, (uintptr_t)thread_tid(thread));
KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
- dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, (unsigned int)thread);
+ dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, (uintptr_t)thread_tid(thread));
} else {
KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_DATA, 2)) | DBG_FUNC_NONE,
p->p_pid ,0,0,0,0);
}
}
-#ifdef IMGPF_POWERPC
/*
- * Mark the process as powerpc or not. If powerpc, set the affinity
- * flag, which will be used for grading binaries in future exec's
- * from the process.
+ * Ensure the 'translated' and 'affinity' flags are cleared, since we
+ * no longer run PowerPC binaries.
*/
- if (((imgp->ip_flags & IMGPF_POWERPC) != 0))
- OSBitOrAtomic(P_TRANSLATED, (UInt32 *)&p->p_flag);
- else
-#endif /* IMGPF_POWERPC */
- OSBitAndAtomic(~((uint32_t)P_TRANSLATED), (UInt32 *)&p->p_flag);
- OSBitAndAtomic(~((uint32_t)P_AFFINITY), (UInt32 *)&p->p_flag);
+ OSBitAndAtomic(~((uint32_t)(P_TRANSLATED | P_AFFINITY)), &p->p_flag);
/*
* If posix_spawned with the START_SUSPENDED flag, stop the
/*
* mark as execed, wakeup the process that vforked (if any) and tell
- * it that it now has it's own resources back
+ * it that it now has its own resources back
*/
- OSBitOrAtomic(P_EXEC, (UInt32 *)&p->p_flag);
+ OSBitOrAtomic(P_EXEC, &p->p_flag);
+ proc_resetregister(p);
if (p->p_pptr && (p->p_lflag & P_LPPWAIT)) {
proc_lock(p);
p->p_lflag &= ~P_LPPWAIT;
wakeup((caddr_t)p->p_pptr);
}
+ /*
+ * Pay for our earlier safety; deliver the delayed signals from
+ * the incomplete vfexec process now that it's complete.
+ */
if (vfexec && (p->p_lflag & P_LTRACED)) {
psignal_vfork(p, new_task, thread, SIGTRAP);
}
+ goto done;
+
badtoolate:
- proc_knote(p, NOTE_EXEC);
+ /* Don't allow child process to execute any instructions */
+ if (!spawn) {
+ if (vfexec) {
+ psignal_vfork(p, new_task, thread, SIGKILL);
+ } else {
+ psignal(p, SIGKILL);
+ }
+
+ /* We can't stop this system call at this point, so just pretend we succeeded */
+ error = 0;
+ }
+
+done:
+ if (!spawn) {
+ /* notify only if it has not failed due to FP Key error */
+ if ((p->p_lflag & P_LTERM_DECRYPTFAIL) == 0)
+ proc_knote(p, NOTE_EXEC);
+ }
- if (vfexec) {
+ /* Drop extra references for cases where we don't expect the caller to clean up */
+ if (vfexec || (spawn && error == 0)) {
task_deallocate(new_task);
thread_deallocate(thread);
- if (error)
- error = 0;
}
bad:
} execsw[] = {
{ exec_mach_imgact, "Mach-o Binary" },
{ exec_fat_imgact, "Fat Binary" },
-#ifdef IMGPF_POWERPC
- { exec_powerpc32_imgact, "PowerPC binary" },
-#endif /* IMGPF_POWERPC */
{ exec_shell_imgact, "Interpreter Script" },
{ NULL, NULL}
};
static int
exec_activate_image(struct image_params *imgp)
{
- struct nameidata nd;
+ struct nameidata *ndp = NULL;
int error;
int resid;
int once = 1; /* save SGUID-ness for interpreted files */
error = execargs_alloc(imgp);
if (error)
- goto bad;
+ goto bad_notrans;
- /*
- * XXXAUDIT: Note: the double copyin introduces an audit
- * race. To correct this race, we must use a single
- * copyin(), e.g. by passing a flag to namei to indicate an
- * external path buffer is being used.
- */
error = exec_save_path(imgp, imgp->ip_user_fname, imgp->ip_seg);
if (error) {
goto bad_notrans;
}
+ /* Use imgp->ip_strings, which contains the copyin-ed exec path */
DTRACE_PROC1(exec, uintptr_t, imgp->ip_strings);
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
- imgp->ip_seg, imgp->ip_user_fname, imgp->ip_vfs_context);
+ MALLOC(ndp, struct nameidata *, sizeof(*ndp), M_TEMP, M_WAITOK | M_ZERO);
+ if (ndp == NULL) {
+ error = ENOMEM;
+ goto bad_notrans;
+ }
+
+ NDINIT(ndp, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(imgp->ip_strings), imgp->ip_vfs_context);
again:
- error = namei(&nd);
+ error = namei(ndp);
if (error)
goto bad_notrans;
- imgp->ip_ndp = &nd; /* successful namei(); call nameidone() later */
- imgp->ip_vp = nd.ni_vp; /* if set, need to vnode_put() at some point */
+ imgp->ip_ndp = ndp; /* successful namei(); call nameidone() later */
+ imgp->ip_vp = ndp->ni_vp; /* if set, need to vnode_put() at some point */
- proc_transstart(p, 0);
+ /*
+ * Before we start the transition from binary A to binary B, make
+ * sure another thread hasn't started exiting the process. We grab
+ * the proc lock to check p_lflag initially, and the transition
+ * mechanism ensures that the value doesn't change after we release
+ * the lock.
+ */
+ proc_lock(p);
+ if (p->p_lflag & P_LEXIT) {
+ proc_unlock(p);
+ goto bad_notrans;
+ }
+ error = proc_transstart(p, 1, 0);
+ proc_unlock(p);
+ if (error)
+ goto bad_notrans;
error = exec_check_permissions(imgp);
if (error)
}
error = vn_rdwr(UIO_READ, imgp->ip_vp, imgp->ip_vdata, PAGE_SIZE, 0,
- UIO_SYSSPACE32, IO_NODELOCKED,
+ UIO_SYSSPACE, IO_NODELOCKED,
vfs_context_ucred(imgp->ip_vfs_context),
&resid, vfs_context_proc(imgp->ip_vfs_context));
if (error)
break;
}
mac_vnode_label_copy(imgp->ip_vp->v_label,
- imgp->ip_scriptlabelp);
+ imgp->ip_scriptlabelp);
+
+ /*
+ * Take a ref of the script vnode for later use.
+ */
+ if (imgp->ip_scriptvp)
+ vnode_put(imgp->ip_scriptvp);
+ if (vnode_getwithref(imgp->ip_vp) == 0)
+ imgp->ip_scriptvp = imgp->ip_vp;
#endif
+
+ nameidone(ndp);
+
vnode_put(imgp->ip_vp);
imgp->ip_vp = NULL; /* already put */
- nd.ni_cnd.cn_nameiop = LOOKUP;
- nd.ni_cnd.cn_flags = (nd.ni_cnd.cn_flags & HASBUF) |
- (FOLLOW | LOCKLEAF);
+ imgp->ip_ndp = NULL; /* already nameidone */
-#ifdef IMGPF_POWERPC
- /*
- * PowerPC does not follow symlinks because the
- * code which sets exec_archhandler_ppc.fsid and
- * exec_archhandler_ppc.fileid doesn't follow them.
- */
- if (imgp->ip_flags & IMGPF_POWERPC)
- nd.ni_cnd.cn_flags &= ~FOLLOW;
-#endif /* IMGPF_POWERPC */
+ /* Use imgp->ip_strings, which exec_shell_imgact reset to the interpreter */
+ NDINIT(ndp, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(imgp->ip_strings), imgp->ip_vfs_context);
- nd.ni_segflg = UIO_SYSSPACE32;
- nd.ni_dirp = CAST_USER_ADDR_T(imgp->ip_interp_name);
proc_transend(p, 0);
goto again;
if (error == 0 && kauth_authorize_fileop_has_listeners()) {
kauth_authorize_fileop(vfs_context_ucred(imgp->ip_vfs_context),
KAUTH_FILEOP_EXEC,
- (uintptr_t)nd.ni_vp, 0);
+ (uintptr_t)ndp->ni_vp, 0);
}
bad:
execargs_free(imgp);
if (imgp->ip_ndp)
nameidone(imgp->ip_ndp);
+ if (ndp)
+ FREE(ndp, M_TEMP);
return (error);
}
+
/*
- * exec_handle_port_actions
+ * exec_handle_spawnattr_policy
*
- * Description: Go through the _posix_port_actions_t contents,
- * calling task_set_special_port and task_set_exception_ports
- * for the current task.
+ * Description: Decode and apply the posix_spawn apptype, qos clamp, and watchport ports to the task.
*
- * Parameters: struct image_params * Image parameter block
+ * Parameters: proc_t p process to apply attributes to
+ * int psa_apptype posix spawn attribute apptype
*
- * Returns: 0 Success
- * KERN_FAILURE Failure
+ * Returns: 0 Success
*/
-static int
-exec_handle_port_actions(struct image_params *imgp)
+static errno_t
+exec_handle_spawnattr_policy(proc_t p, int psa_apptype, uint64_t psa_qos_clamp,
+ ipc_port_t * portwatch_ports, int portwatch_count)
{
- _posix_spawn_port_actions_t pacts = imgp->ip_px_spa;
- proc_t p = vfs_context_proc(imgp->ip_vfs_context);
- _ps_port_action_t *act = NULL;
- task_t task = p->task;
- ipc_port_t port = NULL;
- kern_return_t ret = KERN_SUCCESS;
- int i;
-
- for (i = 0; i < pacts->pspa_count; i++) {
- act = &pacts->pspa_actions[i];
-
- ret = ipc_object_copyin(get_task_ipcspace(current_task()),
- (mach_port_name_t) act->new_port,
- MACH_MSG_TYPE_COPY_SEND,
- (ipc_object_t *) &port);
+ int apptype = TASK_APPTYPE_NONE;
+ int qos_clamp = THREAD_QOS_UNSPECIFIED;
- if (ret)
- return ret;
+ if ((psa_apptype & POSIX_SPAWN_PROC_TYPE_MASK) != 0) {
+ int proctype = psa_apptype & POSIX_SPAWN_PROC_TYPE_MASK;
- switch (act->port_type) {
- case PSPA_SPECIAL:
- ret = task_set_special_port(task,
- act->which,
- port);
+ switch(proctype) {
+ case POSIX_SPAWN_PROC_TYPE_DAEMON_INTERACTIVE:
+ apptype = TASK_APPTYPE_DAEMON_INTERACTIVE;
+ break;
+ case POSIX_SPAWN_PROC_TYPE_DAEMON_STANDARD:
+ apptype = TASK_APPTYPE_DAEMON_STANDARD;
break;
- case PSPA_EXCEPTION:
- ret = task_set_exception_ports(task,
- act->mask,
- port,
- act->behavior,
- act->flavor);
+ case POSIX_SPAWN_PROC_TYPE_DAEMON_ADAPTIVE:
+ apptype = TASK_APPTYPE_DAEMON_ADAPTIVE;
+ break;
+ case POSIX_SPAWN_PROC_TYPE_DAEMON_BACKGROUND:
+ apptype = TASK_APPTYPE_DAEMON_BACKGROUND;
+ break;
+ case POSIX_SPAWN_PROC_TYPE_APP_DEFAULT:
+ apptype = TASK_APPTYPE_APP_DEFAULT;
+ break;
+ case POSIX_SPAWN_PROC_TYPE_APP_TAL:
+ apptype = TASK_APPTYPE_APP_TAL;
break;
default:
- ret = KERN_FAILURE;
+ apptype = TASK_APPTYPE_NONE;
+ /* TODO: Should an invalid value here fail the spawn? */
+ break;
}
- /* action failed, so release port resources */
- if (ret) {
- ipc_port_release_send(port);
- return ret;
+ }
+
+ if (psa_qos_clamp != POSIX_SPAWN_PROC_CLAMP_NONE) {
+ switch (psa_qos_clamp) {
+ case POSIX_SPAWN_PROC_CLAMP_UTILITY:
+ qos_clamp = THREAD_QOS_UTILITY;
+ break;
+ case POSIX_SPAWN_PROC_CLAMP_BACKGROUND:
+ qos_clamp = THREAD_QOS_BACKGROUND;
+ break;
+ case POSIX_SPAWN_PROC_CLAMP_MAINTENANCE:
+ qos_clamp = THREAD_QOS_MAINTENANCE;
+ break;
+ default:
+ qos_clamp = THREAD_QOS_UNSPECIFIED;
+ /* TODO: Should an invalid value here fail the spawn? */
+ break;
}
}
- return ret;
+ if (psa_apptype != TASK_APPTYPE_NONE || qos_clamp != THREAD_QOS_UNSPECIFIED) {
+ proc_set_task_spawnpolicy(p->task, apptype, qos_clamp,
+ portwatch_ports, portwatch_count);
+ }
+
+ return (0);
}
+
/*
- * exec_handle_file_actions
+ * exec_handle_port_actions
*
- * Description: Go through the _posix_file_actions_t contents applying the
- * open, close, and dup2 operations to the open file table for
- * the current process.
+ * Description: Go through the _posix_port_actions_t contents,
+ * calling task_set_special_port, task_set_exception_ports
+ * and/or audit_session_spawnjoin for the current task.
*
* Parameters: struct image_params * Image parameter block
+ * short psa_flags posix spawn attribute flags
*
* Returns: 0 Success
- * ???
- *
- * Note: Actions are applied in the order specified, with the credential
- * of the parent process. This is done to permit the parent
+ * EINVAL Failure
+ * ENOTSUP Illegal posix_spawn attr flag was set
+ */
+static errno_t
+exec_handle_port_actions(struct image_params *imgp, short psa_flags, boolean_t * portwatch_present, ipc_port_t * portwatch_ports)
+{
+ _posix_spawn_port_actions_t pacts = imgp->ip_px_spa;
+ proc_t p = vfs_context_proc(imgp->ip_vfs_context);
+ _ps_port_action_t *act = NULL;
+ task_t task = p->task;
+ ipc_port_t port = NULL;
+ errno_t ret = 0;
+ int i;
+
+ *portwatch_present = FALSE;
+
+ for (i = 0; i < pacts->pspa_count; i++) {
+ act = &pacts->pspa_actions[i];
+
+ if (ipc_object_copyin(get_task_ipcspace(current_task()),
+ act->new_port, MACH_MSG_TYPE_COPY_SEND,
+ (ipc_object_t *) &port) != KERN_SUCCESS) {
+ ret = EINVAL;
+ goto done;
+ }
+
+ switch (act->port_type) {
+ case PSPA_SPECIAL:
+ /* Only allowed when not under vfork */
+ if (!(psa_flags & POSIX_SPAWN_SETEXEC))
+ ret = ENOTSUP;
+ else if (task_set_special_port(task,
+ act->which, port) != KERN_SUCCESS)
+ ret = EINVAL;
+ break;
+
+ case PSPA_EXCEPTION:
+ /* Only allowed when not under vfork */
+ if (!(psa_flags & POSIX_SPAWN_SETEXEC))
+ ret = ENOTSUP;
+ else if (task_set_exception_ports(task,
+ act->mask, port, act->behavior,
+ act->flavor) != KERN_SUCCESS)
+ ret = EINVAL;
+ break;
+#if CONFIG_AUDIT
+ case PSPA_AU_SESSION:
+ ret = audit_session_spawnjoin(p, port);
+ break;
+#endif
+ case PSPA_IMP_WATCHPORTS:
+ if (portwatch_ports != NULL) {
+ *portwatch_present = TRUE;
+ /* hold on to this till end of spawn */
+ portwatch_ports[i] = port;
+ ret = 0;
+ } else
+ ipc_port_release_send(port);
+ break;
+ default:
+ ret = EINVAL;
+ break;
+ }
+
+ /* action failed, so release port resources */
+
+ if (ret) {
+ ipc_port_release_send(port);
+ break;
+ }
+ }
+
+done:
+ if (0 != ret)
+ DTRACE_PROC1(spawn__port__failure, mach_port_name_t, act->new_port);
+ return (ret);
+}
+
+/*
+ * exec_handle_file_actions
+ *
+ * Description: Go through the _posix_file_actions_t contents applying the
+ * open, close, and dup2 operations to the open file table for
+ * the current process.
+ *
+ * Parameters: struct image_params * Image parameter block
+ *
+ * Returns: 0 Success
+ * ???
+ *
+ * Note: Actions are applied in the order specified, with the credential
+ * of the parent process. This is done to permit the parent
* process to utilize POSIX_SPAWN_RESETIDS to drop privilege in
* the child following operations the child may in fact not be
* normally permitted to perform.
*/
static int
-exec_handle_file_actions(struct image_params *imgp)
+exec_handle_file_actions(struct image_params *imgp, short psa_flags)
{
int error = 0;
int action;
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
_posix_spawn_file_actions_t px_sfap = imgp->ip_px_sfa;
- register_t ival[2]; /* dummy retval for system calls) */
+ int ival[2]; /* dummy retval for system calls) */
for (action = 0; action < px_sfap->psfa_act_count; action++) {
_psfa_action_t *psfa = &px_sfap->psfa_act_acts[ action];
* a path argument, which is normally copied in from
* user space; because of this, we have to support an
* open from kernel space that passes an address space
- * context oof UIO_SYSSPACE, and casts the address
+ * context of UIO_SYSSPACE, and casts the address
* argument to a user_addr_t.
*/
- struct vnode_attr va;
- struct nameidata nd;
+ char *bufp = NULL;
+ struct vnode_attr *vap;
+ struct nameidata *ndp;
int mode = psfa->psfaa_openargs.psfao_mode;
struct dup2_args dup2a;
struct close_nocancel_args ca;
int origfd;
- VATTR_INIT(&va);
+ MALLOC(bufp, char *, sizeof(*vap) + sizeof(*ndp), M_TEMP, M_WAITOK | M_ZERO);
+ if (bufp == NULL) {
+ error = ENOMEM;
+ break;
+ }
+
+ vap = (struct vnode_attr *) bufp;
+ ndp = (struct nameidata *) (bufp + sizeof(*vap));
+
+ VATTR_INIT(vap);
/* Mask off all but regular access permissions */
mode = ((mode &~ p->p_fd->fd_cmask) & ALLPERMS) & ~S_ISTXT;
- VATTR_SET(&va, va_mode, mode & ACCESSPERMS);
+ VATTR_SET(vap, va_mode, mode & ACCESSPERMS);
- NDINIT(&nd, LOOKUP, FOLLOW | AUDITVNPATH1, UIO_SYSSPACE,
+ NDINIT(ndp, LOOKUP, OP_OPEN, FOLLOW | AUDITVNPATH1, UIO_SYSSPACE,
CAST_USER_ADDR_T(psfa->psfaa_openargs.psfao_path),
imgp->ip_vfs_context);
error = open1(imgp->ip_vfs_context,
- &nd,
+ ndp,
psfa->psfaa_openargs.psfao_oflag,
- &va,
+ vap,
+ fileproc_alloc_init, NULL,
ival);
+ FREE(bufp, M_TEMP);
+
/*
* If there's an error, or we get the right fd by
- * accident, then drop out here. This is easier that
- * rearchitecting all the open code to preallocate fd
+ * accident, then drop out here. This is easier than
+ * reworking all the open code to preallocate fd
* slots, and internally taking one as an argument.
*/
if (error || ival[0] == psfa->psfaa_filedes)
}
break;
+ case PSFA_INHERIT: {
+ struct fcntl_nocancel_args fcntla;
+
+ /*
+ * Check to see if the descriptor exists, and
+ * ensure it's -not- marked as close-on-exec.
+ *
+ * Attempting to "inherit" a guarded fd will
+ * result in a error.
+ */
+ fcntla.fd = psfa->psfaa_filedes;
+ fcntla.cmd = F_GETFD;
+ if ((error = fcntl_nocancel(p, &fcntla, ival)) != 0)
+ break;
+
+ if ((ival[0] & FD_CLOEXEC) == FD_CLOEXEC) {
+ fcntla.fd = psfa->psfaa_filedes;
+ fcntla.cmd = F_SETFD;
+ fcntla.arg = ival[0] & ~FD_CLOEXEC;
+ error = fcntl_nocancel(p, &fcntla, ival);
+ }
+
+ }
+ break;
+
default:
error = EINVAL;
break;
}
+
/* All file actions failures are considered fatal, per POSIX */
- if (error)
+
+ if (error) {
+ if (PSFA_OPEN == psfa->psfaa_type) {
+ DTRACE_PROC1(spawn__open__failure, uintptr_t,
+ psfa->psfaa_openargs.psfao_path);
+ } else {
+ DTRACE_PROC1(spawn__fd__failure, int, psfa->psfaa_filedes);
+ }
break;
+ }
}
- return (error);
+ if (error != 0 || (psa_flags & POSIX_SPAWN_CLOEXEC_DEFAULT) == 0)
+ return (error);
+
+ /*
+ * If POSIX_SPAWN_CLOEXEC_DEFAULT is set, behave (during
+ * this spawn only) as if "close on exec" is the default
+ * disposition of all pre-existing file descriptors. In this case,
+ * the list of file descriptors mentioned in the file actions
+ * are the only ones that can be inherited, so mark them now.
+ *
+ * The actual closing part comes later, in fdexec().
+ */
+ proc_fdlock(p);
+ for (action = 0; action < px_sfap->psfa_act_count; action++) {
+ _psfa_action_t *psfa = &px_sfap->psfa_act_acts[action];
+ int fd = psfa->psfaa_filedes;
+
+ switch (psfa->psfaa_type) {
+ case PSFA_DUP2:
+ fd = psfa->psfaa_openargs.psfao_oflag;
+ /*FALLTHROUGH*/
+ case PSFA_OPEN:
+ case PSFA_INHERIT:
+ *fdflags(p, fd) |= UF_INHERIT;
+ break;
+
+ case PSFA_CLOSE:
+ break;
+ }
+ }
+ proc_fdunlock(p);
+
+ return (0);
+}
+
+#if CONFIG_MACF
+/*
+ * exec_spawnattr_getmacpolicyinfo
+ */
+void *
+exec_spawnattr_getmacpolicyinfo(const void *macextensions, const char *policyname, size_t *lenp)
+{
+ const struct _posix_spawn_mac_policy_extensions *psmx = macextensions;
+ int i;
+
+ if (psmx == NULL)
+ return NULL;
+
+ for (i = 0; i < psmx->psmx_count; i++) {
+ const _ps_mac_policy_extension_t *extension = &psmx->psmx_extensions[i];
+ if (strncmp(extension->policyname, policyname, sizeof(extension->policyname)) == 0) {
+ if (lenp != NULL)
+ *lenp = extension->datalen;
+ return extension->datap;
+ }
+ }
+
+ if (lenp != NULL)
+ *lenp = 0;
+ return NULL;
+}
+
+static int
+spawn_copyin_macpolicyinfo(const struct user__posix_spawn_args_desc *px_args, _posix_spawn_mac_policy_extensions_t *psmxp)
+{
+ _posix_spawn_mac_policy_extensions_t psmx = NULL;
+ int error = 0;
+ int copycnt = 0;
+ int i = 0;
+
+ *psmxp = NULL;
+
+ if (px_args->mac_extensions_size < PS_MAC_EXTENSIONS_SIZE(1) ||
+ px_args->mac_extensions_size > PAGE_SIZE) {
+ error = EINVAL;
+ goto bad;
+ }
+
+ MALLOC(psmx, _posix_spawn_mac_policy_extensions_t, px_args->mac_extensions_size, M_TEMP, M_WAITOK);
+ if ((error = copyin(px_args->mac_extensions, psmx, px_args->mac_extensions_size)) != 0)
+ goto bad;
+
+ if (PS_MAC_EXTENSIONS_SIZE(psmx->psmx_count) > px_args->mac_extensions_size) {
+ error = EINVAL;
+ goto bad;
+ }
+
+ for (i = 0; i < psmx->psmx_count; i++) {
+ _ps_mac_policy_extension_t *extension = &psmx->psmx_extensions[i];
+ if (extension->datalen == 0 || extension->datalen > PAGE_SIZE) {
+ error = EINVAL;
+ goto bad;
+ }
+ }
+
+ for (copycnt = 0; copycnt < psmx->psmx_count; copycnt++) {
+ _ps_mac_policy_extension_t *extension = &psmx->psmx_extensions[copycnt];
+ void *data = NULL;
+
+ MALLOC(data, void *, extension->datalen, M_TEMP, M_WAITOK);
+ if ((error = copyin(extension->data, data, extension->datalen)) != 0) {
+ FREE(data, M_TEMP);
+ goto bad;
+ }
+ extension->datap = data;
+ }
+
+ *psmxp = psmx;
+ return 0;
+
+bad:
+ if (psmx != NULL) {
+ for (i = 0; i < copycnt; i++)
+ FREE(psmx->psmx_extensions[i].datap, M_TEMP);
+ FREE(psmx, M_TEMP);
+ }
+ return error;
}
+static void
+spawn_free_macpolicyinfo(_posix_spawn_mac_policy_extensions_t psmx)
+{
+ int i;
+
+ if (psmx == NULL)
+ return;
+ for (i = 0; i < psmx->psmx_count; i++)
+ FREE(psmx->psmx_extensions[i].datap, M_TEMP);
+ FREE(psmx, M_TEMP);
+}
+#endif /* CONFIG_MACF */
/*
* posix_spawn
* exec_activate_image:???
* mac_execve_enter:???
*
- * TODO: More gracefully handle failures after vfork
- * Expect to need __mac_posix_spawn() at some point...
+ * TODO: Expect to need __mac_posix_spawn() at some point...
* Handle posix_spawnattr_t
* Handle posix_spawn_file_actions_t
*/
int
-posix_spawn(proc_t ap, struct posix_spawn_args *uap, register_t *retval)
+posix_spawn(proc_t ap, struct posix_spawn_args *uap, int32_t *retval)
{
proc_t p = ap; /* quiet bogus GCC vfork() warning */
user_addr_t pid = uap->pid;
- register_t ival[2]; /* dummy retval for vfork() */
- struct image_params image_params, *imgp;
- struct vnode_attr va;
- struct vnode_attr origva;
+ int ival[2]; /* dummy retval for setpgid() */
+ char *bufp = NULL;
+ struct image_params *imgp;
+ struct vnode_attr *vap;
+ struct vnode_attr *origvap;
struct uthread *uthread = 0; /* compiler complains if not set to 0*/
int error, sig;
- task_t task;
- int numthreads;
char alt_p_comm[sizeof(p->p_comm)] = {0}; /* for PowerPC */
int is_64 = IS_64BIT_PROCESS(p);
- int undo_vfork = 0;
struct vfs_context context;
struct user__posix_spawn_args_desc px_args;
struct _posix_spawnattr px_sa;
_posix_spawn_file_actions_t px_sfap = NULL;
_posix_spawn_port_actions_t px_spap = NULL;
- struct __user_sigaction vec;
+ struct __kern_sigaction vec;
+ boolean_t spawn_no_exec = FALSE;
+ boolean_t proc_transit_set = TRUE;
+ boolean_t exec_done = FALSE;
+ int portwatch_count = 0;
+ ipc_port_t * portwatch_ports = NULL;
+ vm_size_t px_sa_offset = offsetof(struct _posix_spawnattr, psa_ports);
- imgp = &image_params;
+ /*
+ * Allocate a big chunk for locals instead of using stack since these
+ * structures are pretty big.
+ */
+ MALLOC(bufp, char *, (sizeof(*imgp) + sizeof(*vap) + sizeof(*origvap)), M_TEMP, M_WAITOK | M_ZERO);
+ imgp = (struct image_params *) bufp;
+ if (bufp == NULL) {
+ error = ENOMEM;
+ goto bad;
+ }
+ vap = (struct vnode_attr *) (bufp + sizeof(*imgp));
+ origvap = (struct vnode_attr *) (bufp + sizeof(*imgp) + sizeof(*vap));
/* Initialize the common data in the image_params structure */
- bzero(imgp, sizeof(*imgp));
imgp->ip_user_fname = uap->path;
imgp->ip_user_argv = uap->argv;
imgp->ip_user_envv = uap->envp;
- imgp->ip_vattr = &va;
- imgp->ip_origvattr = &origva;
+ imgp->ip_vattr = vap;
+ imgp->ip_origvattr = origvap;
imgp->ip_vfs_context = &context;
imgp->ip_flags = (is_64 ? IMGPF_WAS_64BIT : IMGPF_NONE);
imgp->ip_p_comm = alt_p_comm; /* for PowerPC */
imgp->ip_seg = (is_64 ? UIO_USERSPACE64 : UIO_USERSPACE32);
+ imgp->ip_mac_return = 0;
if (uap->adesc != USER_ADDR_NULL) {
if(is_64) {
error = copyin(uap->adesc, &px_args, sizeof(px_args));
} else {
- struct _posix_spawn_args_desc px_args32;
+ struct user32__posix_spawn_args_desc px_args32;
error = copyin(uap->adesc, &px_args32, sizeof(px_args32));
px_args.file_actions = CAST_USER_ADDR_T(px_args32.file_actions);
px_args.port_actions_size = px_args32.port_actions_size;
px_args.port_actions = CAST_USER_ADDR_T(px_args32.port_actions);
+ px_args.mac_extensions_size = px_args32.mac_extensions_size;
+ px_args.mac_extensions = CAST_USER_ADDR_T(px_args32.mac_extensions);
}
if (error)
goto bad;
if (px_args.attr_size != 0) {
/*
- * This could lose some of the port_actions pointer,
- * but we already have it from px_args.
+ * We are not copying the port_actions pointer,
+ * because we already have it from px_args.
+ * This is a bit fragile: <rdar://problem/16427422>
*/
- if ((error = copyin(px_args.attrp, &px_sa, sizeof(px_sa))) != 0)
+
+ if ((error = copyin(px_args.attrp, &px_sa, px_sa_offset) != 0))
goto bad;
+
+ bzero( (void *)( (unsigned long) &px_sa + px_sa_offset), sizeof(px_sa) - px_sa_offset );
imgp->ip_px_sa = &px_sa;
}
if ((error = copyin(px_args.file_actions, px_sfap,
px_args.file_actions_size)) != 0)
goto bad;
+
+ /* Verify that the action count matches the struct size */
+ if (PSF_ACTIONS_SIZE(px_sfap->psfa_act_count) != px_args.file_actions_size) {
+ error = EINVAL;
+ goto bad;
+ }
}
if (px_args.port_actions_size != 0) {
/* Limit port_actions to one page of data */
if ((error = copyin(px_args.port_actions, px_spap,
px_args.port_actions_size)) != 0)
goto bad;
+
+ /* Verify that the action count matches the struct size */
+ if (PS_PORT_ACTIONS_SIZE(px_spap->pspa_count) != px_args.port_actions_size) {
+ error = EINVAL;
+ goto bad;
+ }
}
+#if CONFIG_MACF
+ if (px_args.mac_extensions_size != 0) {
+ if ((error = spawn_copyin_macpolicyinfo(&px_args, (_posix_spawn_mac_policy_extensions_t *)&imgp->ip_px_smpx)) != 0)
+ goto bad;
+ }
+#endif /* CONFIG_MACF */
+ }
+
+ /* set uthread to parent */
+ uthread = get_bsdthread_info(current_thread());
+
+ /*
+ * <rdar://6640530>; this does not result in a behaviour change
+ * relative to Leopard, so there should not be any existing code
+ * which depends on it.
+ */
+ if (uthread->uu_flag & UT_VFORK) {
+ error = EINVAL;
+ goto bad;
}
+ /*
+ * If we don't have the extension flag that turns "posix_spawn()"
+ * into "execve() with options", then we will be creating a new
+ * process which does not inherit memory from the parent process,
+ * which is one of the most expensive things about using fork()
+ * and execve().
+ */
if (imgp->ip_px_sa == NULL || !(px_sa.psa_flags & POSIX_SPAWN_SETEXEC)){
- if ((error = vfork(p, NULL, ival)) != 0)
+
+ /*
+ * Set the new task's coalition, if it is requested.
+ * TODO: privilege check - 15365900
+ */
+ coalition_t coal = COALITION_NULL;
+#if CONFIG_COALITIONS
+ if (imgp->ip_px_sa) {
+ uint64_t cid = px_sa.psa_coalitionid;
+ if (cid != 0) {
+#if COALITION_DEBUG
+ printf("%s: searching for coalition ID %llu\n", __func__, cid);
+#endif
+ coal = coalition_find_and_activate_by_id(cid);
+ if (coal == COALITION_NULL) {
+#if COALITION_DEBUG
+ printf("%s: could not find coalition ID %llu (perhaps it has been terminated or reaped)\n", __func__, cid);
+#endif
+ error = ESRCH;
+ goto bad;
+ }
+ }
+ }
+#endif /* CONFIG_COALITIONS */
+
+ error = fork1(p, &imgp->ip_new_thread, PROC_CREATE_SPAWN, coal);
+
+ if (error != 0) {
+ if (coal != COALITION_NULL) {
+#if CONFIG_COALITIONS
+ coalition_remove_active(coal);
+ coalition_release(coal);
+#endif /* CONFIG_COALITIONS */
+ }
goto bad;
- undo_vfork = 1;
+ }
+ imgp->ip_flags |= IMGPF_SPAWN; /* spawn w/o exec */
+ spawn_no_exec = TRUE; /* used in later tests */
+
+ if (coal != COALITION_NULL) {
+#if CONFIG_COALITIONS
+ coalition_remove_active(coal);
+ coalition_release(coal);
+#endif /* CONFIG_COALITIONS */
+ }
}
- /* "reenter the kernel" on a new vfork()'ed process */
- uthread = get_bsdthread_info(current_thread());
- if (undo_vfork)
- p = uthread->uu_proc;
+ if (spawn_no_exec) {
+ p = (proc_t)get_bsdthreadtask_info(imgp->ip_new_thread);
+
+ /*
+ * We had to wait until this point before firing the
+ * proc:::create probe, otherwise p would not point to the
+ * child process.
+ */
+ DTRACE_PROC1(create, proc_t, p);
+ }
+ assert(p != NULL);
+ /* By default, the thread everyone plays with is the parent */
context.vc_thread = current_thread();
context.vc_ucred = p->p_ucred; /* XXX must NOT be kauth_cred_get() */
+ /*
+ * However, if we're not in the setexec case, redirect the context
+ * to the newly created process instead
+ */
+ if (spawn_no_exec)
+ context.vc_thread = imgp->ip_new_thread;
+
/*
* Post fdcopy(), pre exec_handle_sugid() - this is where we want
* to handle the file_actions. Since vfork() also ends up setting
* us into the parent process group, and saved off the signal flags,
* this is also where we want to handle the spawn flags.
*/
+
/* Has spawn file actions? */
- if (imgp->ip_px_sfa != NULL &&
- (error = exec_handle_file_actions(imgp)) != 0) {
- goto bad;
+ if (imgp->ip_px_sfa != NULL) {
+ /*
+ * The POSIX_SPAWN_CLOEXEC_DEFAULT flag
+ * is handled in exec_handle_file_actions().
+ */
+ if ((error = exec_handle_file_actions(imgp,
+ imgp->ip_px_sa != NULL ? px_sa.psa_flags : 0)) != 0)
+ goto bad;
}
/* Has spawn port actions? */
- if (imgp->ip_px_spa != NULL) {
- /* Only allowed when not under vfork */
- if (!(px_sa.psa_flags & POSIX_SPAWN_SETEXEC)) {
- error = ENOTSUP;
- goto bad;
+ if (imgp->ip_px_spa != NULL) {
+ boolean_t is_adaptive = FALSE;
+ boolean_t portwatch_present = FALSE;
+
+ /* Will this process become adaptive? The apptype isn't ready yet, so we can't look there. */
+ if (imgp->ip_px_sa != NULL && px_sa.psa_apptype == POSIX_SPAWN_PROC_TYPE_DAEMON_ADAPTIVE)
+ is_adaptive = TRUE;
+
+ /*
+ * portwatch only:
+ * Allocate a place to store the ports we want to bind to the new task
+ * We can't bind them until after the apptype is set.
+ */
+ if (px_spap->pspa_count != 0 && is_adaptive) {
+ portwatch_count = px_spap->pspa_count;
+ MALLOC(portwatch_ports, ipc_port_t *, (sizeof(ipc_port_t) * portwatch_count), M_TEMP, M_WAITOK | M_ZERO);
+ } else {
+ portwatch_ports = NULL;
}
- if((error = exec_handle_port_actions(imgp)) != 0)
+
+ if ((error = exec_handle_port_actions(imgp,
+ imgp->ip_px_sa != NULL ? px_sa.psa_flags : 0, &portwatch_present, portwatch_ports)) != 0)
goto bad;
+
+ if (portwatch_present == FALSE && portwatch_ports != NULL) {
+ FREE(portwatch_ports, M_TEMP);
+ portwatch_ports = NULL;
+ portwatch_count = 0;
+ }
}
/* Has spawn attr? */
if (imgp->ip_px_sa != NULL) {
- /* Set the process group ID of the child process */
+ /*
+ * Set the process group ID of the child process; this has
+ * to happen before the image activation.
+ */
if (px_sa.psa_flags & POSIX_SPAWN_SETPGROUP) {
struct setpgid_args spga;
spga.pid = p->p_pid;
if((error = setpgid(p, &spga, ival)) != 0)
goto bad;
}
+
/*
* Reset UID/GID to parent's RUID/RGID; This works only
* because the operation occurs *after* the vfork() and
* before the call to exec_handle_sugid() by the image
- * activator called from exec_activate_image().
+ * activator called from exec_activate_image(). POSIX
+ * requires that any setuid/setgid bits on the process
+ * image will take precedence over the spawn attributes
+ * (re)setting them.
*
* The use of p_ucred is safe, since we are acting on the
* new process, and it has no threads other than the one
*/
if (px_sa.psa_flags & POSIX_SPAWN_RESETIDS) {
kauth_cred_t my_cred = p->p_ucred;
- kauth_cred_t my_new_cred = kauth_cred_setuidgid(my_cred, my_cred->cr_ruid, my_cred->cr_rgid);
- if (my_new_cred != my_cred)
+ kauth_cred_t my_new_cred = kauth_cred_setuidgid(my_cred, kauth_cred_getruid(my_cred), kauth_cred_getrgid(my_cred));
+ if (my_new_cred != my_cred) {
p->p_ucred = my_new_cred;
+ /* update cred on proc */
+ PROC_UPDATE_CREDS_ONPROC(p);
+ }
}
+
+ /*
+ * Disable ASLR for the spawned process.
+ */
+ /*
+ * But only do so if we are not embedded; embedded allows for a
+ * boot-arg (-disable_aslr) to deal with this (which itself is
+ * only honored on DEVELOPMENT or DEBUG builds of xnu).
+ */
+ if (px_sa.psa_flags & _POSIX_SPAWN_DISABLE_ASLR)
+ OSBitOrAtomic(P_DISABLE_ASLR, &p->p_flag);
+
+ /*
+ * Forcibly disallow execution from data pages for the spawned process
+ * even if it would otherwise be permitted by the architecture default.
+ */
+ if (px_sa.psa_flags & _POSIX_SPAWN_ALLOW_DATA_EXEC)
+ imgp->ip_flags |= IMGPF_ALLOW_DATA_EXEC;
+ }
+
+ /*
+ * Disable ASLR during image activation. This occurs either if the
+ * _POSIX_SPAWN_DISABLE_ASLR attribute was found above or if
+ * P_DISABLE_ASLR was inherited from the parent process.
+ */
+ if (p->p_flag & P_DISABLE_ASLR)
+ imgp->ip_flags |= IMGPF_DISABLE_ASLR;
+
+ /*
+ * Clear transition flag so we won't hang if exec_activate_image() causes
+ * an automount (and launchd does a proc sysctl to service it).
+ *
+ * <rdar://problem/6848672>, <rdar://problem/5959568>.
+ */
+ if (spawn_no_exec) {
+ proc_transend(p, 0);
+ proc_transit_set = 0;
+ }
+
+#if MAC_SPAWN /* XXX */
+ if (uap->mac_p != USER_ADDR_NULL) {
+ error = mac_execve_enter(uap->mac_p, imgp);
+ if (error)
+ goto bad;
+ }
+#endif
+
+ /*
+ * Activate the image
+ */
+ error = exec_activate_image(imgp);
+
+ if (error == 0) {
+ /* process completed the exec */
+ exec_done = TRUE;
+ } else if (error == -1) {
+ /* Image not claimed by any activator? */
+ error = ENOEXEC;
+ }
+
+ /*
+ * If we have a spawn attr, and it contains signal related flags,
+ * the we need to process them in the "context" of the new child
+ * process, so we have to process it following image activation,
+ * prior to making the thread runnable in user space. This is
+ * necessitated by some signal information being per-thread rather
+ * than per-process, and we don't have the new allocation in hand
+ * until after the image is activated.
+ */
+ if (!error && imgp->ip_px_sa != NULL) {
+ thread_t child_thread = current_thread();
+ uthread_t child_uthread = uthread;
+
+ /*
+ * If we created a new child thread, then the thread and
+ * uthread are different than the current ones; otherwise,
+ * we leave them, since we are in the exec case instead.
+ */
+ if (spawn_no_exec) {
+ child_thread = imgp->ip_new_thread;
+ child_uthread = get_bsdthread_info(child_thread);
+ }
+
/*
* Mask a list of signals, instead of them being unmasked, if
* they were unmasked in the parent; note that some signals
* are not maskable.
*/
if (px_sa.psa_flags & POSIX_SPAWN_SETSIGMASK)
- uthread->uu_sigmask = (px_sa.psa_sigmask & ~sigcantmask);
+ child_uthread->uu_sigmask = (px_sa.psa_sigmask & ~sigcantmask);
/*
* Default a list of signals instead of ignoring them, if
- * they were ignored in the parent.
+ * they were ignored in the parent. Note that we pass
+ * spawn_no_exec to setsigvec() to indicate that we called
+ * fork1() and therefore do not need to call proc_signalstart()
+ * internally.
*/
if (px_sa.psa_flags & POSIX_SPAWN_SETSIGDEF) {
vec.sa_handler = SIG_DFL;
vec.sa_mask = 0;
vec.sa_flags = 0;
for (sig = 0; sig < NSIG; sig++)
- if (px_sa.psa_sigdefault && 1 << sig) {
- error = setsigvec(p, sig, &vec);
+ if (px_sa.psa_sigdefault & (1 << sig)) {
+ error = setsigvec(p, child_thread, sig + 1, &vec, spawn_no_exec);
}
}
+
+ /*
+ * Activate the CPU usage monitor, if requested. This is done via a task-wide, per-thread CPU
+ * usage limit, which will generate a resource exceeded exception if any one thread exceeds the
+ * limit.
+ *
+ * Userland gives us interval in seconds, and the kernel SPI expects nanoseconds.
+ */
+ if (px_sa.psa_cpumonitor_percent != 0) {
+ /*
+ * Always treat a CPU monitor activation coming from spawn as entitled. Requiring
+ * an entitlement to configure the monitor a certain way seems silly, since
+ * whomever is turning it on could just as easily choose not to do so.
+ *
+ * XXX - Ignore the parameters that we get from userland. The spawnattr method of
+ * activating the monitor always gets the system default parameters. Once we have
+ * an explicit spawn SPI for configuring the defaults, we can revert this to
+ * respect the params passed in from userland.
+ */
+ error = proc_set_task_ruse_cpu(p->task,
+ TASK_POLICY_RESOURCE_ATTRIBUTE_NOTIFY_EXC,
+ PROC_POLICY_CPUMON_DEFAULTS, 0,
+ 0, TRUE);
+ }
+ }
+
+bad:
+
+ if (error == 0) {
+ /* reset delay idle sleep status if set */
+ if ((p->p_flag & P_DELAYIDLESLEEP) == P_DELAYIDLESLEEP)
+ OSBitAndAtomic(~((uint32_t)P_DELAYIDLESLEEP), &p->p_flag);
+ /* upon successful spawn, re/set the proc control state */
+ if (imgp->ip_px_sa != NULL) {
+ switch (px_sa.psa_pcontrol) {
+ case POSIX_SPAWN_PCONTROL_THROTTLE:
+ p->p_pcaction = P_PCTHROTTLE;
+ break;
+ case POSIX_SPAWN_PCONTROL_SUSPEND:
+ p->p_pcaction = P_PCSUSP;
+ break;
+ case POSIX_SPAWN_PCONTROL_KILL:
+ p->p_pcaction = P_PCKILL;
+ break;
+ case POSIX_SPAWN_PCONTROL_NONE:
+ default:
+ p->p_pcaction = 0;
+ break;
+ };
+ }
+ exec_resettextvp(p, imgp);
+
+#if CONFIG_MEMORYSTATUS && CONFIG_JETSAM
+ /* Has jetsam attributes? */
+ if (imgp->ip_px_sa != NULL && (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_SET)) {
+ memorystatus_update(p, px_sa.psa_priority, 0, (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_USE_EFFECTIVE_PRIORITY),
+ TRUE, px_sa.psa_high_water_mark, (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND),
+ (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_MEMLIMIT_FATAL));
+ }
+#endif
}
/*
- * XXXAUDIT: Currently, we only audit the pathname of the binary.
- * There may also be poor interaction with dyld.
- */
+ * If we successfully called fork1(), we always need to do this;
+ * we identify this case by noting the IMGPF_SPAWN flag. This is
+ * because we come back from that call with signals blocked in the
+ * child, and we have to unblock them, but we want to wait until
+ * after we've performed any spawn actions. This has to happen
+ * before check_for_signature(), which uses psignal.
+ */
+ if (spawn_no_exec) {
+ if (proc_transit_set)
+ proc_transend(p, 0);
- task = current_task();
+ /*
+ * Drop the signal lock on the child which was taken on our
+ * behalf by forkproc()/cloneproc() to prevent signals being
+ * received by the child in a partially constructed state.
+ */
+ proc_signalend(p, 0);
+
+ /* flag the 'fork' has occurred */
+ proc_knote(p->p_pptr, NOTE_FORK | p->p_pid);
+ /* then flag exec has occurred */
+ /* notify only if it has not failed due to FP Key error */
+ if ((p->p_lflag & P_LTERM_DECRYPTFAIL) == 0)
+ proc_knote(p, NOTE_EXEC);
+ } else {
+ /* reset the importance attribute from our previous life */
+ task_importance_reset(p->task);
- /* If we're not in vfork, don't permit a mutithreaded task to exec */
- if (!(uthread->uu_flag & UT_VFORK)) {
- if (task != kernel_task) {
- numthreads = get_task_numacts(task);
- if (numthreads <= 0 ) {
- error = EINVAL;
- goto bad;
- }
- if (numthreads > 1) {
- error = ENOTSUP;
- goto bad;
+ /* reset atm context from task */
+ task_atm_reset(p->task);
+ }
+
+ /*
+ * Apply the spawnattr policy, apptype (which primes the task for importance donation),
+ * and bind any portwatch ports to the new task.
+ * This must be done after the exec so that the child's thread is ready,
+ * and after the in transit state has been released, because priority is
+ * dropped here so we need to be prepared for a potentially long preemption interval
+ *
+ * TODO: Consider splitting this up into separate phases
+ */
+ if (error == 0 && imgp->ip_px_sa != NULL) {
+ struct _posix_spawnattr *psa = (struct _posix_spawnattr *) imgp->ip_px_sa;
+
+ exec_handle_spawnattr_policy(p, psa->psa_apptype, psa->psa_qos_clamp,
+ portwatch_ports, portwatch_count);
+ }
+
+ /* Apply the main thread qos */
+ if (error == 0) {
+ thread_t main_thread = (imgp->ip_new_thread != NULL) ? imgp->ip_new_thread : current_thread();
+
+ task_set_main_thread_qos(p->task, main_thread);
+ }
+
+ /*
+ * Release any ports we kept around for binding to the new task
+ * We need to release the rights even if the posix_spawn has failed.
+ */
+ if (portwatch_ports != NULL) {
+ for (int i = 0; i < portwatch_count; i++) {
+ ipc_port_t port = NULL;
+ if ((port = portwatch_ports[i]) != NULL) {
+ ipc_port_release_send(port);
}
}
+ FREE(portwatch_ports, M_TEMP);
+ portwatch_ports = NULL;
+ portwatch_count = 0;
}
-#if MAC_SPAWN /* XXX */
- if (uap->mac_p != USER_ADDR_NULL) {
- error = mac_execve_enter(uap->mac_p, imgp);
- if (error)
- goto bad;
+ /*
+ * We have to delay operations which might throw a signal until after
+ * the signals have been unblocked; however, we want that to happen
+ * after exec_resettextvp() so that the textvp is correct when they
+ * fire.
+ */
+ if (error == 0) {
+ error = check_for_signature(p, imgp);
+
+ /*
+ * Pay for our earlier safety; deliver the delayed signals from
+ * the incomplete spawn process now that it's complete.
+ */
+ if (imgp != NULL && spawn_no_exec && (p->p_lflag & P_LTRACED)) {
+ psignal_vfork(p, p->task, imgp->ip_new_thread, SIGTRAP);
+ }
}
-#endif
- if ((error = exec_activate_image(imgp)) != 0)
- goto bad;
-bad:
- /* Image not claimed by any activator? */
- if (error == -1)
- error = ENOEXEC;
- if (error == 0) {
- exec_resettextvp(p, imgp);
- }
- if (imgp->ip_vp)
- vnode_put(imgp->ip_vp);
- if (imgp->ip_strings)
- execargs_free(imgp);
- if (imgp->ip_px_sfa != NULL)
- FREE(imgp->ip_px_sfa, M_TEMP);
- if (imgp->ip_px_spa != NULL)
- FREE(imgp->ip_px_spa, M_TEMP);
+ if (imgp != NULL) {
+ if (imgp->ip_vp)
+ vnode_put(imgp->ip_vp);
+ if (imgp->ip_scriptvp)
+ vnode_put(imgp->ip_scriptvp);
+ if (imgp->ip_strings)
+ execargs_free(imgp);
+ if (imgp->ip_px_sfa != NULL)
+ FREE(imgp->ip_px_sfa, M_TEMP);
+ if (imgp->ip_px_spa != NULL)
+ FREE(imgp->ip_px_spa, M_TEMP);
+
#if CONFIG_MACF
- if (imgp->ip_execlabelp)
- mac_cred_label_free(imgp->ip_execlabelp);
- if (imgp->ip_scriptlabelp)
- mac_vnode_label_free(imgp->ip_scriptlabelp);
+ if (imgp->ip_px_smpx != NULL)
+ spawn_free_macpolicyinfo(imgp->ip_px_smpx);
+ if (imgp->ip_execlabelp)
+ mac_cred_label_free(imgp->ip_execlabelp);
+ if (imgp->ip_scriptlabelp)
+ mac_vnode_label_free(imgp->ip_scriptlabelp);
#endif
- if (undo_vfork) {
+ }
+
+#if CONFIG_DTRACE
+ if (spawn_no_exec) {
+ /*
+ * In the original DTrace reference implementation,
+ * posix_spawn() was a libc routine that just
+ * did vfork(2) then exec(2). Thus the proc::: probes
+ * are very fork/exec oriented. The details of this
+ * in-kernel implementation of posix_spawn() is different
+ * (while producing the same process-observable effects)
+ * particularly w.r.t. errors, and which thread/process
+ * is constructing what on behalf of whom.
+ */
+ if (error) {
+ DTRACE_PROC1(spawn__failure, int, error);
+ } else {
+ DTRACE_PROC(spawn__success);
+ /*
+ * Some DTrace scripts, e.g. newproc.d in
+ * /usr/bin, rely on the the 'exec-success'
+ * probe being fired in the child after the
+ * new process image has been constructed
+ * in order to determine the associated pid.
+ *
+ * So, even though the parent built the image
+ * here, for compatibility, mark the new thread
+ * so 'exec-success' fires on it as it leaves
+ * the kernel.
+ */
+ dtrace_thread_didexec(imgp->ip_new_thread);
+ }
+ } else {
if (error) {
DTRACE_PROC1(exec__failure, int, error);
- vfork_exit(p, W_EXITCODE(-1, 0));
} else {
DTRACE_PROC(exec__success);
}
+ }
+
+ if ((dtrace_proc_waitfor_hook = dtrace_proc_waitfor_exec_ptr) != NULL)
+ (*dtrace_proc_waitfor_hook)(p);
+#endif
+
+ /* Return to both the parent and the child? */
+ if (imgp != NULL && spawn_no_exec) {
/*
- * Returning to the parent process...
- *
* If the parent wants the pid, copy it out
*/
if (pid != USER_ADDR_NULL)
(void)suword(pid, p->p_pid);
retval[0] = error;
- /*
- * Override inherited code signing flags with the
- * ones for the process that is being successfully
- * loaded
- */
- proc_lock(p);
- p->p_csflags = imgp->ip_csflags;
- proc_unlock(p);
- vfork_return(p, NULL, error);
- (void)thread_resume(imgp->ip_vfork_thread);
- }
- if (!error) {
/*
- * Override inherited code signing flags with the
- * ones for the process that is being successfully
- * loaded
+ * If we had an error, perform an internal reap ; this is
+ * entirely safe, as we have a real process backing us.
*/
- proc_lock(p);
- p->p_csflags = imgp->ip_csflags;
- proc_unlock(p);
- DTRACE_PROC(exec__success);
- } else {
- DTRACE_PROC1(exec__failure, int, error);
- }
+ if (error) {
+ proc_list_lock();
+ p->p_listflag |= P_LIST_DEADPARENT;
+ proc_list_unlock();
+ proc_lock(p);
+ /* make sure no one else has killed it off... */
+ if (p->p_stat != SZOMB && p->exit_thread == NULL) {
+ p->exit_thread = current_thread();
+ proc_unlock(p);
+ exit1(p, 1, (int *)NULL);
+ if (exec_done == FALSE) {
+ task_deallocate(get_threadtask(imgp->ip_new_thread));
+ thread_deallocate(imgp->ip_new_thread);
+ }
+ } else {
+ /* someone is doing it for us; just skip it */
+ proc_unlock(p);
+ }
+ } else {
+ /*
+ * Return to the child
+ *
+ * Note: the image activator earlier dropped the
+ * task/thread references to the newly spawned
+ * process; this is OK, since we still have suspended
+ * queue references on them, so we should be fine
+ * with the delayed resume of the thread here.
+ */
+ (void)thread_resume(imgp->ip_new_thread);
+ }
+ }
+ if (bufp != NULL) {
+ FREE(bufp, M_TEMP);
+ }
+
return(error);
}
*/
/* ARGSUSED */
int
-execve(proc_t p, struct execve_args *uap, register_t *retval)
+execve(proc_t p, struct execve_args *uap, int32_t *retval)
{
struct __mac_execve_args muap;
int err;
+ memoryshot(VM_EXECVE, DBG_FUNC_NONE);
+
muap.fname = uap->fname;
muap.argp = uap->argp;
muap.envp = uap->envp;
* TODO: Dynamic linker header address on stack is copied via suword()
*/
int
-__mac_execve(proc_t p, struct __mac_execve_args *uap, register_t *retval)
+__mac_execve(proc_t p, struct __mac_execve_args *uap, int32_t *retval)
{
- struct image_params image_params, *imgp;
- struct vnode_attr va;
- struct vnode_attr origva;
- struct uthread *uthread;
+ char *bufp = NULL;
+ struct image_params *imgp;
+ struct vnode_attr *vap;
+ struct vnode_attr *origvap;
int error;
- task_t task;
- int numthreads;
char alt_p_comm[sizeof(p->p_comm)] = {0}; /* for PowerPC */
int is_64 = IS_64BIT_PROCESS(p);
struct vfs_context context;
+ struct uthread *uthread;
context.vc_thread = current_thread();
context.vc_ucred = kauth_cred_proc_ref(p); /* XXX must NOT be kauth_cred_get() */
- imgp = &image_params;
-
+ /* Allocate a big chunk for locals instead of using stack since these
+ * structures a pretty big.
+ */
+ MALLOC(bufp, char *, (sizeof(*imgp) + sizeof(*vap) + sizeof(*origvap)), M_TEMP, M_WAITOK | M_ZERO);
+ imgp = (struct image_params *) bufp;
+ if (bufp == NULL) {
+ error = ENOMEM;
+ goto exit_with_error;
+ }
+ vap = (struct vnode_attr *) (bufp + sizeof(*imgp));
+ origvap = (struct vnode_attr *) (bufp + sizeof(*imgp) + sizeof(*vap));
+
/* Initialize the common data in the image_params structure */
- bzero(imgp, sizeof(*imgp));
imgp->ip_user_fname = uap->fname;
imgp->ip_user_argv = uap->argp;
imgp->ip_user_envv = uap->envp;
- imgp->ip_vattr = &va;
- imgp->ip_origvattr = &origva;
+ imgp->ip_vattr = vap;
+ imgp->ip_origvattr = origvap;
imgp->ip_vfs_context = &context;
- imgp->ip_flags = (is_64 ? IMGPF_WAS_64BIT : IMGPF_NONE);
+ imgp->ip_flags = (is_64 ? IMGPF_WAS_64BIT : IMGPF_NONE) | ((p->p_flag & P_DISABLE_ASLR) ? IMGPF_DISABLE_ASLR : IMGPF_NONE);
imgp->ip_p_comm = alt_p_comm; /* for PowerPC */
imgp->ip_seg = (is_64 ? UIO_USERSPACE64 : UIO_USERSPACE32);
+ imgp->ip_mac_return = 0;
- /*
- * XXXAUDIT: Currently, we only audit the pathname of the binary.
- * There may also be poor interaction with dyld.
- */
-
- task = current_task();
uthread = get_bsdthread_info(current_thread());
-
- /* If we're not in vfork, don't permit a mutithreaded task to exec */
- if (!(uthread->uu_flag & UT_VFORK)) {
- if (task != kernel_task) {
- proc_lock(p);
- numthreads = get_task_numactivethreads(task);
- if (numthreads <= 0 ) {
- proc_unlock(p);
- kauth_cred_unref(&context.vc_ucred);
- return(EINVAL);
- }
- if (numthreads > 1) {
- proc_unlock(p);
- kauth_cred_unref(&context.vc_ucred);
- return(ENOTSUP);
- }
- proc_unlock(p);
- }
+ if (uthread->uu_flag & UT_VFORK) {
+ imgp->ip_flags |= IMGPF_VFORK_EXEC;
}
#if CONFIG_MACF
error = mac_execve_enter(uap->mac_p, imgp);
if (error) {
kauth_cred_unref(&context.vc_ucred);
- return (error);
+ goto exit_with_error;
}
}
#endif
if (error == 0) {
exec_resettextvp(p, imgp);
+ error = check_for_signature(p, imgp);
}
if (imgp->ip_vp != NULLVP)
vnode_put(imgp->ip_vp);
+ if (imgp->ip_scriptvp != NULLVP)
+ vnode_put(imgp->ip_scriptvp);
if (imgp->ip_strings)
execargs_free(imgp);
#if CONFIG_MACF
mac_vnode_label_free(imgp->ip_scriptlabelp);
#endif
if (!error) {
- /*
- * Override inherited code signing flags with the
- * ones for the process that is being successfully
- * loaded
- */
- proc_lock(p);
- p->p_csflags = imgp->ip_csflags;
- proc_unlock(p);
+ /* Sever any extant thread affinity */
+ thread_affinity_exec(current_thread());
+
+ thread_t main_thread = (imgp->ip_new_thread != NULL) ? imgp->ip_new_thread : current_thread();
+
+ task_set_main_thread_qos(p->task, main_thread);
+
+ /* reset task importance */
+ task_importance_reset(p->task);
+
+ /* reset atm context from task */
+ task_atm_reset(p->task);
+
DTRACE_PROC(exec__success);
- if (uthread->uu_flag & UT_VFORK) {
+#if CONFIG_DTRACE
+ if ((dtrace_proc_waitfor_hook = dtrace_proc_waitfor_exec_ptr) != NULL)
+ (*dtrace_proc_waitfor_hook)(p);
+#endif
+
+ if (imgp->ip_flags & IMGPF_VFORK_EXEC) {
vfork_return(p, retval, p->p_pid);
- (void)thread_resume(imgp->ip_vfork_thread);
+ (void)thread_resume(imgp->ip_new_thread);
}
} else {
DTRACE_PROC1(exec__failure, int, error);
}
+
+exit_with_error:
+ if (bufp != NULL) {
+ FREE(bufp, M_TEMP);
+ }
return(error);
}
* Returns: 0 Success
* EFAULT Bad 'ua'
*
- * Implicit returns:
- * *ptr_size Modified
*/
static int
copyoutptr(user_addr_t ua, user_addr_t ptr, int ptr_size)
if (ptr_size == 4) {
/* 64 bit value containing 32 bit address */
- unsigned int i = CAST_DOWN(unsigned int,ua); /* SAFE */
+ unsigned int i = CAST_DOWN_EXPLICIT(unsigned int,ua); /* SAFE */
error = copyout(&i, ptr, 4);
} else {
* Note: The strings segment layout is backward, from the beginning
* of the top of the stack to consume the minimal amount of
* space possible; the returned stack pointer points to the
- * end of the area consumed (stacks grow upward).
+ * end of the area consumed (stacks grow downward).
*
* argc is an int; arg[i] are pointers; env[i] are pointers;
- * exec_path is a pointer; the 0's are (void *)NULL's
+ * the 0's are (void *)NULL's
*
* The stack frame layout is:
*
- * +-------------+
- * sp-> | argc |
- * +-------------+
- * | arg[0] |
- * +-------------+
- * :
- * :
- * +-------------+
- * | arg[argc-1] |
- * +-------------+
- * | 0 |
- * +-------------+
- * | env[0] |
- * +-------------+
- * :
- * :
- * +-------------+
- * | env[n] |
- * +-------------+
- * | 0 |
- * +-------------+
- * | exec_path | In MacOS X PR2 Beaker2E the path passed to exec() is
- * +-------------+ passed on the stack just after the trailing 0 of the
- * | 0 | the envp[] array as a pointer to a string.
- * +-------------+
- * | PATH AREA |
- * +-------------+
- * | STRING AREA |
- * :
- * :
- * | | <- p->user_stack
- * +-------------+
+ * +-------------+ <- p->user_stack
+ * | 16b |
+ * +-------------+
+ * | STRING AREA |
+ * | : |
+ * | : |
+ * | : |
+ * +- -- -- -- --+
+ * | PATH AREA |
+ * +-------------+
+ * | 0 |
+ * +-------------+
+ * | applev[n] |
+ * +-------------+
+ * :
+ * :
+ * +-------------+
+ * | applev[1] |
+ * +-------------+
+ * | exec_path / |
+ * | applev[0] |
+ * +-------------+
+ * | 0 |
+ * +-------------+
+ * | env[n] |
+ * +-------------+
+ * :
+ * :
+ * +-------------+
+ * | env[0] |
+ * +-------------+
+ * | 0 |
+ * +-------------+
+ * | arg[argc-1] |
+ * +-------------+
+ * :
+ * :
+ * +-------------+
+ * | arg[0] |
+ * +-------------+
+ * | argc |
+ * sp-> +-------------+
*
* Although technically a part of the STRING AREA, we treat the PATH AREA as
* a separate entity. This allows us to align the beginning of the PATH AREA
* to a pointer boundary so that the exec_path, env[i], and argv[i] pointers
* which preceed it on the stack are properly aligned.
- *
- * TODO: argc copied with suword(), which takes a 64 bit address
*/
+
static int
exec_copyout_strings(struct image_params *imgp, user_addr_t *stackp)
{
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
int ptr_size = (imgp->ip_flags & IMGPF_IS_64BIT) ? 8 : 4;
- char *argv = imgp->ip_argv; /* modifiable copy of argv */
+ int ptr_area_size;
+ void *ptr_buffer_start, *ptr_buffer;
+ int string_size;
+
user_addr_t string_area; /* *argv[], *env[] */
- user_addr_t path_area; /* package launch path */
- user_addr_t ptr_area; /* argv[], env[], exec_path */
+ user_addr_t ptr_area; /* argv[], env[], applev[] */
+ user_addr_t argc_area; /* argc */
user_addr_t stack;
- int stringc = imgp->ip_argc + imgp->ip_envc;
- int len;
int error;
- int strspace;
+
+ unsigned i;
+ struct copyout_desc {
+ char *start_string;
+ int count;
+#if CONFIG_DTRACE
+ user_addr_t *dtrace_cookie;
+#endif
+ boolean_t null_term;
+ } descriptors[] = {
+ {
+ .start_string = imgp->ip_startargv,
+ .count = imgp->ip_argc,
+#if CONFIG_DTRACE
+ .dtrace_cookie = &p->p_dtrace_argv,
+#endif
+ .null_term = TRUE
+ },
+ {
+ .start_string = imgp->ip_endargv,
+ .count = imgp->ip_envc,
+#if CONFIG_DTRACE
+ .dtrace_cookie = &p->p_dtrace_envp,
+#endif
+ .null_term = TRUE
+ },
+ {
+ .start_string = imgp->ip_strings,
+ .count = 1,
+#if CONFIG_DTRACE
+ .dtrace_cookie = NULL,
+#endif
+ .null_term = FALSE
+ },
+ {
+ .start_string = imgp->ip_endenvv,
+ .count = imgp->ip_applec - 1, /* exec_path handled above */
+#if CONFIG_DTRACE
+ .dtrace_cookie = NULL,
+#endif
+ .null_term = TRUE
+ }
+ };
stack = *stackp;
- unsigned patharea_len = imgp->ip_argv - imgp->ip_strings;
- int envc_add = 0;
-
/*
- * Set up pointers to the beginning of the string area, the beginning
- * of the path area, and the beginning of the pointer area (actually,
- * the location of argc, an int, which may be smaller than a pointer,
- * but we use ptr_size worth of space for it, for alignment).
+ * All previous contributors to the string area
+ * should have aligned their sub-area
*/
- string_area = stack - (((imgp->ip_strendp - imgp->ip_strings) + ptr_size-1) & ~(ptr_size-1)) - ptr_size;
- path_area = string_area - ((patharea_len + ptr_size-1) & ~(ptr_size-1));
- ptr_area = path_area - ((imgp->ip_argc + imgp->ip_envc + 4 + envc_add) * ptr_size) - ptr_size /*argc*/;
+ if (imgp->ip_strspace % ptr_size != 0) {
+ error = EINVAL;
+ goto bad;
+ }
- /* Return the initial stack address: the location of argc */
- *stackp = ptr_area;
+ /* Grow the stack down for the strings we've been building up */
+ string_size = imgp->ip_strendp - imgp->ip_strings;
+ stack -= string_size;
+ string_area = stack;
+
+ /*
+ * Need room for one pointer for each string, plus
+ * one for the NULLs terminating the argv, envv, and apple areas.
+ */
+ ptr_area_size = (imgp->ip_argc + imgp->ip_envc + imgp->ip_applec + 3) *
+ ptr_size;
+ stack -= ptr_area_size;
+ ptr_area = stack;
+
+ /* We'll construct all the pointer arrays in our string buffer,
+ * which we already know is aligned properly, and ip_argspace
+ * was used to verify we have enough space.
+ */
+ ptr_buffer_start = ptr_buffer = (void *)imgp->ip_strendp;
+
+ /*
+ * Need room for pointer-aligned argc slot.
+ */
+ stack -= ptr_size;
+ argc_area = stack;
/*
* Record the size of the arguments area so that sysctl_procargs()
*/
proc_lock(p);
p->p_argc = imgp->ip_argc;
- p->p_argslen = (int)(stack - path_area);
+ p->p_argslen = (int)(*stackp - string_area);
proc_unlock(p);
+ /* Return the initial stack address: the location of argc */
+ *stackp = stack;
/*
- * Support for new app package launching for Mac OS X allocates
- * the "path" at the begining of the imgp->ip_strings buffer.
- * copy it just before the string area.
+ * Copy out the entire strings area.
*/
- len = 0;
- error = copyoutstr(imgp->ip_strings, path_area,
- patharea_len,
- (size_t *)&len);
+ error = copyout(imgp->ip_strings, string_area,
+ string_size);
if (error)
goto bad;
+ for (i = 0; i < sizeof(descriptors)/sizeof(descriptors[0]); i++) {
+ char *cur_string = descriptors[i].start_string;
+ int j;
- /* Save a NULL pointer below it */
- (void)copyoutptr(0LL, path_area - ptr_size, ptr_size);
-
- /* Save the pointer to "path" just below it */
- (void)copyoutptr(path_area, path_area - 2*ptr_size, ptr_size);
+#if CONFIG_DTRACE
+ if (descriptors[i].dtrace_cookie) {
+ proc_lock(p);
+ *descriptors[i].dtrace_cookie = ptr_area + ((uintptr_t)ptr_buffer - (uintptr_t)ptr_buffer_start); /* dtrace convenience */
+ proc_unlock(p);
+ }
+#endif /* CONFIG_DTRACE */
- /*
- * ptr_size for 2 NULL one each ofter arg[argc -1] and env[n]
- * ptr_size for argc
- * skip over saved path, ptr_size for pointer to path,
- * and ptr_size for the NULL after pointer to path.
- */
+ /*
+ * For each segment (argv, envv, applev), copy as many pointers as requested
+ * to our pointer buffer.
+ */
+ for (j = 0; j < descriptors[i].count; j++) {
+ user_addr_t cur_address = string_area + (cur_string - imgp->ip_strings);
+
+ /* Copy out the pointer to the current string. Alignment has been verified */
+ if (ptr_size == 8) {
+ *(uint64_t *)ptr_buffer = (uint64_t)cur_address;
+ } else {
+ *(uint32_t *)ptr_buffer = (uint32_t)cur_address;
+ }
+
+ ptr_buffer = (void *)((uintptr_t)ptr_buffer + ptr_size);
+ cur_string += strlen(cur_string) + 1; /* Only a NUL between strings in the same area */
+ }
- /* argc (int32, stored in a ptr_size area) */
- (void)suword(ptr_area, imgp->ip_argc);
- ptr_area += sizeof(int);
- /* pad to ptr_size, if 64 bit image, to ensure user stack alignment */
- if (imgp->ip_flags & IMGPF_IS_64BIT) {
- (void)suword(ptr_area, 0); /* int, not long: ignored */
- ptr_area += sizeof(int);
+ if (descriptors[i].null_term) {
+ if (ptr_size == 8) {
+ *(uint64_t *)ptr_buffer = 0ULL;
+ } else {
+ *(uint32_t *)ptr_buffer = 0;
+ }
+
+ ptr_buffer = (void *)((uintptr_t)ptr_buffer + ptr_size);
+ }
}
-#if CONFIG_DTRACE
- p->p_dtrace_argv = ptr_area; /* user_addr_t &argv[0] for dtrace convenience */
-#endif /* CONFIG_DTRACE */
-
/*
- * We use (string_area - path_area) here rather than the more
- * intuitive (imgp->ip_argv - imgp->ip_strings) because we are
- * interested in the length of the PATH_AREA in user space,
- * rather than the actual length of the execution path, since
- * it includes alignment padding of the PATH_AREA + STRING_AREA
- * to a ptr_size boundary.
+ * Copy out all our pointer arrays in bulk.
*/
- strspace = SIZE_IMG_STRSPACE - (string_area - path_area);
- for (;;) {
- if (stringc == imgp->ip_envc) {
- /* argv[n] = NULL */
- (void)copyoutptr(0LL, ptr_area, ptr_size);
- ptr_area += ptr_size;
-#if CONFIG_DTRACE
- p->p_dtrace_envp = ptr_area; /* user_addr_t &env[0] for dtrace convenience */
-#endif /* CONFIG_DTRACE */
- }
- if (--stringc < 0)
- break;
-
- /* pointer: argv[n]/env[n] */
- (void)copyoutptr(string_area, ptr_area, ptr_size);
+ error = copyout(ptr_buffer_start, ptr_area,
+ ptr_area_size);
+ if (error)
+ goto bad;
- /* string : argv[n][]/env[n][] */
- do {
- if (strspace <= 0) {
- error = E2BIG;
- break;
- }
- error = copyoutstr(argv, string_area,
- (unsigned)strspace,
- (size_t *)&len);
- string_area += len;
- argv += len;
- strspace -= len;
- } while (error == ENAMETOOLONG);
- if (error == EFAULT || error == E2BIG)
- break; /* bad stack - user's problem */
- ptr_area += ptr_size;
- }
- /* env[n] = NULL */
- (void)copyoutptr(0LL, ptr_area, ptr_size);
+ /* argc (int32, stored in a ptr_size area) */
+ error = copyoutptr((user_addr_t)imgp->ip_argc, argc_area, ptr_size);
+ if (error)
+ goto bad;
bad:
return(error);
* Copy arguments and environment from user space into work area; we may
* have already copied some early arguments into the work area, and if
* so, any arguments opied in are appended to those already there.
+ * This function is the primary manipulator of ip_argspace, since
+ * these are the arguments the client of execve(2) knows about. After
+ * each argv[]/envv[] string is copied, we charge the string length
+ * and argv[]/envv[] pointer slot to ip_argspace, so that we can
+ * full preflight the arg list size.
*
* Parameters: struct image_params * the image parameter block
*
* Implicit returns;
* (imgp->ip_argc) Count of arguments, updated
* (imgp->ip_envc) Count of environment strings, updated
+ * (imgp->ip_argspace) Count of remaining of NCARGS
+ * (imgp->ip_interp_buffer) Interpreter and args (mutated in place)
*
*
* Note: The argument and environment vectors are user space pointers
{
int error = 0;
int ptr_size = (imgp->ip_flags & IMGPF_WAS_64BIT) ? 8 : 4;
+ int new_ptr_size = (imgp->ip_flags & IMGPF_IS_64BIT) ? 8 : 4;
user_addr_t argv = imgp->ip_user_argv;
user_addr_t envv = imgp->ip_user_envv;
/*
- * If the argument vector is NULL, this is the system startup
- * bootstrap from load_init_program(), and there's nothing to do
+ * Adjust space reserved for the path name by however much padding it
+ * needs. Doing this here since we didn't know if this would be a 32-
+ * or 64-bit process back in exec_save_path.
*/
- if (imgp->ip_user_argv == 0LL)
- goto bad;
-
- /* Now, get rest of arguments */
+ while (imgp->ip_strspace % new_ptr_size != 0) {
+ *imgp->ip_strendp++ = '\0';
+ imgp->ip_strspace--;
+ /* imgp->ip_argspace--; not counted towards exec args total */
+ }
/*
- * If we are running an interpreter, replace the av[0] that was
- * passed to execve() with the fully qualified path name that was
- * passed to execve() for interpreters which do not use the PATH
- * to locate their script arguments.
+ * From now on, we start attributing string space to ip_argspace
*/
- if((imgp->ip_flags & IMGPF_INTERPRET) != 0 && argv != 0LL) {
+ imgp->ip_startargv = imgp->ip_strendp;
+ imgp->ip_argc = 0;
+
+ if((imgp->ip_flags & IMGPF_INTERPRET) != 0) {
user_addr_t arg;
+ char *argstart, *ch;
+
+ /* First, the arguments in the "#!" string are tokenized and extracted. */
+ argstart = imgp->ip_interp_buffer;
+ while (argstart) {
+ ch = argstart;
+ while (*ch && !IS_WHITESPACE(*ch)) {
+ ch++;
+ }
- error = copyinptr(argv, &arg, ptr_size);
- if (error)
- goto bad;
- if (arg != 0LL && arg != (user_addr_t)-1) {
- argv += ptr_size;
- error = exec_add_string(imgp, imgp->ip_user_fname);
+ if (*ch == '\0') {
+ /* last argument, no need to NUL-terminate */
+ error = exec_add_user_string(imgp, CAST_USER_ADDR_T(argstart), UIO_SYSSPACE, TRUE);
+ argstart = NULL;
+ } else {
+ /* NUL-terminate */
+ *ch = '\0';
+ error = exec_add_user_string(imgp, CAST_USER_ADDR_T(argstart), UIO_SYSSPACE, TRUE);
+
+ /*
+ * Find the next string. We know spaces at the end of the string have already
+ * been stripped.
+ */
+ argstart = ch + 1;
+ while (IS_WHITESPACE(*argstart)) {
+ argstart++;
+ }
+ }
+
+ /* Error-check, regardless of whether this is the last interpreter arg or not */
if (error)
goto bad;
+ if (imgp->ip_argspace < new_ptr_size) {
+ error = E2BIG;
+ goto bad;
+ }
+ imgp->ip_argspace -= new_ptr_size; /* to hold argv[] entry */
imgp->ip_argc++;
}
+
+ if (argv != 0LL) {
+ /*
+ * If we are running an interpreter, replace the av[0] that was
+ * passed to execve() with the path name that was
+ * passed to execve() for interpreters which do not use the PATH
+ * to locate their script arguments.
+ */
+ error = copyinptr(argv, &arg, ptr_size);
+ if (error)
+ goto bad;
+ if (arg != 0LL) {
+ argv += ptr_size; /* consume without using */
+ }
+ }
+
+ if (imgp->ip_interp_sugid_fd != -1) {
+ char temp[19]; /* "/dev/fd/" + 10 digits + NUL */
+ snprintf(temp, sizeof(temp), "/dev/fd/%d", imgp->ip_interp_sugid_fd);
+ error = exec_add_user_string(imgp, CAST_USER_ADDR_T(temp), UIO_SYSSPACE, TRUE);
+ } else {
+ error = exec_add_user_string(imgp, imgp->ip_user_fname, imgp->ip_seg, TRUE);
+ }
+
+ if (error)
+ goto bad;
+ if (imgp->ip_argspace < new_ptr_size) {
+ error = E2BIG;
+ goto bad;
+ }
+ imgp->ip_argspace -= new_ptr_size; /* to hold argv[] entry */
+ imgp->ip_argc++;
}
while (argv != 0LL) {
if (error)
goto bad;
- argv += ptr_size;
if (arg == 0LL) {
break;
- } else if (arg == (user_addr_t)-1) {
- /* Um... why would it be -1? */
- error = EFAULT;
- goto bad;
}
+
+ argv += ptr_size;
+
/*
* av[n...] = arg[n]
*/
- error = exec_add_string(imgp, arg);
+ error = exec_add_user_string(imgp, arg, imgp->ip_seg, TRUE);
if (error)
goto bad;
+ if (imgp->ip_argspace < new_ptr_size) {
+ error = E2BIG;
+ goto bad;
+ }
+ imgp->ip_argspace -= new_ptr_size; /* to hold argv[] entry */
imgp->ip_argc++;
}
+ /* Save space for argv[] NULL terminator */
+ if (imgp->ip_argspace < new_ptr_size) {
+ error = E2BIG;
+ goto bad;
+ }
+ imgp->ip_argspace -= new_ptr_size;
+
+ /* Note where the args ends and env begins. */
+ imgp->ip_endargv = imgp->ip_strendp;
+ imgp->ip_envc = 0;
+
/* Now, get the environment */
while (envv != 0LL) {
user_addr_t env;
envv += ptr_size;
if (env == 0LL) {
break;
- } else if (env == (user_addr_t)-1) {
- error = EFAULT;
- goto bad;
}
/*
* av[n...] = env[n]
*/
- error = exec_add_string(imgp, env);
+ error = exec_add_user_string(imgp, env, imgp->ip_seg, TRUE);
if (error)
goto bad;
+ if (imgp->ip_argspace < new_ptr_size) {
+ error = E2BIG;
+ goto bad;
+ }
+ imgp->ip_argspace -= new_ptr_size; /* to hold envv[] entry */
imgp->ip_envc++;
}
+
+ /* Save space for envv[] NULL terminator */
+ if (imgp->ip_argspace < new_ptr_size) {
+ error = E2BIG;
+ goto bad;
+ }
+ imgp->ip_argspace -= new_ptr_size;
+
+ /* Align the tail of the combined argv+envv area */
+ while (imgp->ip_strspace % new_ptr_size != 0) {
+ if (imgp->ip_argspace < 1) {
+ error = E2BIG;
+ goto bad;
+ }
+ *imgp->ip_strendp++ = '\0';
+ imgp->ip_strspace--;
+ imgp->ip_argspace--;
+ }
+
+ /* Note where the envv ends and applev begins. */
+ imgp->ip_endenvv = imgp->ip_strendp;
+
+ /*
+ * From now on, we are no longer charging argument
+ * space to ip_argspace.
+ */
+
bad:
return error;
}
+static char *
+random_hex_str(char *str, int len, boolean_t embedNUL)
+{
+ uint64_t low, high, value;
+ int idx;
+ char digit;
+
+ /* A 64-bit value will only take 16 characters, plus '0x' and NULL. */
+ if (len > 19)
+ len = 19;
+
+ /* We need enough room for at least 1 digit */
+ if (len < 4)
+ return (NULL);
+
+ low = random();
+ high = random();
+ value = high << 32 | low;
+
+ if (embedNUL) {
+ /*
+ * Zero a byte to protect against C string vulnerabilities
+ * e.g. for userland __stack_chk_guard.
+ */
+ value &= ~(0xffull << 8);
+ }
+
+ str[0] = '0';
+ str[1] = 'x';
+ for (idx = 2; idx < len - 1; idx++) {
+ digit = value & 0xf;
+ value = value >> 4;
+ if (digit < 10)
+ str[idx] = '0' + digit;
+ else
+ str[idx] = 'a' + (digit - 10);
+ }
+ str[idx] = '\0';
+ return (str);
+}
+
+/*
+ * Libc has an 8-element array set up for stack guard values. It only fills
+ * in one of those entries, and both gcc and llvm seem to use only a single
+ * 8-byte guard. Until somebody needs more than an 8-byte guard value, don't
+ * do the work to construct them.
+ */
+#define GUARD_VALUES 1
+#define GUARD_KEY "stack_guard="
+
+/*
+ * System malloc needs some entropy when it is initialized.
+ */
+#define ENTROPY_VALUES 2
+#define ENTROPY_KEY "malloc_entropy="
+
+/*
+ * System malloc engages nanozone for UIAPP.
+ */
+#define NANO_ENGAGE_KEY "MallocNanoZone=1"
+
+#define PFZ_KEY "pfz="
+extern user32_addr_t commpage_text32_location;
+extern user64_addr_t commpage_text64_location;
+/*
+ * Build up the contents of the apple[] string vector
+ */
+static int
+exec_add_apple_strings(struct image_params *imgp)
+{
+ int i, error;
+ int new_ptr_size=4;
+ char guard[19];
+ char guard_vec[strlen(GUARD_KEY) + 19 * GUARD_VALUES + 1];
+
+ char entropy[19];
+ char entropy_vec[strlen(ENTROPY_KEY) + 19 * ENTROPY_VALUES + 1];
+
+ char pfz_string[strlen(PFZ_KEY) + 16 + 4 +1];
+
+ if( imgp->ip_flags & IMGPF_IS_64BIT) {
+ new_ptr_size = 8;
+ snprintf(pfz_string, sizeof(pfz_string),PFZ_KEY "0x%llx",commpage_text64_location);
+ } else {
+ snprintf(pfz_string, sizeof(pfz_string),PFZ_KEY "0x%x",commpage_text32_location);
+ }
+
+ /* exec_save_path stored the first string */
+ imgp->ip_applec = 1;
+
+ /* adding the pfz string */
+ error = exec_add_user_string(imgp, CAST_USER_ADDR_T(pfz_string),UIO_SYSSPACE,FALSE);
+ if(error)
+ goto bad;
+ imgp->ip_applec++;
+
+ /* adding the NANO_ENGAGE_KEY key */
+ if (imgp->ip_px_sa) {
+ int proc_flags = (((struct _posix_spawnattr *) imgp->ip_px_sa)->psa_flags);
+
+ if ((proc_flags & _POSIX_SPAWN_NANO_ALLOCATOR) == _POSIX_SPAWN_NANO_ALLOCATOR) {
+ char uiapp_string[strlen(NANO_ENGAGE_KEY) + 1];
+
+ snprintf(uiapp_string, sizeof(uiapp_string), NANO_ENGAGE_KEY);
+ error = exec_add_user_string(imgp, CAST_USER_ADDR_T(uiapp_string),UIO_SYSSPACE,FALSE);
+ if (error)
+ goto bad;
+ imgp->ip_applec++;
+ }
+ }
+
+ /*
+ * Supply libc with a collection of random values to use when
+ * implementing -fstack-protector.
+ *
+ * (The first random string always contains an embedded NUL so that
+ * __stack_chk_guard also protects against C string vulnerabilities)
+ */
+ (void)strlcpy(guard_vec, GUARD_KEY, sizeof (guard_vec));
+ for (i = 0; i < GUARD_VALUES; i++) {
+ random_hex_str(guard, sizeof (guard), i == 0);
+ if (i)
+ (void)strlcat(guard_vec, ",", sizeof (guard_vec));
+ (void)strlcat(guard_vec, guard, sizeof (guard_vec));
+ }
+
+ error = exec_add_user_string(imgp, CAST_USER_ADDR_T(guard_vec), UIO_SYSSPACE, FALSE);
+ if (error)
+ goto bad;
+ imgp->ip_applec++;
+
+ /*
+ * Supply libc with entropy for system malloc.
+ */
+ (void)strlcpy(entropy_vec, ENTROPY_KEY, sizeof(entropy_vec));
+ for (i = 0; i < ENTROPY_VALUES; i++) {
+ random_hex_str(entropy, sizeof (entropy), FALSE);
+ if (i)
+ (void)strlcat(entropy_vec, ",", sizeof (entropy_vec));
+ (void)strlcat(entropy_vec, entropy, sizeof (entropy_vec));
+ }
+
+ error = exec_add_user_string(imgp, CAST_USER_ADDR_T(entropy_vec), UIO_SYSSPACE, FALSE);
+ if (error)
+ goto bad;
+ imgp->ip_applec++;
+
+ /* Align the tail of the combined applev area */
+ while (imgp->ip_strspace % new_ptr_size != 0) {
+ *imgp->ip_strendp++ = '\0';
+ imgp->ip_strspace--;
+ }
+
+bad:
+ return error;
+}
#define unix_stack_size(p) (p->p_rlimit[RLIMIT_STACK].rlim_cur)
/*
* exec_check_permissions
*
- * Decription: Verify that the file that is being attempted to be executed
+ * Description: Verify that the file that is being attempted to be executed
* is in fact allowed to be executed based on it POSIX file
* permissions and other access control criteria
*
* will always succeed, and we don't want to happen unless the
* file really is executable.
*/
- if ((vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)
+ if (!vfs_authopaque(vnode_mount(vp)) && ((vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0))
return (EACCES);
/* Disallow zero length files */
imgp->ip_arch_offset = (user_size_t)0;
imgp->ip_arch_size = vap->va_data_size;
- /* Disable setuid-ness for traced programs or if MNT_NOSUID */
- if ((vp->v_mount->mnt_flag & MNT_NOSUID) || (p->p_lflag & P_LTRACED)) {
- vap->va_mode &= ~(VSUID | VSGID);
-#if CONFIG_MACF
- imgp->ip_no_trans = 1;
-#endif
- }
+ /* Disable setuid-ness for traced programs or if MNT_NOSUID */
+ if ((vp->v_mount->mnt_flag & MNT_NOSUID) || (p->p_lflag & P_LTRACED))
+ vap->va_mode &= ~(VSUID | VSGID);
+
+ /*
+ * Disable _POSIX_SPAWN_ALLOW_DATA_EXEC and _POSIX_SPAWN_DISABLE_ASLR
+ * flags for setuid/setgid binaries.
+ */
+ if (vap->va_mode & (VSUID | VSGID))
+ imgp->ip_flags &= ~(IMGPF_ALLOW_DATA_EXEC | IMGPF_DISABLE_ASLR);
#if CONFIG_MACF
error = mac_vnode_check_exec(imgp->ip_vfs_context, vp, imgp);
#endif
-#ifdef IMGPF_POWERPC
- /*
- * If the file we are about to attempt to load is the exec_handler_ppc,
- * which is determined by matching the vattr fields against previously
- * cached values, then we set the PowerPC environment flag.
- */
- if (vap->va_fsid == exec_archhandler_ppc.fsid &&
- vap->va_fileid == (uint64_t)((u_long)exec_archhandler_ppc.fileid)) {
- imgp->ip_flags |= IMGPF_POWERPC;
- }
-#endif /* IMGPF_POWERPC */
-
/* XXX May want to indicate to underlying FS that vnode is open */
return (error);
kauth_cred_t cred = vfs_context_ucred(imgp->ip_vfs_context);
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
int i;
- int is_member = 0;
+ int leave_sugid_clear = 0;
+ int mac_reset_ipc = 0;
int error = 0;
- struct vnode *dev_null = NULLVP;
#if CONFIG_MACF
- kauth_cred_t my_cred;
-#endif
+ int mac_transition, disjoint_cred = 0;
+ int label_update_return = 0;
-#if CONFIG_MACF
- int mac_transition;
- mac_transition = mac_cred_check_label_update_execve(imgp->ip_vfs_context, imgp->ip_vp,
- imgp->ip_scriptlabelp, imgp->ip_execlabelp, p);
+ /*
+ * Determine whether a call to update the MAC label will result in the
+ * credential changing.
+ *
+ * Note: MAC policies which do not actually end up modifying
+ * the label subsequently are strongly encouraged to
+ * return 0 for this check, since a non-zero answer will
+ * slow down the exec fast path for normal binaries.
+ */
+ mac_transition = mac_cred_check_label_update_execve(
+ imgp->ip_vfs_context,
+ imgp->ip_vp,
+ imgp->ip_arch_offset,
+ imgp->ip_scriptvp,
+ imgp->ip_scriptlabelp,
+ imgp->ip_execlabelp,
+ p,
+ imgp->ip_px_smpx);
#endif
- OSBitAndAtomic(~((uint32_t)P_SUGID), (UInt32 *)&p->p_flag);
+ OSBitAndAtomic(~((uint32_t)P_SUGID), &p->p_flag);
/*
* Order of the following is important; group checks must go last,
- * as we use the success of the 'is_member' check combined with the
+ * as we use the success of the 'ismember' check combined with the
* failure of the explicit match to indicate that we will be setting
* the egid of the process even though the new process did not
* require VSUID/VSGID bits in order for it to set the new group as
*/
if (((imgp->ip_origvattr->va_mode & VSUID) != 0 &&
kauth_cred_getuid(cred) != imgp->ip_origvattr->va_uid) ||
+ ((imgp->ip_origvattr->va_mode & VSGID) != 0 &&
+ ((kauth_cred_ismember_gid(cred, imgp->ip_origvattr->va_gid, &leave_sugid_clear) || !leave_sugid_clear) ||
+ (kauth_cred_getgid(cred) != imgp->ip_origvattr->va_gid)))) {
+
#if CONFIG_MACF
- mac_transition || /* A policy wants to transition */
+/* label for MAC transition and neither VSUID nor VSGID */
+handle_mac_transition:
#endif
- ((imgp->ip_origvattr->va_mode & VSGID) != 0 &&
- ((kauth_cred_ismember_gid(cred, imgp->ip_origvattr->va_gid, &is_member) || !is_member) ||
- (cred->cr_gid != imgp->ip_origvattr->va_gid)))) {
/*
* Replace the credential with a copy of itself if euid or
*/
if (imgp->ip_origvattr->va_mode & VSUID) {
p->p_ucred = kauth_cred_setresuid(p->p_ucred, KAUTH_UID_NONE, imgp->ip_origvattr->va_uid, imgp->ip_origvattr->va_uid, KAUTH_UID_NONE);
+ /* update cred on proc */
+ PROC_UPDATE_CREDS_ONPROC(p);
}
if (imgp->ip_origvattr->va_mode & VSGID) {
p->p_ucred = kauth_cred_setresgid(p->p_ucred, KAUTH_GID_NONE, imgp->ip_origvattr->va_gid, imgp->ip_origvattr->va_gid);
+ /* update cred on proc */
+ PROC_UPDATE_CREDS_ONPROC(p);
}
#if CONFIG_MACF
/*
- * XXXMAC: In FreeBSD, we set P_SUGID on a MAC transition
- * to protect against debuggers being attached by an
- * insufficiently privileged process onto the result of
- * a transition to a more privileged credential. This is
- * too conservative on FreeBSD, but we need to do
- * something similar here, or risk vulnerability.
- *
- * Before we make the call into the MAC policies, get a new
+ * If a policy has indicated that it will transition the label,
+ * before making the call into the MAC policies, get a new
* duplicate credential, so they can modify it without
* modifying any others sharing it.
*/
- if (mac_transition && !imgp->ip_no_trans) {
+ if (mac_transition) {
kauth_proc_label_update_execve(p,
- imgp->ip_vfs_context,
- imgp->ip_vp,
- imgp->ip_scriptlabelp, imgp->ip_execlabelp);
-
- my_cred = kauth_cred_proc_ref(p);
- mac_task_label_update_cred(my_cred, p->task);
- kauth_cred_unref(&my_cred);
+ imgp->ip_vfs_context,
+ imgp->ip_vp,
+ imgp->ip_arch_offset,
+ imgp->ip_scriptvp,
+ imgp->ip_scriptlabelp,
+ imgp->ip_execlabelp,
+ &imgp->ip_csflags,
+ imgp->ip_px_smpx,
+ &disjoint_cred, /* will be non zero if disjoint */
+ &label_update_return);
+
+ if (disjoint_cred) {
+ /*
+ * If updating the MAC label resulted in a
+ * disjoint credential, flag that we need to
+ * set the P_SUGID bit. This protects
+ * against debuggers being attached by an
+ * insufficiently privileged process onto the
+ * result of a transition to a more privileged
+ * credential.
+ */
+ leave_sugid_clear = 0;
+ }
+
+ imgp->ip_mac_return = label_update_return;
}
-#endif
+
+ mac_reset_ipc = mac_proc_check_inherit_ipc_ports(p, p->p_textvp, p->p_textoff, imgp->ip_vp, imgp->ip_arch_offset, imgp->ip_scriptvp);
+
+#endif /* CONFIG_MACF */
+
/*
- * Have mach reset the task and thread ports.
- * We don't want anyone who had the ports before
- * a setuid exec to be able to access/control the
- * task/thread after.
+ * If 'leave_sugid_clear' is non-zero, then we passed the
+ * VSUID and MACF checks, and successfully determined that
+ * the previous cred was a member of the VSGID group, but
+ * that it was not the default at the time of the execve,
+ * and that the post-labelling credential was not disjoint.
+ * So we don't set the P_SUGID or reset mach ports and fds
+ * on the basis of simply running this code.
*/
- if (current_task() == p->task) {
+ if (mac_reset_ipc || !leave_sugid_clear) {
+ /*
+ * Have mach reset the task and thread ports.
+ * We don't want anyone who had the ports before
+ * a setuid exec to be able to access/control the
+ * task/thread after.
+ */
ipc_task_reset(p->task);
- ipc_thread_reset(current_thread());
+ ipc_thread_reset((imgp->ip_new_thread != NULL) ?
+ imgp->ip_new_thread : current_thread());
}
- /*
- * If 'is_member' is non-zero, then we passed the VSUID and
- * MACF checks, and successfully determined that the previous
- * cred was a member of the VSGID group, but that it was not
- * the default at the time of the execve. So we don't set the
- * P_SUGID on the basis of simply running this code.
- */
- if (!is_member)
- OSBitOrAtomic(P_SUGID, (UInt32 *)&p->p_flag);
+ if (!leave_sugid_clear) {
+ /*
+ * Flag the process as setuid.
+ */
+ OSBitOrAtomic(P_SUGID, &p->p_flag);
- /* Cache the vnode for /dev/null the first time around */
- if (dev_null == NULLVP) {
- struct nameidata nd1;
+ /*
+ * Radar 2261856; setuid security hole fix
+ * XXX For setuid processes, attempt to ensure that
+ * stdin, stdout, and stderr are already allocated.
+ * We do not want userland to accidentally allocate
+ * descriptors in this range which has implied meaning
+ * to libc.
+ */
+ for (i = 0; i < 3; i++) {
- NDINIT(&nd1, LOOKUP, FOLLOW, UIO_SYSSPACE32,
- CAST_USER_ADDR_T("/dev/null"),
- imgp->ip_vfs_context);
+ if (p->p_fd->fd_ofiles[i] != NULL)
+ continue;
- if ((error = vn_open(&nd1, FREAD, 0)) == 0) {
- dev_null = nd1.ni_vp;
/*
- * vn_open returns with both a use_count
- * and an io_count on the found vnode
- * drop the io_count, but keep the use_count
+ * Do the kernel equivalent of
+ *
+ * if i == 0
+ * (void) open("/dev/null", O_RDONLY);
+ * else
+ * (void) open("/dev/null", O_WRONLY);
*/
- vnode_put(nd1.ni_vp);
- }
- }
- /* Radar 2261856; setuid security hole fix */
- /* Patch from OpenBSD: A. Ramesh */
- /*
- * XXX For setuid processes, attempt to ensure that
- * stdin, stdout, and stderr are already allocated.
- * We do not want userland to accidentally allocate
- * descriptors in this range which has implied meaning
- * to libc.
- */
- if (dev_null != NULLVP) {
- for (i = 0; i < 3; i++) {
struct fileproc *fp;
int indx;
+ int flag;
+ struct nameidata *ndp = NULL;
- if (p->p_fd->fd_ofiles[i] != NULL)
- continue;
+ if (i == 0)
+ flag = FREAD;
+ else
+ flag = FWRITE;
- if ((error = falloc(p, &fp, &indx, imgp->ip_vfs_context)) != 0)
+ if ((error = falloc(p,
+ &fp, &indx, imgp->ip_vfs_context)) != 0)
continue;
- if ((error = vnode_ref_ext(dev_null, FREAD)) != 0) {
+ MALLOC(ndp, struct nameidata *, sizeof(*ndp), M_TEMP, M_WAITOK | M_ZERO);
+ if (ndp == NULL) {
+ error = ENOMEM;
+ break;
+ }
+
+ NDINIT(ndp, LOOKUP, OP_OPEN, FOLLOW, UIO_SYSSPACE,
+ CAST_USER_ADDR_T("/dev/null"),
+ imgp->ip_vfs_context);
+
+ if ((error = vn_open(ndp, flag, 0)) != 0) {
fp_free(p, indx, fp);
break;
}
- fp->f_fglob->fg_flag = FREAD;
- fp->f_fglob->fg_type = DTYPE_VNODE;
- fp->f_fglob->fg_ops = &vnops;
- fp->f_fglob->fg_data = (caddr_t)dev_null;
-
+ struct fileglob *fg = fp->f_fglob;
+
+ fg->fg_flag = flag;
+ fg->fg_ops = &vnops;
+ fg->fg_data = ndp->ni_vp;
+
+ vnode_put(ndp->ni_vp);
+
proc_fdlock(p);
procfdtbl_releasefd(p, indx, NULL);
fp_drop(p, indx, fp, 1);
proc_fdunlock(p);
+
+ FREE(ndp, M_TEMP);
}
- /*
- * for now we need to drop the reference immediately
- * since we don't have any mechanism in place to
- * release it before starting to unmount "/dev"
- * during a reboot/shutdown
- */
- vnode_rele(dev_null);
- dev_null = NULLVP;
}
}
+#if CONFIG_MACF
+ else {
+ /*
+ * We are here because we were told that the MAC label will
+ * be transitioned, and the binary is not VSUID or VSGID; to
+ * deal with this case, we could either duplicate a lot of
+ * code, or we can indicate we want to default the P_SUGID
+ * bit clear and jump back up.
+ */
+ if (mac_transition) {
+ leave_sugid_clear = 1;
+ goto handle_mac_transition;
+ }
+ }
+
+#endif /* CONFIG_MACF */
/*
* Implement the semantic where the effective user and group become
* the saved user and group in exec'ed programs.
*/
- p->p_ucred = kauth_cred_setsvuidgid(p->p_ucred, kauth_cred_getuid(p->p_ucred), p->p_ucred->cr_gid);
+ p->p_ucred = kauth_cred_setsvuidgid(p->p_ucred, kauth_cred_getuid(p->p_ucred), kauth_cred_getgid(p->p_ucred));
+ /* update cred on proc */
+ PROC_UPDATE_CREDS_ONPROC(p);
/* Update the process' identity version and set the security token */
p->p_idversion++;
* limits on stack growth, if they end up being needed.
*
* Parameters: p Process to set stack on
- * user_stack Address to set stack for process to
- * customstack FALSE if no custom stack in binary
- * map Address map in which to allocate the
- * new stack, if 'customstack' is FALSE
+ * load_result Information from mach-o load commands
+ * map Address map in which to allocate the new stack
*
* Returns: KERN_SUCCESS Stack successfully created
* !KERN_SUCCESS Mach failure code
*/
static kern_return_t
-create_unix_stack(vm_map_t map, user_addr_t user_stack, int customstack,
+create_unix_stack(vm_map_t map, load_result_t* load_result,
proc_t p)
{
mach_vm_size_t size, prot_size;
mach_vm_offset_t addr, prot_addr;
kern_return_t kr;
+ mach_vm_address_t user_stack = load_result->user_stack;
+
proc_lock(p);
p->user_stack = user_stack;
proc_unlock(p);
- if (!customstack) {
+ if (!load_result->prog_allocated_stack) {
/*
* Allocate enough space for the maximum stack size we
* will ever authorize and an extra page to act as
- * a guard page for stack overflows.
+ * a guard page for stack overflows. For default stacks,
+ * vm_initial_limit_stack takes care of the extra guard page.
+ * Otherwise we must allocate it ourselves.
*/
- size = mach_vm_round_page(MAXSSIZ);
-#if STACK_GROWTH_UP
- addr = mach_vm_trunc_page(user_stack);
-#else /* STACK_GROWTH_UP */
- addr = mach_vm_trunc_page(user_stack - size);
-#endif /* STACK_GROWTH_UP */
+
+ size = mach_vm_round_page(load_result->user_stack_size);
+ if (load_result->prog_stack_size)
+ size += PAGE_SIZE;
+ addr = mach_vm_trunc_page(load_result->user_stack - size);
kr = mach_vm_allocate(map, &addr, size,
VM_MAKE_TAG(VM_MEMORY_STACK) |
- VM_FLAGS_FIXED);
+ VM_FLAGS_FIXED);
if (kr != KERN_SUCCESS) {
- return kr;
+ /* If can't allocate at default location, try anywhere */
+ addr = 0;
+ kr = mach_vm_allocate(map, &addr, size,
+ VM_MAKE_TAG(VM_MEMORY_STACK) |
+ VM_FLAGS_ANYWHERE);
+ if (kr != KERN_SUCCESS)
+ return kr;
+
+ user_stack = addr + size;
+ load_result->user_stack = user_stack;
+
+ proc_lock(p);
+ p->user_stack = user_stack;
+ proc_unlock(p);
}
+
/*
* And prevent access to what's above the current stack
* size limit for this process.
*/
prot_addr = addr;
-#if STACK_GROWTH_UP
- prot_addr += unix_stack_size(p);
-#endif /* STACK_GROWTH_UP */
- prot_addr = mach_vm_round_page(prot_addr);
- prot_size = mach_vm_trunc_page(size - unix_stack_size(p));
+ if (load_result->prog_stack_size)
+ prot_size = PAGE_SIZE;
+ else
+ prot_size = mach_vm_trunc_page(size - unix_stack_size(p));
kr = mach_vm_protect(map,
- prot_addr,
- prot_size,
- FALSE,
- VM_PROT_NONE);
+ prot_addr,
+ prot_size,
+ FALSE,
+ VM_PROT_NONE);
if (kr != KERN_SUCCESS) {
(void) mach_vm_deallocate(map, addr, size);
return kr;
}
}
+
return KERN_SUCCESS;
}
#include <sys/reboot.h>
-static char init_program_name[128] = "/sbin/launchd";
-
-struct execve_args init_exec_args;
+static const char * init_programs[] = {
+#if DEVELOPMENT || DEBUG
+ "/usr/local/sbin/launchd.development",
+#endif
+ "/sbin/launchd",
+};
/*
* load_init_program
void
load_init_program(proc_t p)
{
- vm_offset_t init_addr;
- int argc = 0;
- char *argv[3];
+ vm_offset_t init_addr, addr;
+ int argc;
+ uint32_t argv[3];
+ unsigned int i;
int error;
- register_t retval[2];
-
- /*
- * Copy out program name.
- */
+ int retval[2];
+ const char *init_program_name;
+ struct execve_args init_exec_args;
init_addr = VM_MIN_ADDRESS;
- (void) vm_allocate(current_map(), &init_addr, PAGE_SIZE,
- VM_FLAGS_ANYWHERE);
+ (void) vm_allocate(current_map(), &init_addr, PAGE_SIZE, VM_FLAGS_ANYWHERE);
if (init_addr == 0)
init_addr++;
+
+ for (i = 0; i < sizeof(init_programs)/sizeof(init_programs[0]); i++) {
+
+ init_program_name = init_programs[i];
+ addr = init_addr;
+ argc = 0;
- (void) copyout((caddr_t) init_program_name, CAST_USER_ADDR_T(init_addr),
- (unsigned) sizeof(init_program_name)+1);
-
- argv[argc++] = (char *) init_addr;
- init_addr += sizeof(init_program_name);
- init_addr = (vm_offset_t)ROUND_PTR(char, init_addr);
+ /*
+ * Copy out program name.
+ */
+ (void) copyout(init_program_name, CAST_USER_ADDR_T(addr), strlen(init_program_name)+1);
- /*
- * Put out first (and only) argument, similarly.
- * Assumes everything fits in a page as allocated
- * above.
- */
- if (boothowto & RB_SINGLE) {
- const char *init_args = "-s";
+ argv[argc++] = (uint32_t)addr;
+ addr += strlen(init_program_name)+1;
+ addr = (vm_offset_t)ROUND_PTR(char, addr);
- copyout(init_args, CAST_USER_ADDR_T(init_addr),
- strlen(init_args));
+ /*
+ * Put out first (and only) argument, similarly.
+ * Assumes everything fits in a page as allocated above.
+ */
+ if (boothowto & RB_SINGLE) {
+ const char *init_args = "-s";
- argv[argc++] = (char *)init_addr;
- init_addr += strlen(init_args);
- init_addr = (vm_offset_t)ROUND_PTR(char, init_addr);
+ copyout(init_args, CAST_USER_ADDR_T(addr), strlen(init_args)+1);
- }
+ argv[argc++] = (uint32_t)addr;
+ addr += strlen(init_args)+1;
+ addr = (vm_offset_t)ROUND_PTR(char, addr);
+ }
- /*
- * Null-end the argument list
- */
- argv[argc] = NULL;
-
- /*
- * Copy out the argument list.
- */
+ /*
+ * Null-end the argument list
+ */
+ argv[argc] = 0;
- (void) copyout((caddr_t) argv, CAST_USER_ADDR_T(init_addr),
- (unsigned) sizeof(argv));
-
- /*
- * Set up argument block for fake call to execve.
- */
+ /*
+ * Copy out the argument list.
+ */
+ (void) copyout(argv, CAST_USER_ADDR_T(addr), sizeof(argv));
- init_exec_args.fname = CAST_USER_ADDR_T(argv[0]);
- init_exec_args.argp = CAST_USER_ADDR_T((char **)init_addr);
- init_exec_args.envp = CAST_USER_ADDR_T(0);
+ /*
+ * Set up argument block for fake call to execve.
+ */
+ init_exec_args.fname = CAST_USER_ADDR_T(argv[0]);
+ init_exec_args.argp = CAST_USER_ADDR_T((char **)addr);
+ init_exec_args.envp = CAST_USER_ADDR_T(0);
- /*
- * So that mach_init task is set with uid,gid 0 token
- */
- set_security_token(p);
+ /*
+ * So that init task is set with uid,gid 0 token
+ */
+ set_security_token(p);
- error = execve(p,&init_exec_args,retval);
- if (error)
- panic("Process 1 exec of %s failed, errno %d\n",
- init_program_name, error);
+ error = execve(p, &init_exec_args, retval);
+ if (!error)
+ return;
+ }
+
+ panic("Process 1 exec of %s failed, errno %d", init_program_name, error);
}
/*
case LOAD_IOERROR:
return EIO;
case LOAD_FAILURE:
+ case LOAD_DECRYPTFAIL:
default:
return EBADEXEC;
}
#include <kern/clock.h>
#include <mach/kern_return.h>
-extern semaphore_t execve_semaphore;
-
/*
* execargs_alloc
*
* not modified its environment, we can't really know that it's
* really a block there as well.
*/
+
+
+static int execargs_waiters = 0;
+lck_mtx_t *execargs_cache_lock;
+
+static void
+execargs_lock_lock(void) {
+ lck_mtx_lock_spin(execargs_cache_lock);
+}
+
+static void
+execargs_lock_unlock(void) {
+ lck_mtx_unlock(execargs_cache_lock);
+}
+
+static wait_result_t
+execargs_lock_sleep(void) {
+ return(lck_mtx_sleep(execargs_cache_lock, LCK_SLEEP_DEFAULT, &execargs_free_count, THREAD_INTERRUPTIBLE));
+}
+
+static kern_return_t
+execargs_purgeable_allocate(char **execarg_address) {
+ kern_return_t kr = vm_allocate(bsd_pageable_map, (vm_offset_t *)execarg_address, BSD_PAGEABLE_SIZE_PER_EXEC, VM_FLAGS_ANYWHERE | VM_FLAGS_PURGABLE);
+ assert(kr == KERN_SUCCESS);
+ return kr;
+}
+
+static kern_return_t
+execargs_purgeable_reference(void *execarg_address) {
+ int state = VM_PURGABLE_NONVOLATILE;
+ kern_return_t kr = vm_purgable_control(bsd_pageable_map, (vm_offset_t) execarg_address, VM_PURGABLE_SET_STATE, &state);
+
+ assert(kr == KERN_SUCCESS);
+ return kr;
+}
+
+static kern_return_t
+execargs_purgeable_volatilize(void *execarg_address) {
+ int state = VM_PURGABLE_VOLATILE | VM_PURGABLE_ORDERING_OBSOLETE;
+ kern_return_t kr;
+ kr = vm_purgable_control(bsd_pageable_map, (vm_offset_t) execarg_address, VM_PURGABLE_SET_STATE, &state);
+
+ assert(kr == KERN_SUCCESS);
+
+ return kr;
+}
+
+static void
+execargs_wakeup_waiters(void) {
+ thread_wakeup(&execargs_free_count);
+}
+
static int
execargs_alloc(struct image_params *imgp)
{
kern_return_t kret;
+ wait_result_t res;
+ int i, cache_index = -1;
- kret = semaphore_wait(execve_semaphore);
- if (kret != KERN_SUCCESS)
- switch (kret) {
- default:
- return (EINVAL);
- case KERN_INVALID_ADDRESS:
- case KERN_PROTECTION_FAILURE:
- return (EACCES);
- case KERN_ABORTED:
- case KERN_OPERATION_TIMED_OUT:
+ execargs_lock_lock();
+
+ while (execargs_free_count == 0) {
+ execargs_waiters++;
+ res = execargs_lock_sleep();
+ execargs_waiters--;
+ if (res != THREAD_AWAKENED) {
+ execargs_lock_unlock();
return (EINTR);
}
+ }
+
+ execargs_free_count--;
+
+ for (i = 0; i < execargs_cache_size; i++) {
+ vm_offset_t element = execargs_cache[i];
+ if (element) {
+ cache_index = i;
+ imgp->ip_strings = (char *)(execargs_cache[i]);
+ execargs_cache[i] = 0;
+ break;
+ }
+ }
+
+ assert(execargs_free_count >= 0);
+
+ execargs_lock_unlock();
+
+ if (cache_index == -1) {
+ kret = execargs_purgeable_allocate(&imgp->ip_strings);
+ }
+ else
+ kret = execargs_purgeable_reference(imgp->ip_strings);
- kret = kmem_alloc_pageable(bsd_pageable_map, (vm_offset_t *)&imgp->ip_strings, NCARGS + PAGE_SIZE);
- imgp->ip_vdata = imgp->ip_strings + NCARGS;
+ assert(kret == KERN_SUCCESS);
if (kret != KERN_SUCCESS) {
- semaphore_signal(execve_semaphore);
return (ENOMEM);
}
+
+ /* last page used to read in file headers */
+ imgp->ip_vdata = imgp->ip_strings + ( NCARGS + PAGE_SIZE );
+ imgp->ip_strendp = imgp->ip_strings;
+ imgp->ip_argspace = NCARGS;
+ imgp->ip_strspace = ( NCARGS + PAGE_SIZE );
+
return (0);
}
execargs_free(struct image_params *imgp)
{
kern_return_t kret;
+ int i;
+ boolean_t needs_wakeup = FALSE;
+
+ kret = execargs_purgeable_volatilize(imgp->ip_strings);
- kmem_free(bsd_pageable_map, (vm_offset_t)imgp->ip_strings, NCARGS + PAGE_SIZE);
- imgp->ip_strings = NULL;
-
- kret = semaphore_signal(execve_semaphore);
- switch (kret) {
- case KERN_INVALID_ADDRESS:
- case KERN_PROTECTION_FAILURE:
- return (EINVAL);
- case KERN_ABORTED:
- case KERN_OPERATION_TIMED_OUT:
- return (EINTR);
- case KERN_SUCCESS:
- return(0);
- default:
- return (EINVAL);
+ execargs_lock_lock();
+ execargs_free_count++;
+
+ for (i = 0; i < execargs_cache_size; i++) {
+ vm_offset_t element = execargs_cache[i];
+ if (element == 0) {
+ execargs_cache[i] = (vm_offset_t) imgp->ip_strings;
+ imgp->ip_strings = NULL;
+ break;
+ }
}
+
+ assert(imgp->ip_strings == NULL);
+
+ if (execargs_waiters > 0)
+ needs_wakeup = TRUE;
+
+ execargs_lock_unlock();
+
+ if (needs_wakeup == TRUE)
+ execargs_wakeup_waiters();
+
+ return ((kret == KERN_SUCCESS ? 0 : EINVAL));
}
static void
}
+/*
+ * If the process is not signed or if it contains entitlements, we
+ * need to communicate through the task_access_port to taskgated.
+ *
+ * taskgated will provide a detached code signature if present, and
+ * will enforce any restrictions on entitlements.
+ */
+
+static boolean_t
+taskgated_required(proc_t p, boolean_t *require_success)
+{
+ size_t length;
+ void *blob;
+ int error;
+
+ if ((p->p_csflags & CS_VALID) == 0) {
+ *require_success = FALSE;
+ return TRUE;
+ }
+
+ error = cs_entitlements_blob_get(p, &blob, &length);
+ if (error == 0 && blob != NULL) {
+ /*
+ * fatal on the desktop when entitlements are present,
+ * unless we started in single-user mode
+ */
+ if ((boothowto & RB_SINGLE) == 0)
+ *require_success = TRUE;
+ /*
+ * Allow initproc to run without causing taskgated to launch
+ */
+ if (p == initproc) {
+ *require_success = FALSE;
+ return FALSE;
+ }
+
+ return TRUE;
+ }
+
+ *require_success = FALSE;
+ return 0;
+}
+
+/*
+ * __EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__
+ *
+ * Description: Waits for the userspace daemon to respond to the request
+ * we made. Function declared non inline to be visible in
+ * stackshots and spindumps as well as debugging.
+ */
+__attribute__((noinline)) int
+__EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__(mach_port_t task_access_port, int32_t new_pid)
+{
+ return find_code_signature(task_access_port, new_pid);
+}
+
+static int
+check_for_signature(proc_t p, struct image_params *imgp)
+{
+ mach_port_t port = NULL;
+ kern_return_t kr = KERN_FAILURE;
+ int error = EACCES;
+ boolean_t unexpected_failure = FALSE;
+ unsigned char hash[SHA1_RESULTLEN];
+ boolean_t require_success = FALSE;
+ int spawn = (imgp->ip_flags & IMGPF_SPAWN);
+ int vfexec = (imgp->ip_flags & IMGPF_VFORK_EXEC);
+
+ /*
+ * Override inherited code signing flags with the
+ * ones for the process that is being successfully
+ * loaded
+ */
+ proc_lock(p);
+ p->p_csflags = imgp->ip_csflags;
+ proc_unlock(p);
+
+ /* Set the switch_protect flag on the map */
+ if(p->p_csflags & (CS_HARD|CS_KILL)) {
+ vm_map_switch_protect(get_task_map(p->task), TRUE);
+ }
+
+ /*
+ * image activation may be failed due to policy
+ * which is unexpected but security framework does not
+ * approve of exec, kill and return immediately.
+ */
+ if (imgp->ip_mac_return != 0) {
+ error = imgp->ip_mac_return;
+ unexpected_failure = TRUE;
+ goto done;
+ }
+
+ /* check if callout to taskgated is needed */
+ if (!taskgated_required(p, &require_success)) {
+ error = 0;
+ goto done;
+ }
+
+ kr = task_get_task_access_port(p->task, &port);
+ if (KERN_SUCCESS != kr || !IPC_PORT_VALID(port)) {
+ error = 0;
+ if (require_success)
+ error = EACCES;
+ goto done;
+ }
+
+ /*
+ * taskgated returns KERN_SUCCESS if it has completed its work
+ * and the exec should continue, KERN_FAILURE if the exec should
+ * fail, or it may error out with different error code in an
+ * event of mig failure (e.g. process was signalled during the
+ * rpc call, taskgated died, mig server died etc.).
+ */
+
+ kr = __EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__(port, p->p_pid);
+ switch (kr) {
+ case KERN_SUCCESS:
+ error = 0;
+ break;
+ case KERN_FAILURE:
+ error = EACCES;
+ goto done;
+ default:
+ error = EACCES;
+ unexpected_failure = TRUE;
+ goto done;
+ }
+
+ /* Only do this if exec_resettextvp() did not fail */
+ if (p->p_textvp != NULLVP) {
+ /*
+ * If there's a new code directory, mark this process
+ * as signed.
+ */
+ if (0 == ubc_cs_getcdhash(p->p_textvp, p->p_textoff, hash)) {
+ proc_lock(p);
+ p->p_csflags |= CS_VALID;
+ proc_unlock(p);
+ }
+ }
+
+done:
+ if (0 != error) {
+ if (!unexpected_failure)
+ p->p_csflags |= CS_KILLED;
+ /* make very sure execution fails */
+ if (vfexec || spawn) {
+ psignal_vfork(p, p->task, imgp->ip_new_thread, SIGKILL);
+ error = 0;
+ } else {
+ psignal(p, SIGKILL);
+ }
+ }
+ return error;
+}
+
+/*
+ * Typically as soon as we start executing this process, the
+ * first instruction will trigger a VM fault to bring the text
+ * pages (as executable) into the address space, followed soon
+ * thereafter by dyld data structures (for dynamic executable).
+ * To optimize this, as well as improve support for hardware
+ * debuggers that can only access resident pages present
+ * in the process' page tables, we prefault some pages if
+ * possible. Errors are non-fatal.
+ */
+static void exec_prefault_data(proc_t p __unused, struct image_params *imgp, load_result_t *load_result)
+{
+ int ret;
+ size_t expected_all_image_infos_size;
+
+ /*
+ * Prefault executable or dyld entry point.
+ */
+ vm_fault(current_map(),
+ vm_map_trunc_page(load_result->entry_point,
+ vm_map_page_mask(current_map())),
+ VM_PROT_READ | VM_PROT_EXECUTE,
+ FALSE,
+ THREAD_UNINT, NULL, 0);
+
+ if (imgp->ip_flags & IMGPF_IS_64BIT) {
+ expected_all_image_infos_size = sizeof(struct user64_dyld_all_image_infos);
+ } else {
+ expected_all_image_infos_size = sizeof(struct user32_dyld_all_image_infos);
+ }
+
+ /* Decode dyld anchor structure from <mach-o/dyld_images.h> */
+ if (load_result->dynlinker &&
+ load_result->all_image_info_addr &&
+ load_result->all_image_info_size >= expected_all_image_infos_size) {
+ union {
+ struct user64_dyld_all_image_infos infos64;
+ struct user32_dyld_all_image_infos infos32;
+ } all_image_infos;
+
+ /*
+ * Pre-fault to avoid copyin() going through the trap handler
+ * and recovery path.
+ */
+ vm_fault(current_map(),
+ vm_map_trunc_page(load_result->all_image_info_addr,
+ vm_map_page_mask(current_map())),
+ VM_PROT_READ | VM_PROT_WRITE,
+ FALSE,
+ THREAD_UNINT, NULL, 0);
+ if ((load_result->all_image_info_addr & PAGE_MASK) + expected_all_image_infos_size > PAGE_SIZE) {
+ /* all_image_infos straddles a page */
+ vm_fault(current_map(),
+ vm_map_trunc_page(load_result->all_image_info_addr + expected_all_image_infos_size - 1,
+ vm_map_page_mask(current_map())),
+ VM_PROT_READ | VM_PROT_WRITE,
+ FALSE,
+ THREAD_UNINT, NULL, 0);
+ }
+
+ ret = copyin(load_result->all_image_info_addr,
+ &all_image_infos,
+ expected_all_image_infos_size);
+ if (ret == 0 && all_image_infos.infos32.version >= 9) {
+
+ user_addr_t notification_address;
+ user_addr_t dyld_image_address;
+ user_addr_t dyld_version_address;
+ user_addr_t dyld_all_image_infos_address;
+ user_addr_t dyld_slide_amount;
+
+ if (imgp->ip_flags & IMGPF_IS_64BIT) {
+ notification_address = all_image_infos.infos64.notification;
+ dyld_image_address = all_image_infos.infos64.dyldImageLoadAddress;
+ dyld_version_address = all_image_infos.infos64.dyldVersion;
+ dyld_all_image_infos_address = all_image_infos.infos64.dyldAllImageInfosAddress;
+ } else {
+ notification_address = all_image_infos.infos32.notification;
+ dyld_image_address = all_image_infos.infos32.dyldImageLoadAddress;
+ dyld_version_address = all_image_infos.infos32.dyldVersion;
+ dyld_all_image_infos_address = all_image_infos.infos32.dyldAllImageInfosAddress;
+ }
+
+ /*
+ * dyld statically sets up the all_image_infos in its Mach-O
+ * binary at static link time, with pointers relative to its default
+ * load address. Since ASLR might slide dyld before its first
+ * instruction is executed, "dyld_slide_amount" tells us how far
+ * dyld was loaded compared to its default expected load address.
+ * All other pointers into dyld's image should be adjusted by this
+ * amount. At some point later, dyld will fix up pointers to take
+ * into account the slide, at which point the all_image_infos_address
+ * field in the structure will match the runtime load address, and
+ * "dyld_slide_amount" will be 0, if we were to consult it again.
+ */
+
+ dyld_slide_amount = load_result->all_image_info_addr - dyld_all_image_infos_address;
+
+#if 0
+ kprintf("exec_prefault: 0x%016llx 0x%08x 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n",
+ (uint64_t)load_result->all_image_info_addr,
+ all_image_infos.infos32.version,
+ (uint64_t)notification_address,
+ (uint64_t)dyld_image_address,
+ (uint64_t)dyld_version_address,
+ (uint64_t)dyld_all_image_infos_address);
+#endif
+
+ vm_fault(current_map(),
+ vm_map_trunc_page(notification_address + dyld_slide_amount,
+ vm_map_page_mask(current_map())),
+ VM_PROT_READ | VM_PROT_EXECUTE,
+ FALSE,
+ THREAD_UNINT, NULL, 0);
+ vm_fault(current_map(),
+ vm_map_trunc_page(dyld_image_address + dyld_slide_amount,
+ vm_map_page_mask(current_map())),
+ VM_PROT_READ | VM_PROT_EXECUTE,
+ FALSE,
+ THREAD_UNINT, NULL, 0);
+ vm_fault(current_map(),
+ vm_map_trunc_page(dyld_version_address + dyld_slide_amount,
+ vm_map_page_mask(current_map())),
+ VM_PROT_READ,
+ FALSE,
+ THREAD_UNINT, NULL, 0);
+ vm_fault(current_map(),
+ vm_map_trunc_page(dyld_all_image_infos_address + dyld_slide_amount,
+ vm_map_page_mask(current_map())),
+ VM_PROT_READ | VM_PROT_WRITE,
+ FALSE,
+ THREAD_UNINT, NULL, 0);
+ }
+ }
+}
projects / apple / xnu.git / blobdiff