/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
-#include <sys/proc.h>
+#include <sys/proc_internal.h>
+#include <sys/kauth.h>
#include <sys/user.h>
-#include <sys/buf.h>
#include <sys/socketvar.h>
#include <sys/malloc.h>
#include <sys/namei.h>
-#include <sys/mount.h>
-#include <sys/vnode.h>
-#include <sys/file.h>
+#include <sys/mount_internal.h>
+#include <sys/vnode_internal.h>
+#include <sys/file_internal.h>
#include <sys/stat.h>
-#include <sys/uio.h>
+#include <sys/uio_internal.h>
#include <sys/acct.h>
#include <sys/exec.h>
#include <sys/kdebug.h>
#include <sys/signal.h>
+#include <sys/aio_kern.h>
+#include <sys/sysproto.h>
+#include <sys/shm_internal.h> /* shmexec() */
+#include <sys/ubc_internal.h> /* ubc_map() */
+#include <bsm/audit_kernel.h>
+
+#include <mach/mach_types.h>
+#include <mach/task.h>
+#include <mach/thread_act.h>
+#include <mach/vm_map.h>
+#include <mach/mach_vm.h>
#include <mach/vm_param.h>
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
+#include <vm/vm_pager.h>
+#include <vm/vm_kern.h>
+#include <vm/task_working_set.h>
+#include <vm/vm_shared_memory_server.h>
+
+/*
+ * Mach things for which prototypes are unavailable from Mach headers
+ */
+void ipc_task_reset(
+ task_t task);
+
+extern struct savearea *get_user_regs(thread_t);
+
#include <kern/thread.h>
#include <kern/task.h>
-
#include <kern/ast.h>
#include <kern/mach_loader.h>
#include <mach-o/fat.h>
#include <mach-o/loader.h>
#include <machine/vmparam.h>
+#if KTRACE
+#include <sys/ktrace.h>
+#endif
+#include <sys/imgact.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)
+
+int app_profile = 0;
extern vm_map_t bsd_pageable_map;
+extern struct fileops vnops;
#define ROUND_PTR(type, addr) \
(type *)( ( (unsigned)(addr) + 16 - 1) \
& ~(16 - 1) )
+struct image_params; /* Forward */
+static int exec_copyout_strings(struct image_params *imgp, user_addr_t *stackp);
static int load_return_to_errno(load_return_t lrtn);
-int execve(struct proc *p, struct execve_args *uap, register_t *retval);
-static int execargs_alloc(vm_offset_t *addrp);
-static int execargs_free(vm_offset_t addr);
+static int execargs_alloc(struct image_params *imgp);
+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_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, struct proc *p);
+static int copyoutptr(user_addr_t ua, user_addr_t ptr, int ptr_size);
+
+/* XXX forward; should be in headers, but can't be for one reason or another */
+extern int grade_binary(cpu_type_t exectype, cpu_subtype_t execsubtype);
+extern void vfork_return(thread_t th_act,
+ struct proc * p,
+ struct proc *p2,
+ register_t *retval);
+
+
+extern char classichandler[32];
+extern uint32_t classichandler_fsid;
+extern long classichandler_fileid;
-int
-execv(p, args, retval)
- struct proc *p;
- void *args;
- int *retval;
+
+/*
+ * exec_add_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
+ * uio_seg segment where string is located
+ *
+ * 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
+ */
+static int
+exec_add_string(struct image_params *imgp, user_addr_t str, /*uio_seg*/int seg)
{
- ((struct execve_args *)args)->envp = NULL;
- return (execve(p, args, retval));
+ int error = 0;
+
+ do {
+ size_t len = 0;
+ if (imgp->ip_strspace <= 0) {
+ error = E2BIG;
+ break;
+ }
+ if (IS_UIO_SYS_SPACE(seg)) {
+ char *kstr = CAST_DOWN(char *,str); /* SAFE */
+ error = copystr(kstr, imgp->ip_strendp, imgp->ip_strspace, &len);
+ } else {
+ error = copyinstr(str, imgp->ip_strendp, imgp->ip_strspace,
+ &len);
+ }
+ imgp->ip_strendp += len;
+ imgp->ip_strspace -= len;
+ } while (error == ENAMETOOLONG);
+
+ return error;
+}
+
+/*
+ * exec_save_path
+ *
+ * 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
+ * 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.
+ *
+ * Parameters; struct image_params * image parameter block
+ * char * path used to invoke program
+ * uio_seg segment where path is located
+ *
+ * Returns: int 0 Success
+ * !0 Failure: error number
+ * 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
+ *
+ * Note: We have to do this before the initial namei() since in the
+ * path contains symbolic links, namei() will overwrite the
+ * original path buffer contents. If the last symbolic link
+ * resolved was a relative pathname, we would lose the original
+ * "path", which could be an absolute pathname. This might be
+ * unacceptable for dyld.
+ */
+static int
+exec_save_path(struct image_params *imgp, user_addr_t path, /*uio_seg*/int seg)
+{
+ int error;
+ size_t len;
+ char *kpath = CAST_DOWN(char *,path); /* SAFE */
+
+ imgp->ip_strendp = imgp->ip_strings;
+ imgp->ip_strspace = SIZE_IMG_STRSPACE;
+
+ len = MIN(MAXPATHLEN, imgp->ip_strspace);
+
+ switch( seg) {
+ case UIO_USERSPACE32:
+ case UIO_USERSPACE64: /* Same for copyin()... */
+ error = copyinstr(path, imgp->ip_strings, len, &len);
+ break;
+ case UIO_SYSSPACE32:
+ error = copystr(kpath, imgp->ip_strings, len, &len);
+ break;
+ default:
+ error = EFAULT;
+ break;
+ }
+
+ if (!error) {
+ imgp->ip_strendp += len;
+ imgp->ip_strspace -= len;
+ imgp->ip_argv = imgp->ip_strendp;
+ }
+
+ return(error);
+}
+
+
+
+/*
+ * exec_shell_imgact
+ *
+ * Image activator for interpreter scripts. If the image begins with the
+ * characters "#!", then it is an interpreter script. Verify that we are
+ * not already executing in Classic mode, and that the length of the script
+ * line indicating the interpreter is not in excess of the maximum allowed
+ * size. If this is the case, then break out the arguments, if any, which
+ * are separated by white space, and copy them into the argument save area
+ * as if they were provided on the command line before all other arguments.
+ * The line ends when we encounter a comment character ('#') or newline.
+ *
+ * Parameters; struct image_params * image parameter block
+ *
+ * Returns: -1 not an interpreter (keep looking)
+ * -3 Success: interpreter: relookup
+ * >0 Failure: interpreter: error number
+ *
+ * A return value other than -1 indicates subsequent image activators should
+ * not be given the opportunity to attempt to activate the image.
+ */
+static int
+exec_shell_imgact(struct image_params *imgp)
+{
+ char *vdata = imgp->ip_vdata;
+ char *ihp;
+ char *line_endp;
+ char *interp;
+
+ /*
+ * Make sure it's a shell script. If we've already redirected
+ * from an interpreted file once, don't do it again.
+ *
+ * Note: We disallow Classic, since the expectation is that we
+ * may run a Classic interpreter, but not an interpret a Classic
+ * image. This is consistent with historical behaviour.
+ */
+ if (vdata[0] != '#' ||
+ vdata[1] != '!' ||
+ (imgp->ip_flags & IMGPF_INTERPRET) != 0) {
+ return (-1);
+ }
+
+
+ imgp->ip_flags |= IMGPF_INTERPRET;
+
+ /* 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);
+ }
+
+ /* Find the nominal end of the interpreter line */
+ for( ihp = &vdata[2]; *ihp != '\n' && *ihp != '#'; ihp++) {
+ if (ihp >= &vdata[IMG_SHSIZE])
+ return (ENOEXEC);
+ }
+
+ line_endp = ihp;
+ ihp = &vdata[2];
+ /* Skip over leading spaces - until the interpreter name */
+ while ( ihp < line_endp && ((*ihp == ' ') || (*ihp == '\t')))
+ 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;
+
+ /* Empty? */
+ if (line_endp == ihp)
+ return (ENOEXEC);
+
+ /* copy the interpreter name */
+ interp = imgp->ip_interp_name;
+ while ((ihp < line_endp) && (*ihp != ' ') && (*ihp != '\t'))
+ *interp++ = *ihp++;
+ *interp = '\0';
+
+ exec_save_path(imgp, CAST_USER_ADDR_T(imgp->ip_interp_name),
+ UIO_SYSSPACE32);
+
+ ihp = &vdata[2];
+ while (ihp < line_endp) {
+ /* Skip leading whitespace before each argument */
+ while ((*ihp == ' ') || (*ihp == '\t'))
+ ihp++;
+
+ if (ihp >= line_endp)
+ break;
+
+ /* 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++;
+ }
+
+ return (-3);
+}
+
+
+
+/*
+ * exec_fat_imgact
+ *
+ * Image activator for fat 1.0 binaries. If the binary is fat, then we
+ * need to select an image from it internally, and make that the image
+ * we are going to attempt to execute. At present, this consists of
+ * reloading the first page for the image with a first page from the
+ * offset location indicated by the fat header.
+ *
+ * Important: This image activator is byte order neutral.
+ *
+ * Note: If we find an encapsulated binary, we make no assertions
+ * about its validity; instead, we leave that up to a rescan
+ * for an activator to claim it, and, if it is claimed by one,
+ * that activator is responsible for determining validity.
+ */
+static int
+exec_fat_imgact(struct image_params *imgp)
+{
+ struct proc *p = vfs_context_proc(imgp->ip_vfs_context);
+ kauth_cred_t cred = p->p_ucred;
+ struct fat_header *fat_header = (struct fat_header *)imgp->ip_vdata;
+ struct fat_arch fat_arch;
+ int resid, error;
+ load_return_t lret;
+
+ /* Make sure it's a fat binary */
+ if ((fat_header->magic != FAT_MAGIC) &&
+ (fat_header->magic != FAT_CIGAM)) {
+ error = -1;
+ goto bad;
+ }
+
+ /* Look up our preferred architecture in the fat file. */
+ lret = fatfile_getarch_affinity(imgp->ip_vp,
+ (vm_offset_t)fat_header,
+ &fat_arch,
+ (p->p_flag & P_AFFINITY));
+ if (lret != LOAD_SUCCESS) {
+ error = load_return_to_errno(lret);
+ goto bad;
+ }
+
+ /* Read the Mach-O header out of it */
+ error = vn_rdwr(UIO_READ, imgp->ip_vp, imgp->ip_vdata,
+ PAGE_SIZE, fat_arch.offset,
+ UIO_SYSSPACE32, (IO_UNIT|IO_NODELOCKED),
+ cred, &resid, p);
+ if (error) {
+ goto bad;
+ }
+
+ /* Did we read a complete header? */
+ if (resid) {
+ error = EBADEXEC;
+ goto bad;
+ }
+
+ /* Success. Indicate we have identified an encapsulated binary */
+ error = -2;
+ imgp->ip_arch_offset = (user_size_t)fat_arch.offset;
+ imgp->ip_arch_size = (user_size_t)fat_arch.size;
+
+bad:
+ return (error);
+}
+
+/*
+ * exec_mach_imgact
+ *
+ * Image activator for mach-o 1.0 binaries.
+ *
+ * Important: This image activator is NOT byte order neutral.
+ */
+static int
+exec_mach_imgact(struct image_params *imgp)
+{
+ struct mach_header *mach_header = (struct mach_header *)imgp->ip_vdata;
+ kauth_cred_t cred = vfs_context_ucred(imgp->ip_vfs_context);
+ struct proc *p = vfs_context_proc(imgp->ip_vfs_context);
+ int error = 0;
+ int vfexec = 0;
+ task_t task;
+ task_t new_task;
+ thread_t thread;
+ struct uthread *uthread;
+ vm_map_t old_map = VM_MAP_NULL;
+ vm_map_t map;
+ boolean_t clean_regions = FALSE;
+ shared_region_mapping_t initial_region = NULL;
+ load_return_t lret;
+ load_result_t load_result;
+
+ /*
+ * 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.
+ */
+ if ((mach_header->magic != MH_MAGIC) &&
+ (mach_header->magic != MH_MAGIC_64)) {
+ error = -1;
+ goto bad;
+ }
+
+ task = current_task();
+ 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;
+
+ if (!grade_binary(mach_header->cputype, mach_header->cpusubtype)) {
+ error = EBADARCH;
+ goto bad;
+ }
+
+ /*
+ * Copy in arguments/environment from the old process, if the
+ * vector is non-NULL (i.e. exec is not being called from
+ * load_init_program(), as a special case, at system startup).
+ */
+ if (imgp->ip_user_argv != 0LL) {
+ error = exec_extract_strings(imgp);
+ 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));
+
+
+ if (vfexec) {
+ kern_return_t result;
+
+ result = task_create_internal(task, FALSE, &new_task);
+ if (result != KERN_SUCCESS)
+ printf("execve: task_create failed. Code: 0x%x\n", result);
+ p->task = new_task;
+ set_bsdtask_info(new_task, p);
+ if (p->p_nice != 0)
+ resetpriority(p);
+ map = get_task_map(new_task);
+ result = thread_create(new_task, &imgp->ip_vfork_thread);
+ if (result != KERN_SUCCESS)
+ printf("execve: thread_create failed. Code: 0x%x\n", result);
+ /* reset local idea of task, thread, uthread */
+ task = new_task;
+ thread = imgp->ip_vfork_thread;
+ uthread = get_bsdthread_info(thread);
+ } else {
+ map = VM_MAP_NULL;
+ }
+
+ /*
+ * We set these flags here; this is OK, since if we fail after
+ * this point, we have already destroyed the parent process anyway.
+ */
+ if (imgp->ip_flags & IMGPF_IS_64BIT) {
+ task_set_64bit(task, TRUE);
+ p->p_flag |= P_LP64;
+ } else {
+ task_set_64bit(task, FALSE);
+ p->p_flag &= ~P_LP64;
+ }
+
+ /*
+ * Load the Mach-O file.
+ */
+/* LP64 - remove following "if" statement after osfmk/vm/task_working_set.c */
+if((imgp->ip_flags & IMGPF_IS_64BIT) == 0)
+ if(imgp->ip_tws_cache_name) {
+ tws_handle_startup_file(task, kauth_cred_getuid(cred),
+ imgp->ip_tws_cache_name, imgp->ip_vp, &clean_regions);
+ }
+
+ vm_get_shared_region(task, &initial_region);
+
+
+ /*
+ * NOTE: An error after this point indicates we have potentially
+ * destroyed or overwrote some process state while attempting an
+ * execve() following a vfork(), which is an unrecoverable condition.
+ */
+
+ /*
+ * 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.
+ */
+ lret = load_machfile(imgp, mach_header, thread, map, clean_regions, &load_result);
+
+ if (lret != LOAD_SUCCESS) {
+ error = load_return_to_errno(lret);
+ goto badtoolate;
+ }
+
+ /* load_machfile() maps the vnode */
+ (void)ubc_map(imgp->ip_vp, PROT_EXEC);
+
+ /*
+ * deal with set[ug]id.
+ */
+ error = exec_handle_sugid(imgp);
+
+ KNOTE(&p->p_klist, NOTE_EXEC);
+
+ if (!vfexec && (p->p_flag & P_TRACED))
+ psignal(p, SIGTRAP);
+
+ if (error) {
+ goto badtoolate;
+ }
+ vnode_put(imgp->ip_vp);
+ imgp->ip_vp = NULL;
+
+ if (load_result.unixproc &&
+ create_unix_stack(get_task_map(task),
+ load_result.user_stack, load_result.customstack, p)) {
+ error = load_return_to_errno(LOAD_NOSPACE);
+ goto badtoolate;
+ }
+
+ if (vfexec) {
+ uthread->uu_ar0 = (void *)get_user_regs(thread);
+ old_map = vm_map_switch(get_task_map(task));
+ }
+
+ if (load_result.unixproc) {
+ user_addr_t ap;
+
+ /*
+ * Copy the strings area out into the new process address
+ * space.
+ */
+ ap = p->user_stack;
+ error = exec_copyout_strings(imgp, &ap);
+ if (error) {
+ if (vfexec)
+ vm_map_switch(old_map);
+ goto badtoolate;
+ }
+ /* Set the stack */
+ thread_setuserstack(thread, ap);
+ }
+
+ if (load_result.dynlinker) {
+ uint64_t ap;
+
+ /* Adjust the stack */
+ if (imgp->ip_flags & IMGPF_IS_64BIT) {
+ ap = thread_adjuserstack(thread, -8);
+ (void)copyoutptr(load_result.mach_header, ap, 8);
+ } else {
+ ap = thread_adjuserstack(thread, -4);
+ (void)suword(ap, load_result.mach_header);
+ }
+ }
+
+ if (vfexec) {
+ vm_map_switch(old_map);
+ }
+ /* Set the entry point */
+ thread_setentrypoint(thread, load_result.entry_point);
+
+ /* Stop profiling */
+ stopprofclock(p);
+
+ /*
+ * Reset signal state.
+ */
+ execsigs(p, thread);
+
+ /*
+ * Close file descriptors
+ * which specify close-on-exec.
+ */
+ fdexec(p);
+
+ /*
+ * need to cancel async IO requests that can be cancelled and wait for those
+ * already active. MAY BLOCK!
+ */
+ _aio_exec( p );
+
+ /* FIXME: Till vmspace inherit is fixed: */
+ if (!vfexec && p->vm_shm)
+ shmexec(p);
+ /* Clean up the semaphores */
+ semexit(p);
+
+ /*
+ * Remember file name for accounting.
+ */
+ p->p_acflag &= ~AFORK;
+ /* If the translated name isn't NULL, then we want to use
+ * that translated name as the name we show as the "real" name.
+ * Otherwise, use the name passed into exec.
+ */
+ if (0 != imgp->ip_p_comm[0]) {
+ bcopy((caddr_t)imgp->ip_p_comm, (caddr_t)p->p_comm,
+ sizeof(p->p_comm));
+ } else {
+ if (imgp->ip_ndp->ni_cnd.cn_namelen > MAXCOMLEN)
+ imgp->ip_ndp->ni_cnd.cn_namelen = MAXCOMLEN;
+ bcopy((caddr_t)imgp->ip_ndp->ni_cnd.cn_nameptr, (caddr_t)p->p_comm,
+ (unsigned)imgp->ip_ndp->ni_cnd.cn_namelen);
+ p->p_comm[imgp->ip_ndp->ni_cnd.cn_namelen] = '\0';
+ }
+
+ {
+ /* This is for kdebug */
+ long dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4;
+
+ /* Collect the pathname for tracing */
+ kdbg_trace_string(p, &dbg_arg1, &dbg_arg2, &dbg_arg3, &dbg_arg4);
+
+
+
+ if (vfexec)
+ {
+ KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_DATA, 2)) | DBG_FUNC_NONE,
+ p->p_pid ,0,0,0, (unsigned int)thread);
+ KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
+ dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, (unsigned int)thread);
+ }
+ else
+ {
+ KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_DATA, 2)) | DBG_FUNC_NONE,
+ p->p_pid ,0,0,0,0);
+ KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
+ dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0);
+ }
+ }
+
+ p->p_flag &= ~P_CLASSIC;
+
+ /*
+ * mark as execed, wakeup the process that vforked (if any) and tell
+ * it that it now has it's own resources back
+ */
+ p->p_flag |= P_EXEC;
+ if (p->p_pptr && (p->p_flag & P_PPWAIT)) {
+ p->p_flag &= ~P_PPWAIT;
+ wakeup((caddr_t)p->p_pptr);
+ }
+
+ if (vfexec && (p->p_flag & P_TRACED)) {
+ psignal_vfork(p, new_task, thread, SIGTRAP);
+ }
+
+badtoolate:
+ if (vfexec) {
+ task_deallocate(new_task);
+ thread_deallocate(thread);
+ if (error)
+ error = 0;
+ }
+
+bad:
+ return(error);
}
+
+
+
+/*
+ * Our image activator table; this is the table of the image types we are
+ * capable of loading. We list them in order of preference to ensure the
+ * fastest image load speed.
+ *
+ * XXX hardcoded, for now; should use linker sets
+ */
+struct execsw {
+ int (*ex_imgact)(struct image_params *);
+ const char *ex_name;
+} execsw[] = {
+ { exec_mach_imgact, "Mach-o Binary" },
+ { exec_fat_imgact, "Fat Binary" },
+ { exec_shell_imgact, "Interpreter Script" },
+ { NULL, NULL}
+};
+
+
+/*
+ * TODO: Dynamic linker header address on stack is copied via suword()
+ */
/* ARGSUSED */
int
-execve(p, uap, retval)
- register struct proc *p;
- register struct execve_args *uap;
- register_t *retval;
+execve(struct proc *p, struct execve_args *uap, register_t *retval)
{
- register struct ucred *cred = p->p_ucred;
- register struct filedesc *fdp = p->p_fd;
- register nc;
- register char *cp;
- int na, ne, ucp, ap, cc;
- unsigned len;
- int indir;
- char *sharg;
- char *execnamep;
- struct vnode *vp;
- struct vattr vattr;
- struct vattr origvattr;
- vm_offset_t execargs;
+ kauth_cred_t cred = p->p_ucred;
+ struct image_params image_params, *imgp;
+ struct vnode_attr va;
+ struct vnode_attr origva;
struct nameidata nd;
- struct ps_strings ps;
-#define SHSIZE 512
- char cfarg[SHSIZE];
- boolean_t is_fat;
- kern_return_t ret;
- struct mach_header *mach_header;
- struct fat_header *fat_header;
- struct fat_arch fat_arch;
- load_return_t lret;
- load_result_t load_result;
struct uthread *uthread;
- vm_map_t old_map;
- vm_map_t map;
int i;
- union {
- /* #! and name of interpreter */
- char ex_shell[SHSIZE];
- /* Mach-O executable */
- struct mach_header mach_header;
- /* Fat executable */
- struct fat_header fat_header;
- char pad[512];
- } exdata;
int resid, error;
- char *savedpath;
- int savedpathlen = 0;
- vm_offset_t *execargsp;
- char *cpnospace;
task_t task;
- task_t new_task;
- thread_act_t thr_act;
int numthreads;
int vfexec=0;
- unsigned long arch_offset =0;
- unsigned long arch_size = 0;
+ int once = 1; /* save SGUID-ness for interpreted files */
+ char alt_p_comm[sizeof(p->p_comm)] = {0}; /* for Classic */
+ int is_64 = IS_64BIT_PROCESS(p);
+ int seg = (is_64 ? UIO_USERSPACE64 : UIO_USERSPACE32);
+ struct vfs_context context;
+
+ context.vc_proc = p;
+ context.vc_ucred = p->p_ucred; /* XXX must NOT be kauth_cred_get() */
+
+
+ imgp = &image_params;
+
+ /* 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_vfs_context = &context;
+ imgp->ip_flags = (is_64 ? IMGPF_WAS_64BIT : IMGPF_NONE);
+ imgp->ip_tws_cache_name = NULL;
+ imgp->ip_p_comm = alt_p_comm; /* for Classic */
+
+ /*
+ * XXXAUDIT: Currently, we only audit the pathname of the binary.
+ * There may also be poor interaction with dyld.
+ */
task = current_task();
- thr_act = current_act();
- uthread = get_bsdthread_info(thr_act);
+ uthread = get_bsdthread_info(current_thread());
- if (uthread->uu_flag & P_VFORK) {
+ if (uthread->uu_flag & UT_VFORK) {
vfexec = 1; /* Mark in exec */
} else {
if (task != kernel_task) {
if (numthreads <= 0 )
return(EINVAL);
if (numthreads > 1) {
- return(EOPNOTSUPP);
+ return(ENOTSUP);
}
}
}
- error = execargs_alloc(&execargs);
+ error = execargs_alloc(imgp);
if (error)
return(error);
-
- savedpath = execargs;
-
+
/*
- * To support new app package launching for Mac OS X, the dyld
- * needs the first argument to execve() stored on the user stack.
- * Copyin the "path" at the begining of the "execargs" buffer
- * allocated above.
- *
- * We have to do this before namei() because in case of
- * symbolic links, namei() would overwrite the original "path".
- * In case the last symbolic link resolved was a relative pathname
- * we would loose the original "path", which could be an
- * absolute pathname. This might be unacceptable for dyld.
+ * 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.
*/
- /* XXX We could optimize to avoid copyinstr in the namei() */
-
- error = copyinstr(uap->fname, savedpath, MAXPATHLEN, &savedpathlen);
- if (error)
- return (error);
+ error = exec_save_path(imgp, uap->fname, seg);
+ if (error) {
+ execargs_free(imgp);
+ return(error);
+ }
+
/*
- * copyinstr will put in savedpathlen, the count of
- * characters (including NULL) in the path.
+ * No app profiles under chroot
*/
-
- /* Save the name aside for future use */
- execargsp = (vm_offset_t *)((char *)(execargs) + savedpathlen);
-
- NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | SAVENAME,
- UIO_USERSPACE, uap->fname, p);
- if ((error = namei(&nd)))
- goto bad1;
- vp = nd.ni_vp;
- VOP_LEASE(vp, p, p->p_ucred, LEASE_READ);
-
- if ((error = VOP_GETATTR(vp, &origvattr, p->p_ucred, p)))
+ if((p->p_fd->fd_rdir == NULLVP) && (app_profile != 0)) {
+
+ /* grab the name of the file out of its path */
+ /* we will need this for lookup within the */
+ /* name file */
+ /* Scan backwards for the first '/' or start of string */
+ imgp->ip_tws_cache_name = imgp->ip_strendp;
+ while (imgp->ip_tws_cache_name[0] != '/') {
+ if(imgp->ip_tws_cache_name == imgp->ip_strings) {
+ imgp->ip_tws_cache_name--;
+ break;
+ }
+ imgp->ip_tws_cache_name--;
+ }
+ imgp->ip_tws_cache_name++;
+ }
+ NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
+ seg, uap->fname, imgp->ip_vfs_context);
+
+again:
+ error = namei(&nd);
+ if (error)
goto bad;
+ imgp->ip_ndp = &nd; /* successful namei(); call nameidone() later */
+ imgp->ip_vp = nd.ni_vp; /* if set, need to vnode_put() at some point */
- /* Check mount point */
- if (vp->v_mount->mnt_flag & MNT_NOEXEC) {
- error = EACCES;
+ error = exec_check_permissions(imgp);
+ if (error)
goto bad;
- }
- indir = 0;
- if ((vp->v_mount->mnt_flag & MNT_NOSUID) || (p->p_flag & P_TRACED))
- origvattr.va_mode &= ~(VSUID | VSGID);
-
- *(&vattr) = *(&origvattr);
+ /* Copy; avoid invocation of an interpreter overwriting the original */
+ if (once) {
+ once = 0;
+ origva = va;
+ }
-again:
- error = check_exec_access(p, vp, &vattr);
+ error = vn_rdwr(UIO_READ, imgp->ip_vp, imgp->ip_vdata, PAGE_SIZE, 0,
+ UIO_SYSSPACE32, IO_NODELOCKED, cred, &resid, p);
if (error)
goto bad;
+
+encapsulated_binary:
+ error = -1;
+ for(i = 0; error == -1 && execsw[i].ex_imgact != NULL; i++) {
- /*
- * Read in first few bytes of file for segment sizes, magic number:
- * 407 = plain executable
- * 410 = RO text
- * 413 = demand paged RO text
- * Also an ASCII line beginning with #! is
- * the file name of a ``shell'' and arguments may be prepended
- * to the argument list if given here.
- *
- * SHELL NAMES ARE LIMITED IN LENGTH.
- *
- * ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM
- * THE ASCII LINE.
- */
+ error = (*execsw[i].ex_imgact)(imgp);
- exdata.ex_shell[0] = '\0'; /* for zero length files */
+ switch (error) {
+ /* case -1: not claimed: continue */
+ case -2: /* Encapsulated binary */
+ goto encapsulated_binary;
- error = vn_rdwr(UIO_READ, vp, (caddr_t)&exdata, sizeof (exdata), 0,
- UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, &resid, p);
+ case -3: /* Interpreter */
+ 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);
- if (error)
- goto bad;
-#ifndef lint
- if (resid > sizeof(exdata) - min(sizeof(exdata.mach_header),
- sizeof(exdata.fat_header))
- && exdata.ex_shell[0] != '#') {
+ nd.ni_segflg = UIO_SYSSPACE32;
+ nd.ni_dirp = CAST_USER_ADDR_T(imgp->ip_interp_name);
+ goto again;
+
+ default:
+ break;
+ }
+ }
+
+ /* call out to allow 3rd party notification of exec.
+ * Ignore result of kauth_authorize_fileop call.
+ */
+ if (error == 0 && kauth_authorize_fileop_has_listeners()) {
+ kauth_authorize_fileop(vfs_context_ucred(&context), KAUTH_FILEOP_EXEC,
+ (uintptr_t)nd.ni_vp, 0);
+ }
+
+ /* Image not claimed by any activator? */
+ if (error == -1)
error = ENOEXEC;
- goto bad;
+
+bad:
+ if (imgp->ip_ndp)
+ nameidone(imgp->ip_ndp);
+ if (imgp->ip_vp)
+ vnode_put(imgp->ip_vp);
+ if (imgp->ip_strings)
+ execargs_free(imgp);
+ if (!error && vfexec) {
+ vfork_return(current_thread(), p->p_pptr, p, retval);
+ (void)thread_resume(imgp->ip_vfork_thread);
+ return(0);
}
-#endif /* lint */
- mach_header = &exdata.mach_header;
- fat_header = &exdata.fat_header;
- if (mach_header->magic == MH_MAGIC)
- is_fat = FALSE;
- else if (fat_header->magic == FAT_MAGIC ||
- fat_header->magic == FAT_CIGAM)
- is_fat = TRUE;
- else if (mach_header->magic == MH_CIGAM) {
- error = EBADARCH;
- goto bad;
+ return(error);
+}
+
+
+static int
+copyinptr(user_addr_t froma, user_addr_t *toptr, int ptr_size)
+{
+ int error;
+
+ if (ptr_size == 4) {
+ /* 64 bit value containing 32 bit address */
+ unsigned int i;
+
+ error = copyin(froma, &i, 4);
+ *toptr = CAST_USER_ADDR_T(i); /* SAFE */
} else {
- if (exdata.ex_shell[0] != '#' ||
- exdata.ex_shell[1] != '!' ||
- indir) {
- error = ENOEXEC;
- goto bad;
- }
- cp = &exdata.ex_shell[2]; /* skip "#!" */
- while (cp < &exdata.ex_shell[SHSIZE]) {
- if (*cp == '\t')
- *cp = ' ';
- else if (*cp == '\n') {
- *cp = '\0';
- break;
- }
- cp++;
- }
- if (*cp != '\0') {
- error = ENOEXEC;
- goto bad;
- }
- cp = &exdata.ex_shell[2];
- while (*cp == ' ')
- cp++;
- execnamep = cp;
- while (*cp && *cp != ' ')
- cp++;
- cfarg[0] = '\0';
- cpnospace = cp;
- if (*cp) {
- *cp++ = '\0';
- while (*cp == ' ')
- cp++;
- if (*cp)
- bcopy((caddr_t)cp, (caddr_t)cfarg, SHSIZE);
- }
+ error = copyin(froma, toptr, 8);
+ }
+ return (error);
+}
- /*
- * Support for new app package launching for Mac OS X.
- * We are about to retry the execve() by changing the path to the
- * interpreter name. Need to re-initialize the savedpath and
- * savedpathlen. +1 for NULL.
- */
- savedpathlen = (cpnospace - execnamep + 1);
- error = copystr(execnamep, savedpath, savedpathlen, &savedpathlen);
- if (error)
- goto bad;
- /* Save the name aside for future use */
- execargsp = (vm_offset_t *)((char *)(execargs) + savedpathlen);
-
- indir = 1;
- vput(vp);
- nd.ni_cnd.cn_nameiop = LOOKUP;
- nd.ni_cnd.cn_flags = (nd.ni_cnd.cn_flags & HASBUF) |
- (FOLLOW | LOCKLEAF | SAVENAME);
- nd.ni_segflg = UIO_SYSSPACE;
- nd.ni_dirp = execnamep;
- if ((error = namei(&nd)))
- goto bad1;
- vp = nd.ni_vp;
- VOP_LEASE(vp, p, cred, LEASE_READ);
- if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)))
- goto bad;
- goto again;
+static int
+copyoutptr(user_addr_t ua, user_addr_t ptr, int ptr_size)
+{
+ int error;
+
+ if (ptr_size == 4) {
+ /* 64 bit value containing 32 bit address */
+ unsigned int i = CAST_DOWN(unsigned int,ua); /* SAFE */
+
+ error = copyout(&i, ptr, 4);
+ } else {
+ error = copyout(&ua, ptr, 8);
}
+ return (error);
+}
+
+
+/*
+ * exec_copyout_strings
+ *
+ * Copy out the strings segment to user space. The strings segment is put
+ * on a preinitialized stack frame.
+ *
+ * Parameters: struct image_params * the image parameter block
+ * int * a pointer to the stack offset variable
+ *
+ * Returns: 0 Success
+ * !0 Faiure: errno
+ *
+ * Implicit returns:
+ * (*stackp) The stack offset, modified
+ *
+ * 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).
+ *
+ * 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 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
+ * +-------------+
+ *
+ * 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)
+{
+ struct proc *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 */
+ 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 stack;
+ int stringc = imgp->ip_argc + imgp->ip_envc;
+ int len;
+ int error;
+ int strspace;
+
+ stack = *stackp;
/*
- * Collect arguments on "file" in swap space.
+ * 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).
*/
- na = 0;
- ne = 0;
- nc = 0;
- cc = 0;
+ string_area = stack - (((imgp->ip_strendp - imgp->ip_strings) + ptr_size-1) & ~(ptr_size-1)) - ptr_size;
+ path_area = string_area - (((imgp->ip_argv - imgp->ip_strings) + ptr_size-1) & ~(ptr_size-1));
+ ptr_area = path_area - ((imgp->ip_argc + imgp->ip_envc + 4) * ptr_size) - ptr_size /*argc*/;
+
+ /* Return the initial stack address: the location of argc */
+ *stackp = ptr_area;
+
+ /*
+ * Record the size of the arguments area so that sysctl_procargs()
+ * can return the argument area without having to parse the arguments.
+ */
+ p->p_argc = imgp->ip_argc;
+ p->p_argslen = (int)(stack - path_area);
+
+
/*
* Support for new app package launching for Mac OS X allocates
- * the "path" at the begining.
- * execargs get allocated after that
+ * the "path" at the begining of the imgp->ip_strings buffer.
+ * copy it just before the string area.
*/
- cp = (char *) execargsp; /* running pointer for copy */
+ len = 0;
+ error = copyoutstr(imgp->ip_strings, path_area,
+ (unsigned)(imgp->ip_argv - imgp->ip_strings),
+ (size_t *)&len);
+ if (error)
+ goto bad;
+
+
+ /* 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);
+
/*
- * size of execargs less sizeof "path",
- * a pointer to "path" and a NULL poiter
+ * 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.
*/
- cc = NCARGS - savedpathlen - 2*NBPW;
+
+ /* 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);
+ }
+
+
/*
- * Copy arguments into file in argdev area.
+ * 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.
*/
- if (uap->argp) for (;;) {
- ap = NULL;
- sharg = NULL;
- if (indir && na == 0) {
- sharg = nd.ni_cnd.cn_nameptr;
- ap = (int)sharg;
- uap->argp++; /* ignore argv[0] */
- } else if (indir && (na == 1 && cfarg[0])) {
- sharg = cfarg;
- ap = (int)sharg;
- } else if (indir && (na == 1 || (na == 2 && cfarg[0])))
- ap = (int)uap->fname;
- else if (uap->argp) {
- ap = fuword((caddr_t)uap->argp);
- uap->argp++;
+ 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 (ap == NULL && uap->envp) {
- uap->argp = NULL;
- if ((ap = fuword((caddr_t)uap->envp)) != NULL)
- uap->envp++, ne++;
- }
- if (ap == NULL)
- break;
- na++;
- if (ap == -1) {
- error = EFAULT;
+ if (--stringc < 0)
break;
- }
+
+ /* pointer: argv[n]/env[n] */
+ (void)copyoutptr(string_area, ptr_area, ptr_size);
+
+ /* string : argv[n][]/env[n][] */
do {
- if (nc >= (NCARGS - savedpathlen - 2*NBPW -1)) {
+ if (strspace <= 0) {
error = E2BIG;
break;
}
- if (sharg) {
- error = copystr(sharg, cp, (unsigned)cc, &len);
- sharg += len;
- } else {
- error = copyinstr((caddr_t)ap, cp, (unsigned)cc,
- &len);
- ap += len;
- }
- cp += len;
- nc += len;
- cc -= len;
+ error = copyoutstr(argv, string_area,
+ (unsigned)strspace,
+ (size_t *)&len);
+ string_area += len;
+ argv += len;
+ strspace -= len;
} while (error == ENAMETOOLONG);
- if (error) {
- goto bad;
- }
+ if (error == EFAULT || error == E2BIG)
+ break; /* bad stack - user's problem */
+ ptr_area += ptr_size;
}
- nc = (nc + NBPW-1) & ~(NBPW-1);
+ /* env[n] = NULL */
+ (void)copyoutptr(0LL, ptr_area, ptr_size);
+
+bad:
+ return(error);
+}
+
+
+/*
+ * exec_extract_strings
+ *
+ * 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.
+ *
+ * Parameters: struct image_params * the image parameter block
+ *
+ * Returns: 0 Success
+ * !0 Failure: errno
+ *
+ * Implicit returns;
+ * (imgp->ip_argc) Count of arguments, updated
+ * (imgp->ip_envc) Count of environment strings, updated
+ *
+ *
+ * Notes: The argument and environment vectors are user space pointers
+ * to arrays of user space pointers.
+ */
+static int
+exec_extract_strings(struct image_params *imgp)
+{
+ int error = 0;
+ struct proc *p = vfs_context_proc(imgp->ip_vfs_context);
+ int seg = (IS_64BIT_PROCESS(p) ? UIO_USERSPACE64 : UIO_USERSPACE32);
+ int ptr_size = (imgp->ip_flags & IMGPF_WAS_64BIT) ? 8 : 4;
+ user_addr_t argv = imgp->ip_user_argv;
+ user_addr_t envv = imgp->ip_user_envv;
+
+ /* Now, get rest of arguments */
/*
- * If we have a fat file, find "our" executable.
+ * 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.
*/
- if (is_fat) {
- /*
- * Look up our architecture in the fat file.
- */
- lret = fatfile_getarch(vp, (vm_offset_t)fat_header, &fat_arch);
- if (lret != LOAD_SUCCESS) {
- error = load_return_to_errno(lret);
+ if((imgp->ip_flags & IMGPF_INTERPRET) != 0 && argv != 0LL) {
+ user_addr_t arg;
+
+ 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, seg);
+ if (error)
+ goto bad;
+ imgp->ip_argc++;
}
- /* Read the Mach-O header out of it */
- error = vn_rdwr(UIO_READ, vp, (caddr_t)&exdata.mach_header,
- sizeof (exdata.mach_header),
- fat_arch.offset,
- UIO_SYSSPACE, (IO_UNIT|IO_NODELOCKED), cred, &resid, p);
+ }
- if (error) {
+ while (argv != 0LL) {
+ user_addr_t arg;
+
+ error = copyinptr(argv, &arg, ptr_size);
+ if (error)
goto bad;
- }
- /* Did we read a complete header? */
- if (resid) {
- error = EBADEXEC;
+ argv += ptr_size;
+ if (arg == 0LL) {
+ break;
+ } else if (arg == (user_addr_t)-1) {
+ /* Um... why would it be -1? */
+ error = EFAULT;
goto bad;
}
+ /*
+ * av[n...] = arg[n]
+ */
+ error = exec_add_string(imgp, arg, seg);
+ if (error)
+ goto bad;
+ imgp->ip_argc++;
+ }
+
+ /* Now, get the environment */
+ while (envv != 0LL) {
+ user_addr_t env;
- /* Is what we found a Mach-O executable */
- if (mach_header->magic != MH_MAGIC) {
- error = ENOEXEC;
+ error = copyinptr(envv, &env, ptr_size);
+ if (error)
goto bad;
- }
- arch_offset = fat_arch.offset;
- arch_size = fat_arch.size;
- } else {
+ envv += ptr_size;
+ if (env == 0LL) {
+ break;
+ } else if (env == (user_addr_t)-1) {
+ error = EFAULT;
+ goto bad;
+ }
/*
- * Load the Mach-O file.
- */
- arch_offset = 0;
- arch_size = (u_long)vattr.va_size;
+ * av[n...] = env[n]
+ */
+ error = exec_add_string(imgp, env, seg);
+ if (error)
+ goto bad;
+ imgp->ip_envc++;
}
+bad:
+ return error;
+}
- if (vfexec) {
- kern_return_t result;
- result = task_create_local(task, FALSE, FALSE, &new_task);
- if (result != KERN_SUCCESS)
- printf("execve: task_create failed. Code: 0x%x\n", result);
- p->task = new_task;
- set_bsdtask_info(new_task, p);
- task = new_task;
- map = get_task_map(new_task);
- result = thread_create(new_task, &thr_act);
- if (result != KERN_SUCCESS)
- printf("execve: thread_create failed. Code: 0x%x\n", result);
- uthread = get_bsdthread_info(thr_act);
- } else {
- map = VM_MAP_NULL;
+#define unix_stack_size(p) (p->p_rlimit[RLIMIT_STACK].rlim_cur)
- }
+static int
+exec_check_permissions(struct image_params *imgp)
+{
+ struct vnode *vp = imgp->ip_vp;
+ struct vnode_attr *vap = imgp->ip_vattr;
+ struct proc *p = vfs_context_proc(imgp->ip_vfs_context);
+ int error;
+ kauth_action_t action;
+
+ /* Only allow execution of regular files */
+ if (!vnode_isreg(vp))
+ return (EACCES);
+
+ /* Get the file attributes that we will be using here and elsewhere */
+ VATTR_INIT(vap);
+ VATTR_WANTED(vap, va_uid);
+ VATTR_WANTED(vap, va_gid);
+ VATTR_WANTED(vap, va_mode);
+ VATTR_WANTED(vap, va_fsid);
+ VATTR_WANTED(vap, va_fileid);
+ VATTR_WANTED(vap, va_data_size);
+ if ((error = vnode_getattr(vp, vap, imgp->ip_vfs_context)) != 0)
+ return (error);
/*
- * Load the Mach-O file.
+ * Ensure that at least one execute bit is on - otherwise root
+ * will always succeed, and we don't want to happen unless the
+ * file really is executable.
*/
- VOP_UNLOCK(vp, 0, p);
- lret = load_machfile(vp, mach_header, arch_offset,
- arch_size, &load_result, thr_act, map);
+ if ((vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)
+ return (EACCES);
- if (lret != LOAD_SUCCESS) {
- error = load_return_to_errno(lret);
- goto badtoolate;
- }
+ /* Disallow zero length files */
+ if (vap->va_data_size == 0)
+ return (ENOEXEC);
- /* load_machfile() maps the vnode */
- ubc_map(vp);
+ 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_flag & P_TRACED))
+ vap->va_mode &= ~(VSUID | VSGID);
+
+ /* Check for execute permission */
+ action = KAUTH_VNODE_EXECUTE;
+ /* Traced images must also be readable */
+ if (p->p_flag & P_TRACED)
+ action |= KAUTH_VNODE_READ_DATA;
+ if ((error = vnode_authorize(vp, NULL, action, imgp->ip_vfs_context)) != 0)
+ return (error);
+
+ /* Don't let it run if anyone had it open for writing */
+ if (vp->v_writecount)
+ return (ETXTBSY);
+
+
+ /* XXX May want to indicate to underlying FS that vnode is open */
+
+ return (error);
+}
+
+/*
+ * exec_handle_sugid
+ *
+ * Initially clear the P_SUGID in the process flags; if an SUGID process is
+ * exec'ing a non-SUGID image, then this is the point of no return.
+ *
+ * If the image being activated is SUGI, then replace the credential with a
+ * copy, disable tracing (unless the tracing process is root), reset the
+ * mach task port to revoke it, set the P_SUGID bit,
+ *
+ * If the saved user and group ID will be changing, then make sure it happens
+ * to a new credential, rather than a shared one.
+ *
+ * Set the security token (this is probably obsolete, given that the token
+ * should not technically be separate from the credential itself).
+ *
+ * Parameters: struct image_params * the image parameter block
+ *
+ * Returns: void No failure indication
+ *
+ * Implicit returns:
+ * <process credential> Potentially modified/replaced
+ * <task port> Potentially revoked
+ * <process flags> P_SUGID bit potentially modified
+ * <security token> Potentially modified
+ */
+static int
+exec_handle_sugid(struct image_params *imgp)
+{
+ kauth_cred_t cred = vfs_context_ucred(imgp->ip_vfs_context);
+ struct proc *p = vfs_context_proc(imgp->ip_vfs_context);
+ int i;
+ int error = 0;
+ static struct vnode *dev_null = NULLVP;
- /*
- * deal with set[ug]id.
- */
p->p_flag &= ~P_SUGID;
- if (((origvattr.va_mode & VSUID) != 0 &&
- p->p_ucred->cr_uid != origvattr.va_uid)
- || (origvattr.va_mode & VSGID) != 0 &&
- p->p_ucred->cr_gid != origvattr.va_gid) {
- p->p_ucred = crcopy(cred);
+
+ if (((imgp->ip_origvattr->va_mode & VSUID) != 0 &&
+ kauth_cred_getuid(cred) != imgp->ip_origvattr->va_uid) ||
+ ((imgp->ip_origvattr->va_mode & VSGID) != 0 &&
+ cred->cr_gid != imgp->ip_origvattr->va_gid)) {
#if KTRACE
/*
* If process is being ktraced, turn off - unless
struct vnode *tvp = p->p_tracep;
p->p_tracep = NULL;
p->p_traceflag = 0;
- vrele(tvp);
+ vnode_rele(tvp);
}
#endif
- if (origvattr.va_mode & VSUID)
- p->p_ucred->cr_uid = origvattr.va_uid;
- if (origvattr.va_mode & VSGID)
- p->p_ucred->cr_gid = origvattr.va_gid;
+ /*
+ * Replace the credential with a copy of itself if euid or egid change.
+ */
+ if (imgp->ip_origvattr->va_mode & VSUID) {
+ p->p_ucred = kauth_cred_seteuid(p->p_ucred, imgp->ip_origvattr->va_uid);
+ }
+ if (imgp->ip_origvattr->va_mode & VSGID) {
+ p->p_ucred = kauth_cred_setegid(p->p_ucred, imgp->ip_origvattr->va_gid);
+ }
+
+ /*
+ * Have mach reset the task port. We don't want
+ * anyone who had the task port before a setuid
+ * exec to be able to access/control the task
+ * after.
+ */
+ if (current_task() == p->task)
+ ipc_task_reset(p->task);
- set_security_token(p);
p->p_flag |= P_SUGID;
+ /* Cache the vnode for /dev/null the first time around */
+ if (dev_null == NULLVP) {
+ struct nameidata nd1;
+
+ NDINIT(&nd1, LOOKUP, FOLLOW, UIO_SYSSPACE32,
+ CAST_USER_ADDR_T("/dev/null"),
+ imgp->ip_vfs_context);
+
+ 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
+ */
+ vnode_put(nd1.ni_vp);
+ }
+ }
+
/* Radar 2261856; setuid security hole fix */
/* Patch from OpenBSD: A. Ramesh */
/*
* descriptors in this range which has implied meaning
* to libc.
*/
- for (i = 0; i < 3; i++) {
- extern struct fileops vnops;
- struct nameidata nd1;
- struct file *fp;
- int indx;
+ if (dev_null != NULLVP) {
+ for (i = 0; i < 3; i++) {
+ struct fileproc *fp;
+ int indx;
+
+ if (p->p_fd->fd_ofiles[i] != NULL)
+ continue;
- if (p->p_fd->fd_ofiles[i] == NULL) {
if ((error = falloc(p, &fp, &indx)) != 0)
continue;
- NDINIT(&nd1, LOOKUP, FOLLOW, UIO_SYSSPACE,
- "/dev/null", p);
- if ((error = vn_open(&nd1, FREAD, 0)) != 0) {
- ffree(fp);
- p->p_fd->fd_ofiles[indx] = NULL;
+
+ if ((error = vnode_ref_ext(dev_null, FREAD)) != 0) {
+ fp_free(p, indx, fp);
break;
}
- fp->f_flag = FREAD;
- fp->f_type = DTYPE_VNODE;
- fp->f_ops = &vnops;
- fp->f_data = (caddr_t)nd1.ni_vp;
- VOP_UNLOCK(nd1.ni_vp, 0, p);
- }
- }
- }
- p->p_cred->p_svuid = p->p_ucred->cr_uid;
- p->p_cred->p_svgid = p->p_ucred->cr_gid;
-
- if (!vfexec && (p->p_flag & P_TRACED)) {
- psignal(p, SIGTRAP);
- ast_on(AST_BSD);
- }
-
- if (error) {
- goto badtoolate;
- }
- VOP_LOCK(vp, LK_EXCLUSIVE | LK_RETRY, p);
- vput(vp);
- vp = NULL;
-
- if (load_result.unixproc &&
- create_unix_stack(get_task_map(task),
- load_result.user_stack, load_result.customstack, p)) {
- error = load_return_to_errno(LOAD_NOSPACE);
- goto badtoolate;
- }
-
- if (vfexec) {
- uthread->uu_ar0 = (void *)get_user_regs(thr_act);
- }
-
- /*
- * Copy back arglist if necessary.
- */
-
-
- ucp = p->user_stack;
- if (vfexec) {
- old_map = vm_map_switch(get_task_map(task));
- }
- if (load_result.unixproc) {
- int pathptr;
-
- ucp = ucp - nc - NBPW; /* begining of the STRING AREA */
-
- /*
- * Support for new app package launching for Mac OS X allocates
- * the "path" at the begining of the execargs buffer.
- * copy it just before the string area.
- */
- savedpathlen = (savedpathlen + NBPW-1) & ~(NBPW-1);
- len = 0;
- pathptr = ucp - savedpathlen;
- error = copyoutstr(savedpath, (caddr_t)pathptr,
- (unsigned)savedpathlen, &len);
- if (error) {
- if (vfexec)
- vm_map_switch(old_map);
- goto badtoolate;
- }
-
- /* Save a NULL pointer below it */
- (void) suword((caddr_t)(pathptr - NBPW), 0);
-
- /* Save the pointer to "path" just below it */
- (void) suword((caddr_t)(pathptr - 2*NBPW), pathptr);
- /*
- * na includes arg[] and env[].
- * NBPW for 2 NULL one each ofter arg[argc -1] and env[n]
- * NBPW for argc
- * skip over saved path, NBPW for pointer to path,
- * and NBPW for the NULL after pointer to path.
- */
- ap = ucp - na*NBPW - 3*NBPW - savedpathlen - 2*NBPW;
- uthread->uu_ar0[SP] = ap;
- (void) suword((caddr_t)ap, na-ne); /* argc */
- nc = 0;
- cc = 0;
-
- cp = (char *) execargsp;
- cc = NCARGS - savedpathlen - 2*NBPW;
- ps.ps_argvstr = (char *)ucp; /* first argv string */
- ps.ps_nargvstr = na - ne; /* argc */
- for (;;) {
- ap += NBPW;
- if (na == ne) {
- (void) suword((caddr_t)ap, 0);
- ap += NBPW;
- ps.ps_envstr = (char *)ucp;
- ps.ps_nenvstr = ne;
+ 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;
+
+ proc_fdlock(p);
+ *fdflags(p, indx) &= ~UF_RESERVED;
+ fp_drop(p, indx, fp, 1);
+ proc_fdunlock(p);
}
- if (--na < 0)
- break;
- (void) suword((caddr_t)ap, ucp);
- do {
- error = copyoutstr(cp, (caddr_t)ucp,
- (unsigned)cc, &len);
- ucp += len;
- cp += len;
- nc += len;
- cc -= len;
- } while (error == ENAMETOOLONG);
- if (error == EFAULT)
- break; /* bad stack - user's problem */
+ /*
+ * 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;
}
- (void) suword((caddr_t)ap, 0);
- }
-
- if (load_result.dynlinker) {
- ap = uthread->uu_ar0[SP] -= 4;
- (void) suword((caddr_t)ap, load_result.mach_header);
- }
-
- if (vfexec) {
- vm_map_switch(old_map);
- }
-#if defined(i386) || defined(ppc)
- uthread->uu_ar0[PC] = load_result.entry_point;
-#else
-#error architecture not implemented!
-#endif
-
- /* Stop profiling */
- stopprofclock(p);
-
- /*
- * Reset signal state.
- */
- execsigs(p);
-
- /*
- * Close file descriptors
- * which specify close-on-exec.
- */
- fdexec(p);
- /* FIXME: Till vmspace inherit is fixed: */
- if (p->vm_shm)
- shmexit(p);
-
- /*
- * Remember file name for accounting.
- */
- p->p_acflag &= ~AFORK;
- if (nd.ni_cnd.cn_namelen > MAXCOMLEN)
- nd.ni_cnd.cn_namelen = MAXCOMLEN;
- bcopy((caddr_t)nd.ni_cnd.cn_nameptr, (caddr_t)p->p_comm,
- (unsigned)nd.ni_cnd.cn_namelen);
- p->p_comm[nd.ni_cnd.cn_namelen] = '\0';
-
- {
- /* This is for kdebug */
- long dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4;
-
- /* Collect the pathname for tracing */
- kdbg_trace_string(p, &dbg_arg1, &dbg_arg2, &dbg_arg3, &dbg_arg4);
-
- if (vfexec)
- KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
- dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, getshuttle_thread(thr_act));
- else
- KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
- dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0);
}
/*
- * mark as execed, wakeup the process that vforked (if any) and tell
- * it that it now has it's own resources back
+ * Implement the semantic where the effective user and group become
+ * the saved user and group in exec'ed programs.
*/
- p->p_flag |= P_EXEC;
- if (p->p_pptr && (p->p_flag & P_PPWAIT)) {
- p->p_flag &= ~P_PPWAIT;
- wakeup((caddr_t)p->p_pptr);
- }
-
- if (vfexec && (p->p_flag & P_TRACED)) {
- psignal_vfork(p, new_task, thr_act, SIGTRAP);
- }
+ p->p_ucred = kauth_cred_setsvuidgid(p->p_ucred, kauth_cred_getuid(p->p_ucred), p->p_ucred->cr_gid);
+
+ /* XXX Obsolete; security token should not be separate from cred */
+ set_security_token(p);
-badtoolate:
- if (vfexec) {
- (void) thread_resume(thr_act);
- task_deallocate(new_task);
- act_deallocate(thr_act);
- if (error)
- error = 0;
- }
-bad:
- FREE_ZONE(nd.ni_cnd.cn_pnbuf, nd.ni_cnd.cn_pnlen, M_NAMEI);
- if (vp)
- vput(vp);
-bad1:
- if (execargs)
- execargs_free(execargs);
- if (!error && vfexec) {
- vfork_return(current_act(), p->p_pptr, p, retval);
- return(0);
- }
return(error);
}
-
-#define unix_stack_size(p) (p->p_rlimit[RLIMIT_STACK].rlim_cur)
-
-kern_return_t
-create_unix_stack(map, user_stack, customstack, p)
- vm_map_t map;
- vm_offset_t user_stack;
- int customstack;
- struct proc *p;
+static kern_return_t
+create_unix_stack(vm_map_t map, user_addr_t user_stack, int customstack,
+ struct proc *p)
{
- vm_size_t size;
- vm_offset_t addr;
+ mach_vm_size_t size;
+ mach_vm_offset_t addr;
p->user_stack = user_stack;
if (!customstack) {
- size = round_page(unix_stack_size(p));
- addr = trunc_page(user_stack - size);
- return (vm_allocate(map,&addr, size, FALSE));
+ size = mach_vm_round_page(unix_stack_size(p));
+ addr = mach_vm_trunc_page(user_stack - size);
+ return (mach_vm_allocate(map, &addr, size,
+ VM_MAKE_TAG(VM_MEMORY_STACK) |
+ VM_FLAGS_FIXED));
} else
return(KERN_SUCCESS);
}
#include <sys/reboot.h>
-char init_program_name[128] = "/sbin/mach_init\0";
+static char init_program_name[128] = "/sbin/launchd";
+static const char * other_init = "/sbin/mach_init";
char init_args[128] = "";
void
-load_init_program(p)
- struct proc *p;
+load_init_program(struct proc *p)
{
vm_offset_t init_addr;
- int *old_ap;
char *argv[3];
- int error;
- register_t retval[2];
- struct uthread * ut;
-
- unix_master();
+ int error;
+ register_t retval[2];
error = 0;
if (error && ((boothowto & RB_INITNAME) == 0) &&
(init_attempts == 1)) {
- static char other_init[] = "/etc/mach_init";
printf("Load of %s, errno %d, trying %s\n",
init_program_name, error, other_init);
error = 0;
init_addr = VM_MIN_ADDRESS;
(void) vm_allocate(current_map(), &init_addr,
- PAGE_SIZE, TRUE);
+ PAGE_SIZE, VM_FLAGS_ANYWHERE);
if (init_addr == 0)
init_addr++;
+
(void) copyout((caddr_t) init_program_name,
- (caddr_t) (init_addr),
+ CAST_USER_ADDR_T(init_addr),
(unsigned) sizeof(init_program_name)+1);
argv[0] = (char *) init_addr;
*/
(void) copyout((caddr_t) init_args,
- (caddr_t) (init_addr),
+ CAST_USER_ADDR_T(init_addr),
(unsigned) sizeof(init_args));
argv[1] = (char *) init_addr;
*/
(void) copyout((caddr_t) argv,
- (caddr_t) (init_addr),
+ CAST_USER_ADDR_T(init_addr),
(unsigned) sizeof(argv));
/*
* Set up argument block for fake call to execve.
*/
- init_exec_args.fname = argv[0];
- init_exec_args.argp = (char **) init_addr;
- init_exec_args.envp = 0;
+ 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);
/* So that mach_init task
* is set with uid,gid 0 token
error = execve(p,&init_exec_args,retval);
} while (error);
-
- unix_release();
}
/*
{
switch (lrtn) {
case LOAD_SUCCESS:
- return 0;
+ return 0;
case LOAD_BADARCH:
return EBADARCH;
case LOAD_BADMACHO:
case LOAD_SHLIB:
return ESHLIBVERS;
case LOAD_NOSPACE:
+ case LOAD_RESOURCE:
return ENOMEM;
case LOAD_PROTECT:
return EACCES;
- case LOAD_RESOURCE:
+ case LOAD_ENOENT:
+ return ENOENT;
+ case LOAD_IOERROR:
+ return EIO;
case LOAD_FAILURE:
default:
return EBADEXEC;
}
}
-/*
- * exec_check_access()
- */
-int
-check_exec_access(p, vp, vap)
- struct proc *p;
- struct vnode *vp;
- struct vattr *vap;
-{
- int flag;
- int error;
-
- if (error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p))
- return (error);
- flag = p->p_flag;
- if (flag & P_TRACED) {
- if (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p))
- return (error);
- }
- if (vp->v_type != VREG ||
- (vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)
- return (EACCES);
- return (0);
-}
-
#include <mach/mach_types.h>
#include <mach/vm_prot.h>
#include <mach/semaphore.h>
extern semaphore_t execve_semaphore;
+/*
+ * The block of memory used by the execve arguments. At the same time,
+ * we allocate a page so that we can read in the first page of the image.
+ */
static int
-execargs_alloc(addrp)
- vm_offset_t *addrp;
+execargs_alloc(struct image_params *imgp)
{
kern_return_t kret;
return (EINTR);
}
- kret = kmem_alloc_pageable(bsd_pageable_map, addrp, NCARGS);
- if (kret != KERN_SUCCESS)
+ kret = kmem_alloc_pageable(bsd_pageable_map, (vm_offset_t *)&imgp->ip_strings, NCARGS + PAGE_SIZE);
+ imgp->ip_vdata = imgp->ip_strings + NCARGS;
+ if (kret != KERN_SUCCESS) {
+ semaphore_signal(execve_semaphore);
return (ENOMEM);
-
+ }
return (0);
}
static int
-execargs_free(addr)
- vm_offset_t addr;
+execargs_free(struct image_params *imgp)
{
kern_return_t kret;
- kmem_free(bsd_pageable_map, addr, NCARGS);
+ 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) {
return (EINVAL);
}
}
-
projects / apple / xnu.git / blobdiff