* 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.
#include <kern/affinity.h>
#include <kern/assert.h>
#include <kern/task.h>
+#include <kern/coalition.h>
#if CONFIG_MACF
#include <security/mac.h>
#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, thread_t, int, struct __kern_sigaction *, boolean_t in_sigstart);
extern void proc_apply_task_networkbg_internal(proc_t, thread_t);
/*
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>
* activator in exec_activate_image() before treating
* it as malformed/corrupt.
*/
-#define EAI_ITERLIMIT 10
+#define EAI_ITERLIMIT 3
/*
* For #! interpreter parsing
extern vm_map_t bsd_pageable_map;
extern const struct fileops vnops;
-#define ROUND_PTR(type, addr) \
- (type *)( ( (uintptr_t)(addr) + 16 - 1) \
- & ~(16 - 1) )
+#define USER_ADDR_ALIGN(addr, val) \
+ ( ( (user_addr_t)(addr) + (val) - 1) \
+ & ~((val) - 1) )
struct image_params; /* Forward */
static int exec_activate_image(struct image_params *imgp);
static void exec_resettextvp(proc_t, struct image_params *);
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, int * need_portwatch, ipc_port_t * portwatch);
-static errno_t exec_handle_spawnattr_apptype(proc_t p, int psa_apptype);
+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, uint64_t psa_darwin_role,
+ ipc_port_t * portwatch_ports, int portwatch_count);
/*
* exec_add_user_string
return error;
}
+/*
+ * dyld is now passed the executable path as a getenv-like variable
+ * in the same fashion as the stack_guard and malloc_entropy keys.
+ */
+#define EXECUTABLE_KEY "executable_path="
+
/*
* exec_save_path
*
* unacceptable for dyld.
*/
static int
-exec_save_path(struct image_params *imgp, user_addr_t path, int seg)
+exec_save_path(struct image_params *imgp, user_addr_t path, int seg, const char **excpath)
{
int error;
- size_t len;
+ size_t len;
char *kpath;
+ // imgp->ip_strings can come out of a cache, so we need to obliterate the
+ // old path.
+ memset(imgp->ip_strings, '\0', strlen(EXECUTABLE_KEY) + MAXPATHLEN);
+
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);
+ error = copyinstr(path, imgp->ip_strings + strlen(EXECUTABLE_KEY), len, &len);
break;
case UIO_SYSSPACE:
kpath = CAST_DOWN(char *,path); /* SAFE */
- error = copystr(kpath, imgp->ip_strings, len, &len);
+ error = copystr(kpath, imgp->ip_strings + strlen(EXECUTABLE_KEY), len, &len);
break;
default:
error = EFAULT;
}
if (!error) {
+ bcopy(EXECUTABLE_KEY, imgp->ip_strings, strlen(EXECUTABLE_KEY));
+ len += strlen(EXECUTABLE_KEY);
+
imgp->ip_strendp += len;
imgp->ip_strspace -= len;
+
+ if (excpath) {
+ *excpath = imgp->ip_strings + strlen(EXECUTABLE_KEY);
+ }
}
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 PowerPC 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.
+ * Image activator for interpreter scripts. If the image begins with
+ * the characters "#!", then it is an interpreter script. Verify 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
*
/*
* 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 PowerPC, since the expectation is that we
- * may run a PowerPC interpreter, but not an interpret a PowerPC
- * image. This is consistent with historical behaviour.
*/
if (vdata[0] != '#' ||
vdata[1] != '!' ||
return (-1);
}
+ if (imgp->ip_origcputype != 0) {
+ /* Fat header previously matched, don't allow shell script inside */
+ return (-1);
+ }
+
imgp->ip_flags |= IMGPF_INTERPRET;
imgp->ip_interp_sugid_fd = -1;
imgp->ip_interp_buffer[0] = '\0';
exec_reset_save_path(imgp);
exec_save_path(imgp, CAST_USER_ADDR_T(imgp->ip_interp_buffer),
- UIO_SYSSPACE);
+ UIO_SYSSPACE, NULL);
/* Copy the entire interpreter + args for later processing into argv[] */
interp = imgp->ip_interp_buffer;
int resid, error;
load_return_t lret;
+ if (imgp->ip_origcputype != 0) {
+ /* Fat header previously matched, don't allow another fat file inside */
+ return (-1);
+ }
+
/* Make sure it's a fat binary */
- if ((fat_header->magic != FAT_MAGIC) &&
- (fat_header->magic != FAT_CIGAM)) {
- error = -1;
+ if (OSSwapBigToHostInt32(fat_header->magic) != FAT_MAGIC) {
+ error = -1; /* not claimed */
+ goto bad;
+ }
+
+ /* imgp->ip_vdata has PAGE_SIZE, zerofilled if the file is smaller */
+ lret = fatfile_validate_fatarches((vm_offset_t)fat_header, PAGE_SIZE);
+ if (lret != LOAD_SUCCESS) {
+ error = load_return_to_errno(lret);
goto bad;
}
/* If posix_spawn binprefs exist, respect those prefs. */
psa = (struct _posix_spawnattr *) imgp->ip_px_sa;
if (psa != NULL && psa->psa_binprefs[0] != 0) {
- struct fat_arch *arches = (struct fat_arch *) (fat_header + 1);
- int nfat_arch = 0, pr = 0, f = 0;
+ uint32_t pr = 0;
- nfat_arch = OSSwapBigToHostInt32(fat_header->nfat_arch);
/* Check each preference listed against all arches in header */
for (pr = 0; pr < NBINPREFS; pr++) {
cpu_type_t pref = psa->psa_binprefs[pr];
if (pref == CPU_TYPE_ANY) {
/* Fall through to regular grading */
- break;
+ goto regular_grading;
}
- for (f = 0; f < nfat_arch; f++) {
- cpu_type_t archtype = OSSwapBigToHostInt32(
- arches[f].cputype);
- cpu_type_t archsubtype = OSSwapBigToHostInt32(
- arches[f].cpusubtype) & ~CPU_SUBTYPE_MASK;
- if (pref == archtype &&
- grade_binary(archtype, archsubtype)) {
- /* We have a winner! */
- fat_arch.cputype = archtype;
- fat_arch.cpusubtype = archsubtype;
- fat_arch.offset = OSSwapBigToHostInt32(
- arches[f].offset);
- fat_arch.size = OSSwapBigToHostInt32(
- arches[f].size);
- fat_arch.align = OSSwapBigToHostInt32(
- arches[f].align);
- goto use_arch;
- }
+ lret = fatfile_getbestarch_for_cputype(pref,
+ (vm_offset_t)fat_header,
+ PAGE_SIZE,
+ &fat_arch);
+ if (lret == LOAD_SUCCESS) {
+ goto use_arch;
}
}
+
+ /* Requested binary preference was not honored */
+ error = EBADEXEC;
+ goto bad;
}
+regular_grading:
/* 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));
+ lret = fatfile_getbestarch((vm_offset_t)fat_header,
+ PAGE_SIZE,
+ &fat_arch);
if (lret != LOAD_SUCCESS) {
error = load_return_to_errno(lret);
goto bad;
goto bad;
}
- /* Did we read a complete header? */
if (resid) {
- error = EBADEXEC;
- goto bad;
+ memset(imgp->ip_vdata + (PAGE_SIZE - resid), 0x0, resid);
}
/* 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;
+ imgp->ip_origcputype = fat_arch.cputype;
+ imgp->ip_origcpusubtype = fat_arch.cpusubtype;
bad:
kauth_cred_unref(&cred);
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 spawn = (imgp->ip_flags & IMGPF_SPAWN);
+ int vfexec = (imgp->ip_flags & IMGPF_VFORK_EXEC);
+ int p_name_len;
/*
* make sure it's a Mach-O 1.0 or Mach-O 2.0 binary; the difference
goto bad;
}
- switch (mach_header->filetype) {
- case MH_DYLIB:
- case MH_BUNDLE:
+ if (mach_header->filetype != MH_EXECUTE) {
error = -1;
goto bad;
}
- if (!imgp->ip_origcputype) {
+ if (imgp->ip_origcputype != 0) {
+ /* Fat header previously had an idea about this thin file */
+ if (imgp->ip_origcputype != mach_header->cputype ||
+ imgp->ip_origcpusubtype != mach_header->cpusubtype) {
+ error = EBADARCH;
+ goto bad;
+ }
+ } else {
imgp->ip_origcputype = mach_header->cputype;
imgp->ip_origcpusubtype = mach_header->cpusubtype;
}
thread = current_thread();
uthread = get_bsdthread_info(thread);
- /*
- * Save off the vfexec state up front; we have to do this, because
- * we need to know if we were in this state initially subsequent to
- * creating the backing task, thread, and uthread for the child
- * process (from the vfs_context_t from in img_parms).
- */
- 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 (vfexec || spawn) {
if (vfexec) {
- imgp->ip_new_thread = fork_create_child(task, p, FALSE, (imgp->ip_flags & IMGPF_IS_64BIT));
+ imgp->ip_new_thread = fork_create_child(task, NULL, p, FALSE, (imgp->ip_flags & IMGPF_IS_64BIT));
if (imgp->ip_new_thread == NULL) {
error = ENOMEM;
goto bad;
* NOTE: An error after this point indicates we have potentially
* 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.
*/
/*
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);
/*
if (load_result.csflags & CS_VALID) {
imgp->ip_csflags |= load_result.csflags &
(CS_VALID|
- CS_HARD|CS_KILL|CS_ENFORCEMENT|
+ CS_HARD|CS_KILL|CS_RESTRICT|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_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;
/*
* deal with set[ug]id.
*/
error = exec_handle_sugid(imgp);
+ if (error) {
+ goto badtoolate;
+ }
+
+ /*
+ * 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 (error) {
- goto badtoolate;
- }
-
if (load_result.unixproc &&
create_unix_stack(get_task_map(task),
&load_result,
error = copyoutptr(load_result.mach_header, ap, new_ptr_size);
if (error) {
- if (vfexec || spawn)
- 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,
* 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.
+
+ /*
+ * Set p->p_comm and p->p_name to the name passed to 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';
- }
+ p_name_len = sizeof(p->p_name) - 1;
+ if(imgp->ip_ndp->ni_cnd.cn_namelen > p_name_len)
+ imgp->ip_ndp->ni_cnd.cn_namelen = p_name_len;
+ bcopy((caddr_t)imgp->ip_ndp->ni_cnd.cn_nameptr, (caddr_t)p->p_name,
+ (unsigned)imgp->ip_ndp->ni_cnd.cn_namelen);
+ p->p_name[imgp->ip_ndp->ni_cnd.cn_namelen] = '\0';
+
+ 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';
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
*/
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 || spawn) {
- KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_DATA, 2)) | DBG_FUNC_NONE,
+ KERNEL_DEBUG_CONSTANT1(TRACE_DATA_EXEC | DBG_FUNC_NONE,
p->p_pid ,0,0,0, (uintptr_t)thread_tid(thread));
- KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
+ KERNEL_DEBUG_CONSTANT1(TRACE_STRING_EXEC | DBG_FUNC_NONE,
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,
+ KERNEL_DEBUG_CONSTANT(TRACE_DATA_EXEC | DBG_FUNC_NONE,
p->p_pid ,0,0,0,0);
- KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
+ KERNEL_DEBUG_CONSTANT(TRACE_STRING_EXEC | DBG_FUNC_NONE,
dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0);
}
}
- /*
- * Ensure the 'translated' and 'affinity' flags are cleared, since we
- * no longer run PowerPC binaries.
- */
- OSBitAndAtomic(~((uint32_t)(P_TRANSLATED | P_AFFINITY)), &p->p_flag);
-
/*
* If posix_spawned with the START_SUSPENDED flag, stop the
* process before it runs.
proc_lock(p);
p->p_stat = SSTOP;
proc_unlock(p);
- (void) task_suspend(p->task);
+ (void) task_suspend_internal(p->task);
}
}
- /*
- * Apply the apptype state (which primes the task for importance donation)
- * This must be done after the exec so that the child's thread is ready
- */
- if (imgp->ip_px_sa != NULL) {
- psa = (struct _posix_spawnattr *) imgp->ip_px_sa;
- exec_handle_spawnattr_apptype(p, psa->psa_apptype);
- }
-
/*
* mark as execed, wakeup the process that vforked (if any) and tell
* it that it now has its own resources back
psignal_vfork(p, new_task, thread, SIGTRAP);
}
+ goto done;
+
badtoolate:
-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);
+ /* Don't allow child process to execute any instructions */
+ if (!spawn) {
+ if (vfexec) {
+ psignal_vfork(p, new_task, thread, SIGKILL);
+ } else {
+ psignal(p, SIGKILL);
+ }
- if (vfexec || spawn) {
+ /* 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);
+ }
+
+ /* 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:
static int
exec_activate_image(struct image_params *imgp)
{
- struct nameidata nd;
+ struct nameidata *ndp = NULL;
+ const char *excpath;
int error;
int resid;
int once = 1; /* save SGUID-ness for interpreted files */
int i;
- int iterlimit = EAI_ITERLIMIT;
+ int itercount = 0;
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
error = execargs_alloc(imgp);
if (error)
goto bad_notrans;
- error = exec_save_path(imgp, imgp->ip_user_fname, imgp->ip_seg);
+ error = exec_save_path(imgp, imgp->ip_user_fname, imgp->ip_seg, &excpath);
if (error) {
goto bad_notrans;
}
- /* Use imgp->ip_strings, which contains the copyin-ed exec path */
- DTRACE_PROC1(exec, uintptr_t, imgp->ip_strings);
+ /* Use excpath, which contains the copyin-ed exec path */
+ DTRACE_PROC1(exec, uintptr_t, excpath);
+
+ MALLOC(ndp, struct nameidata *, sizeof(*ndp), M_TEMP, M_WAITOK | M_ZERO);
+ if (ndp == NULL) {
+ error = ENOMEM;
+ goto bad_notrans;
+ }
- NDINIT(&nd, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
- UIO_SYSSPACE, CAST_USER_ADDR_T(imgp->ip_strings), imgp->ip_vfs_context);
+ NDINIT(ndp, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(excpath), 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 */
/*
* Before we start the transition from binary A to binary B, make
proc_unlock(p);
goto bad_notrans;
}
- error = proc_transstart(p, 1);
+ error = proc_transstart(p, 1, 0);
proc_unlock(p);
if (error)
goto bad_notrans;
&resid, vfs_context_proc(imgp->ip_vfs_context));
if (error)
goto bad;
-
+
+ if (resid) {
+ memset(imgp->ip_vdata + (PAGE_SIZE - resid), 0x0, resid);
+ }
+
encapsulated_binary:
/* Limit the number of iterations we will attempt on each binary */
- if (--iterlimit == 0) {
+ if (++itercount > EAI_ITERLIMIT) {
error = EBADEXEC;
goto bad;
}
switch (error) {
/* case -1: not claimed: continue */
- case -2: /* Encapsulated binary */
+ case -2: /* Encapsulated binary, imgp->ip_XXX set for next iteration */
goto encapsulated_binary;
case -3: /* Interpreter */
imgp->ip_scriptvp = imgp->ip_vp;
#endif
- nameidone(&nd);
+ nameidone(ndp);
vnode_put(imgp->ip_vp);
imgp->ip_vp = NULL; /* already put */
imgp->ip_ndp = NULL; /* already nameidone */
- /* Use imgp->ip_strings, which exec_shell_imgact reset to the interpreter */
- NDINIT(&nd, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF,
- UIO_SYSSPACE, CAST_USER_ADDR_T(imgp->ip_strings), imgp->ip_vfs_context);
+ /* Use excpath, which exec_shell_imgact reset to the interpreter */
+ NDINIT(ndp, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF,
+ UIO_SYSSPACE, CAST_USER_ADDR_T(excpath), imgp->ip_vfs_context);
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_spawnattr_apptype
+ * exec_handle_spawnattr_policy
*
- * Description: Decode and apply the posix_spawn apptype to the task.
+ * Description: Decode and apply the posix_spawn apptype, qos clamp, and watchport ports to the task.
*
* Parameters: proc_t p process to apply attributes to
* int psa_apptype posix spawn attribute apptype
* Returns: 0 Success
*/
static errno_t
-exec_handle_spawnattr_apptype(proc_t p, int psa_apptype)
+exec_handle_spawnattr_policy(proc_t p, int psa_apptype, uint64_t psa_qos_clamp, uint64_t psa_darwin_role,
+ ipc_port_t * portwatch_ports, int portwatch_count)
{
+ int apptype = TASK_APPTYPE_NONE;
+ int qos_clamp = THREAD_QOS_UNSPECIFIED;
+ int role = TASK_UNSPECIFIED;
+
if ((psa_apptype & POSIX_SPAWN_PROC_TYPE_MASK) != 0) {
- int apptype = TASK_APPTYPE_NONE;
int proctype = psa_apptype & POSIX_SPAWN_PROC_TYPE_MASK;
switch(proctype) {
break;
default:
apptype = TASK_APPTYPE_NONE;
+ /* TODO: Should an invalid value here fail the spawn? */
break;
}
+ }
- proc_set_task_apptype(p->task, apptype);
+ 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;
+ }
+ }
- /* TODO: Should an invalid value here fail the spawn? */
- return (0);
+ if (psa_darwin_role != PRIO_DARWIN_ROLE_DEFAULT) {
+ proc_darwin_role_to_task_role(psa_darwin_role, &role);
+ }
+
+ if (apptype != TASK_APPTYPE_NONE ||
+ qos_clamp != THREAD_QOS_UNSPECIFIED ||
+ role != TASK_UNSPECIFIED) {
+ proc_set_task_spawnpolicy(p->task, apptype, qos_clamp, role,
+ portwatch_ports, portwatch_count);
}
return (0);
* ENOTSUP Illegal posix_spawn attr flag was set
*/
static errno_t
-exec_handle_port_actions(struct image_params *imgp, short psa_flags, int * need_portwatch, ipc_port_t * portwatch_ports)
+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);
errno_t ret = 0;
int i;
- if (need_portwatch != NULL)
- *need_portwatch = 0;
+ *portwatch_present = FALSE;
for (i = 0; i < pacts->pspa_count; i++) {
act = &pacts->pspa_actions[i];
#endif
case PSPA_IMP_WATCHPORTS:
if (portwatch_ports != NULL) {
- if (need_portwatch != NULL)
- *need_portwatch = 1;
+ *portwatch_present = TRUE;
/* hold on to this till end of spawn */
portwatch_ports[i] = port;
ret = 0;
* 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, OP_OPEN, 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 than
}
#endif /* CONFIG_MACF */
+#if CONFIG_COALITIONS
+static inline void spawn_coalitions_release_all(coalition_t coal[COALITION_NUM_TYPES])
+{
+ for (int c = 0; c < COALITION_NUM_TYPES; c++) {
+ if (coal[c]) {
+ coalition_remove_active(coal[c]);
+ coalition_release(coal[c]);
+ }
+ }
+}
+#endif
+
+void
+proc_set_return_wait(proc_t p)
+{
+ proc_lock(p);
+ p->p_lflag |= P_LRETURNWAIT;
+ proc_unlock(p);
+}
+
+void
+proc_clear_return_wait(proc_t p, thread_t child_thread)
+{
+ proc_lock(p);
+
+ p->p_lflag &= ~P_LRETURNWAIT;
+ if (p->p_lflag & P_LRETURNWAITER) {
+ wakeup(&p->p_lflag);
+ }
+
+ proc_unlock(p);
+
+ (void)thread_resume(child_thread);
+}
+
+void
+proc_wait_to_return()
+{
+ proc_t p;
+
+ p = current_proc();
+ proc_lock(p);
+
+ if (p->p_lflag & P_LRETURNWAIT) {
+ p->p_lflag |= P_LRETURNWAITER;
+ do {
+ msleep(&p->p_lflag, &p->p_mlock, 0,
+ "thread_check_setup_complete", NULL);
+ } while (p->p_lflag & P_LRETURNWAIT);
+ p->p_lflag &= ~P_LRETURNWAITER;
+ }
+
+ proc_unlock(p);
+ thread_bootstrap_return();
+}
+
/*
* posix_spawn
*
struct vnode_attr *origvap;
struct uthread *uthread = 0; /* compiler complains if not set to 0*/
int error, sig;
- char alt_p_comm[sizeof(p->p_comm)] = {0}; /* for PowerPC */
int is_64 = IS_64BIT_PROCESS(p);
struct vfs_context context;
struct user__posix_spawn_args_desc px_args;
boolean_t spawn_no_exec = FALSE;
boolean_t proc_transit_set = TRUE;
boolean_t exec_done = FALSE;
- int need_portwatch = 0, portwatch_count = 0;
+ int portwatch_count = 0;
ipc_port_t * portwatch_ports = NULL;
vm_size_t px_sa_offset = offsetof(struct _posix_spawnattr, psa_ports);
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;
+ imgp->ip_reserved = NULL;
if (uap->adesc != USER_ADDR_NULL) {
if(is_64) {
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);
+ px_args.coal_info_size = px_args32.coal_info_size;
+ px_args.coal_info = CAST_USER_ADDR_T(px_args32.coal_info);
+ px_args.reserved = 0;
+ px_args.reserved_size = 0;
}
if (error)
goto bad;
/*
* 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, px_sa_offset) != 0))
goto bad;
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)
* and execve().
*/
if (imgp->ip_px_sa == NULL || !(px_sa.psa_flags & POSIX_SPAWN_SETEXEC)){
- if ((error = fork1(p, &imgp->ip_new_thread, PROC_CREATE_SPAWN)) != 0)
+
+ /* Set the new task's coalition, if it is requested. */
+ coalition_t coal[COALITION_NUM_TYPES] = { COALITION_NULL };
+#if CONFIG_COALITIONS
+ int i, ncoals;
+ kern_return_t kr = KERN_SUCCESS;
+ struct _posix_spawn_coalition_info coal_info;
+ int coal_role[COALITION_NUM_TYPES];
+
+ if (imgp->ip_px_sa == NULL || !px_args.coal_info)
+ goto do_fork1;
+
+ memset(&coal_info, 0, sizeof(coal_info));
+
+ if (px_args.coal_info_size > sizeof(coal_info))
+ px_args.coal_info_size = sizeof(coal_info);
+ error = copyin(px_args.coal_info,
+ &coal_info, px_args.coal_info_size);
+ if (error != 0)
goto bad;
+
+ ncoals = 0;
+ for (i = 0; i < COALITION_NUM_TYPES; i++) {
+ uint64_t cid = coal_info.psci_info[i].psci_id;
+ if (cid != 0) {
+ /*
+ * don't allow tasks which are not in a
+ * privileged coalition to spawn processes
+ * into coalitions other than their own
+ */
+ if (!task_is_in_privileged_coalition(p->task, i)) {
+ coal_dbg("ERROR: %d not in privilegd "
+ "coalition of type %d",
+ p->p_pid, i);
+ spawn_coalitions_release_all(coal);
+ error = EPERM;
+ goto bad;
+ }
+
+ coal_dbg("searching for coalition id:%llu", cid);
+ /*
+ * take a reference and activation on the
+ * coalition to guard against free-while-spawn
+ * races
+ */
+ coal[i] = coalition_find_and_activate_by_id(cid);
+ if (coal[i] == COALITION_NULL) {
+ coal_dbg("could not find coalition id:%llu "
+ "(perhaps it has been terminated or reaped)", cid);
+ /*
+ * release any other coalition's we
+ * may have a reference to
+ */
+ spawn_coalitions_release_all(coal);
+ error = ESRCH;
+ goto bad;
+ }
+ if (coalition_type(coal[i]) != i) {
+ coal_dbg("coalition with id:%lld is not of type:%d"
+ " (it's type:%d)", cid, i, coalition_type(coal[i]));
+ error = ESRCH;
+ goto bad;
+ }
+ coal_role[i] = coal_info.psci_info[i].psci_role;
+ ncoals++;
+ }
+ }
+ if (ncoals < COALITION_NUM_TYPES) {
+ /*
+ * If the user is attempting to spawn into a subset of
+ * the known coalition types, then make sure they have
+ * _at_least_ specified a resource coalition. If not,
+ * the following fork1() call will implicitly force an
+ * inheritance from 'p' and won't actually spawn the
+ * new task into the coalitions the user specified.
+ * (also the call to coalitions_set_roles will panic)
+ */
+ if (coal[COALITION_TYPE_RESOURCE] == COALITION_NULL) {
+ spawn_coalitions_release_all(coal);
+ error = EINVAL;
+ goto bad;
+ }
+ }
+do_fork1:
+#endif /* CONFIG_COALITIONS */
+
+ error = fork1(p, &imgp->ip_new_thread, PROC_CREATE_SPAWN, coal);
+
+#if CONFIG_COALITIONS
+ /* set the roles of this task within each given coalition */
+ if (error == 0) {
+ kr = coalitions_set_roles(coal, get_threadtask(imgp->ip_new_thread), coal_role);
+ if (kr != KERN_SUCCESS)
+ error = EINVAL;
+ }
+
+ /* drop our references and activations - fork1() now holds them */
+ spawn_coalitions_release_all(coal);
+#endif /* CONFIG_COALITIONS */
+ if (error != 0) {
+ goto bad;
+ }
imgp->ip_flags |= IMGPF_SPAWN; /* spawn w/o exec */
spawn_no_exec = TRUE; /* used in later tests */
- DTRACE_PROC1(create, proc_t, p);
+
}
- if (spawn_no_exec)
+ 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 */
/* Has spawn port actions? */
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)
}
if ((error = exec_handle_port_actions(imgp,
- imgp->ip_px_sa != NULL ? px_sa.psa_flags : 0, &need_portwatch, portwatch_ports)) != 0)
+ 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 !SECURE_KERNEL
/*
* 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).
+ *
+ * But only do so if we are not embedded + RELEASE.
+ * While embedded allows for a boot-arg (-disable_aslr)
+ * to deal with this (which itself is only honored on
+ * DEVELOPMENT or DEBUG builds of xnu), it is often
+ * useful or necessary to disable ASLR on a per-process
+ * basis for unit testing and debugging.
*/
if (px_sa.psa_flags & _POSIX_SPAWN_DISABLE_ASLR)
OSBitOrAtomic(P_DISABLE_ASLR, &p->p_flag);
+#endif /* !SECURE_KERNEL */
/*
* Forcibly disallow execution from data pages for the spawned process
* Activate the image
*/
error = exec_activate_image(imgp);
-
+
if (error == 0) {
/* process completed the exec */
exec_done = TRUE;
* 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,
+ px_sa.psa_cpumonitor_percent,
+ px_sa.psa_cpumonitor_interval * NSEC_PER_SEC,
0, TRUE);
}
}
bad:
- if (portwatch_ports != NULL) {
- int needboost = 0;
-
- /*
- * Mark the ports as destined to be handed off to the new task, and
- * transfer any boosts to the new task.
- * We need to release the rights even if the posix_spawn has failed.
- */
- if (need_portwatch != 0) {
- for (int i = 0; i < portwatch_count; i++) {
- ipc_port_t port = NULL;
-
- if ((port = portwatch_ports[i]) != NULL) {
- int boost = 0;
- if (error == 0)
- task_add_importance_watchport(p->task, p->p_pid, port, &boost);
- ipc_port_release_send(port);
- needboost += boost;
- }
- }
- }
-
- if (needboost != 0) {
- /*
- * Apply the boost count found on the ports, which will keep the
- * newly created process out of background until it handles the incoming messages.
- */
- task_hold_multiple_assertion(p->task, needboost);
- }
-
- FREE(portwatch_ports, M_TEMP);
- portwatch_ports = NULL;
- portwatch_count = 0;
- }
-
if (error == 0) {
/* reset delay idle sleep status if set */
if ((p->p_flag & P_DELAYIDLESLEEP) == P_DELAYIDLESLEEP)
#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));
+ /*
+ * With 2-level high-water-mark support, POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND is no
+ * longer relevant, as background limits are described via the inactive limit slots.
+ * At the kernel layer, the flag is ignored.
+ *
+ * That said, however, if the POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND is passed in,
+ * we attempt to mimic previous behavior by forcing the BG limit data into the
+ * inactive/non-fatal mode and force the active slots to hold system_wide/fatal mode.
+ * The kernel layer will flag this mapping.
+ */
+ if (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND) {
+ memorystatus_update(p, px_sa.psa_priority, 0,
+ (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_USE_EFFECTIVE_PRIORITY),
+ TRUE,
+ -1, TRUE,
+ px_sa.psa_memlimit_inactive, FALSE,
+ (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND));
+ } else {
+ memorystatus_update(p, px_sa.psa_priority, 0,
+ (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_USE_EFFECTIVE_PRIORITY),
+ TRUE,
+ px_sa.psa_memlimit_active,
+ (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_MEMLIMIT_ACTIVE_FATAL),
+ px_sa.psa_memlimit_inactive,
+ (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_MEMLIMIT_INACTIVE_FATAL),
+ (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND));
+ }
+
}
-#endif
+#endif /* CONFIG_MEMORYSTATUS && CONFIG_JETSAM*/
}
/*
/* 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 if (error == 0) {
+ /* reset the importance attribute from our previous life */
+ task_importance_reset(p->task);
+
+ /* 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, psa->psa_darwin_role,
+ 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;
}
/*
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_px_smpx != NULL)
spawn_free_macpolicyinfo(imgp->ip_px_smpx);
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? */
p->exit_thread = current_thread();
proc_unlock(p);
exit1(p, 1, (int *)NULL);
+ proc_clear_return_wait(p, imgp->ip_new_thread);
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);
+ proc_clear_return_wait(p, imgp->ip_new_thread);
}
} else {
* queue references on them, so we should be fine
* with the delayed resume of the thread here.
*/
- (void)thread_resume(imgp->ip_new_thread);
+ proc_clear_return_wait(p, imgp->ip_new_thread);
}
}
if (bufp != NULL) {
struct vnode_attr *vap;
struct vnode_attr *origvap;
int error;
- 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->ip_origvattr = origvap;
imgp->ip_vfs_context = &context;
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;
+
+ uthread = get_bsdthread_info(current_thread());
+ if (uthread->uu_flag & UT_VFORK) {
+ imgp->ip_flags |= IMGPF_VFORK_EXEC;
+ }
#if CONFIG_MACF
if (uap->mac_p != USER_ADDR_NULL) {
mac_vnode_label_free(imgp->ip_scriptlabelp);
#endif
if (!error) {
- struct uthread *uthread;
-
/* 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);
- uthread = get_bsdthread_info(current_thread());
- 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_new_thread);
+ proc_clear_return_wait(p, imgp->ip_new_thread);
}
} else {
DTRACE_PROC1(exec__failure, int, error);
/* adding the NANO_ENGAGE_KEY key */
if (imgp->ip_px_sa) {
- int proc_type = (((struct _posix_spawnattr *) imgp->ip_px_sa)->psa_apptype) & POSIX_SPAWN_PROC_TYPE_MASK;
+ int proc_flags = (((struct _posix_spawnattr *) imgp->ip_px_sa)->psa_flags);
- if (proc_type == POSIX_SPAWN_PROC_TYPE_APP_DEFAULT || proc_type == POSIX_SPAWN_PROC_TYPE_APP_TAL) {
- char uiapp_string[strlen(NANO_ENGAGE_KEY) + 1];
+ 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++;
- }
+ 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++;
+ }
}
/*
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
int i;
int leave_sugid_clear = 0;
+ int mac_reset_ipc = 0;
int error = 0;
#if CONFIG_MACF
- int mac_transition;
+ int mac_transition, disjoint_cred = 0;
+ int label_update_return = 0;
/*
* Determine whether a call to update the MAC label will result in the
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,
* modifying any others sharing it.
*/
if (mac_transition) {
- kauth_cred_t my_cred;
- if (kauth_proc_label_update_execve(p,
+ kauth_proc_label_update_execve(p,
imgp->ip_vfs_context,
imgp->ip_vp,
+ imgp->ip_arch_offset,
imgp->ip_scriptvp,
imgp->ip_scriptlabelp,
imgp->ip_execlabelp,
- imgp->ip_px_smpx)) {
+ &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
*/
leave_sugid_clear = 0;
}
-
- my_cred = kauth_cred_proc_ref(p);
- mac_task_label_update_cred(my_cred, p->task);
- kauth_cred_unref(&my_cred);
+
+ imgp->ip_mac_return = label_update_return;
}
+
+ 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 */
/*
* So we don't set the P_SUGID or reset mach ports and fds
* on the basis of simply running this code.
*/
- if (!leave_sugid_clear) {
+ 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.
- */
+ * 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((imgp->ip_new_thread != NULL) ?
imgp->ip_new_thread : current_thread());
+ }
+ if (!leave_sugid_clear) {
/*
* Flag the process as setuid.
*/
struct fileproc *fp;
int indx;
int flag;
+ struct nameidata *ndp = NULL;
if (i == 0)
flag = FREAD;
&fp, &indx, imgp->ip_vfs_context)) != 0)
continue;
- struct nameidata nd1;
+ MALLOC(ndp, struct nameidata *, sizeof(*ndp), M_TEMP, M_WAITOK | M_ZERO);
+ if (ndp == NULL) {
+ error = ENOMEM;
+ break;
+ }
- NDINIT(&nd1, LOOKUP, OP_OPEN, FOLLOW, UIO_SYSSPACE,
+ NDINIT(ndp, LOOKUP, OP_OPEN, FOLLOW, UIO_SYSSPACE,
CAST_USER_ADDR_T("/dev/null"),
imgp->ip_vfs_context);
- if ((error = vn_open(&nd1, flag, 0)) != 0) {
+ if ((error = vn_open(ndp, flag, 0)) != 0) {
fp_free(p, indx, fp);
break;
}
fg->fg_flag = flag;
fg->fg_ops = &vnops;
- fg->fg_data = nd1.ni_vp;
+ fg->fg_data = ndp->ni_vp;
- vnode_put(nd1.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);
}
}
}
goto handle_mac_transition;
}
}
+
#endif /* CONFIG_MACF */
/*
#include <sys/reboot.h>
-static char init_program_name[128] = "/sbin/launchd";
-
-struct execve_args init_exec_args;
-
/*
- * load_init_program
+ * load_init_program_at_path
*
* Description: Load the "init" program; in most cases, this will be "launchd"
*
* Parameters: p Process to call execve() to create
* the "init" program
+ * scratch_addr Page in p, scratch space
+ * path NULL terminated path
*
- * Returns: (void)
+ * Returns: KERN_SUCCESS Success
+ * !KERN_SUCCESS See execve/mac_execve for error codes
*
* Notes: The process that is passed in is the first manufactured
* process on the system, and gets here via bsd_ast() firing
* for the first time. This is done to ensure that bsd_init()
* has run to completion.
+ *
+ * The address map of the first manufactured process is 32 bit.
+ * WHEN this becomes 64b, this code will fail; it needs to be
+ * made 64b capable.
*/
-void
-load_init_program(proc_t p)
+static int
+load_init_program_at_path(proc_t p, user_addr_t scratch_addr, const char* path)
{
- vm_offset_t init_addr;
- int argc = 0;
uint32_t argv[3];
- int error;
- int retval[2];
+ uint32_t argc = 0;
+ int retval[2];
+ struct execve_args init_exec_args;
/*
- * Copy out program name.
+ * Validate inputs and pre-conditions
*/
+ assert(p);
+ assert(scratch_addr);
+ assert(path);
- init_addr = VM_MIN_ADDRESS;
- (void) vm_allocate(current_map(), &init_addr, PAGE_SIZE,
- VM_FLAGS_ANYWHERE);
- if (init_addr == 0)
- init_addr++;
+ if (IS_64BIT_PROCESS(p)) {
+ panic("Init against 64b primordial proc not implemented");
+ }
- (void) copyout((caddr_t) init_program_name, CAST_USER_ADDR_T(init_addr),
- (unsigned) sizeof(init_program_name)+1);
+ /*
+ * Copy out program name.
+ */
+ size_t path_length = strlen(path) + 1;
+ (void) copyout(path, scratch_addr, path_length);
- argv[argc++] = (uint32_t)init_addr;
- init_addr += sizeof(init_program_name);
- init_addr = (vm_offset_t)ROUND_PTR(char, init_addr);
+ argv[argc++] = (uint32_t)scratch_addr;
+ scratch_addr = USER_ADDR_ALIGN(scratch_addr + path_length, 16);
/*
* Put out first (and only) argument, similarly.
- * Assumes everything fits in a page as allocated
- * above.
+ * Assumes everything fits in a page as allocated above.
*/
if (boothowto & RB_SINGLE) {
const char *init_args = "-s";
+ size_t init_args_length = strlen(init_args)+1;
- copyout(init_args, CAST_USER_ADDR_T(init_addr),
- strlen(init_args));
-
- argv[argc++] = (uint32_t)init_addr;
- init_addr += strlen(init_args);
- init_addr = (vm_offset_t)ROUND_PTR(char, init_addr);
+ copyout(init_args, scratch_addr, init_args_length);
+ argv[argc++] = (uint32_t)scratch_addr;
+ scratch_addr = USER_ADDR_ALIGN(scratch_addr + init_args_length, 16);
}
/*
/*
* Copy out the argument list.
*/
-
- (void) copyout((caddr_t) argv, CAST_USER_ADDR_T(init_addr),
- (unsigned) sizeof(argv));
+ (void) copyout(argv, scratch_addr, sizeof(argv));
/*
* 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 **)init_addr);
- init_exec_args.envp = CAST_USER_ADDR_T(0);
-
+ init_exec_args.argp = scratch_addr;
+ init_exec_args.envp = USER_ADDR_NULL;
+
/*
- * So that mach_init task is set with uid,gid 0 token
+ * 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",
- init_program_name, error);
+ return execve(p, &init_exec_args, retval);
+}
+
+static const char * init_programs[] = {
+#if DEBUG
+ "/usr/local/sbin/launchd.debug",
+#endif
+#if DEVELOPMENT || DEBUG
+ /* Remove DEBUG conditional when <rdar://problem/17931977> is fixed */
+ "/usr/local/sbin/launchd.development",
+#endif
+ "/sbin/launchd",
+};
+
+/*
+ * load_init_program
+ *
+ * Description: Load the "init" program; in most cases, this will be "launchd"
+ *
+ * Parameters: p Process to call execve() to create
+ * the "init" program
+ *
+ * Returns: (void)
+ *
+ * Notes: The process that is passed in is the first manufactured
+ * process on the system, and gets here via bsd_ast() firing
+ * for the first time. This is done to ensure that bsd_init()
+ * has run to completion.
+ *
+ * In DEBUG & DEVELOPMENT builds, the launchdsuffix boot-arg
+ * may be used to select a specific launchd executable. As with
+ * the kcsuffix boot-arg, setting launchdsuffix to "" or "release"
+ * will force /sbin/launchd to be selected.
+ *
+ * The DEBUG kernel will continue to check for a .development
+ * version until <rdar://problem/17931977> is fixed.
+ *
+ * Search order by build:
+ *
+ * DEBUG DEVELOPMENT RELEASE PATH
+ * ----------------------------------------------------------------------------------
+ * 1 1 NA /usr/local/sbin/launchd.$LAUNCHDSUFFIX
+ * 2 NA NA /usr/local/sbin/launchd.debug
+ * 3 2 NA /usr/local/sbin/launchd.development
+ * 4 3 1 /sbin/launchd
+ */
+void
+load_init_program(proc_t p)
+{
+ uint32_t i;
+ int error;
+ vm_offset_t scratch_addr = VM_MIN_ADDRESS;
+
+ (void) vm_allocate(current_map(), &scratch_addr, PAGE_SIZE, VM_FLAGS_ANYWHERE);
+#if CONFIG_MEMORYSTATUS && CONFIG_JETSAM
+ (void) memorystatus_init_at_boot_snapshot();
+#endif /* CONFIG_MEMORYSTATUS && CONFIG_JETSAM */
+
+#if DEBUG || DEVELOPMENT
+ /* Check for boot-arg suffix first */
+ char launchd_suffix[64];
+ if (PE_parse_boot_argn("launchdsuffix", launchd_suffix, sizeof(launchd_suffix))) {
+ char launchd_path[128];
+ boolean_t is_release_suffix = ((launchd_suffix[0] == 0) ||
+ (strcmp(launchd_suffix, "release") == 0));
+
+ if (is_release_suffix) {
+ error = load_init_program_at_path(p, CAST_USER_ADDR_T(scratch_addr), "/sbin/launchd");
+ if (!error)
+ return;
+
+ panic("Process 1 exec of launchd.release failed, errno %d", error);
+ } else {
+ strlcpy(launchd_path, "/usr/local/sbin/launchd.", sizeof(launchd_path));
+ strlcat(launchd_path, launchd_suffix, sizeof(launchd_path));
+
+ /* All the error data is lost in the loop below, don't
+ * attempt to save it. */
+ if (!load_init_program_at_path(p, CAST_USER_ADDR_T(scratch_addr), launchd_path)) {
+ return;
+ }
+ }
+ }
+#endif
+
+ error = ENOENT;
+ for (i = 0; i < sizeof(init_programs)/sizeof(init_programs[0]); i++) {
+ error = load_init_program_at_path(p, CAST_USER_ADDR_T(scratch_addr), init_programs[i]);
+ if (!error)
+ return;
+ }
+
+ panic("Process 1 exec of %s failed, errno %d", ((i == 0) ? "<null>" : init_programs[i-1]), error);
}
/*
void *blob;
int error;
+ if (cs_debug > 2)
+ csvnode_print_debug(p->p_textvp);
+
+ const int can_skip_taskgated = csproc_get_platform_binary(p) && !csproc_get_platform_path(p);
+ if (can_skip_taskgated) {
+ if (cs_debug) printf("taskgated not required for: %s\n", p->p_name);
+ *require_success = FALSE;
+ return FALSE;
+ }
+
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) {
- *require_success = TRUE; /* fatal on the desktop when entitlements are present */
+ /*
+ * 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;
+ }
+
+ if (cs_debug) printf("taskgated required for: %s\n", p->p_name);
+
return TRUE;
}
*require_success = FALSE;
- return 0;
+ return FALSE;
}
+/*
+ * __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)
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
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)) {
* rpc call, taskgated died, mig server died etc.).
*/
- kr = find_code_signature(port, p->p_pid);
+ kr = __EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__(port, p->p_pid);
switch (kr) {
case KERN_SUCCESS:
error = 0;
if (!unexpected_failure)
p->p_csflags |= CS_KILLED;
/* make very sure execution fails */
- psignal(p, SIGKILL);
+ if (vfexec || spawn) {
+ psignal_vfork(p, p->task, imgp->ip_new_thread, SIGKILL);
+ error = 0;
+ } else {
+ psignal(p, SIGKILL);
+ }
}
return error;
}
projects / apple / xnu.git / blobdiff