#include <machine/reg.h>
#include <machine/cpu_capabilities.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/proc_internal.h>
#include <sys/kauth.h>
#include <sys/user.h>
#include <sys/socketvar.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/mount_internal.h>
#include <sys/vnode_internal.h>
#include <sys/file_internal.h>
#include <sys/stat.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>
#if SYSV_SHM
#include <sys/shm_internal.h>
#endif
#include <sys/ubc_internal.h>
#include <sys/spawn.h>
#include <sys/spawn_internal.h>
#include <sys/process_policy.h>
#include <sys/codesign.h>
#include <crypto/sha1.h>
#include <libkern/libkern.h>
#include <security/audit/audit.h>
#include <ipc/ipc_types.h>
#include <mach/mach_types.h>
#include <mach/port.h>
#include <mach/task.h>
#include <mach/task_access.h>
#include <mach/thread_act.h>
#include <mach/vm_map.h>
#include <mach/mach_vm.h>
#include <mach/vm_param.h>
#include <kern/sched_prim.h>
#include <kern/affinity.h>
#include <kern/assert.h>
#include <kern/task.h>
#include <kern/coalition.h>
#if CONFIG_MACF
#include <security/mac.h>
#include <security/mac_mach_internal.h>
#endif
#include <vm/vm_map.h>
#include <vm/vm_kern.h>
#include <vm/vm_protos.h>
#include <vm/vm_kern.h>
#include <vm/vm_fault.h>
#include <vm/vm_pageout.h>
#include <kdp/kdp_dyld.h>
#include <machine/pal_routines.h>
#include <pexpert/pexpert.h>
#if CONFIG_MEMORYSTATUS
#include <sys/kern_memorystatus.h>
#endif
#if CONFIG_DTRACE
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);
static void (*dtrace_proc_waitfor_hook)(proc_t) = NULL;
#include <sys/dtrace_ptss.h>
#endif
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);
void ipc_task_reset(
task_t task);
void ipc_thread_reset(
thread_t thread);
kern_return_t ipc_object_copyin(
ipc_space_t space,
mach_port_name_t name,
mach_msg_type_name_t msgt_name,
ipc_object_t *objectp);
void ipc_port_release_send(ipc_port_t);
#if DEVELOPMENT || DEBUG
void task_importance_update_owner_info(task_t);
#endif
extern struct savearea *get_user_regs(thread_t);
__attribute__((noinline)) int __EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__(mach_port_t task_access_port, int32_t new_pid);
#include <kern/thread.h>
#include <kern/task.h>
#include <kern/ast.h>
#include <kern/mach_loader.h>
#include <kern/mach_fat.h>
#include <mach-o/fat.h>
#include <mach-o/loader.h>
#include <machine/vmparam.h>
#include <sys/imgact.h>
#include <sys/sdt.h>
#define EAI_ITERLIMIT 10
#define IS_WHITESPACE(ch) ((ch == ' ') || (ch == '\t'))
#define IS_EOL(ch) ((ch == '#') || (ch == '\n'))
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) )
struct image_params;
static int exec_activate_image(struct image_params *imgp);
static int exec_copyout_strings(struct image_params *imgp, user_addr_t *stackp);
static int load_return_to_errno(load_return_t lrtn);
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_add_apple_strings(struct image_params *imgp);
static int exec_handle_sugid(struct image_params *imgp);
static int sugid_scripts = 0;
SYSCTL_INT (_kern, OID_AUTO, sugid_scripts, CTLFLAG_RW | CTLFLAG_LOCKED, &sugid_scripts, 0, "");
static kern_return_t create_unix_stack(vm_map_t map, load_result_t* load_result, proc_t p);
static int copyoutptr(user_addr_t ua, user_addr_t ptr, int ptr_size);
static void exec_resettextvp(proc_t, struct image_params *);
static int check_for_signature(proc_t, struct image_params *);
static void exec_prefault_data(proc_t, struct image_params *, load_result_t *);
static errno_t exec_handle_port_actions(struct image_params *imgp, short psa_flags, boolean_t * portwatch_present, ipc_port_t * portwatch_ports);
static errno_t exec_handle_spawnattr_policy(proc_t p, int psa_apptype, uint64_t psa_qos_clamp,
ipc_port_t * portwatch_ports, int portwatch_count);
static int
exec_add_user_string(struct image_params *imgp, user_addr_t str, int seg, boolean_t is_ncargs)
{
int error = 0;
do {
size_t len = 0;
int space;
if (is_ncargs)
space = imgp->ip_argspace;
else
space = imgp->ip_strspace;
if (space <= 0) {
error = E2BIG;
break;
}
if (!UIO_SEG_IS_USER_SPACE(seg)) {
char *kstr = CAST_DOWN(char *,str);
error = copystr(kstr, imgp->ip_strendp, space, &len);
} else {
error = copyinstr(str, imgp->ip_strendp, space, &len);
}
imgp->ip_strendp += len;
imgp->ip_strspace -= len;
if (is_ncargs)
imgp->ip_argspace -= len;
} while (error == ENAMETOOLONG);
return error;
}
static int
exec_save_path(struct image_params *imgp, user_addr_t path, int seg)
{
int error;
size_t len;
char *kpath;
len = MIN(MAXPATHLEN, imgp->ip_strspace);
switch(seg) {
case UIO_USERSPACE32:
case UIO_USERSPACE64:
error = copyinstr(path, imgp->ip_strings, len, &len);
break;
case UIO_SYSSPACE:
kpath = CAST_DOWN(char *,path);
error = copystr(kpath, imgp->ip_strings, len, &len);
break;
default:
error = EFAULT;
break;
}
if (!error) {
imgp->ip_strendp += len;
imgp->ip_strspace -= len;
}
return(error);
}
static int
exec_reset_save_path(struct image_params *imgp)
{
imgp->ip_strendp = imgp->ip_strings;
imgp->ip_argspace = NCARGS;
imgp->ip_strspace = ( NCARGS + PAGE_SIZE );
return (0);
}
static int
exec_shell_imgact(struct image_params *imgp)
{
char *vdata = imgp->ip_vdata;
char *ihp;
char *line_startp, *line_endp;
char *interp;
proc_t p;
struct fileproc *fp;
int fd;
int error;
if (vdata[0] != '#' ||
vdata[1] != '!' ||
(imgp->ip_flags & IMGPF_INTERPRET) != 0) {
return (-1);
}
imgp->ip_flags |= IMGPF_INTERPRET;
imgp->ip_interp_sugid_fd = -1;
imgp->ip_interp_buffer[0] = '\0';
if (sugid_scripts == 0) {
imgp->ip_origvattr->va_mode &= ~(VSUID | VSGID);
}
for( ihp = &vdata[2]; ihp < &vdata[IMG_SHSIZE]; ihp++ ) {
if (IS_EOL(*ihp)) {
return (ENOEXEC);
} else if (IS_WHITESPACE(*ihp)) {
} else {
break;
}
}
if (ihp == &vdata[IMG_SHSIZE]) {
return (ENOEXEC);
}
line_startp = ihp;
for ( ; ihp < &vdata[IMG_SHSIZE]; ihp++ ) {
if (IS_EOL(*ihp)) {
break;
} else {
}
}
if (ihp == &vdata[IMG_SHSIZE]) {
return (ENOEXEC);
}
while (IS_EOL(*ihp) || IS_WHITESPACE(*ihp)) {
ihp--;
}
line_endp = ihp + 1;
interp = imgp->ip_interp_buffer;
for ( ihp = line_startp; (ihp < line_endp) && !IS_WHITESPACE(*ihp); ihp++)
*interp++ = *ihp;
*interp = '\0';
exec_reset_save_path(imgp);
exec_save_path(imgp, CAST_USER_ADDR_T(imgp->ip_interp_buffer),
UIO_SYSSPACE);
interp = imgp->ip_interp_buffer;
for ( ihp = line_startp; (ihp < line_endp); ihp++)
*interp++ = *ihp;
*interp = '\0';
if (imgp->ip_origvattr->va_mode & (VSUID | VSGID)) {
p = vfs_context_proc(imgp->ip_vfs_context);
error = falloc(p, &fp, &fd, imgp->ip_vfs_context);
if (error)
return(error);
fp->f_fglob->fg_flag = FREAD;
fp->f_fglob->fg_ops = &vnops;
fp->f_fglob->fg_data = (caddr_t)imgp->ip_vp;
proc_fdlock(p);
procfdtbl_releasefd(p, fd, NULL);
fp_drop(p, fd, fp, 1);
proc_fdunlock(p);
vnode_ref(imgp->ip_vp);
imgp->ip_interp_sugid_fd = fd;
}
return (-3);
}
static int
exec_fat_imgact(struct image_params *imgp)
{
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
kauth_cred_t cred = kauth_cred_proc_ref(p);
struct fat_header *fat_header = (struct fat_header *)imgp->ip_vdata;
struct _posix_spawnattr *psa = NULL;
struct fat_arch fat_arch;
int resid, error;
load_return_t lret;
if ((fat_header->magic != FAT_MAGIC) &&
(fat_header->magic != FAT_CIGAM)) {
error = -1;
goto bad;
}
#if DEVELOPMENT || DEBUG
if (cpu_type() == CPU_TYPE_ARM64) {
uint32_t fat_nfat_arch = OSSwapBigToHostInt32(fat_header->nfat_arch);
struct fat_arch *archs;
int vfexec = (imgp->ip_flags & IMGPF_VFORK_EXEC);
int spawn = (imgp->ip_flags & IMGPF_SPAWN);
archs = (struct fat_arch *)(imgp->ip_vdata + sizeof(struct fat_header));
if (PAGE_SIZE >= (sizeof(struct fat_header) + (fat_nfat_arch + 1) * sizeof(struct fat_arch))) {
if (fat_nfat_arch > 0
&& OSSwapBigToHostInt32(archs[fat_nfat_arch].cputype) == CPU_TYPE_ARM64) {
printf("Attempt to execute malformed binary %s\n", imgp->ip_strings);
proc_lock(p);
p->p_csflags |= CS_KILLED;
proc_unlock(p);
if (!vfexec && !spawn) {
psignal(p, SIGKILL);
error = 0;
} else {
error = EBADEXEC;
}
goto bad;
}
}
}
#endif
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;
nfat_arch = OSSwapBigToHostInt32(fat_header->nfat_arch);
for (pr = 0; pr < NBINPREFS; pr++) {
cpu_type_t pref = psa->psa_binprefs[pr];
if (pref == 0) {
error = EBADARCH;
goto bad;
}
if (pref == CPU_TYPE_ANY) {
break;
}
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)) {
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_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;
}
use_arch:
error = vn_rdwr(UIO_READ, imgp->ip_vp, imgp->ip_vdata,
PAGE_SIZE, fat_arch.offset,
UIO_SYSSPACE, (IO_UNIT|IO_NODELOCKED),
cred, &resid, p);
if (error) {
goto bad;
}
if (resid) {
error = EBADEXEC;
goto bad;
}
error = -2;
imgp->ip_arch_offset = (user_size_t)fat_arch.offset;
imgp->ip_arch_size = (user_size_t)fat_arch.size;
bad:
kauth_cred_unref(&cred);
return (error);
}
static int
exec_mach_imgact(struct image_params *imgp)
{
struct mach_header *mach_header = (struct mach_header *)imgp->ip_vdata;
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
int error = 0;
task_t task;
task_t new_task = NULL;
thread_t thread;
struct uthread *uthread;
vm_map_t old_map = VM_MAP_NULL;
vm_map_t map;
load_return_t lret;
load_result_t load_result;
struct _posix_spawnattr *psa = NULL;
int spawn = (imgp->ip_flags & IMGPF_SPAWN);
int vfexec = (imgp->ip_flags & IMGPF_VFORK_EXEC);
if ((mach_header->magic == MH_CIGAM) ||
(mach_header->magic == MH_CIGAM_64)) {
error = EBADARCH;
goto bad;
}
if ((mach_header->magic != MH_MAGIC) &&
(mach_header->magic != MH_MAGIC_64)) {
error = -1;
goto bad;
}
switch (mach_header->filetype) {
case MH_DYLIB:
case MH_BUNDLE:
error = -1;
goto bad;
}
if (!imgp->ip_origcputype) {
imgp->ip_origcputype = mach_header->cputype;
imgp->ip_origcpusubtype = mach_header->cpusubtype;
}
task = current_task();
thread = current_thread();
uthread = get_bsdthread_info(thread);
if ((mach_header->cputype & CPU_ARCH_ABI64) == CPU_ARCH_ABI64)
imgp->ip_flags |= IMGPF_IS_64BIT;
psa = (struct _posix_spawnattr *) imgp->ip_px_sa;
if (psa != NULL && psa->psa_binprefs[0] != 0) {
int pr = 0;
for (pr = 0; pr < NBINPREFS; pr++) {
cpu_type_t pref = psa->psa_binprefs[pr];
if (pref == 0) {
error = EBADARCH;
goto bad;
}
if (pref == CPU_TYPE_ANY) {
goto grade;
}
if (pref == imgp->ip_origcputype) {
goto grade;
}
}
error = EBADARCH;
goto bad;
}
grade:
if (!grade_binary(imgp->ip_origcputype, imgp->ip_origcpusubtype & ~CPU_SUBTYPE_MASK)) {
error = EBADARCH;
goto bad;
}
error = exec_extract_strings(imgp);
if (error)
goto bad;
error = exec_add_apple_strings(imgp);
if (error)
goto bad;
AUDIT_ARG(argv, imgp->ip_startargv, imgp->ip_argc,
imgp->ip_endargv - imgp->ip_startargv);
AUDIT_ARG(envv, imgp->ip_endargv, imgp->ip_envc,
imgp->ip_endenvv - imgp->ip_endargv);
if (vfexec || spawn) {
if (vfexec) {
imgp->ip_new_thread = fork_create_child(task, COALITION_NULL, p, FALSE, (imgp->ip_flags & IMGPF_IS_64BIT));
if (imgp->ip_new_thread == NULL) {
error = ENOMEM;
goto bad;
}
}
thread = imgp->ip_new_thread;
uthread = get_bsdthread_info(thread);
task = new_task = get_threadtask(thread);
map = get_task_map(task);
} else {
map = VM_MAP_NULL;
}
task_set_dyld_info(task, MACH_VM_MIN_ADDRESS, 0);
if (imgp->ip_flags & IMGPF_IS_64BIT) {
task_set_64bit(task, TRUE);
OSBitOrAtomic(P_LP64, &p->p_flag);
} else {
task_set_64bit(task, FALSE);
OSBitAndAtomic(~((uint32_t)P_LP64), &p->p_flag);
}
lret = load_machfile(imgp, mach_header, thread, map, &load_result);
if (lret != LOAD_SUCCESS) {
error = load_return_to_errno(lret);
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_REQUIRE_LV|CS_DYLD_PLATFORM|
CS_EXEC_SET_HARD|CS_EXEC_SET_KILL|CS_EXEC_SET_ENFORCEMENT);
} else {
imgp->ip_csflags &= ~CS_VALID;
}
if (p->p_csflags & CS_EXEC_SET_HARD)
imgp->ip_csflags |= CS_HARD;
if (p->p_csflags & CS_EXEC_SET_KILL)
imgp->ip_csflags |= CS_KILL;
if (p->p_csflags & CS_EXEC_SET_ENFORCEMENT)
imgp->ip_csflags |= CS_ENFORCEMENT;
if (p->p_csflags & CS_EXEC_SET_INSTALLER)
imgp->ip_csflags |= CS_INSTALLER;
vm_map_exec(get_task_map(task),
task,
(void *) p->p_fd->fd_rdir,
cpu_type());
fdexec(p, psa != NULL ? psa->psa_flags : 0);
error = exec_handle_sugid(imgp);
if (error) {
goto badtoolate;
}
if (imgp->ip_new_thread == NULL)
thread_set_mach_voucher(current_thread(), IPC_VOUCHER_NULL);
if (!vfexec && !spawn && (p->p_lflag & P_LTRACED))
psignal(p, SIGTRAP);
if (load_result.unixproc &&
create_unix_stack(get_task_map(task),
&load_result,
p) != KERN_SUCCESS) {
error = load_return_to_errno(LOAD_NOSPACE);
goto badtoolate;
}
if (vfexec || spawn) {
old_map = vm_map_switch(get_task_map(task));
}
if (load_result.unixproc) {
user_addr_t ap;
ap = p->user_stack;
error = exec_copyout_strings(imgp, &ap);
if (error) {
if (vfexec || spawn)
vm_map_switch(old_map);
goto badtoolate;
}
thread_setuserstack(thread, ap);
}
if (load_result.dynlinker) {
uint64_t ap;
int new_ptr_size = (imgp->ip_flags & IMGPF_IS_64BIT) ? 8 : 4;
ap = thread_adjuserstack(thread, -new_ptr_size);
error = copyoutptr(load_result.mach_header, ap, new_ptr_size);
if (error) {
if (vfexec || spawn)
vm_map_switch(old_map);
goto badtoolate;
}
task_set_dyld_info(task, load_result.all_image_info_addr,
load_result.all_image_info_size);
}
exec_prefault_data(p, imgp, &load_result);
if (vfexec || spawn) {
vm_map_switch(old_map);
}
thread_setentrypoint(thread, load_result.entry_point);
stopprofclock(p);
execsigs(p, thread);
_aio_exec( p );
#if SYSV_SHM
if (!vfexec && p->vm_shm)
shmexec(p);
#endif
#if SYSV_SEM
semexit(p);
#endif
p->p_acflag &= ~AFORK;
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';
}
pal_dbg_set_task_name( p->task );
#if DEVELOPMENT || DEBUG
task_importance_update_owner_info(p->task);
#endif
memcpy(&p->p_uuid[0], &load_result.uuid[0], sizeof(p->p_uuid));
#if CONFIG_DTRACE
dtrace_set_thread_predcache(current_thread(), 0);
dtrace_lazy_dofs_destroy(p);
if (p->p_dtrace_helpers != NULL && dtrace_helpers_cleanup) {
(*dtrace_helpers_cleanup)(p);
}
proc_lock(p);
if (p->p_dtrace_probes && dtrace_fasttrap_exec_ptr) {
(*dtrace_fasttrap_exec_ptr)(p);
}
proc_unlock(p);
#endif
if (kdebug_enable) {
long dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4;
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,
p->p_pid ,0,0,0, (uintptr_t)thread_tid(thread));
KERNEL_DEBUG_CONSTANT1((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, (uintptr_t)thread_tid(thread));
} else {
KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_DATA, 2)) | DBG_FUNC_NONE,
p->p_pid ,0,0,0,0);
KERNEL_DEBUG_CONSTANT((TRACEDBG_CODE(DBG_TRACE_STRING, 2)) | DBG_FUNC_NONE,
dbg_arg1, dbg_arg2, dbg_arg3, dbg_arg4, 0);
}
}
OSBitAndAtomic(~((uint32_t)(P_TRANSLATED | P_AFFINITY)), &p->p_flag);
if (imgp->ip_px_sa != NULL) {
psa = (struct _posix_spawnattr *) imgp->ip_px_sa;
if (psa->psa_flags & POSIX_SPAWN_START_SUSPENDED) {
proc_lock(p);
p->p_stat = SSTOP;
proc_unlock(p);
(void) task_suspend(p->task);
}
}
OSBitOrAtomic(P_EXEC, &p->p_flag);
proc_resetregister(p);
if (p->p_pptr && (p->p_lflag & P_LPPWAIT)) {
proc_lock(p);
p->p_lflag &= ~P_LPPWAIT;
proc_unlock(p);
wakeup((caddr_t)p->p_pptr);
}
if (vfexec && (p->p_lflag & P_LTRACED)) {
psignal_vfork(p, new_task, thread, SIGTRAP);
}
goto done;
badtoolate:
if (!spawn) {
if (vfexec) {
psignal_vfork(p, new_task, thread, SIGKILL);
} else {
psignal(p, SIGKILL);
}
error = 0;
}
done:
if (!spawn) {
if ((p->p_lflag & P_LTERM_DECRYPTFAIL) == 0)
proc_knote(p, NOTE_EXEC);
}
if (vfexec || (spawn && error == 0)) {
task_deallocate(new_task);
thread_deallocate(thread);
}
bad:
return(error);
}
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}
};
static int
exec_activate_image(struct image_params *imgp)
{
struct nameidata *ndp = NULL;
int error;
int resid;
int once = 1;
int i;
int iterlimit = EAI_ITERLIMIT;
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);
if (error) {
goto bad_notrans;
}
DTRACE_PROC1(exec, uintptr_t, imgp->ip_strings);
MALLOC(ndp, struct nameidata *, sizeof(*ndp), M_TEMP, M_WAITOK | M_ZERO);
if (ndp == NULL) {
error = ENOMEM;
goto bad_notrans;
}
NDINIT(ndp, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF | AUDITVNPATH1,
UIO_SYSSPACE, CAST_USER_ADDR_T(imgp->ip_strings), imgp->ip_vfs_context);
again:
error = namei(ndp);
if (error)
goto bad_notrans;
imgp->ip_ndp = ndp;
imgp->ip_vp = ndp->ni_vp;
proc_lock(p);
if (p->p_lflag & P_LEXIT) {
proc_unlock(p);
goto bad_notrans;
}
error = proc_transstart(p, 1, 0);
proc_unlock(p);
if (error)
goto bad_notrans;
error = exec_check_permissions(imgp);
if (error)
goto bad;
if (once) {
once = 0;
*imgp->ip_origvattr = *imgp->ip_vattr;
}
error = vn_rdwr(UIO_READ, imgp->ip_vp, imgp->ip_vdata, PAGE_SIZE, 0,
UIO_SYSSPACE, IO_NODELOCKED,
vfs_context_ucred(imgp->ip_vfs_context),
&resid, vfs_context_proc(imgp->ip_vfs_context));
if (error)
goto bad;
encapsulated_binary:
if (--iterlimit == 0) {
error = EBADEXEC;
goto bad;
}
error = -1;
for(i = 0; error == -1 && execsw[i].ex_imgact != NULL; i++) {
error = (*execsw[i].ex_imgact)(imgp);
switch (error) {
case -2:
goto encapsulated_binary;
case -3:
#if CONFIG_MACF
if (imgp->ip_scriptlabelp)
mac_vnode_label_free(imgp->ip_scriptlabelp);
imgp->ip_scriptlabelp = mac_vnode_label_alloc();
if (imgp->ip_scriptlabelp == NULL) {
error = ENOMEM;
break;
}
mac_vnode_label_copy(imgp->ip_vp->v_label,
imgp->ip_scriptlabelp);
if (imgp->ip_scriptvp)
vnode_put(imgp->ip_scriptvp);
if (vnode_getwithref(imgp->ip_vp) == 0)
imgp->ip_scriptvp = imgp->ip_vp;
#endif
nameidone(ndp);
vnode_put(imgp->ip_vp);
imgp->ip_vp = NULL;
imgp->ip_ndp = NULL;
NDINIT(ndp, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF,
UIO_SYSSPACE, CAST_USER_ADDR_T(imgp->ip_strings), imgp->ip_vfs_context);
proc_transend(p, 0);
goto again;
default:
break;
}
}
if (error == 0 && kauth_authorize_fileop_has_listeners()) {
kauth_authorize_fileop(vfs_context_ucred(imgp->ip_vfs_context),
KAUTH_FILEOP_EXEC,
(uintptr_t)ndp->ni_vp, 0);
}
bad:
proc_transend(p, 0);
bad_notrans:
if (imgp->ip_strings)
execargs_free(imgp);
if (imgp->ip_ndp)
nameidone(imgp->ip_ndp);
if (ndp)
FREE(ndp, M_TEMP);
return (error);
}
static errno_t
exec_handle_spawnattr_policy(proc_t p, int psa_apptype, uint64_t psa_qos_clamp,
ipc_port_t * portwatch_ports, int portwatch_count)
{
int apptype = TASK_APPTYPE_NONE;
int qos_clamp = THREAD_QOS_UNSPECIFIED;
if ((psa_apptype & POSIX_SPAWN_PROC_TYPE_MASK) != 0) {
int proctype = psa_apptype & POSIX_SPAWN_PROC_TYPE_MASK;
switch(proctype) {
case POSIX_SPAWN_PROC_TYPE_DAEMON_INTERACTIVE:
apptype = TASK_APPTYPE_DAEMON_INTERACTIVE;
break;
case POSIX_SPAWN_PROC_TYPE_DAEMON_STANDARD:
apptype = TASK_APPTYPE_DAEMON_STANDARD;
break;
case POSIX_SPAWN_PROC_TYPE_DAEMON_ADAPTIVE:
apptype = TASK_APPTYPE_DAEMON_ADAPTIVE;
break;
case POSIX_SPAWN_PROC_TYPE_DAEMON_BACKGROUND:
apptype = TASK_APPTYPE_DAEMON_BACKGROUND;
break;
case POSIX_SPAWN_PROC_TYPE_APP_DEFAULT:
apptype = TASK_APPTYPE_APP_DEFAULT;
break;
case POSIX_SPAWN_PROC_TYPE_APP_TAL:
apptype = TASK_APPTYPE_APP_TAL;
break;
default:
apptype = TASK_APPTYPE_NONE;
break;
}
}
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;
break;
}
}
if (psa_apptype != TASK_APPTYPE_NONE || qos_clamp != THREAD_QOS_UNSPECIFIED) {
proc_set_task_spawnpolicy(p->task, apptype, qos_clamp,
portwatch_ports, portwatch_count);
}
return (0);
}
static errno_t
exec_handle_port_actions(struct image_params *imgp, short psa_flags, boolean_t * portwatch_present, ipc_port_t * portwatch_ports)
{
_posix_spawn_port_actions_t pacts = imgp->ip_px_spa;
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
_ps_port_action_t *act = NULL;
task_t task = p->task;
ipc_port_t port = NULL;
errno_t ret = 0;
int i;
*portwatch_present = FALSE;
for (i = 0; i < pacts->pspa_count; i++) {
act = &pacts->pspa_actions[i];
if (ipc_object_copyin(get_task_ipcspace(current_task()),
act->new_port, MACH_MSG_TYPE_COPY_SEND,
(ipc_object_t *) &port) != KERN_SUCCESS) {
ret = EINVAL;
goto done;
}
switch (act->port_type) {
case PSPA_SPECIAL:
if (!(psa_flags & POSIX_SPAWN_SETEXEC))
ret = ENOTSUP;
else if (task_set_special_port(task,
act->which, port) != KERN_SUCCESS)
ret = EINVAL;
break;
case PSPA_EXCEPTION:
if (!(psa_flags & POSIX_SPAWN_SETEXEC))
ret = ENOTSUP;
else if (task_set_exception_ports(task,
act->mask, port, act->behavior,
act->flavor) != KERN_SUCCESS)
ret = EINVAL;
break;
#if CONFIG_AUDIT
case PSPA_AU_SESSION:
ret = audit_session_spawnjoin(p, port);
break;
#endif
case PSPA_IMP_WATCHPORTS:
if (portwatch_ports != NULL) {
*portwatch_present = TRUE;
portwatch_ports[i] = port;
ret = 0;
} else
ipc_port_release_send(port);
break;
default:
ret = EINVAL;
break;
}
if (ret) {
ipc_port_release_send(port);
break;
}
}
done:
if (0 != ret)
DTRACE_PROC1(spawn__port__failure, mach_port_name_t, act->new_port);
return (ret);
}
static int
exec_handle_file_actions(struct image_params *imgp, short psa_flags)
{
int error = 0;
int action;
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
_posix_spawn_file_actions_t px_sfap = imgp->ip_px_sfa;
int ival[2];
for (action = 0; action < px_sfap->psfa_act_count; action++) {
_psfa_action_t *psfa = &px_sfap->psfa_act_acts[ action];
switch(psfa->psfaa_type) {
case PSFA_OPEN: {
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;
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);
mode = ((mode &~ p->p_fd->fd_cmask) & ALLPERMS) & ~S_ISTXT;
VATTR_SET(vap, va_mode, mode & ACCESSPERMS);
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,
ndp,
psfa->psfaa_openargs.psfao_oflag,
vap,
fileproc_alloc_init, NULL,
ival);
FREE(bufp, M_TEMP);
if (error || ival[0] == psfa->psfaa_filedes)
break;
origfd = ival[0];
dup2a.from = origfd;
dup2a.to = psfa->psfaa_filedes;
error = dup2(p, &dup2a, ival);
if (error)
break;
ca.fd = origfd;
error = close_nocancel(p, &ca, ival);
}
break;
case PSFA_DUP2: {
struct dup2_args dup2a;
dup2a.from = psfa->psfaa_filedes;
dup2a.to = psfa->psfaa_openargs.psfao_oflag;
error = dup2(p, &dup2a, ival);
}
break;
case PSFA_CLOSE: {
struct close_nocancel_args ca;
ca.fd = psfa->psfaa_filedes;
error = close_nocancel(p, &ca, ival);
}
break;
case PSFA_INHERIT: {
struct fcntl_nocancel_args fcntla;
fcntla.fd = psfa->psfaa_filedes;
fcntla.cmd = F_GETFD;
if ((error = fcntl_nocancel(p, &fcntla, ival)) != 0)
break;
if ((ival[0] & FD_CLOEXEC) == FD_CLOEXEC) {
fcntla.fd = psfa->psfaa_filedes;
fcntla.cmd = F_SETFD;
fcntla.arg = ival[0] & ~FD_CLOEXEC;
error = fcntl_nocancel(p, &fcntla, ival);
}
}
break;
default:
error = EINVAL;
break;
}
if (error) {
if (PSFA_OPEN == psfa->psfaa_type) {
DTRACE_PROC1(spawn__open__failure, uintptr_t,
psfa->psfaa_openargs.psfao_path);
} else {
DTRACE_PROC1(spawn__fd__failure, int, psfa->psfaa_filedes);
}
break;
}
}
if (error != 0 || (psa_flags & POSIX_SPAWN_CLOEXEC_DEFAULT) == 0)
return (error);
proc_fdlock(p);
for (action = 0; action < px_sfap->psfa_act_count; action++) {
_psfa_action_t *psfa = &px_sfap->psfa_act_acts[action];
int fd = psfa->psfaa_filedes;
switch (psfa->psfaa_type) {
case PSFA_DUP2:
fd = psfa->psfaa_openargs.psfao_oflag;
case PSFA_OPEN:
case PSFA_INHERIT:
*fdflags(p, fd) |= UF_INHERIT;
break;
case PSFA_CLOSE:
break;
}
}
proc_fdunlock(p);
return (0);
}
#if CONFIG_MACF
void *
exec_spawnattr_getmacpolicyinfo(const void *macextensions, const char *policyname, size_t *lenp)
{
const struct _posix_spawn_mac_policy_extensions *psmx = macextensions;
int i;
if (psmx == NULL)
return NULL;
for (i = 0; i < psmx->psmx_count; i++) {
const _ps_mac_policy_extension_t *extension = &psmx->psmx_extensions[i];
if (strncmp(extension->policyname, policyname, sizeof(extension->policyname)) == 0) {
if (lenp != NULL)
*lenp = extension->datalen;
return extension->datap;
}
}
if (lenp != NULL)
*lenp = 0;
return NULL;
}
static int
spawn_copyin_macpolicyinfo(const struct user__posix_spawn_args_desc *px_args, _posix_spawn_mac_policy_extensions_t *psmxp)
{
_posix_spawn_mac_policy_extensions_t psmx = NULL;
int error = 0;
int copycnt = 0;
int i = 0;
*psmxp = NULL;
if (px_args->mac_extensions_size < PS_MAC_EXTENSIONS_SIZE(1) ||
px_args->mac_extensions_size > PAGE_SIZE) {
error = EINVAL;
goto bad;
}
MALLOC(psmx, _posix_spawn_mac_policy_extensions_t, px_args->mac_extensions_size, M_TEMP, M_WAITOK);
if ((error = copyin(px_args->mac_extensions, psmx, px_args->mac_extensions_size)) != 0)
goto bad;
if (PS_MAC_EXTENSIONS_SIZE(psmx->psmx_count) > px_args->mac_extensions_size) {
error = EINVAL;
goto bad;
}
for (i = 0; i < psmx->psmx_count; i++) {
_ps_mac_policy_extension_t *extension = &psmx->psmx_extensions[i];
if (extension->datalen == 0 || extension->datalen > PAGE_SIZE) {
error = EINVAL;
goto bad;
}
}
for (copycnt = 0; copycnt < psmx->psmx_count; copycnt++) {
_ps_mac_policy_extension_t *extension = &psmx->psmx_extensions[copycnt];
void *data = NULL;
MALLOC(data, void *, extension->datalen, M_TEMP, M_WAITOK);
if ((error = copyin(extension->data, data, extension->datalen)) != 0) {
FREE(data, M_TEMP);
goto bad;
}
extension->datap = data;
}
*psmxp = psmx;
return 0;
bad:
if (psmx != NULL) {
for (i = 0; i < copycnt; i++)
FREE(psmx->psmx_extensions[i].datap, M_TEMP);
FREE(psmx, M_TEMP);
}
return error;
}
static void
spawn_free_macpolicyinfo(_posix_spawn_mac_policy_extensions_t psmx)
{
int i;
if (psmx == NULL)
return;
for (i = 0; i < psmx->psmx_count; i++)
FREE(psmx->psmx_extensions[i].datap, M_TEMP);
FREE(psmx, M_TEMP);
}
#endif
int
posix_spawn(proc_t ap, struct posix_spawn_args *uap, int32_t *retval)
{
proc_t p = ap;
user_addr_t pid = uap->pid;
int ival[2];
char *bufp = NULL;
struct image_params *imgp;
struct vnode_attr *vap;
struct vnode_attr *origvap;
struct uthread *uthread = 0;
int error, sig;
char alt_p_comm[sizeof(p->p_comm)] = {0};
int is_64 = IS_64BIT_PROCESS(p);
struct vfs_context context;
struct user__posix_spawn_args_desc px_args;
struct _posix_spawnattr px_sa;
_posix_spawn_file_actions_t px_sfap = NULL;
_posix_spawn_port_actions_t px_spap = NULL;
struct __kern_sigaction vec;
boolean_t spawn_no_exec = FALSE;
boolean_t proc_transit_set = TRUE;
boolean_t exec_done = FALSE;
int portwatch_count = 0;
ipc_port_t * portwatch_ports = NULL;
vm_size_t px_sa_offset = offsetof(struct _posix_spawnattr, psa_ports);
MALLOC(bufp, char *, (sizeof(*imgp) + sizeof(*vap) + sizeof(*origvap)), M_TEMP, M_WAITOK | M_ZERO);
imgp = (struct image_params *) bufp;
if (bufp == NULL) {
error = ENOMEM;
goto bad;
}
vap = (struct vnode_attr *) (bufp + sizeof(*imgp));
origvap = (struct vnode_attr *) (bufp + sizeof(*imgp) + sizeof(*vap));
imgp->ip_user_fname = uap->path;
imgp->ip_user_argv = uap->argv;
imgp->ip_user_envv = uap->envp;
imgp->ip_vattr = vap;
imgp->ip_origvattr = origvap;
imgp->ip_vfs_context = &context;
imgp->ip_flags = (is_64 ? IMGPF_WAS_64BIT : IMGPF_NONE);
imgp->ip_p_comm = alt_p_comm;
imgp->ip_seg = (is_64 ? UIO_USERSPACE64 : UIO_USERSPACE32);
imgp->ip_mac_return = 0;
if (uap->adesc != USER_ADDR_NULL) {
if(is_64) {
error = copyin(uap->adesc, &px_args, sizeof(px_args));
} else {
struct user32__posix_spawn_args_desc px_args32;
error = copyin(uap->adesc, &px_args32, sizeof(px_args32));
px_args.attr_size = px_args32.attr_size;
px_args.attrp = CAST_USER_ADDR_T(px_args32.attrp);
px_args.file_actions_size = px_args32.file_actions_size;
px_args.file_actions = CAST_USER_ADDR_T(px_args32.file_actions);
px_args.port_actions_size = px_args32.port_actions_size;
px_args.port_actions = CAST_USER_ADDR_T(px_args32.port_actions);
px_args.mac_extensions_size = px_args32.mac_extensions_size;
px_args.mac_extensions = CAST_USER_ADDR_T(px_args32.mac_extensions);
}
if (error)
goto bad;
if (px_args.attr_size != 0) {
if ((error = copyin(px_args.attrp, &px_sa, px_sa_offset) != 0))
goto bad;
bzero( (void *)( (unsigned long) &px_sa + px_sa_offset), sizeof(px_sa) - px_sa_offset );
imgp->ip_px_sa = &px_sa;
}
if (px_args.file_actions_size != 0) {
int maxfa = (p->p_limit ? p->p_rlimit[RLIMIT_NOFILE].rlim_cur : NOFILE);
if (px_args.file_actions_size < PSF_ACTIONS_SIZE(1) ||
px_args.file_actions_size > PSF_ACTIONS_SIZE(maxfa)) {
error = EINVAL;
goto bad;
}
MALLOC(px_sfap, _posix_spawn_file_actions_t, px_args.file_actions_size, M_TEMP, M_WAITOK);
if (px_sfap == NULL) {
error = ENOMEM;
goto bad;
}
imgp->ip_px_sfa = px_sfap;
if ((error = copyin(px_args.file_actions, px_sfap,
px_args.file_actions_size)) != 0)
goto bad;
if (PSF_ACTIONS_SIZE(px_sfap->psfa_act_count) != px_args.file_actions_size) {
error = EINVAL;
goto bad;
}
}
if (px_args.port_actions_size != 0) {
if (px_args.port_actions_size < PS_PORT_ACTIONS_SIZE(1) ||
px_args.port_actions_size > PAGE_SIZE) {
error = EINVAL;
goto bad;
}
MALLOC(px_spap, _posix_spawn_port_actions_t,
px_args.port_actions_size, M_TEMP, M_WAITOK);
if (px_spap == NULL) {
error = ENOMEM;
goto bad;
}
imgp->ip_px_spa = px_spap;
if ((error = copyin(px_args.port_actions, px_spap,
px_args.port_actions_size)) != 0)
goto bad;
if (PS_PORT_ACTIONS_SIZE(px_spap->pspa_count) != px_args.port_actions_size) {
error = EINVAL;
goto bad;
}
}
#if CONFIG_MACF
if (px_args.mac_extensions_size != 0) {
if ((error = spawn_copyin_macpolicyinfo(&px_args, (_posix_spawn_mac_policy_extensions_t *)&imgp->ip_px_smpx)) != 0)
goto bad;
}
#endif
}
uthread = get_bsdthread_info(current_thread());
if (uthread->uu_flag & UT_VFORK) {
error = EINVAL;
goto bad;
}
if (imgp->ip_px_sa == NULL || !(px_sa.psa_flags & POSIX_SPAWN_SETEXEC)){
coalition_t coal = COALITION_NULL;
#if CONFIG_COALITIONS
if (imgp->ip_px_sa) {
uint64_t cid = px_sa.psa_coalitionid;
if (cid != 0) {
#if COALITION_DEBUG
printf("%s: searching for coalition ID %llu\n", __func__, cid);
#endif
coal = coalition_find_and_activate_by_id(cid);
if (coal == COALITION_NULL) {
#if COALITION_DEBUG
printf("%s: could not find coalition ID %llu (perhaps it has been terminated or reaped)\n", __func__, cid);
#endif
error = ESRCH;
goto bad;
}
}
}
#endif
error = fork1(p, &imgp->ip_new_thread, PROC_CREATE_SPAWN, coal);
if (error != 0) {
if (coal != COALITION_NULL) {
#if CONFIG_COALITIONS
coalition_remove_active(coal);
coalition_release(coal);
#endif
}
goto bad;
}
imgp->ip_flags |= IMGPF_SPAWN;
spawn_no_exec = TRUE;
if (coal != COALITION_NULL) {
#if CONFIG_COALITIONS
coalition_remove_active(coal);
coalition_release(coal);
#endif
}
}
if (spawn_no_exec) {
p = (proc_t)get_bsdthreadtask_info(imgp->ip_new_thread);
DTRACE_PROC1(create, proc_t, p);
}
assert(p != NULL);
context.vc_thread = current_thread();
context.vc_ucred = p->p_ucred;
if (spawn_no_exec)
context.vc_thread = imgp->ip_new_thread;
if (imgp->ip_px_sfa != NULL) {
if ((error = exec_handle_file_actions(imgp,
imgp->ip_px_sa != NULL ? px_sa.psa_flags : 0)) != 0)
goto bad;
}
if (imgp->ip_px_spa != NULL) {
boolean_t is_adaptive = FALSE;
boolean_t portwatch_present = FALSE;
if (imgp->ip_px_sa != NULL && px_sa.psa_apptype == POSIX_SPAWN_PROC_TYPE_DAEMON_ADAPTIVE)
is_adaptive = TRUE;
if (px_spap->pspa_count != 0 && is_adaptive) {
portwatch_count = px_spap->pspa_count;
MALLOC(portwatch_ports, ipc_port_t *, (sizeof(ipc_port_t) * portwatch_count), M_TEMP, M_WAITOK | M_ZERO);
} else {
portwatch_ports = NULL;
}
if ((error = exec_handle_port_actions(imgp,
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;
}
}
if (imgp->ip_px_sa != NULL) {
if (px_sa.psa_flags & POSIX_SPAWN_SETPGROUP) {
struct setpgid_args spga;
spga.pid = p->p_pid;
spga.pgid = px_sa.psa_pgroup;
if((error = setpgid(p, &spga, ival)) != 0)
goto bad;
}
if (px_sa.psa_flags & POSIX_SPAWN_RESETIDS) {
kauth_cred_t my_cred = p->p_ucred;
kauth_cred_t my_new_cred = kauth_cred_setuidgid(my_cred, kauth_cred_getruid(my_cred), kauth_cred_getrgid(my_cred));
if (my_new_cred != my_cred) {
p->p_ucred = my_new_cred;
PROC_UPDATE_CREDS_ONPROC(p);
}
}
if (px_sa.psa_flags & _POSIX_SPAWN_DISABLE_ASLR)
OSBitOrAtomic(P_DISABLE_ASLR, &p->p_flag);
if (px_sa.psa_flags & _POSIX_SPAWN_ALLOW_DATA_EXEC)
imgp->ip_flags |= IMGPF_ALLOW_DATA_EXEC;
}
if (p->p_flag & P_DISABLE_ASLR)
imgp->ip_flags |= IMGPF_DISABLE_ASLR;
if (spawn_no_exec) {
proc_transend(p, 0);
proc_transit_set = 0;
}
#if MAC_SPAWN
if (uap->mac_p != USER_ADDR_NULL) {
error = mac_execve_enter(uap->mac_p, imgp);
if (error)
goto bad;
}
#endif
error = exec_activate_image(imgp);
if (error == 0) {
exec_done = TRUE;
} else if (error == -1) {
error = ENOEXEC;
}
if (!error && imgp->ip_px_sa != NULL) {
thread_t child_thread = current_thread();
uthread_t child_uthread = uthread;
if (spawn_no_exec) {
child_thread = imgp->ip_new_thread;
child_uthread = get_bsdthread_info(child_thread);
}
if (px_sa.psa_flags & POSIX_SPAWN_SETSIGMASK)
child_uthread->uu_sigmask = (px_sa.psa_sigmask & ~sigcantmask);
if (px_sa.psa_flags & POSIX_SPAWN_SETSIGDEF) {
vec.sa_handler = SIG_DFL;
vec.sa_tramp = 0;
vec.sa_mask = 0;
vec.sa_flags = 0;
for (sig = 0; sig < NSIG; sig++)
if (px_sa.psa_sigdefault & (1 << sig)) {
error = setsigvec(p, child_thread, sig + 1, &vec, spawn_no_exec);
}
}
if (px_sa.psa_cpumonitor_percent != 0) {
error = proc_set_task_ruse_cpu(p->task,
TASK_POLICY_RESOURCE_ATTRIBUTE_NOTIFY_EXC,
PROC_POLICY_CPUMON_DEFAULTS, 0,
0, TRUE);
}
}
bad:
if (error == 0) {
if ((p->p_flag & P_DELAYIDLESLEEP) == P_DELAYIDLESLEEP)
OSBitAndAtomic(~((uint32_t)P_DELAYIDLESLEEP), &p->p_flag);
if (imgp->ip_px_sa != NULL) {
switch (px_sa.psa_pcontrol) {
case POSIX_SPAWN_PCONTROL_THROTTLE:
p->p_pcaction = P_PCTHROTTLE;
break;
case POSIX_SPAWN_PCONTROL_SUSPEND:
p->p_pcaction = P_PCSUSP;
break;
case POSIX_SPAWN_PCONTROL_KILL:
p->p_pcaction = P_PCKILL;
break;
case POSIX_SPAWN_PCONTROL_NONE:
default:
p->p_pcaction = 0;
break;
};
}
exec_resettextvp(p, imgp);
#if CONFIG_MEMORYSTATUS && CONFIG_JETSAM
if (imgp->ip_px_sa != NULL && (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_SET)) {
memorystatus_update(p, px_sa.psa_priority, 0, (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_USE_EFFECTIVE_PRIORITY),
TRUE, px_sa.psa_high_water_mark, (px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_HIWATER_BACKGROUND),
(px_sa.psa_jetsam_flags & POSIX_SPAWN_JETSAM_MEMLIMIT_FATAL));
}
#endif
}
if (spawn_no_exec) {
if (proc_transit_set)
proc_transend(p, 0);
proc_signalend(p, 0);
proc_knote(p->p_pptr, NOTE_FORK | p->p_pid);
if ((p->p_lflag & P_LTERM_DECRYPTFAIL) == 0)
proc_knote(p, NOTE_EXEC);
} else {
task_importance_reset(p->task);
task_atm_reset(p->task);
}
if (error == 0 && imgp->ip_px_sa != NULL) {
struct _posix_spawnattr *psa = (struct _posix_spawnattr *) imgp->ip_px_sa;
exec_handle_spawnattr_policy(p, psa->psa_apptype, psa->psa_qos_clamp,
portwatch_ports, portwatch_count);
}
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);
}
if (portwatch_ports != NULL) {
for (int i = 0; i < portwatch_count; i++) {
ipc_port_t port = NULL;
if ((port = portwatch_ports[i]) != NULL) {
ipc_port_release_send(port);
}
}
FREE(portwatch_ports, M_TEMP);
portwatch_ports = NULL;
portwatch_count = 0;
}
if (error == 0) {
error = check_for_signature(p, imgp);
if (imgp != NULL && spawn_no_exec && (p->p_lflag & P_LTRACED)) {
psignal_vfork(p, p->task, imgp->ip_new_thread, SIGTRAP);
}
}
if (imgp != NULL) {
if (imgp->ip_vp)
vnode_put(imgp->ip_vp);
if (imgp->ip_scriptvp)
vnode_put(imgp->ip_scriptvp);
if (imgp->ip_strings)
execargs_free(imgp);
if (imgp->ip_px_sfa != NULL)
FREE(imgp->ip_px_sfa, M_TEMP);
if (imgp->ip_px_spa != NULL)
FREE(imgp->ip_px_spa, M_TEMP);
#if CONFIG_MACF
if (imgp->ip_px_smpx != NULL)
spawn_free_macpolicyinfo(imgp->ip_px_smpx);
if (imgp->ip_execlabelp)
mac_cred_label_free(imgp->ip_execlabelp);
if (imgp->ip_scriptlabelp)
mac_vnode_label_free(imgp->ip_scriptlabelp);
#endif
}
#if CONFIG_DTRACE
if (spawn_no_exec) {
if (error) {
DTRACE_PROC1(spawn__failure, int, error);
} else {
DTRACE_PROC(spawn__success);
dtrace_thread_didexec(imgp->ip_new_thread);
}
} else {
if (error) {
DTRACE_PROC1(exec__failure, int, error);
} else {
DTRACE_PROC(exec__success);
}
}
if ((dtrace_proc_waitfor_hook = dtrace_proc_waitfor_exec_ptr) != NULL)
(*dtrace_proc_waitfor_hook)(p);
#endif
if (imgp != NULL && spawn_no_exec) {
if (pid != USER_ADDR_NULL)
(void)suword(pid, p->p_pid);
retval[0] = error;
if (error) {
proc_list_lock();
p->p_listflag |= P_LIST_DEADPARENT;
proc_list_unlock();
proc_lock(p);
if (p->p_stat != SZOMB && p->exit_thread == NULL) {
p->exit_thread = current_thread();
proc_unlock(p);
exit1(p, 1, (int *)NULL);
if (exec_done == FALSE) {
task_deallocate(get_threadtask(imgp->ip_new_thread));
thread_deallocate(imgp->ip_new_thread);
}
} else {
proc_unlock(p);
}
} else {
(void)thread_resume(imgp->ip_new_thread);
}
}
if (bufp != NULL) {
FREE(bufp, M_TEMP);
}
return(error);
}
int
execve(proc_t p, struct execve_args *uap, int32_t *retval)
{
struct __mac_execve_args muap;
int err;
memoryshot(VM_EXECVE, DBG_FUNC_NONE);
muap.fname = uap->fname;
muap.argp = uap->argp;
muap.envp = uap->envp;
muap.mac_p = USER_ADDR_NULL;
err = __mac_execve(p, &muap, retval);
return(err);
}
int
__mac_execve(proc_t p, struct __mac_execve_args *uap, int32_t *retval)
{
char *bufp = NULL;
struct image_params *imgp;
struct vnode_attr *vap;
struct vnode_attr *origvap;
int error;
char alt_p_comm[sizeof(p->p_comm)] = {0};
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);
MALLOC(bufp, char *, (sizeof(*imgp) + sizeof(*vap) + sizeof(*origvap)), M_TEMP, M_WAITOK | M_ZERO);
imgp = (struct image_params *) bufp;
if (bufp == NULL) {
error = ENOMEM;
goto exit_with_error;
}
vap = (struct vnode_attr *) (bufp + sizeof(*imgp));
origvap = (struct vnode_attr *) (bufp + sizeof(*imgp) + sizeof(*vap));
imgp->ip_user_fname = uap->fname;
imgp->ip_user_argv = uap->argp;
imgp->ip_user_envv = uap->envp;
imgp->ip_vattr = vap;
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;
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) {
error = mac_execve_enter(uap->mac_p, imgp);
if (error) {
kauth_cred_unref(&context.vc_ucred);
goto exit_with_error;
}
}
#endif
error = exec_activate_image(imgp);
kauth_cred_unref(&context.vc_ucred);
if (error == -1)
error = ENOEXEC;
if (error == 0) {
exec_resettextvp(p, imgp);
error = check_for_signature(p, imgp);
}
if (imgp->ip_vp != NULLVP)
vnode_put(imgp->ip_vp);
if (imgp->ip_scriptvp != NULLVP)
vnode_put(imgp->ip_scriptvp);
if (imgp->ip_strings)
execargs_free(imgp);
#if CONFIG_MACF
if (imgp->ip_execlabelp)
mac_cred_label_free(imgp->ip_execlabelp);
if (imgp->ip_scriptlabelp)
mac_vnode_label_free(imgp->ip_scriptlabelp);
#endif
if (!error) {
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);
task_importance_reset(p->task);
task_atm_reset(p->task);
DTRACE_PROC(exec__success);
#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);
}
} else {
DTRACE_PROC1(exec__failure, int, error);
}
exit_with_error:
if (bufp != NULL) {
FREE(bufp, M_TEMP);
}
return(error);
}
static int
copyinptr(user_addr_t froma, user_addr_t *toptr, int ptr_size)
{
int error;
if (ptr_size == 4) {
unsigned int i;
error = copyin(froma, &i, 4);
*toptr = CAST_USER_ADDR_T(i);
} else {
error = copyin(froma, toptr, 8);
}
return (error);
}
static int
copyoutptr(user_addr_t ua, user_addr_t ptr, int ptr_size)
{
int error;
if (ptr_size == 4) {
unsigned int i = CAST_DOWN_EXPLICIT(unsigned int,ua);
error = copyout(&i, ptr, 4);
} else {
error = copyout(&ua, ptr, 8);
}
return (error);
}
static int
exec_copyout_strings(struct image_params *imgp, user_addr_t *stackp)
{
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
int ptr_size = (imgp->ip_flags & IMGPF_IS_64BIT) ? 8 : 4;
int ptr_area_size;
void *ptr_buffer_start, *ptr_buffer;
int string_size;
user_addr_t string_area;
user_addr_t ptr_area;
user_addr_t argc_area;
user_addr_t stack;
int error;
unsigned i;
struct copyout_desc {
char *start_string;
int count;
#if CONFIG_DTRACE
user_addr_t *dtrace_cookie;
#endif
boolean_t null_term;
} descriptors[] = {
{
.start_string = imgp->ip_startargv,
.count = imgp->ip_argc,
#if CONFIG_DTRACE
.dtrace_cookie = &p->p_dtrace_argv,
#endif
.null_term = TRUE
},
{
.start_string = imgp->ip_endargv,
.count = imgp->ip_envc,
#if CONFIG_DTRACE
.dtrace_cookie = &p->p_dtrace_envp,
#endif
.null_term = TRUE
},
{
.start_string = imgp->ip_strings,
.count = 1,
#if CONFIG_DTRACE
.dtrace_cookie = NULL,
#endif
.null_term = FALSE
},
{
.start_string = imgp->ip_endenvv,
.count = imgp->ip_applec - 1,
#if CONFIG_DTRACE
.dtrace_cookie = NULL,
#endif
.null_term = TRUE
}
};
stack = *stackp;
if (imgp->ip_strspace % ptr_size != 0) {
error = EINVAL;
goto bad;
}
string_size = imgp->ip_strendp - imgp->ip_strings;
stack -= string_size;
string_area = stack;
ptr_area_size = (imgp->ip_argc + imgp->ip_envc + imgp->ip_applec + 3) *
ptr_size;
stack -= ptr_area_size;
ptr_area = stack;
ptr_buffer_start = ptr_buffer = (void *)imgp->ip_strendp;
stack -= ptr_size;
argc_area = stack;
proc_lock(p);
p->p_argc = imgp->ip_argc;
p->p_argslen = (int)(*stackp - string_area);
proc_unlock(p);
*stackp = stack;
error = copyout(imgp->ip_strings, string_area,
string_size);
if (error)
goto bad;
for (i = 0; i < sizeof(descriptors)/sizeof(descriptors[0]); i++) {
char *cur_string = descriptors[i].start_string;
int j;
#if CONFIG_DTRACE
if (descriptors[i].dtrace_cookie) {
proc_lock(p);
*descriptors[i].dtrace_cookie = ptr_area + ((uintptr_t)ptr_buffer - (uintptr_t)ptr_buffer_start);
proc_unlock(p);
}
#endif
for (j = 0; j < descriptors[i].count; j++) {
user_addr_t cur_address = string_area + (cur_string - imgp->ip_strings);
if (ptr_size == 8) {
*(uint64_t *)ptr_buffer = (uint64_t)cur_address;
} else {
*(uint32_t *)ptr_buffer = (uint32_t)cur_address;
}
ptr_buffer = (void *)((uintptr_t)ptr_buffer + ptr_size);
cur_string += strlen(cur_string) + 1;
}
if (descriptors[i].null_term) {
if (ptr_size == 8) {
*(uint64_t *)ptr_buffer = 0ULL;
} else {
*(uint32_t *)ptr_buffer = 0;
}
ptr_buffer = (void *)((uintptr_t)ptr_buffer + ptr_size);
}
}
error = copyout(ptr_buffer_start, ptr_area,
ptr_area_size);
if (error)
goto bad;
error = copyoutptr((user_addr_t)imgp->ip_argc, argc_area, ptr_size);
if (error)
goto bad;
bad:
return(error);
}
static int
exec_extract_strings(struct image_params *imgp)
{
int error = 0;
int ptr_size = (imgp->ip_flags & IMGPF_WAS_64BIT) ? 8 : 4;
int new_ptr_size = (imgp->ip_flags & IMGPF_IS_64BIT) ? 8 : 4;
user_addr_t argv = imgp->ip_user_argv;
user_addr_t envv = imgp->ip_user_envv;
while (imgp->ip_strspace % new_ptr_size != 0) {
*imgp->ip_strendp++ = '\0';
imgp->ip_strspace--;
}
imgp->ip_startargv = imgp->ip_strendp;
imgp->ip_argc = 0;
if((imgp->ip_flags & IMGPF_INTERPRET) != 0) {
user_addr_t arg;
char *argstart, *ch;
argstart = imgp->ip_interp_buffer;
while (argstart) {
ch = argstart;
while (*ch && !IS_WHITESPACE(*ch)) {
ch++;
}
if (*ch == '\0') {
error = exec_add_user_string(imgp, CAST_USER_ADDR_T(argstart), UIO_SYSSPACE, TRUE);
argstart = NULL;
} else {
*ch = '\0';
error = exec_add_user_string(imgp, CAST_USER_ADDR_T(argstart), UIO_SYSSPACE, TRUE);
argstart = ch + 1;
while (IS_WHITESPACE(*argstart)) {
argstart++;
}
}
if (error)
goto bad;
if (imgp->ip_argspace < new_ptr_size) {
error = E2BIG;
goto bad;
}
imgp->ip_argspace -= new_ptr_size;
imgp->ip_argc++;
}
if (argv != 0LL) {
error = copyinptr(argv, &arg, ptr_size);
if (error)
goto bad;
if (arg != 0LL) {
argv += ptr_size;
}
}
if (imgp->ip_interp_sugid_fd != -1) {
char temp[19];
snprintf(temp, sizeof(temp), "/dev/fd/%d", imgp->ip_interp_sugid_fd);
error = exec_add_user_string(imgp, CAST_USER_ADDR_T(temp), UIO_SYSSPACE, TRUE);
} else {
error = exec_add_user_string(imgp, imgp->ip_user_fname, imgp->ip_seg, TRUE);
}
if (error)
goto bad;
if (imgp->ip_argspace < new_ptr_size) {
error = E2BIG;
goto bad;
}
imgp->ip_argspace -= new_ptr_size;
imgp->ip_argc++;
}
while (argv != 0LL) {
user_addr_t arg;
error = copyinptr(argv, &arg, ptr_size);
if (error)
goto bad;
if (arg == 0LL) {
break;
}
argv += ptr_size;
error = exec_add_user_string(imgp, arg, imgp->ip_seg, TRUE);
if (error)
goto bad;
if (imgp->ip_argspace < new_ptr_size) {
error = E2BIG;
goto bad;
}
imgp->ip_argspace -= new_ptr_size;
imgp->ip_argc++;
}
if (imgp->ip_argspace < new_ptr_size) {
error = E2BIG;
goto bad;
}
imgp->ip_argspace -= new_ptr_size;
imgp->ip_endargv = imgp->ip_strendp;
imgp->ip_envc = 0;
while (envv != 0LL) {
user_addr_t env;
error = copyinptr(envv, &env, ptr_size);
if (error)
goto bad;
envv += ptr_size;
if (env == 0LL) {
break;
}
error = exec_add_user_string(imgp, env, imgp->ip_seg, TRUE);
if (error)
goto bad;
if (imgp->ip_argspace < new_ptr_size) {
error = E2BIG;
goto bad;
}
imgp->ip_argspace -= new_ptr_size;
imgp->ip_envc++;
}
if (imgp->ip_argspace < new_ptr_size) {
error = E2BIG;
goto bad;
}
imgp->ip_argspace -= new_ptr_size;
while (imgp->ip_strspace % new_ptr_size != 0) {
if (imgp->ip_argspace < 1) {
error = E2BIG;
goto bad;
}
*imgp->ip_strendp++ = '\0';
imgp->ip_strspace--;
imgp->ip_argspace--;
}
imgp->ip_endenvv = imgp->ip_strendp;
bad:
return error;
}
static char *
random_hex_str(char *str, int len, boolean_t embedNUL)
{
uint64_t low, high, value;
int idx;
char digit;
if (len > 19)
len = 19;
if (len < 4)
return (NULL);
low = random();
high = random();
value = high << 32 | low;
if (embedNUL) {
value &= ~(0xffull << 8);
}
str[0] = '0';
str[1] = 'x';
for (idx = 2; idx < len - 1; idx++) {
digit = value & 0xf;
value = value >> 4;
if (digit < 10)
str[idx] = '0' + digit;
else
str[idx] = 'a' + (digit - 10);
}
str[idx] = '\0';
return (str);
}
#define GUARD_VALUES 1
#define GUARD_KEY "stack_guard="
#define ENTROPY_VALUES 2
#define ENTROPY_KEY "malloc_entropy="
#define NANO_ENGAGE_KEY "MallocNanoZone=1"
#define PFZ_KEY "pfz="
extern user32_addr_t commpage_text32_location;
extern user64_addr_t commpage_text64_location;
static int
exec_add_apple_strings(struct image_params *imgp)
{
int i, error;
int new_ptr_size=4;
char guard[19];
char guard_vec[strlen(GUARD_KEY) + 19 * GUARD_VALUES + 1];
char entropy[19];
char entropy_vec[strlen(ENTROPY_KEY) + 19 * ENTROPY_VALUES + 1];
char pfz_string[strlen(PFZ_KEY) + 16 + 4 +1];
if( imgp->ip_flags & IMGPF_IS_64BIT) {
new_ptr_size = 8;
snprintf(pfz_string, sizeof(pfz_string),PFZ_KEY "0x%llx",commpage_text64_location);
} else {
snprintf(pfz_string, sizeof(pfz_string),PFZ_KEY "0x%x",commpage_text32_location);
}
imgp->ip_applec = 1;
error = exec_add_user_string(imgp, CAST_USER_ADDR_T(pfz_string),UIO_SYSSPACE,FALSE);
if(error)
goto bad;
imgp->ip_applec++;
if (imgp->ip_px_sa) {
int proc_flags = (((struct _posix_spawnattr *) imgp->ip_px_sa)->psa_flags);
if ((proc_flags & _POSIX_SPAWN_NANO_ALLOCATOR) == _POSIX_SPAWN_NANO_ALLOCATOR) {
char uiapp_string[strlen(NANO_ENGAGE_KEY) + 1];
snprintf(uiapp_string, sizeof(uiapp_string), NANO_ENGAGE_KEY);
error = exec_add_user_string(imgp, CAST_USER_ADDR_T(uiapp_string),UIO_SYSSPACE,FALSE);
if (error)
goto bad;
imgp->ip_applec++;
}
}
(void)strlcpy(guard_vec, GUARD_KEY, sizeof (guard_vec));
for (i = 0; i < GUARD_VALUES; i++) {
random_hex_str(guard, sizeof (guard), i == 0);
if (i)
(void)strlcat(guard_vec, ",", sizeof (guard_vec));
(void)strlcat(guard_vec, guard, sizeof (guard_vec));
}
error = exec_add_user_string(imgp, CAST_USER_ADDR_T(guard_vec), UIO_SYSSPACE, FALSE);
if (error)
goto bad;
imgp->ip_applec++;
(void)strlcpy(entropy_vec, ENTROPY_KEY, sizeof(entropy_vec));
for (i = 0; i < ENTROPY_VALUES; i++) {
random_hex_str(entropy, sizeof (entropy), FALSE);
if (i)
(void)strlcat(entropy_vec, ",", sizeof (entropy_vec));
(void)strlcat(entropy_vec, entropy, sizeof (entropy_vec));
}
error = exec_add_user_string(imgp, CAST_USER_ADDR_T(entropy_vec), UIO_SYSSPACE, FALSE);
if (error)
goto bad;
imgp->ip_applec++;
while (imgp->ip_strspace % new_ptr_size != 0) {
*imgp->ip_strendp++ = '\0';
imgp->ip_strspace--;
}
bad:
return error;
}
#define unix_stack_size(p) (p->p_rlimit[RLIMIT_STACK].rlim_cur)
static int
exec_check_permissions(struct image_params *imgp)
{
struct vnode *vp = imgp->ip_vp;
struct vnode_attr *vap = imgp->ip_vattr;
proc_t p = vfs_context_proc(imgp->ip_vfs_context);
int error;
kauth_action_t action;
if (!vnode_isreg(vp))
return (EACCES);
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);
if (!vfs_authopaque(vnode_mount(vp)) && ((vap->va_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0))
return (EACCES);
if (vap->va_data_size == 0)
return (ENOEXEC);
imgp->ip_arch_offset = (user_size_t)0;
imgp->ip_arch_size = vap->va_data_size;
if ((vp->v_mount->mnt_flag & MNT_NOSUID) || (p->p_lflag & P_LTRACED))
vap->va_mode &= ~(VSUID | VSGID);
if (vap->va_mode & (VSUID | VSGID))
imgp->ip_flags &= ~(IMGPF_ALLOW_DATA_EXEC | IMGPF_DISABLE_ASLR);
#if CONFIG_MACF
error = mac_vnode_check_exec(imgp->ip_vfs_context, vp, imgp);
if (error)
return (error);
#endif
action = KAUTH_VNODE_EXECUTE;
if (p->p_lflag & P_LTRACED)
action |= KAUTH_VNODE_READ_DATA;
if ((error = vnode_authorize(vp, NULL, action, imgp->ip_vfs_context)) != 0)
return (error);
#if 0
vnode_lock(vp);
if (vp->v_writecount) {
panic("going to return ETXTBSY %x", vp);
vnode_unlock(vp);
return (ETXTBSY);
}
vnode_unlock(vp);
#endif
return (error);
}
static int
exec_handle_sugid(struct image_params *imgp)
{
kauth_cred_t cred = vfs_context_ucred(imgp->ip_vfs_context);
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, disjoint_cred = 0;
int label_update_return = 0;
mac_transition = mac_cred_check_label_update_execve(
imgp->ip_vfs_context,
imgp->ip_vp,
imgp->ip_arch_offset,
imgp->ip_scriptvp,
imgp->ip_scriptlabelp,
imgp->ip_execlabelp,
p,
imgp->ip_px_smpx);
#endif
OSBitAndAtomic(~((uint32_t)P_SUGID), &p->p_flag);
if (((imgp->ip_origvattr->va_mode & VSUID) != 0 &&
kauth_cred_getuid(cred) != imgp->ip_origvattr->va_uid) ||
((imgp->ip_origvattr->va_mode & VSGID) != 0 &&
((kauth_cred_ismember_gid(cred, imgp->ip_origvattr->va_gid, &leave_sugid_clear) || !leave_sugid_clear) ||
(kauth_cred_getgid(cred) != imgp->ip_origvattr->va_gid)))) {
#if CONFIG_MACF
handle_mac_transition:
#endif
if (imgp->ip_origvattr->va_mode & VSUID) {
p->p_ucred = kauth_cred_setresuid(p->p_ucred, KAUTH_UID_NONE, imgp->ip_origvattr->va_uid, imgp->ip_origvattr->va_uid, KAUTH_UID_NONE);
PROC_UPDATE_CREDS_ONPROC(p);
}
if (imgp->ip_origvattr->va_mode & VSGID) {
p->p_ucred = kauth_cred_setresgid(p->p_ucred, KAUTH_GID_NONE, imgp->ip_origvattr->va_gid, imgp->ip_origvattr->va_gid);
PROC_UPDATE_CREDS_ONPROC(p);
}
#if CONFIG_MACF
if (mac_transition) {
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_csflags,
imgp->ip_px_smpx,
&disjoint_cred,
&label_update_return);
if (disjoint_cred) {
leave_sugid_clear = 0;
}
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
if (mac_reset_ipc || !leave_sugid_clear) {
ipc_task_reset(p->task);
ipc_thread_reset((imgp->ip_new_thread != NULL) ?
imgp->ip_new_thread : current_thread());
}
if (!leave_sugid_clear) {
OSBitOrAtomic(P_SUGID, &p->p_flag);
for (i = 0; i < 3; i++) {
if (p->p_fd->fd_ofiles[i] != NULL)
continue;
struct fileproc *fp;
int indx;
int flag;
struct nameidata *ndp = NULL;
if (i == 0)
flag = FREAD;
else
flag = FWRITE;
if ((error = falloc(p,
&fp, &indx, imgp->ip_vfs_context)) != 0)
continue;
MALLOC(ndp, struct nameidata *, sizeof(*ndp), M_TEMP, M_WAITOK | M_ZERO);
if (ndp == NULL) {
error = ENOMEM;
break;
}
NDINIT(ndp, LOOKUP, OP_OPEN, FOLLOW, UIO_SYSSPACE,
CAST_USER_ADDR_T("/dev/null"),
imgp->ip_vfs_context);
if ((error = vn_open(ndp, flag, 0)) != 0) {
fp_free(p, indx, fp);
break;
}
struct fileglob *fg = fp->f_fglob;
fg->fg_flag = flag;
fg->fg_ops = &vnops;
fg->fg_data = ndp->ni_vp;
vnode_put(ndp->ni_vp);
proc_fdlock(p);
procfdtbl_releasefd(p, indx, NULL);
fp_drop(p, indx, fp, 1);
proc_fdunlock(p);
FREE(ndp, M_TEMP);
}
}
}
#if CONFIG_MACF
else {
if (mac_transition) {
leave_sugid_clear = 1;
goto handle_mac_transition;
}
}
#endif
p->p_ucred = kauth_cred_setsvuidgid(p->p_ucred, kauth_cred_getuid(p->p_ucred), kauth_cred_getgid(p->p_ucred));
PROC_UPDATE_CREDS_ONPROC(p);
p->p_idversion++;
set_security_token(p);
return(error);
}
static kern_return_t
create_unix_stack(vm_map_t map, load_result_t* load_result,
proc_t p)
{
mach_vm_size_t size, prot_size;
mach_vm_offset_t addr, prot_addr;
kern_return_t kr;
mach_vm_address_t user_stack = load_result->user_stack;
proc_lock(p);
p->user_stack = user_stack;
proc_unlock(p);
if (!load_result->prog_allocated_stack) {
size = mach_vm_round_page(load_result->user_stack_size);
if (load_result->prog_stack_size)
size += PAGE_SIZE;
addr = mach_vm_trunc_page(load_result->user_stack - size);
kr = mach_vm_allocate(map, &addr, size,
VM_MAKE_TAG(VM_MEMORY_STACK) |
VM_FLAGS_FIXED);
if (kr != KERN_SUCCESS) {
addr = 0;
kr = mach_vm_allocate(map, &addr, size,
VM_MAKE_TAG(VM_MEMORY_STACK) |
VM_FLAGS_ANYWHERE);
if (kr != KERN_SUCCESS)
return kr;
user_stack = addr + size;
load_result->user_stack = user_stack;
proc_lock(p);
p->user_stack = user_stack;
proc_unlock(p);
}
prot_addr = addr;
if (load_result->prog_stack_size)
prot_size = PAGE_SIZE;
else
prot_size = mach_vm_trunc_page(size - unix_stack_size(p));
kr = mach_vm_protect(map,
prot_addr,
prot_size,
FALSE,
VM_PROT_NONE);
if (kr != KERN_SUCCESS) {
(void) mach_vm_deallocate(map, addr, size);
return kr;
}
}
return KERN_SUCCESS;
}
#include <sys/reboot.h>
static const char * init_programs[] = {
#if DEVELOPMENT || DEBUG
"/usr/local/sbin/launchd.development",
#endif
"/sbin/launchd",
};
void
load_init_program(proc_t p)
{
vm_offset_t init_addr, addr;
int argc;
uint32_t argv[3];
unsigned int i;
int error;
int retval[2];
const char *init_program_name;
struct execve_args init_exec_args;
init_addr = VM_MIN_ADDRESS;
(void) vm_allocate(current_map(), &init_addr, PAGE_SIZE, VM_FLAGS_ANYWHERE);
if (init_addr == 0)
init_addr++;
for (i = 0; i < sizeof(init_programs)/sizeof(init_programs[0]); i++) {
init_program_name = init_programs[i];
addr = init_addr;
argc = 0;
(void) copyout(init_program_name, CAST_USER_ADDR_T(addr), strlen(init_program_name)+1);
argv[argc++] = (uint32_t)addr;
addr += strlen(init_program_name)+1;
addr = (vm_offset_t)ROUND_PTR(char, addr);
if (boothowto & RB_SINGLE) {
const char *init_args = "-s";
copyout(init_args, CAST_USER_ADDR_T(addr), strlen(init_args)+1);
argv[argc++] = (uint32_t)addr;
addr += strlen(init_args)+1;
addr = (vm_offset_t)ROUND_PTR(char, addr);
}
argv[argc] = 0;
(void) copyout(argv, CAST_USER_ADDR_T(addr), sizeof(argv));
init_exec_args.fname = CAST_USER_ADDR_T(argv[0]);
init_exec_args.argp = CAST_USER_ADDR_T((char **)addr);
init_exec_args.envp = CAST_USER_ADDR_T(0);
set_security_token(p);
error = execve(p, &init_exec_args, retval);
if (!error)
return;
}
panic("Process 1 exec of %s failed, errno %d", init_program_name, error);
}
static int
load_return_to_errno(load_return_t lrtn)
{
switch (lrtn) {
case LOAD_SUCCESS:
return 0;
case LOAD_BADARCH:
return EBADARCH;
case LOAD_BADMACHO:
return EBADMACHO;
case LOAD_SHLIB:
return ESHLIBVERS;
case LOAD_NOSPACE:
case LOAD_RESOURCE:
return ENOMEM;
case LOAD_PROTECT:
return EACCES;
case LOAD_ENOENT:
return ENOENT;
case LOAD_IOERROR:
return EIO;
case LOAD_FAILURE:
case LOAD_DECRYPTFAIL:
default:
return EBADEXEC;
}
}
#include <mach/mach_types.h>
#include <mach/vm_prot.h>
#include <mach/semaphore.h>
#include <mach/sync_policy.h>
#include <kern/clock.h>
#include <mach/kern_return.h>
static int execargs_waiters = 0;
lck_mtx_t *execargs_cache_lock;
static void
execargs_lock_lock(void) {
lck_mtx_lock_spin(execargs_cache_lock);
}
static void
execargs_lock_unlock(void) {
lck_mtx_unlock(execargs_cache_lock);
}
static wait_result_t
execargs_lock_sleep(void) {
return(lck_mtx_sleep(execargs_cache_lock, LCK_SLEEP_DEFAULT, &execargs_free_count, THREAD_INTERRUPTIBLE));
}
static kern_return_t
execargs_purgeable_allocate(char **execarg_address) {
kern_return_t kr = vm_allocate(bsd_pageable_map, (vm_offset_t *)execarg_address, BSD_PAGEABLE_SIZE_PER_EXEC, VM_FLAGS_ANYWHERE | VM_FLAGS_PURGABLE);
assert(kr == KERN_SUCCESS);
return kr;
}
static kern_return_t
execargs_purgeable_reference(void *execarg_address) {
int state = VM_PURGABLE_NONVOLATILE;
kern_return_t kr = vm_purgable_control(bsd_pageable_map, (vm_offset_t) execarg_address, VM_PURGABLE_SET_STATE, &state);
assert(kr == KERN_SUCCESS);
return kr;
}
static kern_return_t
execargs_purgeable_volatilize(void *execarg_address) {
int state = VM_PURGABLE_VOLATILE | VM_PURGABLE_ORDERING_OBSOLETE;
kern_return_t kr;
kr = vm_purgable_control(bsd_pageable_map, (vm_offset_t) execarg_address, VM_PURGABLE_SET_STATE, &state);
assert(kr == KERN_SUCCESS);
return kr;
}
static void
execargs_wakeup_waiters(void) {
thread_wakeup(&execargs_free_count);
}
static int
execargs_alloc(struct image_params *imgp)
{
kern_return_t kret;
wait_result_t res;
int i, cache_index = -1;
execargs_lock_lock();
while (execargs_free_count == 0) {
execargs_waiters++;
res = execargs_lock_sleep();
execargs_waiters--;
if (res != THREAD_AWAKENED) {
execargs_lock_unlock();
return (EINTR);
}
}
execargs_free_count--;
for (i = 0; i < execargs_cache_size; i++) {
vm_offset_t element = execargs_cache[i];
if (element) {
cache_index = i;
imgp->ip_strings = (char *)(execargs_cache[i]);
execargs_cache[i] = 0;
break;
}
}
assert(execargs_free_count >= 0);
execargs_lock_unlock();
if (cache_index == -1) {
kret = execargs_purgeable_allocate(&imgp->ip_strings);
}
else
kret = execargs_purgeable_reference(imgp->ip_strings);
assert(kret == KERN_SUCCESS);
if (kret != KERN_SUCCESS) {
return (ENOMEM);
}
imgp->ip_vdata = imgp->ip_strings + ( NCARGS + PAGE_SIZE );
imgp->ip_strendp = imgp->ip_strings;
imgp->ip_argspace = NCARGS;
imgp->ip_strspace = ( NCARGS + PAGE_SIZE );
return (0);
}
static int
execargs_free(struct image_params *imgp)
{
kern_return_t kret;
int i;
boolean_t needs_wakeup = FALSE;
kret = execargs_purgeable_volatilize(imgp->ip_strings);
execargs_lock_lock();
execargs_free_count++;
for (i = 0; i < execargs_cache_size; i++) {
vm_offset_t element = execargs_cache[i];
if (element == 0) {
execargs_cache[i] = (vm_offset_t) imgp->ip_strings;
imgp->ip_strings = NULL;
break;
}
}
assert(imgp->ip_strings == NULL);
if (execargs_waiters > 0)
needs_wakeup = TRUE;
execargs_lock_unlock();
if (needs_wakeup == TRUE)
execargs_wakeup_waiters();
return ((kret == KERN_SUCCESS ? 0 : EINVAL));
}
static void
exec_resettextvp(proc_t p, struct image_params *imgp)
{
vnode_t vp;
off_t offset;
vnode_t tvp = p->p_textvp;
int ret;
vp = imgp->ip_vp;
offset = imgp->ip_arch_offset;
if (vp == NULLVP)
panic("exec_resettextvp: expected valid vp");
ret = vnode_ref(vp);
proc_lock(p);
if (ret == 0) {
p->p_textvp = vp;
p->p_textoff = offset;
} else {
p->p_textvp = NULLVP;
p->p_textoff = 0;
}
proc_unlock(p);
if ( tvp != NULLVP) {
if (vnode_getwithref(tvp) == 0) {
vnode_rele(tvp);
vnode_put(tvp);
}
}
}
static boolean_t
taskgated_required(proc_t p, boolean_t *require_success)
{
size_t length;
void *blob;
int error;
if ((p->p_csflags & CS_VALID) == 0) {
*require_success = FALSE;
return TRUE;
}
error = cs_entitlements_blob_get(p, &blob, &length);
if (error == 0 && blob != NULL) {
if ((boothowto & RB_SINGLE) == 0)
*require_success = TRUE;
if (p == initproc) {
*require_success = FALSE;
return FALSE;
}
return TRUE;
}
*require_success = FALSE;
return 0;
}
__attribute__((noinline)) int
__EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__(mach_port_t task_access_port, int32_t new_pid)
{
return find_code_signature(task_access_port, new_pid);
}
static int
check_for_signature(proc_t p, struct image_params *imgp)
{
mach_port_t port = NULL;
kern_return_t kr = KERN_FAILURE;
int error = EACCES;
boolean_t unexpected_failure = FALSE;
unsigned char hash[SHA1_RESULTLEN];
boolean_t require_success = FALSE;
int spawn = (imgp->ip_flags & IMGPF_SPAWN);
int vfexec = (imgp->ip_flags & IMGPF_VFORK_EXEC);
proc_lock(p);
p->p_csflags = imgp->ip_csflags;
proc_unlock(p);
if(p->p_csflags & (CS_HARD|CS_KILL)) {
vm_map_switch_protect(get_task_map(p->task), TRUE);
}
if (imgp->ip_mac_return != 0) {
error = imgp->ip_mac_return;
unexpected_failure = TRUE;
goto done;
}
if (!taskgated_required(p, &require_success)) {
error = 0;
goto done;
}
kr = task_get_task_access_port(p->task, &port);
if (KERN_SUCCESS != kr || !IPC_PORT_VALID(port)) {
error = 0;
if (require_success)
error = EACCES;
goto done;
}
kr = __EXEC_WAITING_ON_TASKGATED_CODE_SIGNATURE_UPCALL__(port, p->p_pid);
switch (kr) {
case KERN_SUCCESS:
error = 0;
break;
case KERN_FAILURE:
error = EACCES;
goto done;
default:
error = EACCES;
unexpected_failure = TRUE;
goto done;
}
if (p->p_textvp != NULLVP) {
if (0 == ubc_cs_getcdhash(p->p_textvp, p->p_textoff, hash)) {
proc_lock(p);
p->p_csflags |= CS_VALID;
proc_unlock(p);
}
}
done:
if (0 != error) {
if (!unexpected_failure)
p->p_csflags |= CS_KILLED;
if (vfexec || spawn) {
psignal_vfork(p, p->task, imgp->ip_new_thread, SIGKILL);
error = 0;
} else {
psignal(p, SIGKILL);
}
}
return error;
}
static void exec_prefault_data(proc_t p __unused, struct image_params *imgp, load_result_t *load_result)
{
int ret;
size_t expected_all_image_infos_size;
vm_fault(current_map(),
vm_map_trunc_page(load_result->entry_point,
vm_map_page_mask(current_map())),
VM_PROT_READ | VM_PROT_EXECUTE,
FALSE,
THREAD_UNINT, NULL, 0);
if (imgp->ip_flags & IMGPF_IS_64BIT) {
expected_all_image_infos_size = sizeof(struct user64_dyld_all_image_infos);
} else {
expected_all_image_infos_size = sizeof(struct user32_dyld_all_image_infos);
}
if (load_result->dynlinker &&
load_result->all_image_info_addr &&
load_result->all_image_info_size >= expected_all_image_infos_size) {
union {
struct user64_dyld_all_image_infos infos64;
struct user32_dyld_all_image_infos infos32;
} all_image_infos;
vm_fault(current_map(),
vm_map_trunc_page(load_result->all_image_info_addr,
vm_map_page_mask(current_map())),
VM_PROT_READ | VM_PROT_WRITE,
FALSE,
THREAD_UNINT, NULL, 0);
if ((load_result->all_image_info_addr & PAGE_MASK) + expected_all_image_infos_size > PAGE_SIZE) {
vm_fault(current_map(),
vm_map_trunc_page(load_result->all_image_info_addr + expected_all_image_infos_size - 1,
vm_map_page_mask(current_map())),
VM_PROT_READ | VM_PROT_WRITE,
FALSE,
THREAD_UNINT, NULL, 0);
}
ret = copyin(load_result->all_image_info_addr,
&all_image_infos,
expected_all_image_infos_size);
if (ret == 0 && all_image_infos.infos32.version >= 9) {
user_addr_t notification_address;
user_addr_t dyld_image_address;
user_addr_t dyld_version_address;
user_addr_t dyld_all_image_infos_address;
user_addr_t dyld_slide_amount;
if (imgp->ip_flags & IMGPF_IS_64BIT) {
notification_address = all_image_infos.infos64.notification;
dyld_image_address = all_image_infos.infos64.dyldImageLoadAddress;
dyld_version_address = all_image_infos.infos64.dyldVersion;
dyld_all_image_infos_address = all_image_infos.infos64.dyldAllImageInfosAddress;
} else {
notification_address = all_image_infos.infos32.notification;
dyld_image_address = all_image_infos.infos32.dyldImageLoadAddress;
dyld_version_address = all_image_infos.infos32.dyldVersion;
dyld_all_image_infos_address = all_image_infos.infos32.dyldAllImageInfosAddress;
}
dyld_slide_amount = load_result->all_image_info_addr - dyld_all_image_infos_address;
#if 0
kprintf("exec_prefault: 0x%016llx 0x%08x 0x%016llx 0x%016llx 0x%016llx 0x%016llx\n",
(uint64_t)load_result->all_image_info_addr,
all_image_infos.infos32.version,
(uint64_t)notification_address,
(uint64_t)dyld_image_address,
(uint64_t)dyld_version_address,
(uint64_t)dyld_all_image_infos_address);
#endif
vm_fault(current_map(),
vm_map_trunc_page(notification_address + dyld_slide_amount,
vm_map_page_mask(current_map())),
VM_PROT_READ | VM_PROT_EXECUTE,
FALSE,
THREAD_UNINT, NULL, 0);
vm_fault(current_map(),
vm_map_trunc_page(dyld_image_address + dyld_slide_amount,
vm_map_page_mask(current_map())),
VM_PROT_READ | VM_PROT_EXECUTE,
FALSE,
THREAD_UNINT, NULL, 0);
vm_fault(current_map(),
vm_map_trunc_page(dyld_version_address + dyld_slide_amount,
vm_map_page_mask(current_map())),
VM_PROT_READ,
FALSE,
THREAD_UNINT, NULL, 0);
vm_fault(current_map(),
vm_map_trunc_page(dyld_all_image_infos_address + dyld_slide_amount,
vm_map_page_mask(current_map())),
VM_PROT_READ | VM_PROT_WRITE,
FALSE,
THREAD_UNINT, NULL, 0);
}
}
}