/*
- * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
#include <machine/reg.h>
#include <machine/psl.h>
+#include <stdatomic.h>
#include "compat_43.h"
#include <sys/malloc.h>
#include <sys/resourcevar.h>
#include <sys/ptrace.h>
+#include <sys/proc_info.h>
+#include <sys/reason.h>
+#include <sys/_types/_timeval64.h>
#include <sys/user.h>
#include <sys/aio_kern.h>
#include <sys/sysproto.h>
#include <sys/signalvar.h>
#include <sys/kdebug.h>
-#include <sys/filedesc.h> /* fdfree */
-#if SYSV_SHM
-#include <sys/shm_internal.h> /* shmexit */
-#endif
-#include <sys/acct.h> /* acct_process */
+#include <sys/filedesc.h> /* fdfree */
+#include <sys/acct.h> /* acct_process */
+#include <sys/codesign.h>
+#include <sys/event.h> /* kevent_proc_copy_uptrs */
+#include <sys/sdt.h>
#include <security/audit/audit.h>
#include <bsm/audit_kevents.h>
#include <mach/mach_types.h>
+#include <mach/task.h>
+#include <mach/thread_act.h>
+#include <kern/exc_resource.h>
#include <kern/kern_types.h>
#include <kern/kalloc.h>
#include <kern/task.h>
+#include <corpses/task_corpse.h>
#include <kern/thread.h>
#include <kern/thread_call.h>
#include <kern/sched_prim.h>
#include <kern/assert.h>
-#include <sys/codesign.h>
+#include <kern/policy_internal.h>
+#include <kern/exc_guard.h>
-#if VM_PRESSURE_EVENTS
-#include <kern/vm_pressure.h>
-#endif
+#include <vm/vm_protos.h>
+#include <pexpert/pexpert.h>
+
+#if SYSV_SHM
+#include <sys/shm_internal.h> /* shmexit */
+#endif /* SYSV_SHM */
+#if CONFIG_PERSONAS
+#include <sys/persona.h>
+#endif /* CONFIG_PERSONAS */
#if CONFIG_MEMORYSTATUS
#include <sys/kern_memorystatus.h>
-#endif
-
+#endif /* CONFIG_MEMORYSTATUS */
#if CONFIG_DTRACE
/* Do not include dtrace.h, it redefines kmem_[alloc/free] */
-extern void (*dtrace_fasttrap_exit_ptr)(proc_t);
-extern void (*dtrace_helpers_cleanup)(proc_t);
-extern void dtrace_lazy_dofs_destroy(proc_t);
-
+void dtrace_proc_exit(proc_t p);
#include <sys/dtrace_ptss.h>
-#endif
-
+#endif /* CONFIG_DTRACE */
#if CONFIG_MACF
-#include <security/mac.h>
+#include <security/mac_framework.h>
+#include <security/mac_mach_internal.h>
#include <sys/syscall.h>
-#endif
+#endif /* CONFIG_MACF */
-#include <mach/mach_types.h>
-#include <mach/task.h>
-#include <mach/thread_act.h>
-
-#include <vm/vm_protos.h>
-
-#include <sys/sdt.h>
-
-extern boolean_t init_task_died;
-extern char init_task_failure_data[];
void proc_prepareexit(proc_t p, int rv, boolean_t perf_notify);
+void gather_populate_corpse_crashinfo(proc_t p, task_t corpse_task,
+ mach_exception_data_type_t code, mach_exception_data_type_t subcode,
+ uint64_t *udata_buffer, int num_udata, void *reason);
+mach_exception_data_type_t proc_encode_exit_exception_code(proc_t p);
void vfork_exit(proc_t p, int rv);
-void vproc_exit(proc_t p);
__private_extern__ void munge_user64_rusage(struct rusage *a_rusage_p, struct user64_rusage *a_user_rusage_p);
__private_extern__ void munge_user32_rusage(struct rusage *a_rusage_p, struct user32_rusage *a_user_rusage_p);
static int reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock);
+static void populate_corpse_crashinfo(proc_t p, task_t corpse_task,
+ struct rusage_superset *rup, mach_exception_data_type_t code,
+ mach_exception_data_type_t subcode, uint64_t *udata_buffer,
+ int num_udata, os_reason_t reason);
+static void proc_update_corpse_exception_codes(proc_t p, mach_exception_data_type_t *code, mach_exception_data_type_t *subcode);
+extern int proc_pidpathinfo_internal(proc_t p, uint64_t arg, char *buffer, uint32_t buffersize, int32_t *retval);
+static __attribute__((noinline)) void launchd_crashed_panic(proc_t p, int rv);
+extern void proc_piduniqidentifierinfo(proc_t p, struct proc_uniqidentifierinfo *p_uniqidinfo);
+extern void task_coalition_ids(task_t task, uint64_t ids[COALITION_NUM_TYPES]);
+extern uint64_t get_task_phys_footprint_limit(task_t);
+int proc_list_uptrs(void *p, uint64_t *udata_buffer, int size);
+extern uint64_t task_corpse_get_crashed_thread_id(task_t corpse_task);
+
/*
* Things which should have prototypes in headers, but don't
kern_return_t sys_perf_notify(thread_t thread, int pid);
kern_return_t task_exception_notify(exception_type_t exception,
mach_exception_data_type_t code, mach_exception_data_type_t subcode);
+kern_return_t task_violated_guard(mach_exception_code_t, mach_exception_subcode_t, void *);
void delay(int);
void gather_rusage_info(proc_t p, rusage_info_current *ru, int flavor);
{
if (is64) {
user64_siginfo_t sinfo64;
-
+
bzero(&sinfo64, sizeof (sinfo64));
siginfo_user_to_user64(native, &sinfo64);
return (copyout(&sinfo64, uaddr, sizeof (sinfo64)));
}
}
+void gather_populate_corpse_crashinfo(proc_t p, task_t corpse_task,
+ mach_exception_data_type_t code, mach_exception_data_type_t subcode,
+ uint64_t *udata_buffer, int num_udata, void *reason)
+{
+ struct rusage_superset rup;
+
+ gather_rusage_info(p, &rup.ri, RUSAGE_INFO_CURRENT);
+ rup.ri.ri_phys_footprint = 0;
+ populate_corpse_crashinfo(p, corpse_task, &rup, code, subcode,
+ udata_buffer, num_udata, reason);
+}
+
+static void proc_update_corpse_exception_codes(proc_t p, mach_exception_data_type_t *code, mach_exception_data_type_t *subcode)
+{
+ mach_exception_data_type_t code_update = *code;
+ mach_exception_data_type_t subcode_update = *subcode;
+ if (p->p_exit_reason == OS_REASON_NULL) {
+ return;
+ }
+
+ switch (p->p_exit_reason->osr_namespace) {
+ case OS_REASON_JETSAM:
+ if (p->p_exit_reason->osr_code == JETSAM_REASON_MEMORY_PERPROCESSLIMIT) {
+ /* Update the code with EXC_RESOURCE code for high memory watermark */
+ EXC_RESOURCE_ENCODE_TYPE(code_update, RESOURCE_TYPE_MEMORY);
+ EXC_RESOURCE_ENCODE_FLAVOR(code_update, FLAVOR_HIGH_WATERMARK);
+ EXC_RESOURCE_HWM_ENCODE_LIMIT(code_update, ((get_task_phys_footprint_limit(p->task)) >> 20));
+ subcode_update = 0;
+ break;
+ }
+
+ break;
+ default:
+ break;
+ }
+
+ *code = code_update;
+ *subcode = subcode_update;
+ return;
+}
+
+mach_exception_data_type_t proc_encode_exit_exception_code(proc_t p)
+{
+ uint64_t subcode = 0;
+
+ if (p->p_exit_reason == OS_REASON_NULL) {
+ return 0;
+ }
+
+ /* Embed first 32 bits of osr_namespace and osr_code in exception code */
+ ENCODE_OSR_NAMESPACE_TO_MACH_EXCEPTION_CODE(subcode, p->p_exit_reason->osr_namespace);
+ ENCODE_OSR_CODE_TO_MACH_EXCEPTION_CODE(subcode, p->p_exit_reason->osr_code);
+ return (mach_exception_data_type_t)subcode;
+}
+
+static void
+populate_corpse_crashinfo(proc_t p, task_t corpse_task, struct rusage_superset *rup,
+ mach_exception_data_type_t code, mach_exception_data_type_t subcode,
+ uint64_t *udata_buffer, int num_udata, os_reason_t reason)
+{
+ mach_vm_address_t uaddr = 0;
+ mach_exception_data_type_t exc_codes[EXCEPTION_CODE_MAX];
+ exc_codes[0] = code;
+ exc_codes[1] = subcode;
+ cpu_type_t cputype;
+ struct proc_uniqidentifierinfo p_uniqidinfo;
+ struct proc_workqueueinfo pwqinfo;
+ int retval = 0;
+ uint64_t crashed_threadid = task_corpse_get_crashed_thread_id(corpse_task);
+ unsigned int pflags = 0;
+ uint64_t max_footprint_mb;
+ uint64_t max_footprint;
+ void *crash_info_ptr = task_get_corpseinfo(corpse_task);
+
+#if CONFIG_MEMORYSTATUS
+ int memstat_dirty_flags = 0;
+#endif
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_EXCEPTION_CODES, sizeof(exc_codes), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, exc_codes, sizeof(exc_codes));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PID, sizeof(p->p_pid), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_pid, sizeof(p->p_pid));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PPID, sizeof(p->p_ppid), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_ppid, sizeof(p->p_ppid));
+ }
+
+ /* Don't include the crashed thread ID if there's an exit reason that indicates it's irrelevant */
+ if ((p->p_exit_reason == OS_REASON_NULL) || !(p->p_exit_reason->osr_flags & OS_REASON_FLAG_NO_CRASHED_TID)) {
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_CRASHED_THREADID, sizeof(uint64_t), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &crashed_threadid, sizeof(uint64_t));
+ }
+ }
+
+ if (KERN_SUCCESS ==
+ kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_BSDINFOWITHUNIQID, sizeof(struct proc_uniqidentifierinfo), &uaddr)) {
+ proc_piduniqidentifierinfo(p, &p_uniqidinfo);
+ kcdata_memcpy(crash_info_ptr, uaddr, &p_uniqidinfo, sizeof(struct proc_uniqidentifierinfo));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_RUSAGE_INFO, sizeof(rusage_info_current), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &rup->ri, sizeof(rusage_info_current));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_CSFLAGS, sizeof(p->p_csflags), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_csflags, sizeof(p->p_csflags));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_NAME, sizeof(p->p_comm), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_comm, sizeof(p->p_comm));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_STARTTIME, sizeof(p->p_start), &uaddr)) {
+ struct timeval64 t64;
+ t64.tv_sec = (int64_t)p->p_start.tv_sec;
+ t64.tv_usec = (int64_t)p->p_start.tv_usec;
+ kcdata_memcpy(crash_info_ptr, uaddr, &t64, sizeof(t64));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_USERSTACK, sizeof(p->user_stack), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->user_stack, sizeof(p->user_stack));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_ARGSLEN, sizeof(p->p_argslen), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_argslen, sizeof(p->p_argslen));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_ARGC, sizeof(p->p_argc), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_argc, sizeof(p->p_argc));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_PATH, MAXPATHLEN, &uaddr)) {
+ char *buf = (char *) kalloc(MAXPATHLEN);
+ if (buf != NULL) {
+ bzero(buf, MAXPATHLEN);
+ proc_pidpathinfo_internal(p, 0, buf, MAXPATHLEN, &retval);
+ kcdata_memcpy(crash_info_ptr, uaddr, buf, MAXPATHLEN);
+ kfree(buf, MAXPATHLEN);
+ }
+ }
+
+ pflags = p->p_flag & (P_LP64 | P_SUGID);
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_PROC_FLAGS, sizeof(pflags), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &pflags, sizeof(pflags));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_UID, sizeof(p->p_uid), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_uid, sizeof(p->p_uid));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_GID, sizeof(p->p_gid), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_gid, sizeof(p->p_gid));
+ }
+
+ cputype = cpu_type() & ~CPU_ARCH_MASK;
+ if (IS_64BIT_PROCESS(p))
+ cputype |= CPU_ARCH_ABI64;
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_CPUTYPE, sizeof(cpu_type_t), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &cputype, sizeof(cpu_type_t));
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_MEMORY_LIMIT, sizeof(max_footprint_mb), &uaddr)) {
+ max_footprint = get_task_phys_footprint_limit(p->task);
+ max_footprint_mb = max_footprint >> 20;
+ kcdata_memcpy(crash_info_ptr, uaddr, &max_footprint_mb, sizeof(max_footprint_mb));
+ }
+
+ bzero(&pwqinfo, sizeof(struct proc_workqueueinfo));
+ retval = fill_procworkqueue(p, &pwqinfo);
+ if (retval == 0) {
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_WORKQUEUEINFO, sizeof(struct proc_workqueueinfo), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &pwqinfo, sizeof(struct proc_workqueueinfo));
+ }
+ }
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_RESPONSIBLE_PID, sizeof(p->p_responsible_pid), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &p->p_responsible_pid, sizeof(p->p_responsible_pid));
+ }
+
+#if CONFIG_COALITIONS
+ if (KERN_SUCCESS == kcdata_get_memory_addr_for_array(crash_info_ptr, TASK_CRASHINFO_COALITION_ID, sizeof(uint64_t), COALITION_NUM_TYPES, &uaddr)) {
+ uint64_t coalition_ids[COALITION_NUM_TYPES];
+ task_coalition_ids(p->task, coalition_ids);
+ kcdata_memcpy(crash_info_ptr, uaddr, coalition_ids, sizeof(coalition_ids));
+ }
+#endif /* CONFIG_COALITIONS */
+
+#if CONFIG_MEMORYSTATUS
+ memstat_dirty_flags = memorystatus_dirty_get(p);
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, TASK_CRASHINFO_DIRTY_FLAGS, sizeof(memstat_dirty_flags), &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, &memstat_dirty_flags, sizeof(memstat_dirty_flags));
+ }
+#endif
+
+ if (p->p_exit_reason != OS_REASON_NULL && reason == OS_REASON_NULL) {
+ reason = p->p_exit_reason;
+ }
+ if (reason != OS_REASON_NULL) {
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, EXIT_REASON_SNAPSHOT, sizeof(struct exit_reason_snapshot), &uaddr)) {
+ struct exit_reason_snapshot ers = {
+ .ers_namespace = reason->osr_namespace,
+ .ers_code = reason->osr_code,
+ .ers_flags = reason->osr_flags
+ };
+
+ kcdata_memcpy(crash_info_ptr, uaddr, &ers, sizeof(ers));
+ }
+
+ if (reason->osr_kcd_buf != 0) {
+ uint32_t reason_buf_size = kcdata_memory_get_used_bytes(&reason->osr_kcd_descriptor);
+ assert(reason_buf_size != 0);
+
+ if (KERN_SUCCESS == kcdata_get_memory_addr(crash_info_ptr, KCDATA_TYPE_NESTED_KCDATA, reason_buf_size, &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, reason->osr_kcd_buf, reason_buf_size);
+ }
+ }
+ }
+
+ if (num_udata > 0) {
+ if (KERN_SUCCESS == kcdata_get_memory_addr_for_array(crash_info_ptr, TASK_CRASHINFO_UDATA_PTRS,
+ sizeof(uint64_t), num_udata, &uaddr)) {
+ kcdata_memcpy(crash_info_ptr, uaddr, udata_buffer, sizeof(uint64_t) * num_udata);
+ }
+ }
+}
+
+/*
+ * We only parse exit reason kcdata blobs for launchd when it dies
+ * and we're going to panic.
+ *
+ * Meant to be called immediately before panicking.
+ */
+char *
+launchd_exit_reason_get_string_desc(os_reason_t exit_reason)
+{
+ kcdata_iter_t iter;
+
+ if (exit_reason == OS_REASON_NULL || exit_reason->osr_kcd_buf == NULL ||
+ exit_reason->osr_bufsize == 0) {
+ return NULL;
+ }
+
+ iter = kcdata_iter(exit_reason->osr_kcd_buf, exit_reason->osr_bufsize);
+ if (!kcdata_iter_valid(iter)) {
+#if DEBUG || DEVELOPMENT
+ printf("launchd exit reason has invalid exit reason buffer\n");
+#endif
+ return NULL;
+ }
+
+ if (kcdata_iter_type(iter) != KCDATA_BUFFER_BEGIN_OS_REASON) {
+#if DEBUG || DEVELOPMENT
+ printf("launchd exit reason buffer type mismatch, expected %d got %d\n",
+ KCDATA_BUFFER_BEGIN_OS_REASON, kcdata_iter_type(iter));
+#endif
+ return NULL;
+ }
+
+ iter = kcdata_iter_find_type(iter, EXIT_REASON_USER_DESC);
+ if (!kcdata_iter_valid(iter)) {
+ return NULL;
+ }
+
+ return (char *)kcdata_iter_payload(iter);
+}
+
+static __attribute__((noinline)) void
+launchd_crashed_panic(proc_t p, int rv)
+{
+ char *launchd_exit_reason_desc = launchd_exit_reason_get_string_desc(p->p_exit_reason);
+
+ if (p->p_exit_reason == OS_REASON_NULL) {
+ printf("pid 1 exited -- no exit reason available -- (signal %d, exit %d)\n",
+ WTERMSIG(rv), WEXITSTATUS(rv));
+ } else {
+ printf("pid 1 exited -- exit reason namespace %d subcode 0x%llx, description %s\n",
+ p->p_exit_reason->osr_namespace, p->p_exit_reason->osr_code, launchd_exit_reason_desc ?
+ launchd_exit_reason_desc : "none");
+ }
+
+ const char *launchd_crashed_prefix_str;
+
+ if (strnstr(p->p_name, "preinit", sizeof(p->p_name))) {
+ launchd_crashed_prefix_str = "LTE preinit process exited";
+ } else {
+ launchd_crashed_prefix_str = "initproc exited";
+ }
+
+#if (DEVELOPMENT || DEBUG) && CONFIG_COREDUMP
+ /*
+ * For debugging purposes, generate a core file of initproc before
+ * panicking. Leave at least 300 MB free on the root volume, and ignore
+ * the process's corefile ulimit. fsync() the file to ensure it lands on disk
+ * before the panic hits.
+ */
+
+ int err;
+ uint64_t coredump_start = mach_absolute_time();
+ uint64_t coredump_end;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+ uint32_t tv_msec;
+
+
+ err = coredump(p, 300, COREDUMP_IGNORE_ULIMIT | COREDUMP_FULLFSYNC);
+
+ coredump_end = mach_absolute_time();
+
+ absolutetime_to_microtime(coredump_end - coredump_start, &tv_sec, &tv_usec);
+
+ tv_msec = tv_usec / 1000;
+
+ if (err != 0) {
+ printf("Failed to generate initproc core file: error %d, took %d.%03d seconds\n",
+ err, (uint32_t)tv_sec, tv_msec);
+ } else {
+ printf("Generated initproc core file in %d.%03d seconds\n",
+ (uint32_t)tv_sec, tv_msec);
+ }
+#endif /* (DEVELOPMENT || DEBUG) && CONFIG_COREDUMP */
+
+ sync(p, (void *)NULL, (int *)NULL);
+
+ if (p->p_exit_reason == OS_REASON_NULL) {
+ panic_with_options(0, NULL, DEBUGGER_OPTION_INITPROC_PANIC, "%s -- no exit reason available -- (signal %d, exit status %d %s)",
+ launchd_crashed_prefix_str, WTERMSIG(rv), WEXITSTATUS(rv), ((p->p_csflags & CS_KILLED) ? "CS_KILLED" : ""));
+ } else {
+ panic_with_options(0, NULL, DEBUGGER_OPTION_INITPROC_PANIC, "%s %s -- exit reason namespace %d subcode 0x%llx description: %." LAUNCHD_PANIC_REASON_STRING_MAXLEN "s",
+ ((p->p_csflags & CS_KILLED) ? "CS_KILLED" : ""),
+ launchd_crashed_prefix_str, p->p_exit_reason->osr_namespace, p->p_exit_reason->osr_code,
+ launchd_exit_reason_desc ? launchd_exit_reason_desc : "none");
+ }
+}
+
+#define OS_REASON_IFLAG_USER_FAULT 0x1
+
+#define OS_REASON_TOTAL_USER_FAULTS_PER_PROC 5
+
+static int
+abort_with_payload_internal(proc_t p,
+ uint32_t reason_namespace, uint64_t reason_code,
+ user_addr_t payload, uint32_t payload_size,
+ user_addr_t reason_string, uint64_t reason_flags,
+ uint32_t internal_flags)
+{
+ os_reason_t exit_reason = OS_REASON_NULL;
+ kern_return_t kr = KERN_SUCCESS;
+
+ if (internal_flags & OS_REASON_IFLAG_USER_FAULT) {
+ uint32_t old_value = atomic_load_explicit(&p->p_user_faults,
+ memory_order_relaxed);
+ for (;;) {
+ if (old_value >= OS_REASON_TOTAL_USER_FAULTS_PER_PROC) {
+ return EQFULL;
+ }
+ // this reloads the value in old_value
+ if (atomic_compare_exchange_strong_explicit(&p->p_user_faults,
+ &old_value, old_value + 1, memory_order_relaxed,
+ memory_order_relaxed)) {
+ break;
+ }
+ }
+ }
+
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXITREASON_CREATE) | DBG_FUNC_NONE,
+ p->p_pid, reason_namespace,
+ reason_code, 0, 0);
+
+ exit_reason = build_userspace_exit_reason(reason_namespace, reason_code,
+ payload, payload_size, reason_string, reason_flags);
+
+ if (internal_flags & OS_REASON_IFLAG_USER_FAULT) {
+ mach_exception_code_t code = 0;
+
+ EXC_GUARD_ENCODE_TYPE(code, GUARD_TYPE_USER); /* simulated EXC_GUARD */
+ EXC_GUARD_ENCODE_FLAVOR(code, 0);
+ EXC_GUARD_ENCODE_TARGET(code, reason_namespace);
+
+ if (exit_reason == OS_REASON_NULL) {
+ kr = KERN_RESOURCE_SHORTAGE;
+ } else {
+ kr = task_violated_guard(code, reason_code, exit_reason);
+ }
+ os_reason_free(exit_reason);
+ } else {
+ /*
+ * We use SIGABRT (rather than calling exit directly from here) so that
+ * the debugger can catch abort_with_{reason,payload} calls.
+ */
+ psignal_try_thread_with_reason(p, current_thread(), SIGABRT, exit_reason);
+ }
+
+ switch (kr) {
+ case KERN_SUCCESS:
+ return 0;
+ case KERN_NOT_SUPPORTED:
+ return ENOTSUP;
+ case KERN_INVALID_ARGUMENT:
+ return EINVAL;
+ case KERN_RESOURCE_SHORTAGE:
+ default:
+ return EBUSY;
+ }
+}
+
+int
+abort_with_payload(struct proc *cur_proc, struct abort_with_payload_args *args,
+ __unused void *retval)
+{
+ abort_with_payload_internal(cur_proc, args->reason_namespace,
+ args->reason_code, args->payload, args->payload_size,
+ args->reason_string, args->reason_flags, 0);
+
+ return 0;
+}
+
+int
+os_fault_with_payload(struct proc *cur_proc,
+ struct os_fault_with_payload_args *args, __unused int *retval)
+{
+ return abort_with_payload_internal(cur_proc, args->reason_namespace,
+ args->reason_code, args->payload, args->payload_size,
+ args->reason_string, args->reason_flags, OS_REASON_IFLAG_USER_FAULT);
+}
+
+
/*
* exit --
* Death of process.
*/
+__attribute__((noreturn))
void
exit(proc_t p, struct exit_args *uap, int *retval)
{
+ p->p_xhighbits = ((uint32_t)(uap->rval) & 0xFF000000) >> 24;
exit1(p, W_EXITCODE(uap->rval, 0), retval);
thread_exception_return();
int
exit1_internal(proc_t p, int rv, int *retval, boolean_t thread_can_terminate, boolean_t perf_notify,
int jetsam_flags)
+{
+ return exit_with_reason(p, rv, retval, thread_can_terminate, perf_notify, jetsam_flags, OS_REASON_NULL);
+}
+
+/*
+ * NOTE: exit_with_reason drops a reference on the passed exit_reason
+ */
+int
+exit_with_reason(proc_t p, int rv, int *retval, boolean_t thread_can_terminate, boolean_t perf_notify,
+ int jetsam_flags, struct os_reason *exit_reason)
{
thread_t self = current_thread();
struct task *task = p->task;
*/
ut = get_bsdthread_info(self);
- if (ut->uu_flag & UT_VFORK) {
+ if ((p == current_proc()) &&
+ (ut->uu_flag & UT_VFORK)) {
+ os_reason_free(exit_reason);
if (!thread_can_terminate) {
return EINVAL;
}
* what the return value is.
*/
AUDIT_ARG(exit, WEXITSTATUS(rv), 0);
+ /*
+ * TODO: what to audit here when jetsam calls exit and the uthread,
+ * 'ut' does not belong to the proc, 'p'.
+ */
AUDIT_SYSCALL_EXIT(SYS_exit, p, ut, 0); /* Exit is always successfull */
DTRACE_PROC1(exit, int, CLD_EXITED);
/* mark process is going to exit and pull out of DBG/disk throttle */
/* TODO: This should be done after becoming exit thread */
- proc_set_task_policy(p->task, THREAD_NULL, TASK_POLICY_ATTRIBUTE,
+ proc_set_task_policy(p->task, TASK_POLICY_ATTRIBUTE,
TASK_POLICY_TERMINATED, TASK_POLICY_ENABLE);
proc_lock(p);
- error = proc_transstart(p, 1, ((jetsam_flags & P_JETSAM_VNODE) ? 1 : 0));
+ error = proc_transstart(p, 1, (jetsam_flags ? 1 : 0));
if (error == EDEADLK) {
- /* Temp: If deadlock error, then it implies multithreaded exec is
- * in progress. Instread of letting exit continue and
- * corrupting the freed memory, let the exit thread
- * return. This will save corruption in remote case.
+ /*
+ * If proc_transstart() returns EDEADLK, then another thread
+ * is either exec'ing or exiting. Return an error and allow
+ * the other thread to continue.
*/
proc_unlock(p);
+ os_reason_free(exit_reason);
if (current_proc() == p){
- if (p->exit_thread == self)
+ if (p->exit_thread == self) {
printf("exit_thread failed to exit, leaving process %s[%d] in unkillable limbo\n",
p->p_comm, p->p_pid);
- thread_exception_return();
- } else {
- /* external termination like jetsam */
- return(error);
+ }
+
+ if (thread_can_terminate) {
+ thread_exception_return();
+ }
}
+
+ return error;
}
while (p->exit_thread != self) {
if (sig_try_locked(p) <= 0) {
proc_transend(p, 1);
+ os_reason_free(exit_reason);
+
if (get_threadtask(self) != task) {
proc_unlock(p);
return(0);
}
sig_lock_to_exit(p);
}
- if (p == initproc && current_proc() == p) {
- proc_unlock(p);
- printf("pid 1 exited (signal %d, exit %d)",
- WTERMSIG(rv), WEXITSTATUS(rv));
-#if (DEVELOPMENT || DEBUG)
- int err;
- /*
- * For debugging purposes, generate a core file of initproc before
- * panicking. Leave at least 300 MB free on the root volume, and ignore
- * the process's corefile ulimit.
- */
- if ((err = coredump(p, 300, 1)) != 0) {
- printf("Failed to generate initproc core file: error %d", err);
- } else {
- printf("Generated initproc core file");
- sync(p, (void *)NULL, (int *)NULL);
- }
-#endif
- init_task_died = TRUE;
- panic("%s died\nState at Last Exception:\n\n%s",
- (p->p_comm[0] != '\0' ?
- p->p_comm :
- "launchd"),
- init_task_failure_data);
+
+ if (exit_reason != OS_REASON_NULL) {
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXITREASON_COMMIT) | DBG_FUNC_NONE,
+ p->p_pid, exit_reason->osr_namespace,
+ exit_reason->osr_code, 0, 0);
}
+ assert(p->p_exit_reason == OS_REASON_NULL);
+ p->p_exit_reason = exit_reason;
+
p->p_lflag |= P_LEXIT;
p->p_xstat = rv;
p->p_lflag |= jetsam_flags;
void
proc_prepareexit(proc_t p, int rv, boolean_t perf_notify)
{
- mach_exception_data_type_t code, subcode;
+ mach_exception_data_type_t code = 0, subcode = 0;
+
struct uthread *ut;
thread_t self = current_thread();
ut = get_bsdthread_info(self);
struct rusage_superset *rup;
+ int kr = 0;
+ int create_corpse = FALSE;
+
+ if (p == initproc) {
+ launchd_crashed_panic(p, rv);
+ /* NOTREACHED */
+ }
- /* If a core should be generated, notify crash reporter */
- if (hassigprop(WTERMSIG(rv), SA_CORE) || ((p->p_csflags & CS_KILLED) != 0)) {
+ /*
+ * Generate a corefile/crashlog if:
+ * The process doesn't have an exit reason that indicates no crash report should be created
+ * AND any of the following are true:
+ * - The process was terminated due to a fatal signal that generates a core
+ * - The process was killed due to a code signing violation
+ * - The process has an exit reason that indicates we should generate a crash report
+ *
+ * The first condition is necessary because abort_with_reason()/payload() use SIGABRT
+ * (which normally triggers a core) but may indicate that no crash report should be created.
+ */
+ if (!(PROC_HAS_EXITREASON(p) && (PROC_EXITREASON_FLAGS(p) & OS_REASON_FLAG_NO_CRASH_REPORT)) &&
+ (hassigprop(WTERMSIG(rv), SA_CORE) || ((p->p_csflags & CS_KILLED) != 0) ||
+ (PROC_HAS_EXITREASON(p) && (PROC_EXITREASON_FLAGS(p) &
+ OS_REASON_FLAG_GENERATE_CRASH_REPORT)))) {
/*
* Workaround for processes checking up on PT_DENY_ATTACH:
* should be backed out post-Leopard (details in 5431025).
((ut->uu_exception & 0x0f) << 20) |
((int)ut->uu_code & 0xfffff);
subcode = ut->uu_subcode;
- (void) task_exception_notify(EXC_CRASH, code, subcode);
+
+ kr = task_exception_notify(EXC_CRASH, code, subcode);
+
+ /* Nobody handled EXC_CRASH?? remember to make corpse */
+ if (kr != 0) {
+ create_corpse = TRUE;
+ }
}
skipcheck:
(void)sys_perf_notify(self, p->p_pid);
}
+
+ /* stash the usage into corpse data if making_corpse == true */
+ if (create_corpse == TRUE) {
+ kr = task_mark_corpse(p->task);
+ if (kr != KERN_SUCCESS) {
+ if (kr == KERN_NO_SPACE) {
+ printf("Process[%d] has no vm space for corpse info.\n", p->p_pid);
+ } else if (kr == KERN_NOT_SUPPORTED) {
+ printf("Process[%d] was destined to be corpse. But corpse is disabled by config.\n", p->p_pid);
+ } else {
+ printf("Process[%d] crashed: %s. Too many corpses being created.\n", p->p_pid, p->p_comm);
+ }
+ create_corpse = FALSE;
+ }
+ }
+
/*
* Before this process becomes a zombie, stash resource usage
* stats in the proc for external observers to query
*/
p->p_ru = rup;
}
+ if (create_corpse) {
+ int est_knotes = 0, num_knotes = 0;
+ uint64_t *buffer = NULL;
+ int buf_size = 0;
+
+ /* Get all the udata pointers from kqueue */
+ est_knotes = kevent_proc_copy_uptrs(p, NULL, 0);
+ if (est_knotes > 0) {
+ buf_size = (est_knotes + 32) * sizeof(uint64_t);
+ buffer = (uint64_t *) kalloc(buf_size);
+ num_knotes = kevent_proc_copy_uptrs(p, buffer, buf_size);
+ if (num_knotes > est_knotes + 32) {
+ num_knotes = est_knotes + 32;
+ }
+ }
+ /* Update the code, subcode based on exit reason */
+ proc_update_corpse_exception_codes(p, &code, &subcode);
+ populate_corpse_crashinfo(p, p->task, rup,
+ code, subcode, buffer, num_knotes, NULL);
+ if (buffer != NULL) {
+ kfree(buffer, buf_size);
+ }
+ }
/*
* Remove proc from allproc queue and from pidhash chain.
* Need to do this before we do anything that can block.
pid, exitval, 0, 0, 0);
#if CONFIG_DTRACE
- /*
- * Free any outstanding lazy dof entries. It is imperative we
- * always call dtrace_lazy_dofs_destroy, rather than null check
- * and call if !NULL. If we NULL test, during lazy dof faulting
- * we can race with the faulting code and proceed from here to
- * beyond the helpers cleanup. The lazy dof faulting will then
- * install new helpers which will never be cleaned up, and leak.
- */
- dtrace_lazy_dofs_destroy(p);
-
- /*
- * Clean up any DTrace helper actions or probes for the process.
- */
- if (p->p_dtrace_helpers != NULL) {
- (*dtrace_helpers_cleanup)(p);
- }
-
- /*
- * Clean up any DTrace probes associated with this process.
- */
- /*
- * APPLE NOTE: We release ptss pages/entries in dtrace_fasttrap_exit_ptr(),
- * call this after dtrace_helpers_cleanup()
- */
- proc_lock(p);
- if (p->p_dtrace_probes && dtrace_fasttrap_exit_ptr) {
- (*dtrace_fasttrap_exit_ptr)(p);
- }
- proc_unlock(p);
+ dtrace_proc_exit(p);
#endif
nspace_proc_exit(p);
-#if VM_PRESSURE_EVENTS
- vm_pressure_proc_cleanup(p);
-#endif
-
/*
* need to cancel async IO requests that can be cancelled and wait for those
* already active. MAY BLOCK!
task_clear_cpuusage(p->task, TRUE);
workqueue_mark_exiting(p);
- workqueue_exit(p);
_aio_exit( p );
*/
fdfree(p);
+ /*
+ * Once all the knotes, kqueues & workloops are destroyed, get rid of the
+ * workqueue.
+ */
+ workqueue_exit(p);
+
if (uth->uu_lowpri_window) {
/*
* task is marked as a low priority I/O type
*/
thread_resume(thread);
clear_wait(thread, THREAD_INTERRUPTED);
- threadsignal(thread, SIGKILL, 0);
+ threadsignal(thread, SIGKILL, 0, TRUE);
} else {
proc_unlock(q);
}
proc_childdrainend(p);
proc_list_unlock();
+#if CONFIG_MACF
+ /*
+ * Notify MAC policies that proc is dead.
+ * This should be replaced with proper label management
+ * (rdar://problem/32126399).
+ */
+ mac_proc_notify_exit(p);
+#endif
+
/*
* Release reference to text vnode
*/
}
}
- proc_spinlock(p);
- if (thread_call_cancel(p->p_rcall))
- p->p_ractive--;
-
- while (p->p_ractive > 0) {
- proc_spinunlock(p);
-
- delay(1);
-
- proc_spinlock(p);
- }
- proc_spinunlock(p);
-
- thread_call_free(p->p_rcall);
- p->p_rcall = NULL;
+ proc_free_realitimer(p);
/*
* Other substructures are freed from wait().
if (pp != initproc) {
proc_lock(pp);
pp->si_pid = p->p_pid;
+ pp->p_xhighbits = p->p_xhighbits;
+ p->p_xhighbits = 0;
pp->si_status = p->p_xstat;
pp->si_code = CLD_EXITED;
/*
* and refernce is dropped after these calls down below
* (locking protection is provided by list lock held in chgproccnt)
*/
+#if CONFIG_PERSONAS
+ /*
+ * persona_proc_drop calls chgproccnt(-1) on the persona uid,
+ * and (+1) on the child->p_ucred uid
+ */
+ persona_proc_drop(child);
+#endif
(void)chgproccnt(kauth_cred_getruid(child->p_ucred), -1);
-#if CONFIG_LCTX
- ALLLCTX_LOCK;
- leavelctx(child);
- ALLLCTX_UNLOCK;
-#endif
+ os_reason_free(child->p_exit_reason);
/*
* Free up credentials.
#if CONFIG_FINE_LOCK_GROUPS
lck_mtx_destroy(&child->p_mlock, proc_mlock_grp);
+ lck_mtx_destroy(&child->p_ucred_mlock, proc_ucred_mlock_grp);
lck_mtx_destroy(&child->p_fdmlock, proc_fdmlock_grp);
#if CONFIG_DTRACE
lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp);
lck_spin_destroy(&child->p_slock, proc_slock_grp);
#else /* CONFIG_FINE_LOCK_GROUPS */
lck_mtx_destroy(&child->p_mlock, proc_lck_grp);
+ lck_mtx_destroy(&child->p_ucred_mlock, proc_lck_grp);
lck_mtx_destroy(&child->p_fdmlock, proc_lck_grp);
#if CONFIG_DTRACE
lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp);
#endif
lck_spin_destroy(&child->p_slock, proc_lck_grp);
#endif /* CONFIG_FINE_LOCK_GROUPS */
- workqueue_destroy_lock(child);
FREE_ZONE(child, sizeof *child, M_PROC);
if ((locked == 1) && (droplock == 0))
nfound = 0;
sibling_count = 0;
- for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {
+ PCHILDREN_FOREACH(q, p) {
if ( p->p_sibling.le_next != 0 )
sibling_count++;
if (uap->pid != WAIT_ANY &&
proc_list_lock();
loop1:
nfound = 0;
- for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {
+ PCHILDREN_FOREACH(q, p) {
switch (uap->idtype) {
case P_PID: /* child with process ID equal to... */
if (p->p_pid != (pid_t)uap->id)
#endif
siginfo.si_signo = SIGCHLD;
siginfo.si_pid = p->p_pid;
- siginfo.si_status = WEXITSTATUS(p->p_xstat);
+ siginfo.si_status = (WEXITSTATUS(p->p_xstat) & 0x00FFFFFF) | (((uint32_t)(p->p_xhighbits) << 24) & 0xFF000000);
+ p->p_xhighbits = 0;
if (WIFSIGNALED(p->p_xstat)) {
siginfo.si_code = WCOREDUMP(p->p_xstat) ?
CLD_DUMPED : CLD_KILLED;
p->p_sigignore = ~0;
proc_unlock(p);
- proc_spinlock(p);
- if (thread_call_cancel(p->p_rcall))
- p->p_ractive--;
-
- while (p->p_ractive > 0) {
- proc_spinunlock(p);
-
- delay(1);
-
- proc_spinlock(p);
- }
- proc_spinunlock(p);
-
- thread_call_free(p->p_rcall);
- p->p_rcall = NULL;
-
ut->uu_siglist = 0;
- vproc_exit(p);
-}
+ /* begin vproc_exit */
-void
-vproc_exit(proc_t p)
-{
proc_t q;
proc_t pp;
-
+
vnode_t tvp;
-#ifdef FIXME
- struct task *task = p->task;
-#endif
+
struct pgrp * pg;
struct session *sessp;
struct rusage_superset *rup;
*/
thread_resume(thread);
clear_wait(thread, THREAD_INTERRUPTED);
- threadsignal(thread, SIGKILL, 0);
+ threadsignal(thread, SIGKILL, 0, TRUE);
} else {
proc_unlock(q);
}
pth_proc_hashdelete(p);
#endif /* PSYNCH */
+ proc_free_realitimer(p);
+
/*
* Other substructures are freed from wait().
*/
if (pp != initproc) {
proc_lock(pp);
pp->si_pid = p->p_pid;
+ pp->p_xhighbits = p->p_xhighbits;
+ p->p_xhighbits = 0;
pp->si_status = p->p_xstat;
pp->si_code = CLD_EXITED;
/*
projects / apple / xnu.git / blobdiff