1092 lines
35 KiB
C++
1092 lines
35 KiB
C++
//===-- sanitizer_mac.cc --------------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between various sanitizers' runtime libraries and
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// implements OSX-specific functions.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_MAC
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#include "sanitizer_mac.h"
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// Use 64-bit inodes in file operations. ASan does not support OS X 10.5, so
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// the clients will most certainly use 64-bit ones as well.
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#ifndef _DARWIN_USE_64_BIT_INODE
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#define _DARWIN_USE_64_BIT_INODE 1
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#endif
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#include <stdio.h>
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#include "sanitizer_common.h"
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#include "sanitizer_file.h"
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#include "sanitizer_flags.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_libc.h"
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#include "sanitizer_placement_new.h"
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#include "sanitizer_platform_limits_posix.h"
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#include "sanitizer_procmaps.h"
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#if !SANITIZER_IOS
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#include <crt_externs.h> // for _NSGetEnviron
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#else
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extern char **environ;
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#endif
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#if defined(__has_include) && __has_include(<os/trace.h>) && defined(__BLOCKS__)
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#define SANITIZER_OS_TRACE 1
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#include <os/trace.h>
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#else
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#define SANITIZER_OS_TRACE 0
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#endif
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#if !SANITIZER_IOS
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#include <crt_externs.h> // for _NSGetArgv and _NSGetEnviron
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#else
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extern "C" {
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extern char ***_NSGetArgv(void);
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}
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#endif
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#include <asl.h>
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#include <dlfcn.h> // for dladdr()
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#include <errno.h>
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#include <fcntl.h>
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#include <libkern/OSAtomic.h>
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#include <mach-o/dyld.h>
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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#include <mach/vm_statistics.h>
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#include <malloc/malloc.h>
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#include <pthread.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <util.h>
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// From <crt_externs.h>, but we don't have that file on iOS.
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extern "C" {
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extern char ***_NSGetArgv(void);
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extern char ***_NSGetEnviron(void);
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}
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// From <mach/mach_vm.h>, but we don't have that file on iOS.
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extern "C" {
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extern kern_return_t mach_vm_region_recurse(
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vm_map_t target_task,
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mach_vm_address_t *address,
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mach_vm_size_t *size,
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natural_t *nesting_depth,
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vm_region_recurse_info_t info,
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mach_msg_type_number_t *infoCnt);
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}
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namespace __sanitizer {
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#include "sanitizer_syscall_generic.inc"
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// Direct syscalls, don't call libmalloc hooks (but not available on 10.6).
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extern "C" void *__mmap(void *addr, size_t len, int prot, int flags, int fildes,
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off_t off) SANITIZER_WEAK_ATTRIBUTE;
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extern "C" int __munmap(void *, size_t) SANITIZER_WEAK_ATTRIBUTE;
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// ---------------------- sanitizer_libc.h
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// From <mach/vm_statistics.h>, but not on older OSs.
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#ifndef VM_MEMORY_SANITIZER
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#define VM_MEMORY_SANITIZER 99
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#endif
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uptr internal_mmap(void *addr, size_t length, int prot, int flags,
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int fd, u64 offset) {
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if (fd == -1) fd = VM_MAKE_TAG(VM_MEMORY_SANITIZER);
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if (&__mmap) return (uptr)__mmap(addr, length, prot, flags, fd, offset);
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return (uptr)mmap(addr, length, prot, flags, fd, offset);
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}
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uptr internal_munmap(void *addr, uptr length) {
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if (&__munmap) return __munmap(addr, length);
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return munmap(addr, length);
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}
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int internal_mprotect(void *addr, uptr length, int prot) {
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return mprotect(addr, length, prot);
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}
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uptr internal_close(fd_t fd) {
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return close(fd);
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}
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uptr internal_open(const char *filename, int flags) {
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return open(filename, flags);
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}
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uptr internal_open(const char *filename, int flags, u32 mode) {
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return open(filename, flags, mode);
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}
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uptr internal_read(fd_t fd, void *buf, uptr count) {
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return read(fd, buf, count);
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}
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uptr internal_write(fd_t fd, const void *buf, uptr count) {
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return write(fd, buf, count);
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}
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uptr internal_stat(const char *path, void *buf) {
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return stat(path, (struct stat *)buf);
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}
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uptr internal_lstat(const char *path, void *buf) {
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return lstat(path, (struct stat *)buf);
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}
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uptr internal_fstat(fd_t fd, void *buf) {
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return fstat(fd, (struct stat *)buf);
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}
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uptr internal_filesize(fd_t fd) {
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struct stat st;
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if (internal_fstat(fd, &st))
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return -1;
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return (uptr)st.st_size;
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}
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uptr internal_dup2(int oldfd, int newfd) {
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return dup2(oldfd, newfd);
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}
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uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
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return readlink(path, buf, bufsize);
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}
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uptr internal_unlink(const char *path) {
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return unlink(path);
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}
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uptr internal_sched_yield() {
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return sched_yield();
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}
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void internal__exit(int exitcode) {
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_exit(exitcode);
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}
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unsigned int internal_sleep(unsigned int seconds) {
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return sleep(seconds);
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}
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uptr internal_getpid() {
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return getpid();
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}
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int internal_sigaction(int signum, const void *act, void *oldact) {
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return sigaction(signum,
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(const struct sigaction *)act, (struct sigaction *)oldact);
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}
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void internal_sigfillset(__sanitizer_sigset_t *set) { sigfillset(set); }
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uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
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__sanitizer_sigset_t *oldset) {
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// Don't use sigprocmask here, because it affects all threads.
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return pthread_sigmask(how, set, oldset);
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}
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// Doesn't call pthread_atfork() handlers (but not available on 10.6).
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extern "C" pid_t __fork(void) SANITIZER_WEAK_ATTRIBUTE;
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int internal_fork() {
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if (&__fork)
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return __fork();
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return fork();
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}
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int internal_sysctl(const int *name, unsigned int namelen, void *oldp,
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uptr *oldlenp, const void *newp, uptr newlen) {
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return sysctl(const_cast<int *>(name), namelen, oldp, (size_t *)oldlenp,
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const_cast<void *>(newp), (size_t)newlen);
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}
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int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp,
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const void *newp, uptr newlen) {
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return sysctlbyname(sname, oldp, (size_t *)oldlenp, const_cast<void *>(newp),
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(size_t)newlen);
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}
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int internal_forkpty(int *amaster) {
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int master, slave;
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if (openpty(&master, &slave, nullptr, nullptr, nullptr) == -1) return -1;
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int pid = internal_fork();
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if (pid == -1) {
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close(master);
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close(slave);
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return -1;
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}
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if (pid == 0) {
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close(master);
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if (login_tty(slave) != 0) {
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// We already forked, there's not much we can do. Let's quit.
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Report("login_tty failed (errno %d)\n", errno);
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internal__exit(1);
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}
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} else {
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*amaster = master;
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close(slave);
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}
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return pid;
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}
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uptr internal_rename(const char *oldpath, const char *newpath) {
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return rename(oldpath, newpath);
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}
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uptr internal_ftruncate(fd_t fd, uptr size) {
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return ftruncate(fd, size);
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}
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uptr internal_execve(const char *filename, char *const argv[],
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char *const envp[]) {
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return execve(filename, argv, envp);
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}
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uptr internal_waitpid(int pid, int *status, int options) {
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return waitpid(pid, status, options);
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}
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// ----------------- sanitizer_common.h
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bool FileExists(const char *filename) {
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struct stat st;
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if (stat(filename, &st))
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return false;
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// Sanity check: filename is a regular file.
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return S_ISREG(st.st_mode);
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}
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tid_t GetTid() {
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tid_t tid;
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pthread_threadid_np(nullptr, &tid);
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return tid;
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}
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void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
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uptr *stack_bottom) {
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CHECK(stack_top);
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CHECK(stack_bottom);
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uptr stacksize = pthread_get_stacksize_np(pthread_self());
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// pthread_get_stacksize_np() returns an incorrect stack size for the main
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// thread on Mavericks. See
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// https://github.com/google/sanitizers/issues/261
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if ((GetMacosVersion() >= MACOS_VERSION_MAVERICKS) && at_initialization &&
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stacksize == (1 << 19)) {
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struct rlimit rl;
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CHECK_EQ(getrlimit(RLIMIT_STACK, &rl), 0);
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// Most often rl.rlim_cur will be the desired 8M.
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if (rl.rlim_cur < kMaxThreadStackSize) {
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stacksize = rl.rlim_cur;
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} else {
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stacksize = kMaxThreadStackSize;
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}
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}
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void *stackaddr = pthread_get_stackaddr_np(pthread_self());
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*stack_top = (uptr)stackaddr;
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*stack_bottom = *stack_top - stacksize;
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}
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char **GetEnviron() {
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#if !SANITIZER_IOS
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char ***env_ptr = _NSGetEnviron();
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if (!env_ptr) {
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Report("_NSGetEnviron() returned NULL. Please make sure __asan_init() is "
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"called after libSystem_initializer().\n");
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CHECK(env_ptr);
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}
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char **environ = *env_ptr;
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#endif
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CHECK(environ);
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return environ;
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}
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const char *GetEnv(const char *name) {
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char **env = GetEnviron();
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uptr name_len = internal_strlen(name);
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while (*env != 0) {
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uptr len = internal_strlen(*env);
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if (len > name_len) {
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const char *p = *env;
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if (!internal_memcmp(p, name, name_len) &&
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p[name_len] == '=') { // Match.
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return *env + name_len + 1; // String starting after =.
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}
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}
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env++;
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}
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return 0;
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}
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uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
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CHECK_LE(kMaxPathLength, buf_len);
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// On OS X the executable path is saved to the stack by dyld. Reading it
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// from there is much faster than calling dladdr, especially for large
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// binaries with symbols.
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InternalScopedString exe_path(kMaxPathLength);
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uint32_t size = exe_path.size();
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if (_NSGetExecutablePath(exe_path.data(), &size) == 0 &&
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realpath(exe_path.data(), buf) != 0) {
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return internal_strlen(buf);
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}
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return 0;
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}
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uptr ReadLongProcessName(/*out*/char *buf, uptr buf_len) {
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return ReadBinaryName(buf, buf_len);
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}
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void ReExec() {
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UNIMPLEMENTED();
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}
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void CheckASLR() {
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// Do nothing
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}
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uptr GetPageSize() {
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return sysconf(_SC_PAGESIZE);
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}
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extern "C" unsigned malloc_num_zones;
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extern "C" malloc_zone_t **malloc_zones;
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malloc_zone_t sanitizer_zone;
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// We need to make sure that sanitizer_zone is registered as malloc_zones[0]. If
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// libmalloc tries to set up a different zone as malloc_zones[0], it will call
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// mprotect(malloc_zones, ..., PROT_READ). This interceptor will catch that and
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// make sure we are still the first (default) zone.
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void MprotectMallocZones(void *addr, int prot) {
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if (addr == malloc_zones && prot == PROT_READ) {
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if (malloc_num_zones > 1 && malloc_zones[0] != &sanitizer_zone) {
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for (unsigned i = 1; i < malloc_num_zones; i++) {
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if (malloc_zones[i] == &sanitizer_zone) {
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// Swap malloc_zones[0] and malloc_zones[i].
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malloc_zones[i] = malloc_zones[0];
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malloc_zones[0] = &sanitizer_zone;
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break;
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}
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}
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}
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}
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}
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BlockingMutex::BlockingMutex() {
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internal_memset(this, 0, sizeof(*this));
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}
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void BlockingMutex::Lock() {
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CHECK(sizeof(OSSpinLock) <= sizeof(opaque_storage_));
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CHECK_EQ(OS_SPINLOCK_INIT, 0);
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CHECK_EQ(owner_, 0);
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OSSpinLockLock((OSSpinLock*)&opaque_storage_);
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}
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void BlockingMutex::Unlock() {
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OSSpinLockUnlock((OSSpinLock*)&opaque_storage_);
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}
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void BlockingMutex::CheckLocked() {
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CHECK_NE(*(OSSpinLock*)&opaque_storage_, 0);
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}
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u64 NanoTime() {
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timeval tv;
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internal_memset(&tv, 0, sizeof(tv));
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gettimeofday(&tv, 0);
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return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
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}
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// This needs to be called during initialization to avoid being racy.
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u64 MonotonicNanoTime() {
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static mach_timebase_info_data_t timebase_info;
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if (timebase_info.denom == 0) mach_timebase_info(&timebase_info);
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return (mach_absolute_time() * timebase_info.numer) / timebase_info.denom;
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}
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uptr GetTlsSize() {
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return 0;
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}
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void InitTlsSize() {
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}
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uptr TlsBaseAddr() {
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uptr segbase = 0;
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#if defined(__x86_64__)
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asm("movq %%gs:0,%0" : "=r"(segbase));
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#elif defined(__i386__)
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asm("movl %%gs:0,%0" : "=r"(segbase));
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#endif
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return segbase;
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}
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// The size of the tls on darwin does not appear to be well documented,
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// however the vm memory map suggests that it is 1024 uptrs in size,
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// with a size of 0x2000 bytes on x86_64 and 0x1000 bytes on i386.
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uptr TlsSize() {
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#if defined(__x86_64__) || defined(__i386__)
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return 1024 * sizeof(uptr);
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#else
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return 0;
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#endif
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}
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void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
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uptr *tls_addr, uptr *tls_size) {
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#if !SANITIZER_GO
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uptr stack_top, stack_bottom;
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GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
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*stk_addr = stack_bottom;
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*stk_size = stack_top - stack_bottom;
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*tls_addr = TlsBaseAddr();
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*tls_size = TlsSize();
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#else
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*stk_addr = 0;
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*stk_size = 0;
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*tls_addr = 0;
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*tls_size = 0;
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#endif
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}
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void ListOfModules::init() {
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clearOrInit();
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MemoryMappingLayout memory_mapping(false);
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memory_mapping.DumpListOfModules(&modules_);
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}
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void ListOfModules::fallbackInit() { clear(); }
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static HandleSignalMode GetHandleSignalModeImpl(int signum) {
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switch (signum) {
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case SIGABRT:
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return common_flags()->handle_abort;
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case SIGILL:
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return common_flags()->handle_sigill;
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case SIGTRAP:
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return common_flags()->handle_sigtrap;
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case SIGFPE:
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return common_flags()->handle_sigfpe;
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case SIGSEGV:
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return common_flags()->handle_segv;
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case SIGBUS:
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return common_flags()->handle_sigbus;
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}
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return kHandleSignalNo;
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}
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HandleSignalMode GetHandleSignalMode(int signum) {
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// Handling fatal signals on watchOS and tvOS devices is disallowed.
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if ((SANITIZER_WATCHOS || SANITIZER_TVOS) && !(SANITIZER_IOSSIM))
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return kHandleSignalNo;
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HandleSignalMode result = GetHandleSignalModeImpl(signum);
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if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler)
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return kHandleSignalExclusive;
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return result;
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}
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MacosVersion cached_macos_version = MACOS_VERSION_UNINITIALIZED;
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MacosVersion GetMacosVersionInternal() {
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int mib[2] = { CTL_KERN, KERN_OSRELEASE };
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char version[100];
|
|
uptr len = 0, maxlen = sizeof(version) / sizeof(version[0]);
|
|
for (uptr i = 0; i < maxlen; i++) version[i] = '\0';
|
|
// Get the version length.
|
|
CHECK_NE(internal_sysctl(mib, 2, 0, &len, 0, 0), -1);
|
|
CHECK_LT(len, maxlen);
|
|
CHECK_NE(internal_sysctl(mib, 2, version, &len, 0, 0), -1);
|
|
switch (version[0]) {
|
|
case '9': return MACOS_VERSION_LEOPARD;
|
|
case '1': {
|
|
switch (version[1]) {
|
|
case '0': return MACOS_VERSION_SNOW_LEOPARD;
|
|
case '1': return MACOS_VERSION_LION;
|
|
case '2': return MACOS_VERSION_MOUNTAIN_LION;
|
|
case '3': return MACOS_VERSION_MAVERICKS;
|
|
case '4': return MACOS_VERSION_YOSEMITE;
|
|
case '5': return MACOS_VERSION_EL_CAPITAN;
|
|
case '6': return MACOS_VERSION_SIERRA;
|
|
case '7': return MACOS_VERSION_HIGH_SIERRA;
|
|
case '8': return MACOS_VERSION_MOJAVE;
|
|
default:
|
|
if (IsDigit(version[1]))
|
|
return MACOS_VERSION_UNKNOWN_NEWER;
|
|
else
|
|
return MACOS_VERSION_UNKNOWN;
|
|
}
|
|
}
|
|
default: return MACOS_VERSION_UNKNOWN;
|
|
}
|
|
}
|
|
|
|
MacosVersion GetMacosVersion() {
|
|
atomic_uint32_t *cache =
|
|
reinterpret_cast<atomic_uint32_t*>(&cached_macos_version);
|
|
MacosVersion result =
|
|
static_cast<MacosVersion>(atomic_load(cache, memory_order_acquire));
|
|
if (result == MACOS_VERSION_UNINITIALIZED) {
|
|
result = GetMacosVersionInternal();
|
|
atomic_store(cache, result, memory_order_release);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
bool PlatformHasDifferentMemcpyAndMemmove() {
|
|
// On OS X 10.7 memcpy() and memmove() are both resolved
|
|
// into memmove$VARIANT$sse42.
|
|
// See also https://github.com/google/sanitizers/issues/34.
|
|
// TODO(glider): need to check dynamically that memcpy() and memmove() are
|
|
// actually the same function.
|
|
return GetMacosVersion() == MACOS_VERSION_SNOW_LEOPARD;
|
|
}
|
|
|
|
uptr GetRSS() {
|
|
struct task_basic_info info;
|
|
unsigned count = TASK_BASIC_INFO_COUNT;
|
|
kern_return_t result =
|
|
task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)&info, &count);
|
|
if (UNLIKELY(result != KERN_SUCCESS)) {
|
|
Report("Cannot get task info. Error: %d\n", result);
|
|
Die();
|
|
}
|
|
return info.resident_size;
|
|
}
|
|
|
|
void *internal_start_thread(void(*func)(void *arg), void *arg) {
|
|
// Start the thread with signals blocked, otherwise it can steal user signals.
|
|
__sanitizer_sigset_t set, old;
|
|
internal_sigfillset(&set);
|
|
internal_sigprocmask(SIG_SETMASK, &set, &old);
|
|
pthread_t th;
|
|
pthread_create(&th, 0, (void*(*)(void *arg))func, arg);
|
|
internal_sigprocmask(SIG_SETMASK, &old, 0);
|
|
return th;
|
|
}
|
|
|
|
void internal_join_thread(void *th) { pthread_join((pthread_t)th, 0); }
|
|
|
|
#if !SANITIZER_GO
|
|
static BlockingMutex syslog_lock(LINKER_INITIALIZED);
|
|
#endif
|
|
|
|
void WriteOneLineToSyslog(const char *s) {
|
|
#if !SANITIZER_GO
|
|
syslog_lock.CheckLocked();
|
|
asl_log(nullptr, nullptr, ASL_LEVEL_ERR, "%s", s);
|
|
#endif
|
|
}
|
|
|
|
void LogMessageOnPrintf(const char *str) {
|
|
// Log all printf output to CrashLog.
|
|
if (common_flags()->abort_on_error)
|
|
CRAppendCrashLogMessage(str);
|
|
}
|
|
|
|
void LogFullErrorReport(const char *buffer) {
|
|
#if !SANITIZER_GO
|
|
// Log with os_trace. This will make it into the crash log.
|
|
#if SANITIZER_OS_TRACE
|
|
if (GetMacosVersion() >= MACOS_VERSION_YOSEMITE) {
|
|
// os_trace requires the message (format parameter) to be a string literal.
|
|
if (internal_strncmp(SanitizerToolName, "AddressSanitizer",
|
|
sizeof("AddressSanitizer") - 1) == 0)
|
|
os_trace("Address Sanitizer reported a failure.");
|
|
else if (internal_strncmp(SanitizerToolName, "UndefinedBehaviorSanitizer",
|
|
sizeof("UndefinedBehaviorSanitizer") - 1) == 0)
|
|
os_trace("Undefined Behavior Sanitizer reported a failure.");
|
|
else if (internal_strncmp(SanitizerToolName, "ThreadSanitizer",
|
|
sizeof("ThreadSanitizer") - 1) == 0)
|
|
os_trace("Thread Sanitizer reported a failure.");
|
|
else
|
|
os_trace("Sanitizer tool reported a failure.");
|
|
|
|
if (common_flags()->log_to_syslog)
|
|
os_trace("Consult syslog for more information.");
|
|
}
|
|
#endif
|
|
|
|
// Log to syslog.
|
|
// The logging on OS X may call pthread_create so we need the threading
|
|
// environment to be fully initialized. Also, this should never be called when
|
|
// holding the thread registry lock since that may result in a deadlock. If
|
|
// the reporting thread holds the thread registry mutex, and asl_log waits
|
|
// for GCD to dispatch a new thread, the process will deadlock, because the
|
|
// pthread_create wrapper needs to acquire the lock as well.
|
|
BlockingMutexLock l(&syslog_lock);
|
|
if (common_flags()->log_to_syslog)
|
|
WriteToSyslog(buffer);
|
|
|
|
// The report is added to CrashLog as part of logging all of Printf output.
|
|
#endif
|
|
}
|
|
|
|
SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
|
|
#if defined(__x86_64__) || defined(__i386__)
|
|
ucontext_t *ucontext = static_cast<ucontext_t*>(context);
|
|
return ucontext->uc_mcontext->__es.__err & 2 /*T_PF_WRITE*/ ? WRITE : READ;
|
|
#else
|
|
return UNKNOWN;
|
|
#endif
|
|
}
|
|
|
|
static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
|
|
ucontext_t *ucontext = (ucontext_t*)context;
|
|
# if defined(__aarch64__)
|
|
*pc = ucontext->uc_mcontext->__ss.__pc;
|
|
# if defined(__IPHONE_8_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_8_0
|
|
*bp = ucontext->uc_mcontext->__ss.__fp;
|
|
# else
|
|
*bp = ucontext->uc_mcontext->__ss.__lr;
|
|
# endif
|
|
*sp = ucontext->uc_mcontext->__ss.__sp;
|
|
# elif defined(__x86_64__)
|
|
*pc = ucontext->uc_mcontext->__ss.__rip;
|
|
*bp = ucontext->uc_mcontext->__ss.__rbp;
|
|
*sp = ucontext->uc_mcontext->__ss.__rsp;
|
|
# elif defined(__arm__)
|
|
*pc = ucontext->uc_mcontext->__ss.__pc;
|
|
*bp = ucontext->uc_mcontext->__ss.__r[7];
|
|
*sp = ucontext->uc_mcontext->__ss.__sp;
|
|
# elif defined(__i386__)
|
|
*pc = ucontext->uc_mcontext->__ss.__eip;
|
|
*bp = ucontext->uc_mcontext->__ss.__ebp;
|
|
*sp = ucontext->uc_mcontext->__ss.__esp;
|
|
# else
|
|
# error "Unknown architecture"
|
|
# endif
|
|
}
|
|
|
|
void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); }
|
|
|
|
#if !SANITIZER_GO
|
|
static const char kDyldInsertLibraries[] = "DYLD_INSERT_LIBRARIES";
|
|
LowLevelAllocator allocator_for_env;
|
|
|
|
// Change the value of the env var |name|, leaking the original value.
|
|
// If |name_value| is NULL, the variable is deleted from the environment,
|
|
// otherwise the corresponding "NAME=value" string is replaced with
|
|
// |name_value|.
|
|
void LeakyResetEnv(const char *name, const char *name_value) {
|
|
char **env = GetEnviron();
|
|
uptr name_len = internal_strlen(name);
|
|
while (*env != 0) {
|
|
uptr len = internal_strlen(*env);
|
|
if (len > name_len) {
|
|
const char *p = *env;
|
|
if (!internal_memcmp(p, name, name_len) && p[name_len] == '=') {
|
|
// Match.
|
|
if (name_value) {
|
|
// Replace the old value with the new one.
|
|
*env = const_cast<char*>(name_value);
|
|
} else {
|
|
// Shift the subsequent pointers back.
|
|
char **del = env;
|
|
do {
|
|
del[0] = del[1];
|
|
} while (*del++);
|
|
}
|
|
}
|
|
}
|
|
env++;
|
|
}
|
|
}
|
|
|
|
SANITIZER_WEAK_CXX_DEFAULT_IMPL
|
|
bool ReexecDisabled() {
|
|
return false;
|
|
}
|
|
|
|
extern "C" SANITIZER_WEAK_ATTRIBUTE double dyldVersionNumber;
|
|
static const double kMinDyldVersionWithAutoInterposition = 360.0;
|
|
|
|
bool DyldNeedsEnvVariable() {
|
|
// Although sanitizer support was added to LLVM on OS X 10.7+, GCC users
|
|
// still may want use them on older systems. On older Darwin platforms, dyld
|
|
// doesn't export dyldVersionNumber symbol and we simply return true.
|
|
if (!&dyldVersionNumber) return true;
|
|
// If running on OS X 10.11+ or iOS 9.0+, dyld will interpose even if
|
|
// DYLD_INSERT_LIBRARIES is not set. However, checking OS version via
|
|
// GetMacosVersion() doesn't work for the simulator. Let's instead check
|
|
// `dyldVersionNumber`, which is exported by dyld, against a known version
|
|
// number from the first OS release where this appeared.
|
|
return dyldVersionNumber < kMinDyldVersionWithAutoInterposition;
|
|
}
|
|
|
|
void MaybeReexec() {
|
|
// FIXME: This should really live in some "InitializePlatform" method.
|
|
MonotonicNanoTime();
|
|
|
|
if (ReexecDisabled()) return;
|
|
|
|
// Make sure the dynamic runtime library is preloaded so that the
|
|
// wrappers work. If it is not, set DYLD_INSERT_LIBRARIES and re-exec
|
|
// ourselves.
|
|
Dl_info info;
|
|
RAW_CHECK(dladdr((void*)((uptr)&__sanitizer_report_error_summary), &info));
|
|
char *dyld_insert_libraries =
|
|
const_cast<char*>(GetEnv(kDyldInsertLibraries));
|
|
uptr old_env_len = dyld_insert_libraries ?
|
|
internal_strlen(dyld_insert_libraries) : 0;
|
|
uptr fname_len = internal_strlen(info.dli_fname);
|
|
const char *dylib_name = StripModuleName(info.dli_fname);
|
|
uptr dylib_name_len = internal_strlen(dylib_name);
|
|
|
|
bool lib_is_in_env = dyld_insert_libraries &&
|
|
internal_strstr(dyld_insert_libraries, dylib_name);
|
|
if (DyldNeedsEnvVariable() && !lib_is_in_env) {
|
|
// DYLD_INSERT_LIBRARIES is not set or does not contain the runtime
|
|
// library.
|
|
InternalScopedString program_name(1024);
|
|
uint32_t buf_size = program_name.size();
|
|
_NSGetExecutablePath(program_name.data(), &buf_size);
|
|
char *new_env = const_cast<char*>(info.dli_fname);
|
|
if (dyld_insert_libraries) {
|
|
// Append the runtime dylib name to the existing value of
|
|
// DYLD_INSERT_LIBRARIES.
|
|
new_env = (char*)allocator_for_env.Allocate(old_env_len + fname_len + 2);
|
|
internal_strncpy(new_env, dyld_insert_libraries, old_env_len);
|
|
new_env[old_env_len] = ':';
|
|
// Copy fname_len and add a trailing zero.
|
|
internal_strncpy(new_env + old_env_len + 1, info.dli_fname,
|
|
fname_len + 1);
|
|
// Ok to use setenv() since the wrappers don't depend on the value of
|
|
// asan_inited.
|
|
setenv(kDyldInsertLibraries, new_env, /*overwrite*/1);
|
|
} else {
|
|
// Set DYLD_INSERT_LIBRARIES equal to the runtime dylib name.
|
|
setenv(kDyldInsertLibraries, info.dli_fname, /*overwrite*/0);
|
|
}
|
|
VReport(1, "exec()-ing the program with\n");
|
|
VReport(1, "%s=%s\n", kDyldInsertLibraries, new_env);
|
|
VReport(1, "to enable wrappers.\n");
|
|
execv(program_name.data(), *_NSGetArgv());
|
|
|
|
// We get here only if execv() failed.
|
|
Report("ERROR: The process is launched without DYLD_INSERT_LIBRARIES, "
|
|
"which is required for the sanitizer to work. We tried to set the "
|
|
"environment variable and re-execute itself, but execv() failed, "
|
|
"possibly because of sandbox restrictions. Make sure to launch the "
|
|
"executable with:\n%s=%s\n", kDyldInsertLibraries, new_env);
|
|
RAW_CHECK("execv failed" && 0);
|
|
}
|
|
|
|
// Verify that interceptors really work. We'll use dlsym to locate
|
|
// "pthread_create", if interceptors are working, it should really point to
|
|
// "wrap_pthread_create" within our own dylib.
|
|
Dl_info info_pthread_create;
|
|
void *dlopen_addr = dlsym(RTLD_DEFAULT, "pthread_create");
|
|
RAW_CHECK(dladdr(dlopen_addr, &info_pthread_create));
|
|
if (internal_strcmp(info.dli_fname, info_pthread_create.dli_fname) != 0) {
|
|
Report(
|
|
"ERROR: Interceptors are not working. This may be because %s is "
|
|
"loaded too late (e.g. via dlopen). Please launch the executable "
|
|
"with:\n%s=%s\n",
|
|
SanitizerToolName, kDyldInsertLibraries, info.dli_fname);
|
|
RAW_CHECK("interceptors not installed" && 0);
|
|
}
|
|
|
|
if (!lib_is_in_env)
|
|
return;
|
|
|
|
if (!common_flags()->strip_env)
|
|
return;
|
|
|
|
// DYLD_INSERT_LIBRARIES is set and contains the runtime library. Let's remove
|
|
// the dylib from the environment variable, because interceptors are installed
|
|
// and we don't want our children to inherit the variable.
|
|
|
|
uptr env_name_len = internal_strlen(kDyldInsertLibraries);
|
|
// Allocate memory to hold the previous env var name, its value, the '='
|
|
// sign and the '\0' char.
|
|
char *new_env = (char*)allocator_for_env.Allocate(
|
|
old_env_len + 2 + env_name_len);
|
|
RAW_CHECK(new_env);
|
|
internal_memset(new_env, '\0', old_env_len + 2 + env_name_len);
|
|
internal_strncpy(new_env, kDyldInsertLibraries, env_name_len);
|
|
new_env[env_name_len] = '=';
|
|
char *new_env_pos = new_env + env_name_len + 1;
|
|
|
|
// Iterate over colon-separated pieces of |dyld_insert_libraries|.
|
|
char *piece_start = dyld_insert_libraries;
|
|
char *piece_end = NULL;
|
|
char *old_env_end = dyld_insert_libraries + old_env_len;
|
|
do {
|
|
if (piece_start[0] == ':') piece_start++;
|
|
piece_end = internal_strchr(piece_start, ':');
|
|
if (!piece_end) piece_end = dyld_insert_libraries + old_env_len;
|
|
if ((uptr)(piece_start - dyld_insert_libraries) > old_env_len) break;
|
|
uptr piece_len = piece_end - piece_start;
|
|
|
|
char *filename_start =
|
|
(char *)internal_memrchr(piece_start, '/', piece_len);
|
|
uptr filename_len = piece_len;
|
|
if (filename_start) {
|
|
filename_start += 1;
|
|
filename_len = piece_len - (filename_start - piece_start);
|
|
} else {
|
|
filename_start = piece_start;
|
|
}
|
|
|
|
// If the current piece isn't the runtime library name,
|
|
// append it to new_env.
|
|
if ((dylib_name_len != filename_len) ||
|
|
(internal_memcmp(filename_start, dylib_name, dylib_name_len) != 0)) {
|
|
if (new_env_pos != new_env + env_name_len + 1) {
|
|
new_env_pos[0] = ':';
|
|
new_env_pos++;
|
|
}
|
|
internal_strncpy(new_env_pos, piece_start, piece_len);
|
|
new_env_pos += piece_len;
|
|
}
|
|
// Move on to the next piece.
|
|
piece_start = piece_end;
|
|
} while (piece_start < old_env_end);
|
|
|
|
// Can't use setenv() here, because it requires the allocator to be
|
|
// initialized.
|
|
// FIXME: instead of filtering DYLD_INSERT_LIBRARIES here, do it in
|
|
// a separate function called after InitializeAllocator().
|
|
if (new_env_pos == new_env + env_name_len + 1) new_env = NULL;
|
|
LeakyResetEnv(kDyldInsertLibraries, new_env);
|
|
}
|
|
#endif // SANITIZER_GO
|
|
|
|
char **GetArgv() {
|
|
return *_NSGetArgv();
|
|
}
|
|
|
|
#if defined(__aarch64__) && SANITIZER_IOS && !SANITIZER_IOSSIM
|
|
// The task_vm_info struct is normally provided by the macOS SDK, but we need
|
|
// fields only available in 10.12+. Declare the struct manually to be able to
|
|
// build against older SDKs.
|
|
struct __sanitizer_task_vm_info {
|
|
mach_vm_size_t virtual_size;
|
|
integer_t region_count;
|
|
integer_t page_size;
|
|
mach_vm_size_t resident_size;
|
|
mach_vm_size_t resident_size_peak;
|
|
mach_vm_size_t device;
|
|
mach_vm_size_t device_peak;
|
|
mach_vm_size_t internal;
|
|
mach_vm_size_t internal_peak;
|
|
mach_vm_size_t external;
|
|
mach_vm_size_t external_peak;
|
|
mach_vm_size_t reusable;
|
|
mach_vm_size_t reusable_peak;
|
|
mach_vm_size_t purgeable_volatile_pmap;
|
|
mach_vm_size_t purgeable_volatile_resident;
|
|
mach_vm_size_t purgeable_volatile_virtual;
|
|
mach_vm_size_t compressed;
|
|
mach_vm_size_t compressed_peak;
|
|
mach_vm_size_t compressed_lifetime;
|
|
mach_vm_size_t phys_footprint;
|
|
mach_vm_address_t min_address;
|
|
mach_vm_address_t max_address;
|
|
};
|
|
#define __SANITIZER_TASK_VM_INFO_COUNT ((mach_msg_type_number_t) \
|
|
(sizeof(__sanitizer_task_vm_info) / sizeof(natural_t)))
|
|
|
|
uptr GetTaskInfoMaxAddress() {
|
|
__sanitizer_task_vm_info vm_info = {} /* zero initialize */;
|
|
mach_msg_type_number_t count = __SANITIZER_TASK_VM_INFO_COUNT;
|
|
int err = task_info(mach_task_self(), TASK_VM_INFO, (int *)&vm_info, &count);
|
|
if (err == 0 && vm_info.max_address != 0) {
|
|
return vm_info.max_address - 1;
|
|
} else {
|
|
// xnu cannot provide vm address limit
|
|
return 0x200000000 - 1;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
uptr GetMaxUserVirtualAddress() {
|
|
#if SANITIZER_WORDSIZE == 64
|
|
# if defined(__aarch64__) && SANITIZER_IOS && !SANITIZER_IOSSIM
|
|
// Get the maximum VM address
|
|
static uptr max_vm = GetTaskInfoMaxAddress();
|
|
CHECK(max_vm);
|
|
return max_vm;
|
|
# else
|
|
return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
|
|
# endif
|
|
#else // SANITIZER_WORDSIZE == 32
|
|
return (1ULL << 32) - 1; // 0xffffffff;
|
|
#endif // SANITIZER_WORDSIZE
|
|
}
|
|
|
|
uptr GetMaxVirtualAddress() {
|
|
return GetMaxUserVirtualAddress();
|
|
}
|
|
|
|
uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
|
|
uptr *largest_gap_found,
|
|
uptr *max_occupied_addr) {
|
|
typedef vm_region_submap_short_info_data_64_t RegionInfo;
|
|
enum { kRegionInfoSize = VM_REGION_SUBMAP_SHORT_INFO_COUNT_64 };
|
|
// Start searching for available memory region past PAGEZERO, which is
|
|
// 4KB on 32-bit and 4GB on 64-bit.
|
|
mach_vm_address_t start_address =
|
|
(SANITIZER_WORDSIZE == 32) ? 0x000000001000 : 0x000100000000;
|
|
|
|
mach_vm_address_t address = start_address;
|
|
mach_vm_address_t free_begin = start_address;
|
|
kern_return_t kr = KERN_SUCCESS;
|
|
if (largest_gap_found) *largest_gap_found = 0;
|
|
if (max_occupied_addr) *max_occupied_addr = 0;
|
|
while (kr == KERN_SUCCESS) {
|
|
mach_vm_size_t vmsize = 0;
|
|
natural_t depth = 0;
|
|
RegionInfo vminfo;
|
|
mach_msg_type_number_t count = kRegionInfoSize;
|
|
kr = mach_vm_region_recurse(mach_task_self(), &address, &vmsize, &depth,
|
|
(vm_region_info_t)&vminfo, &count);
|
|
if (kr == KERN_INVALID_ADDRESS) {
|
|
// No more regions beyond "address", consider the gap at the end of VM.
|
|
address = GetMaxVirtualAddress() + 1;
|
|
vmsize = 0;
|
|
} else {
|
|
if (max_occupied_addr) *max_occupied_addr = address + vmsize;
|
|
}
|
|
if (free_begin != address) {
|
|
// We found a free region [free_begin..address-1].
|
|
uptr gap_start = RoundUpTo((uptr)free_begin + left_padding, alignment);
|
|
uptr gap_end = RoundDownTo((uptr)address, alignment);
|
|
uptr gap_size = gap_end > gap_start ? gap_end - gap_start : 0;
|
|
if (size < gap_size) {
|
|
return gap_start;
|
|
}
|
|
|
|
if (largest_gap_found && *largest_gap_found < gap_size) {
|
|
*largest_gap_found = gap_size;
|
|
}
|
|
}
|
|
// Move to the next region.
|
|
address += vmsize;
|
|
free_begin = address;
|
|
}
|
|
|
|
// We looked at all free regions and could not find one large enough.
|
|
return 0;
|
|
}
|
|
|
|
// FIXME implement on this platform.
|
|
void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size) { }
|
|
|
|
void SignalContext::DumpAllRegisters(void *context) {
|
|
Report("Register values:\n");
|
|
|
|
ucontext_t *ucontext = (ucontext_t*)context;
|
|
# define DUMPREG64(r) \
|
|
Printf("%s = 0x%016llx ", #r, ucontext->uc_mcontext->__ss.__ ## r);
|
|
# define DUMPREG32(r) \
|
|
Printf("%s = 0x%08x ", #r, ucontext->uc_mcontext->__ss.__ ## r);
|
|
# define DUMPREG_(r) Printf(" "); DUMPREG(r);
|
|
# define DUMPREG__(r) Printf(" "); DUMPREG(r);
|
|
# define DUMPREG___(r) Printf(" "); DUMPREG(r);
|
|
|
|
# if defined(__x86_64__)
|
|
# define DUMPREG(r) DUMPREG64(r)
|
|
DUMPREG(rax); DUMPREG(rbx); DUMPREG(rcx); DUMPREG(rdx); Printf("\n");
|
|
DUMPREG(rdi); DUMPREG(rsi); DUMPREG(rbp); DUMPREG(rsp); Printf("\n");
|
|
DUMPREG_(r8); DUMPREG_(r9); DUMPREG(r10); DUMPREG(r11); Printf("\n");
|
|
DUMPREG(r12); DUMPREG(r13); DUMPREG(r14); DUMPREG(r15); Printf("\n");
|
|
# elif defined(__i386__)
|
|
# define DUMPREG(r) DUMPREG32(r)
|
|
DUMPREG(eax); DUMPREG(ebx); DUMPREG(ecx); DUMPREG(edx); Printf("\n");
|
|
DUMPREG(edi); DUMPREG(esi); DUMPREG(ebp); DUMPREG(esp); Printf("\n");
|
|
# elif defined(__aarch64__)
|
|
# define DUMPREG(r) DUMPREG64(r)
|
|
DUMPREG_(x[0]); DUMPREG_(x[1]); DUMPREG_(x[2]); DUMPREG_(x[3]); Printf("\n");
|
|
DUMPREG_(x[4]); DUMPREG_(x[5]); DUMPREG_(x[6]); DUMPREG_(x[7]); Printf("\n");
|
|
DUMPREG_(x[8]); DUMPREG_(x[9]); DUMPREG(x[10]); DUMPREG(x[11]); Printf("\n");
|
|
DUMPREG(x[12]); DUMPREG(x[13]); DUMPREG(x[14]); DUMPREG(x[15]); Printf("\n");
|
|
DUMPREG(x[16]); DUMPREG(x[17]); DUMPREG(x[18]); DUMPREG(x[19]); Printf("\n");
|
|
DUMPREG(x[20]); DUMPREG(x[21]); DUMPREG(x[22]); DUMPREG(x[23]); Printf("\n");
|
|
DUMPREG(x[24]); DUMPREG(x[25]); DUMPREG(x[26]); DUMPREG(x[27]); Printf("\n");
|
|
DUMPREG(x[28]); DUMPREG___(fp); DUMPREG___(lr); DUMPREG___(sp); Printf("\n");
|
|
# elif defined(__arm__)
|
|
# define DUMPREG(r) DUMPREG32(r)
|
|
DUMPREG_(r[0]); DUMPREG_(r[1]); DUMPREG_(r[2]); DUMPREG_(r[3]); Printf("\n");
|
|
DUMPREG_(r[4]); DUMPREG_(r[5]); DUMPREG_(r[6]); DUMPREG_(r[7]); Printf("\n");
|
|
DUMPREG_(r[8]); DUMPREG_(r[9]); DUMPREG(r[10]); DUMPREG(r[11]); Printf("\n");
|
|
DUMPREG(r[12]); DUMPREG___(sp); DUMPREG___(lr); DUMPREG___(pc); Printf("\n");
|
|
# else
|
|
# error "Unknown architecture"
|
|
# endif
|
|
|
|
# undef DUMPREG64
|
|
# undef DUMPREG32
|
|
# undef DUMPREG_
|
|
# undef DUMPREG__
|
|
# undef DUMPREG___
|
|
# undef DUMPREG
|
|
}
|
|
|
|
static inline bool CompareBaseAddress(const LoadedModule &a,
|
|
const LoadedModule &b) {
|
|
return a.base_address() < b.base_address();
|
|
}
|
|
|
|
void FormatUUID(char *out, uptr size, const u8 *uuid) {
|
|
internal_snprintf(out, size,
|
|
"<%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-"
|
|
"%02X%02X%02X%02X%02X%02X>",
|
|
uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
|
|
uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
|
|
uuid[12], uuid[13], uuid[14], uuid[15]);
|
|
}
|
|
|
|
void PrintModuleMap() {
|
|
Printf("Process module map:\n");
|
|
MemoryMappingLayout memory_mapping(false);
|
|
InternalMmapVector<LoadedModule> modules;
|
|
modules.reserve(128);
|
|
memory_mapping.DumpListOfModules(&modules);
|
|
Sort(modules.data(), modules.size(), CompareBaseAddress);
|
|
for (uptr i = 0; i < modules.size(); ++i) {
|
|
char uuid_str[128];
|
|
FormatUUID(uuid_str, sizeof(uuid_str), modules[i].uuid());
|
|
Printf("0x%zx-0x%zx %s (%s) %s\n", modules[i].base_address(),
|
|
modules[i].max_executable_address(), modules[i].full_name(),
|
|
ModuleArchToString(modules[i].arch()), uuid_str);
|
|
}
|
|
Printf("End of module map.\n");
|
|
}
|
|
|
|
void CheckNoDeepBind(const char *filename, int flag) {
|
|
// Do nothing.
|
|
}
|
|
|
|
bool GetRandom(void *buffer, uptr length, bool blocking) {
|
|
if (!buffer || !length || length > 256)
|
|
return false;
|
|
// arc4random never fails.
|
|
arc4random_buf(buffer, length);
|
|
return true;
|
|
}
|
|
|
|
u32 GetNumberOfCPUs() {
|
|
return (u32)sysconf(_SC_NPROCESSORS_ONLN);
|
|
}
|
|
|
|
} // namespace __sanitizer
|
|
|
|
#endif // SANITIZER_MAC
|