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//===-- sanitizer_mac.cc --------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between various sanitizers' runtime libraries and
// implements OSX-specific functions.
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_MAC
// Use 64-bit inodes in file operations. ASan does not support OS X 10.5, so
// the clients will most certainly use 64-bit ones as well.
#ifndef _DARWIN_USE_64_BIT_INODE
#define _DARWIN_USE_64_BIT_INODE 1
#endif
#include <stdio.h>
#include "sanitizer_common.h"
#include "sanitizer_flags.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_libc.h"
#include "sanitizer_mac.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_procmaps.h"
#include <crt_externs.h> // for _NSGetEnviron
#include <fcntl.h>
#include <mach-o/dyld.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <libkern/OSAtomic.h>
#include <errno.h>
namespace __sanitizer {
#include "sanitizer_syscall_generic.inc"
// ---------------------- sanitizer_libc.h
uptr internal_mmap(void *addr, size_t length, int prot, int flags,
int fd, u64 offset) {
return (uptr)mmap(addr, length, prot, flags, fd, offset);
}
uptr internal_munmap(void *addr, uptr length) {
return munmap(addr, length);
}
uptr internal_close(fd_t fd) {
return close(fd);
}
uptr internal_open(const char *filename, int flags) {
return open(filename, flags);
}
uptr internal_open(const char *filename, int flags, u32 mode) {
return open(filename, flags, mode);
}
uptr internal_read(fd_t fd, void *buf, uptr count) {
return read(fd, buf, count);
}
uptr internal_write(fd_t fd, const void *buf, uptr count) {
return write(fd, buf, count);
}
uptr internal_stat(const char *path, void *buf) {
return stat(path, (struct stat *)buf);
}
uptr internal_lstat(const char *path, void *buf) {
return lstat(path, (struct stat *)buf);
}
uptr internal_fstat(fd_t fd, void *buf) {
return fstat(fd, (struct stat *)buf);
}
uptr internal_filesize(fd_t fd) {
struct stat st;
if (internal_fstat(fd, &st))
return -1;
return (uptr)st.st_size;
}
uptr internal_dup2(int oldfd, int newfd) {
return dup2(oldfd, newfd);
}
uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
return readlink(path, buf, bufsize);
}
uptr internal_unlink(const char *path) {
return unlink(path);
}
uptr internal_sched_yield() {
return sched_yield();
}
void internal__exit(int exitcode) {
_exit(exitcode);
}
uptr internal_getpid() {
return getpid();
}
int internal_sigaction(int signum, const void *act, void *oldact) {
return sigaction(signum,
(struct sigaction *)act, (struct sigaction *)oldact);
}
int internal_fork() {
// TODO(glider): this may call user's pthread_atfork() handlers which is bad.
return fork();
}
uptr internal_rename(const char *oldpath, const char *newpath) {
return rename(oldpath, newpath);
}
uptr internal_ftruncate(fd_t fd, uptr size) {
return ftruncate(fd, size);
}
// ----------------- sanitizer_common.h
bool FileExists(const char *filename) {
struct stat st;
if (stat(filename, &st))
return false;
// Sanity check: filename is a regular file.
return S_ISREG(st.st_mode);
}
uptr GetTid() {
return reinterpret_cast<uptr>(pthread_self());
}
void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
uptr *stack_bottom) {
CHECK(stack_top);
CHECK(stack_bottom);
uptr stacksize = pthread_get_stacksize_np(pthread_self());
// pthread_get_stacksize_np() returns an incorrect stack size for the main
// thread on Mavericks. See
// https://code.google.com/p/address-sanitizer/issues/detail?id=261
if ((GetMacosVersion() >= MACOS_VERSION_MAVERICKS) && at_initialization &&
stacksize == (1 << 19)) {
struct rlimit rl;
CHECK_EQ(getrlimit(RLIMIT_STACK, &rl), 0);
// Most often rl.rlim_cur will be the desired 8M.
if (rl.rlim_cur < kMaxThreadStackSize) {
stacksize = rl.rlim_cur;
} else {
stacksize = kMaxThreadStackSize;
}
}
void *stackaddr = pthread_get_stackaddr_np(pthread_self());
*stack_top = (uptr)stackaddr;
*stack_bottom = *stack_top - stacksize;
}
const char *GetEnv(const char *name) {
char ***env_ptr = _NSGetEnviron();
if (!env_ptr) {
Report("_NSGetEnviron() returned NULL. Please make sure __asan_init() is "
"called after libSystem_initializer().\n");
CHECK(env_ptr);
}
char **environ = *env_ptr;
CHECK(environ);
uptr name_len = internal_strlen(name);
while (*environ != 0) {
uptr len = internal_strlen(*environ);
if (len > name_len) {
const char *p = *environ;
if (!internal_memcmp(p, name, name_len) &&
p[name_len] == '=') { // Match.
return *environ + name_len + 1; // String starting after =.
}
}
environ++;
}
return 0;
}
uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
CHECK_LE(kMaxPathLength, buf_len);
// On OS X the executable path is saved to the stack by dyld. Reading it
// from there is much faster than calling dladdr, especially for large
// binaries with symbols.
InternalScopedString exe_path(kMaxPathLength);
uint32_t size = exe_path.size();
if (_NSGetExecutablePath(exe_path.data(), &size) == 0 &&
realpath(exe_path.data(), buf) != 0) {
return internal_strlen(buf);
}
return 0;
}
void ReExec() {
UNIMPLEMENTED();
}
void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
(void)args;
// Nothing here for now.
}
uptr GetPageSize() {
return sysconf(_SC_PAGESIZE);
}
BlockingMutex::BlockingMutex() {
internal_memset(this, 0, sizeof(*this));
}
void BlockingMutex::Lock() {
CHECK(sizeof(OSSpinLock) <= sizeof(opaque_storage_));
CHECK_EQ(OS_SPINLOCK_INIT, 0);
CHECK_NE(owner_, (uptr)pthread_self());
OSSpinLockLock((OSSpinLock*)&opaque_storage_);
CHECK(!owner_);
owner_ = (uptr)pthread_self();
}
void BlockingMutex::Unlock() {
CHECK(owner_ == (uptr)pthread_self());
owner_ = 0;
OSSpinLockUnlock((OSSpinLock*)&opaque_storage_);
}
void BlockingMutex::CheckLocked() {
CHECK_EQ((uptr)pthread_self(), owner_);
}
u64 NanoTime() {
return 0;
}
uptr GetTlsSize() {
return 0;
}
void InitTlsSize() {
}
void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
uptr *tls_addr, uptr *tls_size) {
#ifndef SANITIZER_GO
uptr stack_top, stack_bottom;
GetThreadStackTopAndBottom(main, &stack_top, &stack_bottom);
*stk_addr = stack_bottom;
*stk_size = stack_top - stack_bottom;
*tls_addr = 0;
*tls_size = 0;
#else
*stk_addr = 0;
*stk_size = 0;
*tls_addr = 0;
*tls_size = 0;
#endif
}
uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
string_predicate_t filter) {
MemoryMappingLayout memory_mapping(false);
return memory_mapping.DumpListOfModules(modules, max_modules, filter);
}
bool IsDeadlySignal(int signum) {
return (signum == SIGSEGV || signum == SIGBUS) && common_flags()->handle_segv;
}
MacosVersion cached_macos_version = MACOS_VERSION_UNINITIALIZED;
MacosVersion GetMacosVersionInternal() {
int mib[2] = { CTL_KERN, KERN_OSRELEASE };
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(sysctl(mib, 2, 0, &len, 0, 0), -1);
CHECK_LT(len, maxlen);
CHECK_NE(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;
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;
}
uptr GetRSS() {
return 0;
}
void *internal_start_thread(void (*func)(void *arg), void *arg) { return 0; }
void internal_join_thread(void *th) { }
void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
ucontext_t *ucontext = (ucontext_t*)context;
# if SANITIZER_WORDSIZE == 64
*pc = ucontext->uc_mcontext->__ss.__rip;
*bp = ucontext->uc_mcontext->__ss.__rbp;
*sp = ucontext->uc_mcontext->__ss.__rsp;
# else
*pc = ucontext->uc_mcontext->__ss.__eip;
*bp = ucontext->uc_mcontext->__ss.__ebp;
*sp = ucontext->uc_mcontext->__ss.__esp;
# endif // SANITIZER_WORDSIZE
}
} // namespace __sanitizer
#endif // SANITIZER_MAC