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sanitizer_linux.cc
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sanitizer_linux.cc
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//===-- sanitizer_linux.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 AddressSanitizer and ThreadSanitizer
// run-time libraries and implements linux-specific functions from
// sanitizer_libc.h.
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
SANITIZER_OPENBSD || SANITIZER_SOLARIS
#include "sanitizer_common.h"
#include "sanitizer_flags.h"
#include "sanitizer_getauxval.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_libc.h"
#include "sanitizer_linux.h"
#include "sanitizer_mutex.h"
#include "sanitizer_placement_new.h"
#include "sanitizer_procmaps.h"
#if SANITIZER_LINUX
#include <asm/param.h>
#endif
// For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat'
// format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To
// access stat from asm/stat.h, without conflicting with definition in
// sys/stat.h, we use this trick.
#if defined(__mips64)
#include <asm/unistd.h>
#include <sys/types.h>
#define stat kernel_stat
#include <asm/stat.h>
#undef stat
#endif
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <link.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <sys/mman.h>
#include <sys/param.h>
#if !SANITIZER_SOLARIS
#include <sys/ptrace.h>
#endif
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#if !SANITIZER_OPENBSD
#include <ucontext.h>
#endif
#if SANITIZER_OPENBSD
#include <sys/futex.h>
#include <sys/sysctl.h>
#endif
#include <unistd.h>
#if SANITIZER_LINUX
#include <sys/utsname.h>
#endif
#if SANITIZER_LINUX && !SANITIZER_ANDROID
#include <sys/personality.h>
#endif
#if SANITIZER_FREEBSD
#include <sys/exec.h>
#include <sys/sysctl.h>
#include <machine/atomic.h>
extern "C" {
// <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on
// FreeBSD 9.2 and 10.0.
#include <sys/umtx.h>
}
#include <sys/thr.h>
#endif // SANITIZER_FREEBSD
#if SANITIZER_NETBSD
#include <limits.h> // For NAME_MAX
#include <sys/sysctl.h>
#include <sys/exec.h>
extern struct ps_strings *__ps_strings;
#endif // SANITIZER_NETBSD
#if SANITIZER_SOLARIS
#include <stdlib.h>
#include <thread.h>
#define environ _environ
#endif
extern char **environ;
#if SANITIZER_LINUX
// <linux/time.h>
struct kernel_timeval {
long tv_sec;
long tv_usec;
};
// <linux/futex.h> is broken on some linux distributions.
const int FUTEX_WAIT = 0;
const int FUTEX_WAKE = 1;
const int FUTEX_PRIVATE_FLAG = 128;
const int FUTEX_WAIT_PRIVATE = FUTEX_WAIT | FUTEX_PRIVATE_FLAG;
const int FUTEX_WAKE_PRIVATE = FUTEX_WAKE | FUTEX_PRIVATE_FLAG;
#endif // SANITIZER_LINUX
// Are we using 32-bit or 64-bit Linux syscalls?
// x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32
// but it still needs to use 64-bit syscalls.
#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \
SANITIZER_WORDSIZE == 64)
# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1
#else
# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0
#endif
#if defined(__x86_64__) || SANITIZER_MIPS64
extern "C" {
extern void internal_sigreturn();
}
#endif
// Note : FreeBSD had implemented both
// Linux and OpenBSD apis, available from
// future 12.x version most likely
#if SANITIZER_LINUX && defined(__NR_getrandom)
# if !defined(GRND_NONBLOCK)
# define GRND_NONBLOCK 1
# endif
# define SANITIZER_USE_GETRANDOM 1
#else
# define SANITIZER_USE_GETRANDOM 0
#endif // SANITIZER_LINUX && defined(__NR_getrandom)
#if SANITIZER_OPENBSD
# define SANITIZER_USE_GETENTROPY 1
#else
# if SANITIZER_FREEBSD && __FreeBSD_version >= 1200000
# define SANITIZER_USE_GETENTROPY 1
# else
# define SANITIZER_USE_GETENTROPY 0
# endif
#endif // SANITIZER_USE_GETENTROPY
namespace __sanitizer {
#if SANITIZER_LINUX && defined(__x86_64__)
#include "sanitizer_syscall_linux_x86_64.inc"
#elif SANITIZER_LINUX && defined(__aarch64__)
#include "sanitizer_syscall_linux_aarch64.inc"
#elif SANITIZER_LINUX && defined(__arm__)
#include "sanitizer_syscall_linux_arm.inc"
#else
#include "sanitizer_syscall_generic.inc"
#endif
// --------------- sanitizer_libc.h
#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD
#if !SANITIZER_S390 && !SANITIZER_OPENBSD
uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
OFF_T offset) {
#if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd,
offset);
#else
// mmap2 specifies file offset in 4096-byte units.
CHECK(IsAligned(offset, 4096));
return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd,
offset / 4096);
#endif
}
#endif // !SANITIZER_S390 && !SANITIZER_OPENBSD
#if !SANITIZER_OPENBSD
uptr internal_munmap(void *addr, uptr length) {
return internal_syscall(SYSCALL(munmap), (uptr)addr, length);
}
int internal_mprotect(void *addr, uptr length, int prot) {
return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot);
}
#endif
uptr internal_close(fd_t fd) {
return internal_syscall(SYSCALL(close), fd);
}
uptr internal_open(const char *filename, int flags) {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags);
#else
return internal_syscall(SYSCALL(open), (uptr)filename, flags);
#endif
}
uptr internal_open(const char *filename, int flags, u32 mode) {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags,
mode);
#else
return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode);
#endif
}
uptr internal_read(fd_t fd, void *buf, uptr count) {
sptr res;
HANDLE_EINTR(res,
(sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf, count));
return res;
}
uptr internal_write(fd_t fd, const void *buf, uptr count) {
sptr res;
HANDLE_EINTR(res,
(sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf, count));
return res;
}
uptr internal_ftruncate(fd_t fd, uptr size) {
sptr res;
HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd,
(OFF_T)size));
return res;
}
#if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && SANITIZER_LINUX
static void stat64_to_stat(struct stat64 *in, struct stat *out) {
internal_memset(out, 0, sizeof(*out));
out->st_dev = in->st_dev;
out->st_ino = in->st_ino;
out->st_mode = in->st_mode;
out->st_nlink = in->st_nlink;
out->st_uid = in->st_uid;
out->st_gid = in->st_gid;
out->st_rdev = in->st_rdev;
out->st_size = in->st_size;
out->st_blksize = in->st_blksize;
out->st_blocks = in->st_blocks;
out->st_atime = in->st_atime;
out->st_mtime = in->st_mtime;
out->st_ctime = in->st_ctime;
}
#endif
#if defined(__mips64)
// Undefine compatibility macros from <sys/stat.h>
// so that they would not clash with the kernel_stat
// st_[a|m|c]time fields
#undef st_atime
#undef st_mtime
#undef st_ctime
#if defined(SANITIZER_ANDROID)
// Bionic sys/stat.h defines additional macros
// for compatibility with the old NDKs and
// they clash with the kernel_stat structure
// st_[a|m|c]time_nsec fields.
#undef st_atime_nsec
#undef st_mtime_nsec
#undef st_ctime_nsec
#endif
static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
internal_memset(out, 0, sizeof(*out));
out->st_dev = in->st_dev;
out->st_ino = in->st_ino;
out->st_mode = in->st_mode;
out->st_nlink = in->st_nlink;
out->st_uid = in->st_uid;
out->st_gid = in->st_gid;
out->st_rdev = in->st_rdev;
out->st_size = in->st_size;
out->st_blksize = in->st_blksize;
out->st_blocks = in->st_blocks;
#if defined(__USE_MISC) || \
defined(__USE_XOPEN2K8) || \
defined(SANITIZER_ANDROID)
out->st_atim.tv_sec = in->st_atime;
out->st_atim.tv_nsec = in->st_atime_nsec;
out->st_mtim.tv_sec = in->st_mtime;
out->st_mtim.tv_nsec = in->st_mtime_nsec;
out->st_ctim.tv_sec = in->st_ctime;
out->st_ctim.tv_nsec = in->st_ctime_nsec;
#else
out->st_atime = in->st_atime;
out->st_atimensec = in->st_atime_nsec;
out->st_mtime = in->st_mtime;
out->st_mtimensec = in->st_mtime_nsec;
out->st_ctime = in->st_ctime;
out->st_atimensec = in->st_ctime_nsec;
#endif
}
#endif
uptr internal_stat(const char *path, void *buf) {
#if SANITIZER_FREEBSD || SANITIZER_OPENBSD
return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf, 0);
#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf,
0);
#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
# if defined(__mips64)
// For mips64, stat syscall fills buffer in the format of kernel_stat
struct kernel_stat kbuf;
int res = internal_syscall(SYSCALL(stat), path, &kbuf);
kernel_stat_to_stat(&kbuf, (struct stat *)buf);
return res;
# else
return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf);
# endif
#else
struct stat64 buf64;
int res = internal_syscall(SYSCALL(stat64), path, &buf64);
stat64_to_stat(&buf64, (struct stat *)buf);
return res;
#endif
}
uptr internal_lstat(const char *path, void *buf) {
#if SANITIZER_FREEBSD || SANITIZER_OPENBSD
return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path, (uptr)buf,
AT_SYMLINK_NOFOLLOW);
#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path, (uptr)buf,
AT_SYMLINK_NOFOLLOW);
#elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
# if SANITIZER_MIPS64
// For mips64, lstat syscall fills buffer in the format of kernel_stat
struct kernel_stat kbuf;
int res = internal_syscall(SYSCALL(lstat), path, &kbuf);
kernel_stat_to_stat(&kbuf, (struct stat *)buf);
return res;
# else
return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf);
# endif
#else
struct stat64 buf64;
int res = internal_syscall(SYSCALL(lstat64), path, &buf64);
stat64_to_stat(&buf64, (struct stat *)buf);
return res;
#endif
}
uptr internal_fstat(fd_t fd, void *buf) {
#if SANITIZER_FREEBSD || SANITIZER_OPENBSD || \
SANITIZER_LINUX_USES_64BIT_SYSCALLS
#if SANITIZER_MIPS64 && !SANITIZER_OPENBSD
// For mips64, fstat syscall fills buffer in the format of kernel_stat
struct kernel_stat kbuf;
int res = internal_syscall(SYSCALL(fstat), fd, &kbuf);
kernel_stat_to_stat(&kbuf, (struct stat *)buf);
return res;
# else
return internal_syscall(SYSCALL(fstat), fd, (uptr)buf);
# endif
#else
struct stat64 buf64;
int res = internal_syscall(SYSCALL(fstat64), fd, &buf64);
stat64_to_stat(&buf64, (struct stat *)buf);
return res;
#endif
}
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) {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0);
#else
return internal_syscall(SYSCALL(dup2), oldfd, newfd);
#endif
}
uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf,
bufsize);
#elif SANITIZER_OPENBSD
return internal_syscall(SYSCALL(readlinkat), AT_FDCWD, (uptr)path, (uptr)buf,
bufsize);
#else
return internal_syscall(SYSCALL(readlink), path, buf, bufsize);
#endif
}
uptr internal_unlink(const char *path) {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD
return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0);
#else
return internal_syscall(SYSCALL(unlink), (uptr)path);
#endif
}
uptr internal_rename(const char *oldpath, const char *newpath) {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS || SANITIZER_OPENBSD
return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD,
(uptr)newpath);
#else
return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath);
#endif
}
uptr internal_sched_yield() {
return internal_syscall(SYSCALL(sched_yield));
}
void internal__exit(int exitcode) {
#if SANITIZER_FREEBSD || SANITIZER_OPENBSD
internal_syscall(SYSCALL(exit), exitcode);
#else
internal_syscall(SYSCALL(exit_group), exitcode);
#endif
Die(); // Unreachable.
}
unsigned int internal_sleep(unsigned int seconds) {
struct timespec ts;
ts.tv_sec = 1;
ts.tv_nsec = 0;
int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts);
if (res) return ts.tv_sec;
return 0;
}
uptr internal_execve(const char *filename, char *const argv[],
char *const envp[]) {
return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv,
(uptr)envp);
}
#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD
// ----------------- sanitizer_common.h
bool FileExists(const char *filename) {
struct stat st;
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0))
#else
if (internal_stat(filename, &st))
#endif
return false;
// Sanity check: filename is a regular file.
return S_ISREG(st.st_mode);
}
#if !SANITIZER_NETBSD
tid_t GetTid() {
#if SANITIZER_FREEBSD
long Tid;
thr_self(&Tid);
return Tid;
#elif SANITIZER_OPENBSD
return internal_syscall(SYSCALL(getthrid));
#elif SANITIZER_SOLARIS
return thr_self();
#else
return internal_syscall(SYSCALL(gettid));
#endif
}
int TgKill(pid_t pid, tid_t tid, int sig) {
#if SANITIZER_LINUX
return internal_syscall(SYSCALL(tgkill), pid, tid, sig);
#elif SANITIZER_FREEBSD
return internal_syscall(SYSCALL(thr_kill2), pid, tid, sig);
#elif SANITIZER_OPENBSD
(void)pid;
return internal_syscall(SYSCALL(thrkill), tid, sig, nullptr);
#elif SANITIZER_SOLARIS
(void)pid;
return thr_kill(tid, sig);
#endif
}
#endif
#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD
u64 NanoTime() {
#if SANITIZER_FREEBSD || SANITIZER_OPENBSD
timeval tv;
#else
kernel_timeval tv;
#endif
internal_memset(&tv, 0, sizeof(tv));
internal_syscall(SYSCALL(gettimeofday), &tv, 0);
return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
}
uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp) {
return internal_syscall(SYSCALL(clock_gettime), clk_id, tp);
}
#endif // !SANITIZER_SOLARIS && !SANITIZER_NETBSD
// Like getenv, but reads env directly from /proc (on Linux) or parses the
// 'environ' array (on some others) and does not use libc. This function
// should be called first inside __asan_init.
const char *GetEnv(const char *name) {
#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_OPENBSD || \
SANITIZER_SOLARIS
if (::environ != 0) {
uptr NameLen = internal_strlen(name);
for (char **Env = ::environ; *Env != 0; Env++) {
if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
return (*Env) + NameLen + 1;
}
}
return 0; // Not found.
#elif SANITIZER_LINUX
static char *environ;
static uptr len;
static bool inited;
if (!inited) {
inited = true;
uptr environ_size;
if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len))
environ = nullptr;
}
if (!environ || len == 0) return nullptr;
uptr namelen = internal_strlen(name);
const char *p = environ;
while (*p != '\0') { // will happen at the \0\0 that terminates the buffer
// proc file has the format NAME=value\0NAME=value\0NAME=value\0...
const char* endp =
(char*)internal_memchr(p, '\0', len - (p - environ));
if (!endp) // this entry isn't NUL terminated
return nullptr;
else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match.
return p + namelen + 1; // point after =
p = endp + 1;
}
return nullptr; // Not found.
#else
#error "Unsupported platform"
#endif
}
#if !SANITIZER_FREEBSD && !SANITIZER_NETBSD && !SANITIZER_OPENBSD
extern "C" {
SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end;
}
#endif
#if !SANITIZER_GO && !SANITIZER_FREEBSD && !SANITIZER_NETBSD && \
!SANITIZER_OPENBSD
static void ReadNullSepFileToArray(const char *path, char ***arr,
int arr_size) {
char *buff;
uptr buff_size;
uptr buff_len;
*arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray");
if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) {
(*arr)[0] = nullptr;
return;
}
(*arr)[0] = buff;
int count, i;
for (count = 1, i = 1; ; i++) {
if (buff[i] == 0) {
if (buff[i+1] == 0) break;
(*arr)[count] = &buff[i+1];
CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible.
count++;
}
}
(*arr)[count] = nullptr;
}
#endif
#if !SANITIZER_OPENBSD
static void GetArgsAndEnv(char ***argv, char ***envp) {
#if SANITIZER_FREEBSD
// On FreeBSD, retrieving the argument and environment arrays is done via the
// kern.ps_strings sysctl, which returns a pointer to a structure containing
// this information. See also <sys/exec.h>.
ps_strings *pss;
uptr sz = sizeof(pss);
if (internal_sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) {
Printf("sysctl kern.ps_strings failed\n");
Die();
}
*argv = pss->ps_argvstr;
*envp = pss->ps_envstr;
#elif SANITIZER_NETBSD
*argv = __ps_strings->ps_argvstr;
*envp = __ps_strings->ps_envstr;
#else // SANITIZER_FREEBSD
#if !SANITIZER_GO
if (&__libc_stack_end) {
#endif // !SANITIZER_GO
uptr* stack_end = (uptr*)__libc_stack_end;
int argc = *stack_end;
*argv = (char**)(stack_end + 1);
*envp = (char**)(stack_end + argc + 2);
#if !SANITIZER_GO
} else {
static const int kMaxArgv = 2000, kMaxEnvp = 2000;
ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
}
#endif // !SANITIZER_GO
#endif // SANITIZER_FREEBSD
}
char **GetArgv() {
char **argv, **envp;
GetArgsAndEnv(&argv, &envp);
return argv;
}
char **GetEnviron() {
char **argv, **envp;
GetArgsAndEnv(&argv, &envp);
return envp;
}
#endif // !SANITIZER_OPENBSD
#if !SANITIZER_SOLARIS
enum MutexState {
MtxUnlocked = 0,
MtxLocked = 1,
MtxSleeping = 2
};
BlockingMutex::BlockingMutex() {
internal_memset(this, 0, sizeof(*this));
}
void BlockingMutex::Lock() {
CHECK_EQ(owner_, 0);
atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
return;
while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
#if SANITIZER_FREEBSD
_umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0);
#elif SANITIZER_NETBSD
sched_yield(); /* No userspace futex-like synchronization */
#else
internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT_PRIVATE, MtxSleeping,
0, 0, 0);
#endif
}
}
void BlockingMutex::Unlock() {
atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release);
CHECK_NE(v, MtxUnlocked);
if (v == MtxSleeping) {
#if SANITIZER_FREEBSD
_umtx_op(m, UMTX_OP_WAKE, 1, 0, 0);
#elif SANITIZER_NETBSD
/* No userspace futex-like synchronization */
#else
internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE_PRIVATE, 1, 0, 0, 0);
#endif
}
}
void BlockingMutex::CheckLocked() {
atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed));
}
#endif // !SANITIZER_SOLARIS
// ----------------- sanitizer_linux.h
// The actual size of this structure is specified by d_reclen.
// Note that getdents64 uses a different structure format. We only provide the
// 32-bit syscall here.
#if SANITIZER_NETBSD
// Not used
#elif SANITIZER_OPENBSD
// struct dirent is different for Linux and us. At this moment, we use only
// d_fileno (Linux call this d_ino), d_reclen, and d_name.
struct linux_dirent {
u64 d_ino; // d_fileno
u16 d_reclen;
u16 d_namlen; // not used
u8 d_type; // not used
char d_name[NAME_MAX + 1];
};
#else
struct linux_dirent {
#if SANITIZER_X32 || defined(__aarch64__)
u64 d_ino;
u64 d_off;
#else
unsigned long d_ino;
unsigned long d_off;
#endif
unsigned short d_reclen;
#ifdef __aarch64__
unsigned char d_type;
#endif
char d_name[256];
};
#endif
#if !SANITIZER_SOLARIS && !SANITIZER_NETBSD
// Syscall wrappers.
uptr internal_ptrace(int request, int pid, void *addr, void *data) {
return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr,
(uptr)data);
}
uptr internal_waitpid(int pid, int *status, int options) {
return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options,
0 /* rusage */);
}
uptr internal_getpid() {
return internal_syscall(SYSCALL(getpid));
}
uptr internal_getppid() {
return internal_syscall(SYSCALL(getppid));
}
uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) {
#if SANITIZER_FREEBSD
return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL);
#elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count);
#else
return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count);
#endif
}
uptr internal_lseek(fd_t fd, OFF_T offset, int whence) {
return internal_syscall(SYSCALL(lseek), fd, offset, whence);
}
#if SANITIZER_LINUX
uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) {
return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5);
}
#endif
uptr internal_sigaltstack(const void *ss, void *oss) {
return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss);
}
int internal_fork() {
#if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
return internal_syscall(SYSCALL(clone), SIGCHLD, 0);
#else
return internal_syscall(SYSCALL(fork));
#endif
}
#if SANITIZER_FREEBSD || SANITIZER_OPENBSD
int internal_sysctl(const int *name, unsigned int namelen, void *oldp,
uptr *oldlenp, const void *newp, uptr newlen) {
#if SANITIZER_OPENBSD
return sysctl(name, namelen, oldp, (size_t *)oldlenp, (void *)newp,
(size_t)newlen);
#else
return sysctl(name, namelen, oldp, (size_t *)oldlenp, newp, (size_t)newlen);
#endif
}
#if SANITIZER_FREEBSD
int internal_sysctlbyname(const char *sname, void *oldp, uptr *oldlenp,
const void *newp, uptr newlen) {
return sysctlbyname(sname, oldp, (size_t *)oldlenp, newp, (size_t)newlen);
}
#endif
#endif
#if SANITIZER_LINUX
#define SA_RESTORER 0x04000000
// Doesn't set sa_restorer if the caller did not set it, so use with caution
//(see below).
int internal_sigaction_norestorer(int signum, const void *act, void *oldact) {
__sanitizer_kernel_sigaction_t k_act, k_oldact;
internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t));
internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t));
const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act;
__sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact;
if (u_act) {
k_act.handler = u_act->handler;
k_act.sigaction = u_act->sigaction;
internal_memcpy(&k_act.sa_mask, &u_act->sa_mask,
sizeof(__sanitizer_kernel_sigset_t));
// Without SA_RESTORER kernel ignores the calls (probably returns EINVAL).
k_act.sa_flags = u_act->sa_flags | SA_RESTORER;
// FIXME: most often sa_restorer is unset, however the kernel requires it
// to point to a valid signal restorer that calls the rt_sigreturn syscall.
// If sa_restorer passed to the kernel is NULL, the program may crash upon
// signal delivery or fail to unwind the stack in the signal handler.
// libc implementation of sigaction() passes its own restorer to
// rt_sigaction, so we need to do the same (we'll need to reimplement the
// restorers; for x86_64 the restorer address can be obtained from
// oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact).
#if !SANITIZER_ANDROID || !SANITIZER_MIPS32
k_act.sa_restorer = u_act->sa_restorer;
#endif
}
uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum,
(uptr)(u_act ? &k_act : nullptr),
(uptr)(u_oldact ? &k_oldact : nullptr),
(uptr)sizeof(__sanitizer_kernel_sigset_t));
if ((result == 0) && u_oldact) {
u_oldact->handler = k_oldact.handler;
u_oldact->sigaction = k_oldact.sigaction;
internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask,
sizeof(__sanitizer_kernel_sigset_t));
u_oldact->sa_flags = k_oldact.sa_flags;
#if !SANITIZER_ANDROID || !SANITIZER_MIPS32
u_oldact->sa_restorer = k_oldact.sa_restorer;
#endif
}
return result;
}
// Invokes sigaction via a raw syscall with a restorer, but does not support
// all platforms yet.
// We disable for Go simply because we have not yet added to buildgo.sh.
#if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
int internal_sigaction_syscall(int signum, const void *act, void *oldact) {
if (act == nullptr)
return internal_sigaction_norestorer(signum, act, oldact);
__sanitizer_sigaction u_adjust;
internal_memcpy(&u_adjust, act, sizeof(u_adjust));
#if !SANITIZER_ANDROID || !SANITIZER_MIPS32
if (u_adjust.sa_restorer == nullptr) {
u_adjust.sa_restorer = internal_sigreturn;
}
#endif
return internal_sigaction_norestorer(signum, (const void *)&u_adjust, oldact);
}
#endif // defined(__x86_64__) && !SANITIZER_GO
#endif // SANITIZER_LINUX
uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
__sanitizer_sigset_t *oldset) {
#if SANITIZER_FREEBSD || SANITIZER_OPENBSD
return internal_syscall(SYSCALL(sigprocmask), how, set, oldset);
#else
__sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
__sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset;
return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how,
(uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0],
sizeof(__sanitizer_kernel_sigset_t));
#endif
}
void internal_sigfillset(__sanitizer_sigset_t *set) {
internal_memset(set, 0xff, sizeof(*set));
}
void internal_sigemptyset(__sanitizer_sigset_t *set) {
internal_memset(set, 0, sizeof(*set));
}
#if SANITIZER_LINUX
void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
signum -= 1;
CHECK_GE(signum, 0);
CHECK_LT(signum, sizeof(*set) * 8);
__sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
k_set->sig[idx] &= ~(1 << bit);
}
bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
signum -= 1;
CHECK_GE(signum, 0);
CHECK_LT(signum, sizeof(*set) * 8);
__sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
return k_set->sig[idx] & (1 << bit);
}
#elif SANITIZER_FREEBSD
void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
sigset_t *rset = reinterpret_cast<sigset_t *>(set);
sigdelset(rset, signum);
}
bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
sigset_t *rset = reinterpret_cast<sigset_t *>(set);
return sigismember(rset, signum);
}
#endif
#endif // !SANITIZER_SOLARIS
#if !SANITIZER_NETBSD
// ThreadLister implementation.
ThreadLister::ThreadLister(pid_t pid) : pid_(pid), buffer_(4096) {
char task_directory_path[80];
internal_snprintf(task_directory_path, sizeof(task_directory_path),
"/proc/%d/task/", pid);
descriptor_ = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY);
if (internal_iserror(descriptor_)) {
Report("Can't open /proc/%d/task for reading.\n", pid);
}
}
ThreadLister::Result ThreadLister::ListThreads(
InternalMmapVector<tid_t> *threads) {
if (internal_iserror(descriptor_))
return Error;
internal_lseek(descriptor_, 0, SEEK_SET);
threads->clear();
Result result = Ok;
for (bool first_read = true;; first_read = false) {
// Resize to max capacity if it was downsized by IsAlive.
buffer_.resize(buffer_.capacity());
CHECK_GE(buffer_.size(), 4096);
uptr read = internal_getdents(
descriptor_, (struct linux_dirent *)buffer_.data(), buffer_.size());
if (!read)
return result;
if (internal_iserror(read)) {
Report("Can't read directory entries from /proc/%d/task.\n", pid_);
return Error;
}
for (uptr begin = (uptr)buffer_.data(), end = begin + read; begin < end;) {
struct linux_dirent *entry = (struct linux_dirent *)begin;
begin += entry->d_reclen;
if (entry->d_ino == 1) {
// Inode 1 is for bad blocks and also can be a reason for early return.
// Should be emitted if kernel tried to output terminating thread.
// See proc_task_readdir implementation in Linux.
result = Incomplete;
}
if (entry->d_ino && *entry->d_name >= '0' && *entry->d_name <= '9')
threads->push_back(internal_atoll(entry->d_name));
}
// Now we are going to detect short-read or early EOF. In such cases Linux
// can return inconsistent list with missing alive threads.
// Code will just remember that the list can be incomplete but it will
// continue reads to return as much as possible.
if (!first_read) {
// The first one was a short-read by definition.
result = Incomplete;
} else if (read > buffer_.size() - 1024) {
// Read was close to the buffer size. So double the size and assume the
// worst.
buffer_.resize(buffer_.size() * 2);
result = Incomplete;
} else if (!threads->empty() && !IsAlive(threads->back())) {
// Maybe Linux early returned from read on terminated thread (!pid_alive)
// and failed to restore read position.
// See next_tid and proc_task_instantiate in Linux.
result = Incomplete;
}
}
}
bool ThreadLister::IsAlive(int tid) {
// /proc/%d/task/%d/status uses same call to detect alive threads as
// proc_task_readdir. See task_state implementation in Linux.
char path[80];
internal_snprintf(path, sizeof(path), "/proc/%d/task/%d/status", pid_, tid);
if (!ReadFileToVector(path, &buffer_) || buffer_.empty())
return false;
buffer_.push_back(0);
static const char kPrefix[] = "\nPPid:";
const char *field = internal_strstr(buffer_.data(), kPrefix);
if (!field)
return false;
field += internal_strlen(kPrefix);
return (int)internal_atoll(field) != 0;
}
ThreadLister::~ThreadLister() {
if (!internal_iserror(descriptor_))
internal_close(descriptor_);
}
#endif
#if SANITIZER_WORDSIZE == 32
// Take care of unusable kernel area in top gigabyte.
static uptr GetKernelAreaSize() {
#if SANITIZER_LINUX && !SANITIZER_X32