1 //===-- sanitizer_linux.cc ------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between AddressSanitizer and ThreadSanitizer
11 // run-time libraries and implements linux-specific functions from
13 //===----------------------------------------------------------------------===//
15 #include "sanitizer_platform.h"
17 #if SANITIZER_FREEBSD || SANITIZER_LINUX
19 #include "sanitizer_common.h"
20 #include "sanitizer_flags.h"
21 #include "sanitizer_internal_defs.h"
22 #include "sanitizer_libc.h"
23 #include "sanitizer_linux.h"
24 #include "sanitizer_mutex.h"
25 #include "sanitizer_placement_new.h"
26 #include "sanitizer_procmaps.h"
27 #include "sanitizer_stacktrace.h"
28 #include "sanitizer_symbolizer.h"
30 #if !SANITIZER_FREEBSD
31 #include <asm/param.h>
34 // For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat'
35 // format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To
36 // access stat from asm/stat.h, without conflicting with definition in
37 // sys/stat.h, we use this trick.
39 #include <asm/unistd.h>
40 #include <sys/types.h>
41 #define stat kernel_stat
53 #include <sys/ptrace.h>
54 #include <sys/resource.h>
56 #include <sys/syscall.h>
58 #include <sys/types.h>
63 #include <sys/utsname.h>
66 #if SANITIZER_LINUX && !SANITIZER_ANDROID
67 #include <sys/personality.h>
72 #include <sys/sysctl.h>
73 #include <machine/atomic.h>
75 // <sys/umtx.h> must be included after <errno.h> and <sys/types.h> on
76 // FreeBSD 9.2 and 10.0.
79 extern char **environ; // provided by crt1
80 #endif // SANITIZER_FREEBSD
82 #if !SANITIZER_ANDROID
83 #include <sys/signal.h>
86 #ifndef __GLIBC_PREREQ
87 #define __GLIBC_PREREQ(x, y) 0
90 #if SANITIZER_LINUX && __GLIBC_PREREQ(2, 16)
91 # define SANITIZER_USE_GETAUXVAL 1
93 # define SANITIZER_USE_GETAUXVAL 0
96 #if SANITIZER_USE_GETAUXVAL
102 struct kernel_timeval {
107 // <linux/futex.h> is broken on some linux distributions.
108 const int FUTEX_WAIT = 0;
109 const int FUTEX_WAKE = 1;
110 #endif // SANITIZER_LINUX
112 // Are we using 32-bit or 64-bit Linux syscalls?
113 // x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32
114 // but it still needs to use 64-bit syscalls.
115 #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__powerpc64__) || \
116 SANITIZER_WORDSIZE == 64)
117 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1
119 # define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0
122 #if defined(__x86_64__) || SANITIZER_MIPS64
124 extern void internal_sigreturn();
128 namespace __sanitizer {
130 #if SANITIZER_LINUX && defined(__x86_64__)
131 #include "sanitizer_syscall_linux_x86_64.inc"
132 #elif SANITIZER_LINUX && defined(__aarch64__)
133 #include "sanitizer_syscall_linux_aarch64.inc"
135 #include "sanitizer_syscall_generic.inc"
138 // --------------- sanitizer_libc.h
140 uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
142 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
143 return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd,
146 // mmap2 specifies file offset in 4096-byte units.
147 CHECK(IsAligned(offset, 4096));
148 return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd,
152 #endif // !SANITIZER_S390
154 uptr internal_munmap(void *addr, uptr length) {
155 return internal_syscall(SYSCALL(munmap), (uptr)addr, length);
158 int internal_mprotect(void *addr, uptr length, int prot) {
159 return internal_syscall(SYSCALL(mprotect), (uptr)addr, length, prot);
162 uptr internal_close(fd_t fd) {
163 return internal_syscall(SYSCALL(close), fd);
166 uptr internal_open(const char *filename, int flags) {
167 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
168 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags);
170 return internal_syscall(SYSCALL(open), (uptr)filename, flags);
174 uptr internal_open(const char *filename, int flags, u32 mode) {
175 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
176 return internal_syscall(SYSCALL(openat), AT_FDCWD, (uptr)filename, flags,
179 return internal_syscall(SYSCALL(open), (uptr)filename, flags, mode);
183 uptr internal_read(fd_t fd, void *buf, uptr count) {
185 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(read), fd, (uptr)buf,
190 uptr internal_write(fd_t fd, const void *buf, uptr count) {
192 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(write), fd, (uptr)buf,
197 uptr internal_ftruncate(fd_t fd, uptr size) {
199 HANDLE_EINTR(res, (sptr)internal_syscall(SYSCALL(ftruncate), fd,
204 #if !SANITIZER_LINUX_USES_64BIT_SYSCALLS && !SANITIZER_FREEBSD
205 static void stat64_to_stat(struct stat64 *in, struct stat *out) {
206 internal_memset(out, 0, sizeof(*out));
207 out->st_dev = in->st_dev;
208 out->st_ino = in->st_ino;
209 out->st_mode = in->st_mode;
210 out->st_nlink = in->st_nlink;
211 out->st_uid = in->st_uid;
212 out->st_gid = in->st_gid;
213 out->st_rdev = in->st_rdev;
214 out->st_size = in->st_size;
215 out->st_blksize = in->st_blksize;
216 out->st_blocks = in->st_blocks;
217 out->st_atime = in->st_atime;
218 out->st_mtime = in->st_mtime;
219 out->st_ctime = in->st_ctime;
223 #if defined(__mips64)
224 static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
225 internal_memset(out, 0, sizeof(*out));
226 out->st_dev = in->st_dev;
227 out->st_ino = in->st_ino;
228 out->st_mode = in->st_mode;
229 out->st_nlink = in->st_nlink;
230 out->st_uid = in->st_uid;
231 out->st_gid = in->st_gid;
232 out->st_rdev = in->st_rdev;
233 out->st_size = in->st_size;
234 out->st_blksize = in->st_blksize;
235 out->st_blocks = in->st_blocks;
236 out->st_atime = in->st_atime_nsec;
237 out->st_mtime = in->st_mtime_nsec;
238 out->st_ctime = in->st_ctime_nsec;
242 uptr internal_stat(const char *path, void *buf) {
243 #if SANITIZER_FREEBSD
244 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path,
246 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
247 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
249 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
250 # if defined(__mips64)
251 // For mips64, stat syscall fills buffer in the format of kernel_stat
252 struct kernel_stat kbuf;
253 int res = internal_syscall(SYSCALL(stat), path, &kbuf);
254 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
257 return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf);
261 int res = internal_syscall(SYSCALL(stat64), path, &buf64);
262 stat64_to_stat(&buf64, (struct stat *)buf);
267 uptr internal_lstat(const char *path, void *buf) {
268 #if SANITIZER_FREEBSD
269 return internal_syscall(SYSCALL(fstatat), AT_FDCWD, (uptr)path,
270 (uptr)buf, AT_SYMLINK_NOFOLLOW);
271 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
272 return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
273 (uptr)buf, AT_SYMLINK_NOFOLLOW);
274 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
275 # if SANITIZER_MIPS64
276 // For mips64, lstat syscall fills buffer in the format of kernel_stat
277 struct kernel_stat kbuf;
278 int res = internal_syscall(SYSCALL(lstat), path, &kbuf);
279 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
282 return internal_syscall(SYSCALL(lstat), (uptr)path, (uptr)buf);
286 int res = internal_syscall(SYSCALL(lstat64), path, &buf64);
287 stat64_to_stat(&buf64, (struct stat *)buf);
292 uptr internal_fstat(fd_t fd, void *buf) {
293 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
294 # if SANITIZER_MIPS64
295 // For mips64, fstat syscall fills buffer in the format of kernel_stat
296 struct kernel_stat kbuf;
297 int res = internal_syscall(SYSCALL(fstat), fd, &kbuf);
298 kernel_stat_to_stat(&kbuf, (struct stat *)buf);
301 return internal_syscall(SYSCALL(fstat), fd, (uptr)buf);
305 int res = internal_syscall(SYSCALL(fstat64), fd, &buf64);
306 stat64_to_stat(&buf64, (struct stat *)buf);
311 uptr internal_filesize(fd_t fd) {
313 if (internal_fstat(fd, &st))
315 return (uptr)st.st_size;
318 uptr internal_dup2(int oldfd, int newfd) {
319 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
320 return internal_syscall(SYSCALL(dup3), oldfd, newfd, 0);
322 return internal_syscall(SYSCALL(dup2), oldfd, newfd);
326 uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
327 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
328 return internal_syscall(SYSCALL(readlinkat), AT_FDCWD,
329 (uptr)path, (uptr)buf, bufsize);
331 return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize);
335 uptr internal_unlink(const char *path) {
336 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
337 return internal_syscall(SYSCALL(unlinkat), AT_FDCWD, (uptr)path, 0);
339 return internal_syscall(SYSCALL(unlink), (uptr)path);
343 uptr internal_rename(const char *oldpath, const char *newpath) {
344 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
345 return internal_syscall(SYSCALL(renameat), AT_FDCWD, (uptr)oldpath, AT_FDCWD,
348 return internal_syscall(SYSCALL(rename), (uptr)oldpath, (uptr)newpath);
352 uptr internal_sched_yield() {
353 return internal_syscall(SYSCALL(sched_yield));
356 void internal__exit(int exitcode) {
357 #if SANITIZER_FREEBSD
358 internal_syscall(SYSCALL(exit), exitcode);
360 internal_syscall(SYSCALL(exit_group), exitcode);
362 Die(); // Unreachable.
365 unsigned int internal_sleep(unsigned int seconds) {
369 int res = internal_syscall(SYSCALL(nanosleep), &ts, &ts);
370 if (res) return ts.tv_sec;
374 uptr internal_execve(const char *filename, char *const argv[],
375 char *const envp[]) {
376 return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv,
380 // ----------------- sanitizer_common.h
381 bool FileExists(const char *filename) {
383 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
384 if (internal_syscall(SYSCALL(newfstatat), AT_FDCWD, filename, &st, 0))
386 if (internal_stat(filename, &st))
389 // Sanity check: filename is a regular file.
390 return S_ISREG(st.st_mode);
394 #if SANITIZER_FREEBSD
395 return (uptr)pthread_self();
397 return internal_syscall(SYSCALL(gettid));
402 #if SANITIZER_FREEBSD
407 internal_memset(&tv, 0, sizeof(tv));
408 internal_syscall(SYSCALL(gettimeofday), (uptr)&tv, 0);
409 return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000;
412 // Like getenv, but reads env directly from /proc (on Linux) or parses the
413 // 'environ' array (on FreeBSD) and does not use libc. This function should be
414 // called first inside __asan_init.
415 const char *GetEnv(const char *name) {
416 #if SANITIZER_FREEBSD
417 if (::environ != 0) {
418 uptr NameLen = internal_strlen(name);
419 for (char **Env = ::environ; *Env != 0; Env++) {
420 if (internal_strncmp(*Env, name, NameLen) == 0 && (*Env)[NameLen] == '=')
421 return (*Env) + NameLen + 1;
424 return 0; // Not found.
425 #elif SANITIZER_LINUX
426 static char *environ;
432 if (!ReadFileToBuffer("/proc/self/environ", &environ, &environ_size, &len))
435 if (!environ || len == 0) return nullptr;
436 uptr namelen = internal_strlen(name);
437 const char *p = environ;
438 while (*p != '\0') { // will happen at the \0\0 that terminates the buffer
439 // proc file has the format NAME=value\0NAME=value\0NAME=value\0...
441 (char*)internal_memchr(p, '\0', len - (p - environ));
442 if (!endp) // this entry isn't NUL terminated
444 else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match.
445 return p + namelen + 1; // point after =
448 return nullptr; // Not found.
450 #error "Unsupported platform"
454 #if !SANITIZER_FREEBSD
456 SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end;
460 #if !SANITIZER_GO && !SANITIZER_FREEBSD
461 static void ReadNullSepFileToArray(const char *path, char ***arr,
466 *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray");
467 if (!ReadFileToBuffer(path, &buff, &buff_size, &buff_len, 1024 * 1024)) {
473 for (count = 1, i = 1; ; i++) {
475 if (buff[i+1] == 0) break;
476 (*arr)[count] = &buff[i+1];
477 CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible.
481 (*arr)[count] = nullptr;
485 static void GetArgsAndEnv(char ***argv, char ***envp) {
486 #if !SANITIZER_FREEBSD
488 if (&__libc_stack_end) {
490 uptr* stack_end = (uptr*)__libc_stack_end;
491 int argc = *stack_end;
492 *argv = (char**)(stack_end + 1);
493 *envp = (char**)(stack_end + argc + 2);
496 static const int kMaxArgv = 2000, kMaxEnvp = 2000;
497 ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
498 ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
502 // On FreeBSD, retrieving the argument and environment arrays is done via the
503 // kern.ps_strings sysctl, which returns a pointer to a structure containing
504 // this information. See also <sys/exec.h>.
506 size_t sz = sizeof(pss);
507 if (sysctlbyname("kern.ps_strings", &pss, &sz, NULL, 0) == -1) {
508 Printf("sysctl kern.ps_strings failed\n");
511 *argv = pss->ps_argvstr;
512 *envp = pss->ps_envstr;
518 GetArgsAndEnv(&argv, &envp);
524 GetArgsAndEnv(&argv, &envp);
525 uptr rv = internal_execve("/proc/self/exe", argv, envp);
527 CHECK_EQ(internal_iserror(rv, &rverrno), true);
528 Printf("execve failed, errno %d\n", rverrno);
538 BlockingMutex::BlockingMutex() {
539 internal_memset(this, 0, sizeof(*this));
542 void BlockingMutex::Lock() {
544 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
545 if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
547 while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) {
548 #if SANITIZER_FREEBSD
549 _umtx_op(m, UMTX_OP_WAIT_UINT, MtxSleeping, 0, 0);
551 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT, MtxSleeping, 0, 0, 0);
556 void BlockingMutex::Unlock() {
557 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
558 u32 v = atomic_exchange(m, MtxUnlocked, memory_order_release);
559 CHECK_NE(v, MtxUnlocked);
560 if (v == MtxSleeping) {
561 #if SANITIZER_FREEBSD
562 _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0);
564 internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE, 1, 0, 0, 0);
569 void BlockingMutex::CheckLocked() {
570 atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
571 CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed));
574 // ----------------- sanitizer_linux.h
575 // The actual size of this structure is specified by d_reclen.
576 // Note that getdents64 uses a different structure format. We only provide the
577 // 32-bit syscall here.
578 struct linux_dirent {
579 #if SANITIZER_X32 || defined(__aarch64__)
586 unsigned short d_reclen;
588 unsigned char d_type;
594 uptr internal_ptrace(int request, int pid, void *addr, void *data) {
595 return internal_syscall(SYSCALL(ptrace), request, pid, (uptr)addr,
599 uptr internal_waitpid(int pid, int *status, int options) {
600 return internal_syscall(SYSCALL(wait4), pid, (uptr)status, options,
604 uptr internal_getpid() {
605 return internal_syscall(SYSCALL(getpid));
608 uptr internal_getppid() {
609 return internal_syscall(SYSCALL(getppid));
612 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) {
613 #if SANITIZER_FREEBSD
614 return internal_syscall(SYSCALL(getdirentries), fd, (uptr)dirp, count, NULL);
615 #elif SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
616 return internal_syscall(SYSCALL(getdents64), fd, (uptr)dirp, count);
618 return internal_syscall(SYSCALL(getdents), fd, (uptr)dirp, count);
622 uptr internal_lseek(fd_t fd, OFF_T offset, int whence) {
623 return internal_syscall(SYSCALL(lseek), fd, offset, whence);
627 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) {
628 return internal_syscall(SYSCALL(prctl), option, arg2, arg3, arg4, arg5);
632 uptr internal_sigaltstack(const void *ss, void *oss) {
633 return internal_syscall(SYSCALL(sigaltstack), (uptr)ss, (uptr)oss);
636 int internal_fork() {
637 #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS
638 return internal_syscall(SYSCALL(clone), SIGCHLD, 0);
640 return internal_syscall(SYSCALL(fork));
645 #define SA_RESTORER 0x04000000
646 // Doesn't set sa_restorer if the caller did not set it, so use with caution
648 int internal_sigaction_norestorer(int signum, const void *act, void *oldact) {
649 __sanitizer_kernel_sigaction_t k_act, k_oldact;
650 internal_memset(&k_act, 0, sizeof(__sanitizer_kernel_sigaction_t));
651 internal_memset(&k_oldact, 0, sizeof(__sanitizer_kernel_sigaction_t));
652 const __sanitizer_sigaction *u_act = (const __sanitizer_sigaction *)act;
653 __sanitizer_sigaction *u_oldact = (__sanitizer_sigaction *)oldact;
655 k_act.handler = u_act->handler;
656 k_act.sigaction = u_act->sigaction;
657 internal_memcpy(&k_act.sa_mask, &u_act->sa_mask,
658 sizeof(__sanitizer_kernel_sigset_t));
659 // Without SA_RESTORER kernel ignores the calls (probably returns EINVAL).
660 k_act.sa_flags = u_act->sa_flags | SA_RESTORER;
661 // FIXME: most often sa_restorer is unset, however the kernel requires it
662 // to point to a valid signal restorer that calls the rt_sigreturn syscall.
663 // If sa_restorer passed to the kernel is NULL, the program may crash upon
664 // signal delivery or fail to unwind the stack in the signal handler.
665 // libc implementation of sigaction() passes its own restorer to
666 // rt_sigaction, so we need to do the same (we'll need to reimplement the
667 // restorers; for x86_64 the restorer address can be obtained from
668 // oldact->sa_restorer upon a call to sigaction(xxx, NULL, oldact).
669 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
670 k_act.sa_restorer = u_act->sa_restorer;
674 uptr result = internal_syscall(SYSCALL(rt_sigaction), (uptr)signum,
675 (uptr)(u_act ? &k_act : nullptr),
676 (uptr)(u_oldact ? &k_oldact : nullptr),
677 (uptr)sizeof(__sanitizer_kernel_sigset_t));
679 if ((result == 0) && u_oldact) {
680 u_oldact->handler = k_oldact.handler;
681 u_oldact->sigaction = k_oldact.sigaction;
682 internal_memcpy(&u_oldact->sa_mask, &k_oldact.sa_mask,
683 sizeof(__sanitizer_kernel_sigset_t));
684 u_oldact->sa_flags = k_oldact.sa_flags;
685 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
686 u_oldact->sa_restorer = k_oldact.sa_restorer;
692 // Invokes sigaction via a raw syscall with a restorer, but does not support
693 // all platforms yet.
694 // We disable for Go simply because we have not yet added to buildgo.sh.
695 #if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO
696 int internal_sigaction_syscall(int signum, const void *act, void *oldact) {
698 return internal_sigaction_norestorer(signum, act, oldact);
699 __sanitizer_sigaction u_adjust;
700 internal_memcpy(&u_adjust, act, sizeof(u_adjust));
701 #if !SANITIZER_ANDROID || !SANITIZER_MIPS32
702 if (u_adjust.sa_restorer == nullptr) {
703 u_adjust.sa_restorer = internal_sigreturn;
706 return internal_sigaction_norestorer(signum, (const void *)&u_adjust,
709 #endif // defined(__x86_64__) && !SANITIZER_GO
710 #endif // SANITIZER_LINUX
712 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
713 __sanitizer_sigset_t *oldset) {
714 #if SANITIZER_FREEBSD
715 return internal_syscall(SYSCALL(sigprocmask), how, set, oldset);
717 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
718 __sanitizer_kernel_sigset_t *k_oldset = (__sanitizer_kernel_sigset_t *)oldset;
719 return internal_syscall(SYSCALL(rt_sigprocmask), (uptr)how,
720 (uptr)&k_set->sig[0], (uptr)&k_oldset->sig[0],
721 sizeof(__sanitizer_kernel_sigset_t));
725 void internal_sigfillset(__sanitizer_sigset_t *set) {
726 internal_memset(set, 0xff, sizeof(*set));
729 void internal_sigemptyset(__sanitizer_sigset_t *set) {
730 internal_memset(set, 0, sizeof(*set));
734 void internal_sigdelset(__sanitizer_sigset_t *set, int signum) {
737 CHECK_LT(signum, sizeof(*set) * 8);
738 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
739 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
740 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
741 k_set->sig[idx] &= ~(1 << bit);
744 bool internal_sigismember(__sanitizer_sigset_t *set, int signum) {
747 CHECK_LT(signum, sizeof(*set) * 8);
748 __sanitizer_kernel_sigset_t *k_set = (__sanitizer_kernel_sigset_t *)set;
749 const uptr idx = signum / (sizeof(k_set->sig[0]) * 8);
750 const uptr bit = signum % (sizeof(k_set->sig[0]) * 8);
751 return k_set->sig[idx] & (1 << bit);
753 #endif // SANITIZER_LINUX
755 // ThreadLister implementation.
756 ThreadLister::ThreadLister(int pid)
761 entry_((struct linux_dirent *)buffer_.data()),
763 char task_directory_path[80];
764 internal_snprintf(task_directory_path, sizeof(task_directory_path),
765 "/proc/%d/task/", pid);
766 uptr openrv = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY);
767 if (internal_iserror(openrv)) {
769 Report("Can't open /proc/%d/task for reading.\n", pid);
772 descriptor_ = openrv;
776 int ThreadLister::GetNextTID() {
781 if ((char *)entry_ >= &buffer_[bytes_read_] && !GetDirectoryEntries())
783 if (entry_->d_ino != 0 && entry_->d_name[0] >= '0' &&
784 entry_->d_name[0] <= '9') {
785 // Found a valid tid.
786 tid = (int)internal_atoll(entry_->d_name);
788 entry_ = (struct linux_dirent *)(((char *)entry_) + entry_->d_reclen);
793 void ThreadLister::Reset() {
794 if (error_ || descriptor_ < 0)
796 internal_lseek(descriptor_, 0, SEEK_SET);
799 ThreadLister::~ThreadLister() {
800 if (descriptor_ >= 0)
801 internal_close(descriptor_);
804 bool ThreadLister::error() { return error_; }
806 bool ThreadLister::GetDirectoryEntries() {
807 CHECK_GE(descriptor_, 0);
808 CHECK_NE(error_, true);
809 bytes_read_ = internal_getdents(descriptor_,
810 (struct linux_dirent *)buffer_.data(),
812 if (internal_iserror(bytes_read_)) {
813 Report("Can't read directory entries from /proc/%d/task.\n", pid_);
816 } else if (bytes_read_ == 0) {
819 entry_ = (struct linux_dirent *)buffer_.data();
823 #if SANITIZER_WORDSIZE == 32
824 // Take care of unusable kernel area in top gigabyte.
825 static uptr GetKernelAreaSize() {
826 #if SANITIZER_LINUX && !SANITIZER_X32
827 const uptr gbyte = 1UL << 30;
829 // Firstly check if there are writable segments
830 // mapped to top gigabyte (e.g. stack).
831 MemoryMappingLayout proc_maps(/*cache_enabled*/true);
832 MemoryMappedSegment segment;
833 while (proc_maps.Next(&segment)) {
834 if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0;
837 #if !SANITIZER_ANDROID
838 // Even if nothing is mapped, top Gb may still be accessible
839 // if we are running on 64-bit kernel.
840 // Uname may report misleading results if personality type
841 // is modified (e.g. under schroot) so check this as well.
842 struct utsname uname_info;
843 int pers = personality(0xffffffffUL);
844 if (!(pers & PER_MASK)
845 && uname(&uname_info) == 0
846 && internal_strstr(uname_info.machine, "64"))
848 #endif // SANITIZER_ANDROID
850 // Top gigabyte is reserved for kernel.
854 #endif // SANITIZER_LINUX && !SANITIZER_X32
856 #endif // SANITIZER_WORDSIZE == 32
858 uptr GetMaxVirtualAddress() {
859 #if SANITIZER_WORDSIZE == 64
860 # if defined(__powerpc64__) || defined(__aarch64__)
861 // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
862 // We somehow need to figure out which one we are using now and choose
863 // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
864 // Note that with 'ulimit -s unlimited' the stack is moved away from the top
865 // of the address space, so simply checking the stack address is not enough.
866 // This should (does) work for both PowerPC64 Endian modes.
867 // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
868 return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
869 # elif defined(__mips64)
870 return (1ULL << 40) - 1; // 0x000000ffffffffffUL;
871 # elif defined(__s390x__)
872 return (1ULL << 53) - 1; // 0x001fffffffffffffUL;
874 return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
876 #else // SANITIZER_WORDSIZE == 32
877 # if defined(__s390__)
878 return (1ULL << 31) - 1; // 0x7fffffff;
880 uptr res = (1ULL << 32) - 1; // 0xffffffff;
881 if (!common_flags()->full_address_space)
882 res -= GetKernelAreaSize();
883 CHECK_LT(reinterpret_cast<uptr>(&res), res);
886 #endif // SANITIZER_WORDSIZE
890 // Android post-M sysconf(_SC_PAGESIZE) crashes if called from .preinit_array.
891 #if SANITIZER_ANDROID
893 #elif SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__))
894 return EXEC_PAGESIZE;
895 #elif SANITIZER_USE_GETAUXVAL
896 return getauxval(AT_PAGESZ);
898 return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy.
902 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
903 #if SANITIZER_FREEBSD
904 const int Mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
905 const char *default_module_name = "kern.proc.pathname";
906 size_t Size = buf_len;
907 bool IsErr = (sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0);
908 int readlink_error = IsErr ? errno : 0;
909 uptr module_name_len = Size;
911 const char *default_module_name = "/proc/self/exe";
912 uptr module_name_len = internal_readlink(
913 default_module_name, buf, buf_len);
915 bool IsErr = internal_iserror(module_name_len, &readlink_error);
918 // We can't read binary name for some reason, assume it's unknown.
919 Report("WARNING: reading executable name failed with errno %d, "
920 "some stack frames may not be symbolized\n", readlink_error);
921 module_name_len = internal_snprintf(buf, buf_len, "%s",
922 default_module_name);
923 CHECK_LT(module_name_len, buf_len);
925 return module_name_len;
928 uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) {
933 if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen,
935 internal_strncpy(buf, tmpbuf, buf_len);
936 UnmapOrDie(tmpbuf, tmpsize);
937 return internal_strlen(buf);
940 return ReadBinaryName(buf, buf_len);
943 // Match full names of the form /path/to/base_name{-,.}*
944 bool LibraryNameIs(const char *full_name, const char *base_name) {
945 const char *name = full_name;
947 while (*name != '\0') name++;
948 while (name > full_name && *name != '/') name--;
949 if (*name == '/') name++;
950 uptr base_name_length = internal_strlen(base_name);
951 if (internal_strncmp(name, base_name, base_name_length)) return false;
952 return (name[base_name_length] == '-' || name[base_name_length] == '.');
955 #if !SANITIZER_ANDROID
956 // Call cb for each region mapped by map.
957 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) {
958 CHECK_NE(map, nullptr);
959 #if !SANITIZER_FREEBSD
960 typedef ElfW(Phdr) Elf_Phdr;
961 typedef ElfW(Ehdr) Elf_Ehdr;
962 #endif // !SANITIZER_FREEBSD
963 char *base = (char *)map->l_addr;
964 Elf_Ehdr *ehdr = (Elf_Ehdr *)base;
965 char *phdrs = base + ehdr->e_phoff;
966 char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize;
968 // Find the segment with the minimum base so we can "relocate" the p_vaddr
969 // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC
970 // objects have a non-zero base.
971 uptr preferred_base = (uptr)-1;
972 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
973 Elf_Phdr *phdr = (Elf_Phdr *)iter;
974 if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr)
975 preferred_base = (uptr)phdr->p_vaddr;
978 // Compute the delta from the real base to get a relocation delta.
979 sptr delta = (uptr)base - preferred_base;
980 // Now we can figure out what the loader really mapped.
981 for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) {
982 Elf_Phdr *phdr = (Elf_Phdr *)iter;
983 if (phdr->p_type == PT_LOAD) {
984 uptr seg_start = phdr->p_vaddr + delta;
985 uptr seg_end = seg_start + phdr->p_memsz;
986 // None of these values are aligned. We consider the ragged edges of the
987 // load command as defined, since they are mapped from the file.
988 seg_start = RoundDownTo(seg_start, GetPageSizeCached());
989 seg_end = RoundUpTo(seg_end, GetPageSizeCached());
990 cb((void *)seg_start, seg_end - seg_start);
996 #if defined(__x86_64__) && SANITIZER_LINUX
997 // We cannot use glibc's clone wrapper, because it messes with the child
998 // task's TLS. It writes the PID and TID of the child task to its thread
999 // descriptor, but in our case the child task shares the thread descriptor with
1000 // the parent (because we don't know how to allocate a new thread
1001 // descriptor to keep glibc happy). So the stock version of clone(), when
1002 // used with CLONE_VM, would end up corrupting the parent's thread descriptor.
1003 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1004 int *parent_tidptr, void *newtls, int *child_tidptr) {
1006 if (!fn || !child_stack)
1008 CHECK_EQ(0, (uptr)child_stack % 16);
1009 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1010 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1011 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1012 register void *r8 __asm__("r8") = newtls;
1013 register int *r10 __asm__("r10") = child_tidptr;
1014 __asm__ __volatile__(
1015 /* %rax = syscall(%rax = SYSCALL(clone),
1017 * %rsi = child_stack,
1018 * %rdx = parent_tidptr,
1020 * %r10 = child_tidptr)
1027 "testq %%rax,%%rax\n"
1030 /* In the child. Terminate unwind chain. */
1031 // XXX: We should also terminate the CFI unwind chain
1032 // here. Unfortunately clang 3.2 doesn't support the
1033 // necessary CFI directives, so we skip that part.
1034 "xorq %%rbp,%%rbp\n"
1036 /* Call "fn(arg)". */
1041 /* Call _exit(%rax). */
1042 "movq %%rax,%%rdi\n"
1046 /* Return to parent. */
1049 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
1055 : "rsp", "memory", "r11", "rcx");
1058 #elif defined(__mips__)
1059 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1060 int *parent_tidptr, void *newtls, int *child_tidptr) {
1062 if (!fn || !child_stack)
1064 CHECK_EQ(0, (uptr)child_stack % 16);
1065 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1066 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1067 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1068 register void *a3 __asm__("$7") = newtls;
1069 register int *a4 __asm__("$8") = child_tidptr;
1070 // We don't have proper CFI directives here because it requires alot of code
1071 // for very marginal benefits.
1072 __asm__ __volatile__(
1073 /* $v0 = syscall($v0 = __NR_clone,
1075 * $a1 = child_stack,
1076 * $a2 = parent_tidptr,
1078 * $a4 = child_tidptr)
1085 /* Store the fifth argument on stack
1086 * if we are using 32-bit abi.
1088 #if SANITIZER_WORDSIZE == 32
1101 /* Call "fn(arg)". */
1102 #if SANITIZER_WORDSIZE == 32
1103 #ifdef __BIG_ENDIAN__
1116 /* Call _exit($v0). */
1121 /* Return to parent. */
1131 : "memory", "$29" );
1134 #elif defined(__aarch64__)
1135 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1136 int *parent_tidptr, void *newtls, int *child_tidptr) {
1138 if (!fn || !child_stack)
1140 CHECK_EQ(0, (uptr)child_stack % 16);
1141 child_stack = (char *)child_stack - 2 * sizeof(unsigned long long);
1142 ((unsigned long long *)child_stack)[0] = (uptr)fn;
1143 ((unsigned long long *)child_stack)[1] = (uptr)arg;
1145 register int (*__fn)(void *) __asm__("x0") = fn;
1146 register void *__stack __asm__("x1") = child_stack;
1147 register int __flags __asm__("x2") = flags;
1148 register void *__arg __asm__("x3") = arg;
1149 register int *__ptid __asm__("x4") = parent_tidptr;
1150 register void *__tls __asm__("x5") = newtls;
1151 register int *__ctid __asm__("x6") = child_tidptr;
1153 __asm__ __volatile__(
1154 "mov x0,x2\n" /* flags */
1155 "mov x2,x4\n" /* ptid */
1156 "mov x3,x5\n" /* tls */
1157 "mov x4,x6\n" /* ctid */
1158 "mov x8,%9\n" /* clone */
1168 /* In the child, now. Call "fn(arg)". */
1169 "ldp x1, x0, [sp], #16\n"
1172 /* Call _exit(%r0). */
1179 "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg),
1180 "r"(__ptid), "r"(__tls), "r"(__ctid),
1181 "i"(__NR_clone), "i"(__NR_exit)
1185 #elif defined(__powerpc64__)
1186 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1187 int *parent_tidptr, void *newtls, int *child_tidptr) {
1189 // Stack frame structure.
1190 #if SANITIZER_PPC64V1
1191 // Back chain == 0 (SP + 112)
1192 // Frame (112 bytes):
1193 // Parameter save area (SP + 48), 8 doublewords
1194 // TOC save area (SP + 40)
1195 // Link editor doubleword (SP + 32)
1196 // Compiler doubleword (SP + 24)
1197 // LR save area (SP + 16)
1198 // CR save area (SP + 8)
1199 // Back chain (SP + 0)
1200 # define FRAME_SIZE 112
1201 # define FRAME_TOC_SAVE_OFFSET 40
1202 #elif SANITIZER_PPC64V2
1203 // Back chain == 0 (SP + 32)
1204 // Frame (32 bytes):
1205 // TOC save area (SP + 24)
1206 // LR save area (SP + 16)
1207 // CR save area (SP + 8)
1208 // Back chain (SP + 0)
1209 # define FRAME_SIZE 32
1210 # define FRAME_TOC_SAVE_OFFSET 24
1212 # error "Unsupported PPC64 ABI"
1214 if (!fn || !child_stack)
1216 CHECK_EQ(0, (uptr)child_stack % 16);
1218 register int (*__fn)(void *) __asm__("r3") = fn;
1219 register void *__cstack __asm__("r4") = child_stack;
1220 register int __flags __asm__("r5") = flags;
1221 register void *__arg __asm__("r6") = arg;
1222 register int *__ptidptr __asm__("r7") = parent_tidptr;
1223 register void *__newtls __asm__("r8") = newtls;
1224 register int *__ctidptr __asm__("r9") = child_tidptr;
1226 __asm__ __volatile__(
1227 /* fn and arg are saved across the syscall */
1237 r7 == child_tidptr */
1245 /* Test if syscall was successful */
1246 "cmpdi cr1, 3, 0\n\t"
1247 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
1250 /* Set up stack frame */
1252 "stdu 29, -8(1)\n\t"
1253 "stdu 1, -%12(1)\n\t"
1254 /* Do the function call */
1256 #if SANITIZER_PPC64V1
1260 #elif SANITIZER_PPC64V2
1264 # error "Unsupported PPC64 ABI"
1270 /* Call _exit(r3) */
1274 /* Return to parent */
1290 "i" (FRAME_TOC_SAVE_OFFSET)
1291 : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
1294 #elif defined(__i386__) && SANITIZER_LINUX
1295 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1296 int *parent_tidptr, void *newtls, int *child_tidptr) {
1298 if (!fn || !child_stack)
1300 CHECK_EQ(0, (uptr)child_stack % 16);
1301 child_stack = (char *)child_stack - 7 * sizeof(unsigned int);
1302 ((unsigned int *)child_stack)[0] = (uptr)flags;
1303 ((unsigned int *)child_stack)[1] = (uptr)0;
1304 ((unsigned int *)child_stack)[2] = (uptr)fn;
1305 ((unsigned int *)child_stack)[3] = (uptr)arg;
1306 __asm__ __volatile__(
1307 /* %eax = syscall(%eax = SYSCALL(clone),
1309 * %ecx = child_stack,
1310 * %edx = parent_tidptr,
1312 * %edi = child_tidptr)
1316 "movl (%%ecx), %%ebx\n"
1317 /* Do the system call */
1321 /* Remember the flag value. */
1322 "movl %%ebx, (%%ecx)\n"
1332 "test %%eax,%%eax\n"
1335 /* terminate the stack frame */
1336 "xorl %%ebp,%%ebp\n"
1343 "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n"
1346 "movl %%eax, %%ebx\n"
1351 : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
1359 #elif defined(__arm__) && SANITIZER_LINUX
1360 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
1361 int *parent_tidptr, void *newtls, int *child_tidptr) {
1363 if (!fn || !child_stack)
1365 child_stack = (char *)child_stack - 2 * sizeof(unsigned int);
1366 ((unsigned int *)child_stack)[0] = (uptr)fn;
1367 ((unsigned int *)child_stack)[1] = (uptr)arg;
1368 register int r0 __asm__("r0") = flags;
1369 register void *r1 __asm__("r1") = child_stack;
1370 register int *r2 __asm__("r2") = parent_tidptr;
1371 register void *r3 __asm__("r3") = newtls;
1372 register int *r4 __asm__("r4") = child_tidptr;
1373 register int r7 __asm__("r7") = __NR_clone;
1375 #if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__)
1376 # define ARCH_HAS_BX
1379 # define ARCH_HAS_BLX
1383 # ifdef ARCH_HAS_BLX
1384 # define BLX(R) "blx " #R "\n"
1386 # define BLX(R) "mov lr, pc; bx " #R "\n"
1389 # define BLX(R) "mov lr, pc; mov pc," #R "\n"
1392 __asm__ __volatile__(
1393 /* %r0 = syscall(%r7 = SYSCALL(clone),
1395 * %r1 = child_stack,
1396 * %r2 = parent_tidptr,
1398 * %r4 = child_tidptr)
1401 /* Do the system call */
1410 /* In the child, now. Call "fn(arg)". */
1411 "ldr r0, [sp, #4]\n"
1412 "ldr ip, [sp], #8\n"
1414 /* Call _exit(%r0). */
1420 : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7),
1425 #endif // defined(__x86_64__) && SANITIZER_LINUX
1427 #if SANITIZER_ANDROID
1428 #if __ANDROID_API__ < 21
1429 extern "C" __attribute__((weak)) int dl_iterate_phdr(
1430 int (*)(struct dl_phdr_info *, size_t, void *), void *);
1433 static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size,
1435 // Any name starting with "lib" indicates a bug in L where library base names
1436 // are returned instead of paths.
1437 if (info->dlpi_name && info->dlpi_name[0] == 'l' &&
1438 info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') {
1439 *(bool *)data = true;
1445 static atomic_uint32_t android_api_level;
1447 static AndroidApiLevel AndroidDetectApiLevel() {
1448 if (!&dl_iterate_phdr)
1449 return ANDROID_KITKAT; // K or lower
1450 bool base_name_seen = false;
1451 dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen);
1453 return ANDROID_LOLLIPOP_MR1; // L MR1
1454 return ANDROID_POST_LOLLIPOP; // post-L
1455 // Plain L (API level 21) is completely broken wrt ASan and not very
1456 // interesting to detect.
1459 AndroidApiLevel AndroidGetApiLevel() {
1460 AndroidApiLevel level =
1461 (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
1462 if (level) return level;
1463 level = AndroidDetectApiLevel();
1464 atomic_store(&android_api_level, level, memory_order_relaxed);
1470 static HandleSignalMode GetHandleSignalModeImpl(int signum) {
1473 return common_flags()->handle_abort;
1475 return common_flags()->handle_sigill;
1477 return common_flags()->handle_sigfpe;
1479 return common_flags()->handle_segv;
1481 return common_flags()->handle_sigbus;
1483 return kHandleSignalNo;
1486 HandleSignalMode GetHandleSignalMode(int signum) {
1487 HandleSignalMode result = GetHandleSignalModeImpl(signum);
1488 if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler)
1489 return kHandleSignalExclusive;
1494 void *internal_start_thread(void(*func)(void *arg), void *arg) {
1495 // Start the thread with signals blocked, otherwise it can steal user signals.
1496 __sanitizer_sigset_t set, old;
1497 internal_sigfillset(&set);
1498 #if SANITIZER_LINUX && !SANITIZER_ANDROID
1499 // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked
1500 // on any thread, setuid call hangs (see test/tsan/setuid.c).
1501 internal_sigdelset(&set, 33);
1503 internal_sigprocmask(SIG_SETMASK, &set, &old);
1505 real_pthread_create(&th, nullptr, (void*(*)(void *arg))func, arg);
1506 internal_sigprocmask(SIG_SETMASK, &old, nullptr);
1510 void internal_join_thread(void *th) {
1511 real_pthread_join(th, nullptr);
1514 void *internal_start_thread(void (*func)(void *), void *arg) { return 0; }
1516 void internal_join_thread(void *th) {}
1519 #if defined(__aarch64__)
1520 // Android headers in the older NDK releases miss this definition.
1521 struct __sanitizer_esr_context {
1522 struct _aarch64_ctx head;
1526 static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
1527 static const u32 kEsrMagic = 0x45535201;
1528 u8 *aux = ucontext->uc_mcontext.__reserved;
1530 _aarch64_ctx *ctx = (_aarch64_ctx *)aux;
1531 if (ctx->size == 0) break;
1532 if (ctx->magic == kEsrMagic) {
1533 *esr = ((__sanitizer_esr_context *)ctx)->esr;
1542 SignalContext::WriteFlag SignalContext::GetWriteFlag(void *context) {
1543 ucontext_t *ucontext = (ucontext_t *)context;
1544 #if defined(__x86_64__) || defined(__i386__)
1545 static const uptr PF_WRITE = 1U << 1;
1546 #if SANITIZER_FREEBSD
1547 uptr err = ucontext->uc_mcontext.mc_err;
1549 uptr err = ucontext->uc_mcontext.gregs[REG_ERR];
1551 return err & PF_WRITE ? WRITE : READ;
1552 #elif defined(__arm__)
1553 static const uptr FSR_WRITE = 1U << 11;
1554 uptr fsr = ucontext->uc_mcontext.error_code;
1555 return fsr & FSR_WRITE ? WRITE : READ;
1556 #elif defined(__aarch64__)
1557 static const u64 ESR_ELx_WNR = 1U << 6;
1559 if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN;
1560 return esr & ESR_ELx_WNR ? WRITE : READ;
1563 return UNKNOWN; // FIXME: Implement.
1567 void SignalContext::DumpAllRegisters(void *context) {
1568 // FIXME: Implement this.
1571 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
1572 #if defined(__arm__)
1573 ucontext_t *ucontext = (ucontext_t*)context;
1574 *pc = ucontext->uc_mcontext.arm_pc;
1575 *bp = ucontext->uc_mcontext.arm_fp;
1576 *sp = ucontext->uc_mcontext.arm_sp;
1577 #elif defined(__aarch64__)
1578 ucontext_t *ucontext = (ucontext_t*)context;
1579 *pc = ucontext->uc_mcontext.pc;
1580 *bp = ucontext->uc_mcontext.regs[29];
1581 *sp = ucontext->uc_mcontext.sp;
1582 #elif defined(__hppa__)
1583 ucontext_t *ucontext = (ucontext_t*)context;
1584 *pc = ucontext->uc_mcontext.sc_iaoq[0];
1585 /* GCC uses %r3 whenever a frame pointer is needed. */
1586 *bp = ucontext->uc_mcontext.sc_gr[3];
1587 *sp = ucontext->uc_mcontext.sc_gr[30];
1588 #elif defined(__x86_64__)
1589 # if SANITIZER_FREEBSD
1590 ucontext_t *ucontext = (ucontext_t*)context;
1591 *pc = ucontext->uc_mcontext.mc_rip;
1592 *bp = ucontext->uc_mcontext.mc_rbp;
1593 *sp = ucontext->uc_mcontext.mc_rsp;
1595 ucontext_t *ucontext = (ucontext_t*)context;
1596 *pc = ucontext->uc_mcontext.gregs[REG_RIP];
1597 *bp = ucontext->uc_mcontext.gregs[REG_RBP];
1598 *sp = ucontext->uc_mcontext.gregs[REG_RSP];
1600 #elif defined(__i386__)
1601 # if SANITIZER_FREEBSD
1602 ucontext_t *ucontext = (ucontext_t*)context;
1603 *pc = ucontext->uc_mcontext.mc_eip;
1604 *bp = ucontext->uc_mcontext.mc_ebp;
1605 *sp = ucontext->uc_mcontext.mc_esp;
1607 ucontext_t *ucontext = (ucontext_t*)context;
1608 *pc = ucontext->uc_mcontext.gregs[REG_EIP];
1609 *bp = ucontext->uc_mcontext.gregs[REG_EBP];
1610 *sp = ucontext->uc_mcontext.gregs[REG_ESP];
1612 #elif defined(__powerpc__) || defined(__powerpc64__)
1613 ucontext_t *ucontext = (ucontext_t*)context;
1614 *pc = ucontext->uc_mcontext.regs->nip;
1615 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
1616 // The powerpc{,64}-linux ABIs do not specify r31 as the frame
1617 // pointer, but GCC always uses r31 when we need a frame pointer.
1618 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
1619 #elif defined(__sparc__)
1620 ucontext_t *ucontext = (ucontext_t*)context;
1622 # if defined (__arch64__)
1623 *pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
1624 *sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
1625 stk_ptr = (uptr *) (*sp + 2047);
1628 *pc = ucontext->uc_mcontext.gregs[REG_PC];
1629 *sp = ucontext->uc_mcontext.gregs[REG_O6];
1630 stk_ptr = (uptr *) *sp;
1633 #elif defined(__mips__)
1634 ucontext_t *ucontext = (ucontext_t*)context;
1635 *pc = ucontext->uc_mcontext.pc;
1636 *bp = ucontext->uc_mcontext.gregs[30];
1637 *sp = ucontext->uc_mcontext.gregs[29];
1638 #elif defined(__s390__)
1639 ucontext_t *ucontext = (ucontext_t*)context;
1640 # if defined(__s390x__)
1641 *pc = ucontext->uc_mcontext.psw.addr;
1643 *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff;
1645 *bp = ucontext->uc_mcontext.gregs[11];
1646 *sp = ucontext->uc_mcontext.gregs[15];
1648 # error "Unsupported arch"
1652 void MaybeReexec() {
1653 // No need to re-exec on Linux.
1656 void PrintModuleMap() { }
1658 void CheckNoDeepBind(const char *filename, int flag) {
1659 #ifdef RTLD_DEEPBIND
1660 if (flag & RTLD_DEEPBIND) {
1662 "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag"
1663 " which is incompatibe with sanitizer runtime "
1664 "(see https://github.com/google/sanitizers/issues/611 for details"
1665 "). If you want to run %s library under sanitizers please remove "
1666 "RTLD_DEEPBIND from dlopen flags.\n",
1667 filename, filename);
1673 uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
1674 uptr *largest_gap_found) {
1675 UNREACHABLE("FindAvailableMemoryRange is not available");
1679 bool GetRandom(void *buffer, uptr length) {
1680 if (!buffer || !length || length > 256)
1682 #if defined(__NR_getrandom)
1683 static atomic_uint8_t skip_getrandom_syscall;
1684 if (!atomic_load_relaxed(&skip_getrandom_syscall)) {
1685 // Up to 256 bytes, getrandom will not be interrupted.
1686 uptr res = internal_syscall(SYSCALL(getrandom), buffer, length, 0);
1688 if (internal_iserror(res, &rverrno) && rverrno == ENOSYS)
1689 atomic_store_relaxed(&skip_getrandom_syscall, 1);
1690 else if (res == length)
1694 uptr fd = internal_open("/dev/urandom", O_RDONLY);
1695 if (internal_iserror(fd))
1697 // internal_read deals with EINTR.
1698 uptr res = internal_read(fd, buffer, length);
1699 if (internal_iserror(res))
1705 } // namespace __sanitizer
1707 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX