| //===-- 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 |
| |
| #include "sanitizer_common.h" |
| #include "sanitizer_flags.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" |
| #include "sanitizer_stacktrace.h" |
| #include "sanitizer_symbolizer.h" |
| |
| #if !SANITIZER_FREEBSD |
| #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 <sys/mman.h> |
| #include <sys/ptrace.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <ucontext.h> |
| #include <unistd.h> |
| |
| #if SANITIZER_FREEBSD |
| #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> |
| } |
| extern char **environ; // provided by crt1 |
| #endif // SANITIZER_FREEBSD |
| |
| #if !SANITIZER_ANDROID |
| #include <sys/signal.h> |
| #endif |
| |
| #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; |
| #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 |
| |
| 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" |
| #else |
| #include "sanitizer_syscall_generic.inc" |
| #endif |
| |
| // --------------- sanitizer_libc.h |
| 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 |
| } |
| |
| 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); |
| } |
| |
| 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_FREEBSD |
| 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; |
| out->st_ino = in->st_ino; |
| } |
| #endif |
| |
| #if defined(__mips64) |
| 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; |
| out->st_atime = in->st_atime_nsec; |
| out->st_mtime = in->st_mtime_nsec; |
| out->st_ctime = in->st_ctime_nsec; |
| out->st_ino = in->st_ino; |
| } |
| #endif |
| |
| uptr internal_stat(const char *path, void *buf) { |
| #if SANITIZER_FREEBSD |
| return internal_syscall(SYSCALL(stat), path, buf); |
| #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 |
| return internal_syscall(SYSCALL(lstat), path, buf); |
| #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_LINUX_USES_64BIT_SYSCALLS |
| # if SANITIZER_MIPS64 |
| // 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); |
| #else |
| return internal_syscall(SYSCALL(readlink), (uptr)path, (uptr)buf, bufsize); |
| #endif |
| } |
| |
| uptr internal_unlink(const char *path) { |
| #if SANITIZER_USES_CANONICAL_LINUX_SYSCALLS |
| 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 |
| 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 |
| internal_syscall(SYSCALL(exit), exitcode); |
| #else |
| internal_syscall(SYSCALL(exit_group), exitcode); |
| #endif |
| Die(); // Unreachable. |
| } |
| |
| uptr internal_execve(const char *filename, char *const argv[], |
| char *const envp[]) { |
| return internal_syscall(SYSCALL(execve), (uptr)filename, (uptr)argv, |
| (uptr)envp); |
| } |
| |
| // ----------------- 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); |
| } |
| |
| uptr GetTid() { |
| #if SANITIZER_FREEBSD |
| return (uptr)pthread_self(); |
| #else |
| return internal_syscall(SYSCALL(gettid)); |
| #endif |
| } |
| |
| u64 NanoTime() { |
| #if SANITIZER_FREEBSD |
| timeval tv; |
| #else |
| kernel_timeval tv; |
| #endif |
| internal_memset(&tv, 0, sizeof(tv)); |
| internal_syscall(SYSCALL(gettimeofday), (uptr)&tv, 0); |
| return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000; |
| } |
| |
| // Like getenv, but reads env directly from /proc (on Linux) or parses the |
| // 'environ' array (on FreeBSD) and does not use libc. This function should be |
| // called first inside __asan_init. |
| const char *GetEnv(const char *name) { |
| #if SANITIZER_FREEBSD |
| 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 |
| } |
| |
| extern "C" { |
| SANITIZER_WEAK_ATTRIBUTE extern void *__libc_stack_end; |
| } |
| |
| #if !SANITIZER_GO |
| 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 |
| |
| static void GetArgsAndEnv(char*** argv, char*** envp) { |
| #if !SANITIZER_GO |
| if (&__libc_stack_end) { |
| #endif |
| 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 |
| } |
| |
| void ReExec() { |
| char **argv, **envp; |
| GetArgsAndEnv(&argv, &envp); |
| uptr rv = internal_execve("/proc/self/exe", argv, envp); |
| int rverrno; |
| CHECK_EQ(internal_iserror(rv, &rverrno), true); |
| Printf("execve failed, errno %d\n", rverrno); |
| Die(); |
| } |
| |
| 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); |
| #else |
| internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAIT, 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_relaxed); |
| CHECK_NE(v, MtxUnlocked); |
| if (v == MtxSleeping) { |
| #if SANITIZER_FREEBSD |
| _umtx_op(m, UMTX_OP_WAKE, 1, 0, 0); |
| #else |
| internal_syscall(SYSCALL(futex), (uptr)m, FUTEX_WAKE, 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)); |
| } |
| |
| // ----------------- 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. |
| 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]; |
| }; |
| |
| // 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_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 struct sigaltstack *ss, |
| struct sigaltstack *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_LINUX |
| #define SA_RESTORER 0x04000000 |
| // Doesn't set sa_restorer, 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; |
| } |
| #endif // SANITIZER_LINUX |
| |
| uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, |
| __sanitizer_sigset_t *oldset) { |
| #if SANITIZER_FREEBSD |
| 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)); |
| } |
| |
| #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); |
| } |
| #endif // SANITIZER_LINUX |
| |
| // ThreadLister implementation. |
| ThreadLister::ThreadLister(int pid) |
| : pid_(pid), |
| descriptor_(-1), |
| buffer_(4096), |
| error_(true), |
| entry_((struct linux_dirent *)buffer_.data()), |
| bytes_read_(0) { |
| char task_directory_path[80]; |
| internal_snprintf(task_directory_path, sizeof(task_directory_path), |
| "/proc/%d/task/", pid); |
| uptr openrv = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); |
| if (internal_iserror(openrv)) { |
| error_ = true; |
| Report("Can't open /proc/%d/task for reading.\n", pid); |
| } else { |
| error_ = false; |
| descriptor_ = openrv; |
| } |
| } |
| |
| int ThreadLister::GetNextTID() { |
| int tid = -1; |
| do { |
| if (error_) |
| return -1; |
| if ((char *)entry_ >= &buffer_[bytes_read_] && !GetDirectoryEntries()) |
| return -1; |
| if (entry_->d_ino != 0 && entry_->d_name[0] >= '0' && |
| entry_->d_name[0] <= '9') { |
| // Found a valid tid. |
| tid = (int)internal_atoll(entry_->d_name); |
| } |
| entry_ = (struct linux_dirent *)(((char *)entry_) + entry_->d_reclen); |
| } while (tid < 0); |
| return tid; |
| } |
| |
| void ThreadLister::Reset() { |
| if (error_ || descriptor_ < 0) |
| return; |
| internal_lseek(descriptor_, 0, SEEK_SET); |
| } |
| |
| ThreadLister::~ThreadLister() { |
| if (descriptor_ >= 0) |
| internal_close(descriptor_); |
| } |
| |
| bool ThreadLister::error() { return error_; } |
| |
| bool ThreadLister::GetDirectoryEntries() { |
| CHECK_GE(descriptor_, 0); |
| CHECK_NE(error_, true); |
| bytes_read_ = internal_getdents(descriptor_, |
| (struct linux_dirent *)buffer_.data(), |
| buffer_.size()); |
| if (internal_iserror(bytes_read_)) { |
| Report("Can't read directory entries from /proc/%d/task.\n", pid_); |
| error_ = true; |
| return false; |
| } else if (bytes_read_ == 0) { |
| return false; |
| } |
| entry_ = (struct linux_dirent *)buffer_.data(); |
| return true; |
| } |
| |
| uptr GetPageSize() { |
| #if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__)) |
| return EXEC_PAGESIZE; |
| #else |
| return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. |
| #endif |
| } |
| |
| uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) { |
| #if SANITIZER_FREEBSD |
| const int Mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 }; |
| const char *default_module_name = "kern.proc.pathname"; |
| size_t Size = buf_len; |
| bool IsErr = (sysctl(Mib, ARRAY_SIZE(Mib), buf, &Size, NULL, 0) != 0); |
| int readlink_error = IsErr ? errno : 0; |
| uptr module_name_len = Size; |
| #else |
| const char *default_module_name = "/proc/self/exe"; |
| uptr module_name_len = internal_readlink( |
| default_module_name, buf, buf_len); |
| int readlink_error; |
| bool IsErr = internal_iserror(module_name_len, &readlink_error); |
| #endif |
| if (IsErr) { |
| // We can't read binary name for some reason, assume it's unknown. |
| Report("WARNING: reading executable name failed with errno %d, " |
| "some stack frames may not be symbolized\n", readlink_error); |
| module_name_len = internal_snprintf(buf, buf_len, "%s", |
| default_module_name); |
| CHECK_LT(module_name_len, buf_len); |
| } |
| return module_name_len; |
| } |
| |
| uptr ReadLongProcessName(/*out*/ char *buf, uptr buf_len) { |
| #if SANITIZER_LINUX |
| char *tmpbuf; |
| uptr tmpsize; |
| uptr tmplen; |
| if (ReadFileToBuffer("/proc/self/cmdline", &tmpbuf, &tmpsize, &tmplen, |
| 1024 * 1024)) { |
| internal_strncpy(buf, tmpbuf, buf_len); |
| UnmapOrDie(tmpbuf, tmpsize); |
| return internal_strlen(buf); |
| } |
| #endif |
| return ReadBinaryName(buf, buf_len); |
| } |
| |
| // Match full names of the form /path/to/base_name{-,.}* |
| bool LibraryNameIs(const char *full_name, const char *base_name) { |
| const char *name = full_name; |
| // Strip path. |
| while (*name != '\0') name++; |
| while (name > full_name && *name != '/') name--; |
| if (*name == '/') name++; |
| uptr base_name_length = internal_strlen(base_name); |
| if (internal_strncmp(name, base_name, base_name_length)) return false; |
| return (name[base_name_length] == '-' || name[base_name_length] == '.'); |
| } |
| |
| #if !SANITIZER_ANDROID |
| // Call cb for each region mapped by map. |
| void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { |
| CHECK_NE(map, nullptr); |
| #if !SANITIZER_FREEBSD |
| typedef ElfW(Phdr) Elf_Phdr; |
| typedef ElfW(Ehdr) Elf_Ehdr; |
| #endif // !SANITIZER_FREEBSD |
| char *base = (char *)map->l_addr; |
| Elf_Ehdr *ehdr = (Elf_Ehdr *)base; |
| char *phdrs = base + ehdr->e_phoff; |
| char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; |
| |
| // Find the segment with the minimum base so we can "relocate" the p_vaddr |
| // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC |
| // objects have a non-zero base. |
| uptr preferred_base = (uptr)-1; |
| for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { |
| Elf_Phdr *phdr = (Elf_Phdr *)iter; |
| if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) |
| preferred_base = (uptr)phdr->p_vaddr; |
| } |
| |
| // Compute the delta from the real base to get a relocation delta. |
| sptr delta = (uptr)base - preferred_base; |
| // Now we can figure out what the loader really mapped. |
| for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { |
| Elf_Phdr *phdr = (Elf_Phdr *)iter; |
| if (phdr->p_type == PT_LOAD) { |
| uptr seg_start = phdr->p_vaddr + delta; |
| uptr seg_end = seg_start + phdr->p_memsz; |
| // None of these values are aligned. We consider the ragged edges of the |
| // load command as defined, since they are mapped from the file. |
| seg_start = RoundDownTo(seg_start, GetPageSizeCached()); |
| seg_end = RoundUpTo(seg_end, GetPageSizeCached()); |
| cb((void *)seg_start, seg_end - seg_start); |
| } |
| } |
| } |
| #endif |
| |
| #if defined(__x86_64__) && SANITIZER_LINUX |
| // We cannot use glibc's clone wrapper, because it messes with the child |
| // task's TLS. It writes the PID and TID of the child task to its thread |
| // descriptor, but in our case the child task shares the thread descriptor with |
| // the parent (because we don't know how to allocate a new thread |
| // descriptor to keep glibc happy). So the stock version of clone(), when |
| // used with CLONE_VM, would end up corrupting the parent's thread descriptor. |
| uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, |
| int *parent_tidptr, void *newtls, int *child_tidptr) { |
| long long res; |
| if (!fn || !child_stack) |
| return -EINVAL; |
| CHECK_EQ(0, (uptr)child_stack % 16); |
| child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); |
| ((unsigned long long *)child_stack)[0] = (uptr)fn; |
| ((unsigned long long *)child_stack)[1] = (uptr)arg; |
| register void *r8 __asm__("r8") = newtls; |
| register int *r10 __asm__("r10") = child_tidptr; |
| __asm__ __volatile__( |
| /* %rax = syscall(%rax = SYSCALL(clone), |
| * %rdi = flags, |
| * %rsi = child_stack, |
| * %rdx = parent_tidptr, |
| * %r8 = new_tls, |
| * %r10 = child_tidptr) |
| */ |
| "syscall\n" |
| |
| /* if (%rax != 0) |
| * return; |
| */ |
| "testq %%rax,%%rax\n" |
| "jnz 1f\n" |
| |
| /* In the child. Terminate unwind chain. */ |
| // XXX: We should also terminate the CFI unwind chain |
| // here. Unfortunately clang 3.2 doesn't support the |
| // necessary CFI directives, so we skip that part. |
| "xorq %%rbp,%%rbp\n" |
| |
| /* Call "fn(arg)". */ |
| "popq %%rax\n" |
| "popq %%rdi\n" |
| "call *%%rax\n" |
| |
| /* Call _exit(%rax). */ |
| "movq %%rax,%%rdi\n" |
| "movq %2,%%rax\n" |
| "syscall\n" |
| |
| /* Return to parent. */ |
| "1:\n" |
| : "=a" (res) |
| : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)), |
| "S"(child_stack), |
| "D"(flags), |
| "d"(parent_tidptr), |
| "r"(r8), |
| "r"(r10) |
| : "rsp", "memory", "r11", "rcx"); |
| return res; |
| } |
| #elif defined(__mips__) |
| uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, |
| int *parent_tidptr, void *newtls, int *child_tidptr) { |
| long long res; |
| if (!fn || !child_stack) |
| return -EINVAL; |
| CHECK_EQ(0, (uptr)child_stack % 16); |
| child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); |
| ((unsigned long long *)child_stack)[0] = (uptr)fn; |
| ((unsigned long long *)child_stack)[1] = (uptr)arg; |
| register void *a3 __asm__("$7") = newtls; |
| register int *a4 __asm__("$8") = child_tidptr; |
| // We don't have proper CFI directives here because it requires alot of code |
| // for very marginal benefits. |
| __asm__ __volatile__( |
| /* $v0 = syscall($v0 = __NR_clone, |
| * $a0 = flags, |
| * $a1 = child_stack, |
| * $a2 = parent_tidptr, |
| * $a3 = new_tls, |
| * $a4 = child_tidptr) |
| */ |
| ".cprestore 16;\n" |
| "move $4,%1;\n" |
| "move $5,%2;\n" |
| "move $6,%3;\n" |
| "move $7,%4;\n" |
| /* Store the fifth argument on stack |
| * if we are using 32-bit abi. |
| */ |
| #if SANITIZER_WORDSIZE == 32 |
| "lw %5,16($29);\n" |
| #else |
| "move $8,%5;\n" |
| #endif |
| "li $2,%6;\n" |
| "syscall;\n" |
| |
| /* if ($v0 != 0) |
| * return; |
| */ |
| "bnez $2,1f;\n" |
| |
| /* Call "fn(arg)". */ |
| "ld $25,0($29);\n" |
| "ld $4,8($29);\n" |
| "jal $25;\n" |
| |
| /* Call _exit($v0). */ |
| "move $4,$2;\n" |
| "li $2,%7;\n" |
| "syscall;\n" |
| |
| /* Return to parent. */ |
| "1:\n" |
| : "=r" (res) |
| : "r"(flags), |
| "r"(child_stack), |
| "r"(parent_tidptr), |
| "r"(a3), |
| "r"(a4), |
| "i"(__NR_clone), |
| "i"(__NR_exit) |
| : "memory", "$29" ); |
| return res; |
| } |
| #elif defined(__aarch64__) |
| uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, |
| int *parent_tidptr, void *newtls, int *child_tidptr) { |
| long long res; |
| if (!fn || !child_stack) |
| return -EINVAL; |
| CHECK_EQ(0, (uptr)child_stack % 16); |
| child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); |
| ((unsigned long long *)child_stack)[0] = (uptr)fn; |
| ((unsigned long long *)child_stack)[1] = (uptr)arg; |
| |
| register int (*__fn)(void *) __asm__("x0") = fn; |
| register void *__stack __asm__("x1") = child_stack; |
| register int __flags __asm__("x2") = flags; |
| register void *__arg __asm__("x3") = arg; |
| register int *__ptid __asm__("x4") = parent_tidptr; |
| register void *__tls __asm__("x5") = newtls; |
| register int *__ctid __asm__("x6") = child_tidptr; |
| |
| __asm__ __volatile__( |
| "mov x0,x2\n" /* flags */ |
| "mov x2,x4\n" /* ptid */ |
| "mov x3,x5\n" /* tls */ |
| "mov x4,x6\n" /* ctid */ |
| "mov x8,%9\n" /* clone */ |
| |
| "svc 0x0\n" |
| |
| /* if (%r0 != 0) |
| * return %r0; |
| */ |
| "cmp x0, #0\n" |
| "bne 1f\n" |
| |
| /* In the child, now. Call "fn(arg)". */ |
| "ldp x1, x0, [sp], #16\n" |
| "blr x1\n" |
| |
| /* Call _exit(%r0). */ |
| "mov x8, %10\n" |
| "svc 0x0\n" |
| "1:\n" |
| |
| : "=r" (res) |
| : "i"(-EINVAL), |
| "r"(__fn), "r"(__stack), "r"(__flags), "r"(__arg), |
| "r"(__ptid), "r"(__tls), "r"(__ctid), |
| "i"(__NR_clone), "i"(__NR_exit) |
| : "x30", "memory"); |
| return res; |
| } |
| #elif defined(__powerpc64__) |
| uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, |
| int *parent_tidptr, void *newtls, int *child_tidptr) { |
| long long res; |
| /* Stack frame offsets. */ |
| #if _CALL_ELF != 2 |
| #define FRAME_MIN_SIZE 112 |
| #define FRAME_TOC_SAVE 40 |
| #else |
| #define FRAME_MIN_SIZE 32 |
| #define FRAME_TOC_SAVE 24 |
| #endif |
| if (!fn || !child_stack) |
| return -EINVAL; |
| CHECK_EQ(0, (uptr)child_stack % 16); |
| child_stack = (char *)child_stack - 2 * sizeof(unsigned long long); |
| ((unsigned long long *)child_stack)[0] = (uptr)fn; |
| ((unsigned long long *)child_stack)[1] = (uptr)arg; |
| |
| register int (*__fn)(void *) __asm__("r3") = fn; |
| register void *__cstack __asm__("r4") = child_stack; |
| register int __flags __asm__("r5") = flags; |
| register void * __arg __asm__("r6") = arg; |
| register int * __ptidptr __asm__("r7") = parent_tidptr; |
| register void * __newtls __asm__("r8") = newtls; |
| register int * __ctidptr __asm__("r9") = child_tidptr; |
| |
| __asm__ __volatile__( |
| /* fn, arg, child_stack are saved acrVoss the syscall */ |
| "mr 28, %5\n\t" |
| "mr 29, %6\n\t" |
| "mr 27, %8\n\t" |
| |
| /* syscall |
| r3 == flags |
| r4 == child_stack |
| r5 == parent_tidptr |
| r6 == newtls |
| r7 == child_tidptr */ |
| "mr 3, %7\n\t" |
| "mr 5, %9\n\t" |
| "mr 6, %10\n\t" |
| "mr 7, %11\n\t" |
| "li 0, %3\n\t" |
| "sc\n\t" |
| |
| /* Test if syscall was successful */ |
| "cmpdi cr1, 3, 0\n\t" |
| "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" |
| "bne- cr1, 1f\n\t" |
| |
| /* Do the function call */ |
| "std 2, %13(1)\n\t" |
| #if _CALL_ELF != 2 |
| "ld 0, 0(28)\n\t" |
| "ld 2, 8(28)\n\t" |
| "mtctr 0\n\t" |
| #else |
| "mr 12, 28\n\t" |
| "mtctr 12\n\t" |
| #endif |
| "mr 3, 27\n\t" |
| "bctrl\n\t" |
| "ld 2, %13(1)\n\t" |
| |
| /* Call _exit(r3) */ |
| "li 0, %4\n\t" |
| "sc\n\t" |
| |
| /* Return to parent */ |
| "1:\n\t" |
| "mr %0, 3\n\t" |
| : "=r" (res) |
| : "0" (-1), "i" (EINVAL), |
| "i" (__NR_clone), "i" (__NR_exit), |
| "r" (__fn), "r" (__cstack), "r" (__flags), |
| "r" (__arg), "r" (__ptidptr), "r" (__newtls), |
| "r" (__ctidptr), "i" (FRAME_MIN_SIZE), "i" (FRAME_TOC_SAVE) |
| : "cr0", "cr1", "memory", "ctr", |
| "r0", "r29", "r27", "r28"); |
| return res; |
| } |
| #endif // defined(__x86_64__) && SANITIZER_LINUX |
| |
| #if SANITIZER_ANDROID |
| #if __ANDROID_API__ < 21 |
| extern "C" __attribute__((weak)) int dl_iterate_phdr( |
| int (*)(struct dl_phdr_info *, size_t, void *), void *); |
| #endif |
| |
| static int dl_iterate_phdr_test_cb(struct dl_phdr_info *info, size_t size, |
| void *data) { |
| // Any name starting with "lib" indicates a bug in L where library base names |
| // are returned instead of paths. |
| if (info->dlpi_name && info->dlpi_name[0] == 'l' && |
| info->dlpi_name[1] == 'i' && info->dlpi_name[2] == 'b') { |
| *(bool *)data = true; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static atomic_uint32_t android_api_level; |
| |
| static AndroidApiLevel AndroidDetectApiLevel() { |
| if (!&dl_iterate_phdr) |
| return ANDROID_KITKAT; // K or lower |
| bool base_name_seen = false; |
| dl_iterate_phdr(dl_iterate_phdr_test_cb, &base_name_seen); |
| if (base_name_seen) |
| return ANDROID_LOLLIPOP_MR1; // L MR1 |
| return ANDROID_POST_LOLLIPOP; // post-L |
| // Plain L (API level 21) is completely broken wrt ASan and not very |
| // interesting to detect. |
| } |
| |
| AndroidApiLevel AndroidGetApiLevel() { |
| AndroidApiLevel level = |
| (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed); |
| if (level) return level; |
| level = AndroidDetectApiLevel(); |
| atomic_store(&android_api_level, level, memory_order_relaxed); |
| return level; |
| } |
| |
| #endif |
| |
| bool IsDeadlySignal(int signum) { |
| if (common_flags()->handle_abort && signum == SIGABRT) |
| return true; |
| if (common_flags()->handle_sigill && signum == SIGILL) |
| return true; |
| if (common_flags()->handle_sigfpe && signum == SIGFPE) |
| return true; |
| return (signum == SIGSEGV || signum == SIGBUS) && common_flags()->handle_segv; |
| } |
| |
| #ifndef SANITIZER_GO |
| 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); |
| #if SANITIZER_LINUX && !SANITIZER_ANDROID |
| // Glibc uses SIGSETXID signal during setuid call. If this signal is blocked |
| // on any thread, setuid call hangs (see test/tsan/setuid.c). |
| internal_sigdelset(&set, 33); |
| #endif |
| internal_sigprocmask(SIG_SETMASK, &set, &old); |
| void *th; |
| real_pthread_create(&th, nullptr, (void*(*)(void *arg))func, arg); |
| internal_sigprocmask(SIG_SETMASK, &old, nullptr); |
| return th; |
| } |
| |
| void internal_join_thread(void *th) { |
| real_pthread_join(th, nullptr); |
| } |
| #else |
| void *internal_start_thread(void (*func)(void *), void *arg) { return 0; } |
| |
| void internal_join_thread(void *th) {} |
| #endif |
| |
| void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { |
| #if defined(__arm__) |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.arm_pc; |
| *bp = ucontext->uc_mcontext.arm_fp; |
| *sp = ucontext->uc_mcontext.arm_sp; |
| #elif defined(__aarch64__) |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.pc; |
| *bp = ucontext->uc_mcontext.regs[29]; |
| *sp = ucontext->uc_mcontext.sp; |
| #elif defined(__hppa__) |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.sc_iaoq[0]; |
| /* GCC uses %r3 whenever a frame pointer is needed. */ |
| *bp = ucontext->uc_mcontext.sc_gr[3]; |
| *sp = ucontext->uc_mcontext.sc_gr[30]; |
| #elif defined(__x86_64__) |
| # if SANITIZER_FREEBSD |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.mc_rip; |
| *bp = ucontext->uc_mcontext.mc_rbp; |
| *sp = ucontext->uc_mcontext.mc_rsp; |
| # else |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.gregs[REG_RIP]; |
| *bp = ucontext->uc_mcontext.gregs[REG_RBP]; |
| *sp = ucontext->uc_mcontext.gregs[REG_RSP]; |
| # endif |
| #elif defined(__i386__) |
| # if SANITIZER_FREEBSD |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.mc_eip; |
| *bp = ucontext->uc_mcontext.mc_ebp; |
| *sp = ucontext->uc_mcontext.mc_esp; |
| # else |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.gregs[REG_EIP]; |
| *bp = ucontext->uc_mcontext.gregs[REG_EBP]; |
| *sp = ucontext->uc_mcontext.gregs[REG_ESP]; |
| # endif |
| #elif defined(__powerpc__) || defined(__powerpc64__) |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.regs->nip; |
| *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; |
| // The powerpc{,64}-linux ABIs do not specify r31 as the frame |
| // pointer, but GCC always uses r31 when we need a frame pointer. |
| *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; |
| #elif defined(__sparc__) |
| ucontext_t *ucontext = (ucontext_t*)context; |
| uptr *stk_ptr; |
| # if defined (__arch64__) |
| *pc = ucontext->uc_mcontext.mc_gregs[MC_PC]; |
| *sp = ucontext->uc_mcontext.mc_gregs[MC_O6]; |
| stk_ptr = (uptr *) (*sp + 2047); |
| *bp = stk_ptr[15]; |
| # else |
| *pc = ucontext->uc_mcontext.gregs[REG_PC]; |
| *sp = ucontext->uc_mcontext.gregs[REG_O6]; |
| stk_ptr = (uptr *) *sp; |
| *bp = stk_ptr[15]; |
| # endif |
| #elif defined(__mips__) |
| ucontext_t *ucontext = (ucontext_t*)context; |
| *pc = ucontext->uc_mcontext.pc; |
| *bp = ucontext->uc_mcontext.gregs[30]; |
| *sp = ucontext->uc_mcontext.gregs[29]; |
| #else |
| # error "Unsupported arch" |
| #endif |
| } |
| |
| void DisableReexec() { |
| // No need to re-exec on Linux. |
| } |
| |
| void MaybeReexec() { |
| // No need to re-exec on Linux. |
| } |
| |
| } // namespace __sanitizer |
| |
| #endif // SANITIZER_FREEBSD || SANITIZER_LINUX |
