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-rw-r--r--lib/sanitizer_common/sanitizer_linux.cpp2141
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diff --git a/lib/sanitizer_common/sanitizer_linux.cpp b/lib/sanitizer_common/sanitizer_linux.cpp
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+++ b/lib/sanitizer_common/sanitizer_linux.cpp
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+//===-- sanitizer_linux.cpp -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// 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
+
+// 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_dup(int oldfd) {
+ return internal_syscall(SYSCALL(dup), oldfd);
+}
+
+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), (uptr)path, (uptr)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 = seconds;
+ 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) {
+ if (ShouldMockFailureToOpen(filename))
+ return false;
+ 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 internal_syscall(SYSCALL(__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) {
+ static decltype(sysctlbyname) *real = nullptr;
+ if (!real)
+ real = (decltype(sysctlbyname) *)dlsym(RTLD_NEXT, "sysctlbyname");
+ CHECK(real);
+ return real(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;
+}
+#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
+ const uptr gbyte = 1UL << 30;
+
+ // Firstly check if there are writable segments
+ // mapped to top gigabyte (e.g. stack).
+ MemoryMappingLayout proc_maps(/*cache_enabled*/true);
+ if (proc_maps.Error())
+ return 0;
+ MemoryMappedSegment segment;
+ while (proc_maps.Next(&segment)) {
+ if ((segment.end >= 3 * gbyte) && segment.IsWritable()) return 0;
+ }
+
+#if !SANITIZER_ANDROID
+ // Even if nothing is mapped, top Gb may still be accessible
+ // if we are running on 64-bit kernel.
+ // Uname may report misleading results if personality type
+ // is modified (e.g. under schroot) so check this as well.
+ struct utsname uname_info;
+ int pers = personality(0xffffffffUL);
+ if (!(pers & PER_MASK)
+ && uname(&uname_info) == 0
+ && internal_strstr(uname_info.machine, "64"))
+ return 0;
+#endif // SANITIZER_ANDROID
+
+ // Top gigabyte is reserved for kernel.
+ return gbyte;
+#else
+ return 0;
+#endif // SANITIZER_LINUX && !SANITIZER_X32
+}
+#endif // SANITIZER_WORDSIZE == 32
+
+uptr GetMaxVirtualAddress() {
+#if (SANITIZER_NETBSD || SANITIZER_OPENBSD) && defined(__x86_64__)
+ return 0x7f7ffffff000ULL; // (0x00007f8000000000 - PAGE_SIZE)
+#elif SANITIZER_WORDSIZE == 64
+# if defined(__powerpc64__) || defined(__aarch64__)
+ // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
+ // We somehow need to figure out which one we are using now and choose
+ // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
+ // Note that with 'ulimit -s unlimited' the stack is moved away from the top
+ // of the address space, so simply checking the stack address is not enough.
+ // This should (does) work for both PowerPC64 Endian modes.
+ // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
+ return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
+# elif defined(__mips64)
+ return (1ULL << 40) - 1; // 0x000000ffffffffffUL;
+# elif defined(__s390x__)
+ return (1ULL << 53) - 1; // 0x001fffffffffffffUL;
+#elif defined(__sparc__)
+ return ~(uptr)0;
+# else
+ return (1ULL << 47) - 1; // 0x00007fffffffffffUL;
+# endif
+#else // SANITIZER_WORDSIZE == 32
+# if defined(__s390__)
+ return (1ULL << 31) - 1; // 0x7fffffff;
+# else
+ return (1ULL << 32) - 1; // 0xffffffff;
+# endif
+#endif // SANITIZER_WORDSIZE
+}
+
+uptr GetMaxUserVirtualAddress() {
+ uptr addr = GetMaxVirtualAddress();
+#if SANITIZER_WORDSIZE == 32 && !defined(__s390__)
+ if (!common_flags()->full_address_space)
+ addr -= GetKernelAreaSize();
+ CHECK_LT(reinterpret_cast<uptr>(&addr), addr);
+#endif
+ return addr;
+}
+
+#if !SANITIZER_ANDROID
+uptr GetPageSize() {
+#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__i386__))
+ return EXEC_PAGESIZE;
+#elif SANITIZER_FREEBSD || SANITIZER_NETBSD
+// Use sysctl as sysconf can trigger interceptors internally.
+ int pz = 0;
+ uptr pzl = sizeof(pz);
+ int mib[2] = {CTL_HW, HW_PAGESIZE};
+ int rv = internal_sysctl(mib, 2, &pz, &pzl, nullptr, 0);
+ CHECK_EQ(rv, 0);
+ return (uptr)pz;
+#elif SANITIZER_USE_GETAUXVAL
+ return getauxval(AT_PAGESZ);
+#else
+ return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy.
+#endif
+}
+#endif // !SANITIZER_ANDROID
+
+#if !SANITIZER_OPENBSD
+uptr ReadBinaryName(/*out*/char *buf, uptr buf_len) {
+#if SANITIZER_SOLARIS
+ const char *default_module_name = getexecname();
+ CHECK_NE(default_module_name, NULL);
+ return internal_snprintf(buf, buf_len, "%s", default_module_name);
+#else
+#if SANITIZER_FREEBSD || SANITIZER_NETBSD
+#if SANITIZER_FREEBSD
+ const int Mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
+#else
+ const int Mib[4] = {CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME};
+#endif
+ const char *default_module_name = "kern.proc.pathname";
+ uptr Size = buf_len;
+ bool IsErr =
+ (internal_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 // SANITIZER_SOLARIS
+ 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;
+#endif
+}
+#endif // !SANITIZER_OPENBSD
+
+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 && !SANITIZER_OPENBSD
+ typedef ElfW(Phdr) Elf_Phdr;
+ typedef ElfW(Ehdr) Elf_Ehdr;
+#endif // !SANITIZER_FREEBSD && !SANITIZER_OPENBSD
+ 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)
+ : "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)". */
+#if SANITIZER_WORDSIZE == 32
+#ifdef __BIG_ENDIAN__
+ "lw $25,4($29);\n"
+ "lw $4,12($29);\n"
+#else
+ "lw $25,0($29);\n"
+ "lw $4,8($29);\n"
+#endif
+#else
+ "ld $25,0($29);\n"
+ "ld $4,8($29);\n"
+#endif
+ "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 structure.
+#if SANITIZER_PPC64V1
+// Back chain == 0 (SP + 112)
+// Frame (112 bytes):
+// Parameter save area (SP + 48), 8 doublewords
+// TOC save area (SP + 40)
+// Link editor doubleword (SP + 32)
+// Compiler doubleword (SP + 24)
+// LR save area (SP + 16)
+// CR save area (SP + 8)
+// Back chain (SP + 0)
+# define FRAME_SIZE 112
+# define FRAME_TOC_SAVE_OFFSET 40
+#elif SANITIZER_PPC64V2
+// Back chain == 0 (SP + 32)
+// Frame (32 bytes):
+// TOC save area (SP + 24)
+// LR save area (SP + 16)
+// CR save area (SP + 8)
+// Back chain (SP + 0)
+# define FRAME_SIZE 32
+# define FRAME_TOC_SAVE_OFFSET 24
+#else
+# error "Unsupported PPC64 ABI"
+#endif
+ if (!fn || !child_stack)
+ return -EINVAL;
+ CHECK_EQ(0, (uptr)child_stack % 16);
+
+ 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 and arg are saved across the syscall */
+ "mr 28, %5\n\t"
+ "mr 27, %8\n\t"
+
+ /* syscall
+ r0 == __NR_clone
+ 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"
+
+ /* Set up stack frame */
+ "li 29, 0\n\t"
+ "stdu 29, -8(1)\n\t"
+ "stdu 1, -%12(1)\n\t"
+ /* Do the function call */
+ "std 2, %13(1)\n\t"
+#if SANITIZER_PPC64V1
+ "ld 0, 0(28)\n\t"
+ "ld 2, 8(28)\n\t"
+ "mtctr 0\n\t"
+#elif SANITIZER_PPC64V2
+ "mr 12, 28\n\t"
+ "mtctr 12\n\t"
+#else
+# error "Unsupported PPC64 ABI"
+#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_SIZE),
+ "i" (FRAME_TOC_SAVE_OFFSET)
+ : "cr0", "cr1", "memory", "ctr", "r0", "r27", "r28", "r29");
+ return res;
+}
+#elif defined(__i386__) && SANITIZER_LINUX
+uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
+ int *parent_tidptr, void *newtls, int *child_tidptr) {
+ int res;
+ if (!fn || !child_stack)
+ return -EINVAL;
+ CHECK_EQ(0, (uptr)child_stack % 16);
+ child_stack = (char *)child_stack - 7 * sizeof(unsigned int);
+ ((unsigned int *)child_stack)[0] = (uptr)flags;
+ ((unsigned int *)child_stack)[1] = (uptr)0;
+ ((unsigned int *)child_stack)[2] = (uptr)fn;
+ ((unsigned int *)child_stack)[3] = (uptr)arg;
+ __asm__ __volatile__(
+ /* %eax = syscall(%eax = SYSCALL(clone),
+ * %ebx = flags,
+ * %ecx = child_stack,
+ * %edx = parent_tidptr,
+ * %esi = new_tls,
+ * %edi = child_tidptr)
+ */
+
+ /* Obtain flags */
+ "movl (%%ecx), %%ebx\n"
+ /* Do the system call */
+ "pushl %%ebx\n"
+ "pushl %%esi\n"
+ "pushl %%edi\n"
+ /* Remember the flag value. */
+ "movl %%ebx, (%%ecx)\n"
+ "int $0x80\n"
+ "popl %%edi\n"
+ "popl %%esi\n"
+ "popl %%ebx\n"
+
+ /* if (%eax != 0)
+ * return;
+ */
+
+ "test %%eax,%%eax\n"
+ "jnz 1f\n"
+
+ /* terminate the stack frame */
+ "xorl %%ebp,%%ebp\n"
+ /* Call FN. */
+ "call *%%ebx\n"
+#ifdef PIC
+ "call here\n"
+ "here:\n"
+ "popl %%ebx\n"
+ "addl $_GLOBAL_OFFSET_TABLE_+[.-here], %%ebx\n"
+#endif
+ /* Call exit */
+ "movl %%eax, %%ebx\n"
+ "movl %2, %%eax\n"
+ "int $0x80\n"
+ "1:\n"
+ : "=a" (res)
+ : "a"(SYSCALL(clone)), "i"(SYSCALL(exit)),
+ "c"(child_stack),
+ "d"(parent_tidptr),
+ "S"(newtls),
+ "D"(child_tidptr)
+ : "memory");
+ return res;
+}
+#elif defined(__arm__) && SANITIZER_LINUX
+uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
+ int *parent_tidptr, void *newtls, int *child_tidptr) {
+ unsigned int res;
+ if (!fn || !child_stack)
+ return -EINVAL;
+ child_stack = (char *)child_stack - 2 * sizeof(unsigned int);
+ ((unsigned int *)child_stack)[0] = (uptr)fn;
+ ((unsigned int *)child_stack)[1] = (uptr)arg;
+ register int r0 __asm__("r0") = flags;
+ register void *r1 __asm__("r1") = child_stack;
+ register int *r2 __asm__("r2") = parent_tidptr;
+ register void *r3 __asm__("r3") = newtls;
+ register int *r4 __asm__("r4") = child_tidptr;
+ register int r7 __asm__("r7") = __NR_clone;
+
+#if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__)
+# define ARCH_HAS_BX
+#endif
+#if __ARM_ARCH > 4
+# define ARCH_HAS_BLX
+#endif
+
+#ifdef ARCH_HAS_BX
+# ifdef ARCH_HAS_BLX
+# define BLX(R) "blx " #R "\n"
+# else
+# define BLX(R) "mov lr, pc; bx " #R "\n"
+# endif
+#else
+# define BLX(R) "mov lr, pc; mov pc," #R "\n"
+#endif
+
+ __asm__ __volatile__(
+ /* %r0 = syscall(%r7 = SYSCALL(clone),
+ * %r0 = flags,
+ * %r1 = child_stack,
+ * %r2 = parent_tidptr,
+ * %r3 = new_tls,
+ * %r4 = child_tidptr)
+ */
+
+ /* Do the system call */
+ "swi 0x0\n"
+
+ /* if (%r0 != 0)
+ * return %r0;
+ */
+ "cmp r0, #0\n"
+ "bne 1f\n"
+
+ /* In the child, now. Call "fn(arg)". */
+ "ldr r0, [sp, #4]\n"
+ "ldr ip, [sp], #8\n"
+ BLX(ip)
+ /* Call _exit(%r0). */
+ "mov r7, %7\n"
+ "swi 0x0\n"
+ "1:\n"
+ "mov %0, r0\n"
+ : "=r"(res)
+ : "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4), "r"(r7),
+ "i"(__NR_exit)
+ : "memory");
+ 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 AndroidDetectApiLevelStatic() {
+#if __ANDROID_API__ <= 19
+ return ANDROID_KITKAT;
+#elif __ANDROID_API__ <= 22
+ return ANDROID_LOLLIPOP_MR1;
+#else
+ return ANDROID_POST_LOLLIPOP;
+#endif
+}
+
+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.
+}
+
+extern "C" __attribute__((weak)) void* _DYNAMIC;
+
+AndroidApiLevel AndroidGetApiLevel() {
+ AndroidApiLevel level =
+ (AndroidApiLevel)atomic_load(&android_api_level, memory_order_relaxed);
+ if (level) return level;
+ level = &_DYNAMIC == nullptr ? AndroidDetectApiLevelStatic()
+ : AndroidDetectApiLevel();
+ atomic_store(&android_api_level, level, memory_order_relaxed);
+ return level;
+}
+
+#endif
+
+static HandleSignalMode GetHandleSignalModeImpl(int signum) {
+ switch (signum) {
+ case SIGABRT:
+ return common_flags()->handle_abort;
+ case SIGILL:
+ return common_flags()->handle_sigill;
+ case SIGTRAP:
+ return common_flags()->handle_sigtrap;
+ case SIGFPE:
+ return common_flags()->handle_sigfpe;
+ case SIGSEGV:
+ return common_flags()->handle_segv;
+ case SIGBUS:
+ return common_flags()->handle_sigbus;
+ }
+ return kHandleSignalNo;
+}
+
+HandleSignalMode GetHandleSignalMode(int signum) {
+ HandleSignalMode result = GetHandleSignalModeImpl(signum);
+ if (result == kHandleSignalYes && !common_flags()->allow_user_segv_handler)
+ return kHandleSignalExclusive;
+ return result;
+}
+
+#if !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
+
+#if defined(__aarch64__)
+// Android headers in the older NDK releases miss this definition.
+struct __sanitizer_esr_context {
+ struct _aarch64_ctx head;
+ uint64_t esr;
+};
+
+static bool Aarch64GetESR(ucontext_t *ucontext, u64 *esr) {
+ static const u32 kEsrMagic = 0x45535201;
+ u8 *aux = ucontext->uc_mcontext.__reserved;
+ while (true) {
+ _aarch64_ctx *ctx = (_aarch64_ctx *)aux;
+ if (ctx->size == 0) break;
+ if (ctx->magic == kEsrMagic) {
+ *esr = ((__sanitizer_esr_context *)ctx)->esr;
+ return true;
+ }
+ aux += ctx->size;
+ }
+ return false;
+}
+#endif
+
+#if SANITIZER_OPENBSD
+using Context = sigcontext;
+#else
+using Context = ucontext_t;
+#endif
+
+SignalContext::WriteFlag SignalContext::GetWriteFlag() const {
+ Context *ucontext = (Context *)context;
+#if defined(__x86_64__) || defined(__i386__)
+ static const uptr PF_WRITE = 1U << 1;
+#if SANITIZER_FREEBSD
+ uptr err = ucontext->uc_mcontext.mc_err;
+#elif SANITIZER_NETBSD
+ uptr err = ucontext->uc_mcontext.__gregs[_REG_ERR];
+#elif SANITIZER_OPENBSD
+ uptr err = ucontext->sc_err;
+#elif SANITIZER_SOLARIS && defined(__i386__)
+ const int Err = 13;
+ uptr err = ucontext->uc_mcontext.gregs[Err];
+#else
+ uptr err = ucontext->uc_mcontext.gregs[REG_ERR];
+#endif // SANITIZER_FREEBSD
+ return err & PF_WRITE ? WRITE : READ;
+#elif defined(__mips__)
+ uint32_t *exception_source;
+ uint32_t faulty_instruction;
+ uint32_t op_code;
+
+ exception_source = (uint32_t *)ucontext->uc_mcontext.pc;
+ faulty_instruction = (uint32_t)(*exception_source);
+
+ op_code = (faulty_instruction >> 26) & 0x3f;
+
+ // FIXME: Add support for FPU, microMIPS, DSP, MSA memory instructions.
+ switch (op_code) {
+ case 0x28: // sb
+ case 0x29: // sh
+ case 0x2b: // sw
+ case 0x3f: // sd
+#if __mips_isa_rev < 6
+ case 0x2c: // sdl
+ case 0x2d: // sdr
+ case 0x2a: // swl
+ case 0x2e: // swr
+#endif
+ return SignalContext::WRITE;
+
+ case 0x20: // lb
+ case 0x24: // lbu
+ case 0x21: // lh
+ case 0x25: // lhu
+ case 0x23: // lw
+ case 0x27: // lwu
+ case 0x37: // ld
+#if __mips_isa_rev < 6
+ case 0x1a: // ldl
+ case 0x1b: // ldr
+ case 0x22: // lwl
+ case 0x26: // lwr
+#endif
+ return SignalContext::READ;
+#if __mips_isa_rev == 6
+ case 0x3b: // pcrel
+ op_code = (faulty_instruction >> 19) & 0x3;
+ switch (op_code) {
+ case 0x1: // lwpc
+ case 0x2: // lwupc
+ return SignalContext::READ;
+ }
+#endif
+ }
+ return SignalContext::UNKNOWN;
+#elif defined(__arm__)
+ static const uptr FSR_WRITE = 1U << 11;
+ uptr fsr = ucontext->uc_mcontext.error_code;
+ return fsr & FSR_WRITE ? WRITE : READ;
+#elif defined(__aarch64__)
+ static const u64 ESR_ELx_WNR = 1U << 6;
+ u64 esr;
+ if (!Aarch64GetESR(ucontext, &esr)) return UNKNOWN;
+ return esr & ESR_ELx_WNR ? WRITE : READ;
+#elif defined(__sparc__)
+ // Decode the instruction to determine the access type.
+ // From OpenSolaris $SRC/uts/sun4/os/trap.c (get_accesstype).
+#if SANITIZER_SOLARIS
+ uptr pc = ucontext->uc_mcontext.gregs[REG_PC];
+#else
+ // Historical BSDism here.
+ struct sigcontext *scontext = (struct sigcontext *)context;
+#if defined(__arch64__)
+ uptr pc = scontext->sigc_regs.tpc;
+#else
+ uptr pc = scontext->si_regs.pc;
+#endif
+#endif
+ u32 instr = *(u32 *)pc;
+ return (instr >> 21) & 1 ? WRITE: READ;
+#else
+ (void)ucontext;
+ return UNKNOWN; // FIXME: Implement.
+#endif
+}
+
+bool SignalContext::IsTrueFaultingAddress() const {
+ auto si = static_cast<const siginfo_t *>(siginfo);
+ // SIGSEGV signals without a true fault address have si_code set to 128.
+ return si->si_signo == SIGSEGV && si->si_code != 128;
+}
+
+void SignalContext::DumpAllRegisters(void *context) {
+ // FIXME: Implement this.
+}
+
+static void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
+#if SANITIZER_NETBSD
+ // This covers all NetBSD architectures
+ ucontext_t *ucontext = (ucontext_t *)context;
+ *pc = _UC_MACHINE_PC(ucontext);
+ *bp = _UC_MACHINE_FP(ucontext);
+ *sp = _UC_MACHINE_SP(ucontext);
+#elif 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;
+#elif SANITIZER_OPENBSD
+ sigcontext *ucontext = (sigcontext *)context;
+ *pc = ucontext->sc_rip;
+ *bp = ucontext->sc_rbp;
+ *sp = ucontext->sc_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;
+#elif SANITIZER_OPENBSD
+ sigcontext *ucontext = (sigcontext *)context;
+ *pc = ucontext->sc_eip;
+ *bp = ucontext->sc_ebp;
+ *sp = ucontext->sc_esp;
+# else
+ ucontext_t *ucontext = (ucontext_t*)context;
+# if SANITIZER_SOLARIS
+ /* Use the numeric values: the symbolic ones are undefined by llvm
+ include/llvm/Support/Solaris.h. */
+# ifndef REG_EIP
+# define REG_EIP 14 // REG_PC
+# endif
+# ifndef REG_EBP
+# define REG_EBP 6 // REG_FP
+# endif
+# ifndef REG_ESP
+# define REG_ESP 17 // REG_SP
+# endif
+# endif
+ *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__)
+#if defined(__arch64__) || defined(__sparcv9)
+#define STACK_BIAS 2047
+#else
+#define STACK_BIAS 0
+# endif
+# if SANITIZER_SOLARIS
+ ucontext_t *ucontext = (ucontext_t *)context;
+ *pc = ucontext->uc_mcontext.gregs[REG_PC];
+ *sp = ucontext->uc_mcontext.gregs[REG_O6] + STACK_BIAS;
+#else
+ // Historical BSDism here.
+ struct sigcontext *scontext = (struct sigcontext *)context;
+#if defined(__arch64__)
+ *pc = scontext->sigc_regs.tpc;
+ *sp = scontext->sigc_regs.u_regs[14] + STACK_BIAS;
+#else
+ *pc = scontext->si_regs.pc;
+ *sp = scontext->si_regs.u_regs[14];
+#endif
+# endif
+ *bp = (uptr)((uhwptr *)*sp)[14] + STACK_BIAS;
+#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];
+#elif defined(__s390__)
+ ucontext_t *ucontext = (ucontext_t*)context;
+# if defined(__s390x__)
+ *pc = ucontext->uc_mcontext.psw.addr;
+# else
+ *pc = ucontext->uc_mcontext.psw.addr & 0x7fffffff;
+# endif
+ *bp = ucontext->uc_mcontext.gregs[11];
+ *sp = ucontext->uc_mcontext.gregs[15];
+#else
+# error "Unsupported arch"
+#endif
+}
+
+void SignalContext::InitPcSpBp() { GetPcSpBp(context, &pc, &sp, &bp); }
+
+void InitializePlatformEarly() {
+ // Do nothing.
+}
+
+void MaybeReexec() {
+ // No need to re-exec on Linux.
+}
+
+void CheckASLR() {
+#if SANITIZER_NETBSD
+ int mib[3];
+ int paxflags;
+ uptr len = sizeof(paxflags);
+
+ mib[0] = CTL_PROC;
+ mib[1] = internal_getpid();
+ mib[2] = PROC_PID_PAXFLAGS;
+
+ if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) {
+ Printf("sysctl failed\n");
+ Die();
+ }
+
+ if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_ASLR)) {
+ Printf("This sanitizer is not compatible with enabled ASLR\n");
+ Die();
+ }
+#elif SANITIZER_PPC64V2
+ // Disable ASLR for Linux PPC64LE.
+ int old_personality = personality(0xffffffff);
+ if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) {
+ VReport(1, "WARNING: Program is being run with address space layout "
+ "randomization (ASLR) enabled which prevents the thread and "
+ "memory sanitizers from working on powerpc64le.\n"
+ "ASLR will be disabled and the program re-executed.\n");
+ CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1);
+ ReExec();
+ }
+#elif SANITIZER_FREEBSD
+ int aslr_pie;
+ uptr len = sizeof(aslr_pie);
+#if SANITIZER_WORDSIZE == 64
+ if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable",
+ &aslr_pie, &len, NULL, 0) == -1)) {
+ // We're making things less 'dramatic' here since
+ // the OID is not necessarily guaranteed to be here
+ // just yet regarding FreeBSD release
+ return;
+ }
+
+ if (aslr_pie > 0) {
+ Printf("This sanitizer is not compatible with enabled ASLR "
+ "and binaries compiled with PIE\n");
+ Die();
+ }
+#endif
+ // there might be 32 bits compat for 64 bits
+ if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable",
+ &aslr_pie, &len, NULL, 0) == -1)) {
+ return;
+ }
+
+ if (aslr_pie > 0) {
+ Printf("This sanitizer is not compatible with enabled ASLR "
+ "and binaries compiled with PIE\n");
+ Die();
+ }
+#else
+ // Do nothing
+#endif
+}
+
+void CheckMPROTECT() {
+#if SANITIZER_NETBSD
+ int mib[3];
+ int paxflags;
+ uptr len = sizeof(paxflags);
+
+ mib[0] = CTL_PROC;
+ mib[1] = internal_getpid();
+ mib[2] = PROC_PID_PAXFLAGS;
+
+ if (UNLIKELY(internal_sysctl(mib, 3, &paxflags, &len, NULL, 0) == -1)) {
+ Printf("sysctl failed\n");
+ Die();
+ }
+
+ if (UNLIKELY(paxflags & CTL_PROC_PAXFLAGS_MPROTECT)) {
+ Printf("This sanitizer is not compatible with enabled MPROTECT\n");
+ Die();
+ }
+#else
+ // Do nothing
+#endif
+}
+
+void PrintModuleMap() { }
+
+void CheckNoDeepBind(const char *filename, int flag) {
+#ifdef RTLD_DEEPBIND
+ if (flag & RTLD_DEEPBIND) {
+ Report(
+ "You are trying to dlopen a %s shared library with RTLD_DEEPBIND flag"
+ " which is incompatibe with sanitizer runtime "
+ "(see https://github.com/google/sanitizers/issues/611 for details"
+ "). If you want to run %s library under sanitizers please remove "
+ "RTLD_DEEPBIND from dlopen flags.\n",
+ filename, filename);
+ Die();
+ }
+#endif
+}
+
+uptr FindAvailableMemoryRange(uptr size, uptr alignment, uptr left_padding,
+ uptr *largest_gap_found,
+ uptr *max_occupied_addr) {
+ UNREACHABLE("FindAvailableMemoryRange is not available");
+ return 0;
+}
+
+bool GetRandom(void *buffer, uptr length, bool blocking) {
+ if (!buffer || !length || length > 256)
+ return false;
+#if SANITIZER_USE_GETENTROPY
+ uptr rnd = getentropy(buffer, length);
+ int rverrno = 0;
+ if (internal_iserror(rnd, &rverrno) && rverrno == EFAULT)
+ return false;
+ else if (rnd == 0)
+ return true;
+#endif // SANITIZER_USE_GETENTROPY
+
+#if SANITIZER_USE_GETRANDOM
+ static atomic_uint8_t skip_getrandom_syscall;
+ if (!atomic_load_relaxed(&skip_getrandom_syscall)) {
+ // Up to 256 bytes, getrandom will not be interrupted.
+ uptr res = internal_syscall(SYSCALL(getrandom), buffer, length,
+ blocking ? 0 : GRND_NONBLOCK);
+ int rverrno = 0;
+ if (internal_iserror(res, &rverrno) && rverrno == ENOSYS)
+ atomic_store_relaxed(&skip_getrandom_syscall, 1);
+ else if (res == length)
+ return true;
+ }
+#endif // SANITIZER_USE_GETRANDOM
+ // Up to 256 bytes, a read off /dev/urandom will not be interrupted.
+ // blocking is moot here, O_NONBLOCK has no effect when opening /dev/urandom.
+ uptr fd = internal_open("/dev/urandom", O_RDONLY);
+ if (internal_iserror(fd))
+ return false;
+ uptr res = internal_read(fd, buffer, length);
+ if (internal_iserror(res))
+ return false;
+ internal_close(fd);
+ return true;
+}
+
+} // namespace __sanitizer
+
+#endif