sanitizer_linux.cc revision d054abef27369471e154ec5693949538c2fdffd9
1ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov//===-- sanitizer_linux.cc ------------------------------------------------===// 2ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// 3ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// The LLVM Compiler Infrastructure 4ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// 5ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// This file is distributed under the University of Illinois Open Source 6ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// License. See LICENSE.TXT for details. 7ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// 8ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov//===----------------------------------------------------------------------===// 9ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// 10ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// This file is shared between AddressSanitizer and ThreadSanitizer 11ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// run-time libraries and implements linux-specific functions from 12ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov// sanitizer_libc.h. 13ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov//===----------------------------------------------------------------------===// 1424e13723f8477d8c42ab8b2a7f4f69fc089842f1Evgeniy Stepanov 1524e13723f8477d8c42ab8b2a7f4f69fc089842f1Evgeniy Stepanov#include "sanitizer_platform.h" 1624e13723f8477d8c42ab8b2a7f4f69fc089842f1Evgeniy Stepanov#if SANITIZER_LINUX 17ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov 186895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov#include "sanitizer_common.h" 1994b5036ee6ba866e1702848855b6d687d1e70afaAlexey Samsonov#include "sanitizer_internal_defs.h" 20ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov#include "sanitizer_libc.h" 216fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany#include "sanitizer_linux.h" 2293da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko#include "sanitizer_mutex.h" 23a68633fb76208137ccb807914df52758ee5ca6f0Alexey Samsonov#include "sanitizer_placement_new.h" 246895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov#include "sanitizer_procmaps.h" 25a30c8f9eac981dcf137e84226810b760e35c7be1Kostya Serebryany#include "sanitizer_stacktrace.h" 265ce93fc96ab5e2defd85890da63b51cc4c57a2afAlexander Potapenko#include "sanitizer_symbolizer.h" 27ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov 28088ea2b46f97172bd0b0663a629e11cf826b84f7Peter Collingbourne#include <asm/param.h> 29b114ed83859d8d4964ac2284584733bcd2acf4f6Evgeniy Stepanov#include <dlfcn.h> 3035a7faf1fbfac678136e79d53824672dafb7d13eAlexey Samsonov#include <errno.h> 31c5d465136b911bf925f2a631e2b79f1c03e8a1b0Alexey Samsonov#include <fcntl.h> 322e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne#include <link.h> 33e5931fd7d2a74fd7fb60bd8d7f644cca51a24364Alexey Samsonov#include <pthread.h> 340969bcf2c936126b1f6e636b978aade8fc207437Alexey Samsonov#include <sched.h> 35ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov#include <sys/mman.h> 366fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany#include <sys/ptrace.h> 37e5931fd7d2a74fd7fb60bd8d7f644cca51a24364Alexey Samsonov#include <sys/resource.h> 38c5d465136b911bf925f2a631e2b79f1c03e8a1b0Alexey Samsonov#include <sys/stat.h> 39ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov#include <sys/syscall.h> 40e5931fd7d2a74fd7fb60bd8d7f644cca51a24364Alexey Samsonov#include <sys/time.h> 41ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov#include <sys/types.h> 42ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov#include <unistd.h> 43a30c8f9eac981dcf137e84226810b760e35c7be1Kostya Serebryany#include <unwind.h> 4435a7faf1fbfac678136e79d53824672dafb7d13eAlexey Samsonov 4524e13723f8477d8c42ab8b2a7f4f69fc089842f1Evgeniy Stepanov#if !SANITIZER_ANDROID 4635a7faf1fbfac678136e79d53824672dafb7d13eAlexey Samsonov#include <sys/signal.h> 4735a7faf1fbfac678136e79d53824672dafb7d13eAlexey Samsonov#endif 48fa5c41eddf77a3614da0f62044ebf741d86aeab7Dmitry Vyukov 494bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov// <linux/time.h> 504bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukovstruct kernel_timeval { 514bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov long tv_sec; 524bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov long tv_usec; 534bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov}; 544bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov 55fa5c41eddf77a3614da0f62044ebf741d86aeab7Dmitry Vyukov// <linux/futex.h> is broken on some linux distributions. 56fa5c41eddf77a3614da0f62044ebf741d86aeab7Dmitry Vyukovconst int FUTEX_WAIT = 0; 57fa5c41eddf77a3614da0f62044ebf741d86aeab7Dmitry Vyukovconst int FUTEX_WAKE = 1; 58ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov 599d0dbbaf33e5c2fe280f141e30be497d62b703a8Kostya Serebryany// Are we using 32-bit or 64-bit syscalls? 605af39e50366f1aacbebc284f572f08ad1ad07357Kostya Serebryany// x32 (which defines __x86_64__) has SANITIZER_WORDSIZE == 32 6108bfe4988de493dd3e61d02759b3f19c42f8fb78Kostya Serebryany// but it still needs to use 64-bit syscalls. 625af39e50366f1aacbebc284f572f08ad1ad07357Kostya Serebryany#if defined(__x86_64__) || SANITIZER_WORDSIZE == 64 639d0dbbaf33e5c2fe280f141e30be497d62b703a8Kostya Serebryany# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 1 649d0dbbaf33e5c2fe280f141e30be497d62b703a8Kostya Serebryany#else 659d0dbbaf33e5c2fe280f141e30be497d62b703a8Kostya Serebryany# define SANITIZER_LINUX_USES_64BIT_SYSCALLS 0 669d0dbbaf33e5c2fe280f141e30be497d62b703a8Kostya Serebryany#endif 679d0dbbaf33e5c2fe280f141e30be497d62b703a8Kostya Serebryany 68ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonovnamespace __sanitizer { 69ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov 709578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne#ifdef __x86_64__ 719578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne#include "sanitizer_syscall_linux_x86_64.inc" 729578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne#else 739578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne#include "sanitizer_syscall_generic.inc" 749578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne#endif 759578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne 76e5931fd7d2a74fd7fb60bd8d7f644cca51a24364Alexey Samsonov// --------------- sanitizer_libc.h 779578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_mmap(void *addr, uptr length, int prot, int flags, 78ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov int fd, u64 offset) { 799d0dbbaf33e5c2fe280f141e30be497d62b703a8Kostya Serebryany#if SANITIZER_LINUX_USES_64BIT_SYSCALLS 809578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_mmap, addr, length, prot, flags, fd, offset); 81ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov#else 829578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_mmap2, addr, length, prot, flags, fd, offset); 83ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov#endif 84ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov} 85ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov 869578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_munmap(void *addr, uptr length) { 879578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_munmap, addr, length); 881f11d31faa5ed89b74f7d543b1182fe8de198be5Alexey Samsonov} 891f11d31faa5ed89b74f7d543b1182fe8de198be5Alexey Samsonov 909578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_close(fd_t fd) { 919578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_close, fd); 92a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonov} 93a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonov 949578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_open(const char *filename, int flags) { 959578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_open, filename, flags); 96ee7cc4454421a176d23442382afd9a01d36e7ad4Alexey Samsonov} 97ee7cc4454421a176d23442382afd9a01d36e7ad4Alexey Samsonov 989578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_open(const char *filename, int flags, u32 mode) { 999578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_open, filename, flags, mode); 100ee7cc4454421a176d23442382afd9a01d36e7ad4Alexey Samsonov} 101ee7cc4454421a176d23442382afd9a01d36e7ad4Alexey Samsonov 1029578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr OpenFile(const char *filename, bool write) { 103ee7cc4454421a176d23442382afd9a01d36e7ad4Alexey Samsonov return internal_open(filename, 1049b8a9c1b1ce4659457178ff4c0838ac1b35ca9dcKostya Serebryany write ? O_WRONLY | O_CREAT /*| O_CLOEXEC*/ : O_RDONLY, 0660); 105c5d465136b911bf925f2a631e2b79f1c03e8a1b0Alexey Samsonov} 106c5d465136b911bf925f2a631e2b79f1c03e8a1b0Alexey Samsonov 107a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonovuptr internal_read(fd_t fd, void *buf, uptr count) { 1083334e12d33261cb8f211f2f49f28ddfa027a40c3Evgeniy Stepanov sptr res; 1099578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne HANDLE_EINTR(res, (sptr)internal_syscall(__NR_read, fd, buf, count)); 1103334e12d33261cb8f211f2f49f28ddfa027a40c3Evgeniy Stepanov return res; 111a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonov} 112a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonov 113a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonovuptr internal_write(fd_t fd, const void *buf, uptr count) { 1143334e12d33261cb8f211f2f49f28ddfa027a40c3Evgeniy Stepanov sptr res; 1159578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne HANDLE_EINTR(res, (sptr)internal_syscall(__NR_write, fd, buf, count)); 1163334e12d33261cb8f211f2f49f28ddfa027a40c3Evgeniy Stepanov return res; 117a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonov} 118a56aefd2e01940fcf88d1426f9de3d5e4b1ee203Alexey Samsonov 1192be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov#if !SANITIZER_LINUX_USES_64BIT_SYSCALLS 1202be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanovstatic void stat64_to_stat(struct stat64 *in, struct stat *out) { 1212be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov internal_memset(out, 0, sizeof(*out)); 1222be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_dev = in->st_dev; 1232be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_ino = in->st_ino; 1242be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_mode = in->st_mode; 1252be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_nlink = in->st_nlink; 1262be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_uid = in->st_uid; 1272be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_gid = in->st_gid; 1282be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_rdev = in->st_rdev; 1292be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_size = in->st_size; 1302be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_blksize = in->st_blksize; 1312be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_blocks = in->st_blocks; 1322be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_atime = in->st_atime; 1332be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_mtime = in->st_mtime; 1342be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_ctime = in->st_ctime; 1352be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov out->st_ino = in->st_ino; 1362be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov} 1372be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov#endif 1382be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov 1399578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_stat(const char *path, void *buf) { 1404c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#if SANITIZER_LINUX_USES_64BIT_SYSCALLS 1419578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_stat, path, buf); 1424c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#else 1432be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov struct stat64 buf64; 1449578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne int res = internal_syscall(__NR_stat64, path, &buf64); 1452be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov stat64_to_stat(&buf64, (struct stat *)buf); 1462be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov return res; 1474c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#endif 1484c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov} 1494c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov 1509578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_lstat(const char *path, void *buf) { 1514c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#if SANITIZER_LINUX_USES_64BIT_SYSCALLS 1529578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_lstat, path, buf); 1534c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#else 1542be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov struct stat64 buf64; 1559578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne int res = internal_syscall(__NR_lstat64, path, &buf64); 1562be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov stat64_to_stat(&buf64, (struct stat *)buf); 1572be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov return res; 1584c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#endif 1594c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov} 1604c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov 1619578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_fstat(fd_t fd, void *buf) { 1624c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#if SANITIZER_LINUX_USES_64BIT_SYSCALLS 1639578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_fstat, fd, buf); 1644c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#else 1652be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov struct stat64 buf64; 1669578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne int res = internal_syscall(__NR_fstat64, fd, &buf64); 1672be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov stat64_to_stat(&buf64, (struct stat *)buf); 1682be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov return res; 1694c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov#endif 1704c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov} 1714c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov 1728e820fcf7aafeb8101322182d742fcf99255d972Alexey Samsonovuptr internal_filesize(fd_t fd) { 173a68633fb76208137ccb807914df52758ee5ca6f0Alexey Samsonov struct stat st; 1744c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov if (internal_fstat(fd, &st)) 1754c9317a7b61e136f832d2ede70f557963fd46bceAlexey Samsonov return -1; 1768e820fcf7aafeb8101322182d742fcf99255d972Alexey Samsonov return (uptr)st.st_size; 1778e820fcf7aafeb8101322182d742fcf99255d972Alexey Samsonov} 1788e820fcf7aafeb8101322182d742fcf99255d972Alexey Samsonov 1799578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_dup2(int oldfd, int newfd) { 1809578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_dup2, oldfd, newfd); 1818e820fcf7aafeb8101322182d742fcf99255d972Alexey Samsonov} 1828e820fcf7aafeb8101322182d742fcf99255d972Alexey Samsonov 183d1b8f588d6b712b6ff2b3d58c73d71614f520122Alexey Samsonovuptr internal_readlink(const char *path, char *buf, uptr bufsize) { 1849578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_readlink, path, buf, bufsize); 185d1b8f588d6b712b6ff2b3d58c73d71614f520122Alexey Samsonov} 186d1b8f588d6b712b6ff2b3d58c73d71614f520122Alexey Samsonov 1879578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_unlink(const char *path) { 1889578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_unlink, path); 1896d6ab9eeea4a99370d7ab18ce80eb96091e2cf3fDmitry Vyukov} 1906d6ab9eeea4a99370d7ab18ce80eb96091e2cf3fDmitry Vyukov 1919578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_sched_yield() { 1929578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_sched_yield); 1930969bcf2c936126b1f6e636b978aade8fc207437Alexey Samsonov} 1940969bcf2c936126b1f6e636b978aade8fc207437Alexey Samsonov 195f882247088952deed954a19d745c2dd8871e2035Alexey Samsonovvoid internal__exit(int exitcode) { 1969578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne internal_syscall(__NR_exit_group, exitcode); 197f882247088952deed954a19d745c2dd8871e2035Alexey Samsonov Die(); // Unreachable. 198f882247088952deed954a19d745c2dd8871e2035Alexey Samsonov} 199f882247088952deed954a19d745c2dd8871e2035Alexey Samsonov 2009578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_execve(const char *filename, char *const argv[], 2019578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne char *const envp[]) { 2029578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_execve, filename, argv, envp); 2039578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne} 2049578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne 205e5931fd7d2a74fd7fb60bd8d7f644cca51a24364Alexey Samsonov// ----------------- sanitizer_common.h 20693b4cafd631b661b4b612ccdc0938f7f1e1c86d6Alexey Samsonovbool FileExists(const char *filename) { 20793b4cafd631b661b4b612ccdc0938f7f1e1c86d6Alexey Samsonov struct stat st; 2082be3a283939d4fc14ad86f6cd8be34b1468f22baEvgeniy Stepanov if (internal_stat(filename, &st)) 20993b4cafd631b661b4b612ccdc0938f7f1e1c86d6Alexey Samsonov return false; 21093b4cafd631b661b4b612ccdc0938f7f1e1c86d6Alexey Samsonov // Sanity check: filename is a regular file. 21193b4cafd631b661b4b612ccdc0938f7f1e1c86d6Alexey Samsonov return S_ISREG(st.st_mode); 21293b4cafd631b661b4b612ccdc0938f7f1e1c86d6Alexey Samsonov} 21393b4cafd631b661b4b612ccdc0938f7f1e1c86d6Alexey Samsonov 214e0023f74ea88efee329f68391b70f8adc6b21617Dmitry Vyukovuptr GetTid() { 2159578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_gettid); 216e0023f74ea88efee329f68391b70f8adc6b21617Dmitry Vyukov} 217e0023f74ea88efee329f68391b70f8adc6b21617Dmitry Vyukov 2184bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukovu64 NanoTime() { 219e57f26b5c99cedd56de76f3a10cadcecece768bdDmitry Vyukov kernel_timeval tv = {}; 2209578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne internal_syscall(__NR_gettimeofday, &tv, 0); 2214bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov return (u64)tv.tv_sec * 1000*1000*1000 + tv.tv_usec * 1000; 2224bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov} 2234bebe7bab966c82f0a8952f797ed3d490624dc62Dmitry Vyukov 2243dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov// Like getenv, but reads env directly from /proc and does not use libc. 2253dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov// This function should be called first inside __asan_init. 2263dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonovconst char *GetEnv(const char *name) { 2273dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov static char *environ; 2283dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov static uptr len; 2293dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov static bool inited; 2303dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov if (!inited) { 2313dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov inited = true; 2323dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov uptr environ_size; 2333dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov len = ReadFileToBuffer("/proc/self/environ", 2343dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov &environ, &environ_size, 1 << 26); 2353dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov } 2363dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov if (!environ || len == 0) return 0; 2373dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov uptr namelen = internal_strlen(name); 2383dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov const char *p = environ; 2393dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov while (*p != '\0') { // will happen at the \0\0 that terminates the buffer 2403dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov // proc file has the format NAME=value\0NAME=value\0NAME=value\0... 2413dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov const char* endp = 2423dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov (char*)internal_memchr(p, '\0', len - (p - environ)); 2433dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov if (endp == 0) // this entry isn't NUL terminated 2443dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov return 0; 2453dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov else if (!internal_memcmp(p, name, namelen) && p[namelen] == '=') // Match. 2463dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov return p + namelen + 1; // point after = 2473dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov p = endp + 1; 2483dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov } 2493dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov return 0; // Not found. 2503dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov} 2513dbeabb3446f203156ae03d957de9bdf50933ae4Alexey Samsonov 252eab061185ec0046d447b298a1dff84f028202a3cEvgeniy Stepanovextern "C" { 25326337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne extern void *__libc_stack_end SANITIZER_WEAK_ATTRIBUTE; 254eab061185ec0046d447b298a1dff84f028202a3cEvgeniy Stepanov} 255eab061185ec0046d447b298a1dff84f028202a3cEvgeniy Stepanov 25626337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne#if !SANITIZER_GO 25723709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbournestatic void ReadNullSepFileToArray(const char *path, char ***arr, 25823709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne int arr_size) { 25923709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne char *buff; 260d7e5bb4043adf4756e6f8cfe0f5a3165b185474dAlexey Samsonov uptr buff_size = 0; 26123709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray"); 26223709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne ReadFileToBuffer(path, &buff, &buff_size, 1024 * 1024); 26323709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne (*arr)[0] = buff; 26423709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne int count, i; 26523709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne for (count = 1, i = 1; ; i++) { 266d7e5bb4043adf4756e6f8cfe0f5a3165b185474dAlexey Samsonov if (buff[i] == 0) { 267d7e5bb4043adf4756e6f8cfe0f5a3165b185474dAlexey Samsonov if (buff[i+1] == 0) break; 26823709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne (*arr)[count] = &buff[i+1]; 26923709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible. 27023709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne count++; 271d7e5bb4043adf4756e6f8cfe0f5a3165b185474dAlexey Samsonov } 272d7e5bb4043adf4756e6f8cfe0f5a3165b185474dAlexey Samsonov } 27323709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne (*arr)[count] = 0; 27423709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne} 27526337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne#endif 27623709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne 27726337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbournestatic void GetArgsAndEnv(char*** argv, char*** envp) { 27826337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne#if !SANITIZER_GO 27926337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne if (&__libc_stack_end) { 28026337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne#endif 28126337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne uptr* stack_end = (uptr*)__libc_stack_end; 28226337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne int argc = *stack_end; 28326337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne *argv = (char**)(stack_end + 1); 28426337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne *envp = (char**)(stack_end + argc + 2); 28526337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne#if !SANITIZER_GO 28626337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne } else { 28726337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne static const int kMaxArgv = 2000, kMaxEnvp = 2000; 28826337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv); 28926337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp); 29026337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne } 29126337b60b1d551c4744454edd8e5ef3c479e3467Peter Collingbourne#endif 292eab061185ec0046d447b298a1dff84f028202a3cEvgeniy Stepanov} 293eab061185ec0046d447b298a1dff84f028202a3cEvgeniy Stepanov 294eab061185ec0046d447b298a1dff84f028202a3cEvgeniy Stepanovvoid ReExec() { 29523709c9ad9ac7c45de288f5260403426bf932db7Peter Collingbourne char **argv, **envp; 296eab061185ec0046d447b298a1dff84f028202a3cEvgeniy Stepanov GetArgsAndEnv(&argv, &envp); 2979578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne uptr rv = internal_execve("/proc/self/exe", argv, envp); 2989578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne int rverrno; 2999578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne CHECK_EQ(internal_iserror(rv, &rverrno), true); 3009578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne Printf("execve failed, errno %d\n", rverrno); 301f35eae83757946decb312deab3f0fe155fe5d580Evgeniy Stepanov Die(); 302d7e5bb4043adf4756e6f8cfe0f5a3165b185474dAlexey Samsonov} 303d7e5bb4043adf4756e6f8cfe0f5a3165b185474dAlexey Samsonov 30425742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenkovoid PrepareForSandboxing() { 30525742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenko // Some kinds of sandboxes may forbid filesystem access, so we won't be able 30625742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenko // to read the file mappings from /proc/self/maps. Luckily, neither the 30725742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenko // process will be able to load additional libraries, so it's fine to use the 30825742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenko // cached mappings. 30925742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenko MemoryMappingLayout::CacheMemoryMappings(); 3105ce93fc96ab5e2defd85890da63b51cc4c57a2afAlexander Potapenko // Same for /proc/self/exe in the symbolizer. 31151c963a812ca2fd24a72e17d1b5c127f4f9290bdPeter Collingbourne SymbolizerPrepareForSandboxing(); 31225742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenko} 31325742574510cfb41b97e32f63f107fbb9b328d13Alexander Potapenko 314e5931fd7d2a74fd7fb60bd8d7f644cca51a24364Alexey Samsonov// ----------------- sanitizer_procmaps.h 315286dd3f8afe6700e5dd9b0bdb7afd23121c98c12Dmitry Vyukov// Linker initialized. 316286dd3f8afe6700e5dd9b0bdb7afd23121c98c12Dmitry VyukovProcSelfMapsBuff MemoryMappingLayout::cached_proc_self_maps_; 317ad91267d45fef531c1082ab7974e4cc78aba5280Alexander PotapenkoStaticSpinMutex MemoryMappingLayout::cache_lock_; // Linker initialized. 31893da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko 3199ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander PotapenkoMemoryMappingLayout::MemoryMappingLayout(bool cache_enabled) { 320ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko proc_self_maps_.len = 321ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko ReadFileToBuffer("/proc/self/maps", &proc_self_maps_.data, 322ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko &proc_self_maps_.mmaped_size, 1 << 26); 3239ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko if (cache_enabled) { 3249ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko if (proc_self_maps_.mmaped_size == 0) { 3259ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko LoadFromCache(); 3269ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko CHECK_GT(proc_self_maps_.len, 0); 3279ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko } 3289ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko } else { 3299ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko CHECK_GT(proc_self_maps_.mmaped_size, 0); 33093da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko } 3316895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov Reset(); 33293da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko // FIXME: in the future we may want to cache the mappings on demand only. 3339ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko if (cache_enabled) 3349ae2883d88dd28b9c5dc862107e6e6d12a35926eAlexander Potapenko CacheMemoryMappings(); 3356895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov} 3366895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov 337e1f5dac9296df08ff83ae5fca51ce4da995b55cfAlexey SamsonovMemoryMappingLayout::~MemoryMappingLayout() { 3387385f8b8b8723064910cf9737dc929e90aeac548Alexander Potapenko // Only unmap the buffer if it is different from the cached one. Otherwise 3397385f8b8b8723064910cf9737dc929e90aeac548Alexander Potapenko // it will be unmapped when the cache is refreshed. 3407385f8b8b8723064910cf9737dc929e90aeac548Alexander Potapenko if (proc_self_maps_.data != cached_proc_self_maps_.data) { 3417385f8b8b8723064910cf9737dc929e90aeac548Alexander Potapenko UnmapOrDie(proc_self_maps_.data, proc_self_maps_.mmaped_size); 3427385f8b8b8723064910cf9737dc929e90aeac548Alexander Potapenko } 3436895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov} 3446895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov 345e1f5dac9296df08ff83ae5fca51ce4da995b55cfAlexey Samsonovvoid MemoryMappingLayout::Reset() { 346ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko current_ = proc_self_maps_.data; 3476895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov} 3486895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov 34993da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko// static 35093da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenkovoid MemoryMappingLayout::CacheMemoryMappings() { 35193da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko SpinMutexLock l(&cache_lock_); 35293da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko // Don't invalidate the cache if the mappings are unavailable. 353ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko ProcSelfMapsBuff old_proc_self_maps; 354ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko old_proc_self_maps = cached_proc_self_maps_; 355ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko cached_proc_self_maps_.len = 356ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko ReadFileToBuffer("/proc/self/maps", &cached_proc_self_maps_.data, 357ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko &cached_proc_self_maps_.mmaped_size, 1 << 26); 358ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko if (cached_proc_self_maps_.mmaped_size == 0) { 359ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko cached_proc_self_maps_ = old_proc_self_maps; 36093da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko } else { 361ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko if (old_proc_self_maps.mmaped_size) { 362ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko UnmapOrDie(old_proc_self_maps.data, 363ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko old_proc_self_maps.mmaped_size); 36493da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko } 36593da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko } 36693da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko} 36793da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko 36893da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenkovoid MemoryMappingLayout::LoadFromCache() { 36993da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko SpinMutexLock l(&cache_lock_); 370ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko if (cached_proc_self_maps_.data) { 371286dd3f8afe6700e5dd9b0bdb7afd23121c98c12Dmitry Vyukov proc_self_maps_ = cached_proc_self_maps_; 37293da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko } 37393da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko} 37493da8b6a5e0ed2ca621897504c5d06449b3d7077Alexander Potapenko 375a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany// Parse a hex value in str and update str. 376a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryanystatic uptr ParseHex(char **str) { 377a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany uptr x = 0; 378a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany char *s; 379a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany for (s = *str; ; s++) { 380a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany char c = *s; 381a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany uptr v = 0; 382a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany if (c >= '0' && c <= '9') 383a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany v = c - '0'; 384a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany else if (c >= 'a' && c <= 'f') 385a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany v = c - 'a' + 10; 386a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany else if (c >= 'A' && c <= 'F') 387a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany v = c - 'A' + 10; 388a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany else 389a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany break; 390a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany x = x * 16 + v; 391a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany } 392a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany *str = s; 393a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany return x; 394a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany} 395a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany 396ab11e0b10d077945a6e681766b41e12ac6aeb0f0Alexey Samsonovstatic bool IsOneOf(char c, char c1, char c2) { 397a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany return c == c1 || c == c2; 398a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany} 399a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany 400a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryanystatic bool IsDecimal(char c) { 401a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany return c >= '0' && c <= '9'; 402a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany} 403a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany 404e1f5dac9296df08ff83ae5fca51ce4da995b55cfAlexey Samsonovbool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset, 40545717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov char filename[], uptr filename_size, 40645717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov uptr *protection) { 407ad91267d45fef531c1082ab7974e4cc78aba5280Alexander Potapenko char *last = proc_self_maps_.data + proc_self_maps_.len; 4086895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov if (current_ >= last) return false; 4096895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov uptr dummy; 4106895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov if (!start) start = &dummy; 4116895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov if (!end) end = &dummy; 4126895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov if (!offset) offset = &dummy; 4136895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov char *next_line = (char*)internal_memchr(current_, '\n', last - current_); 4146895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov if (next_line == 0) 4156895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov next_line = last; 416a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany // Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar 417a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany *start = ParseHex(¤t_); 418bb8a9511bc748d6a4fd601d713bda584ef7bb772Kostya Serebryany CHECK_EQ(*current_++, '-'); 419a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany *end = ParseHex(¤t_); 420bb8a9511bc748d6a4fd601d713bda584ef7bb772Kostya Serebryany CHECK_EQ(*current_++, ' '); 42145717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov uptr local_protection = 0; 422ab11e0b10d077945a6e681766b41e12ac6aeb0f0Alexey Samsonov CHECK(IsOneOf(*current_, '-', 'r')); 42345717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov if (*current_++ == 'r') 42445717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov local_protection |= kProtectionRead; 425ab11e0b10d077945a6e681766b41e12ac6aeb0f0Alexey Samsonov CHECK(IsOneOf(*current_, '-', 'w')); 42645717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov if (*current_++ == 'w') 42745717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov local_protection |= kProtectionWrite; 428ab11e0b10d077945a6e681766b41e12ac6aeb0f0Alexey Samsonov CHECK(IsOneOf(*current_, '-', 'x')); 42945717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov if (*current_++ == 'x') 43045717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov local_protection |= kProtectionExecute; 431ab11e0b10d077945a6e681766b41e12ac6aeb0f0Alexey Samsonov CHECK(IsOneOf(*current_, 's', 'p')); 43245717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov if (*current_++ == 's') 43345717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov local_protection |= kProtectionShared; 43445717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov if (protection) { 43545717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov *protection = local_protection; 43645717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov } 437bb8a9511bc748d6a4fd601d713bda584ef7bb772Kostya Serebryany CHECK_EQ(*current_++, ' '); 438a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany *offset = ParseHex(¤t_); 439bb8a9511bc748d6a4fd601d713bda584ef7bb772Kostya Serebryany CHECK_EQ(*current_++, ' '); 440a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany ParseHex(¤t_); 441bb8a9511bc748d6a4fd601d713bda584ef7bb772Kostya Serebryany CHECK_EQ(*current_++, ':'); 442a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany ParseHex(¤t_); 443bb8a9511bc748d6a4fd601d713bda584ef7bb772Kostya Serebryany CHECK_EQ(*current_++, ' '); 444a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany while (IsDecimal(*current_)) 445a4e4744778e6b3067f5cf223cf28bb586c1ecf67Kostya Serebryany current_++; 4462592a0614d91fe947cd04fe7e2719d273e3e4880Kostya Serebryany // Qemu may lack the trailing space. 4472592a0614d91fe947cd04fe7e2719d273e3e4880Kostya Serebryany // http://code.google.com/p/address-sanitizer/issues/detail?id=160 4482592a0614d91fe947cd04fe7e2719d273e3e4880Kostya Serebryany // CHECK_EQ(*current_++, ' '); 4496895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov // Skip spaces. 4506895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov while (current_ < next_line && *current_ == ' ') 4516895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov current_++; 4526895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov // Fill in the filename. 4536895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov uptr i = 0; 4546895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov while (current_ < next_line) { 4556895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov if (filename && i < filename_size - 1) 4566895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov filename[i++] = *current_; 4576895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov current_++; 4586895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov } 4596895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov if (filename && i < filename_size) 4606895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov filename[i] = 0; 4616895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov current_ = next_line + 1; 4626895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov return true; 4636895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov} 4646895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov 465e1f5dac9296df08ff83ae5fca51ce4da995b55cfAlexey Samsonov// Gets the object name and the offset by walking MemoryMappingLayout. 466e1f5dac9296df08ff83ae5fca51ce4da995b55cfAlexey Samsonovbool MemoryMappingLayout::GetObjectNameAndOffset(uptr addr, uptr *offset, 467e1f5dac9296df08ff83ae5fca51ce4da995b55cfAlexey Samsonov char filename[], 46845717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov uptr filename_size, 46945717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov uptr *protection) { 47045717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov return IterateForObjectNameAndOffset(addr, offset, filename, filename_size, 47145717c9d5e39a434749ae10509111f9df1b2cdf4Alexey Samsonov protection); 4726895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov} 4736895adc39c4e09371154c8037366ad4464163ed0Alexey Samsonov 474f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukovenum MutexState { 475f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov MtxUnlocked = 0, 476f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov MtxLocked = 1, 477f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov MtxSleeping = 2 478f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov}; 479f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov 480f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry VyukovBlockingMutex::BlockingMutex(LinkerInitialized) { 481d164ed175a61529589938b3db3cab076a19acf67Dmitry Vyukov CHECK_EQ(owner_, 0); 482f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov} 483f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov 48493af5948d3e0c5bdc396f432dd0ae782f499c449Alexey SamsonovBlockingMutex::BlockingMutex() { 48593af5948d3e0c5bdc396f432dd0ae782f499c449Alexey Samsonov internal_memset(this, 0, sizeof(*this)); 48693af5948d3e0c5bdc396f432dd0ae782f499c449Alexey Samsonov} 48793af5948d3e0c5bdc396f432dd0ae782f499c449Alexey Samsonov 488f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukovvoid BlockingMutex::Lock() { 489f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 490f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked) 491f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov return; 492f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked) 4939578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne internal_syscall(__NR_futex, m, FUTEX_WAIT, MtxSleeping, 0, 0, 0); 494f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov} 495f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov 496f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukovvoid BlockingMutex::Unlock() { 497f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 498f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov u32 v = atomic_exchange(m, MtxUnlocked, memory_order_relaxed); 49948526014de78e21f7ed027a60670016bc7f5d292Dmitry Vyukov CHECK_NE(v, MtxUnlocked); 500f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov if (v == MtxSleeping) 5019578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne internal_syscall(__NR_futex, m, FUTEX_WAKE, 1, 0, 0, 0); 502f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov} 503f4f51f2cc6fa936f0c65577f82e6b62989d546eeDmitry Vyukov 504ce700979f644c790c2d9d80f5cc2a1ada0380284Alexey Samsonovvoid BlockingMutex::CheckLocked() { 505ce700979f644c790c2d9d80f5cc2a1ada0380284Alexey Samsonov atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_); 506ce700979f644c790c2d9d80f5cc2a1ada0380284Alexey Samsonov CHECK_NE(MtxUnlocked, atomic_load(m, memory_order_relaxed)); 507ce700979f644c790c2d9d80f5cc2a1ada0380284Alexey Samsonov} 508ce700979f644c790c2d9d80f5cc2a1ada0380284Alexey Samsonov 5096fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany// ----------------- sanitizer_linux.h 5106fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany// The actual size of this structure is specified by d_reclen. 5116fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany// Note that getdents64 uses a different structure format. We only provide the 5126fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany// 32-bit syscall here. 5136fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryanystruct linux_dirent { 5146fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany unsigned long d_ino; 5156fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany unsigned long d_off; 5166fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany unsigned short d_reclen; 5176fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany char d_name[256]; 5186fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany}; 5196fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5206fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany// Syscall wrappers. 5219578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_ptrace(int request, int pid, void *addr, void *data) { 5229578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_ptrace, request, pid, addr, data); 5239578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne} 5249578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne 5259578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_waitpid(int pid, int *status, int options) { 5269578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_wait4, pid, status, options, 0 /* rusage */); 5276fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5286fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5299578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_getpid() { 5309578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_getpid); 5316fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5326fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5339578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_getppid() { 5349578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_getppid); 5356fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5366fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5379578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count) { 5389578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_getdents, fd, dirp, count); 5396fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5406fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5419578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_lseek(fd_t fd, OFF_T offset, int whence) { 5429578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_lseek, fd, offset, whence); 5436fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5446fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5459578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5) { 5469578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_prctl, option, arg2, arg3, arg4, arg5); 5476fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5486fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5499578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourneuptr internal_sigaltstack(const struct sigaltstack *ss, 5506fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany struct sigaltstack *oss) { 5519578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne return internal_syscall(__NR_sigaltstack, ss, oss); 5526fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5536fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5546fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany// ThreadLister implementation. 5556fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya SerebryanyThreadLister::ThreadLister(int pid) 5566fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany : pid_(pid), 5576fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany descriptor_(-1), 55810f3ab775088bec69dd9e7b611f9b4e152f629bcAlexey Samsonov buffer_(4096), 5596fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany error_(true), 56010f3ab775088bec69dd9e7b611f9b4e152f629bcAlexey Samsonov entry_((struct linux_dirent *)buffer_.data()), 5616fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany bytes_read_(0) { 5626fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany char task_directory_path[80]; 5636fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany internal_snprintf(task_directory_path, sizeof(task_directory_path), 5646fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany "/proc/%d/task/", pid); 5659578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne uptr openrv = internal_open(task_directory_path, O_RDONLY | O_DIRECTORY); 5669578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne if (internal_iserror(openrv)) { 5676fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany error_ = true; 5686fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany Report("Can't open /proc/%d/task for reading.\n", pid); 5696fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany } else { 5706fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany error_ = false; 5719578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne descriptor_ = openrv; 5726fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany } 5736fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5746fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5756fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryanyint ThreadLister::GetNextTID() { 5766fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany int tid = -1; 5776fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany do { 5786fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany if (error_) 5796fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany return -1; 5806fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany if ((char *)entry_ >= &buffer_[bytes_read_] && !GetDirectoryEntries()) 5816fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany return -1; 5826fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany if (entry_->d_ino != 0 && entry_->d_name[0] >= '0' && 5836fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany entry_->d_name[0] <= '9') { 5846fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany // Found a valid tid. 5856fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany tid = (int)internal_atoll(entry_->d_name); 5866fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany } 5876fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany entry_ = (struct linux_dirent *)(((char *)entry_) + entry_->d_reclen); 5886fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany } while (tid < 0); 5896fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany return tid; 5906fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5916fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5926fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryanyvoid ThreadLister::Reset() { 5936fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany if (error_ || descriptor_ < 0) 5946fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany return; 5956fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany internal_lseek(descriptor_, 0, SEEK_SET); 5966fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 5976fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 5986fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya SerebryanyThreadLister::~ThreadLister() { 5996fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany if (descriptor_ >= 0) 6006fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany internal_close(descriptor_); 6016fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 6026fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 6036fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryanybool ThreadLister::error() { return error_; } 6046fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 6056fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryanybool ThreadLister::GetDirectoryEntries() { 6066fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany CHECK_GE(descriptor_, 0); 6076fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany CHECK_NE(error_, true); 6086fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany bytes_read_ = internal_getdents(descriptor_, 60910f3ab775088bec69dd9e7b611f9b4e152f629bcAlexey Samsonov (struct linux_dirent *)buffer_.data(), 61010f3ab775088bec69dd9e7b611f9b4e152f629bcAlexey Samsonov buffer_.size()); 6119578a3ecfc35a264ede1135033398e2a77a6cad6Peter Collingbourne if (internal_iserror(bytes_read_)) { 6126fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany Report("Can't read directory entries from /proc/%d/task.\n", pid_); 6136fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany error_ = true; 6146fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany return false; 6156fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany } else if (bytes_read_ == 0) { 6166fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany return false; 6176fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany } 61810f3ab775088bec69dd9e7b611f9b4e152f629bcAlexey Samsonov entry_ = (struct linux_dirent *)buffer_.data(); 6196fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany return true; 6206fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany} 6216fb47af2d2d305adbfc3d41bea589d1527a364a9Kostya Serebryany 6224df343a31cf57c309cf102b9aef870458318f579Peter Collingbourneuptr GetPageSize() { 623a8bc34e420d27c47560b0742cec295e40b0f430eKostya Serebryany#if defined(__x86_64__) || defined(__i386__) 6244df343a31cf57c309cf102b9aef870458318f579Peter Collingbourne return EXEC_PAGESIZE; 625a8bc34e420d27c47560b0742cec295e40b0f430eKostya Serebryany#else 626a8bc34e420d27c47560b0742cec295e40b0f430eKostya Serebryany return sysconf(_SC_PAGESIZE); // EXEC_PAGESIZE may not be trustworthy. 627a8bc34e420d27c47560b0742cec295e40b0f430eKostya Serebryany#endif 6284df343a31cf57c309cf102b9aef870458318f579Peter Collingbourne} 6294df343a31cf57c309cf102b9aef870458318f579Peter Collingbourne 6303de0086409d143a612a54a7a0ed809e286656188Sergey Matveev// Match full names of the form /path/to/base_name{-,.}* 6313de0086409d143a612a54a7a0ed809e286656188Sergey Matveevbool LibraryNameIs(const char *full_name, const char *base_name) { 6323de0086409d143a612a54a7a0ed809e286656188Sergey Matveev const char *name = full_name; 6333de0086409d143a612a54a7a0ed809e286656188Sergey Matveev // Strip path. 6343de0086409d143a612a54a7a0ed809e286656188Sergey Matveev while (*name != '\0') name++; 6353de0086409d143a612a54a7a0ed809e286656188Sergey Matveev while (name > full_name && *name != '/') name--; 6363de0086409d143a612a54a7a0ed809e286656188Sergey Matveev if (*name == '/') name++; 6373de0086409d143a612a54a7a0ed809e286656188Sergey Matveev uptr base_name_length = internal_strlen(base_name); 6383de0086409d143a612a54a7a0ed809e286656188Sergey Matveev if (internal_strncmp(name, base_name, base_name_length)) return false; 6393de0086409d143a612a54a7a0ed809e286656188Sergey Matveev return (name[base_name_length] == '-' || name[base_name_length] == '.'); 6403de0086409d143a612a54a7a0ed809e286656188Sergey Matveev} 6413de0086409d143a612a54a7a0ed809e286656188Sergey Matveev 642d054abef27369471e154ec5693949538c2fdffd9Evgeniy Stepanov#if !SANITIZER_ANDROID 6432e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne// Call cb for each region mapped by map. 6442e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbournevoid ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) { 6452e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne typedef ElfW(Phdr) Elf_Phdr; 6462e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne typedef ElfW(Ehdr) Elf_Ehdr; 6472e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne char *base = (char *)map->l_addr; 6482e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne Elf_Ehdr *ehdr = (Elf_Ehdr *)base; 6492e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne char *phdrs = base + ehdr->e_phoff; 6502e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne char *phdrs_end = phdrs + ehdr->e_phnum * ehdr->e_phentsize; 6512e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne 6522e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne // Find the segment with the minimum base so we can "relocate" the p_vaddr 6532e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne // fields. Typically ET_DYN objects (DSOs) have base of zero and ET_EXEC 6542e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne // objects have a non-zero base. 655f50b0fc601aea71d9fb22f01a11c7e206c666edcPeter Collingbourne uptr preferred_base = (uptr)-1; 6562e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 6572e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne Elf_Phdr *phdr = (Elf_Phdr *)iter; 6582e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne if (phdr->p_type == PT_LOAD && preferred_base > (uptr)phdr->p_vaddr) 6592e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne preferred_base = (uptr)phdr->p_vaddr; 6602e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne } 6612e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne 6622e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne // Compute the delta from the real base to get a relocation delta. 6632e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne sptr delta = (uptr)base - preferred_base; 6642e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne // Now we can figure out what the loader really mapped. 6652e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne for (char *iter = phdrs; iter != phdrs_end; iter += ehdr->e_phentsize) { 6662e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne Elf_Phdr *phdr = (Elf_Phdr *)iter; 6672e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne if (phdr->p_type == PT_LOAD) { 6682e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne uptr seg_start = phdr->p_vaddr + delta; 6692e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne uptr seg_end = seg_start + phdr->p_memsz; 6702e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne // None of these values are aligned. We consider the ragged edges of the 6712e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne // load command as defined, since they are mapped from the file. 6722e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne seg_start = RoundDownTo(seg_start, GetPageSizeCached()); 6732e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne seg_end = RoundUpTo(seg_end, GetPageSizeCached()); 6742e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne cb((void *)seg_start, seg_end - seg_start); 6752e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne } 6762e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne } 6772e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne} 678d054abef27369471e154ec5693949538c2fdffd9Evgeniy Stepanov#endif 6792e75ac983cb233daa1abfa35fb33d2bafffe2ab1Peter Collingbourne 680ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov} // namespace __sanitizer 681ae4d9caa4f47fa6abcd641719e9f520622940c17Alexey Samsonov 68246f9395baf65e17f1a3f7a3a1deee72a1560ac53Alexey Samsonov#endif // SANITIZER_LINUX 683