asan_mac.cc revision 64ce2db7c838cd95315f7a4428e8a628eaa3e2fc
11e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany//===-- asan_mac.cc -------------------------------------------------------===// 21e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 31e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The LLVM Compiler Infrastructure 41e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 51e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// This file is distributed under the University of Illinois Open Source 61e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// License. See LICENSE.TXT for details. 71e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 81e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany//===----------------------------------------------------------------------===// 91e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// This file is a part of AddressSanitizer, an address sanity checker. 111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Mac-specific details. 131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany//===----------------------------------------------------------------------===// 141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 15d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany#ifdef __APPLE__ 161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_mac.h" 181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1964ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov#include "asan_interceptors.h" 201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_internal.h" 21895b3872acb5bcccb1769ea69d37dd33c722f99dAlexander Potapenko#include "asan_mapping.h" 228a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#include "asan_procmaps.h" 231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_stack.h" 241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_thread.h" 251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_thread_registry.h" 261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 271e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko#include <crt_externs.h> // for _NSGetEnviron 288a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#include <mach-o/dyld.h> 299b993e8cd0f8964782ee93524603d0c53adc2249Kostya Serebryany#include <mach-o/loader.h> 301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <sys/mman.h> 31ef14ff6512d7b2e20aa3206dff820b5f90285420Kostya Serebryany#include <sys/resource.h> 3259dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko#include <sys/sysctl.h> 339107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany#include <sys/ucontext.h> 34c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany#include <pthread.h> 35a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany#include <fcntl.h> 361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <unistd.h> 37d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany#include <libkern/OSAtomic.h> 3864ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov#include <CoreFoundation/CFString.h> 391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace __asan { 411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 429107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryanyvoid GetPcSpBp(void *context, uintptr_t *pc, uintptr_t *sp, uintptr_t *bp) { 439107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany ucontext_t *ucontext = (ucontext_t*)context; 449107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany# if __WORDSIZE == 64 459107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *pc = ucontext->uc_mcontext->__ss.__rip; 469107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *bp = ucontext->uc_mcontext->__ss.__rbp; 479107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *sp = ucontext->uc_mcontext->__ss.__rsp; 489107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany# else 499107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *pc = ucontext->uc_mcontext->__ss.__eip; 509107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *bp = ucontext->uc_mcontext->__ss.__ebp; 519107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *sp = ucontext->uc_mcontext->__ss.__esp; 529107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany# endif // __WORDSIZE 539107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany} 549107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany 5538dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonovenum { 5638dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_UNKNOWN = 0, 5738dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_LEOPARD, 5838dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_SNOW_LEOPARD, 5938dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_LION, 6038dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov}; 6138dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov 6238dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonovstatic int GetMacosVersion() { 6359dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko int mib[2] = { CTL_KERN, KERN_OSRELEASE }; 6459dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko char version[100]; 6559dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko size_t len = 0, maxlen = sizeof(version) / sizeof(version[0]); 6659dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko for (int i = 0; i < maxlen; i++) version[i] = '\0'; 6759dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko // Get the version length. 6859dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko CHECK(sysctl(mib, 2, NULL, &len, NULL, 0) != -1); 6959dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko CHECK(len < maxlen); 7059dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko CHECK(sysctl(mib, 2, version, &len, NULL, 0) != -1); 7159dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko switch (version[0]) { 7259dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '9': return MACOS_VERSION_LEOPARD; 7359dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '1': { 7459dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko switch (version[1]) { 7559dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '0': return MACOS_VERSION_SNOW_LEOPARD; 7659dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '1': return MACOS_VERSION_LION; 7759dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko default: return MACOS_VERSION_UNKNOWN; 7859dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko } 7959dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko } 8059dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko default: return MACOS_VERSION_UNKNOWN; 8159dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko } 8259dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko} 8359dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko 8438dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonovbool PlatformHasDifferentMemcpyAndMemmove() { 8538dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // On OS X 10.7 memcpy() and memmove() are both resolved 8638dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // into memmove$VARIANT$sse42. 8738dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // See also http://code.google.com/p/address-sanitizer/issues/detail?id=34. 8838dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // TODO(glider): need to check dynamically that memcpy() and memmove() are 8938dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // actually the same function. 9038dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov return GetMacosVersion() == MACOS_VERSION_SNOW_LEOPARD; 9138dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov} 9238dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov 931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// No-op. Mac does not support static linkage anyway. 941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid *AsanDoesNotSupportStaticLinkage() { 951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return NULL; 961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 98afaf71f0b2c6455614e2ab8f208312dea0871fe9Alexey Samsonovstatic inline bool IntervalsAreSeparate(uintptr_t start1, uintptr_t end1, 99afaf71f0b2c6455614e2ab8f208312dea0871fe9Alexey Samsonov uintptr_t start2, uintptr_t end2) { 100f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko CHECK(start1 <= end1); 101f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko CHECK(start2 <= end2); 102afaf71f0b2c6455614e2ab8f208312dea0871fe9Alexey Samsonov return (end1 < start2) || (end2 < start1); 103f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko} 104f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko 105f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko// FIXME: this is thread-unsafe, but should not cause problems most of the time. 106f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko// When the shadow is mapped only a single thread usually exists (plus maybe 107f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko// several worker threads on Mac, which aren't expected to map big chunks of 108f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko// memory). 109f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenkobool AsanShadowRangeIsAvailable() { 110f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko AsanProcMaps procmaps; 111f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko uintptr_t start, end; 112f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko bool available = true; 113f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko while (procmaps.Next(&start, &end, 114650a1e163ef05b89f40143eb8b9af4f64ad0b68dKostya Serebryany /*offset*/NULL, /*filename*/NULL, /*filename_size*/0)) { 115f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko if (!IntervalsAreSeparate(start, end, 116f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko kLowShadowBeg - kMmapGranularity, 117f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko kHighShadowEnd)) { 118f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko available = false; 119f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko break; 120f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko } 121f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko } 122f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko return available; 123f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko} 124f73a6a3f81573ba85a5e29955980818b18b0a58aAlexander Potapenko 1254803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryanybool AsanInterceptsSignal(int signum) { 1264803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryany return (signum == SIGSEGV || signum == SIGBUS) && FLAG_handle_segv; 1274803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryany} 1284803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryany 129a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryanystatic void *asan_mmap(void *addr, size_t length, int prot, int flags, 1301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int fd, uint64_t offset) { 1311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return mmap(addr, length, prot, flags, fd, offset); 1321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1340ecf5eb729dd81a43f8585cb438d3cb2a35899edKostya Serebryanysize_t AsanWrite(int fd, const void *buf, size_t count) { 1351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return write(fd, buf, count); 1361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 138de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyvoid *AsanMmapSomewhereOrDie(size_t size, const char *mem_type) { 139de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany size = RoundUpTo(size, kPageSize); 140de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany void *res = asan_mmap(0, size, 141de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany PROT_READ | PROT_WRITE, 142de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany MAP_PRIVATE | MAP_ANON, -1, 0); 143de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany if (res == (void*)-1) { 144de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany OutOfMemoryMessageAndDie(mem_type, size); 145de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany } 146de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return res; 147de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 148de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 149a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryanyvoid *AsanMmapFixedNoReserve(uintptr_t fixed_addr, size_t size) { 150a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany return asan_mmap((void*)fixed_addr, size, 151a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany PROT_READ | PROT_WRITE, 152a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, 153a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 0, 0); 154a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany} 155a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 156a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryanyvoid *AsanMprotect(uintptr_t fixed_addr, size_t size) { 157a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany return asan_mmap((void*)fixed_addr, size, 158a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany PROT_NONE, 159a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, 160a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 0, 0); 161a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany} 162a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 163de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyvoid AsanUnmapOrDie(void *addr, size_t size) { 164de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany if (!addr || !size) return; 165de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany int res = munmap(addr, size); 166de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany if (res != 0) { 167de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany Report("Failed to unmap\n"); 1680ecf5eb729dd81a43f8585cb438d3cb2a35899edKostya Serebryany AsanDie(); 169de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany } 170de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 171de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 172de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyint AsanOpenReadonly(const char* filename) { 173de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return open(filename, O_RDONLY); 174de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 175de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 1761e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenkoconst char *AsanGetEnv(const char *name) { 1771e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko char ***env_ptr = _NSGetEnviron(); 1781e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko CHECK(env_ptr); 1791e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko char **environ = *env_ptr; 1801e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko CHECK(environ); 1811e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko size_t name_len = internal_strlen(name); 1821e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko while (*environ != NULL) { 1831e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko size_t len = internal_strlen(*environ); 1841e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko if (len > name_len) { 1851e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko const char *p = *environ; 1861e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko if (!internal_memcmp(p, name, name_len) && 1871e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko p[name_len] == '=') { // Match. 1884dd8ba8238b1b698953628affe6e5b2edf3b3e3fAlexey Samsonov return *environ + name_len + 1; // String starting after =. 1891e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko } 1901e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko } 1911e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko environ++; 1921e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko } 1931e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko return NULL; 1941e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko} 1951e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko 1960ecf5eb729dd81a43f8585cb438d3cb2a35899edKostya Serebryanysize_t AsanRead(int fd, void *buf, size_t count) { 197de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return read(fd, buf, count); 198de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 199de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 200de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyint AsanClose(int fd) { 201de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return close(fd); 202de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 203de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 2048a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander PotapenkoAsanProcMaps::AsanProcMaps() { 2058a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko Reset(); 2068a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 2078a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 2088a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander PotapenkoAsanProcMaps::~AsanProcMaps() { 2098a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 2108a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 2113feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// More information about Mach-O headers can be found in mach-o/loader.h 2123feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Each Mach-O image has a header (mach_header or mach_header_64) starting with 2133feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// a magic number, and a list of linker load commands directly following the 2143feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// header. 2153feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// A load command is at least two 32-bit words: the command type and the 2163feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// command size in bytes. We're interested only in segment load commands 2173feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// (LC_SEGMENT and LC_SEGMENT_64), which tell that a part of the file is mapped 2183feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// into the task's address space. 2193feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// The |vmaddr|, |vmsize| and |fileoff| fields of segment_command or 2203feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// segment_command_64 correspond to the memory address, memory size and the 2213feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// file offset of the current memory segment. 2223feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Because these fields are taken from the images as is, one needs to add 2233feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// _dyld_get_image_vmaddr_slide() to get the actual addresses at runtime. 2243feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko 2258a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenkovoid AsanProcMaps::Reset() { 2268a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // Count down from the top. 2278a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // TODO(glider): as per man 3 dyld, iterating over the headers with 2283feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko // _dyld_image_count is thread-unsafe. We need to register callbacks for 2293feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko // adding and removing images which will invalidate the AsanProcMaps state. 2308a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko current_image_ = _dyld_image_count(); 2313feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_count_ = -1; 2323feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_addr_ = NULL; 233ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko current_magic_ = 0; 2343feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko} 2353feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko 2363feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Next and NextSegmentLoad were inspired by base/sysinfo.cc in 2373feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Google Perftools, http://code.google.com/p/google-perftools. 2383feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko 2393feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// NextSegmentLoad scans the current image for the next segment load command 2403feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// and returns the start and end addresses and file offset of the corresponding 2413feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// segment. 2423feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Note that the segment addresses are not necessarily sorted. 2433feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenkotemplate<uint32_t kLCSegment, typename SegmentCommand> 2443feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenkobool AsanProcMaps::NextSegmentLoad( 2453feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko uintptr_t *start, uintptr_t *end, uintptr_t *offset, 2463feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko char filename[], size_t filename_size) { 2473feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko const char* lc = current_load_cmd_addr_; 2483feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_addr_ += ((const load_command *)lc)->cmdsize; 2498a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (((const load_command *)lc)->cmd == kLCSegment) { 2503feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko const intptr_t dlloff = _dyld_get_image_vmaddr_slide(current_image_); 2518a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko const SegmentCommand* sc = (const SegmentCommand *)lc; 2528a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (start) *start = sc->vmaddr + dlloff; 2538a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (end) *end = sc->vmaddr + sc->vmsize + dlloff; 2548a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (offset) *offset = sc->fileoff; 2558a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (filename) { 25609672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov REAL(strncpy)(filename, _dyld_get_image_name(current_image_), 25709672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov filename_size); 2588a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 259ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko if (FLAG_v >= 4) 260ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko Report("LC_SEGMENT: %p--%p %s+%p\n", *start, *end, filename, *offset); 2618a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return true; 2628a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 2638a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return false; 2648a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 2658a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 2668a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenkobool AsanProcMaps::Next(uintptr_t *start, uintptr_t *end, 2678a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko uintptr_t *offset, char filename[], 2688a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko size_t filename_size) { 2698a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko for (; current_image_ >= 0; current_image_--) { 2708a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko const mach_header* hdr = _dyld_get_image_header(current_image_); 2718a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (!hdr) continue; 2723feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko if (current_load_cmd_count_ < 0) { 2733feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko // Set up for this image; 2743feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_count_ = hdr->ncmds; 275ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko current_magic_ = hdr->magic; 276ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko switch (current_magic_) { 2773feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko#ifdef MH_MAGIC_64 2783feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko case MH_MAGIC_64: { 2793feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header_64); 2803feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko break; 2813feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2823feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko#endif 2833feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko case MH_MAGIC: { 2843feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header); 2853feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko break; 2863feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2873feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko default: { 2883feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko continue; 2893feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2903feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2913feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2928a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 293ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko for (; current_load_cmd_count_ >= 0; current_load_cmd_count_--) { 294ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko switch (current_magic_) { 295ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko // current_magic_ may be only one of MH_MAGIC, MH_MAGIC_64. 2968a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#ifdef MH_MAGIC_64 297ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko case MH_MAGIC_64: { 298ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko if (NextSegmentLoad<LC_SEGMENT_64, struct segment_command_64>( 299ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko start, end, offset, filename, filename_size)) 300ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko return true; 301ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko break; 302ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko } 3038a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#endif 304ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko case MH_MAGIC: { 305ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko if (NextSegmentLoad<LC_SEGMENT, struct segment_command>( 306ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko start, end, offset, filename, filename_size)) 307ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko return true; 308ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko break; 309ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko } 310ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko } 3118a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 3128a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // If we get here, no more load_cmd's in this image talk about 3138a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // segments. Go on to the next image. 3148a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 3158a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return false; 3168a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 3178a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 3188a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenkobool AsanProcMaps::GetObjectNameAndOffset(uintptr_t addr, uintptr_t *offset, 3198a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko char filename[], 3208a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko size_t filename_size) { 3218a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return IterateForObjectNameAndOffset(addr, offset, filename, filename_size); 3228a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 3238a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 324c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryanyvoid AsanThread::SetThreadStackTopAndBottom() { 325c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany size_t stacksize = pthread_get_stacksize_np(pthread_self()); 326c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany void *stackaddr = pthread_get_stackaddr_np(pthread_self()); 327c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany stack_top_ = (uintptr_t)stackaddr; 328c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany stack_bottom_ = stack_top_ - stacksize; 329c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany int local; 330c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany CHECK(AddrIsInStack((uintptr_t)&local)); 331c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany} 332c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany 333d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya SerebryanyAsanLock::AsanLock(LinkerInitialized) { 334d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany // We assume that OS_SPINLOCK_INIT is zero 335d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany} 336d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 337d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryanyvoid AsanLock::Lock() { 338d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(sizeof(OSSpinLock) <= sizeof(opaque_storage_)); 339d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(OS_SPINLOCK_INIT == 0); 340d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(owner_ != (uintptr_t)pthread_self()); 341d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany OSSpinLockLock((OSSpinLock*)&opaque_storage_); 342d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(!owner_); 343d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany owner_ = (uintptr_t)pthread_self(); 344d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany} 345d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 346d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryanyvoid AsanLock::Unlock() { 347d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(owner_ == (uintptr_t)pthread_self()); 348d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany owner_ = 0; 349d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany OSSpinLockUnlock((OSSpinLock*)&opaque_storage_); 350d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany} 351d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 3529cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanovvoid AsanStackTrace::GetStackTrace(size_t max_s, uintptr_t pc, uintptr_t bp) { 3539cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov size = 0; 3549cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov trace[0] = pc; 3559cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov if ((max_s) > 1) { 3569cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov max_size = max_s; 3579cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov FastUnwindStack(pc, bp); 3589cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov } 3599cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov} 3609cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov 3615b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov// The range of pages to be used for escape islands. 3623281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko// TODO(glider): instead of mapping a fixed range we must find a range of 3633281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko// unmapped pages in vmmap and take them. 3641346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko// These constants were chosen empirically and may not work if the shadow 3651346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko// memory layout changes. Unfortunately they do necessarily depend on 3661346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko// kHighMemBeg or kHighMemEnd. 3675b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonovstatic void *island_allocator_pos = NULL; 3685b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov 3691346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko#if __WORDSIZE == 32 3705b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandEnd (0xffdf0000 - kPageSize) 3715b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandBeg (kIslandEnd - 256 * kPageSize) 3721346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko#else 3735b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandEnd (0x7fffffdf0000 - kPageSize) 3745b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandBeg (kIslandEnd - 256 * kPageSize) 3751346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko#endif 3763281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko 3773281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenkoextern "C" 3785b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonovmach_error_t __interception_allocate_island(void **ptr, 3795b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov size_t unused_size, 3805b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov void *unused_hint) { 3813281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko if (!island_allocator_pos) { 3821346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko island_allocator_pos = 3831346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko asan_mmap((void*)kIslandBeg, kIslandEnd - kIslandBeg, 3841346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko PROT_READ | PROT_WRITE | PROT_EXEC, 3851346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko MAP_PRIVATE | MAP_ANON | MAP_FIXED, 3861346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko -1, 0); 3871346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko if (island_allocator_pos != (void*)kIslandBeg) { 3883281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko return KERN_NO_SPACE; 3893281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko } 3903281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko }; 3913281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko *ptr = island_allocator_pos; 3923281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko island_allocator_pos = (char*)island_allocator_pos + kPageSize; 3933281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko return err_none; 3943281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko} 3953281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko 3963281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenkoextern "C" 3975b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonovmach_error_t __interception_deallocate_island(void *ptr) { 3983281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko // Do nothing. 3993281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko // TODO(glider): allow to free and reuse the island memory. 4003281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko return err_none; 4013281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko} 402d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 4031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Support for the following functions from libdispatch on Mac OS: 4041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_async_f() 4051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_async() 4061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_sync_f() 4071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_sync() 4081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_after_f() 4091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_after() 4101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_group_async_f() 4111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_group_async() 4121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// TODO(glider): libdispatch API contains other functions that we don't support 4131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// yet. 4141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 4151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_sync() and dispatch_sync_f() are synchronous, although chances are 4161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// they can cause jobs to run on a thread different from the current one. 4171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// TODO(glider): if so, we need a test for this (otherwise we should remove 4181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// them). 4191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 4201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The following functions use dispatch_barrier_async_f() (which isn't a library 4211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// function but is exported) and are thus supported: 4221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_cancel_handler_f() 4231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_cancel_handler() 4241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_event_handler_f() 4251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_event_handler() 4261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 4271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The reference manual for Grand Central Dispatch is available at 4281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// http://developer.apple.com/library/mac/#documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html 4291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The implementation details are at 4301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// http://libdispatch.macosforge.org/trac/browser/trunk/src/queue.c 4311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern "C" 4331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid asan_dispatch_call_block_and_release(void *block) { 4349cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 4351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *context = (asan_block_context_t*)block; 4361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 4371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("asan_dispatch_call_block_and_release(): " 4381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany "context: %p, pthread_self: %p\n", 4391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany block, pthread_self()); 4401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 4411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany AsanThread *t = asanThreadRegistry().GetCurrent(); 442af3441580555ceed092170232cd5f2cc180f19f4Kostya Serebryany if (!t) { 44355cdfc6c5af92560bc0623b5a0d70af71511c3c8Alexey Samsonov t = AsanThread::Create(context->parent_tid, NULL, NULL, &stack); 44455cdfc6c5af92560bc0623b5a0d70af71511c3c8Alexey Samsonov asanThreadRegistry().RegisterThread(t); 44569eca73ac96688c8bfe1f23ee006af29c7858c40Kostya Serebryany t->Init(); 4461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asanThreadRegistry().SetCurrent(t); 4471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 4481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // Call the original dispatcher for the block. 4491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany context->func(context->block); 4501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_free(context, &stack); 4511e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} // namespace __asan 4541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyusing namespace __asan; // NOLINT 4561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Wrap |ctxt| and |func| into an asan_block_context_t. 4581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The caller retains control of the allocated context. 4591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern "C" 4601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyasan_block_context_t *alloc_asan_context(void *ctxt, dispatch_function_t func, 4611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany AsanStackTrace *stack) { 4621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = 4631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany (asan_block_context_t*) asan_malloc(sizeof(asan_block_context_t), stack); 4641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->block = ctxt; 4651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->func = func; 4661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->parent_tid = asanThreadRegistry().GetCurrentTidOrMinusOne(); 4671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return asan_ctxt; 4681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// TODO(glider): can we reduce code duplication by introducing a macro? 471f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_async_f, dispatch_queue_t dq, void *ctxt, 472f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 4739cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 4741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 4751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 4761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_async_f(): context: %p, pthread_self: %p\n", 4771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 4781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 4791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 48009672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(dispatch_async_f)(dq, (void*)asan_ctxt, 48109672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 4821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 484f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_sync_f, dispatch_queue_t dq, void *ctxt, 485f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 4869cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 4871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 4881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 4891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_sync_f(): context: %p, pthread_self: %p\n", 4901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 4911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 4921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 49309672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(dispatch_sync_f)(dq, (void*)asan_ctxt, 49409672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 4951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 497f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_after_f, dispatch_time_t when, 498f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_queue_t dq, void *ctxt, 499f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 5009cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 5021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_after_f: %p\n", asan_ctxt); 5041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 50609672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(dispatch_after_f)(when, dq, (void*)asan_ctxt, 50709672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 5081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 510f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_barrier_async_f, dispatch_queue_t dq, void *ctxt, 511f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 5129cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 5141e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5151e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_barrier_async_f(): context: %p, pthread_self: %p\n", 5161e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 5171e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 51909672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov REAL(dispatch_barrier_async_f)(dq, (void*)asan_ctxt, 52009672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 5211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 523f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_group_async_f, dispatch_group_t group, 524f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_queue_t dq, void *ctxt, 525f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 5269cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5271e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 5281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5291e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_group_async_f(): context: %p, pthread_self: %p\n", 5301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 5311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 53309672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov REAL(dispatch_group_async_f)(group, dq, (void*)asan_ctxt, 53409672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 5351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5361e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The following stuff has been extremely helpful while looking for the 5381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// unhandled functions that spawned jobs on Chromium shutdown. If the verbosity 5391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// level is 2 or greater, we wrap pthread_workqueue_additem_np() in order to 5401e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// find the points of worker thread creation (each of such threads may be used 5411e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// to run several tasks, that's why this is not enough to support the whole 5421e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// libdispatch API. 5431e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern "C" 5441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid *wrap_workitem_func(void *arg) { 5451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("wrap_workitem_func: %p, pthread_self: %p\n", arg, pthread_self()); 5471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 5481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *ctxt = (asan_block_context_t*)arg; 5491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany worker_t fn = (worker_t)(ctxt->func); 5501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void *result = fn(ctxt->block); 5519cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_free(arg, &stack); 5531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return result; 5541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 556f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(int, pthread_workqueue_additem_np, pthread_workqueue_t workq, 5571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void *(*workitem_func)(void *), void * workitem_arg, 5581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany pthread_workitem_handle_t * itemhandlep, unsigned int *gencountp) { 5599cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = 5611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany (asan_block_context_t*) asan_malloc(sizeof(asan_block_context_t), &stack); 5621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->block = workitem_arg; 5631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->func = (dispatch_function_t)workitem_func; 5641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->parent_tid = asanThreadRegistry().GetCurrentTidOrMinusOne(); 5651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("pthread_workqueue_additem_np: %p\n", asan_ctxt); 5671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 56909672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(pthread_workqueue_additem_np)(workq, wrap_workitem_func, 57009672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_ctxt, itemhandlep, 57109672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov gencountp); 5721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 573d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany 574431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// CF_RC_BITS, the layout of CFRuntimeBase and __CFStrIsConstant are internal 575431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// and subject to change in further CoreFoundation versions. Apple does not 576431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// guarantee any binary compatibility from release to release. 577431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 578431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// See http://opensource.apple.com/source/CF/CF-635.15/CFInternal.h 579431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if defined(__BIG_ENDIAN__) 580431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#define CF_RC_BITS 0 581431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 582431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 583431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if defined(__LITTLE_ENDIAN__) 584431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#define CF_RC_BITS 3 585431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 586431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 587431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// See http://opensource.apple.com/source/CF/CF-635.15/CFRuntime.h 588431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenkotypedef struct __CFRuntimeBase { 589431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko uintptr_t _cfisa; 590431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko uint8_t _cfinfo[4]; 591431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if __LP64__ 592431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko uint32_t _rc; 593431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 594431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko} CFRuntimeBase; 595431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 596431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// See http://opensource.apple.com/source/CF/CF-635.15/CFString.c 597431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenkoint __CFStrIsConstant(CFStringRef str) { 598431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko CFRuntimeBase *base = (CFRuntimeBase*)str; 599431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if __LP64__ 600431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko return base->_rc == 0; 601431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#else 602431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko return (base->_cfinfo[CF_RC_BITS]) == 0; 603431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 604431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko} 605431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 606f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(CFStringRef, CFStringCreateCopy, CFAllocatorRef alloc, 607f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov CFStringRef str) { 608431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko if (__CFStrIsConstant(str)) { 609431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko return str; 610431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko } else { 61109672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(CFStringCreateCopy)(alloc, str); 612431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko } 613431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko} 614431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 61564ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonovnamespace __asan { 61664ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonovvoid PatchCFStringCreateCopy() { 61764ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Normally CFStringCreateCopy should not copy constant CF strings. 61864ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Replacing the default CFAllocator causes constant strings to be copied 61964ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // rather than just returned, which leads to bugs in big applications like 62064ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Chromium and WebKit, see 62164ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // http://code.google.com/p/address-sanitizer/issues/detail?id=10 62264ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Until this problem is fixed we need to check that the string is 62364ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // non-constant before calling CFStringCreateCopy. 62464ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov CHECK(INTERCEPT_FUNCTION(CFStringCreateCopy)); 62564ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov} 62664ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov} // namespace __asan 62764ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov 628d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany#endif // __APPLE__ 629