asan_mac.cc revision 3f4c3875c42078e22c7e5356c5746fd18756d958
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 1764ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov#include "asan_interceptors.h" 181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_internal.h" 19895b3872acb5bcccb1769ea69d37dd33c722f99dAlexander Potapenko#include "asan_mapping.h" 208a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#include "asan_procmaps.h" 211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_stack.h" 221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_thread.h" 231e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include "asan_thread_registry.h" 241e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 251e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko#include <crt_externs.h> // for _NSGetEnviron 268a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#include <mach-o/dyld.h> 279b993e8cd0f8964782ee93524603d0c53adc2249Kostya Serebryany#include <mach-o/loader.h> 281e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <sys/mman.h> 29ef14ff6512d7b2e20aa3206dff820b5f90285420Kostya Serebryany#include <sys/resource.h> 3059dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko#include <sys/sysctl.h> 319107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany#include <sys/ucontext.h> 32c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany#include <pthread.h> 33a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany#include <fcntl.h> 341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany#include <unistd.h> 35d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany#include <libkern/OSAtomic.h> 3664ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov#include <CoreFoundation/CFString.h> 371e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanynamespace __asan { 391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 403f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryanyvoid GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 419107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany ucontext_t *ucontext = (ucontext_t*)context; 429107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany# if __WORDSIZE == 64 439107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *pc = ucontext->uc_mcontext->__ss.__rip; 449107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *bp = ucontext->uc_mcontext->__ss.__rbp; 459107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *sp = ucontext->uc_mcontext->__ss.__rsp; 469107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany# else 479107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *pc = ucontext->uc_mcontext->__ss.__eip; 489107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *bp = ucontext->uc_mcontext->__ss.__ebp; 499107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany *sp = ucontext->uc_mcontext->__ss.__esp; 509107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany# endif // __WORDSIZE 519107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany} 529107c26bd88fc9cf44a2cd7d6967eb830ac63be3Kostya Serebryany 5338dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonovenum { 5438dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_UNKNOWN = 0, 5538dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_LEOPARD, 5638dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_SNOW_LEOPARD, 5738dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov MACOS_VERSION_LION, 5838dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov}; 5938dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov 6038dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonovstatic int GetMacosVersion() { 6159dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko int mib[2] = { CTL_KERN, KERN_OSRELEASE }; 6259dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko char version[100]; 6359dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko size_t len = 0, maxlen = sizeof(version) / sizeof(version[0]); 6459dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko for (int i = 0; i < maxlen; i++) version[i] = '\0'; 6559dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko // Get the version length. 663f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany CHECK(sysctl(mib, 2, 0, &len, 0, 0) != -1); 6759dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko CHECK(len < maxlen); 683f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany CHECK(sysctl(mib, 2, version, &len, 0, 0) != -1); 6959dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko switch (version[0]) { 7059dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '9': return MACOS_VERSION_LEOPARD; 7159dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '1': { 7259dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko switch (version[1]) { 7359dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '0': return MACOS_VERSION_SNOW_LEOPARD; 7459dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko case '1': return MACOS_VERSION_LION; 7559dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko default: return MACOS_VERSION_UNKNOWN; 7659dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko } 7759dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko } 7859dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko default: return MACOS_VERSION_UNKNOWN; 7959dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko } 8059dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko} 8159dc578df0de177b44c8c78f69d73735e38e5c14Alexander Potapenko 8238dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonovbool PlatformHasDifferentMemcpyAndMemmove() { 8338dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // On OS X 10.7 memcpy() and memmove() are both resolved 8438dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // into memmove$VARIANT$sse42. 8538dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // See also http://code.google.com/p/address-sanitizer/issues/detail?id=34. 8638dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // TODO(glider): need to check dynamically that memcpy() and memmove() are 8738dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov // actually the same function. 8838dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov return GetMacosVersion() == MACOS_VERSION_SNOW_LEOPARD; 8938dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov} 9038dd4ed885e714c376466f6fe0d69f5f22d37014Alexey Samsonov 911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// No-op. Mac does not support static linkage anyway. 921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid *AsanDoesNotSupportStaticLinkage() { 933f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany return 0; 941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 964803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryanybool AsanInterceptsSignal(int signum) { 974803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryany return (signum == SIGSEGV || signum == SIGBUS) && FLAG_handle_segv; 984803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryany} 994803ab90ead451b55a5833f0fd38b10fd1fc83ebKostya Serebryany 100a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryanystatic void *asan_mmap(void *addr, size_t length, int prot, int flags, 1011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany int fd, uint64_t offset) { 1021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return mmap(addr, length, prot, flags, fd, offset); 1031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 1050ecf5eb729dd81a43f8585cb438d3cb2a35899edKostya Serebryanysize_t AsanWrite(int fd, const void *buf, size_t count) { 1061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return write(fd, buf, count); 1071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 1081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 109de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyvoid *AsanMmapSomewhereOrDie(size_t size, const char *mem_type) { 110de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany size = RoundUpTo(size, kPageSize); 111de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany void *res = asan_mmap(0, size, 112de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany PROT_READ | PROT_WRITE, 113de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany MAP_PRIVATE | MAP_ANON, -1, 0); 114de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany if (res == (void*)-1) { 115de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany OutOfMemoryMessageAndDie(mem_type, size); 116de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany } 117de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return res; 118de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 119de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 1203f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryanyvoid *AsanMmapFixedNoReserve(uptr fixed_addr, size_t size) { 121a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany return asan_mmap((void*)fixed_addr, size, 122a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany PROT_READ | PROT_WRITE, 123a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, 124a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 0, 0); 125a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany} 126a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 1273f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryanyvoid *AsanMprotect(uptr fixed_addr, size_t size) { 128a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany return asan_mmap((void*)fixed_addr, size, 129a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany PROT_NONE, 130a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, 131a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 0, 0); 132a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany} 133a874fe5b5d67152e4e737498d532eec80940bdcdKostya Serebryany 134de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyvoid AsanUnmapOrDie(void *addr, size_t size) { 135de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany if (!addr || !size) return; 136de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany int res = munmap(addr, size); 137de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany if (res != 0) { 138de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany Report("Failed to unmap\n"); 1390ecf5eb729dd81a43f8585cb438d3cb2a35899edKostya Serebryany AsanDie(); 140de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany } 141de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 142de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 143de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyint AsanOpenReadonly(const char* filename) { 144de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return open(filename, O_RDONLY); 145de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 146de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 1471e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenkoconst char *AsanGetEnv(const char *name) { 1481e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko char ***env_ptr = _NSGetEnviron(); 1491e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko CHECK(env_ptr); 1501e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko char **environ = *env_ptr; 1511e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko CHECK(environ); 1521e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko size_t name_len = internal_strlen(name); 1533f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany while (*environ != 0) { 1541e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko size_t len = internal_strlen(*environ); 1551e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko if (len > name_len) { 1561e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko const char *p = *environ; 1571e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko if (!internal_memcmp(p, name, name_len) && 1581e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko p[name_len] == '=') { // Match. 1594dd8ba8238b1b698953628affe6e5b2edf3b3e3fAlexey Samsonov return *environ + name_len + 1; // String starting after =. 1601e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko } 1611e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko } 1621e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko environ++; 1631e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko } 1643f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany return 0; 1651e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko} 1661e316d7f488a75312539629e9d937e156280eeb6Alexander Potapenko 1670ecf5eb729dd81a43f8585cb438d3cb2a35899edKostya Serebryanysize_t AsanRead(int fd, void *buf, size_t count) { 168de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return read(fd, buf, count); 169de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 170de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 171de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryanyint AsanClose(int fd) { 172de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany return close(fd); 173de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany} 174de496f451bce322b6cde100456591f1f50ab3477Kostya Serebryany 1758a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander PotapenkoAsanProcMaps::AsanProcMaps() { 1768a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko Reset(); 1778a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 1788a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 1798a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander PotapenkoAsanProcMaps::~AsanProcMaps() { 1808a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 1818a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 1823feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// More information about Mach-O headers can be found in mach-o/loader.h 1833feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Each Mach-O image has a header (mach_header or mach_header_64) starting with 1843feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// a magic number, and a list of linker load commands directly following the 1853feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// header. 1863feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// A load command is at least two 32-bit words: the command type and the 1873feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// command size in bytes. We're interested only in segment load commands 1883feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// (LC_SEGMENT and LC_SEGMENT_64), which tell that a part of the file is mapped 1893feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// into the task's address space. 1903feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// The |vmaddr|, |vmsize| and |fileoff| fields of segment_command or 1913feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// segment_command_64 correspond to the memory address, memory size and the 1923feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// file offset of the current memory segment. 1933feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Because these fields are taken from the images as is, one needs to add 1943feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// _dyld_get_image_vmaddr_slide() to get the actual addresses at runtime. 1953feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko 1968a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenkovoid AsanProcMaps::Reset() { 1978a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // Count down from the top. 1988a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // TODO(glider): as per man 3 dyld, iterating over the headers with 1993feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko // _dyld_image_count is thread-unsafe. We need to register callbacks for 2003feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko // adding and removing images which will invalidate the AsanProcMaps state. 2018a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko current_image_ = _dyld_image_count(); 2023feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_count_ = -1; 2033f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany current_load_cmd_addr_ = 0; 204ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko current_magic_ = 0; 2053feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko} 2063feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko 2073feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Next and NextSegmentLoad were inspired by base/sysinfo.cc in 2083feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Google Perftools, http://code.google.com/p/google-perftools. 2093feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko 2103feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// NextSegmentLoad scans the current image for the next segment load command 2113feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// and returns the start and end addresses and file offset of the corresponding 2123feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// segment. 2133feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko// Note that the segment addresses are not necessarily sorted. 2143feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenkotemplate<uint32_t kLCSegment, typename SegmentCommand> 2153feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenkobool AsanProcMaps::NextSegmentLoad( 2163f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany uptr *start, uptr *end, uptr *offset, 2173feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko char filename[], size_t filename_size) { 2183feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko const char* lc = current_load_cmd_addr_; 2193feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_addr_ += ((const load_command *)lc)->cmdsize; 2208a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (((const load_command *)lc)->cmd == kLCSegment) { 2213feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko const intptr_t dlloff = _dyld_get_image_vmaddr_slide(current_image_); 2228a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko const SegmentCommand* sc = (const SegmentCommand *)lc; 2238a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (start) *start = sc->vmaddr + dlloff; 2248a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (end) *end = sc->vmaddr + sc->vmsize + dlloff; 2258a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (offset) *offset = sc->fileoff; 2268a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (filename) { 22709672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov REAL(strncpy)(filename, _dyld_get_image_name(current_image_), 22809672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov filename_size); 2298a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 230ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko if (FLAG_v >= 4) 231ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko Report("LC_SEGMENT: %p--%p %s+%p\n", *start, *end, filename, *offset); 2328a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return true; 2338a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 2348a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return false; 2358a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 2368a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 2373f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryanybool AsanProcMaps::Next(uptr *start, uptr *end, 2383f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany uptr *offset, char filename[], 2398a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko size_t filename_size) { 2408a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko for (; current_image_ >= 0; current_image_--) { 2418a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko const mach_header* hdr = _dyld_get_image_header(current_image_); 2428a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko if (!hdr) continue; 2433feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko if (current_load_cmd_count_ < 0) { 2443feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko // Set up for this image; 2453feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_count_ = hdr->ncmds; 246ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko current_magic_ = hdr->magic; 247ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko switch (current_magic_) { 2483feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko#ifdef MH_MAGIC_64 2493feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko case MH_MAGIC_64: { 2503feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header_64); 2513feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko break; 2523feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2533feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko#endif 2543feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko case MH_MAGIC: { 2553feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header); 2563feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko break; 2573feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2583feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko default: { 2593feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko continue; 2603feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2613feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2623feef82eab6d5f0ace384a670bfb5988e0c165a0Alexander Potapenko } 2638a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 264ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko for (; current_load_cmd_count_ >= 0; current_load_cmd_count_--) { 265ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko switch (current_magic_) { 266ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko // current_magic_ may be only one of MH_MAGIC, MH_MAGIC_64. 2678a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#ifdef MH_MAGIC_64 268ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko case MH_MAGIC_64: { 269ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko if (NextSegmentLoad<LC_SEGMENT_64, struct segment_command_64>( 270ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko start, end, offset, filename, filename_size)) 271ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko return true; 272ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko break; 273ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko } 2748a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko#endif 275ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko case MH_MAGIC: { 276ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko if (NextSegmentLoad<LC_SEGMENT, struct segment_command>( 277ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko start, end, offset, filename, filename_size)) 278ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko return true; 279ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko break; 280ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko } 281ddf50a3e7a28c2ab12243e72b35ccf8c04f15b49Alexander Potapenko } 2828a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 2838a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // If we get here, no more load_cmd's in this image talk about 2848a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko // segments. Go on to the next image. 2858a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko } 2868a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return false; 2878a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 2888a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 2893f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryanybool AsanProcMaps::GetObjectNameAndOffset(uptr addr, uptr *offset, 2908a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko char filename[], 2918a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko size_t filename_size) { 2928a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko return IterateForObjectNameAndOffset(addr, offset, filename, filename_size); 2938a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko} 2948a34d384255f9bf4c2a9b03a4df81b9af57124d8Alexander Potapenko 295c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryanyvoid AsanThread::SetThreadStackTopAndBottom() { 296c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany size_t stacksize = pthread_get_stacksize_np(pthread_self()); 297c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany void *stackaddr = pthread_get_stackaddr_np(pthread_self()); 2983f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany stack_top_ = (uptr)stackaddr; 299c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany stack_bottom_ = stack_top_ - stacksize; 300c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany int local; 3013f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany CHECK(AddrIsInStack((uptr)&local)); 302c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany} 303c549dd7b5fa5fb97270f57067797224cee0429f2Kostya Serebryany 304d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya SerebryanyAsanLock::AsanLock(LinkerInitialized) { 305d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany // We assume that OS_SPINLOCK_INIT is zero 306d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany} 307d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 308d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryanyvoid AsanLock::Lock() { 309d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(sizeof(OSSpinLock) <= sizeof(opaque_storage_)); 310d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(OS_SPINLOCK_INIT == 0); 3113f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany CHECK(owner_ != (uptr)pthread_self()); 312d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany OSSpinLockLock((OSSpinLock*)&opaque_storage_); 313d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany CHECK(!owner_); 3143f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany owner_ = (uptr)pthread_self(); 315d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany} 316d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 317d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryanyvoid AsanLock::Unlock() { 3183f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany CHECK(owner_ == (uptr)pthread_self()); 319d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany owner_ = 0; 320d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany OSSpinLockUnlock((OSSpinLock*)&opaque_storage_); 321d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany} 322d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 3233f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryanyvoid AsanStackTrace::GetStackTrace(size_t max_s, uptr pc, uptr bp) { 3249cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov size = 0; 3259cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov trace[0] = pc; 3269cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov if ((max_s) > 1) { 3279cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov max_size = max_s; 3289cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov FastUnwindStack(pc, bp); 3299cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov } 3309cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov} 3319cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov 3325b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov// The range of pages to be used for escape islands. 3333281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko// TODO(glider): instead of mapping a fixed range we must find a range of 3343281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko// unmapped pages in vmmap and take them. 3351346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko// These constants were chosen empirically and may not work if the shadow 3361346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko// memory layout changes. Unfortunately they do necessarily depend on 3371346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko// kHighMemBeg or kHighMemEnd. 3383f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryanystatic void *island_allocator_pos = 0; 3395b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov 3401346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko#if __WORDSIZE == 32 3415b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandEnd (0xffdf0000 - kPageSize) 3425b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandBeg (kIslandEnd - 256 * kPageSize) 3431346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko#else 3445b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandEnd (0x7fffffdf0000 - kPageSize) 3455b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov# define kIslandBeg (kIslandEnd - 256 * kPageSize) 3461346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko#endif 3473281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko 3483281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenkoextern "C" 3495b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonovmach_error_t __interception_allocate_island(void **ptr, 3505b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov size_t unused_size, 3515b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonov void *unused_hint) { 3523281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko if (!island_allocator_pos) { 3531346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko island_allocator_pos = 3541346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko asan_mmap((void*)kIslandBeg, kIslandEnd - kIslandBeg, 3551346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko PROT_READ | PROT_WRITE | PROT_EXEC, 3561346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko MAP_PRIVATE | MAP_ANON | MAP_FIXED, 3571346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko -1, 0); 3581346ced2eb8d10305e8d98496d9006cfbbad1548Alexander Potapenko if (island_allocator_pos != (void*)kIslandBeg) { 3593281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko return KERN_NO_SPACE; 3603281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko } 361ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko if (FLAG_v) { 362ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko Report("Mapped pages %p--%p for branch islands.\n", 363ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko kIslandBeg, kIslandEnd); 364ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko } 365ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko // Should not be very performance-critical. 366ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko internal_memset(island_allocator_pos, 0xCC, kIslandEnd - kIslandBeg); 3673281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko }; 3683281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko *ptr = island_allocator_pos; 3693281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko island_allocator_pos = (char*)island_allocator_pos + kPageSize; 370ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko if (FLAG_v) { 371ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko Report("Branch island allocated at %p\n", *ptr); 372ebb9702cff96192c6a6ea963037929ca7ed60eaeAlexander Potapenko } 3733281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko return err_none; 3743281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko} 3753281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko 3763281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenkoextern "C" 3775b29018cf422e7711fb760b733c32127397a43fcAlexey Samsonovmach_error_t __interception_deallocate_island(void *ptr) { 3783281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko // Do nothing. 3793281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko // TODO(glider): allow to free and reuse the island memory. 3803281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko return err_none; 3813281209790b5e543c79acb2f5008d1df77fb76d9Alexander Potapenko} 382d55f5f8c413622db4bd28b5cca9bfeb4d61564e0Kostya Serebryany 3831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Support for the following functions from libdispatch on Mac OS: 3841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_async_f() 3851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_async() 3861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_sync_f() 3871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_sync() 3881e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_after_f() 3891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_after() 3901e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_group_async_f() 3911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_group_async() 3921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// TODO(glider): libdispatch API contains other functions that we don't support 3931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// yet. 3941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 3951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_sync() and dispatch_sync_f() are synchronous, although chances are 3961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// they can cause jobs to run on a thread different from the current one. 3971e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// TODO(glider): if so, we need a test for this (otherwise we should remove 3981e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// them). 3991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 4001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The following functions use dispatch_barrier_async_f() (which isn't a library 4011e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// function but is exported) and are thus supported: 4021e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_cancel_handler_f() 4031e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_cancel_handler() 4041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_event_handler_f() 4051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// dispatch_source_set_event_handler() 4061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// 4071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The reference manual for Grand Central Dispatch is available at 4081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// http://developer.apple.com/library/mac/#documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html 4091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The implementation details are at 4101e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// http://libdispatch.macosforge.org/trac/browser/trunk/src/queue.c 4111e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4125cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonovtypedef void* pthread_workqueue_t; 4135cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonovtypedef void* pthread_workitem_handle_t; 414f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov 415f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovtypedef void* dispatch_group_t; 416f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovtypedef void* dispatch_queue_t; 417f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovtypedef uint64_t dispatch_time_t; 418f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovtypedef void (*dispatch_function_t)(void *block); 4195cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonovtypedef void* (*worker_t)(void *block); 4205cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov 4215cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov// A wrapper for the ObjC blocks used to support libdispatch. 4225cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonovtypedef struct { 4235cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov void *block; 4245cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov dispatch_function_t func; 4255cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov int parent_tid; 4265cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov} asan_block_context_t; 4275cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov 428f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov// We use extern declarations of libdispatch functions here instead 429f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov// of including <dispatch/dispatch.h>. This header is not present on 430f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov// Mac OS X Leopard and eariler, and although we don't expect ASan to 431f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov// work on legacy systems, it's bad to break the build of 432f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov// LLVM compiler-rt there. 4335cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonovextern "C" { 434f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovvoid dispatch_async_f(dispatch_queue_t dq, void *ctxt, 435f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov dispatch_function_t func); 436f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovvoid dispatch_sync_f(dispatch_queue_t dq, void *ctxt, 437f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov dispatch_function_t func); 438f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovvoid dispatch_after_f(dispatch_time_t when, dispatch_queue_t dq, void *ctxt, 439f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov dispatch_function_t func); 4405cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonovvoid dispatch_barrier_async_f(dispatch_queue_t dq, void *ctxt, 4415cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov dispatch_function_t func); 442f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonovvoid dispatch_group_async_f(dispatch_group_t group, dispatch_queue_t dq, 443f7ceaad2919d2e26e9edea29232bc9dd8f145c42Alexey Samsonov void *ctxt, dispatch_function_t func); 4445cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonovint pthread_workqueue_additem_np(pthread_workqueue_t workq, 4455cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov void *(*workitem_func)(void *), void * workitem_arg, 4465cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov pthread_workitem_handle_t * itemhandlep, unsigned int *gencountp); 4475cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov} // extern "C" 4485cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov 4491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern "C" 4501e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid asan_dispatch_call_block_and_release(void *block) { 4519cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 4521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *context = (asan_block_context_t*)block; 4531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 4541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("asan_dispatch_call_block_and_release(): " 4551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany "context: %p, pthread_self: %p\n", 4561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany block, pthread_self()); 4571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 4581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany AsanThread *t = asanThreadRegistry().GetCurrent(); 459af3441580555ceed092170232cd5f2cc180f19f4Kostya Serebryany if (!t) { 4603f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany t = AsanThread::Create(context->parent_tid, 0, 0, &stack); 46155cdfc6c5af92560bc0623b5a0d70af71511c3c8Alexey Samsonov asanThreadRegistry().RegisterThread(t); 46269eca73ac96688c8bfe1f23ee006af29c7858c40Kostya Serebryany t->Init(); 4631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asanThreadRegistry().SetCurrent(t); 4641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 4651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany // Call the original dispatcher for the block. 4661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany context->func(context->block); 4671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_free(context, &stack); 4681e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} // namespace __asan 4711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyusing namespace __asan; // NOLINT 4731e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// Wrap |ctxt| and |func| into an asan_block_context_t. 4751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The caller retains control of the allocated context. 4761e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern "C" 4771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyasan_block_context_t *alloc_asan_context(void *ctxt, dispatch_function_t func, 4781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany AsanStackTrace *stack) { 4791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = 4801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany (asan_block_context_t*) asan_malloc(sizeof(asan_block_context_t), stack); 4811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->block = ctxt; 4821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->func = func; 4831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->parent_tid = asanThreadRegistry().GetCurrentTidOrMinusOne(); 4841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return asan_ctxt; 4851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 4861e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 4871e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// TODO(glider): can we reduce code duplication by introducing a macro? 488f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_async_f, dispatch_queue_t dq, void *ctxt, 489f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 4909cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 4911e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 4921e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 4931e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_async_f(): context: %p, pthread_self: %p\n", 4941e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 4951e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 4961e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 49709672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(dispatch_async_f)(dq, (void*)asan_ctxt, 49809672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 4991e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5001e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 501f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_sync_f, dispatch_queue_t dq, void *ctxt, 502f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 5039cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5041e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 5051e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5061e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_sync_f(): context: %p, pthread_self: %p\n", 5071e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 5081e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5091e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 51009672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(dispatch_sync_f)(dq, (void*)asan_ctxt, 51109672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 5121e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5131e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 514f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_after_f, dispatch_time_t when, 515f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_queue_t dq, void *ctxt, 516f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 5179cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5181e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 5191e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5201e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_after_f: %p\n", asan_ctxt); 5211e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5221e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 52309672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(dispatch_after_f)(when, dq, (void*)asan_ctxt, 52409672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 5251e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5261e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 527f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_barrier_async_f, dispatch_queue_t dq, void *ctxt, 528f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 5299cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5301e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 5311e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5321e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_barrier_async_f(): context: %p, pthread_self: %p\n", 5331e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 5341e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5351e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 53609672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov REAL(dispatch_barrier_async_f)(dq, (void*)asan_ctxt, 53709672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 5381e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5391e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 540f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(void, dispatch_group_async_f, dispatch_group_t group, 541f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_queue_t dq, void *ctxt, 542f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov dispatch_function_t func) { 5439cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5441e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); 5451e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5461e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("dispatch_group_async_f(): context: %p, pthread_self: %p\n", 5471e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt, pthread_self()); 5481e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5491e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 55009672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov REAL(dispatch_group_async_f)(group, dq, (void*)asan_ctxt, 55109672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_dispatch_call_block_and_release); 5521e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5531e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 5541e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// The following stuff has been extremely helpful while looking for the 5551e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// unhandled functions that spawned jobs on Chromium shutdown. If the verbosity 5561e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// level is 2 or greater, we wrap pthread_workqueue_additem_np() in order to 5571e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// find the points of worker thread creation (each of such threads may be used 5581e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// to run several tasks, that's why this is not enough to support the whole 5591e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany// libdispatch API. 5601e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyextern "C" 5611e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryanyvoid *wrap_workitem_func(void *arg) { 5621e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5631e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("wrap_workitem_func: %p, pthread_self: %p\n", arg, pthread_self()); 5641e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 5651e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *ctxt = (asan_block_context_t*)arg; 5661e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany worker_t fn = (worker_t)(ctxt->func); 5671e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void *result = fn(ctxt->block); 5689cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5691e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_free(arg, &stack); 5701e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany return result; 5711e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 5721e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany 573f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(int, pthread_workqueue_additem_np, pthread_workqueue_t workq, 5741e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany void *(*workitem_func)(void *), void * workitem_arg, 5751e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany pthread_workitem_handle_t * itemhandlep, unsigned int *gencountp) { 5769cfa194cc62026fc7c6e82f7303eee8ad4d10cf4Evgeniy Stepanov GET_STACK_TRACE_HERE(kStackTraceMax); 5771e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_block_context_t *asan_ctxt = 5781e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany (asan_block_context_t*) asan_malloc(sizeof(asan_block_context_t), &stack); 5791e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->block = workitem_arg; 5801e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->func = (dispatch_function_t)workitem_func; 5811e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany asan_ctxt->parent_tid = asanThreadRegistry().GetCurrentTidOrMinusOne(); 5821e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany if (FLAG_v >= 2) { 5831e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany Report("pthread_workqueue_additem_np: %p\n", asan_ctxt); 5841e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany PRINT_CURRENT_STACK(); 5851e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany } 58609672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(pthread_workqueue_additem_np)(workq, wrap_workitem_func, 58709672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov asan_ctxt, itemhandlep, 58809672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov gencountp); 5891e172b4bdec57329bf904f063a29f99cddf2d85fKostya Serebryany} 590d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany 591431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// CF_RC_BITS, the layout of CFRuntimeBase and __CFStrIsConstant are internal 592431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// and subject to change in further CoreFoundation versions. Apple does not 593431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// guarantee any binary compatibility from release to release. 594431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 595431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// See http://opensource.apple.com/source/CF/CF-635.15/CFInternal.h 596431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if defined(__BIG_ENDIAN__) 597431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#define CF_RC_BITS 0 598431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 599431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 600431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if defined(__LITTLE_ENDIAN__) 601431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#define CF_RC_BITS 3 602431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 603431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 604431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// See http://opensource.apple.com/source/CF/CF-635.15/CFRuntime.h 605431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenkotypedef struct __CFRuntimeBase { 6063f4c3875c42078e22c7e5356c5746fd18756d958Kostya Serebryany uptr _cfisa; 607431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko uint8_t _cfinfo[4]; 608431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if __LP64__ 609431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko uint32_t _rc; 610431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 611431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko} CFRuntimeBase; 612431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 613431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko// See http://opensource.apple.com/source/CF/CF-635.15/CFString.c 614431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenkoint __CFStrIsConstant(CFStringRef str) { 615431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko CFRuntimeBase *base = (CFRuntimeBase*)str; 616431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#if __LP64__ 617431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko return base->_rc == 0; 618431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#else 619431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko return (base->_cfinfo[CF_RC_BITS]) == 0; 620431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko#endif 621431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko} 622431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 623f2598fc21bf651d23feab396a7581d48c01c3be5Alexey SamsonovINTERCEPTOR(CFStringRef, CFStringCreateCopy, CFAllocatorRef alloc, 624f2598fc21bf651d23feab396a7581d48c01c3be5Alexey Samsonov CFStringRef str) { 625431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko if (__CFStrIsConstant(str)) { 626431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko return str; 627431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko } else { 62809672caefb5694f1981a1712fdefa44840a95e67Alexey Samsonov return REAL(CFStringCreateCopy)(alloc, str); 629431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko } 630431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko} 631431e51782d62d1257348e41e24da6b544fe70507Alexander Potapenko 63264ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonovnamespace __asan { 633beba6448539095b67cab266d09cd7b7d313b8c3dAlexey Samsonov 634beba6448539095b67cab266d09cd7b7d313b8c3dAlexey Samsonovvoid InitializeMacInterceptors() { 6355cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov CHECK(INTERCEPT_FUNCTION(dispatch_async_f)); 6365cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov CHECK(INTERCEPT_FUNCTION(dispatch_sync_f)); 6375cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov CHECK(INTERCEPT_FUNCTION(dispatch_after_f)); 6385cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov CHECK(INTERCEPT_FUNCTION(dispatch_barrier_async_f)); 6395cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov CHECK(INTERCEPT_FUNCTION(dispatch_group_async_f)); 6405cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov // We don't need to intercept pthread_workqueue_additem_np() to support the 6415cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov // libdispatch API, but it helps us to debug the unsupported functions. Let's 6425cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov // intercept it only during verbose runs. 6435cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov if (FLAG_v >= 2) { 6445cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov CHECK(INTERCEPT_FUNCTION(pthread_workqueue_additem_np)); 6455cf832dc0a6566ae4bb8d48b1f41da623d2c2c1aAlexey Samsonov } 64664ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Normally CFStringCreateCopy should not copy constant CF strings. 64764ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Replacing the default CFAllocator causes constant strings to be copied 64864ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // rather than just returned, which leads to bugs in big applications like 64964ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Chromium and WebKit, see 65064ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // http://code.google.com/p/address-sanitizer/issues/detail?id=10 65164ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // Until this problem is fixed we need to check that the string is 65264ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov // non-constant before calling CFStringCreateCopy. 65364ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov CHECK(INTERCEPT_FUNCTION(CFStringCreateCopy)); 65464ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov} 655beba6448539095b67cab266d09cd7b7d313b8c3dAlexey Samsonov 65664ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov} // namespace __asan 65764ce2db7c838cd95315f7a4428e8a628eaa3e2fcAlexey Samsonov 658d6567c5166412f6acdde851e767c26f332d51d3dKostya Serebryany#endif // __APPLE__ 659