asan_report.cc revision 3c80c6c574850106481f82b9e23d1c728458d4a9
1bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev//===-- asan_report.cc ----------------------------------------------------===// 2bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// 3bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// The LLVM Compiler Infrastructure 4bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// 5bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// This file is distributed under the University of Illinois Open Source 6bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// License. See LICENSE.TXT for details. 7bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// 8bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev//===----------------------------------------------------------------------===// 9bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// 10bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// This file is a part of AddressSanitizer, an address sanity checker. 11bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// 12bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// This file contains error reporting code. 13bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev//===----------------------------------------------------------------------===// 14bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "asan_flags.h" 15bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "asan_internal.h" 16bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "asan_mapping.h" 17bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "asan_report.h" 18bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "asan_stack.h" 19bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "asan_thread.h" 20bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "sanitizer_common/sanitizer_common.h" 21bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "sanitizer_common/sanitizer_flags.h" 22bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "sanitizer_common/sanitizer_report_decorator.h" 23bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#include "sanitizer_common/sanitizer_symbolizer.h" 24bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 25bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevnamespace __asan { 26bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 27bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// -------------------- User-specified callbacks ----------------- {{{1 28bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void (*error_report_callback)(const char*); 29bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic char *error_message_buffer = 0; 30bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic uptr error_message_buffer_pos = 0; 31bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic uptr error_message_buffer_size = 0; 32bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 33bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid AppendToErrorMessageBuffer(const char *buffer) { 34bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (error_message_buffer) { 35bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr length = internal_strlen(buffer); 36bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK_GE(error_message_buffer_size, error_message_buffer_pos); 37bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr remaining = error_message_buffer_size - error_message_buffer_pos; 38bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev internal_strncpy(error_message_buffer + error_message_buffer_pos, 39bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev buffer, remaining); 40bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev error_message_buffer[error_message_buffer_size - 1] = '\0'; 41bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // FIXME: reallocate the buffer instead of truncating the message. 42bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev error_message_buffer_pos += remaining > length ? length : remaining; 43bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 44bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 45bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 46bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// ---------------------- Decorator ------------------------------ {{{1 47bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevbool PrintsToTtyCached() { 48bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static int cached = 0; 49bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static bool prints_to_tty; 50bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (!cached) { // Ok wrt threads since we are printing only from one thread. 51bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev prints_to_tty = PrintsToTty(); 52bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev cached = 1; 53bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 54bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return prints_to_tty; 55bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 56bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevclass Decorator: private __sanitizer::AnsiColorDecorator { 57bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev public: 58bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator() : __sanitizer::AnsiColorDecorator(PrintsToTtyCached()) { } 59bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *Warning() { return Red(); } 60bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *EndWarning() { return Default(); } 61bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *Access() { return Blue(); } 62bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *EndAccess() { return Default(); } 63bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *Location() { return Green(); } 64bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *EndLocation() { return Default(); } 65bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *Allocation() { return Magenta(); } 66bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *EndAllocation() { return Default(); } 67bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 68bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *ShadowByte(u8 byte) { 69bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev switch (byte) { 70bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanHeapLeftRedzoneMagic: 71bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanHeapRightRedzoneMagic: 72bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Red(); 73bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanHeapFreeMagic: 74bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Magenta(); 75bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackLeftRedzoneMagic: 76bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackMidRedzoneMagic: 77bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackRightRedzoneMagic: 78bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackPartialRedzoneMagic: 79bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Red(); 80bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackAfterReturnMagic: 81bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Magenta(); 82bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanInitializationOrderMagic: 83bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Cyan(); 84bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanUserPoisonedMemoryMagic: 85bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Blue(); 86bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackUseAfterScopeMagic: 87bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Magenta(); 88bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanGlobalRedzoneMagic: 89bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Red(); 90bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanInternalHeapMagic: 91bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Yellow(); 92bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev default: 93bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return Default(); 94bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 95bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 96bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *EndShadowByte() { return Default(); } 97bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev}; 98bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 99bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// ---------------------- Helper functions ----------------------- {{{1 100bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 101bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void PrintShadowByte(const char *before, u8 byte, 102bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *after = "\n") { 103bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 104bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s%s%x%x%s%s", before, 105bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev d.ShadowByte(byte), byte >> 4, byte & 15, d.EndShadowByte(), after); 106bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 107bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 108bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void PrintShadowBytes(const char *before, u8 *bytes, 109bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev u8 *guilty, uptr n) { 110bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 111bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (before) 112bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s%p:", before, bytes); 113bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev for (uptr i = 0; i < n; i++) { 114bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev u8 *p = bytes + i; 115bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *before = p == guilty ? "[" : 116bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev p - 1 == guilty ? "" : " "; 117bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *after = p == guilty ? "]" : ""; 118bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(before, *p, after); 119bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 120bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("\n"); 121bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 122bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 123bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void PrintLegend() { 124bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("Shadow byte legend (one shadow byte represents %d " 125bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "application bytes):\n", (int)SHADOW_GRANULARITY); 126bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Addressable: ", 0); 127bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(" Partially addressable: "); 128bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev for (u8 i = 1; i < SHADOW_GRANULARITY; i++) 129bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte("", i, " "); 130bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("\n"); 131bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Heap left redzone: ", kAsanHeapLeftRedzoneMagic); 132bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Heap right redzone: ", kAsanHeapRightRedzoneMagic); 133bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Freed heap region: ", kAsanHeapFreeMagic); 134bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Stack left redzone: ", kAsanStackLeftRedzoneMagic); 135bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Stack mid redzone: ", kAsanStackMidRedzoneMagic); 136bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Stack right redzone: ", kAsanStackRightRedzoneMagic); 137bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Stack partial redzone: ", kAsanStackPartialRedzoneMagic); 138bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Stack after return: ", kAsanStackAfterReturnMagic); 139bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Stack use after scope: ", kAsanStackUseAfterScopeMagic); 140bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Global redzone: ", kAsanGlobalRedzoneMagic); 141bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Global init order: ", kAsanInitializationOrderMagic); 142bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" Poisoned by user: ", kAsanUserPoisonedMemoryMagic); 143bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowByte(" ASan internal: ", kAsanInternalHeapMagic); 144bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 145bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 146bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void PrintShadowMemoryForAddress(uptr addr) { 147bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (!AddrIsInMem(addr)) 148bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return; 149bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr shadow_addr = MemToShadow(addr); 150bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const uptr n_bytes_per_row = 16; 151bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr aligned_shadow = shadow_addr & ~(n_bytes_per_row - 1); 152bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("Shadow bytes around the buggy address:\n"); 153bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev for (int i = -5; i <= 5; i++) { 154bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *prefix = (i == 0) ? "=>" : " "; 155bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowBytes(prefix, 156bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev (u8*)(aligned_shadow + i * n_bytes_per_row), 157bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev (u8*)shadow_addr, n_bytes_per_row); 158bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 159bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (flags()->print_legend) 160bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintLegend(); 161bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 162bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 163bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void PrintZoneForPointer(uptr ptr, uptr zone_ptr, 164bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *zone_name) { 165bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (zone_ptr) { 166bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (zone_name) { 167bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("malloc_zone_from_ptr(%p) = %p, which is %s\n", 168bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ptr, zone_ptr, zone_name); 169bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else { 170bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("malloc_zone_from_ptr(%p) = %p, which doesn't have a name\n", 171bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ptr, zone_ptr); 172bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 173bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else { 174bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("malloc_zone_from_ptr(%p) = 0\n", ptr); 175bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 176bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 177bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 178bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// ---------------------- Address Descriptions ------------------- {{{1 179bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 180bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic bool IsASCII(unsigned char c) { 181bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return /*0x00 <= c &&*/ c <= 0x7F; 182bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 183bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 184bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic const char *MaybeDemangleGlobalName(const char *name) { 185bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // We can spoil names of globals with C linkage, so use an heuristic 186bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // approach to check if the name should be demangled. 187bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return (name[0] == '_' && name[1] == 'Z') ? Demangle(name) : name; 188bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 189bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 190bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// Check if the global is a zero-terminated ASCII string. If so, print it. 191bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void PrintGlobalNameIfASCII(const __asan_global &g) { 192bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev for (uptr p = g.beg; p < g.beg + g.size - 1; p++) { 193bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev unsigned char c = *(unsigned char*)p; 194bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (c == '\0' || !IsASCII(c)) return; 195bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 196bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (*(char*)(g.beg + g.size - 1) != '\0') return; 197bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(" '%s' is ascii string '%s'\n", 198bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev MaybeDemangleGlobalName(g.name), (char*)g.beg); 199bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 200bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 201bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevbool DescribeAddressRelativeToGlobal(uptr addr, uptr size, 202bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const __asan_global &g) { 203bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static const uptr kMinimalDistanceFromAnotherGlobal = 64; 204bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (addr <= g.beg - kMinimalDistanceFromAnotherGlobal) return false; 205bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (addr >= g.beg + g.size_with_redzone) return false; 206bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 207bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Location()); 208bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (addr < g.beg) { 209bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%p is located %zd bytes to the left", (void*)addr, g.beg - addr); 210bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else if (addr + size > g.beg + g.size) { 211bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (addr < g.beg + g.size) 212bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr = g.beg + g.size; 213bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%p is located %zd bytes to the right", (void*)addr, 214bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr - (g.beg + g.size)); 215bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else { 216bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Can it happen? 217bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%p is located %zd bytes inside", (void*)addr, addr - g.beg); 218bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 219bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(" of global variable '%s' from '%s' (0x%zx) of size %zu\n", 220bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev MaybeDemangleGlobalName(g.name), g.module_name, g.beg, g.size); 221bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndLocation()); 222bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintGlobalNameIfASCII(g); 223bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return true; 224bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 225bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 226bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevbool DescribeAddressIfShadow(uptr addr) { 227bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (AddrIsInMem(addr)) 228bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return false; 229bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static const char kAddrInShadowReport[] = 230bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "Address %p is located in the %s.\n"; 231bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (AddrIsInShadowGap(addr)) { 232bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(kAddrInShadowReport, addr, "shadow gap area"); 233bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return true; 234bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 235bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (AddrIsInHighShadow(addr)) { 236bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(kAddrInShadowReport, addr, "high shadow area"); 237bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return true; 238bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 239bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (AddrIsInLowShadow(addr)) { 240bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(kAddrInShadowReport, addr, "low shadow area"); 241bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return true; 242bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 243bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK(0 && "Address is not in memory and not in shadow?"); 244bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return false; 245bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 246bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 247bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// Return " (thread_name) " or an empty string if the name is empty. 248bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevconst char *ThreadNameWithParenthesis(AsanThreadContext *t, char buff[], 249bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr buff_len) { 250bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *name = t->name; 251bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (name[0] == '\0') return ""; 252bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev buff[0] = 0; 253bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev internal_strncat(buff, " (", 3); 254bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev internal_strncat(buff, name, buff_len - 4); 255bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev internal_strncat(buff, ")", 2); 256bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return buff; 257bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 258bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 259bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevconst char *ThreadNameWithParenthesis(u32 tid, char buff[], 260bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr buff_len) { 261bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (tid == kInvalidTid) return ""; 262bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev asanThreadRegistry().CheckLocked(); 263bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThreadContext *t = GetThreadContextByTidLocked(tid); 264bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return ThreadNameWithParenthesis(t, buff, buff_len); 265bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 266bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 267bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevbool DescribeAddressIfStack(uptr addr, uptr access_size) { 268bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThread *t = FindThreadByStackAddress(addr); 269bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (!t) return false; 270bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const s64 kBufSize = 4095; 271bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char buf[kBufSize]; 272bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr offset = 0; 273bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr frame_pc = 0; 274bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char tname[128]; 275bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *frame_descr = t->GetFrameNameByAddr(addr, &offset, &frame_pc); 276bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 277bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#ifdef __powerpc64__ 278bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // On PowerPC64, the address of a function actually points to a 279bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // three-doubleword data structure with the first field containing 280bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // the address of the function's code. 281bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev frame_pc = *reinterpret_cast<uptr *>(frame_pc); 282bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#endif 283bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 284bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // This string is created by the compiler and has the following form: 285bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // "n alloc_1 alloc_2 ... alloc_n" 286bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // where alloc_i looks like "offset size len ObjectName ". 287bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK(frame_descr); 288bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 289bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Location()); 290bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("Address %p is located in stack of thread T%d%s " 291bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "at offset %zu in frame\n", 292bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr, t->tid(), 293bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(t->tid(), tname, sizeof(tname)), 294bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev offset); 295bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Now we print the frame where the alloca has happened. 296bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // We print this frame as a stack trace with one element. 297bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // The symbolizer may print more than one frame if inlining was involved. 298bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // The frame numbers may be different than those in the stack trace printed 299bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // previously. That's unfortunate, but I have no better solution, 300bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // especially given that the alloca may be from entirely different place 301bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // (e.g. use-after-scope, or different thread's stack). 302bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev StackTrace alloca_stack; 303bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev alloca_stack.trace[0] = frame_pc + 16; 304bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev alloca_stack.size = 1; 305bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndLocation()); 306bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(&alloca_stack); 307bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Report the number of stack objects. 308bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char *p; 309bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev s64 n_objects = internal_simple_strtoll(frame_descr, &p, 10); 310bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK_GT(n_objects, 0); 311bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(" This frame has %zu object(s):\n", n_objects); 312bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Report all objects in this frame. 313bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev for (s64 i = 0; i < n_objects; i++) { 314bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev s64 beg, size; 315bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev s64 len; 316bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev beg = internal_simple_strtoll(p, &p, 10); 317bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev size = internal_simple_strtoll(p, &p, 10); 318bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev len = internal_simple_strtoll(p, &p, 10); 319bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (beg <= 0 || size <= 0 || len < 0 || *p != ' ') { 320bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("AddressSanitizer can't parse the stack frame " 321bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "descriptor: |%s|\n", frame_descr); 322bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 323bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 324bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev p++; 325bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev buf[0] = 0; 326bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev internal_strncat(buf, p, static_cast<uptr>(Min(kBufSize, len))); 327bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev p += len; 328bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(" [%lld, %lld) '%s'\n", beg, beg + size, buf); 329bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 330bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("HINT: this may be a false positive if your program uses " 331bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "some custom stack unwind mechanism or swapcontext\n" 332bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev " (longjmp and C++ exceptions *are* supported)\n"); 333bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(t->context()); 334bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return true; 335bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 336bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 337bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void DescribeAccessToHeapChunk(AsanChunkView chunk, uptr addr, 338bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr access_size) { 339bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev sptr offset; 340bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 341bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Location()); 342bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (chunk.AddrIsAtLeft(addr, access_size, &offset)) { 343bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%p is located %zd bytes to the left of", (void*)addr, offset); 344bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else if (chunk.AddrIsAtRight(addr, access_size, &offset)) { 345bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (offset < 0) { 346bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr -= offset; 347bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev offset = 0; 348bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 349bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%p is located %zd bytes to the right of", (void*)addr, offset); 350bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else if (chunk.AddrIsInside(addr, access_size, &offset)) { 351bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%p is located %zd bytes inside of", (void*)addr, offset); 352bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else { 353bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%p is located somewhere around (this is AddressSanitizer bug!)", 354bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev (void*)addr); 355bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 356bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(" %zu-byte region [%p,%p)\n", chunk.UsedSize(), 357bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev (void*)(chunk.Beg()), (void*)(chunk.End())); 358bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndLocation()); 359bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 360bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 361bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid DescribeHeapAddress(uptr addr, uptr access_size) { 362bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanChunkView chunk = FindHeapChunkByAddress(addr); 363bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (!chunk.IsValid()) return; 364bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeAccessToHeapChunk(chunk, addr, access_size); 365bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK(chunk.AllocTid() != kInvalidTid); 366bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev asanThreadRegistry().CheckLocked(); 367bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThreadContext *alloc_thread = 368bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev GetThreadContextByTidLocked(chunk.AllocTid()); 369bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev StackTrace alloc_stack; 370bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev chunk.GetAllocStack(&alloc_stack); 371bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThread *t = GetCurrentThread(); 372bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK(t); 373bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char tname[128]; 374bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 375bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (chunk.FreeTid() != kInvalidTid) { 376bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThreadContext *free_thread = 377bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev GetThreadContextByTidLocked(chunk.FreeTid()); 378bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%sfreed by thread T%d%s here:%s\n", d.Allocation(), 379bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev free_thread->tid, 380bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(free_thread, tname, sizeof(tname)), 381bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev d.EndAllocation()); 382bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev StackTrace free_stack; 383bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev chunk.GetFreeStack(&free_stack); 384bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(&free_stack); 385bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%spreviously allocated by thread T%d%s here:%s\n", 386bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev d.Allocation(), alloc_thread->tid, 387bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)), 388bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev d.EndAllocation()); 389bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(&alloc_stack); 390bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(t->context()); 391bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(free_thread); 392bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(alloc_thread); 393bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } else { 394bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%sallocated by thread T%d%s here:%s\n", d.Allocation(), 395bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev alloc_thread->tid, 396bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(alloc_thread, tname, sizeof(tname)), 397bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev d.EndAllocation()); 398bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(&alloc_stack); 399bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(t->context()); 400bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(alloc_thread); 401bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 402bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 403bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 404bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid DescribeAddress(uptr addr, uptr access_size) { 405bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Check if this is shadow or shadow gap. 406bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (DescribeAddressIfShadow(addr)) 407bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return; 408bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK(AddrIsInMem(addr)); 409bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (DescribeAddressIfGlobal(addr, access_size)) 410bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return; 411bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (DescribeAddressIfStack(addr, access_size)) 412bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return; 413bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Assume it is a heap address. 414bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, access_size); 415bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 416bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 417bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// ------------------- Thread description -------------------- {{{1 418bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 419bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid DescribeThread(AsanThreadContext *context) { 420bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK(context); 421bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev asanThreadRegistry().CheckLocked(); 422bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // No need to announce the main thread. 423bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (context->tid == 0 || context->announced) { 424bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev return; 425bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 426bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev context->announced = true; 427bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char tname[128]; 428bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("Thread T%d%s", context->tid, 429bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(context->tid, tname, sizeof(tname))); 430bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf(" created by T%d%s here:\n", 431bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev context->parent_tid, 432bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(context->parent_tid, 433bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev tname, sizeof(tname))); 434bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(&context->stack); 435bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Recursively described parent thread if needed. 436bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (flags()->print_full_thread_history) { 437bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThreadContext *parent_context = 438bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev GetThreadContextByTidLocked(context->parent_tid); 439bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(parent_context); 440bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 441bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 442bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 443bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// -------------------- Different kinds of reports ----------------- {{{1 444bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 445bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// Use ScopedInErrorReport to run common actions just before and 446bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// immediately after printing error report. 447bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevclass ScopedInErrorReport { 448bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev public: 449bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport() { 450bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static atomic_uint32_t num_calls; 451bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static u32 reporting_thread_tid; 452bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (atomic_fetch_add(&num_calls, 1, memory_order_relaxed) != 0) { 453bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Do not print more than one report, otherwise they will mix up. 454bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Error reporting functions shouldn't return at this situation, as 455bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // they are defined as no-return. 456bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("AddressSanitizer: while reporting a bug found another one." 457bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "Ignoring.\n"); 458bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev u32 current_tid = GetCurrentTidOrInvalid(); 459bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (current_tid != reporting_thread_tid) { 460bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // ASan found two bugs in different threads simultaneously. Sleep 461bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // long enough to make sure that the thread which started to print 462bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // an error report will finish doing it. 463bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev SleepForSeconds(Max(100, flags()->sleep_before_dying + 1)); 464bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 465bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // If we're still not dead for some reason, use raw _exit() instead of 466bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Die() to bypass any additional checks. 467bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev internal__exit(flags()->exitcode); 468bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 469bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ASAN_ON_ERROR(); 470bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Make sure the registry and sanitizer report mutexes are locked while 471bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // we're printing an error report. 472bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // We can lock them only here to avoid self-deadlock in case of 473bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // recursive reports. 474bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev asanThreadRegistry().Lock(); 475bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CommonSanitizerReportMutex.Lock(); 476bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev reporting_thread_tid = GetCurrentTidOrInvalid(); 477bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("====================================================" 478bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "=============\n"); 479bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (reporting_thread_tid != kInvalidTid) { 480bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // We started reporting an error message. Stop using the fake stack 481bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // in case we call an instrumented function from a symbolizer. 482bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThread *curr_thread = GetCurrentThread(); 483bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK(curr_thread); 484bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (curr_thread->fake_stack()) 485bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev curr_thread->fake_stack()->StopUsingFakeStack(); 486bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 487bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 488bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Destructor is NORETURN, as functions that report errors are. 489bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev NORETURN ~ScopedInErrorReport() { 490bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Make sure the current thread is announced. 491bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AsanThread *curr_thread = GetCurrentThread(); 492bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (curr_thread) { 493bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeThread(curr_thread->context()); 494bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 495bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Print memory stats. 496bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (flags()->print_stats) 497bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev __asan_print_accumulated_stats(); 498bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (error_report_callback) { 499bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev error_report_callback(error_message_buffer); 500bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 501bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ABORTING\n"); 502bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Die(); 503bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 504bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev}; 505bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 506bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevstatic void ReportSummary(const char *error_type, StackTrace *stack) { 507bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (!stack->size) return; 508bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (IsSymbolizerAvailable()) { 509bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AddressInfo ai; 510bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Currently, we include the first stack frame into the report summary. 511bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Maybe sometimes we need to choose another frame (e.g. skip memcpy/etc). 512bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr pc = StackTrace::GetPreviousInstructionPc(stack->trace[0]); 513bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev SymbolizeCode(pc, &ai, 1); 514bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportErrorSummary(error_type, 515bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev StripPathPrefix(ai.file, 516bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev common_flags()->strip_path_prefix), 517bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ai.line, ai.function); 518bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 519bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // FIXME: do we need to print anything at all if there is no symbolizer? 520bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 521bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 522bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportSIGSEGV(uptr pc, uptr sp, uptr bp, uptr addr) { 523bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 524bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 525bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 526bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: SEGV on unknown address %p" 527bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev " (pc %p sp %p bp %p T%d)\n", 528bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev (void*)addr, (void*)pc, (void*)sp, (void*)bp, 529bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev GetCurrentTidOrInvalid()); 530bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 531bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("AddressSanitizer can not provide additional info.\n"); 532bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev GET_STACK_TRACE_FATAL(pc, bp); 533bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(&stack); 534bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary("SEGV", &stack); 535bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 536bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 537bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportDoubleFree(uptr addr, StackTrace *stack) { 538bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 539bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 540bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 541bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char tname[128]; 542bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev u32 curr_tid = GetCurrentTidOrInvalid(); 543bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: attempting double-free on %p in " 544bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "thread T%d%s:\n", 545bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr, curr_tid, 546bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname))); 547bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 548bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 549bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 550bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 551bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary("double-free", stack); 552bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 553bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 554bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportFreeNotMalloced(uptr addr, StackTrace *stack) { 555bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 556bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 557bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 558bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char tname[128]; 559bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev u32 curr_tid = GetCurrentTidOrInvalid(); 560bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: attempting free on address " 561bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "which was not malloc()-ed: %p in thread T%d%s\n", addr, 562bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev curr_tid, ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname))); 563bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 564bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 565bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 566bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary("bad-free", stack); 567bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 568bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 569bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportAllocTypeMismatch(uptr addr, StackTrace *stack, 570bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AllocType alloc_type, 571bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev AllocType dealloc_type) { 572bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static const char *alloc_names[] = 573bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev {"INVALID", "malloc", "operator new", "operator new []"}; 574bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev static const char *dealloc_names[] = 575bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev {"INVALID", "free", "operator delete", "operator delete []"}; 576bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev CHECK_NE(alloc_type, dealloc_type); 577bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 578bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 579bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 580bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: alloc-dealloc-mismatch (%s vs %s) on %p\n", 581bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev alloc_names[alloc_type], dealloc_names[dealloc_type], addr); 582bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 583bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 584bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 585bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary("alloc-dealloc-mismatch", stack); 586bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("HINT: if you don't care about these warnings you may set " 587bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "ASAN_OPTIONS=alloc_dealloc_mismatch=0\n"); 588bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 589bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 590bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportMallocUsableSizeNotOwned(uptr addr, StackTrace *stack) { 591bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 592bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 593bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 594bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: attempting to call " 595bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "malloc_usable_size() for pointer which is " 596bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "not owned: %p\n", addr); 597bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 598bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 599bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 600bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary("bad-malloc_usable_size", stack); 601bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 602bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 603bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportAsanGetAllocatedSizeNotOwned(uptr addr, StackTrace *stack) { 604bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 605bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 606bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 607bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: attempting to call " 608bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "__asan_get_allocated_size() for pointer which is " 609bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "not owned: %p\n", addr); 610bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 611bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 612bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 613bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary("bad-__asan_get_allocated_size", stack); 614bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 615bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 616bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportStringFunctionMemoryRangesOverlap( 617bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *function, const char *offset1, uptr length1, 618bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *offset2, uptr length2, StackTrace *stack) { 619bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 620bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 621bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char bug_type[100]; 622bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev internal_snprintf(bug_type, sizeof(bug_type), "%s-param-overlap", function); 623bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 624bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: %s: " 625bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "memory ranges [%p,%p) and [%p, %p) overlap\n", \ 626bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_type, offset1, offset1 + length1, offset2, offset2 + length2); 627bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 628bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 629bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeAddress((uptr)offset1, length1); 630bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeAddress((uptr)offset2, length2); 631bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary(bug_type, stack); 632bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 633bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 634bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// ----------------------- Mac-specific reports ----------------- {{{1 635bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 636bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid WarnMacFreeUnallocated( 637bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { 638bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Just print a warning here. 639bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("free_common(%p) -- attempting to free unallocated memory.\n" 640bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "AddressSanitizer is ignoring this error on Mac OS now.\n", 641bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr); 642bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintZoneForPointer(addr, zone_ptr, zone_name); 643bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 644bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 645bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 646bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 647bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportMacMzReallocUnknown( 648bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { 649bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 650bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("mz_realloc(%p) -- attempting to realloc unallocated memory.\n" 651bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "This is an unrecoverable problem, exiting now.\n", 652bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr); 653bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintZoneForPointer(addr, zone_ptr, zone_name); 654bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 655bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 656bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 657bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 658bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid ReportMacCfReallocUnknown( 659bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr addr, uptr zone_ptr, const char *zone_name, StackTrace *stack) { 660bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 661bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("cf_realloc(%p) -- attempting to realloc unallocated memory.\n" 662bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "This is an unrecoverable problem, exiting now.\n", 663bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev addr); 664bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintZoneForPointer(addr, zone_ptr, zone_name); 665bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(stack); 666bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeHeapAddress(addr, 1); 667bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 668bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 669bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} // namespace __asan 670bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 671bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// --------------------------- Interface --------------------- {{{1 672bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevusing namespace __asan; // NOLINT 673bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 674bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid __asan_report_error(uptr pc, uptr bp, uptr sp, 675bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev uptr addr, bool is_write, uptr access_size) { 676bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ScopedInErrorReport in_report; 677bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 678bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // Determine the error type. 679bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev const char *bug_descr = "unknown-crash"; 680bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (AddrIsInMem(addr)) { 681bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev u8 *shadow_addr = (u8*)MemToShadow(addr); 682bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // If we are accessing 16 bytes, look at the second shadow byte. 683bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (*shadow_addr == 0 && access_size > SHADOW_GRANULARITY) 684bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev shadow_addr++; 685bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev // If we are in the partial right redzone, look at the next shadow byte. 686bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (*shadow_addr > 0 && *shadow_addr < 128) 687bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev shadow_addr++; 688bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev switch (*shadow_addr) { 689bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanHeapLeftRedzoneMagic: 690bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanHeapRightRedzoneMagic: 691bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "heap-buffer-overflow"; 692bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 693bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanHeapFreeMagic: 694bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "heap-use-after-free"; 695bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 696bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackLeftRedzoneMagic: 697bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "stack-buffer-underflow"; 698bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 699bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanInitializationOrderMagic: 700bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "initialization-order-fiasco"; 701bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 702bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackMidRedzoneMagic: 703bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackRightRedzoneMagic: 704bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackPartialRedzoneMagic: 705bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "stack-buffer-overflow"; 706bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 707bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackAfterReturnMagic: 708bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "stack-use-after-return"; 709bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 710bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanUserPoisonedMemoryMagic: 711bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "use-after-poison"; 712bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 713bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanStackUseAfterScopeMagic: 714bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "stack-use-after-scope"; 715bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 716bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev case kAsanGlobalRedzoneMagic: 717bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr = "global-buffer-overflow"; 718bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev break; 719bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 720bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 721bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Decorator d; 722bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.Warning()); 723bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Report("ERROR: AddressSanitizer: %s on address " 724bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev "%p at pc 0x%zx bp 0x%zx sp 0x%zx\n", 725bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev bug_descr, (void*)addr, pc, bp, sp); 726bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s", d.EndWarning()); 727bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 728bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev u32 curr_tid = GetCurrentTidOrInvalid(); 729bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev char tname[128]; 730bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev Printf("%s%s of size %zu at %p thread T%d%s%s\n", 731bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev d.Access(), 732bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev access_size ? (is_write ? "WRITE" : "READ") : "ACCESS", 733bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev access_size, (void*)addr, curr_tid, 734bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ThreadNameWithParenthesis(curr_tid, tname, sizeof(tname)), 735bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev d.EndAccess()); 736bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 737bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev GET_STACK_TRACE_FATAL(pc, bp); 738bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintStack(&stack); 739bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 740bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeAddress(addr, access_size); 741bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev ReportSummary(bug_descr, &stack); 742bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev PrintShadowMemoryForAddress(addr); 743bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 744bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 745bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid NOINLINE __asan_set_error_report_callback(void (*callback)(const char*)) { 746bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev error_report_callback = callback; 747bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev if (callback) { 748bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev error_message_buffer_size = 1 << 16; 749bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev error_message_buffer = 750bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev (char*)MmapOrDie(error_message_buffer_size, __FUNCTION__); 751bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev error_message_buffer_pos = 0; 752bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev } 753bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 754bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 755bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid __asan_describe_address(uptr addr) { 756bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev DescribeAddress(addr, 1); 757bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev} 758bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev 759bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#if !SANITIZER_SUPPORTS_WEAK_HOOKS 760bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// Provide default implementation of __asan_on_error that does nothing 761bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev// and may be overriden by user. 762bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor GoulishevSANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE NOINLINE 763bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishevvoid __asan_on_error() {} 764bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev#endif 765bda86ae8203fd360c4e87c310498da1e1e4c53a7Yavor Goulishev