1 //===-- asan_malloc_mac.cpp -----------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of AddressSanitizer, an address sanity checker. 10 // 11 // Mac-specific malloc interception. 12 //===----------------------------------------------------------------------===// 13 14 #include "sanitizer_common/sanitizer_platform.h" 15 #if SANITIZER_APPLE 16 17 #include "asan_interceptors.h" 18 #include "asan_report.h" 19 #include "asan_stack.h" 20 #include "asan_stats.h" 21 #include "lsan/lsan_common.h" 22 23 using namespace __asan; 24 #define COMMON_MALLOC_ZONE_NAME "asan" 25 #define COMMON_MALLOC_ENTER() ENSURE_ASAN_INITED() 26 #define COMMON_MALLOC_SANITIZER_INITIALIZED asan_inited 27 #define COMMON_MALLOC_FORCE_LOCK() asan_mz_force_lock() 28 #define COMMON_MALLOC_FORCE_UNLOCK() asan_mz_force_unlock() 29 #define COMMON_MALLOC_MEMALIGN(alignment, size) \ 30 GET_STACK_TRACE_MALLOC; \ 31 void *p = asan_memalign(alignment, size, &stack, FROM_MALLOC) 32 #define COMMON_MALLOC_MALLOC(size) \ 33 GET_STACK_TRACE_MALLOC; \ 34 void *p = asan_malloc(size, &stack) 35 #define COMMON_MALLOC_REALLOC(ptr, size) \ 36 GET_STACK_TRACE_MALLOC; \ 37 void *p = asan_realloc(ptr, size, &stack); 38 #define COMMON_MALLOC_CALLOC(count, size) \ 39 GET_STACK_TRACE_MALLOC; \ 40 void *p = asan_calloc(count, size, &stack); 41 #define COMMON_MALLOC_POSIX_MEMALIGN(memptr, alignment, size) \ 42 GET_STACK_TRACE_MALLOC; \ 43 int res = asan_posix_memalign(memptr, alignment, size, &stack); 44 #define COMMON_MALLOC_VALLOC(size) \ 45 GET_STACK_TRACE_MALLOC; \ 46 void *p = asan_memalign(GetPageSizeCached(), size, &stack, FROM_MALLOC); 47 #define COMMON_MALLOC_FREE(ptr) \ 48 GET_STACK_TRACE_FREE; \ 49 asan_free(ptr, &stack, FROM_MALLOC); 50 #define COMMON_MALLOC_SIZE(ptr) \ 51 uptr size = asan_mz_size(ptr); 52 #define COMMON_MALLOC_FILL_STATS(zone, stats) \ 53 AsanMallocStats malloc_stats; \ 54 FillMallocStatistics(&malloc_stats); \ 55 CHECK(sizeof(malloc_statistics_t) == sizeof(AsanMallocStats)); \ 56 internal_memcpy(stats, &malloc_stats, sizeof(malloc_statistics_t)); 57 #define COMMON_MALLOC_REPORT_UNKNOWN_REALLOC(ptr, zone_ptr, zone_name) \ 58 GET_STACK_TRACE_FREE; \ 59 ReportMacMzReallocUnknown((uptr)ptr, (uptr)zone_ptr, zone_name, &stack); 60 #define COMMON_MALLOC_NAMESPACE __asan 61 #define COMMON_MALLOC_HAS_ZONE_ENUMERATOR 0 62 #define COMMON_MALLOC_HAS_EXTRA_INTROSPECTION_INIT 1 63 64 #include "sanitizer_common/sanitizer_malloc_mac.inc" 65 66 namespace COMMON_MALLOC_NAMESPACE { 67 68 bool HandleDlopenInit() { 69 static_assert(SANITIZER_SUPPORTS_INIT_FOR_DLOPEN, 70 "Expected SANITIZER_SUPPORTS_INIT_FOR_DLOPEN to be true"); 71 // We have no reliable way of knowing how we are being loaded 72 // so make it a requirement on Apple platforms to set this environment 73 // variable to indicate that we want to perform initialization via 74 // dlopen(). 75 auto init_str = GetEnv("APPLE_ASAN_INIT_FOR_DLOPEN"); 76 if (!init_str) 77 return false; 78 if (internal_strncmp(init_str, "1", 1) != 0) 79 return false; 80 // When we are loaded via `dlopen()` path we still initialize the malloc zone 81 // so Symbolication clients (e.g. `leaks`) that load the ASan allocator can 82 // find an initialized malloc zone. 83 InitMallocZoneFields(); 84 return true; 85 } 86 } // namespace COMMON_MALLOC_NAMESPACE 87 88 namespace { 89 90 void mi_extra_init(sanitizer_malloc_introspection_t *mi) { 91 uptr last_byte_plus_one = 0; 92 mi->allocator_ptr = 0; 93 // Range is [begin_ptr, end_ptr) 94 __lsan::GetAllocatorGlobalRange(&(mi->allocator_ptr), &last_byte_plus_one); 95 CHECK_NE(mi->allocator_ptr, 0); 96 CHECK_GT(last_byte_plus_one, mi->allocator_ptr); 97 mi->allocator_size = last_byte_plus_one - (mi->allocator_ptr); 98 CHECK_GT(mi->allocator_size, 0); 99 } 100 } // namespace 101 102 #endif 103