Alexey Samsonov | e5f5895 | 2012-06-04 13:50:10 +0000 | [diff] [blame] | 1 | //===-- asan_malloc_linux.cc ----------------------------------------------===// |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file is a part of AddressSanitizer, an address sanity checker. |
| 11 | // |
| 12 | // Linux-specific malloc interception. |
| 13 | // We simply define functions like malloc, free, realloc, etc. |
| 14 | // They will replace the corresponding libc functions automagically. |
| 15 | //===----------------------------------------------------------------------===// |
Evgeniy Stepanov | 24e1372 | 2013-03-19 14:33:38 +0000 | [diff] [blame] | 16 | |
| 17 | #include "sanitizer_common/sanitizer_platform.h" |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 18 | #if SANITIZER_FREEBSD || SANITIZER_LINUX |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 19 | |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 20 | #include "sanitizer_common/sanitizer_tls_get_addr.h" |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 21 | #include "asan_allocator.h" |
| 22 | #include "asan_interceptors.h" |
| 23 | #include "asan_internal.h" |
| 24 | #include "asan_stack.h" |
| 25 | |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 26 | // ---------------------- Replacement functions ---------------- {{{1 |
| 27 | using namespace __asan; // NOLINT |
| 28 | |
Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 29 | static const uptr kCallocPoolSize = 1024; |
| 30 | static uptr calloc_memory_for_dlsym[kCallocPoolSize]; |
| 31 | |
| 32 | static bool IsInCallocPool(const void *ptr) { |
| 33 | sptr off = (sptr)ptr - (sptr)calloc_memory_for_dlsym; |
| 34 | return 0 <= off && off < (sptr)kCallocPoolSize; |
| 35 | } |
| 36 | |
Alexey Samsonov | f2598fc | 2012-02-02 10:39:40 +0000 | [diff] [blame] | 37 | INTERCEPTOR(void, free, void *ptr) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 38 | GET_STACK_TRACE_FREE; |
Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 39 | if (UNLIKELY(IsInCallocPool(ptr))) |
| 40 | return; |
Kostya Serebryany | fe6d916 | 2012-12-21 08:53:59 +0000 | [diff] [blame] | 41 | asan_free(ptr, &stack, FROM_MALLOC); |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 42 | } |
| 43 | |
Alexey Samsonov | f2598fc | 2012-02-02 10:39:40 +0000 | [diff] [blame] | 44 | INTERCEPTOR(void, cfree, void *ptr) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 45 | GET_STACK_TRACE_FREE; |
Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 46 | if (UNLIKELY(IsInCallocPool(ptr))) |
| 47 | return; |
Kostya Serebryany | fe6d916 | 2012-12-21 08:53:59 +0000 | [diff] [blame] | 48 | asan_free(ptr, &stack, FROM_MALLOC); |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 49 | } |
| 50 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 51 | INTERCEPTOR(void*, malloc, uptr size) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 52 | GET_STACK_TRACE_MALLOC; |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 53 | return asan_malloc(size, &stack); |
| 54 | } |
| 55 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 56 | INTERCEPTOR(void*, calloc, uptr nmemb, uptr size) { |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 57 | if (UNLIKELY(!asan_inited)) { |
Alexey Samsonov | 09672ca | 2012-02-08 13:45:31 +0000 | [diff] [blame] | 58 | // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym. |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 59 | static uptr allocated; |
| 60 | uptr size_in_words = ((nmemb * size) + kWordSize - 1) / kWordSize; |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 61 | void *mem = (void*)&calloc_memory_for_dlsym[allocated]; |
| 62 | allocated += size_in_words; |
| 63 | CHECK(allocated < kCallocPoolSize); |
| 64 | return mem; |
| 65 | } |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 66 | GET_STACK_TRACE_MALLOC; |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 67 | return asan_calloc(nmemb, size, &stack); |
| 68 | } |
| 69 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 70 | INTERCEPTOR(void*, realloc, void *ptr, uptr size) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 71 | GET_STACK_TRACE_MALLOC; |
Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 72 | if (UNLIKELY(IsInCallocPool(ptr))) { |
| 73 | uptr offset = (uptr)ptr - (uptr)calloc_memory_for_dlsym; |
| 74 | uptr copy_size = Min(size, kCallocPoolSize - offset); |
| 75 | void *new_ptr = asan_malloc(size, &stack); |
| 76 | internal_memcpy(new_ptr, ptr, copy_size); |
| 77 | return new_ptr; |
| 78 | } |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 79 | return asan_realloc(ptr, size, &stack); |
| 80 | } |
| 81 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 82 | INTERCEPTOR(void*, memalign, uptr boundary, uptr size) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 83 | GET_STACK_TRACE_MALLOC; |
Kostya Serebryany | fe6d916 | 2012-12-21 08:53:59 +0000 | [diff] [blame] | 84 | return asan_memalign(boundary, size, &stack, FROM_MALLOC); |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 85 | } |
| 86 | |
Stephen Hines | 6a211c5 | 2014-07-21 00:49:56 -0700 | [diff] [blame] | 87 | INTERCEPTOR(void*, aligned_alloc, uptr boundary, uptr size) { |
| 88 | GET_STACK_TRACE_MALLOC; |
| 89 | return asan_memalign(boundary, size, &stack, FROM_MALLOC); |
| 90 | } |
| 91 | |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 92 | INTERCEPTOR(void*, __libc_memalign, uptr boundary, uptr size) { |
| 93 | GET_STACK_TRACE_MALLOC; |
| 94 | void *res = asan_memalign(boundary, size, &stack, FROM_MALLOC); |
| 95 | DTLS_on_libc_memalign(res, size * boundary); |
| 96 | return res; |
| 97 | } |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 98 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 99 | INTERCEPTOR(uptr, malloc_usable_size, void *ptr) { |
Alexey Samsonov | 1b17f5b | 2013-11-13 14:46:58 +0000 | [diff] [blame] | 100 | GET_CURRENT_PC_BP_SP; |
| 101 | (void)sp; |
| 102 | return asan_malloc_usable_size(ptr, pc, bp); |
Alexey Samsonov | 4fd95f1 | 2012-01-17 06:39:10 +0000 | [diff] [blame] | 103 | } |
| 104 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 105 | // We avoid including malloc.h for portability reasons. |
| 106 | // man mallinfo says the fields are "long", but the implementation uses int. |
| 107 | // It doesn't matter much -- we just need to make sure that the libc's mallinfo |
| 108 | // is not called. |
| 109 | struct fake_mallinfo { |
| 110 | int x[10]; |
| 111 | }; |
| 112 | |
| 113 | INTERCEPTOR(struct fake_mallinfo, mallinfo, void) { |
| 114 | struct fake_mallinfo res; |
Alexey Samsonov | 09672ca | 2012-02-08 13:45:31 +0000 | [diff] [blame] | 115 | REAL(memset)(&res, 0, sizeof(res)); |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 116 | return res; |
| 117 | } |
| 118 | |
Alexey Samsonov | f2598fc | 2012-02-02 10:39:40 +0000 | [diff] [blame] | 119 | INTERCEPTOR(int, mallopt, int cmd, int value) { |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 120 | return -1; |
| 121 | } |
| 122 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 123 | INTERCEPTOR(int, posix_memalign, void **memptr, uptr alignment, uptr size) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 124 | GET_STACK_TRACE_MALLOC; |
Evgeniy Stepanov | 739eb79 | 2012-03-21 11:32:46 +0000 | [diff] [blame] | 125 | // Printf("posix_memalign: %zx %zu\n", alignment, size); |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 126 | return asan_posix_memalign(memptr, alignment, size, &stack); |
| 127 | } |
| 128 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 129 | INTERCEPTOR(void*, valloc, uptr size) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 130 | GET_STACK_TRACE_MALLOC; |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 131 | return asan_valloc(size, &stack); |
| 132 | } |
| 133 | |
Kostya Serebryany | e7539bf | 2012-06-25 09:58:29 +0000 | [diff] [blame] | 134 | INTERCEPTOR(void*, pvalloc, uptr size) { |
Kostya Serebryany | a30c8f9 | 2012-12-13 09:34:23 +0000 | [diff] [blame] | 135 | GET_STACK_TRACE_MALLOC; |
Kostya Serebryany | 1e172b4 | 2011-11-30 01:07:02 +0000 | [diff] [blame] | 136 | return asan_pvalloc(size, &stack); |
| 137 | } |
Kostya Serebryany | d6567c5 | 2011-12-01 21:40:52 +0000 | [diff] [blame] | 138 | |
Kostya Serebryany | 73bad81 | 2012-12-20 11:54:21 +0000 | [diff] [blame] | 139 | INTERCEPTOR(void, malloc_stats, void) { |
Kostya Serebryany | 709a33e | 2012-12-26 12:20:35 +0000 | [diff] [blame] | 140 | __asan_print_accumulated_stats(); |
Kostya Serebryany | 73bad81 | 2012-12-20 11:54:21 +0000 | [diff] [blame] | 141 | } |
| 142 | |
Stephen Hines | 6d18623 | 2014-11-26 17:56:19 -0800 | [diff] [blame] | 143 | #if SANITIZER_ANDROID |
| 144 | // Format of __libc_malloc_dispatch has changed in Android L. |
| 145 | // While we are moving towards a solution that does not depend on bionic |
| 146 | // internals, here is something to support both K* and L releases. |
| 147 | struct MallocDebugK { |
| 148 | void *(*malloc)(uptr bytes); |
| 149 | void (*free)(void *mem); |
| 150 | void *(*calloc)(uptr n_elements, uptr elem_size); |
| 151 | void *(*realloc)(void *oldMem, uptr bytes); |
| 152 | void *(*memalign)(uptr alignment, uptr bytes); |
| 153 | uptr (*malloc_usable_size)(void *mem); |
| 154 | }; |
| 155 | |
| 156 | struct MallocDebugL { |
| 157 | void *(*calloc)(uptr n_elements, uptr elem_size); |
| 158 | void (*free)(void *mem); |
| 159 | fake_mallinfo (*mallinfo)(void); |
| 160 | void *(*malloc)(uptr bytes); |
| 161 | uptr (*malloc_usable_size)(void *mem); |
| 162 | void *(*memalign)(uptr alignment, uptr bytes); |
| 163 | int (*posix_memalign)(void **memptr, uptr alignment, uptr size); |
| 164 | void* (*pvalloc)(uptr size); |
| 165 | void *(*realloc)(void *oldMem, uptr bytes); |
| 166 | void* (*valloc)(uptr size); |
| 167 | }; |
| 168 | |
| 169 | ALIGNED(32) const MallocDebugK asan_malloc_dispatch_k = { |
| 170 | WRAP(malloc), WRAP(free), WRAP(calloc), |
| 171 | WRAP(realloc), WRAP(memalign), WRAP(malloc_usable_size)}; |
| 172 | |
| 173 | ALIGNED(32) const MallocDebugL asan_malloc_dispatch_l = { |
| 174 | WRAP(calloc), WRAP(free), WRAP(mallinfo), |
| 175 | WRAP(malloc), WRAP(malloc_usable_size), WRAP(memalign), |
| 176 | WRAP(posix_memalign), WRAP(pvalloc), WRAP(realloc), |
| 177 | WRAP(valloc)}; |
| 178 | |
| 179 | namespace __asan { |
| 180 | void ReplaceSystemMalloc() { |
| 181 | void **__libc_malloc_dispatch_p = |
| 182 | (void **)AsanDlSymNext("__libc_malloc_dispatch"); |
| 183 | if (__libc_malloc_dispatch_p) { |
| 184 | // Decide on K vs L dispatch format by the presence of |
| 185 | // __libc_malloc_default_dispatch export in libc. |
| 186 | void *default_dispatch_p = AsanDlSymNext("__libc_malloc_default_dispatch"); |
| 187 | if (default_dispatch_p) |
| 188 | *__libc_malloc_dispatch_p = (void *)&asan_malloc_dispatch_k; |
| 189 | else |
| 190 | *__libc_malloc_dispatch_p = (void *)&asan_malloc_dispatch_l; |
| 191 | } |
| 192 | } |
| 193 | } // namespace __asan |
| 194 | |
| 195 | #else // SANITIZER_ANDROID |
| 196 | |
| 197 | namespace __asan { |
| 198 | void ReplaceSystemMalloc() { |
| 199 | } |
| 200 | } // namespace __asan |
| 201 | #endif // SANITIZER_ANDROID |
| 202 | |
Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame] | 203 | #endif // SANITIZER_FREEBSD || SANITIZER_LINUX |