diff options
Diffstat (limited to 'lib/asan/asan_malloc_linux.cc')
-rw-r--r-- | lib/asan/asan_malloc_linux.cc | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/lib/asan/asan_malloc_linux.cc b/lib/asan/asan_malloc_linux.cc new file mode 100644 index 000000000..1b9671453 --- /dev/null +++ b/lib/asan/asan_malloc_linux.cc @@ -0,0 +1,139 @@ +//===-- asan_malloc_linux.cc ------------------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file is a part of AddressSanitizer, an address sanity checker. +// +// Linux-specific malloc interception. +// We simply define functions like malloc, free, realloc, etc. +// They will replace the corresponding libc functions automagically. +//===----------------------------------------------------------------------===// + +#include "asan_allocator.h" +#include "asan_interceptors.h" +#include "asan_internal.h" +#include "asan_stack.h" + +#include <malloc.h> + +#define INTERCEPTOR_ATTRIBUTE __attribute__((visibility("default"))) + +#ifdef ANDROID +struct MallocDebug { + void* (*malloc)(size_t bytes); + void (*free)(void* mem); + void* (*calloc)(size_t n_elements, size_t elem_size); + void* (*realloc)(void* oldMem, size_t bytes); + void* (*memalign)(size_t alignment, size_t bytes); +}; + +const MallocDebug asan_malloc_dispatch __attribute__((aligned(32))) = { + malloc, free, calloc, realloc, memalign +}; + +extern "C" const MallocDebug* __libc_malloc_dispatch; + +namespace __asan { +void ReplaceSystemMalloc() { + __libc_malloc_dispatch = &asan_malloc_dispatch; +} +} // namespace __asan + +#else // ANDROID + +namespace __asan { +void ReplaceSystemMalloc() { +} +} // namespace __asan +#endif // ANDROID + +// ---------------------- Replacement functions ---------------- {{{1 +using namespace __asan; // NOLINT + +extern "C" { +INTERCEPTOR_ATTRIBUTE +void free(void *ptr) { + GET_STACK_TRACE_HERE_FOR_FREE(ptr); + asan_free(ptr, &stack); +} + +INTERCEPTOR_ATTRIBUTE +void cfree(void *ptr) { + GET_STACK_TRACE_HERE_FOR_FREE(ptr); + asan_free(ptr, &stack); +} + +INTERCEPTOR_ATTRIBUTE +void *malloc(size_t size) { + GET_STACK_TRACE_HERE_FOR_MALLOC; + return asan_malloc(size, &stack); +} + +INTERCEPTOR_ATTRIBUTE +void *calloc(size_t nmemb, size_t size) { + if (!asan_inited) { + // Hack: dlsym calls calloc before real_calloc is retrieved from dlsym. + const size_t kCallocPoolSize = 1024; + static uintptr_t calloc_memory_for_dlsym[kCallocPoolSize]; + static size_t allocated; + size_t size_in_words = ((nmemb * size) + kWordSize - 1) / kWordSize; + void *mem = (void*)&calloc_memory_for_dlsym[allocated]; + allocated += size_in_words; + CHECK(allocated < kCallocPoolSize); + return mem; + } + GET_STACK_TRACE_HERE_FOR_MALLOC; + return asan_calloc(nmemb, size, &stack); +} + +INTERCEPTOR_ATTRIBUTE +void *realloc(void *ptr, size_t size) { + GET_STACK_TRACE_HERE_FOR_MALLOC; + return asan_realloc(ptr, size, &stack); +} + +INTERCEPTOR_ATTRIBUTE +void *memalign(size_t boundary, size_t size) { + GET_STACK_TRACE_HERE_FOR_MALLOC; + return asan_memalign(boundary, size, &stack); +} + +void* __libc_memalign(size_t align, size_t s) + __attribute__((alias("memalign"))); + +INTERCEPTOR_ATTRIBUTE +struct mallinfo mallinfo() { + struct mallinfo res; + real_memset(&res, 0, sizeof(res)); + return res; +} + +INTERCEPTOR_ATTRIBUTE +int mallopt(int cmd, int value) { + return -1; +} + +INTERCEPTOR_ATTRIBUTE +int posix_memalign(void **memptr, size_t alignment, size_t size) { + GET_STACK_TRACE_HERE_FOR_MALLOC; + // Printf("posix_memalign: %lx %ld\n", alignment, size); + return asan_posix_memalign(memptr, alignment, size, &stack); +} + +INTERCEPTOR_ATTRIBUTE +void *valloc(size_t size) { + GET_STACK_TRACE_HERE_FOR_MALLOC; + return asan_valloc(size, &stack); +} + +INTERCEPTOR_ATTRIBUTE +void *pvalloc(size_t size) { + GET_STACK_TRACE_HERE_FOR_MALLOC; + return asan_pvalloc(size, &stack); +} +} // extern "C" |