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