| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <errno.h> |
| #include <malloc.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/param.h> |
| #include <unistd.h> |
| |
| #include <private/bionic_malloc_dispatch.h> |
| |
| // ------------------------------------------------------------------------ |
| // Global Data |
| // ------------------------------------------------------------------------ |
| const MallocDispatch* g_dispatch; |
| // ------------------------------------------------------------------------ |
| |
| // ------------------------------------------------------------------------ |
| // Use C style prototypes for all exported functions. This makes it easy |
| // to do dlsym lookups during libc initialization when hooks are enabled. |
| // ------------------------------------------------------------------------ |
| __BEGIN_DECLS |
| |
| bool hooks_initialize(const MallocDispatch* malloc_dispatch, bool* zygote_child, |
| const char* options); |
| void hooks_finalize(); |
| void hooks_get_malloc_leak_info( |
| uint8_t** info, size_t* overall_size, size_t* info_size, size_t* total_memory, |
| size_t* backtrace_size); |
| ssize_t hooks_malloc_backtrace(void* pointer, uintptr_t* frames, size_t frame_count); |
| void hooks_free_malloc_leak_info(uint8_t* info); |
| size_t hooks_malloc_usable_size(void* pointer); |
| void* hooks_malloc(size_t size); |
| int hooks_malloc_info(int options, FILE* fp); |
| void hooks_free(void* pointer); |
| void* hooks_memalign(size_t alignment, size_t bytes); |
| void* hooks_aligned_alloc(size_t alignment, size_t bytes); |
| void* hooks_realloc(void* pointer, size_t bytes); |
| void* hooks_calloc(size_t nmemb, size_t bytes); |
| struct mallinfo hooks_mallinfo(); |
| int hooks_mallopt(int param, int value); |
| int hooks_posix_memalign(void** memptr, size_t alignment, size_t size); |
| int hooks_malloc_iterate(uintptr_t base, size_t size, |
| void (*callback)(uintptr_t base, size_t size, void* arg), void* arg); |
| void hooks_malloc_disable(); |
| void hooks_malloc_enable(); |
| bool hooks_write_malloc_leak_info(FILE*); |
| |
| #if defined(HAVE_DEPRECATED_MALLOC_FUNCS) |
| void* hooks_pvalloc(size_t bytes); |
| void* hooks_valloc(size_t size); |
| #endif |
| |
| static void* default_malloc_hook(size_t bytes, const void*) { |
| return g_dispatch->malloc(bytes); |
| } |
| |
| static void* default_realloc_hook(void* pointer, size_t bytes, const void*) { |
| return g_dispatch->realloc(pointer, bytes); |
| } |
| |
| static void default_free_hook(void* pointer, const void*) { |
| g_dispatch->free(pointer); |
| } |
| |
| static void* default_memalign_hook(size_t alignment, size_t bytes, const void*) { |
| return g_dispatch->memalign(alignment, bytes); |
| } |
| |
| __END_DECLS |
| // ------------------------------------------------------------------------ |
| |
| bool hooks_initialize(const MallocDispatch* malloc_dispatch, bool*, const char*) { |
| g_dispatch = malloc_dispatch; |
| __malloc_hook = default_malloc_hook; |
| __realloc_hook = default_realloc_hook; |
| __free_hook = default_free_hook; |
| __memalign_hook = default_memalign_hook; |
| return true; |
| } |
| |
| void hooks_finalize() { |
| } |
| |
| void hooks_get_malloc_leak_info(uint8_t** info, size_t* overall_size, |
| size_t* info_size, size_t* total_memory, size_t* backtrace_size) { |
| *info = nullptr; |
| *overall_size = 0; |
| *info_size = 0; |
| *total_memory = 0; |
| *backtrace_size = 0; |
| } |
| |
| void hooks_free_malloc_leak_info(uint8_t*) { |
| } |
| |
| size_t hooks_malloc_usable_size(void* pointer) { |
| return g_dispatch->malloc_usable_size(pointer); |
| } |
| |
| void* hooks_malloc(size_t size) { |
| if (__malloc_hook != nullptr && __malloc_hook != default_malloc_hook) { |
| return __malloc_hook(size, __builtin_return_address(0)); |
| } |
| return g_dispatch->malloc(size); |
| } |
| |
| void hooks_free(void* pointer) { |
| if (__free_hook != nullptr && __free_hook != default_free_hook) { |
| return __free_hook(pointer, __builtin_return_address(0)); |
| } |
| return g_dispatch->free(pointer); |
| } |
| |
| void* hooks_memalign(size_t alignment, size_t bytes) { |
| if (__memalign_hook != nullptr && __memalign_hook != default_memalign_hook) { |
| return __memalign_hook(alignment, bytes, __builtin_return_address(0)); |
| } |
| return g_dispatch->memalign(alignment, bytes); |
| } |
| |
| void* hooks_realloc(void* pointer, size_t bytes) { |
| if (__realloc_hook != nullptr && __realloc_hook != default_realloc_hook) { |
| return __realloc_hook(pointer, bytes, __builtin_return_address(0)); |
| } |
| return g_dispatch->realloc(pointer, bytes); |
| } |
| |
| void* hooks_calloc(size_t nmemb, size_t bytes) { |
| if (__malloc_hook != nullptr && __malloc_hook != default_malloc_hook) { |
| size_t size; |
| if (__builtin_mul_overflow(nmemb, bytes, &size)) { |
| return nullptr; |
| } |
| void* ptr = __malloc_hook(size, __builtin_return_address(0)); |
| if (ptr != nullptr) { |
| memset(ptr, 0, size); |
| } |
| return ptr; |
| } |
| return g_dispatch->calloc(nmemb, bytes); |
| } |
| |
| struct mallinfo hooks_mallinfo() { |
| return g_dispatch->mallinfo(); |
| } |
| |
| int hooks_mallopt(int param, int value) { |
| return g_dispatch->mallopt(param, value); |
| } |
| |
| int hooks_malloc_info(int options, FILE* fp) { |
| return g_dispatch->malloc_info(options, fp); |
| } |
| |
| void* hooks_aligned_alloc(size_t alignment, size_t size) { |
| if (__memalign_hook != nullptr && __memalign_hook != default_memalign_hook) { |
| if (!powerof2(alignment) || (size % alignment) != 0) { |
| errno = EINVAL; |
| return nullptr; |
| } |
| void* ptr = __memalign_hook(alignment, size, __builtin_return_address(0)); |
| if (ptr == nullptr) { |
| errno = ENOMEM; |
| } |
| return ptr; |
| } |
| return g_dispatch->aligned_alloc(alignment, size); |
| } |
| |
| int hooks_posix_memalign(void** memptr, size_t alignment, size_t size) { |
| if (__memalign_hook != nullptr && __memalign_hook != default_memalign_hook) { |
| if (alignment < sizeof(void*) || !powerof2(alignment)) { |
| return EINVAL; |
| } |
| *memptr = __memalign_hook(alignment, size, __builtin_return_address(0)); |
| if (*memptr == nullptr) { |
| return ENOMEM; |
| } |
| return 0; |
| } |
| return g_dispatch->posix_memalign(memptr, alignment, size); |
| } |
| |
| int hooks_malloc_iterate(uintptr_t, size_t, void (*)(uintptr_t, size_t, void*), void*) { |
| return 0; |
| } |
| |
| void hooks_malloc_disable() { |
| } |
| |
| void hooks_malloc_enable() { |
| } |
| |
| ssize_t hooks_malloc_backtrace(void*, uintptr_t*, size_t) { |
| return 0; |
| } |
| |
| bool hooks_write_malloc_leak_info(FILE*) { |
| return true; |
| } |
| |
| #if defined(HAVE_DEPRECATED_MALLOC_FUNCS) |
| void* hooks_pvalloc(size_t bytes) { |
| size_t pagesize = getpagesize(); |
| size_t size = __BIONIC_ALIGN(bytes, pagesize); |
| if (size < bytes) { |
| // Overflow |
| errno = ENOMEM; |
| return nullptr; |
| } |
| return hooks_memalign(pagesize, size); |
| } |
| |
| void* hooks_valloc(size_t size) { |
| return hooks_memalign(getpagesize(), size); |
| } |
| #endif |