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/*
* Copyright (C) 2019 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 <stdlib.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/prctl.h>
#include "platform/bionic/macros.h"
#include "scudo.h"
// Disable Scudo's mismatch allocation check, as it is being triggered
// by some third party code.
extern "C" const char *__scudo_default_options() {
return "DeallocationTypeMismatch=false";
}
static inline bool AllocTooBig(size_t bytes) {
#if defined(__LP64__)
if (__predict_false(bytes > 0x10000000000ULL)) {
#else
if (__predict_false(bytes > 0x80000000ULL)) {
#endif
return true;
}
return false;
}
void* scudo_aligned_alloc(size_t alignment, size_t size) {
if (alignment == 0 || !powerof2(alignment) || (size % alignment) != 0) {
errno = EINVAL;
return nullptr;
}
if (AllocTooBig(size)) {
errno = ENOMEM;
return nullptr;
}
return aligned_alloc(alignment, size);
}
void* scudo_calloc(size_t item_count, size_t item_size) {
size_t total;
if (__builtin_mul_overflow(item_count, item_size, &total) || AllocTooBig(total)) {
errno = ENOMEM;
return nullptr;
}
return calloc(item_count, item_size);
}
void scudo_free(void* ptr) {
free(ptr);
}
extern "C" size_t __sanitizer_get_current_allocated_bytes();
extern "C" size_t __sanitizer_get_heap_size();
struct mallinfo scudo_mallinfo() {
struct mallinfo info {};
info.uordblks = __sanitizer_get_current_allocated_bytes();
info.hblkhd = __sanitizer_get_heap_size();
info.usmblks = info.hblkhd;
return info;
}
void* scudo_malloc(size_t byte_count) {
if (AllocTooBig(byte_count)) {
errno = ENOMEM;
return nullptr;
}
return malloc(byte_count);
}
size_t scudo_malloc_usable_size(const void* ptr) {
return malloc_usable_size(ptr);
}
void* scudo_memalign(size_t alignment, size_t byte_count) {
if (AllocTooBig(byte_count)) {
errno = ENOMEM;
return nullptr;
}
if (alignment != 0) {
if (!powerof2(alignment)) {
alignment = BIONIC_ROUND_UP_POWER_OF_2(alignment);
}
} else {
alignment = 1;
}
return memalign(alignment, byte_count);
}
void* scudo_realloc(void* ptr, size_t byte_count) {
if (AllocTooBig(byte_count)) {
errno = ENOMEM;
return nullptr;
}
return realloc(ptr, byte_count);
}
int scudo_posix_memalign(void** memptr, size_t alignment, size_t size) {
if (alignment < sizeof(void*) || !powerof2(alignment)) {
return EINVAL;
}
if (AllocTooBig(size)) {
return ENOMEM;
}
return posix_memalign(memptr, alignment, size);
}
#if defined(HAVE_DEPRECATED_MALLOC_FUNCS)
extern "C" void* pvalloc(size_t);
void* scudo_pvalloc(size_t size) {
if (AllocTooBig(size)) {
errno = ENOMEM;
return nullptr;
}
return pvalloc(size);
}
extern "C" void* valloc(size_t);
void* scudo_valloc(size_t size) {
if (AllocTooBig(size)) {
errno = ENOMEM;
return nullptr;
}
return valloc(size);
}
#endif
// Do not try and name the scudo maps by overriding __sanitizer::internal_mmap.
// There is already a function called MmapNamed that names the maps.
// Unfortunately, there is no easy way to override MmapNamed because
// too much of the code is not compiled into functions available in the
// library, and the code is complicated.
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