gecko-dev/mozglue/build/AsanOptions.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Attributes.h"
#ifndef _MSC_VER // Not supported by clang-cl yet
// When running with AddressSanitizer, we need to explicitly set some
// options specific to our codebase to prevent errors during runtime.
// To override these, set the ASAN_OPTIONS environment variable.
//
// Currently, these are:
//
// allow_user_segv_handler=1 - Tell ASan to allow our code to use its
// own SIGSEGV handlers. This is required by ASM.js internally.
//
// alloc_dealloc_mismatch=0 - Disable alloc-dealloc mismatch checking
// in ASan. This is required because we define our own new/delete
// operators that are backed by malloc/free. If one of them gets inlined
// while the other doesn't, ASan will report false positives.
//
// detect_leaks=0 - Disable LeakSanitizer. This is required because
// otherwise leak checking will be enabled for various building and
// testing executables where we don't care much about leaks. Enabling
// this will also likely require setting LSAN_OPTIONS with a suppression
// file, as in build/sanitizers/lsan_suppressions.txt.
//
// allocator_may_return_null=1 - Tell ASan to return NULL when an allocation
// fails instead of aborting the program. This allows us to handle failing
// allocations the same way we would handle them with a regular allocator and
// also uncovers potential bugs that might occur in these situations.
//
// max_malloc_fill_size - Tell ASan to initialize memory to a certain value
// when it is allocated. This option specifies the maximum allocation size
// for which ASan should still initialize the memory. The value we specify
// here is exactly 256MiB.
//
// max_free_fill_size - Similar to max_malloc_fill_size, tell ASan to
// overwrite memory with a certain value when it is freed. Again, the value
// here specifies the maximum allocation size, larger allocations will
// skipped.
//
// malloc_fill_byte / free_fill_byte - These values specify the byte values
// used to initialize/overwrite memory in conjunction with the previous
// options max_malloc_fill_size and max_free_fill_size. The values used here
// are 0xe4 and 0xe5 to match the kAllocPoison and kAllocJunk constants used
// by mozjemalloc.
//
// malloc_context_size - This value specifies how many stack frames are
// stored for each malloc and free call. Since Firefox can have lots of deep
// stacks with allocations, we limit the default size here further to save
// some memory.
//
extern "C" MOZ_ASAN_BLACKLIST const char* __asan_default_options() {
return "allow_user_segv_handler=1:alloc_dealloc_mismatch=0:detect_leaks=0"
# ifdef MOZ_ASAN_REPORTER
":malloc_context_size=20"
# endif
":max_free_fill_size=268435456:max_malloc_fill_size=268435456"
":malloc_fill_byte=228:free_fill_byte=229"
":handle_sigill=1"
":allocator_may_return_null=1";
}
#endif