f3968e89cb
This patch introduces GWP-ASan - a sampled allocator framework that finds use-after-free and heap-buffer-overflow bugs in production environments. GWP-ASan is being introduced in an always-disabled mode. This means that GWP-ASan will be permanently disabled until a further patch turns on support. As such, there should be no visible functional change for the time being. GWP-ASan requires -fno-emulated-tls wherever it's linked from. We intentionally link GWP-ASan into libc so that it's part of the initial set of libraries, and thus has static TLS storage (so we can use Initial-Exec TLS instead of Global-Dynamic). As a benefit, this reduces overhead for a sampled process. GWP-ASan is always initialised via. a call to mallopt(M_INITIALIZE_GWP_ASAN, which must be done before a process is multithreaded). More information about GWP-ASan can be found in the upstream documentation: http://llvm.org/docs/GwpAsan.html Bug: 135634846 Test: atest bionic Change-Id: Ib9bd33337d17dab39ac32f4536bff71bd23498b0
96 lines
3.3 KiB
C
96 lines
3.3 KiB
C
/*
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* Copyright (C) 2019 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <stdatomic.h>
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#include <stdio.h>
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#include <async_safe/log.h>
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#include <private/bionic_globals.h>
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#include <private/bionic_malloc_dispatch.h>
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#if __has_feature(hwaddress_sanitizer)
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#include <sanitizer/hwasan_interface.h>
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__BEGIN_DECLS
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// FIXME: implement these in HWASan allocator.
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int __sanitizer_malloc_iterate(uintptr_t base, size_t size,
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void (*callback)(uintptr_t base, size_t size, void* arg),
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void* arg);
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void __sanitizer_malloc_disable();
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void __sanitizer_malloc_enable();
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int __sanitizer_malloc_info(int options, FILE* fp);
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__END_DECLS
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#define Malloc(function) __sanitizer_ ## function
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#else // __has_feature(hwaddress_sanitizer)
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#if defined(USE_SCUDO)
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#include "scudo.h"
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#define Malloc(function) scudo_ ## function
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#elif defined(USE_SCUDO_SVELTE)
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#include "scudo.h"
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#define Malloc(function) scudo_svelte_ ## function
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#else
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#include "jemalloc.h"
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#define Malloc(function) je_ ## function
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#endif
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#endif
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const MallocDispatch* NativeAllocatorDispatch();
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static inline const MallocDispatch* GetDispatchTable() {
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return atomic_load_explicit(&__libc_globals->current_dispatch_table, memory_order_acquire);
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}
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static inline const MallocDispatch* GetDefaultDispatchTable() {
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return atomic_load_explicit(&__libc_globals->default_dispatch_table, memory_order_acquire);
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}
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// =============================================================================
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// Log functions
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// =============================================================================
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#define error_log(format, ...) \
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async_safe_format_log(ANDROID_LOG_ERROR, "libc", (format), ##__VA_ARGS__ )
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#define info_log(format, ...) \
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async_safe_format_log(ANDROID_LOG_INFO, "libc", (format), ##__VA_ARGS__ )
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#define warning_log(format, ...) \
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async_safe_format_log(ANDROID_LOG_WARN, "libc", (format), ##__VA_ARGS__ )
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// =============================================================================
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