8b70a0266d
Changes
- Refactor the code so that only guards require creating a special header
for every pointer allocated.
- Store only a single copy of every backtrace. This saves memory so that
turning on the backtrace option doesn't result in 10X memory usage.
- Added new option track_allocs that only verifies pointers are valid for
free/malloc_usable_size/realloc.
- Remove suffix from test names.
- Add the TRACK_ALLOCS options to all guard options.
- Add new option verify_pointers that is a lightweight way to verify
pointers that are passed to allocation routines.
- Do auto-formatting of the code.
- Updated documentation for all of these changes.
Bug: 74361929
Test: Ran unit tests.
Test: Ran libmemunreachable unit tests.
Test: Ran an app with backtrace enabled.
Change-Id: I3246c48ae4f9811f64622d90d0a9b4d9d818702c
(cherry picked from commit 4da2503d70)
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
/*
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* Copyright (C) 2015 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 <stdint.h>
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#include <private/bionic_malloc_dispatch.h>
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// Allocations that require a header include a variable length header.
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// This is the order that data structures will be found. If an optional
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// part of the header does not exist, the other parts of the header
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// will still be in this order.
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// Header (Required)
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// uint8_t data (Optional: Front guard, will be a multiple of MINIMUM_ALIGNMENT_BYTES)
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// allocation data
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// uint8_t data (Optional: End guard)
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//
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// In the initialization function, offsets into the header will be set
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// for each different header location. The offsets are always from the
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// beginning of the Header section.
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struct Header {
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uint32_t tag;
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void* orig_pointer;
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size_t size;
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size_t usable_size;
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} __attribute__((packed));
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struct BacktraceHeader {
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size_t num_frames;
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uintptr_t frames[0];
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} __attribute__((packed));
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constexpr uint32_t DEBUG_TAG = 0x1ee7d00d;
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constexpr uint32_t DEBUG_FREE_TAG = 0x1cc7dccd;
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constexpr char LOG_DIVIDER[] = "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***";
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constexpr size_t FREE_TRACK_MEM_BUFFER_SIZE = 4096;
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extern const MallocDispatch* g_dispatch;
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