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https://git.suyu.dev/suyu/breakpad.git
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561f818735
This patch makes two changes to breakpad to enable crash reporting to work correctly when the library is inside another file (an archive): - Do not filter mappings which map an executable at a non-zero offset. - If such an executable is mapped look in the ELF information for the shared object name and use that name in the minidump. Note this change doesn't care about the archive format and isn't Android specific (though loading the shared library this way is currently only done on Android). BUG=390618 R=thestig@chromium.org Review URL: https://breakpad.appspot.com/7684002 Patch from Anton Carver <anton@chromium.org>. git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1355 4c0a9323-5329-0410-9bdc-e9ce6186880e
113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
// Copyright (c) 2011, Google Inc.
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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 are
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// met:
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//
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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
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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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 FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// memory_mapped_file.cc: Implement google_breakpad::MemoryMappedFile.
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// See memory_mapped_file.h for details.
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#include "common/linux/memory_mapped_file.h"
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#include <fcntl.h>
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#include <sys/mman.h>
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#if defined(__ANDROID__)
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#include <sys/stat.h>
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#endif
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#include <unistd.h>
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#include "common/memory_range.h"
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#include "third_party/lss/linux_syscall_support.h"
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namespace google_breakpad {
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MemoryMappedFile::MemoryMappedFile() {}
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MemoryMappedFile::MemoryMappedFile(const char* path, size_t offset) {
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Map(path, offset);
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}
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MemoryMappedFile::~MemoryMappedFile() {
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Unmap();
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}
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bool MemoryMappedFile::Map(const char* path, size_t offset) {
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Unmap();
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int fd = sys_open(path, O_RDONLY, 0);
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if (fd == -1) {
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return false;
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}
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#if defined(__x86_64__) || defined(__aarch64__)
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struct kernel_stat st;
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if (sys_fstat(fd, &st) == -1 || st.st_size < 0) {
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#else
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struct kernel_stat64 st;
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if (sys_fstat64(fd, &st) == -1 || st.st_size < 0) {
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#endif
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sys_close(fd);
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return false;
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}
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// Strangely file size can be negative, but we check above that it is not.
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size_t file_len = static_cast<size_t>(st.st_size);
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// If the file does not extend beyond the offset, simply use an empty
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// MemoryRange and return true. Don't bother to call mmap()
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// even though mmap() can handle an empty file on some platforms.
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if (offset >= file_len) {
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sys_close(fd);
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return true;
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}
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#if defined(__x86_64__) || defined(__aarch64__)
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void* data = sys_mmap(NULL, file_len, PROT_READ, MAP_PRIVATE, fd, offset);
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#else
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if ((offset & 4095) != 0) {
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// Not page aligned.
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sys_close(fd);
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return false;
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}
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void* data = sys_mmap2(
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NULL, file_len, PROT_READ, MAP_PRIVATE, fd, offset >> 12);
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#endif
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sys_close(fd);
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if (data == MAP_FAILED) {
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return false;
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}
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content_.Set(data, file_len - offset);
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return true;
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}
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void MemoryMappedFile::Unmap() {
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if (content_.data()) {
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sys_munmap(const_cast<uint8_t*>(content_.data()), content_.length());
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content_.Set(NULL, 0);
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}
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}
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} // namespace google_breakpad
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