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The extra_memory_ranges stored in the intermediate dump and used by gwp-asan via the ProcessSnapshot are not needed in the minidump. If this memory were stored in the minidump with gwp-asan, this would double the size of every iOS minidump. Instead, add a second bag that is stored in the intermediate dump but not written to the minidump. Expose an iOS only ProcessSnapshot API that can be used by the gwp-asan analyzer to use the extra_memory_ranges without increasing the minidump file size. Change-Id: Ibf7b7fb89cda0a829727c02e5118dc2f6423769f Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/6351477 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Justin Cohen <justincohen@chromium.org>
195 lines
6.7 KiB
C++
195 lines
6.7 KiB
C++
// Copyright 2014 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "client/crashpad_info.h"
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#include <type_traits>
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#include "base/numerics/safe_conversions.h"
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#include "build/build_config.h"
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#include "util/misc/address_sanitizer.h"
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#include "util/misc/from_pointer_cast.h"
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#if BUILDFLAG(IS_APPLE)
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#include <mach-o/loader.h>
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#endif
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namespace {
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// Don’t change this when simply adding fields. Readers will size-check the
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// structure and ignore fields they’re aware of when not present, as well as
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// fields they’re not aware of. Only change this when introducing an
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// incompatible layout, with the understanding that existing readers will not
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// understand new versions.
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constexpr uint32_t kCrashpadInfoVersion = 1;
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// Creates a `UserDataMinidumpStreamListEntry` with the given fields, and
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// returns a pointer to it. The caller takes ownership of the returned object.
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crashpad::internal::UserDataMinidumpStreamListEntry* CreateListEntry(
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uint64_t next,
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uint32_t stream_type,
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const void* data,
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size_t size) {
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auto to_be_added = new crashpad::internal::UserDataMinidumpStreamListEntry();
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to_be_added->next = next;
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to_be_added->stream_type = stream_type;
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to_be_added->base_address = crashpad::FromPointerCast<uint64_t>(data);
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to_be_added->size = base::checked_cast<uint64_t>(size);
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return to_be_added;
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}
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} // namespace
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namespace crashpad {
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static_assert(std::is_standard_layout<CrashpadInfo>::value,
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"CrashpadInfo must be standard layout");
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// This structure needs to be stored somewhere that is easy to find without
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// external information.
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//
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// It isn’t placed in an unnamed namespace: hopefully, this will catch attempts
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// to place multiple copies of this structure into the same module. If that’s
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// attempted, and the name of the symbol is the same in each translation unit,
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// it will result in a linker error, which is better than having multiple
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// structures show up.
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//
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// This may result in a static module initializer in debug-mode builds, but
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// because it’s POD, no code should need to run to initialize this under
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// release-mode optimization.
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#if BUILDFLAG(IS_POSIX)
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__attribute__((
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#if BUILDFLAG(IS_APPLE)
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// Put the structure in a well-known section name where it can be easily
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// found without having to consult the symbol table.
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section(SEG_DATA ",crashpad_info"),
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#endif
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#if defined(ADDRESS_SANITIZER)
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// AddressSanitizer would add a trailing red zone of at least 32 bytes,
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// which would be reflected in the size of the custom section. This confuses
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// MachOImageReader::GetCrashpadInfo(), which finds that the section’s size
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// disagrees with the structure’s size_ field. By specifying an alignment
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// greater than the red zone size, the red zone will be suppressed.
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aligned(64),
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#endif // defined(ADDRESS_SANITIZER)
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// There's no need to expose this as a public symbol from the symbol table.
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// All accesses from the outside can locate the well-known section name.
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visibility("hidden"),
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// The “used” attribute prevents the structure from being dead-stripped.
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used))
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#elif BUILDFLAG(IS_WIN)
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// Put the struct in a section name CPADinfo where it can be found without the
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// symbol table.
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#pragma section("CPADinfo", read, write)
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__declspec(allocate("CPADinfo"))
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#else // !BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_WIN)
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#error Port
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#endif // !BUILDFLAG(IS_POSIX) && !BUILDFLAG(IS_WIN)
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CrashpadInfo g_crashpad_info;
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extern "C" int* CRASHPAD_NOTE_REFERENCE;
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// static
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CrashpadInfo* CrashpadInfo::GetCrashpadInfo() {
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#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID) || \
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BUILDFLAG(IS_FUCHSIA)
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// This otherwise-unused reference is used so that any module that
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// references GetCrashpadInfo() will also include the note in the
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// .note.crashpad.info section. That note in turn contains the address of
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// g_crashpad_info. This allows the module reader to find the CrashpadInfo
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// structure without requiring the use of the dynamic symbol table.
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static volatile int* pointer_to_note_section = CRASHPAD_NOTE_REFERENCE;
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(void)pointer_to_note_section;
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#endif
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return &g_crashpad_info;
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}
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CrashpadInfo::CrashpadInfo()
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: signature_(kSignature),
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size_(sizeof(*this)),
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version_(kCrashpadInfoVersion),
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indirectly_referenced_memory_cap_(0),
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padding_0_(0),
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crashpad_handler_behavior_(TriState::kUnset),
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system_crash_reporter_forwarding_(TriState::kUnset),
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gather_indirectly_referenced_memory_(TriState::kUnset),
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padding_1_(0),
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extra_memory_ranges_(nullptr),
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simple_annotations_(nullptr),
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user_data_minidump_stream_head_(nullptr),
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annotations_list_(nullptr)
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#if BUILDFLAG(IS_IOS)
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,
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intermediate_dump_extra_memory_ranges_(nullptr)
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#endif
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{
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}
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UserDataMinidumpStreamHandle* CrashpadInfo::AddUserDataMinidumpStream(
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uint32_t stream_type,
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const void* data,
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size_t size) {
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user_data_minidump_stream_head_ = CreateListEntry(
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crashpad::FromPointerCast<uint64_t>(user_data_minidump_stream_head_),
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stream_type,
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data,
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size);
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return user_data_minidump_stream_head_;
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}
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UserDataMinidumpStreamHandle* CrashpadInfo::UpdateUserDataMinidumpStream(
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UserDataMinidumpStreamHandle* stream_to_update,
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uint32_t stream_type,
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const void* data,
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size_t size) {
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// Create a new stream that points to the node `stream_to_update` points to.
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const auto new_stream =
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CreateListEntry(stream_to_update->next, stream_type, data, size);
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// If `stream_to_update` is head of the list, replace the head with
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// `new_stream`.
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if (stream_to_update == user_data_minidump_stream_head_) {
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user_data_minidump_stream_head_ = new_stream;
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} else {
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// Otherwise, find the node before `stream_to_update`, and make it point to
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// `new_stream` instead.
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auto current = user_data_minidump_stream_head_;
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while (current) {
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auto next = reinterpret_cast<internal::UserDataMinidumpStreamListEntry*>(
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current->next);
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if (next == stream_to_update) {
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current->next = FromPointerCast<uint64_t>(new_stream);
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break;
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}
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current = next;
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}
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CHECK(current)
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<< "Tried to update a UserDataMinidumpStream that doesn't exist";
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}
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delete stream_to_update;
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return new_stream;
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}
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} // namespace crashpad
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