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c7fe30dddb
Add pid->handle mapping code to generate_dump. This is enough to get generate_dump to start capturing a dump for an arbitrary system process. It currently CHECK()s in ProcessSnapshotFuchsia on some unimplemented functionality. Bug: crashpad:196 Change-Id: Idfbaa4fbf32af63ad6db5b0b78a7a1991b82728e Reviewed-on: https://chromium-review.googlesource.com/1005804 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Scott Graham <scottmg@chromium.org>
137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
// Copyright 2018 The Crashpad Authors. All rights reserved.
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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 "util/fuchsia/koid_utilities.h"
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#include <zircon/device/sysinfo.h>
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#include <vector>
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#include "base/files/file_path.h"
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#include "base/fuchsia/fuchsia_logging.h"
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#include "util/file/file_io.h"
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namespace crashpad {
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namespace {
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base::ScopedZxHandle GetRootJob() {
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ScopedFileHandle sysinfo(
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LoggingOpenFileForRead(base::FilePath("/dev/misc/sysinfo")));
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if (!sysinfo.is_valid())
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return base::ScopedZxHandle();
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zx_handle_t root_job;
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size_t n = ioctl_sysinfo_get_root_job(sysinfo.get(), &root_job);
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if (n != sizeof(root_job)) {
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LOG(ERROR) << "unexpected root job size";
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return base::ScopedZxHandle();
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}
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return base::ScopedZxHandle(root_job);
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}
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std::vector<zx_koid_t> GetChildKoids(zx_handle_t parent, uint32_t child_kind) {
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constexpr size_t kNumExtraKoids = 10u;
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size_t actual = 0;
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size_t available = 0;
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std::vector<zx_koid_t> result;
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// This is inherently racy, but we retry with a bit of slop to try to get a
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// complete list.
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for (int pass = 0; pass < 5; pass++) {
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if (actual <= available)
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result.resize(available + kNumExtraKoids);
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zx_status_t status = zx_object_get_info(parent,
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child_kind,
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result.data(),
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result.size() * sizeof(zx_koid_t),
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&actual,
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&available);
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if (actual == available) {
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break;
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}
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if (status != ZX_OK) {
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ZX_LOG(ERROR, status) << "zx_object_get_info";
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break;
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}
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}
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result.resize(actual);
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return result;
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}
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// type can be ZX_INFO_JOB_CHILDREN or ZX_INFO_JOB_PROCESSES.
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std::vector<base::ScopedZxHandle> GetChildObjects(
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const base::ScopedZxHandle& job,
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zx_object_info_topic_t type) {
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auto koids = GetChildKoids(job.get(), type);
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std::vector<base::ScopedZxHandle> result;
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result.reserve(koids.size());
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for (zx_koid_t koid : koids) {
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zx_handle_t handle;
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if (zx_object_get_child(job.get(), koid, ZX_RIGHT_SAME_RIGHTS, &handle) ==
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ZX_OK)
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result.push_back(base::ScopedZxHandle(handle));
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}
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return result;
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}
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bool FindProcess(const base::ScopedZxHandle& job,
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zx_koid_t koid,
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base::ScopedZxHandle* out) {
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for (auto& proc : GetChildObjects(job, ZX_INFO_JOB_PROCESSES)) {
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if (GetKoidForHandle(proc.get()) == koid) {
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*out = std::move(proc);
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return true;
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}
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}
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for (const auto& child_job : GetChildObjects(job, ZX_INFO_JOB_CHILDREN)) {
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if (FindProcess(child_job, koid, out))
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return true;
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}
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return false;
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}
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} // namespace
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zx_koid_t GetKoidForHandle(zx_handle_t object) {
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zx_info_handle_basic_t info;
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zx_status_t status = zx_object_get_info(
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object, ZX_INFO_HANDLE_BASIC, &info, sizeof(info), nullptr, nullptr);
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if (status != ZX_OK) {
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ZX_LOG(ERROR, status) << "zx_object_get_info";
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return ZX_HANDLE_INVALID;
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}
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return info.koid;
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}
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// TODO(scottmg): This implementation uses some debug/temporary/hacky APIs and
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// ioctls that are currently the only way to go from pid to handle. This should
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// hopefully eventually be replaced by more or less a single
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// zx_debug_something() syscall.
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base::ScopedZxHandle GetProcessFromKoid(zx_koid_t koid) {
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base::ScopedZxHandle result;
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if (!FindProcess(GetRootJob(), koid, &result)) {
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LOG(ERROR) << "process " << koid << " not found";
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}
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return result;
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}
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} // namespace crashpad
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