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--- sandbox/policy/freebsd/sandbox_freebsd.cc.orig 2023-05-05 12:12:41 UTC
+++ sandbox/policy/freebsd/sandbox_freebsd.cc
@@ -0,0 +1,245 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sandbox/policy/freebsd/sandbox_freebsd.h"
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <limits>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/command_line.h"
+#include "base/debug/stack_trace.h"
+#include "base/feature_list.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/files/scoped_file.h"
+#include "base/logging.h"
+#include "base/memory/singleton.h"
+#include "base/path_service.h"
+#include "base/posix/eintr_wrapper.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/system/sys_info.h"
+#include "base/threading/thread.h"
+#include "base/time/time.h"
+#include "build/build_config.h"
+#include "crypto/crypto_buildflags.h"
+#include "ppapi/buildflags/buildflags.h"
+#include "sandbox/constants.h"
+#include "sandbox/linux/services/credentials.h"
+#include "sandbox/linux/services/namespace_sandbox.h"
+#include "sandbox/linux/services/proc_util.h"
+#include "sandbox/linux/services/resource_limits.h"
+#include "sandbox/linux/services/thread_helpers.h"
+#include "sandbox/linux/syscall_broker/broker_command.h"
+#include "sandbox/linux/syscall_broker/broker_process.h"
+#include "sandbox/policy/sandbox.h"
+#include "sandbox/policy/sandbox_type.h"
+#include "sandbox/policy/mojom/sandbox.mojom.h"
+#include "sandbox/policy/switches.h"
+#include "sandbox/sandbox_buildflags.h"
+
+#if BUILDFLAG(USING_SANITIZER)
+#include <sanitizer/common_interface_defs.h>
+#endif
+
+#if BUILDFLAG(USE_NSS_CERTS)
+#include "crypto/nss_util.h"
+#endif
+
+#include "third_party/boringssl/src/include/openssl/crypto.h"
+
+#include "ui/gfx/font_util.h"
+
+namespace sandbox {
+namespace policy {
+
+SandboxLinux::SandboxLinux()
+ : sandbox_status_flags_(kInvalid),
+ pre_initialized_(false),
+ initialize_sandbox_ran_(false),
+ broker_process_(nullptr) {
+}
+
+SandboxLinux::~SandboxLinux() {
+ if (pre_initialized_) {
+ CHECK(initialize_sandbox_ran_);
+ }
+}
+
+SandboxLinux* SandboxLinux::GetInstance() {
+ SandboxLinux* instance = base::Singleton<SandboxLinux>::get();
+ CHECK(instance);
+ return instance;
+}
+
+void SandboxLinux::StopThread(base::Thread* thread) {
+ DCHECK(thread);
+ thread->Stop();
+}
+
+void SandboxLinux::PreinitializeSandbox(sandbox::mojom::Sandbox sandbox_type) {
+ CHECK(!pre_initialized_);
+#if BUILDFLAG(USING_SANITIZER)
+ // Sanitizers need to open some resources before the sandbox is enabled.
+ // This should not fork, not launch threads, not open a directory.
+ __sanitizer_sandbox_on_notify(sanitizer_args());
+ sanitizer_args_.reset();
+#endif
+ base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+ const std::string process_type =
+ command_line->GetSwitchValueASCII(switches::kProcessType);
+
+ base::SysInfo::AmountOfPhysicalMemory();
+ base::SysInfo::NumberOfProcessors();
+ base::SysInfo::CPUModelName();
+
+ switch (sandbox_type) {
+ case sandbox::mojom::Sandbox::kNoSandbox:
+ {
+#if BUILDFLAG(USE_NSS_CERTS)
+ // The main process has to initialize the ~/.pki dir which won't work
+ // after unveil(2).
+ crypto::EnsureNSSInit();
+#endif
+ CRYPTO_pre_sandbox_init();
+
+ base::FilePath cache_directory, local_directory;
+
+ base::PathService::Get(base::DIR_CACHE, &cache_directory);
+ base::PathService::Get(base::DIR_HOME, &local_directory);
+
+ cache_directory = cache_directory.AppendASCII("ungoogled-chromium");
+ local_directory = local_directory.AppendASCII(".local").AppendASCII("share").AppendASCII("applications");
+
+ if (!base::CreateDirectory(cache_directory)) {
+ LOG(ERROR) << "Failed to create " << cache_directory.value() << " directory.";
+ }
+
+ if (!base::CreateDirectory(local_directory)) {
+ LOG(ERROR) << "Failed to create " << local_directory.value() << " directory.";
+ }
+
+ break;
+ }
+ case sandbox::mojom::Sandbox::kRenderer:
+ gfx::InitializeFonts();
+ break;
+ default:
+ break;
+ }
+
+ pre_initialized_ = true;
+}
+
+bool SandboxLinux::InitializeSandbox(sandbox::mojom::Sandbox sandbox_type,
+ SandboxLinux::PreSandboxHook hook,
+ const Options& options) {
+ DCHECK(!initialize_sandbox_ran_);
+ initialize_sandbox_ran_ = true;
+
+ base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+ const std::string process_type =
+ command_line->GetSwitchValueASCII(switches::kProcessType);
+
+ if (command_line->HasSwitch(switches::kNoSandbox))
+ return true;
+
+ VLOG(1) << "SandboxLinux::InitializeSandbox: process_type="
+ << process_type << " sandbox_type=" << GetSandboxTypeInEnglish(sandbox_type);
+
+ // Only one thread is running, pre-initialize if not already done.
+ if (!pre_initialized_)
+ PreinitializeSandbox(sandbox_type);
+
+ // Attempt to limit the future size of the address space of the process.
+ int error = 0;
+ const bool limited_as = LimitAddressSpace(&error);
+ if (error) {
+ // Restore errno. Internally to |LimitAddressSpace|, the errno due to
+ // setrlimit may be lost.
+ errno = error;
+ PCHECK(limited_as);
+ }
+
+ if (hook)
+ CHECK(std::move(hook).Run(options));
+
+ return true;
+}
+
+bool SandboxLinux::LimitAddressSpace(int* error) {
+#if !defined(ADDRESS_SANITIZER) && !defined(MEMORY_SANITIZER) && \
+ !defined(THREAD_SANITIZER) && !defined(LEAK_SANITIZER)
+ base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+ if (SandboxTypeFromCommandLine(*command_line) == sandbox::mojom::Sandbox::kNoSandbox) {
+ return false;
+ }
+
+ // Unfortunately, it does not appear possible to set RLIMIT_AS such that it
+ // will both (a) be high enough to support V8's and WebAssembly's address
+ // space requirements while also (b) being low enough to mitigate exploits
+ // using integer overflows that require large allocations, heap spray, or
+ // other memory-hungry attack modes.
+
+ *error = sandbox::ResourceLimits::Lower(
+ RLIMIT_DATA, static_cast<rlim_t>(sandbox::kDataSizeLimit));
+
+ // Cache the resource limit before turning on the sandbox.
+ base::SysInfo::AmountOfVirtualMemory();
+ base::SysInfo::MaxSharedMemorySize();
+
+ return *error == 0;
+#else
+ base::SysInfo::AmountOfVirtualMemory();
+ return false;
+#endif // !defined(ADDRESS_SANITIZER) && !defined(MEMORY_SANITIZER) &&
+ // !defined(THREAD_SANITIZER) && !defined(LEAK_SANITIZER)
+}
+
+// static
+std::string SandboxLinux::GetSandboxTypeInEnglish(sandbox::mojom::Sandbox sandbox_type) {
+ switch (sandbox_type) {
+ case sandbox::mojom::Sandbox::kNoSandbox:
+ return "Unsandboxed";
+ case sandbox::mojom::Sandbox::kRenderer:
+ return "Renderer";
+ case sandbox::mojom::Sandbox::kUtility:
+ return "Utility";
+ case sandbox::mojom::Sandbox::kGpu:
+ return "GPU";
+#if BUILDFLAG(ENABLE_PPAPI)
+ case sandbox::mojom::Sandbox::kPpapi:
+ return "PPAPI";
+#endif
+ case sandbox::mojom::Sandbox::kNetwork:
+ return "Network";
+ case sandbox::mojom::Sandbox::kCdm:
+ return "CDM";
+ case sandbox::mojom::Sandbox::kPrintCompositor:
+ return "Print Compositor";
+ case sandbox::mojom::Sandbox::kAudio:
+ return "Audio";
+ case sandbox::mojom::Sandbox::kSpeechRecognition:
+ return "Speech Recognition";
+ case sandbox::mojom::Sandbox::kService:
+ return "Service";
+ case sandbox::mojom::Sandbox::kVideoCapture:
+ return "Video Capture";
+ default:
+ return "Unknown";
+ }
+}
+
+} // namespace policy
+} // namespace sandbox
|
