Index: sandbox/linux/services/namespace_sandbox.cc |
diff --git a/sandbox/linux/services/namespace_sandbox.cc b/sandbox/linux/services/namespace_sandbox.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..559b93c7e6e19621fdf8e363fddb2ab69f1f42bd |
--- /dev/null |
+++ b/sandbox/linux/services/namespace_sandbox.cc |
@@ -0,0 +1,112 @@ |
+// Copyright 2015 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/linux/services/namespace_sandbox.h" |
+ |
+#include <sched.h> |
+#include <stdlib.h> |
+#include <sys/types.h> |
+#include <unistd.h> |
+ |
+#include <string> |
+#include <utility> |
+ |
+#include "base/command_line.h" |
+#include "base/environment.h" |
+#include "base/files/scoped_file.h" |
+#include "base/logging.h" |
+#include "base/posix/eintr_wrapper.h" |
+#include "base/process/launch.h" |
+#include "base/process/process.h" |
+#include "sandbox/linux/services/namespace_utils.h" |
+ |
+namespace sandbox { |
+ |
+namespace { |
+ |
+class WriteUidGidMapDelegate : public base::LaunchOptions::PreExecDelegate { |
+ public: |
+ WriteUidGidMapDelegate() : uid_(getuid()), gid_(getgid()) {} |
+ |
+ ~WriteUidGidMapDelegate() override {} |
+ |
+ void RunAsyncSafe() override { |
+ RAW_CHECK(NamespaceUtils::WriteToIdMapFile("/proc/self/uid_map", uid_)); |
+ RAW_CHECK(NamespaceUtils::WriteToIdMapFile("/proc/self/gid_map", gid_)); |
+ } |
+ |
+ private: |
+ uid_t uid_; |
+ gid_t gid_; |
+ DISALLOW_COPY_AND_ASSIGN(WriteUidGidMapDelegate); |
+}; |
+ |
+void SetEnvironForNamespaceType(base::EnvironmentMap* environ, |
+ base::NativeEnvironmentString env_var, |
+ bool value) { |
+ // An empty string causes the env var to be unset in the child process. |
+ (*environ)[env_var] = value ? "1" : ""; |
+} |
+ |
+const char kSandboxUSERNSEnvironmentVarName[] = "SBX_USER_NS"; |
+const char kSandboxPIDNSEnvironmentVarName[] = "SBX_PID_NS"; |
+const char kSandboxNETNSEnvironmentVarName[] = "SBX_NET_NS"; |
+ |
+} // namespace |
+ |
+// static |
+base::Process NamespaceSandbox::LaunchProcess( |
+ const base::CommandLine& cmdline, |
+ const base::LaunchOptions& options) { |
+ int clone_flags = 0; |
+ int ns_types[] = {CLONE_NEWUSER, CLONE_NEWPID, CLONE_NEWNET}; |
+ for (const int ns_type : ns_types) { |
+ if (NamespaceUtils::KernelSupportsUnprivilegedNamespace(ns_type)) { |
+ clone_flags |= ns_type; |
+ } |
+ } |
+ CHECK(clone_flags & CLONE_NEWUSER); |
+ |
+ // These fields may not be set by the caller. |
+ CHECK(options.pre_exec_delegate == nullptr); |
+ CHECK_EQ(0, options.clone_flags); |
+ |
+ WriteUidGidMapDelegate write_uid_gid_map_delegate; |
+ |
+ base::LaunchOptions launch_options = options; |
+ launch_options.pre_exec_delegate = &write_uid_gid_map_delegate; |
+ launch_options.clone_flags = clone_flags; |
+ |
+ const std::pair<int, const char*> clone_flag_environ[] = { |
+ std::make_pair(CLONE_NEWUSER, kSandboxUSERNSEnvironmentVarName), |
+ std::make_pair(CLONE_NEWPID, kSandboxPIDNSEnvironmentVarName), |
+ std::make_pair(CLONE_NEWNET, kSandboxNETNSEnvironmentVarName), |
+ }; |
+ |
+ base::EnvironmentMap* environ = &launch_options.environ; |
+ for (const auto& entry : clone_flag_environ) { |
+ const int flag = entry.first; |
+ const char* environ_name = entry.second; |
+ SetEnvironForNamespaceType(environ, environ_name, clone_flags & flag); |
+ } |
+ |
+ return base::LaunchProcess(cmdline, launch_options); |
+} |
+ |
+// static |
+bool NamespaceSandbox::InNewUserNamespace() { |
+ return getenv(kSandboxUSERNSEnvironmentVarName) != nullptr; |
+} |
+ |
+// static |
+bool NamespaceSandbox::InNewPidNamespace() { |
+ return getenv(kSandboxPIDNSEnvironmentVarName) != nullptr; |
+} |
+ |
+// static |
+bool NamespaceSandbox::InNewNetNamespace() { |
+ return getenv(kSandboxNETNSEnvironmentVarName) != nullptr; |
+} |
+ |
+} // namespace sandbox |