1 /*
2  * Copyright (C) 2024 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "host/commands/process_sandboxer/policies.h"
18 
19 #include <sys/prctl.h>
20 
21 #include "sandboxed_api/sandbox2/policybuilder.h"
22 #include "sandboxed_api/sandbox2/util/bpf_helper.h"
23 #include "sandboxed_api/util/path.h"
24 
25 using sapi::file::JoinPath;
26 
27 namespace cuttlefish {
28 
LogcatReceiverPolicy(const HostInfo & host)29 sandbox2::PolicyBuilder LogcatReceiverPolicy(const HostInfo& host) {
30   auto exe = JoinPath(host.artifacts_path, "bin", "logcat_receiver");
31   auto lib64 = JoinPath(host.artifacts_path, "lib64");
32   return sandbox2::PolicyBuilder()
33       .AddDirectory(lib64)
34       .AddDirectory(host.log_dir, /* is_ro= */ false)
35       .AddFile(host.cuttlefish_config_path)
36       .AddLibrariesForBinary(exe, lib64)
37       // For dynamic linking
38       .AddPolicyOnSyscall(__NR_prctl,
39                           {ARG_32(0), JEQ32(PR_CAPBSET_READ, ALLOW)})
40       .AllowDynamicStartup()
41       .AllowExit()
42       .AllowGetPIDs()
43       .AllowGetRandom()
44       .AllowHandleSignals()
45       .AllowMmap()
46       .AllowOpen()
47       .AllowRead()
48       .AllowReadlink()
49       .AllowRestartableSequences(sandbox2::PolicyBuilder::kAllowSlowFences)
50       .AllowSafeFcntl()
51       .AllowSyscall(__NR_tgkill)
52       .AllowWrite();
53 }
54 
55 }  // namespace cuttlefish
56