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 <linux/filter.h>
20 #include <sys/mman.h>
21 #include <syscall.h>
22
23 #include <vector>
24
25 #include <sandboxed_api/sandbox2/policybuilder.h>
26 #include <sandboxed_api/sandbox2/util/bpf_helper.h>
27
28 namespace cuttlefish::process_sandboxer {
29
Simg2ImgPolicy(const HostInfo & host)30 sandbox2::PolicyBuilder Simg2ImgPolicy(const HostInfo& host) {
31 return BaselinePolicy(host, host.HostToolExe("simg2img"))
32 .AddDirectory(host.guest_image_path, /* is_ro= */ false)
33 .AddPolicyOnMmap([](bpf_labels& labels) -> std::vector<sock_filter> {
34 return {
35 ARG_32(2), // prot
36 JNE32(PROT_READ, JUMP(&labels, cf_simg2img_mmap_end)),
37 ARG_32(3), // flags
38 JEQ32(MAP_SHARED, ALLOW),
39 LABEL(&labels, cf_simg2img_mmap_end),
40 };
41 })
42 .AllowSyscall(__NR_ftruncate);
43 }
44
45 } // namespace cuttlefish::process_sandboxer
46