1 //
2 // Copyright (C) 2023 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 #include "kernel_module_parser.h"
17
18 #include <fcntl.h>
19 #include "common/libs/fs/shared_fd.h"
20
21 static constexpr std::string_view SIGNATURE_FOOTER =
22 "~Module signature appended~\n";
23
24 namespace cuttlefish {
25
IsKernelModuleSigned(const char * path)26 bool IsKernelModuleSigned(const char *path) {
27 auto fd = SharedFD::Open(path, O_RDONLY);
28 fd->LSeek(-SIGNATURE_FOOTER.size(), SEEK_END);
29 std::array<char, SIGNATURE_FOOTER.size()> buf{};
30 fd->Read(buf.data(), buf.size());
31
32 return memcmp(buf.data(), SIGNATURE_FOOTER.data(), SIGNATURE_FOOTER.size()) ==
33 0;
34 }
35
36 } // namespace cuttlefish