1 /*
2 * Copyright (C) 2020 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 #define LOG_TAG "ApkVerityTestApp"
18
19 #include "jni.h"
20 #include <nativehelper/JNIHelp.h>
21 #include <nativehelper/ScopedUtfChars.h>
22
23 #include <android/log.h>
24
25 #include <errno.h>
26 #include <fcntl.h>
27 #include <linux/fs.h>
28 #include <sys/ioctl.h>
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <unistd.h>
32
33 #define ALOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
34
35 extern "C" JNIEXPORT jboolean JNICALL
Java_android_appsecurity_cts_apkveritytestapp_InstalledFilesCheck_hasFsverityNative(JNIEnv * env,jobject,jstring filePath)36 Java_android_appsecurity_cts_apkveritytestapp_InstalledFilesCheck_hasFsverityNative(
37 JNIEnv *env, jobject /*thiz*/, jstring filePath) {
38 ScopedUtfChars path(env, filePath);
39
40 // Call statx and check STATX_ATTR_VERITY.
41 struct statx out = {};
42 if (statx(AT_FDCWD, path.c_str(), 0 /* flags */, STATX_ALL, &out) != 0) {
43 ALOGE("statx failed at %s", path.c_str());
44 return JNI_FALSE;
45 }
46
47 if (out.stx_attributes_mask & STATX_ATTR_VERITY) {
48 return (out.stx_attributes & STATX_ATTR_VERITY) != 0 ? JNI_TRUE : JNI_FALSE;
49 }
50
51 // STATX_ATTR_VERITY is not supported by kernel for the file path.
52 // In this case, call ioctl(FS_IOC_GETFLAGS) and check FS_VERITY_FL.
53 int fd = open(path.c_str(), O_RDONLY | O_CLOEXEC);
54 if (fd < 0) {
55 ALOGE("failed to open %s", path.c_str());
56 return JNI_FALSE;
57 }
58
59 unsigned int flags;
60 int ret = ioctl(fd, FS_IOC_GETFLAGS, &flags);
61 close(fd);
62
63 if (ret < 0) {
64 ALOGE("ioctl(FS_IOC_GETFLAGS) failed at %s", path.c_str());
65 return JNI_FALSE;
66 }
67
68 return (flags & FS_VERITY_FL) != 0 ? JNI_TRUE : JNI_FALSE;
69 }
70