mirror of
https://chromium.googlesource.com/crosvm/crosvm
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4f9f5c7479
Add support for FS_IOC_{GET,SET}_ENCRYPTION_POLICY. Unfortunately,
since the I/O direction is encoded backwards in the ioctl definitions,
these will only work with on a kernel that's compiled with a patch to
mark them as unrestricted FUSE ioctls.
BUG=b:136127632
TEST=Compile and run the vfs_crypto.c program on a virtio-fs mount
inside a VM
Change-Id: I124c5a943111b453dd44921a079a2baa1036dfd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1952570
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: Chirantan Ekbote <chirantan@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
// Copyright 2019 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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extern char* program_invocation_short_name;
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int main(int argc, char** argv) {
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if (argc != 2) {
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printf("Usage: %s <path_to_directory>\n", program_invocation_short_name);
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return 1;
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}
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int dir = open(argv[1], O_DIRECTORY | O_CLOEXEC);
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if (dir < 0) {
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perror("Failed to open directory");
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return 1;
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}
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struct fscrypt_policy policy;
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int ret = ioctl(dir, FS_IOC_GET_ENCRYPTION_POLICY, &policy);
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if (ret < 0) {
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perror("FS_IOC_GET_ENCRYPTION_POLICY failed");
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return 1;
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}
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printf("File system encryption policy:\n");
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printf("\tversion = %#x\n", policy.version);
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printf("\tcontents_encryption_mode = %#x\n", policy.contents_encryption_mode);
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printf("\tfilenames_encryption_mode = %#x\n",
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policy.filenames_encryption_mode);
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printf("\tflags = %#x\n", policy.flags);
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printf("\tmaster_key_descriptor = 0x");
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for (int i = 0; i < FS_KEY_DESCRIPTOR_SIZE; ++i) {
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printf("%x", policy.master_key_descriptor[i]);
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}
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printf("\n");
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ret = ioctl(dir, FS_IOC_SET_ENCRYPTION_POLICY, &policy);
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if (ret < 0) {
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perror("FS_IOC_SET_ENCRYPTION_POLICY failed");
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return 1;
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}
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return 0;
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}
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