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fs-verity: support reading signature with ioctl

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Add support for FS_VERITY_METADATA_TYPE_SIGNATURE to
FS_IOC_READ_VERITY_METADATA.  This allows a userspace server program to
retrieve the built-in signature (if present) of a verity file for
serving to a client which implements fs-verity compatible verification.
See the patch which introduced FS_IOC_READ_VERITY_METADATA for more
details.

The ability for userspace to read the built-in signatures is also useful
because it allows a system that is using the in-kernel signature
verification to migrate to userspace signature verification.

This has been tested using a new xfstest which calls this ioctl via a
new subcommand for the 'fsverity' program from fsverity-utils.

Link: https://lore.kernel.org/r/20210115181819.34732-7-ebiggers@kernel.org
Reviewed-by: Victor Hsieh <victorhsieh@google.com>
Reviewed-by: Jaegeuk Kim <jaegeuk@kernel.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers
2021-01-15 10:18:19 -08:00
committed by Jaegeuk Kim
parent 67c2d4aa2e
commit 5f4d2c15ba
3 changed files with 39 additions and 1 deletions
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include/uapi/linux/fsverity.h
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@@ -85,6 +85,7 @@ struct fsverity_formatted_digest {
#define FS_VERITY_METADATA_TYPE_MERKLE_TREE 1
#define FS_VERITY_METADATA_TYPE_DESCRIPTOR 2
#define FS_VERITY_METADATA_TYPE_SIGNATURE 3
struct fsverity_read_metadata_arg {
__u64 metadata_type;