linux/fs/verity
Eric Biggers 919dc32095 fsverity: skip PKCS#7 parser when keyring is empty
If an fsverity builtin signature is given for a file but the
".fs-verity" keyring is empty, there's no real reason to run the PKCS#7
parser.  Skip this to avoid the PKCS#7 attack surface when builtin
signature support is configured into the kernel but is not being used.

This is a hardening improvement, not a fix per se, but I've added
Fixes and Cc stable to get it out to more users.

Fixes: 432434c9f8 ("fs-verity: support builtin file signatures")
Cc: stable@vger.kernel.org
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lore.kernel.org/r/20230820173237.2579-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
2023-08-20 10:33:43 -07:00
..
enable.c fsverity: improve documentation for builtin signature support 2023-06-20 22:47:55 -07:00
fsverity_private.h fsverity: move sysctl registration out of signature.c 2023-07-11 22:57:03 -07:00
hash_algs.c fsverity: explicitly check that there is no algorithm 0 2023-07-11 22:49:18 -07:00
init.c fsverity: move sysctl registration out of signature.c 2023-07-11 22:57:03 -07:00
Kconfig fsverity: improve documentation for builtin signature support 2023-06-20 22:47:55 -07:00
Makefile fs-verity: add FS_IOC_READ_VERITY_METADATA ioctl 2021-02-07 14:51:11 -08:00
measure.c fsverity: rework fsverity_get_digest() again 2023-06-14 10:41:07 -07:00
open.c fsverity: simplify handling of errors during initcall 2023-07-11 22:49:18 -07:00
read_metadata.c fsverity: improve documentation for builtin signature support 2023-06-20 22:47:55 -07:00
signature.c fsverity: skip PKCS#7 parser when keyring is empty 2023-08-20 10:33:43 -07:00
verify.c fsverity: simplify handling of errors during initcall 2023-07-11 22:49:18 -07:00