linux-stable

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History

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: 432434c9f8e1 ("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