Eric Biggers b6c9d04019 fsverity: skip PKCS#7 parser when keyring is empty ... commit 919dc320956ea353a7fb2d84265195ad5ef525ac upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-09-23 10:59:55 +02:00
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enable.c
fsverity_private.h
hash_algs.c
init.c
Kconfig
Makefile
measure.c
open.c
signature.c	fsverity: skip PKCS#7 parser when keyring is empty	2023-09-23 10:59:55 +02:00
verify.c