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fsverity: explicitly check that there is no algorithm 0

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Since libfsverity and some other code would break if 0 is ever allocated
as an FS_VERITY_HASH_ALG_* value, make fsverity_check_hash_algs()
explicitly check that there is no algorithm 0.

Link: https://lore.kernel.org/r/20230705211719.37713-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2023-07-05 14:17:19 -07:00
parent 06c2afb862
commit 5d37a11980
1 changed files with 8 additions and 0 deletions
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8
fs/verity/hash_algs.c
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@ -226,6 +226,14 @@ void __init fsverity_check_hash_algs(void)
if (!alg->name)
continue;
/*
* 0 must never be allocated as an FS_VERITY_HASH_ALG_* value,
* as it is reserved for users that use 0 to mean unspecified or
* a default value. fs/verity/ itself doesn't care and doesn't
* have a default algorithm, but some users make use of this.
*/
BUG_ON(i == 0);
BUG_ON(alg->digest_size > FS_VERITY_MAX_DIGEST_SIZE);
/*