crypto: asymmetric_keys - prevent overflow in asymmetric_key_generate_id

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Use check_add_overflow() to guard against potential integer overflows
when adding the binary blob lengths and the size of an asymmetric_key_id
structure and return ERR_PTR(-EOVERFLOW) accordingly. This prevents a
possible buffer overflow when copying data from potentially malicious
X.509 certificate fields that can be arbitrarily large, such as ASN.1
INTEGER serial numbers, issuer names, etc.

Fixes: 7901c1a8ef ("KEYS: Implement binary asymmetric key ID handling")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Thorsten Blum 2025-10-13 13:40:10 +02:00 • committed by Greg Kroah-Hartman

parent 7e7135c842

commit c73be4f51e

1 changed files with 10 additions and 4 deletions

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crypto/asymmetric_keys/asymmetric_type.c

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