From: Herbert Xu Date: Fri, 16 Jan 2015 08:51:20 +0000 (+1100) Subject: crypto: seqiv - Ensure that IV size is at least 8 bytes X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c0ecf8916d28e99fd072514f19fd36ee42a6ad7e;p=linux-beck.git crypto: seqiv - Ensure that IV size is at least 8 bytes Since seqiv is designed for IPsec we need to be able to accomodate the whole IPsec sequence number in order to ensure the uniqueness of the IV. This patch forbids any algorithm with an IV size of less than 8 from using it. This should have no impact on existing users since they all have an IV size of 8. Reported-by: Maciej ?enczykowski Signed-off-by: Herbert Xu Acked-by: Maciej ?enczykowski --- diff --git a/crypto/seqiv.c b/crypto/seqiv.c index 9daa854cc485..b7bb9a2f4a31 100644 --- a/crypto/seqiv.c +++ b/crypto/seqiv.c @@ -267,6 +267,12 @@ static struct crypto_instance *seqiv_ablkcipher_alloc(struct rtattr **tb) if (IS_ERR(inst)) goto out; + if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64)) { + skcipher_geniv_free(inst); + inst = ERR_PTR(-EINVAL); + goto out; + } + inst->alg.cra_ablkcipher.givencrypt = seqiv_givencrypt_first; inst->alg.cra_init = seqiv_init; @@ -287,6 +293,12 @@ static struct crypto_instance *seqiv_aead_alloc(struct rtattr **tb) if (IS_ERR(inst)) goto out; + if (inst->alg.cra_aead.ivsize < sizeof(u64)) { + aead_geniv_free(inst); + inst = ERR_PTR(-EINVAL); + goto out; + } + inst->alg.cra_aead.givencrypt = seqiv_aead_givencrypt_first; inst->alg.cra_init = seqiv_aead_init;