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authorHerbert Xu <herbert@gondor.apana.org.au>2015-06-22 10:14:19 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2015-06-22 15:49:30 +0800
commit15539de5c958d4943cc2f2f35f7e313bff5922b6 (patch)
treeb1534509e5e6f08737bc23da9eb690a34e75141f /crypto
parent9fcc704dfd7967ebfbdd1031603e4332a905994b (diff)
downloadlinux-stericsson-15539de5c958d4943cc2f2f35f7e313bff5922b6.tar.gz
crypto: af_alg - Forbid the use internal algorithms
The bit CRYPTO_ALG_INTERNAL was added to stop af_alg from accessing internal algorithms. However, af_alg itself was never modified to actually stop that bit from being used by the user. Therefore the user could always override it by specifying the relevant bit in the type and/or mask. This patch silently discards the bit in both type and mask. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/af_alg.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index f22cc56fd1b3..2bc180e02115 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -127,6 +127,7 @@ EXPORT_SYMBOL_GPL(af_alg_release);
static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
+ const u32 forbidden = CRYPTO_ALG_INTERNAL;
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct sockaddr_alg *sa = (void *)uaddr;
@@ -151,7 +152,9 @@ static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
if (IS_ERR(type))
return PTR_ERR(type);
- private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask);
+ private = type->bind(sa->salg_name,
+ sa->salg_feat & ~forbidden,
+ sa->salg_mask & ~forbidden);
if (IS_ERR(private)) {
module_put(type->owner);
return PTR_ERR(private);