From: Herbert Xu Date: Fri, 11 Jan 2008 09:32:51 +0000 (-0800) Subject: IPSEC: Avoid undefined shift operation when testing algorithm ID X-Git-Tag: v2.6.23.15~50 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d7ebea7d9e242d5eb968c9512d323f15c3894e20;p=thirdparty%2Fkernel%2Fstable.git IPSEC: Avoid undefined shift operation when testing algorithm ID [IPSEC]: Avoid undefined shift operation when testing algorithm ID [ Upstream commit: f398035f2dec0a6150833b0bc105057953594edb ] The aalgos/ealgos fields are only 32 bits wide. However, af_key tries to test them with the expression 1 << id where id can be as large as 253. This produces different behaviour on different architectures. The following patch explicitly checks whether ID is greater than 31 and fails the check if that's the case. We cannot easily extend the mask to be longer than 32 bits due to exposure to user-space. Besides, this whole interface is obsolete anyway in favour of the xfrm_user interface which doesn't use this bit mask in templates (well not within the kernel anyway). Signed-off-by: Herbert Xu Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/key/af_key.c b/net/key/af_key.c index 7a5e9933ace16..9c75b9ece6d52 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -2780,12 +2780,22 @@ static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) { - return t->aalgos & (1 << d->desc.sadb_alg_id); + unsigned int id = d->desc.sadb_alg_id; + + if (id >= sizeof(t->aalgos) * 8) + return 0; + + return (t->aalgos >> id) & 1; } static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) { - return t->ealgos & (1 << d->desc.sadb_alg_id); + unsigned int id = d->desc.sadb_alg_id; + + if (id >= sizeof(t->ealgos) * 8) + return 0; + + return (t->ealgos >> id) & 1; } static int count_ah_combs(struct xfrm_tmpl *t)