summaryrefslogtreecommitdiff
path: root/crypto
diff options
context:
space:
mode:
authorJussi Kivilinna <jussi.kivilinna@iki.fi>2013-03-28 19:54:03 (GMT)
committerHerbert Xu <herbert@gondor.apana.org.au>2013-04-02 09:56:15 (GMT)
commitd3dde52209ab571e4e2ec26c66f85ad1355f7475 (patch)
treeca1f749ba9eb9fb5e164c61d5b9ccb60a9a78aaf /crypto
parent246bbedb9aaf27e2207501d93a869023a439fce5 (diff)
downloadlinux-3.10-d3dde52209ab571e4e2ec26c66f85ad1355f7475.zip
linux-3.10-d3dde52209ab571e4e2ec26c66f85ad1355f7475.tar.gz
linux-3.10-d3dde52209ab571e4e2ec26c66f85ad1355f7475.tar.bz2
crypto: gcm - fix assumption that assoc has one segment
rfc4543(gcm(*)) code for GMAC assumes that assoc scatterlist always contains only one segment and only makes use of this first segment. However ipsec passes assoc with three segments when using 'extended sequence number' thus in this case rfc4543(gcm(*)) fails to function correctly. Patch fixes this issue. Reported-by: Chaoxing Lin <Chaoxing.Lin@ultra-3eti.com> Tested-by: Chaoxing Lin <Chaoxing.Lin@ultra-3eti.com> Cc: stable@vger.kernel.org Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/gcm.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/crypto/gcm.c b/crypto/gcm.c
index 137ad1e..13ccbda 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -44,6 +44,7 @@ struct crypto_rfc4543_ctx {
struct crypto_rfc4543_req_ctx {
u8 auth_tag[16];
+ u8 assocbuf[32];
struct scatterlist cipher[1];
struct scatterlist payload[2];
struct scatterlist assoc[2];
@@ -1133,9 +1134,19 @@ static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2);
assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
- sg_init_table(assoc, 2);
- sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
- req->assoc->offset);
+ if (req->assoc->length == req->assoclen) {
+ sg_init_table(assoc, 2);
+ sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
+ req->assoc->offset);
+ } else {
+ BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
+
+ scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
+ req->assoclen, 0);
+
+ sg_init_table(assoc, 2);
+ sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
+ }
scatterwalk_crypto_chain(assoc, payload, 0, 2);
aead_request_set_tfm(subreq, ctx->child);