From 313e7b4d2588539e388d31c1febd50503a0083fc Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Tue, 17 Jan 2006 11:55:57 -0800 Subject: [PATCH] [SCTP]: Fix machine check/connection hang on IA64. sctp_unpack_cookie used an on-stack array called digest as a result/out parameter in the call to crypto_hmac. However, hmac code (crypto_hmac_final) assumes that the 'out' argument is in virtual memory (identity mapped region) and can use virt_to_page call on it. This does not work with the on-stack declared digest. The problems observed so far have been: a) incorrect hmac digest b) machine check and hardware reset. Solution is to define the digest in an identity mapped region by kmalloc'ing it. We can do this once as part of the endpoint structure and re-use it when verifying the SCTP cookie. Signed-off-by: Vlad Yasevich Signed-off-by: Sridhar Samudrala --- include/net/sctp/structs.h | 8 ++++++++ net/sctp/sm_make_chunk.c | 2 +- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index ad3d15cb0a..8c522ae031 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -1250,6 +1250,14 @@ struct sctp_endpoint { int last_key; int key_changed_at; + /* digest: This is a digest of the sctp cookie. This field is + * only used on the receive path when we try to validate + * that the cookie has not been tampered with. We put + * this here so we pre-allocate this once and can re-use + * on every receive. + */ + __u8 digest[SCTP_SIGNATURE_SIZE]; + /* sendbuf acct. policy. */ __u32 sndbuf_policy; diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 4fe1d6c863..5e0de3c0ee 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -1359,7 +1359,7 @@ struct sctp_association *sctp_unpack_cookie( struct sctp_signed_cookie *cookie; struct sctp_cookie *bear_cookie; int headersize, bodysize, fixed_size; - __u8 digest[SCTP_SIGNATURE_SIZE]; + __u8 *digest = ep->digest; struct scatterlist sg; unsigned int keylen, len; char *key; -- 2.39.5