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From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
To: netdev@vger.kernel.org
Cc: linux-sctp@vger.kernel.org,
	Ilja Van Sprundel <ivansprundel@ioactive.com>,
	Neil Horman <nhorman@tuxdriver.com>,
	Vlad Yasevich <vyasevich@gmail.com>,
	Xin Long <lucien.xin@gmail.com>
Subject: [PATCH net 4/4] sctp: add param size validation for SCTP_PARAM_SET_PRIMARY
Date: Mon, 28 Jun 2021 16:13:44 -0300	[thread overview]
Message-ID: <e39b372644b6e5bf48df25e54b9172f34ec223a1.1624904195.git.marcelo.leitner@gmail.com> (raw)
In-Reply-To: <cover.1624904195.git.marcelo.leitner@gmail.com>

When SCTP handles an INIT chunk, it calls for example:
sctp_sf_do_5_1B_init
  sctp_verify_init
    sctp_verify_param
  sctp_process_init
    sctp_process_param
      handling of SCTP_PARAM_SET_PRIMARY

sctp_verify_init() wasn't doing proper size validation and neither the
later handling, allowing it to work over the chunk itself, possibly being
uninitialized memory.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
---
 net/sctp/sm_make_chunk.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index f33a870b483da7123e2ddb4473b6200a1aca5ade..587fb3cb88e29f53148cd21f13a2a86487ce292b 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2166,9 +2166,16 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
 		break;
 
 	case SCTP_PARAM_SET_PRIMARY:
-		if (ep->asconf_enable)
-			break;
-		goto unhandled;
+		if (!ep->asconf_enable)
+			goto unhandled;
+
+		if (ntohs(param.p->length) < sizeof(struct sctp_addip_param) +
+					     sizeof(struct sctp_paramhdr)) {
+			sctp_process_inv_paramlength(asoc, param.p,
+						     chunk, err_chunk);
+			retval = SCTP_IERROR_ABORT;
+		}
+		break;
 
 	case SCTP_PARAM_HOST_NAME_ADDRESS:
 		/* Tell the peer, we won't support this param.  */
-- 
2.31.1


  parent reply	other threads:[~2021-06-28 19:13 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-28 19:13 [PATCH net 0/4] sctp: add some size validations Marcelo Ricardo Leitner
2021-06-28 19:13 ` [PATCH net 1/4] sctp: validate from_addr_param return Marcelo Ricardo Leitner
2021-07-27  2:20   ` Ben Hutchings
2021-07-27 15:10     ` Marcelo Ricardo Leitner
2021-06-28 19:13 ` [PATCH net 2/4] sctp: add size validation when walking chunks Marcelo Ricardo Leitner
2021-06-28 19:13 ` [PATCH net 3/4] sctp: validate chunk size in __rcv_asconf_lookup Marcelo Ricardo Leitner
2021-06-28 19:13 ` Marcelo Ricardo Leitner [this message]
2021-06-28 22:40 ` [PATCH net 0/4] sctp: add some size validations patchwork-bot+netdevbpf

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