linux-kernel - [PATCH] prevent CVE-2012-2372 rds-ping causes kernel panic

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Message-ID: <20121022181253.GA13736@redhat.com>
Date:	Mon, 22 Oct 2012 14:12:54 -0400
From:	Jay Fenlason <fenlason@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org
Cc:	stable@...r.kernel.org
Subject: [PATCH] prevent CVE-2012-2372 rds-ping causes kernel panic

If you use rds-ping of the local IP address of some Infiniband HCAs
(QLogic, possibly others) the machine will panic with a BUG_ON due to
an overly restrictive check.  Loosen the restriction a bit

This should have gotten sent a while ago (it was first noticed in
 https://bugzilla.redhat.com/show_bug.cgi?id=803936
and patched in kernel-2.6.32-275.el6) but I got confused about its
embargo status and lost it.

Signed-off-by: Jay Fenlason <fenlason@...hat.com>

diff --git a/net/rds/ib_send.c b/net/rds/ib_send.c
index e590949..7920c85 100644
--- a/net/rds/ib_send.c
+++ b/net/rds/ib_send.c
@@ -544,7 +544,7 @@ int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 	int flow_controlled = 0;
 	int nr_sig = 0;
 
-	BUG_ON(off % RDS_FRAG_SIZE);
+	BUG_ON(!conn->c_loopback && off % RDS_FRAG_SIZE);
 	BUG_ON(hdr_off != 0 && hdr_off != sizeof(struct rds_header));
 
 	/* Do not send cong updates to IB loopback */
--
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