netdev - [PATCH] Integer overflow in RDS cmsg handling

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Date:	Wed, 17 Nov 2010 11:37:16 -0500
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	andy.grover@...cle.com
Cc:	netdev@...r.kernel.org, security@...nel.org
Subject: [PATCH] Integer overflow in RDS cmsg handling

In rds_cmsg_rdma_args(), the user-provided args->nr_local value is
restricted to less than UINT_MAX.  This seems to need a tighter upper
bound, since the calculation of total iov_size can overflow, resulting
in a small sock_kmalloc() allocation.  This would probably just result
in walking off the heap and crashing when calling rds_rdma_pages() with
a high count value.  If it somehow doesn't crash here, then memory
corruption could occur soon after.

Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>
---
 net/rds/rdma.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 8920f2a..0a969f6 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -567,7 +567,7 @@ int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
 		goto out;
 	}

-	if (args->nr_local > (u64)UINT_MAX) {
+	if (args->nr_local > (u64)UIO_MAXIOV) {
 		ret = -EMSGSIZE;
 		goto out;
 	}

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