linux-kernel - [PATCH v2] infiniband: core: fix information leak to userspace

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Message-ID: <20101114092252.GA5323@albatros>
Date:	Sun, 14 Nov 2010 12:22:52 +0300
From:	Vasiliy Kulikov <segoon@...nwall.com>
To:	"Hefty, Sean" <sean.hefty@...el.com>
Cc:	Roland Dreier <rdreier@...co.com>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Roland Dreier <rolandd@...co.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Alex Chiang <achiang@...com>, Andi Kleen <ak@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Julia Lawall <julia@...u.dk>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] infiniband: core: fix information leak to userspace

ib_ucm_init_qp_attr() and ucma_init_qp_attr() pass struct ib_uverbs_qp_attr
with reserved, qp_state, {ah_attr,alt_ah_attr}{reserved,->grh.reserved}
fields uninitialized to copy_to_user().  It leads to leaking of contents of
kernel stack memory to userspace.

Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
---
 Compile tested.

 drivers/infiniband/core/uverbs_marshall.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/core/uverbs_marshall.c b/drivers/infiniband/core/uverbs_marshall.c
index 5440da0..1b1146f 100644
--- a/drivers/infiniband/core/uverbs_marshall.c
+++ b/drivers/infiniband/core/uverbs_marshall.c
@@ -40,18 +40,21 @@ void ib_copy_ah_attr_to_user(struct ib_uverbs_ah_attr *dst,
 	dst->grh.sgid_index        = src->grh.sgid_index;
 	dst->grh.hop_limit         = src->grh.hop_limit;
 	dst->grh.traffic_class     = src->grh.traffic_class;
+	memset(&dst->grh.reserved, 0, sizeof(dst->grh.reserved));
 	dst->dlid 	    	   = src->dlid;
 	dst->sl   	    	   = src->sl;
 	dst->src_path_bits 	   = src->src_path_bits;
 	dst->static_rate   	   = src->static_rate;
 	dst->is_global             = src->ah_flags & IB_AH_GRH ? 1 : 0;
 	dst->port_num 	    	   = src->port_num;
+	dst->reserved 		   = 0;
 }
 EXPORT_SYMBOL(ib_copy_ah_attr_to_user);
 
 void ib_copy_qp_attr_to_user(struct ib_uverbs_qp_attr *dst,
 			     struct ib_qp_attr *src)
 {
+	dst->qp_state	        = src->qp_state;
 	dst->cur_qp_state	= src->cur_qp_state;
 	dst->path_mtu		= src->path_mtu;
 	dst->path_mig_state	= src->path_mig_state;
@@ -83,6 +86,7 @@ void ib_copy_qp_attr_to_user(struct ib_uverbs_qp_attr *dst,
 	dst->rnr_retry		= src->rnr_retry;
 	dst->alt_port_num	= src->alt_port_num;
 	dst->alt_timeout	= src->alt_timeout;
+	memset(dst->reserved, 0, sizeof(dst->reserved));
 }
 EXPORT_SYMBOL(ib_copy_qp_attr_to_user);
 
-- 
1.7.0.4
--
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