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

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Message-Id: <1289054481-18145-1-git-send-email-segooon@gmail.com>
Date:	Sat,  6 Nov 2010 17:41:20 +0300
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Roland Dreier <rolandd@...co.com>,
	Sean Hefty <sean.hefty@...el.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-kernel@...r.kernel.org
Subject: [PATCH] infiniband: core: fix information leak to userland

Structure ib_uverbs_qp_attr is copied to userland with allmost all
fields uninitialized (140 bytes on x86).  It leads to leaking of
contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 Compile tested.

 drivers/infiniband/core/ucm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
index 08f948d..ccfa4f9 100644
--- a/drivers/infiniband/core/ucm.c
+++ b/drivers/infiniband/core/ucm.c
@@ -622,7 +622,7 @@ static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
 
-	resp.qp_attr_mask = 0;
+	memset(&resp, 0, sizeof(resp));
 	memset(&qp_attr, 0, sizeof qp_attr);
 	qp_attr.qp_state = cmd.qp_state;
 	result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
-- 
1.7.0.4

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