linux-kernel - [PATCH 3/3] hpsa: avoid leaking stack contents to userland

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Message-ID: <20110107165553.14259.46247.stgit@beardog.cce.hp.com>
Date:	Fri, 07 Jan 2011 10:55:53 -0600
From:	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To:	james.bottomley@...senpartnership.com
Cc:	linux-scsi@...r.kernel.org, mike.miller@...com,
	linux-kernel@...r.kernel.org, thenzl@...hat.com,
	akpm@...ux-foundation.org, smcameron@...oo.com
Subject: [PATCH 3/3] hpsa: avoid leaking stack contents to userland

From: Vasiliy Kulikov <segooon@...il.com>

memset arg64 to zero in the passthrough ioctls to avoid leaking contents
of kernel stack memory to userland via uninitialized padding fields
inserted by the compiler for alignment reasons.

Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
---
 drivers/scsi/hpsa.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 5828bcb..959eeb2 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -2310,6 +2310,7 @@ static int hpsa_ioctl32_passthru(struct scsi_device *dev, int cmd, void *arg)
 	int err;
 	u32 cp;
 
+	memset(&arg64, 0, sizeof(arg64));
 	err = 0;
 	err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
 			   sizeof(arg64.LUN_info));
@@ -2346,6 +2347,7 @@ static int hpsa_ioctl32_big_passthru(struct scsi_device *dev,
 	int err;
 	u32 cp;
 
+	memset(&arg64, 0, sizeof(arg64));
 	err = 0;
 	err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
 			   sizeof(arg64.LUN_info));

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