linux-kernel - [39/68] xfs: prevent reading uninitialized stack memory

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Date:	Fri, 24 Sep 2010 09:32:03 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	Alex Elder <aelder@....com>, dann frazier <dannf@...ian.org>
Subject: [39/68] xfs: prevent reading uninitialized stack memory

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Dan Rosenberg <dan.j.rosenberg@...il.com>

commit a122eb2fdfd78b58c6dd992d6f4b1aaef667eef9 upstream.

The XFS_IOC_FSGETXATTR ioctl allows unprivileged users to read 12
bytes of uninitialized stack memory, because the fsxattr struct
declared on the stack in xfs_ioc_fsgetxattr() does not alter (or zero)
the 12-byte fsx_pad member before copying it back to the user.  This
patch takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
Reviewed-by: Eric Sandeen <sandeen@...hat.com>
Signed-off-by: Alex Elder <aelder@....com>
Cc: dann frazier <dannf@...ian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/xfs/linux-2.6/xfs_ioctl.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/xfs/linux-2.6/xfs_ioctl.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -789,6 +789,8 @@ xfs_ioc_fsgetxattr(
 {
 	struct fsxattr		fa;
 
+	memset(&fa, 0, sizeof(struct fsxattr));
+
 	xfs_ilock(ip, XFS_ILOCK_SHARED);
 	fa.fsx_xflags = xfs_ip2xflags(ip);
 	fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog;


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