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xfs: prevent reading uninitialized stack memory 

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@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dan Rosenberg 2010-09-06 18:24:57 -04:00 committed by Alex Elder
parent cc491e27d3
commit a122eb2fdf
1 changed files with 2 additions and 0 deletions
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2
fs/xfs/linux-2.6/xfs_ioctl.c
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@ -785,6 +785,8 @@ 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;