diff options
| author | Dan Rosenberg <dan.j.rosenberg@gmail.com> | 2010-09-06 18:24:57 -0400 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-01-06 18:08:02 -0500 |
| commit | 3c8d8bedf37054493323a6ae402fe538032e37a1 (patch) | |
| tree | c5bc3dff173f7a42fad6de9ec6a201e9f5c48235 | |
| parent | dd1644658bbefe2626a5307e90c009720bd62623 (diff) | |
xfs: prevent reading uninitialized stack memory
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@gmail.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_ioctl.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_ioctl.c b/fs/xfs/linux-2.6/xfs_ioctl.c index 7b26cc2fd28..3da1da77c30 100644 --- a/fs/xfs/linux-2.6/xfs_ioctl.c +++ b/fs/xfs/linux-2.6/xfs_ioctl.c @@ -791,6 +791,8 @@ 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; |