[lucid, lucid/fsl-imx51, maverick, maverick/ti-omap4 CVE 1/1] xfs: Fix possible memory corruption in xfs_readlink

Andy Whitcroft apw at canonical.com
Mon Nov 21 16:50:54 UTC 2011

From: Carlos Maiolino <cmaiolino at redhat.com>

Fixes a possible memory corruption when the link is larger than
MAXPATHLEN and XFS_DEBUG is not enabled. This also remove the
S_ISLNK assert, since the inode mode is checked previously in
xfs_readlink_by_handle() and via VFS.

Updated to address concerns raised by Ben Hutchings about the loose
attention paid to 32- vs 64-bit values, and the lack of handling a
potentially negative pathlen value:
 - Changed type of "pathlen" to be xfs_fsize_t, to match that of
 - Added checking for a negative pathlen to the too-long pathlen
   test, and generalized the message that gets reported in that case
   to reflect the change
As a result, if a negative pathlen were encountered, this function
would return EFSCORRUPTED (and would fail an assertion for a debug
build)--just as would a too-long pathlen.

Signed-off-by: Alex Elder <aelder at sgi.com>
Signed-off-by: Carlos Maiolino <cmaiolino at redhat.com>
Reviewed-by: Christoph Hellwig <hch at lst.de>

(backported from commit b52a360b2aa1c59ba9970fb0f52bbb093fcc7a24)
BugLink: http://bugs.launchpad.net/bugs/887298
Signed-off-by: Andy Whitcroft <apw at canonical.com>
 fs/xfs/xfs_vnodeops.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 8f32f50..e55752f 100644
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -554,7 +554,7 @@ xfs_readlink(
 	char		*link)
 	xfs_mount_t	*mp = ip->i_mount;
-	int		pathlen;
+	xfs_fsize_t	pathlen;
 	int		error = 0;
@@ -564,13 +564,19 @@ xfs_readlink(
 	xfs_ilock(ip, XFS_ILOCK_SHARED);
-	ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK);
-	ASSERT(ip->i_d.di_size <= MAXPATHLEN);
 	pathlen = ip->i_d.di_size;
 	if (!pathlen)
 		goto out;
+	if (pathlen < 0 || pathlen > MAXPATHLEN) {
+		cmn_err(CE_ALERT, "%s: inode (%llu) bad symlink length (%lld)",
+			 __func__, (unsigned long long) ip->i_ino,
+			 (long long) pathlen);
+		ASSERT(0);
+	}
 	if (ip->i_df.if_flags & XFS_IFINLINE) {
 		memcpy(link, ip->i_df.if_u1.if_data, pathlen);
 		link[pathlen] = '\0';

More information about the kernel-team mailing list