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authorDavid Chinner <dgc@sgi.com>2006-09-28 11:06:03 +1000
committerTim Shimmin <tes@sgi.com>2006-09-28 11:06:03 +1000
commitf273ab848b7cbc0088b0ac7457b3769e6566074e (patch)
tree27f1b0ce7b056f77e7105284524cbdb658943ae5 /fs/xfs/xfs_inode.c
parent01106eae97b70399ce5a273a3cceb5246e8d9cc8 (diff)
downloadlinux-f273ab848b7cbc0088b0ac7457b3769e6566074e.tar.bz2
[XFS] Really fix use after free in xfs_iunpin.
The previous attempts to fix the linux inode use-after-free in xfs_iunpin simply made the problem harder to hit. We actually need complete exclusion between xfs_reclaim and xfs_iunpin, as well as ensuring that the i_flags are consistent during both of these functions. Introduce a new spinlock for exclusion and the i_flags, and fix up xfs_iunpin to use igrab before marking the inode dirty. SGI-PV: 952967 SGI-Modid: xfs-linux-melb:xfs-kern:26964a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_inode.c')
-rw-r--r--fs/xfs/xfs_inode.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 66a78287a957..c27d7d495aa0 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -867,6 +867,7 @@ xfs_iread(
ip = kmem_zone_zalloc(xfs_inode_zone, KM_SLEEP);
ip->i_ino = ino;
ip->i_mount = mp;
+ spin_lock_init(&ip->i_flags_lock);
/*
* Get pointer's to the on-disk inode and the buffer containing it.
@@ -2214,7 +2215,9 @@ xfs_ifree_cluster(
if (ip == free_ip) {
if (xfs_iflock_nowait(ip)) {
+ spin_lock(&ip->i_flags_lock);
ip->i_flags |= XFS_ISTALE;
+ spin_unlock(&ip->i_flags_lock);
if (xfs_inode_clean(ip)) {
xfs_ifunlock(ip);
@@ -2228,7 +2231,9 @@ xfs_ifree_cluster(
if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
if (xfs_iflock_nowait(ip)) {
+ spin_lock(&ip->i_flags_lock);
ip->i_flags |= XFS_ISTALE;
+ spin_unlock(&ip->i_flags_lock);
if (xfs_inode_clean(ip)) {
xfs_ifunlock(ip);
@@ -2258,7 +2263,9 @@ xfs_ifree_cluster(
AIL_LOCK(mp,s);
iip->ili_flush_lsn = iip->ili_item.li_lsn;
AIL_UNLOCK(mp, s);
+ spin_lock(&iip->ili_inode->i_flags_lock);
iip->ili_inode->i_flags |= XFS_ISTALE;
+ spin_unlock(&iip->ili_inode->i_flags_lock);
pre_flushed++;
}
lip = lip->li_bio_list;
@@ -2754,19 +2761,29 @@ xfs_iunpin(
* call as the inode reclaim may be blocked waiting for
* the inode to become unpinned.
*/
+ struct inode *inode = NULL;
+
+ spin_lock(&ip->i_flags_lock);
if (!(ip->i_flags & (XFS_IRECLAIM|XFS_IRECLAIMABLE))) {
bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
/* make sync come back and flush this inode */
if (vp) {
- struct inode *inode = vn_to_inode(vp);
+ inode = vn_to_inode(vp);
if (!(inode->i_state &
- (I_NEW|I_FREEING|I_CLEAR)))
- mark_inode_dirty_sync(inode);
+ (I_NEW|I_FREEING|I_CLEAR))) {
+ inode = igrab(inode);
+ if (inode)
+ mark_inode_dirty_sync(inode);
+ } else
+ inode = NULL;
}
}
+ spin_unlock(&ip->i_flags_lock);
wake_up(&ip->i_ipin_wait);
+ if (inode)
+ iput(inode);
}
}