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authorDave Chinner <dchinner@redhat.com>2010-06-24 03:15:47 +0200
committerDave Chinner <david@fromorbit.com>2010-06-24 03:15:47 +0200
commit1920779e67cbf5ea8afef317777c5bf2b8096188 (patch)
treef3450e4075162ef5ec360446c301513a5adf316e /fs
parentxfs: validate untrusted inode numbers during lookup (diff)
downloadlinux-1920779e67cbf5ea8afef317777c5bf2b8096188.tar.xz
linux-1920779e67cbf5ea8afef317777c5bf2b8096188.zip
xfs: rename XFS_IGET_BULKSTAT to XFS_IGET_UNTRUSTED
Inode numbers may come from somewhere external to the filesystem (e.g. file handles, bulkstat information) and so are inherently untrusted. Rename the flag we use for these lookups to make it obvious we are doing a lookup of an untrusted inode number and need to verify it completely before trying to read it from disk. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/linux-2.6/xfs_export.c9
-rw-r--r--fs/xfs/xfs_ialloc.c11
-rw-r--r--fs/xfs/xfs_inode.c2
-rw-r--r--fs/xfs/xfs_inode.h2
-rw-r--r--fs/xfs/xfs_itable.c2
5 files changed, 14 insertions, 12 deletions
diff --git a/fs/xfs/linux-2.6/xfs_export.c b/fs/xfs/linux-2.6/xfs_export.c
index 846b75aeb2ab..92c84a19cc9e 100644
--- a/fs/xfs/linux-2.6/xfs_export.c
+++ b/fs/xfs/linux-2.6/xfs_export.c
@@ -128,12 +128,11 @@ xfs_nfs_get_inode(
return ERR_PTR(-ESTALE);
/*
- * The XFS_IGET_BULKSTAT means that an invalid inode number is just
- * fine and not an indication of a corrupted filesystem. Because
- * clients can send any kind of invalid file handle, e.g. after
- * a restore on the server we have to deal with this case gracefully.
+ * The XFS_IGET_UNTRUSTED means that an invalid inode number is just
+ * fine and not an indication of a corrupted filesystem as clients can
+ * send invalid file handles and we have to handle it gracefully..
*/
- error = xfs_iget(mp, NULL, ino, XFS_IGET_BULKSTAT,
+ error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED,
XFS_ILOCK_SHARED, &ip, 0);
if (error) {
/*
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index 0c946c8e05da..d8fd36685eb9 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -1251,7 +1251,7 @@ xfs_imap_lookup(
return error;
/* for untrusted inodes check it is allocated first */
- if ((flags & XFS_IGET_BULKSTAT) &&
+ if ((flags & XFS_IGET_UNTRUSTED) &&
(rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino)))
return EINVAL;
@@ -1292,8 +1292,11 @@ xfs_imap(
if (agno >= mp->m_sb.sb_agcount || agbno >= mp->m_sb.sb_agblocks ||
ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
#ifdef DEBUG
- /* no diagnostics for bulkstat, ino comes from userspace */
- if (flags & XFS_IGET_BULKSTAT)
+ /*
+ * Don't output diagnostic information for untrusted inodes
+ * as they can be invalid without implying corruption.
+ */
+ if (flags & XFS_IGET_UNTRUSTED)
return XFS_ERROR(EINVAL);
if (agno >= mp->m_sb.sb_agcount) {
xfs_fs_cmn_err(CE_ALERT, mp,
@@ -1329,7 +1332,7 @@ xfs_imap(
* inodes in stale state on disk. Hence we have to do a btree lookup
* in all cases where an untrusted inode number is passed.
*/
- if (flags & XFS_IGET_BULKSTAT) {
+ if (flags & XFS_IGET_UNTRUSTED) {
error = xfs_imap_lookup(mp, tp, agno, agino, agbno,
&chunk_agbno, &offset_agbno, flags);
if (error)
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index d53c39de7d05..12c277a5e98a 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -177,7 +177,7 @@ xfs_imap_to_bp(
if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
XFS_ERRTAG_ITOBP_INOTOBP,
XFS_RANDOM_ITOBP_INOTOBP))) {
- if (iget_flags & XFS_IGET_BULKSTAT) {
+ if (iget_flags & XFS_IGET_UNTRUSTED) {
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EINVAL);
}
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 9965e40a4615..6b31b38244ab 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -500,7 +500,7 @@ do { \
* Flags for xfs_iget()
*/
#define XFS_IGET_CREATE 0x1
-#define XFS_IGET_BULKSTAT 0x2
+#define XFS_IGET_UNTRUSTED 0x2
int xfs_inotobp(struct xfs_mount *, struct xfs_trans *,
xfs_ino_t, struct xfs_dinode **,
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 83d7827793e4..2acd12fd3f25 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -80,7 +80,7 @@ xfs_bulkstat_one_int(
return XFS_ERROR(ENOMEM);
error = xfs_iget(mp, NULL, ino,
- XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
+ XFS_IGET_UNTRUSTED, XFS_ILOCK_SHARED, &ip, bno);
if (error) {
*stat = BULKSTAT_RV_NOTHING;
goto out_free;