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authorTrond Myklebust <Trond.Myklebust@netapp.com>2008-05-20 19:34:39 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2008-07-09 12:08:40 -0400
commit2116271a347d1181b5497602c2bfada1de8fd53b (patch)
tree537498aa91bbe1fbbfc7f2c1e00910ca7fbc2261 /fs/nfs/file.c
parentf3d47a3a6a1484a93c8cfe1e8c8d4399c95199c7 (diff)
downloadlinux-2116271a347d1181b5497602c2bfada1de8fd53b.tar.bz2
NFS: Add correct bounds checking to NFSv2 locks
NFSv2 file locking currently fails the Connectathon tests, because the calls to the VFS locking code do not return an EINVAL error if the struct file_lock overflows the 32-bit boundaries. The problem is due to the fact that we occasionally call helpers from fs/locks.c in order to avoid RPC calls to the server when we know that a local process holds the lock. These helpers are, of course, always 64-bit enabled, so EINVAL is not returned in cases when it would if the call had gone to the NLM code. For consistency, we therefore add support for a bounds-checking helper. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/file.c')
-rw-r--r--fs/nfs/file.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index d84a3d8f32af..7c73f06692b6 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -593,6 +593,7 @@ out:
static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
{
struct inode * inode = filp->f_mapping->host;
+ int ret = -ENOLCK;
dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n",
inode->i_sb->s_id, inode->i_ino,
@@ -602,13 +603,22 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
/* No mandatory locks over NFS */
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
- return -ENOLCK;
+ goto out_err;
+
+ if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
+ ret = NFS_PROTO(inode)->lock_check_bounds(fl);
+ if (ret < 0)
+ goto out_err;
+ }
if (IS_GETLK(cmd))
- return do_getlk(filp, cmd, fl);
- if (fl->fl_type == F_UNLCK)
- return do_unlk(filp, cmd, fl);
- return do_setlk(filp, cmd, fl);
+ ret = do_getlk(filp, cmd, fl);
+ else if (fl->fl_type == F_UNLCK)
+ ret = do_unlk(filp, cmd, fl);
+ else
+ ret = do_setlk(filp, cmd, fl);
+out_err:
+ return ret;
}
/*