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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-05-21 01:34:39 +0200 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-07-09 18:08:40 +0200 |
| commit | 2116271a347d1181b5497602c2bfada1de8fd53b (patch) | |
| tree | 537498aa91bbe1fbbfc7f2c1e00910ca7fbc2261 /fs/nfs/file.c | |
| parent | NFS: Fix a preemption count leak in nfs_update_request (diff) | |
| download | linux-2116271a347d1181b5497602c2bfada1de8fd53b.tar.xz linux-2116271a347d1181b5497602c2bfada1de8fd53b.zip | |
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.c | 20 |
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; } /* |