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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>
This commit is contained in:
Trond Myklebust 2008-05-20 19:34:39 -04:00
parent f3d47a3a6a
commit 2116271a34
3 changed files with 40 additions and 5 deletions
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20
fs/nfs/file.c
View File

@ -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;
}
/*

24
fs/nfs/proc.c
View File

@ -598,6 +598,29 @@ nfs_proc_lock(struct file *filp, int cmd, struct file_lock *fl)
return nlmclnt_proc(NFS_SERVER(inode)->nlm_host, cmd, fl);
}
/* Helper functions for NFS lock bounds checking */
#define NFS_LOCK32_OFFSET_MAX ((__s32)0x7fffffffUL)
static int nfs_lock_check_bounds(const struct file_lock *fl)
{
__s32 start, end;
start = (__s32)fl->fl_start;
if ((loff_t)start != fl->fl_start)
goto out_einval;
if (fl->fl_end != OFFSET_MAX) {
end = (__s32)fl->fl_end;
if ((loff_t)end != fl->fl_end)
goto out_einval;
} else
end = NFS_LOCK32_OFFSET_MAX;
if (start < 0 || start > end)
goto out_einval;
return 0;
out_einval:
return -EINVAL;
}
const struct nfs_rpc_ops nfs_v2_clientops = {
.version = 2, /* protocol version */
@ -633,4 +656,5 @@ const struct nfs_rpc_ops nfs_v2_clientops = {
.file_open = nfs_open,
.file_release = nfs_release,
.lock = nfs_proc_lock,
.lock_check_bounds = nfs_lock_check_bounds,
};

1
include/linux/nfs_xdr.h
View File

@ -832,6 +832,7 @@ struct nfs_rpc_ops {
int (*file_open) (struct inode *, struct file *);
int (*file_release) (struct inode *, struct file *);
int (*lock)(struct file *, int, struct file_lock *);
int (*lock_check_bounds)(const struct file_lock *);
void (*clear_acl_cache)(struct inode *);
};