[2.6.22.y] {12/14} - NFS: Fix an Oops in encode_lookup() - on top of 2.6.22.17

From: Oliver Pinter
Date: Thu Feb 07 2008 - 15:08:51 EST


aka: nfs-name-len-limit.patch

Patch-mainline: 2.6.23
References: 325913
GIT: 54af3bb543c071769141387a42deaaab5074da55 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Date: Fri, 28 Sep 2007 12:27:41 -0400

Subject: [PATCH] NFS: Fix an Oops in encode_lookup()

mainline: 54af3bb543c071769141387a42deaaab5074da55

It doesn't look as if the NFS file name limit is being initialised correctly
in the struct nfs_server. Make sure that we limit whatever is being set in
nfs_probe_fsinfo() and nfs_init_server().

Also ensure that readdirplus and nfs4_path_walk respect our file name
limits.

Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Acked-by: NeilBrown <neilb@xxxxxxx>
CC: Oliver Pinter <oliver.pntr@xxxxxxxxx>

---
fs/nfs/client.c | 29 +++++++++++++++++++----------
fs/nfs/dir.c | 2 ++
fs/nfs/getroot.c | 3 +++
3 files changed, 24 insertions(+), 10 deletions(-)

--- linux-2.6.22-SL103_BRANCH.orig/fs/nfs/client.c
+++ linux-2.6.22-SL103_BRANCH/fs/nfs/client.c
@@ -614,16 +614,6 @@ static int nfs_init_server(struct nfs_se
server->namelen = data->namlen;
/* Create a client RPC handle for the NFSv3 ACL management interface */
nfs_init_server_aclclient(server);
- if (clp->cl_nfsversion == 3) {
- if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
- server->namelen = NFS3_MAXNAMLEN;
- if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
- server->caps |= NFS_CAP_READDIRPLUS;
- } else {
- if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
- server->namelen = NFS2_MAXNAMLEN;
- }
-
dprintk("<-- nfs_init_server() = 0 [new %p]\n", clp);
return 0;

@@ -820,6 +810,16 @@ struct nfs_server *nfs_create_server(con
error = nfs_probe_fsinfo(server, mntfh, &fattr);
if (error < 0)
goto error;
+ if (server->nfs_client->rpc_ops->version == 3) {
+ if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
+ server->namelen = NFS3_MAXNAMLEN;
+ if (!(data->flags & NFS_MOUNT_NORDIRPLUS))
+ server->caps |= NFS_CAP_READDIRPLUS;
+ } else {
+ if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
+ server->namelen = NFS2_MAXNAMLEN;
+ }
+
if (!(fattr.valid & NFS_ATTR_FATTR)) {
error = server->nfs_client->rpc_ops->getattr(server, mntfh, &fattr);
if (error < 0) {
@@ -1010,6 +1010,9 @@ struct nfs_server *nfs4_create_server(co
if (error < 0)
goto error;

+ if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
+ server->namelen = NFS4_MAXNAMLEN;
+
BUG_ON(!server->nfs_client);
BUG_ON(!server->nfs_client->rpc_ops);
BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
@@ -1082,6 +1085,9 @@ struct nfs_server *nfs4_create_referral_
if (error < 0)
goto error;

+ if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
+ server->namelen = NFS4_MAXNAMLEN;
+
dprintk("Referral FSID: %llx:%llx\n",
(unsigned long long) server->fsid.major,
(unsigned long long) server->fsid.minor);
@@ -1141,6 +1147,9 @@ struct nfs_server *nfs_clone_server(stru
if (error < 0)
goto out_free_server;

+ if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
+ server->namelen = NFS4_MAXNAMLEN;
+
dprintk("Cloned FSID: %llx:%llx\n",
(unsigned long long) server->fsid.major,
(unsigned long long) server->fsid.minor);
--- linux-2.6.22-SL103_BRANCH.orig/fs/nfs/dir.c
+++ linux-2.6.22-SL103_BRANCH/fs/nfs/dir.c
@@ -1163,6 +1163,8 @@ static struct dentry *nfs_readdir_lookup
}
if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR))
return NULL;
+ if (name.len > NFS_SERVER(dir)->namelen)
+ return NULL;
/* Note: caller is already holding the dir->i_mutex! */
dentry = d_alloc(parent, &name);
if (dentry == NULL)
--- linux-2.6.22-SL103_BRANCH.orig/fs/nfs/getroot.c
+++ linux-2.6.22-SL103_BRANCH/fs/nfs/getroot.c
@@ -175,6 +175,9 @@ next_component:
path++;
name.len = path - (const char *) name.name;

+ if (name.len > NFS4_MAXNAMLEN)
+ return -ENAMETOOLONG;
+
eat_dot_dir:
while (*path == '/')
path++;


--
Thanks,
Oliver
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/