This is a note to let you know that I've just added the patch titled
NFSv4: Fix the string length returned by the idmapper
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsv4-fix-the-string-length-returned-by-the-idmapper.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cf4ab538f1516606d3ae730dce15d6f33d96b7e1 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Date: Fri, 8 Mar 2013 12:56:37 -0500
Subject: NFSv4: Fix the string length returned by the idmapper
From: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
commit cf4ab538f1516606d3ae730dce15d6f33d96b7e1 upstream.
Functions like nfs_map_uid_to_name() and nfs_map_gid_to_group() are
expected to return a string without any terminating NUL character.
Regression introduced by commit 57e62324e469e092ecc6c94a7a86fe4bd6ac5172
(NFS: Store the legacy idmapper result in the keyring).
Reported-by: Dave Chiluk <dave.chiluk@xxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
Cc: Bryan Schumaker <bjschuma@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/nfs/idmap.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -725,9 +725,9 @@ out1:
return ret;
}
-static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data)
+static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data, size_t datalen)
{
- return key_instantiate_and_link(key, data, strlen(data) + 1,
+ return key_instantiate_and_link(key, data, datalen,
id_resolver_cache->thread_keyring,
authkey);
}
@@ -737,6 +737,7 @@ static int nfs_idmap_read_and_verify_mes
struct key *key, struct key *authkey)
{
char id_str[NFS_UINT_MAXLEN];
+ size_t len;
int ret = -ENOKEY;
/* ret = -ENOKEY */
@@ -746,13 +747,15 @@ static int nfs_idmap_read_and_verify_mes
case IDMAP_CONV_NAMETOID:
if (strcmp(upcall->im_name, im->im_name) != 0)
break;
- sprintf(id_str, "%d", im->im_id);
- ret = nfs_idmap_instantiate(key, authkey, id_str);
+ /* Note: here we store the NUL terminator too */
+ len = sprintf(id_str, "%d", im->im_id) + 1;
+ ret = nfs_idmap_instantiate(key, authkey, id_str, len);
break;
case IDMAP_CONV_IDTONAME:
if (upcall->im_id != im->im_id)
break;
- ret = nfs_idmap_instantiate(key, authkey, im->im_name);
+ len = strlen(im->im_name);
+ ret = nfs_idmap_instantiate(key, authkey, im->im_name, len);
break;
default:
ret = -EINVAL;
Patches currently in stable-queue which might be from Trond.Myklebust@xxxxxxxxxx are
queue-3.8/sunrpc-add-barriers-to-ensure-read-ordering-in-rpc_wake_up_task_queue_locked.patch
queue-3.8/pnfs-block-removing-dm-device-maybe-cause-oops-when-call-dev_remove.patch
queue-3.8/nfsv4.1-fix-a-race-in-pnfs-layoutcommit.patch
queue-3.8/nfsv4.1-always-clear-the-nfs_ino_layoutcommit-in-layoutreturn.patch
queue-3.8/nfsv4-fix-the-string-length-returned-by-the-idmapper.patch
--
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