Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933811Ab3CVPxq (ORCPT ); Fri, 22 Mar 2013 11:53:46 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:36761 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933516Ab3CVPxo (ORCPT ); Fri, 22 Mar 2013 11:53:44 -0400 From: Dave Chiluk To: Trond.Myklebust@netapp.com, linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] NFSv4: Fix the string length returned by the idmapper Date: Fri, 22 Mar 2013 10:53:32 -0500 Message-Id: <1363967612-28488-1-git-send-email-chiluk@canonical.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2377 Lines: 69 From: Trond Myklebust 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). This fixes inability to chown on chgrp files on AIX nfs shares. Reported-by: Dave Chiluk Signed-off-by: Trond Myklebust Cc: Bryan Schumaker Cc: stable@vger.kernel.org [>=3.4] --- fs/nfs/idmap.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c index dc0f98d..99e9ec6 100644 --- a/fs/nfs/idmap.c +++ b/fs/nfs/idmap.c @@ -726,9 +726,10 @@ 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); } @@ -738,6 +739,7 @@ static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, struct key *key, struct key *authkey) { char id_str[NFS_UINT_MAXLEN]; + size_t len; int ret = -ENOKEY; /* ret = -ENOKEY */ @@ -747,13 +749,15 @@ static int nfs_idmap_read_and_verify_message(struct idmap_msg *im, 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; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/