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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 11:28:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 11:28:08 -0700
commit8728f986fe29d872dc5dc72941088eb9cb8bc723 (patch)
treeb0742c9c396bc8e4fddfbe1da57777270a803970 /fs/nfs/super.c
parente72859b87f57826f41e07a87bbaed65ed1133f85 (diff)
parent721ccfb79b6f74f4052de70236d24047e73682d4 (diff)
downloadleg-kernel-8728f986fe29d872dc5dc72941088eb9cb8bc723.tar.gz
Merge tag 'nfs-for-3.10-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes and cleanups from Trond Myklebust: - NLM: stable fix for NFSv2/v3 blocking locks - NFSv4.x: stable fixes for the delegation recall error handling code - NFSv4.x: Security flavour negotiation fixes and cleanups by Chuck Lever - SUNRPC: A number of RPCSEC_GSS fixes and cleanups also from Chuck - NFSv4.x assorted state management and reboot recovery bugfixes - NFSv4.1: In cases where we have already looked up a file, and hold a valid filehandle, use the new open-by-filehandle operation instead of opening by name. - Allow the NFSv4.1 callback thread to freeze - NFSv4.x: ensure that file unlock waits for readahead to complete - NFSv4.1: ensure that the RPC layer doesn't override the NFS session table size negotiation by limiting the number of slots. - NFSv4.x: Fix SETATTR spec compatibility issues * tag 'nfs-for-3.10-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (67 commits) NFSv4: Warn once about servers that incorrectly apply open mode to setattr NFSv4: Servers should only check SETATTR stateid open mode on size change NFSv4: Don't recheck permissions on open in case of recovery cached open NFSv4.1: Don't do a delegated open for NFS4_OPEN_CLAIM_DELEG_CUR_FH modes NFSv4.1: Use the more efficient open_noattr call for open-by-filehandle NFS: Retry SETCLIENTID with AUTH_SYS instead of AUTH_NONE NFSv4: Ensure that we clear the NFS_OPEN_STATE flag when appropriate LOCKD: Ensure that nlmclnt_block resets block->b_status after a server reboot NFSv4: Ensure the LOCK call cannot use the delegation stateid NFSv4: Use the open stateid if the delegation has the wrong mode nfs: Send atime and mtime as a 64bit value NFSv4: Record the OPEN create mode used in the nfs4_opendata structure NFSv4.1: Set the RPC_CLNT_CREATE_INFINITE_SLOTS flag for NFSv4.1 transports SUNRPC: Allow rpc_create() to request that TCP slots be unlimited SUNRPC: Fix a livelock problem in the xprt->backlog queue NFSv4: Fix handling of revoked delegations by setattr NFSv4 release the sequence id in the return on close case nfs: remove unnecessary check for NULL inode->i_flock from nfs_delegation_claim_locks NFS: Ensure that NFS file unlock waits for readahead to complete NFS: Add functionality to allow waiting on all outstanding reads to complete ...
Diffstat (limited to 'fs/nfs/super.c')
-rw-r--r--fs/nfs/super.c80
1 files changed, 42 insertions, 38 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 2f8a29db0f1b..eb494f6a4c6b 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -920,7 +920,7 @@ static struct nfs_parsed_mount_data *nfs_alloc_parsed_mount_data(void)
data->mount_server.port = NFS_UNSPEC_PORT;
data->nfs_server.port = NFS_UNSPEC_PORT;
data->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- data->auth_flavors[0] = RPC_AUTH_UNIX;
+ data->auth_flavors[0] = RPC_AUTH_MAXFLAVOR;
data->auth_flavor_len = 1;
data->minorversion = 0;
data->need_mount = true;
@@ -1608,49 +1608,57 @@ out_security_failure:
}
/*
- * Match the requested auth flavors with the list returned by
- * the server. Returns zero and sets the mount's authentication
- * flavor on success; returns -EACCES if server does not support
- * the requested flavor.
+ * Select a security flavor for this mount. The selected flavor
+ * is planted in args->auth_flavors[0].
*/
-static int nfs_walk_authlist(struct nfs_parsed_mount_data *args,
- struct nfs_mount_request *request)
+static void nfs_select_flavor(struct nfs_parsed_mount_data *args,
+ struct nfs_mount_request *request)
{
- unsigned int i, j, server_authlist_len = *(request->auth_flav_len);
+ unsigned int i, count = *(request->auth_flav_len);
+ rpc_authflavor_t flavor;
+
+ if (args->auth_flavors[0] != RPC_AUTH_MAXFLAVOR)
+ goto out;
+
+ /*
+ * The NFSv2 MNT operation does not return a flavor list.
+ */
+ if (args->mount_server.version != NFS_MNT3_VERSION)
+ goto out_default;
/*
* Certain releases of Linux's mountd return an empty
- * flavor list. To prevent behavioral regression with
- * these servers (ie. rejecting mounts that used to
- * succeed), revert to pre-2.6.32 behavior (no checking)
- * if the returned flavor list is empty.
+ * flavor list in some cases.
*/
- if (server_authlist_len == 0)
- return 0;
+ if (count == 0)
+ goto out_default;
/*
- * We avoid sophisticated negotiating here, as there are
- * plenty of cases where we can get it wrong, providing
- * either too little or too much security.
- *
* RFC 2623, section 2.7 suggests we SHOULD prefer the
* flavor listed first. However, some servers list
- * AUTH_NULL first. Our caller plants AUTH_SYS, the
- * preferred default, in args->auth_flavors[0] if user
- * didn't specify sec= mount option.
+ * AUTH_NULL first. Avoid ever choosing AUTH_NULL.
*/
- for (i = 0; i < args->auth_flavor_len; i++)
- for (j = 0; j < server_authlist_len; j++)
- if (args->auth_flavors[i] == request->auth_flavs[j]) {
- dfprintk(MOUNT, "NFS: using auth flavor %d\n",
- request->auth_flavs[j]);
- args->auth_flavors[0] = request->auth_flavs[j];
- return 0;
- }
+ for (i = 0; i < count; i++) {
+ struct rpcsec_gss_info info;
+
+ flavor = request->auth_flavs[i];
+ switch (flavor) {
+ case RPC_AUTH_UNIX:
+ goto out_set;
+ case RPC_AUTH_NULL:
+ continue;
+ default:
+ if (rpcauth_get_gssinfo(flavor, &info) == 0)
+ goto out_set;
+ }
+ }
- dfprintk(MOUNT, "NFS: server does not support requested auth flavor\n");
- nfs_umount(request);
- return -EACCES;
+out_default:
+ flavor = RPC_AUTH_UNIX;
+out_set:
+ args->auth_flavors[0] = flavor;
+out:
+ dfprintk(MOUNT, "NFS: using auth flavor %d\n", args->auth_flavors[0]);
}
/*
@@ -1713,12 +1721,8 @@ static int nfs_request_mount(struct nfs_parsed_mount_data *args,
return status;
}
- /*
- * MNTv1 (NFSv2) does not support auth flavor negotiation.
- */
- if (args->mount_server.version != NFS_MNT3_VERSION)
- return 0;
- return nfs_walk_authlist(args, &request);
+ nfs_select_flavor(args, &request);
+ return 0;
}
struct dentry *nfs_try_mount(int flags, const char *dev_name,