From f0768ebd09385551277fcbc8b28c29eb491bf9e2 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Sun, 1 Jul 2007 12:13:01 -0400 Subject: [PATCH] NFS: Introduce nfs4_validate_mount_options Refactor NFSv4 mount processing to break out mount data validation in the same way it's broken out in the NFSv2/v3 mount path. Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust --- fs/nfs/super.c | 153 ++++++++++++++++++++++++++++--------------------- 1 file changed, 89 insertions(+), 64 deletions(-) diff --git a/fs/nfs/super.c b/fs/nfs/super.c index baf75e9bd3fe..ed3ec4477a0f 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -813,6 +813,89 @@ static void nfs4_fill_super(struct super_block *sb) nfs_initialise_sb(sb); } +/* + * Validate NFSv4 mount options + */ +static int nfs4_validate_mount_data(struct nfs4_mount_data **options, + const char *dev_name, + struct sockaddr_in *addr, + rpc_authflavor_t *authflavour, + char **hostname, + char **mntpath, + char **ip_addr) +{ + struct nfs4_mount_data *data = *options; + char *c; + + if (data == NULL) + goto out_no_data; + + switch (data->version) { + case 1: + if (data->host_addrlen != sizeof(*addr)) + goto out_no_address; + if (copy_from_user(addr, data->host_addr, sizeof(*addr))) + return -EFAULT; + if (addr->sin_port == 0) + addr->sin_port = htons(NFS_PORT); + if (!nfs_verify_server_address((struct sockaddr *) addr)) + goto out_no_address; + + switch (data->auth_flavourlen) { + case 0: + *authflavour = RPC_AUTH_UNIX; + break; + case 1: + if (copy_from_user(authflavour, data->auth_flavours, + sizeof(*authflavour))) + return -EFAULT; + break; + default: + goto out_inval_auth; + } + + c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); + if (IS_ERR(c)) + return PTR_ERR(c); + *hostname = c; + + c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); + if (IS_ERR(c)) + return PTR_ERR(c); + *mntpath = c; + dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *mntpath); + + c = strndup_user(data->client_addr.data, 16); + if (IS_ERR(c)) + return PTR_ERR(c); + *ip_addr = c; + + break; + default: + goto out_bad_version; + } + + return 0; + +out_no_data: + dfprintk(MOUNT, "NFS4: mount program didn't pass any mount data\n"); + return -EINVAL; + +out_inval_auth: + dfprintk(MOUNT, "NFS4: Invalid number of RPC auth flavours %d\n", + data->auth_flavourlen); + return -EINVAL; + +out_no_address: + dfprintk(MOUNT, "NFS4: mount program didn't pass remote address\n"); + return -EINVAL; + +out_bad_version: + dfprintk(MOUNT, "NFS4: bad nfs_mount_data version %d\n", + data->version); + return -EINVAL; +} + /* * Get the superblock for an NFS4 mountpoint */ @@ -826,68 +909,14 @@ static int nfs4_get_sb(struct file_system_type *fs_type, rpc_authflavor_t authflavour; struct nfs_fh mntfh; struct dentry *mntroot; - char *p, *mntpath = NULL, *hostname = NULL, *ip_addr = NULL; + char *mntpath = NULL, *hostname = NULL, *ip_addr = NULL; int error; - if (data == NULL) { - dprintk("%s: missing data argument\n", __FUNCTION__); - return -EINVAL; - } - if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) { - dprintk("%s: bad mount version\n", __FUNCTION__); - return -EINVAL; - } - - /* We now require that the mount process passes the remote address */ - if (data->host_addrlen != sizeof(addr)) - return -EINVAL; - - if (copy_from_user(&addr, data->host_addr, sizeof(addr))) - return -EFAULT; - - if (!nfs_verify_server_address((struct sockaddr *) &addr)) { - dprintk("%s: mount program didn't pass remote IP address!\n", - __FUNCTION__); - return -EINVAL; - } - - /* RFC3530: The default port for NFS is 2049 */ - if (addr.sin_port == 0) - addr.sin_port = htons(NFS_PORT); - - /* Grab the authentication type */ - authflavour = RPC_AUTH_UNIX; - if (data->auth_flavourlen != 0) { - if (data->auth_flavourlen != 1) { - dprintk("%s: Invalid number of RPC auth flavours %d.\n", - __FUNCTION__, data->auth_flavourlen); - error = -EINVAL; - goto out; - } - - if (copy_from_user(&authflavour, data->auth_flavours, - sizeof(authflavour))) { - error = -EFAULT; - goto out; - } - } - - p = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); - if (IS_ERR(p)) - goto out_err; - hostname = p; - - p = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); - if (IS_ERR(p)) - goto out_err; - mntpath = p; - - dprintk("MNTPATH: %s\n", mntpath); - - p = strndup_user(data->client_addr.data, 16); - if (IS_ERR(p)) - goto out_err; - ip_addr = p; + /* Validate the mount data */ + error = nfs4_validate_mount_data(&data, dev_name, &addr, &authflavour, + &hostname, &mntpath, &ip_addr); + if (error < 0) + goto out; /* Get a volume representation */ server = nfs4_create_server(data, hostname, &addr, mntpath, ip_addr, @@ -932,10 +961,6 @@ out: kfree(hostname); return error; -out_err: - error = PTR_ERR(p); - goto out; - out_free: nfs_free_server(server); goto out; -- 2.20.1