diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfsd/nfsctl.c | 13 | ||||
| -rw-r--r-- | fs/super.c | 13 |
2 files changed, 14 insertions, 12 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 9690cb4dd588..5a6ae2522266 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1154,20 +1154,15 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent) #endif /* last one */ {""} }; - struct net *net = data; - int ret; - - ret = simple_fill_super(sb, 0x6e667364, nfsd_files); - if (ret) - return ret; - sb->s_fs_info = get_net(net); - return 0; + get_net(sb->s_fs_info); + return simple_fill_super(sb, 0x6e667364, nfsd_files); } static struct dentry *nfsd_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { - return mount_ns(fs_type, flags, current->nsproxy->net_ns, nfsd_fill_super); + struct net *net = current->nsproxy->net_ns; + return mount_ns(fs_type, flags, data, net, net->user_ns, nfsd_fill_super); } static void nfsd_umount(struct super_block *sb) diff --git a/fs/super.c b/fs/super.c index d78b9847e6cb..fd65667832e5 100644 --- a/fs/super.c +++ b/fs/super.c @@ -918,12 +918,19 @@ static int ns_set_super(struct super_block *sb, void *data) return set_anon_super(sb, NULL); } -struct dentry *mount_ns(struct file_system_type *fs_type, int flags, - void *data, int (*fill_super)(struct super_block *, void *, int)) +struct dentry *mount_ns(struct file_system_type *fs_type, + int flags, void *data, void *ns, struct user_namespace *user_ns, + int (*fill_super)(struct super_block *, void *, int)) { struct super_block *sb; - sb = sget(fs_type, ns_test_super, ns_set_super, flags, data); + /* Don't allow mounting unless the caller has CAP_SYS_ADMIN + * over the namespace. + */ + if (!(flags & MS_KERNMOUNT) && !ns_capable(user_ns, CAP_SYS_ADMIN)) + return ERR_PTR(-EPERM); + + sb = sget(fs_type, ns_test_super, ns_set_super, flags, ns); if (IS_ERR(sb)) return ERR_CAST(sb); |