diff options
| -rw-r--r-- | fs/super.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/fs/super.c b/fs/super.c index 2739f57515f8..9c371a04e1b6 100644 --- a/fs/super.c +++ b/fs/super.c @@ -583,6 +583,10 @@ struct super_block *sget_userns(struct file_system_type *type, struct super_block *old; int err; + /* Ensure the requestor has permissions over the target filesystem */ + if (!(flags & (SB_KERNMOUNT|SB_SUBMOUNT)) && !ns_capable(user_ns, CAP_SYS_ADMIN)) + return ERR_PTR(-EPERM); + if (!(flags & (SB_KERNMOUNT|SB_SUBMOUNT)) && !(type->fs_flags & FS_USERNS_MOUNT) && !capable(CAP_SYS_ADMIN)) @@ -653,10 +657,6 @@ struct super_block *sget(struct file_system_type *type, if (flags & SB_SUBMOUNT) user_ns = &init_user_ns; - /* Ensure the requestor has permissions over the target filesystem */ - if (!(flags & (SB_KERNMOUNT|SB_SUBMOUNT)) && !ns_capable(user_ns, CAP_SYS_ADMIN)) - return ERR_PTR(-EPERM); - return sget_userns(type, test, set, flags, user_ns, data); } @@ -1164,12 +1164,6 @@ struct dentry *mount_ns(struct file_system_type *fs_type, { struct super_block *sb; - /* Don't allow mounting unless the caller has CAP_SYS_ADMIN - * over the namespace. - */ - if (!(flags & SB_KERNMOUNT) && !ns_capable(user_ns, CAP_SYS_ADMIN)) - return ERR_PTR(-EPERM); - sb = sget_userns(fs_type, ns_test_super, ns_set_super, flags, user_ns, ns); if (IS_ERR(sb)) |