diff options
author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-03-14 15:07:33 +0100 |
---|---|---|
committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-03-14 15:07:33 +0100 |
commit | b70366e5d31788650b2a5cec5cd13ea80ac7e44a (patch) | |
tree | d972ffd190111d699200448494fda333d28b2486 /fs/super.c | |
parent | f42e181935d5e5670c87d31ae48063a495bbacae (diff) | |
parent | db6ccf23e8ba40fc2e8914ec9c0eb950df71d9fe (diff) |
Merge tag 'doc-4.11-images' of git://git.lwn.net/linux into drm-misc-next
Pointer for Markus's image conversion work.
We need this so we can merge all the pretty drm graphs for 4.12.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'fs/super.c')
-rw-r--r-- | fs/super.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/super.c b/fs/super.c index 1709ed029a2c..b8b6a086c03b 100644 --- a/fs/super.c +++ b/fs/super.c @@ -469,7 +469,7 @@ struct super_block *sget_userns(struct file_system_type *type, struct super_block *old; int err; - if (!(flags & MS_KERNMOUNT) && + if (!(flags & (MS_KERNMOUNT|MS_SUBMOUNT)) && !(type->fs_flags & FS_USERNS_MOUNT) && !capable(CAP_SYS_ADMIN)) return ERR_PTR(-EPERM); @@ -499,7 +499,7 @@ retry: } if (!s) { spin_unlock(&sb_lock); - s = alloc_super(type, flags, user_ns); + s = alloc_super(type, (flags & ~MS_SUBMOUNT), user_ns); if (!s) return ERR_PTR(-ENOMEM); goto retry; @@ -540,8 +540,15 @@ struct super_block *sget(struct file_system_type *type, { struct user_namespace *user_ns = current_user_ns(); + /* We don't yet pass the user namespace of the parent + * mount through to here so always use &init_user_ns + * until that changes. + */ + if (flags & MS_SUBMOUNT) + user_ns = &init_user_ns; + /* Ensure the requestor has permissions over the target filesystem */ - if (!(flags & MS_KERNMOUNT) && !ns_capable(user_ns, CAP_SYS_ADMIN)) + if (!(flags & (MS_KERNMOUNT|MS_SUBMOUNT)) && !ns_capable(user_ns, CAP_SYS_ADMIN)) return ERR_PTR(-EPERM); return sget_userns(type, test, set, flags, user_ns, data); @@ -1047,7 +1054,7 @@ static int set_bdev_super(struct super_block *s, void *data) * We set the bdi here to the queue backing, file systems can * overwrite this in ->fill_super() */ - s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; + s->s_bdi = bdev_get_queue(s->s_bdev)->backing_dev_info; return 0; } |