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mnt: Move the FS_USERNS_MOUNT check into sget_userns

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Allowing a filesystem to be mounted by other than root in the initial
user namespace is a filesystem property not a mount namespace property
and as such should be checked in filesystem specific code.  Move the
FS_USERNS_MOUNT test into super.c:sget_userns().

Acked-by: Seth Forshee <[email protected]>
Signed-off-by: "Eric W. Biederman" <[email protected]>
This commit is contained in:
Eric W. Biederman 2016-06-06 15:48:04 -05:00
commit a001e74cef
2 changed files with 4 additions and 4 deletions
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4
fs/super.c
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@ -466,6 +466,10 @@ struct super_block *sget_userns(struct file_system_type *type,
struct super_block *old;
int err;
if (!(flags & MS_KERNMOUNT) &&
!(type->fs_flags & FS_USERNS_MOUNT) &&
!capable(CAP_SYS_ADMIN))
return ERR_PTR(-EPERM);
retry:
spin_lock(&sb_lock);
if (test) {