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SubjectRe: Regression in 5.3 for some FS_USERNS_MOUNT (aka user-namespace-mountable) filesystems
On Fri, Jul 26, 2019 at 07:46:18PM -0500, Eric W. Biederman wrote:

> If someone had bothered to actually look at how I was proposing to clean
> things up before the new mount api we would already have that. Sigh.
> You should be able to get away with something like this which moves the
> checks earlier and makes things clearer. My old patch against the pre
> new mount api code.

Check your instances of ->permission(); AFAICS in all cases it's (in
current terms)
return ns_capable(fc->user_ns, CAP_SYS_ADMIN) ? 0 : -EPERM;

In principle I like killing FS_USERNS_MOUNT flag, but when a method
is always either NULL or exact same function...

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