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Date: Wed, 12 Feb 2020 20:38:33 +0000
From: Al Viro <>
To: Linus Torvalds <>
Cc: "Eric W. Biederman" <>,
	LKML <>,
	Kernel Hardening <>,
	Linux API <>,
	Linux FS Devel <>,
	Linux Security Module <>,
	Akinobu Mita <>,
	Alexey Dobriyan <>,
	Andrew Morton <>,
	Andy Lutomirski <>,
	Daniel Micay <>,
	Djalal Harouni <>,
	"Dmitry V . Levin" <>,
	Greg Kroah-Hartman <>,
	Ingo Molnar <>,
	"J . Bruce Fields" <>,
	Jeff Layton <>,
	Jonathan Corbet <>, Kees Cook <>,
	Oleg Nesterov <>,
	Solar Designer <>
Subject: Re: [PATCH v8 07/11] proc: flush task dcache entries from all procfs

On Wed, Feb 12, 2020 at 12:35:04PM -0800, Linus Torvalds wrote:
> On Wed, Feb 12, 2020 at 12:03 PM Al Viro <> wrote:
> >
> > What's to prevent racing with fs shutdown while you are doing the second part?
> I was thinking that only the proc_flush_task() code would do this.
> And that holds a ref to the vfsmount through upid->ns.
> So I wasn't suggesting doing this in general - just splitting up the
> implementation of d_invalidate() so that proc_flush_task_mnt() could
> delay the complex part to after having traversed the RCU-protected
> list.
> But hey - I missed this part of the problem originally, so maybe I'm
> just missing something else this time. Wouldn't be the first time.

Wait, I thought the whole point of that had been to allow multiple
procfs instances for the same userns?  Confused...

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