Re: [PATCH] proc: make proc_fd_permission() thread-friendly

[Oleg Nesterov]

On 08/26, Andy Lutomirski wrote:
>
> On Aug 26, 2013 12:35 PM, "Linus Torvalds" <torvalds@xxxxxxxxxxxxxxxxxxxx>
> wrote:
> >
> > Yes, it would be semantically different, but it would mean that
> > "/proc/self/fd/" would actually make sense in a way that it currently
> > does *not* - which would seem fairly important, since the primary use
> > for it tends to be /dev/stdin.
> >
> > And the other semantic differences might be much harder to notice.
> > Worth testing?
>
> The "children" subdirectory will be different.  But it's already screwed up.

No, it lives in tid_base_stuff, it should be only visible in
/proc/*/task/tid/ dir.

(and perhaps it also makes sense to remove mem/exe-like things from
 tid_base_stuff...)

Anyway I agree, this change is risky.

Oleg.

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