linux-kernel - Re: [PATCH 1/1] proc: make /proc/self point to thread

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Message-ID: <20130827174916.GA802@redhat.com>
Date:	Tue, 27 Aug 2013 19:49:16 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Willy Tarreau <w@....eu>, Al Viro <viro@...iv.linux.org.uk>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Brad Spengler <spender@...ecurity.net>
Subject: Re: [PATCH 1/1] proc: make /proc/self point to thread

On 08/27, Linus Torvalds wrote:
>
> On Tue, Aug 27, 2013 at 7:40 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> > /proc/self points to /proc/<tgid>, not to /proc/<tid>, and thus
> > "self" actually means "group leader".
> >
> > Change fs/proc/self.c to print the caller's tid, this is probably
> > what the users actually expect.
>
> Yeah, thinking more about this, this can't work. I think you'd need to
> use "/proc/<tgid>/task/<tid>" wouldn't you?

Why? To me /proc/self == /proc/$((sys_gettid)) looks more natural.
Say, /proc/self/task... But this is subjective.

Not to mention, that would be much more visible change.

> Anyway, does not not sound worth it. Your previous simple patch is
> probably the right thing to do.

OK, lets forget it.

Although to be honest, I was seduced by "Worth testing". I mean I am
just curious, who can suffer from this change? Nevermind, please
ignore.

Oleg.

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