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

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Message-ID: <CA+55aFzoXyA8TU5XXqaNj1EzZ9H-pbTbJ85--zhWzAOLThyjSQ@mail.gmail.com>
Date:	Tue, 27 Aug 2013 09:39:54 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
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 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?

Or perhaps even more complicated, and say "if it's a task group
leader, keep the old /proc/<tgid>, otherwise do the full thread path".

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

             Linus
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