linux-kernel - Re: [PATCH 1/2] copy_process: fix CLONE_PARENT && ->exit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090226223031.GA14477@redhat.com>
Date:	Thu, 26 Feb 2009 23:30:31 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Chris Evans <scarybeasts@...il.com>,
	David Howells <dhowells@...hat.com>,
	Don Howard <dhoward@...hat.com>,
	Eugene Teo <eugene@...hat.com>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Tavis Ormandy <taviso@....lonestar.org>,
	Vitaly Mayatskikh <vmayatsk@...hat.com>, stable@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] copy_process: fix CLONE_PARENT && ->exit_signal
	interaction

On 02/26, Linus Torvalds wrote:
>
> On Thu, 26 Feb 2009, Oleg Nesterov wrote:
> >
> > Really, how CLONE_PARENT + exit_signal==0 can be useful?
>
> Umm? For the reason I already stated?

But I can not understand that reason... As I said, the thread does not
go away if exit_signal == 0. Yes, the parent does not see it has a new
zombie, but why this is useful?

> > But because the current behaviour is just silly. Imho.
>
> So? If there are people using it, you calling it silly is immaterial.
>
> The fact is, it's an existing user space interface. We don't break them.
>
> > But of course, if this change can break the user-space applications, then
> > it should not be applied.
>
> That's the point. Nobody has shown that there aren't any users.

Yes, yes, sure...

I sent another patch, perhaps someone can comment. Or suggest something
else.

Oleg.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/