linux-kernel - Re: [PATCH 1/9] exec: add a global execve counter

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Message-ID: <20120311233615.GD10787@dztty>
Date:	Mon, 12 Mar 2012 00:36:15 +0100
From:	Djalal Harouni <tixxdz@...ndz.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Kees Cook <keescook@...omium.org>,
	Solar Designer <solar@...nwall.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	James Morris <james.l.morris@...cle.com>,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg KH <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...e.hu>, Stephen Wilson <wilsons@...rt.ca>,
	"Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH 1/9] exec: add a global execve counter

On Sun, Mar 11, 2012 at 06:25:12PM +0100, Oleg Nesterov wrote:
> On 03/11, Djalal Harouni wrote:
> >
> > --- a/include/linux/sched.h
> > +++ b/include/linux/sched.h
> > @@ -1420,6 +1420,9 @@ struct task_struct {
> >  #endif
> >  	seccomp_t seccomp;
> >
> > +/* Execve counter: will be used to check if objects belong to the appropriate
> > + * process image */
> > +	atomic64_t exec_id;
> >  /* Thread group tracking */
> >     	u32 parent_exec_id;
> >     	u32 self_exec_id;
> 
> Well, I don't think it is right to add this counter into task_struct.
> 
> It should be per-process, signal_struct makes more sense. Or may be
> mm_struct.
Some /proc/<pid>/{syscall,stack,...} do not operate on mm_struct so why we
should add the: "acquire a reference to mm, get exec_id and mmput".

For the signal_struct currently I don't know, from a comment it seems that
signal_struct can be shared! I don't know.

> Btw this is also true for parent_exec_id/self_exec_id, but this is
> another story.
Yes someone who knows this should check it.

> Oleg.
Thanks.

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tixxdz
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