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

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Date:	Sun, 11 Mar 2012 18:25:12 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Djalal Harouni <tixxdz@...ndz.org>
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 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.

Btw this is also true for parent_exec_id/self_exec_id, but this is
another story.

Oleg.

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