linux-kernel - Re: [PATCH 11/12] pid: rewrite task helper functions avoiding task->pid and task->tgid

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20130822200555.GN31370@twins.programming.kicks-ass.net>
Date:	Thu, 22 Aug 2013 22:05:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	linux-audit@...hat.com, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Eric Paris <eparis@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Ingo Molnar <mingo@...hat.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	John Johansen <john.johansen@...onical.com>,
	James Morris <james.l.morris@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Kentaro Takeda <takedakn@...data.co.jp>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH 11/12] pid: rewrite task helper functions avoiding
 task->pid and task->tgid

On Tue, Aug 20, 2013 at 05:32:03PM -0400, Richard Guy Briggs wrote:
> This stops these four task helper functions from using the deprecated and
> error-prone task->pid and task->tgid.
> 
> (informed by ebiederman's ea5a4d01)
> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
> Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> ---
>  include/linux/sched.h |    8 ++++----
>  1 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 8e69807..46e739d 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1579,7 +1579,7 @@ static inline int pid_alive(struct task_struct *p)
>   */
>  static inline int is_global_init(struct task_struct *tsk)
>  {
> -	return tsk->pid == 1;
> +	return task_pid_nr(tsk) == 1;
>  }
>  
>  extern struct pid *cad_pid;
> @@ -1930,7 +1930,7 @@ extern struct task_struct *idle_task(int cpu);
>   */
>  static inline bool is_idle_task(const struct task_struct *p)
>  {
> -	return p->pid == 0;
> +	return task_pid(p) == &init_struct_pid;
>  }
>  extern struct task_struct *curr_task(int cpu);
>  extern void set_curr_task(int cpu, struct task_struct *p);

Why would you ever want to do this? It just makes these tests more
expensive for no gain what so ff'ing ever.
--
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/