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: <20060822183431.GB469@oleg>
Date:	Tue, 22 Aug 2006 22:34:31 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Bill Huey <billh@...ppy.monkey.org>
Cc:	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] futex_find_get_task: remove an obscure EXIT_ZOMBIE check

On 08/21, Bill Huey wrote:
>
> On Mon, Aug 21, 2006 at 09:06:04PM +0400, Oleg Nesterov wrote:
> > (Compile tested).
> > 
> > futex_find_get_task:
> > 
> > 	if (p->state == EXIT_ZOMBIE || p->exit_state == EXIT_ZOMBIE)
> > 		return NULL;
> > 
> > I can't understand this. First, p->state can't be EXIT_ZOMBIE. The ->exit_state
> > check looks strange too. Sub-threads or tasks whose ->parent ignores SIGCHLD go
> > directly to EXIT_DEAD state (I am ignoring a ptrace case). Why EXIT_DEAD tasks
> > should be ok? Yes, EXIT_ZOMBIE is more important (a task may stay zombie for a
> > long time), but this doesn't mean we should explicitely ignore other EXIT_XXX
> > states.
> 
> The p->state variable for EXIT_ZOMBIE is only live for some mystery architecture
> in arch/xtensa/kernel/ptrace.c

Thanks. This

	case PTRACE_KILL:
		ret = 0;
		if (child->state == EXIT_ZOMBIE)	/* already dead */
			break;

is an obvious bug, I beleive. May I suggest you to make a patch?

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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ