linux-kernel - Re: [patch cr 3/4] c/r: procfs: add arg_start/end, env_start/end and 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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Thu, 2 Feb 2012 15:26:48 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>,
	Andrew Vagin <avagin@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [patch cr 3/4] c/r: procfs: add arg_start/end, env_start/end
 and exit_code members to /proc/$pid/stat

On Mon, 30 Jan 2012 18:09:08 +0400
Cyrill Gorcunov <gorcunov@...nvz.org> wrote:

> We would like to have an ability to restore command line
> arguments and envirion pointers so the task being restored
> would print appropriate values in /proc/pid/cmdline and
> /proc/pid/envirion. The exit_code is needed to restore
> zombie tasks.
> 
> ...
>
> --- linux-2.6.git.orig/fs/proc/array.c
> +++ linux-2.6.git/fs/proc/array.c
> @@ -464,7 +464,7 @@ static int do_task_stat(struct seq_file
>  
>  	seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
>  %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
> -%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld %lu %lu %lu\n",
> +%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld ",
>  		pid_nr_ns(pid, ns),
>  		tcomm,
>  		state,
> @@ -511,10 +511,25 @@ static int do_task_stat(struct seq_file
>  		task->policy,
>  		(unsigned long long)delayacct_blkio_ticks(task),
>  		cputime_to_clock_t(gtime),
> -		cputime_to_clock_t(cgtime),
> -		(mm && permitted) ? mm->start_data : 0,
> -		(mm && permitted) ? mm->end_data : 0,
> -		(mm && permitted) ? mm->start_brk : 0);
> +		cputime_to_clock_t(cgtime));
> +
> +		if (mm && permitted) {
> +			seq_printf(m, "%lu %lu %lu %lu %lu %lu %lu ",
> +				   mm->start_data,
> +				   mm->end_data,
> +				   mm->start_brk,
> +				   mm->arg_start,
> +				   mm->arg_end,
> +				   mm->env_start,
> +				   mm->env_end);
> +		} else
> +			seq_printf(m, "0 0 0 0 0 0 0 ");

heh.

We have a whizzy new num_to_str() in -mm which can later be used to
speed this up.

This actually means that your patch will conflict horridly with
procfs-add-num_to_str-to-speed-up-proc-stat.patch, because that patch
redoes /proc/stat handling.  I guess I can take care of that issue.

> +
> +		if (permitted)
> +			seq_printf(m, "%d\n", task->exit_code);
> +		else
> +			seq_printf(m, "0\n");
> +
>  	if (mm)
>  		mmput(mm);
>  	return 0;

--
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/