linux-kernel - Re: [PATCH] proc: add "personality" to process status file

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Message-ID: <Pine.LNX.4.64.0810021544070.26309@shark.he.net>
Date:	Thu, 2 Oct 2008 15:46:31 -0700 (PDT)
From:	"Randy.Dunlap" <rdunlap@...otime.net>
To:	Kees Cook <kees.cook@...onical.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: add "personality" to process status file

On Thu, 2 Oct 2008, Kees Cook wrote:

> There is no sane way to query the personality flags of arbitrary process
> from userspace.  This adds the flags to the /proc/$pid/status file.
> For example, to detect READ_IMPLIES_EXEC:
> 
> $ ./32bit-sleeper &
> [1] 6732
> $ grep ^Pers /proc/6732/status
> Personality:    00000000
> $ execstack -s 32bit-sleeper
> $ ./32bit-slepper &
> [2] 6735
> $ grep ^Pers /proc/6735/status
> Personality:    00040000
> 
> Signed-off-by: Kees Cook <kees.cook@...onical.com>
> ---
>  fs/proc/array.c       |    6 ++++--
>  include/linux/sched.h |    3 +--
>  2 files changed, 5 insertions(+), 4 deletions(-)

Hey you,

The patch seems to be missing an update to Documentation/filesystems/proc.txt !
Please add that.  TIA.

> diff --git a/fs/proc/array.c b/fs/proc/array.c
> index 71c9be5..1235fab 100644
> --- a/fs/proc/array.c
> +++ b/fs/proc/array.c
> @@ -182,13 +182,15 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
>  		"PPid:\t%d\n"
>  		"TracerPid:\t%d\n"
>  		"Uid:\t%d\t%d\t%d\t%d\n"
> -		"Gid:\t%d\t%d\t%d\t%d\n",
> +		"Gid:\t%d\t%d\t%d\t%d\n"
> +		"Personality:\t%08x\n",
>  		get_task_state(p),
>  		task_tgid_nr_ns(p, ns),
>  		pid_nr_ns(pid, ns),
>  		ppid, tpid,
>  		p->uid, p->euid, p->suid, p->fsuid,
> -		p->gid, p->egid, p->sgid, p->fsgid);
> +		p->gid, p->egid, p->sgid, p->fsgid,
> +		p->personality);
>  
>  	task_lock(p);
>  	if (p->files)
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 3d9120c..f2fc441 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1085,8 +1085,7 @@ struct task_struct {
>  	int exit_state;
>  	int exit_code, exit_signal;
>  	int pdeath_signal;  /*  The signal sent when the parent dies  */
> -	/* ??? */
> -	unsigned int personality;
> +	unsigned int personality; /* Special-case bits (linux/personality.h) */
>  	unsigned did_exec:1;
>  	pid_t pid;
>  	pid_t tgid;
> 

-- 
~Randy
--
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