linux-kernel - Re: [RFC][PATCH v2 2/3] proc: Update get proc_pid

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Message-ID: <52D69844.9000200@tycho.nsa.gov>
Date:	Wed, 15 Jan 2014 09:16:36 -0500
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	William Roberts <bill.c.roberts@...il.com>, linux-audit@...hat.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, rgb@...hat.com,
	viro@...iv.linux.org.uk, akpm@...ux-foundation.org
CC:	William Roberts <wroberts@...sys.com>
Subject: Re: [RFC][PATCH v2 2/3] proc: Update get proc_pid_cmdline() to use
 mm.h helpers

On 01/13/2014 12:02 PM, William Roberts wrote:
> Re-factor proc_pid_cmdline() to use get_cmdline() helper
> from mm.h.
> 
> Signed-off-by: William Roberts <wroberts@...sys.com>

Acked-by:  Stephen Smalley <sds@...ho.nsa.gov>

> ---
>  fs/proc/base.c |   36 ++----------------------------------
>  1 file changed, 2 insertions(+), 34 deletions(-)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 03c8d74..cfd178d 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -200,41 +200,9 @@ static int proc_root_link(struct dentry *dentry, struct path *path)
>  	return result;
>  }
>  
> -static int proc_pid_cmdline(struct task_struct *task, char * buffer)
> +static int proc_pid_cmdline(struct task_struct *task, char *buffer)
>  {
> -	int res = 0;
> -	unsigned int len;
> -	struct mm_struct *mm = get_task_mm(task);
> -	if (!mm)
> -		goto out;
> -	if (!mm->arg_end)
> -		goto out_mm;	/* Shh! No looking before we're done */
> -
> - 	len = mm->arg_end - mm->arg_start;
> - 
> -	if (len > PAGE_SIZE)
> -		len = PAGE_SIZE;
> - 
> -	res = access_process_vm(task, mm->arg_start, buffer, len, 0);
> -
> -	// If the nul at the end of args has been overwritten, then
> -	// assume application is using setproctitle(3).
> -	if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
> -		len = strnlen(buffer, res);
> -		if (len < res) {
> -		    res = len;
> -		} else {
> -			len = mm->env_end - mm->env_start;
> -			if (len > PAGE_SIZE - res)
> -				len = PAGE_SIZE - res;
> -			res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
> -			res = strnlen(buffer, res);
> -		}
> -	}
> -out_mm:
> -	mmput(mm);
> -out:
> -	return res;
> +	return get_cmdline(task, buffer, PAGE_SIZE);
>  }
>  
>  static int proc_pid_auxv(struct task_struct *task, char *buffer)
> 

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