linux-kernel - Re: [patch] Fix argument check for PR_SET

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>] [day] [month] [year] [list]

Date:	Tue, 24 Jan 2012 00:00:34 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Michael Kerrisk <mtk.manpages@...il.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, mtk.man-pages@...il.com
Subject: Re: [patch] Fix argument check for PR_SET_MM

On Tue, Jan 24, 2012 at 08:51:50AM +1300, Michael Kerrisk wrote:
> From: Michael Kerrisk <mtk.manpages@...il.com>
> 
> Cyrill,
> 
> I imagine that the small operator fix below gives the behavior you intended.
> Please apply.
> 
> Thanks,
> 
> Michael
> 
> Signed-off-by: Michael Kerrisk <mtk.manpages@...il.com>
> 
> --- kernel/sys.c.orig	2012-01-24 07:26:44.986370466 +1300
> +++ kernel/sys.c	2012-01-24 07:27:52.202703776 +1300
> @@ -1703,7 +1703,7 @@ static int prctl_set_mm(int opt, unsigne
>  	int error = 0;
>  	struct mm_struct *mm = current->mm;
>  
> -	if (arg4 | arg5)
> +	if (arg4 || arg5)
>  		return -EINVAL;
>  
>  	if (!capable(CAP_SYS_ADMIN))
> 

Hi Michael, thanks. But actually (arg4 | arg5) will give nonzero result
if any of operands is not a zero ;) So no error here. From readability pov
sure this will be clear. Thanks, I'll update.

	Cyrill
--
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/