linux-kernel - Re: [PATCH v4 3/4] exec: unify do_execve/compat_do

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:	Sat, 5 Mar 2011 22:20:51 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, pageexec@...email.hu,
	Solar Designer <solar@...nwall.com>,
	Eugene Teo <eteo@...hat.com>,
	Brad Spengler <spender@...ecurity.net>,
	Roland McGrath <roland@...hat.com>,
	Milton Miller <miltonm@....com>
Subject: Re: [PATCH v4 3/4] exec: unify do_execve/compat_do_execve code

On 03/05, Linus Torvalds wrote:
>
> Ok, everything looks fine to me.
>
> Except looking at this, I don't think this part:
>
> On Sat, Mar 5, 2011 at 12:31 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> >
> >  struct user_arg_ptr {
> > -       const char __user *const __user *native;
> > +#ifdef CONFIG_COMPAT
> > +       bool is_compat;
> > +#endif
> > +       union {
> > +               const char __user *const __user *native;
> > +               compat_uptr_t __user *compat;
> > +       } ptr;
> >  };
>
> will necessarily even compile on an architecture that doesn't have any
> 'compat' support.

Aaaaaaaaaaaaaaaaaah, now this is a really good point.

> Do we even define 'compat_uptr_t' for that case? I don't think so.

Indeed, you are right.

What I was thinking about? I do not know.

> So I suspect you need two of those annoying #ifdef's.

please expect v5 tomorrow.

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/