linux-kernel - Re: [RFC 2/2] prctl: PR_SET_MM -- Introduce PR_SET_MM

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Date:	Fri, 4 Jul 2014 12:11:51 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Vagin <avagin@...allels.com>
Cc:	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Vagin <avagin@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [RFC 2/2] prctl: PR_SET_MM -- Introduce PR_SET_MM_MAP operation

On Fri, Jul 04, 2014 at 11:52:56AM +0400, Andrew Vagin wrote:
> > +
> > +struct prctl_mm_map {
> > +	unsigned long	start_code;
> 
> "unsigned long" has different sizes on x86_64 and x86, so a compat
> is required for x32 processes on x64 kernel.

Yes, good point. I think we can use u64/32 types instead to make
a code shared. I'll update once I collect all comments about
aproach.

> > +
> > +	/*
> > +	 * Stack, brk, command line arguments and environment must exist.
> > +	 */
> > +	stack_vma = find_vma(mm, prctl_map->start_stack);
> 
> Why do we not use __prctl_check_vma here?

Well __prctl_check_vma does return error or zero while I need this
vma reference for stack rlim check which is done below in code.
> 
> > +	if (!stack_vma) {
> > +		error = -EINVAL;
> > +		goto out;
> > +	}
> > +#define __prctl_check_vma(mm, addr) find_vma(mm, addr) ? 0 : -EINVAL
> > +	error |= __prctl_check_vma(mm, prctl_map->start_brk);
> > +	error |= __prctl_check_vma(mm, prctl_map->brk);

	Cyrill
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