linux-kernel - Re: [PATCH] Allow Kconfig to set default mmap_min

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Message-ID: <20071221223438.GB24780@kroah.com>
Date:	Fri, 21 Dec 2007 14:34:38 -0800
From:	Greg KH <greg@...ah.com>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	jmorris@...ei.org, alan@...hat.com, chrisw@...hat.com,
	akpm@...ux-foundation.org, linux-security-module@...r.kernel.org,
	solar@...nwall.com, wtarreau@...a.kernel.org
Subject: Re: [PATCH] Allow Kconfig to set default mmap_min_addr protection

On Fri, Dec 21, 2007 at 10:10:24PM +0100, Jan Engelhardt wrote:
> 
> On Dec 21 2007 15:31, Eric Paris wrote:
> >On Thu, 2007-12-20 at 00:29 +0100, Jan Engelhardt wrote:
> >> On Dec 19 2007 16:59, Eric Paris wrote:
> >> >
> >> >+config SECURITY_DEFAULT_MMAP_MIN_ADDR
> >> >+        int "Low address space to protect from user allocation"
> >> 
> >> Hm, should not this be 'hex'?
> >
> >I guess it could be, but the input for /proc/sys/vm/mmap_min_addr is
> >base 10 as well
> 
> sysfs is autobase, i.e. echo "0xb000" >/sys/foo will Do The Right Thing.

Hm, no, that is not sysfs doing this, and sysfs is not autobase in all
places.  That is sysctl (/proc/sys/), not sysfs.

thanks,

greg k-h
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