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Message-ID: <20110907095508.GA16114@albatros>
Date: Wed, 7 Sep 2011 13:55:08 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: kernel-hardening@...ts.openwall.com
Subject: Re: [RFC] x86, mm: start mmap allocation for
libs from low addresses
Solar,
On Wed, Sep 07, 2011 at 13:43 +0400, Solar Designer wrote:
> On Wed, Sep 07, 2011 at 01:34:11PM +0400, Vasiliy Kulikov wrote:
> > On Wed, Sep 07, 2011 at 13:30 +0400, Solar Designer wrote:
> > > What if mmap_min_addr set really low, or is even 0? I think we want to
> > > skip low addresses even if processes are permitted to use those.
> > > (Permitted does not mean encouraged.) So how about ASCII_ARMOR_MIN_ADDR
> > > 0x19000 (100 KB) when !CONFIG_VM86?
> >
> > Are you talking about safety with NULL pointer dereferencing?
>
> Yes.
OK, fully agree. But why 100 KB? Probably 0x10000 (64 KB)? It looks
nicer and not so magic.
--
Vasiliy
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