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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