Date: Wed, 6 Apr 2016 11:53:59 -0700 From: Kees Cook <keescook@...omium.org> To: Christian Kujau <lists@...dbynature.de> Cc: Emrah Demir <ed@...sec.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Dan Rosenberg <dan.j.rosenberg@...il.com>, Dave Jones <davej@...hat.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] KERNEL: resource: Fix bug on leakage in /proc/iomem file On Wed, Apr 6, 2016 at 11:52 AM, Christian Kujau <lists@...dbynature.de> wrote: > On Wed, 6 Apr 2016, ed@...sec.com wrote: >> First, I wrote your attached patch, but then I thought zeroing other >> /proc/iomem values would be better. So I changed it. > > On my systems, /proc/iomem, /proc/ioports and others get their > world-readable bits removed during bootup - I guess that would mitigate > this issue too? Yeah, I think that'd be sufficient (that's the first patch I suggested). It's not a strong as kptr_restrict since kptr_restrict has mode "2", but ... I think that's some diminishing returns... -Kees -- Kees Cook Chrome OS & Brillo Security
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