Messages in this thread | | | Date | Wed, 6 Apr 2016 11:53:59 -0700 | Subject | Re: [PATCH] KERNEL: resource: Fix bug on leakage in /proc/iomem file | From | Kees Cook <> |
| |
On Wed, Apr 6, 2016 at 11:52 AM, Christian Kujau <lists@nerdbynature.de> wrote: > On Wed, 6 Apr 2016, ed@abdsec.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
| |