Date: Wed, 14 Sep 2011 12:27:44 -0700 From: Kees Cook <kees@...ntu.com> To: Vasiliy Kulikov <segoon@...nwall.com> Cc: kernel-hardening@...ts.openwall.com, Andrew Morton <akpm@...ux-foundation.org>, Cyrill Gorcunov <gorcunov@...il.com>, Al Viro <viro@...iv.linux.org.uk>, Christoph Lameter <cl@...ux-foundation.org>, Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [RFC PATCH 2/2] mm: restrict access to /proc/slabinfo Hi Vasiliy, On Sat, Sep 10, 2011 at 08:41:34PM +0400, Vasiliy Kulikov wrote: > Historically /proc/slabinfo has 0444 permissions and is accessible to > the world. slabinfo contains rather private information related both to > the kernel and userspace tasks. Depending on the situation, it might > reveal either private information per se or information useful to make > another targeted attack. Some examples of what can be learned by > reading/watching for /proc/slabinfo entries: > ... > World readable slabinfo simplifies kernel developers' job of debugging > kernel bugs (e.g. memleaks), but I believe it does more harm than > benefits. For most users 0444 slabinfo is an unreasonable attack vector. > > Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com> Haven't had any mass complaints about the 0400 in Ubuntu (sorry Dave!), so I'm obviously for it. Reviewed-by: Kees Cook <kees@...ntu.com> -Kees -- Kees Cook Ubuntu Security Team
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