linux-kernel - Re: [PATCH] mm: Add additional consistency check

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Date:   Tue, 4 Apr 2017 14:13:06 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Michal Hocko <mhocko@...nel.org>
cc:     Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: Add additional consistency check

On Tue, 4 Apr 2017, Michal Hocko wrote:

> Yes, but we do not have to blow the kernel, right? Why cannot we simply
> leak that memory?

Because it is a serious bug to attempt to free a non slab object using
slab operations. This is often the result of memory corruption, coding
errs etc. The system needs to stop right there.