linux-hardening - Re: Linux: Use-After-Free exploitation

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Message-ID: <202206221605.EA67203C58@keescook>
Date:   Wed, 22 Jun 2022 16:06:18 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Muni Sekhar <munisekharrms@...il.com>
Cc:     linux-hardening@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Linux: Use-After-Free exploitation

On Wed, Jun 22, 2022 at 11:38:39AM +0530, Muni Sekhar wrote:
> Use-After-Free bugs result in kernel crashes. If these bugs result in
> kernel crashes then how is it possible to exploit this vulnerability
> for local privilege escalation?

There are many examples of manipulating memory layout in a way that an
attacker can control. For example, see:
https://googleprojectzero.blogspot.com/2021/10/how-simple-linux-kernel-memory.html

-- 
Kees Cook