linux-kernel - Re: [PATCH] x86/module: Fixed bug allowing invalid relocation addresses.

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Message-ID: <20200316125824.GB12561@hirez.programming.kicks-ass.net>
Date:   Mon, 16 Mar 2020 13:58:24 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Gilad Wharton Kleinman <dkgs1998@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/module: Fixed bug allowing invalid relocation
 addresses.

On Sat, Mar 14, 2020 at 11:36:26PM +0200, Gilad Wharton Kleinman wrote:
> If a kernel module with a bad relocation offset is loaded to a x86 kernel,
> the kernel will apply the relocation to a address not inside the module
> (resulting in memory in the kernel being overridden).

Why !?

If you load a bad module it's game over anyway. At best this protects us
from broken toolchains.