linux-kernel - Re: [PATCH v2 2/2] module: Add module name to modinfo

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Message-ID: <161cb1b4-ccdc-fba1-c272-45b8ed261cb2@jonmasters.org>
Date:   Tue, 25 Apr 2017 03:00:42 -0400
From:   Jon Masters <jcm@...masters.org>
To:     Kees Cook <keescook@...omium.org>, Jessica Yu <jeyu@...hat.com>
Cc:     Rusty Russell <rusty@...tcorp.com.au>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Nicholas Piggin <npiggin@...il.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        linux-kernel@...r.kernel.org,
        Lucas De Marchi <lucas.demarchi@...el.com>
Subject: Re: [PATCH v2 2/2] module: Add module name to modinfo

On 04/21/2017 06:35 PM, Kees Cook wrote:

> Accessing the mod structure (e.g. for mod->name) prior to having completed
> check_modstruct_version() can result in writing garbage to the error logs
> if the layout of the mod structure loaded from disk doesn't match the
> running kernel's mod structure layout. This kind of mismatch will become
> much more likely if a kernel is built with different randomization seed
> for the struct layout randomization plugin.
> 
> Instead, add and use a new modinfo string for logging the module name.

+Lucas - probably something that the modinfo kmod utility should track.

Jon.