linux-kernel - Re: [PATCH] x86/microcode: Do not select FW

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 10 Jun 2020 20:41:13 +1000
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        x86-ml <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] x86/microcode: Do not select FW_LOADER

On Wed, Jun 10, 2020 at 12:34:18PM +0200, Borislav Petkov wrote:
> 
> Out Kconfig symbols space is a mess and I'd prefer not to add another
> one if there's no good reason for it.

Adding two thousand lines of code to the kernel when you only need
a few lines is ridiculous.  Worse those two thousand lines increase
the attack surface to the kernel because they're exposed to user-
space.

Adding a hidden Kconfig symbol for the sake of reducing the kernel
attack surface would seem worthwhile.  In fact this isn't even an
issue right now because you are still using the custom function.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt