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]
Message-ID: <CAHk-=wiJj0AuV930QSxdBPz1RFSdLPdcxbY5KjqevKMAkJdBrg@mail.gmail.com>
Date: Thu, 8 Feb 2024 11:11:48 +0000
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Marco Elver <elver@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Matthieu Baerts <matttbe@...nel.org>, Alexander Potapenko <glider@...gle.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com, 
	Netdev <netdev@...r.kernel.org>, linux-hardening@...r.kernel.org, 
	Kees Cook <keescook@...omium.org>, "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: KFENCE: included in x86 defconfig?

On Thu, 8 Feb 2024 at 10:55, Borislav Petkov <bp@...en8.de> wrote:
>
> What about its benefit?
>
> I haven't seen a bug fix saying "found by KFENCE" or so but that doesn't
> mean a whole lot.

It does find some things. You can search for "BUG: KFENCE" on lore,
and there are real bug reports.

That said, there are real downsides too. Yes, you potentially find
bugs, but the act of finding the bugs might also cause issues. And
that means that anybody who enables KFENCE then needs to be willing to
deal with said issues and have the infrastructure to debug and report
them upstream.

I think that's the *real* cost there - KFENCE is likely a good idea,
but I'm not convinced it should be a defconfig thing, it should be a
conscious decision.

           Linus

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ