linux-kernel - Re: [REGRESSION][BISECTED] erroneous buffer overflow detected in bch2_xattr

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Message-ID: <202410031422.72F54BE4@keescook>
Date: Thu, 3 Oct 2024 14:23:20 -0700
From: Kees Cook <kees@...nel.org>
To: Thorsten Blum <thorsten.blum@...lux.com>
Cc: Jan Hendrik Farr <kernel@...rr.cc>, kent.overstreet@...ux.dev,
	regressions@...ts.linux.dev, linux-bcachefs@...r.kernel.org,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
	ardb@...nel.org, morbo@...gle.com
Subject: Re: [REGRESSION][BISECTED] erroneous buffer overflow detected in
 bch2_xattr_validate

On Wed, Oct 02, 2024 at 11:18:57AM +0200, Thorsten Blum wrote:
> On 28. Sep 2024, at 22:34, Kees Cook <kees@...nel.org> wrote:
> > [...]
> > 
> > Sorry, I've been out of commission with covid. Globally disabling this
> > macro for clang is not the right solution (way too big a hammer).
> > 
> > Until Bill has a fix, we can revert commit
> > 86e92eeeb23741a072fe7532db663250ff2e726a, as the problem is limited to
> > certain situations where 'counted_by' is in use.
> 
> I already encountered two other related __counted_by() issues [1][2]
> that are now being reverted. Would it be an option to disable it
> globally, but only for Clang < v19 (where it looks like it'll be fixed)?

Yeah, once we have a solid fix (so we have a known Clang version to
target), I'll want counted_by disabled in versions prior to that.

-- 
Kees Cook