linux-hardening - Re: [PATCH] tty: mxser: Remove __counted_by from mxser

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Message-ID: <2024053008-sadly-skydiver-92be@gregkh>
Date: Thu, 30 May 2024 09:40:13 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Jiri Slaby <jirislaby@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>, linux-serial@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org, llvm@...ts.linux.dev,
	patches@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: [PATCH] tty: mxser: Remove __counted_by from mxser_board.ports[]

On Thu, May 30, 2024 at 08:22:03AM +0200, Jiri Slaby wrote:
> >  This will be an error in a future compiler version [-Werror,-Wbounds-safety-counted-by-elt-type-unknown-size]
> >      291 |         struct mxser_port ports[] __counted_by(nports);
> >          |         ^~~~~~~~~~~~~~~~~~~~~~~~~
> >    1 error generated.
> > 
> > Remove this use of __counted_by to fix the warning/error. However,
> > rather than remove it altogether, leave it commented, as it may be
> > possible to support this in future compiler releases.
> 
> This looks like a compiler bug/deficiency.

I agree, why not just turn that option off in the compiler so that these
"warnings" will not show up?

> What does gcc say BTW?
> 
> > Cc: stable@...r.kernel.org
> > Closes: https://github.com/ClangBuiltLinux/linux/issues/2026
> > Fixes: f34907ecca71 ("mxser: Annotate struct mxser_board with __counted_by")
> 
> I would not say "Fixes" here. It only works around a broken compiler.

Agreed, don't add Fixes: for this, it's a compiler bug, not a kernel
issue.

thanks,

greg k-h