linux-hardening - Re: [PATCH] printf: Remove unused 'bprintf'

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Message-ID: <Zv1ZN8XZmSZTD-78@gallifrey>
Date: Wed, 2 Oct 2024 14:31:19 +0000
From: "Dr. David Alan Gilbert" <linux@...blig.org>
To: Andy Shevchenko <andy@...nel.org>
Cc: kees@...nel.org, akpm@...ux-foundation.org, pmladek@...e.com,
	rostedt@...dmis.org, linux@...musvillemoes.dk,
	senozhatsky@...omium.org, linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] printf: Remove unused 'bprintf'

* Andy Shevchenko (andy@...nel.org) wrote:
> On Wed, Oct 02, 2024 at 02:21:25AM +0100, linux@...blig.org wrote:
> > From: "Dr. David Alan Gilbert" <linux@...blig.org>
> > 
> > bprintf is unused.  Remove it.
> 
> bprintf()

OK.

> > It was added in
> > commit 4370aa4aa753 ("vsprintf: add binary printf")
> > 
> > but as far as I can see was never used, unlike the other
> > two functions in that patch.
> 
> Please, rewrap these lines to use more room on each line.

Something like this? :

bprintf() is unused.  Remove it.  It was added in

commit 4370aa4aa753 ("vsprintf: add binary printf")

but as far as I can see was never used, unlike the other two functions in
that patch.


> ...
> 
> I am not familiar with tricks in BPF or ftrace code where this actually might
> be implicitly called via a macro, but brief grep gives nothing that might point
> to that.

I've got an all-yes build (well, most after I took out broken stuff) booting
with it, and it has CONFIG_BINARY_PRINTF=y and CONFIG_FTRACE=y .

trace_seq.c uses seq_buf_bprintf which uses bstr_printf rather than the plain
bprintf() that I've deleted.
Not sure where to dig in BPF, but I've had a fairly good grep around.

> Hence, with the amended commit message
> 
> Reviewed-by: Andy Shevchenko <andy@...nel.org>

Thanks!

> P.S. I hope we may rely in CIs to report issues soon, if any.

Sure

Dave

> -- 
> With Best Regards,
> Andy Shevchenko
> 
> 
> 
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\        dave @ treblig.org |                               | In Hex /
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