linux-kernel - Re: [PATCH] ARM: kprobes: Avoid fortify_panic() when copying optprobe template

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Message-Id: <eab147a6-4bc6-491d-aaaf-61526c4df5ff@www.fastmail.com>
Date:   Tue, 19 May 2020 09:52:48 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Masami Hiramatsu" <mhiramat@...nel.org>,
        "Kees Cook" <keescook@...omium.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        "Russell King" <linux@...linux.org.uk>, labbott@...hat.com,
        mathieu.desnoyers@...icios.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: kprobes: Avoid fortify_panic() when copying optprobe template



On Mon, 18 May 2020, at 11:50, Masami Hiramatsu wrote:
> On Sun, 17 May 2020 14:48:52 -0700
> Kees Cook <keescook@...omium.org> wrote:
> 
> > On Mon, May 18, 2020 at 01:09:59AM +0930, Andrew Jeffery wrote:
> > > As mentioned, a couple of attempts have been made to address the issue
> > > by casting a pointer to optprobe_template_entry before providing it to
> > > memcpy(), however gccs such as Ubuntu 20.04's arm-linux-gnueabi-gcc
> > > 9.3.0 (Ubuntu 9.3.0-10ubuntu1) see through these efforts.
> > 
> > Ah, dang. :P
> > 
> > How about converting them all to unsized arrays, which would also allow
> > the code to drop the "&" everywhere, I think. This is untested:
> > 
> 
> This looks good to me since it uses same technique in sections.h.
> 
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> 

Kees,

Were you planning to send resend this, or were you looking for me to polish it
up?

Andrew