linux-kernel - Re: [PATCH] n_tty: fix redirected_tty_write checks after write

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Message-ID: <CAHk-=wiScU+tS8ZSL2-gpuKB5Z-XKLOGkF8WW=bL-8t_KSqxFg@mail.gmail.com>
Date:   Mon, 25 Jan 2021 12:08:02 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] n_tty: fix redirected_tty_write checks after write_iter conversion

On Mon, Jan 25, 2021 at 12:03 PM Sami Tolvanen <samitolvanen@...gle.com> wrote:
>
> Neither, I noticed this because the conflicting function declarations
> broke Clang's Control Flow Integrity checking.

Ahh, interesting. Is that automated somewhere, or are you running your
own special checks? It sounds like a useful thing.

I was thinking that maybe I should make some sparse-based cross-file
checker, but it sounds like -fsanitize=cfi (or whatever it is you do)
catches it.

              Linus