linux-kernel - Re: [PATCH stable v2 0/2] termios: Alpha BOTHER/IBSHIFT, tty

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Message-ID: <20181008153458.GY3774@localhost>
Date:   Mon, 8 Oct 2018 17:34:58 +0200
From:   Johan Hovold <johan@...nel.org>
To:     "H. Peter Anvin" <hpa@...or.com>
Cc:     linux-kernel@...r.kernel.org,
        Tobias Klausmann <klausman@...warzvogel.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        linux-alpha@...r.kernel.org, linux-serial@...r.kernel.org,
        Johan Hovold <johan@...nel.org>,
        Alan Cox <alan@...rguk.ukuu.org.uk>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, stable@...r.kernel.org
Subject: Re: [PATCH stable v2 0/2] termios: Alpha BOTHER/IBSHIFT,
 tty_baudrate fix

On Sun, Oct 07, 2018 at 09:06:18PM -0700, H. Peter Anvin wrote:
> From: "H. Peter Anvin (Intel)" <hpa@...or.com>
> 
> It turns out that Alpha is the only architecture that never
> implemented BOTHER and IBSHIFT, which is otherwise ages old. This is
> one thing that has held up glibc support for this feature (all other
> architectures have supported these for about a decade, at least before
> the current 3.2 glibc cutoff.)
> 
> Furthermore, in the process of dealing with this, I discovered that
> the current code in tty_baudrate.c can read past the end of the
> baud_table[] on Alpha and PowerPC. The second patch in this series
> fixes that, but it also cleans up the code substantially by
> auto-generating the table and, since all architectures now have them,
> removing all conditionals for BOTHER and IBSHIFT existing.
> 
> Tagging for stable because these are concrete and immediate
> problems.

This isn't stable material in its current form. If you want to plug the
alpha and powerpc info leaks in the stable trees, then you need a
minimal fix for that, which you can then your clean ups and new features
on.

Johan