Re: [PATCH stable v2 0/2] termios: Alpha BOTHER/IBSHIFT, tty_baudrate fix

[Johan Hovold]

On Sun, Oct 07, 2018 at 09:06:18PM -0700, H. Peter Anvin wrote:
> From: "H. Peter Anvin (Intel)" <hpa@xxxxxxxxx>
> 
> 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