Re: [PATCH 0/1] devpts: use dynamic_dname() to generate proc name

[Stefan Lippers-Hollmann <s.l-h@gmx.de>]

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Hi

On 2017-08-23, Eric W. Biederman wrote:
> Linus Torvalds <torvalds@linux-foundation.org> writes:
> > On Wed, Aug 23, 2017 at 6:49 PM, Linus Torvalds <torvalds@linux-foundation.org> wrote:  
[...]
> This is so far untested (except for compiling) but I think this will
> work.
> 
> I factor out devpts_ptmx_path out of devpts_acquire so the code
> doesn't have to do unnecessary and confusing work, and add the
> new function devpts_mnt.
> 
> I revert the code to keep anything except a dentry in
> tty->link->driver_data.
> 
> And reduce the peer opening to a single function ptm_open_peer.
> 
> It takes lines of code but the result is very straightforward code.

I've given this a quick test, while it seems to fix the initial problem
with umounting /dev/ptmx, it does introduce a new one - trying to open 
an xterm (KDE5's konsole to be exact) doesn't open a shell (the shell 
window remains totally empty) and trying to ssh into the system fails 
with "PTY allocation request failed on channel 0", logging in via a 
real tty and creating a new pbuilder chroot from there succeeds.

Regards
	Stefan Lippers-Hollmann

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