lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 23 Aug 2017 18:49:38 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Stefan Lippers-Hollmann <s.l-h@....de>,
        Christian Brauner <christian.brauner@...onical.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Thorsten Leemhuis <regressions@...mhuis.info>
Subject: Re: [PATCH 0/1] devpts: use dynamic_dname() to generate proc name

On Wed, Aug 23, 2017 at 6:32 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> It should all be _fairly_ straightforward, but it's definitely a
> rather bigger change than that "just fix the path" patch was.

Argh. And it's *not* fairly straightforward, because the
tty_operations "ioctl()" function pointer only gets 'struct tty *'.

So in the TIOCGPTPEER path, we don't actually have access to the file
pointer of the fd we're doing the ioctl on.

And that's where the 'struct path' to the 'ptmx' node is - which we
need to then look up the 'pts' directory.

How very annoying. I think that's why we did it all at ptmx_open()
time, because then we had all the information.

                Linus

Powered by blists - more mailing lists