linux-kernel - [PATCHv2 0/4] tty: Hold write ldisc sem in tty

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-next>] [day] [month] [year] [list]

Message-Id: <20180903165257.29227-1-dima@arista.com>
Date:   Mon,  3 Sep 2018 17:52:53 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Dmitry Safonov <dima@...sta.com>,
        Daniel Axtens <dja@...ens.net>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Michael Neuling <mikey@...ling.org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Nathan March <nathan@...net>,
        Pasi Kärkkäinen <pasik@....fi>,
        Peter Hurley <peter@...leysoftware.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Tan Xiaojun <tanxiaojun@...wei.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, stable@...r.kernel.org,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        syzbot+3aa9784721dfb90e984d@...kaller.appspotmail.com
Subject: [PATCHv2 0/4] tty: Hold write ldisc sem in tty_reopen()

The first two fixes are worth to have in stables as we've hit it
on v4.9 stable.

And for linux-next - adding lockdep asserts for line discipline changing
code, verifying that write ldisc sem will be held forthwith.

Changes since v1:
- Added tested-by/reported-by tags
- Dropped 3/4 (locking tty pair for lockdep sake),
  Because of that - not adding lockdep_assert_held() in tty_ldisc_open()
- Added 4/4 cleanup to inc tty->count only on success of
  tty_ldisc_reinit()
- lock ldisc without (5*HZ) timeout in tty_reopen()

v1 link: 
lkml.kernel.org/r/<20180829022353.23568-1-dima@...sta.com>

Huuge cc list:
Cc: Daniel Axtens <dja@...ens.net>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Michael Neuling <mikey@...ling.org>
Cc: Mikulas Patocka <mpatocka@...hat.com>
Cc: Nathan March <nathan@...net>
Cc: Pasi Kärkkäinen <pasik@....fi>
Cc: Peter Hurley <peter@...leysoftware.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc: Tan Xiaojun <tanxiaojun@...wei.com>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
(please, ignore if I Cc'ed you mistakenly)

Dmitry Safonov (4):
  tty: Drop tty->count on tty_reopen() failure
  tty: Hold tty_ldisc_lock() during tty_reopen()
  tty/lockdep: Add ldisc_sem asserts
  tty: Simplify tty->count math in tty_reopen()

 drivers/tty/tty_io.c    | 12 ++++++++----
 drivers/tty/tty_ldisc.c |  5 +++++
 2 files changed, 13 insertions(+), 4 deletions(-)

-- 
2.13.6