linux-kernel - [PATCH 0/6] posix-cpu-timers: Bunch of fixes

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]

Date:   Fri,  4 Jun 2021 13:31:53 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 0/6] posix-cpu-timers: Bunch of fixes 

The first is a race due to locklessly starting process wide cputime
counting.

The others stop the process wide cputime counting and tick dependency
when they are not necessary anymore.

Note I don't really like patch 5/6 and in fact I hope we could manage to
remove this early inline cpu_timer_fire() call from timer_settime(). All
we get from it is headaches. Besides, the handler isn't invoked from the
actual target and that doesn't sound ideal.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/urgent

HEAD: f8f908c9d2b2f1e100cd549206c95a4e65e5f023

Thanks,
	Frederic
---

Frederic Weisbecker (6):
      posix-cpu-timers: Fix rearm racing against process tick
      posix-cpu-timers: Don't start process wide cputime counter if timer is disabled
      posix-cpu-timers: Force next_expiration recalc after timer deletion
      posix-cpu-timers: Force next_expiration recalc after timer reset
      posix-cpu-timers: Force next expiration recalc after early timer firing
      posix-cpu-timers: Force next expiration recalc after itimer reset


 include/linux/posix-timers.h   | 11 ++++-
 kernel/time/posix-cpu-timers.c | 97 +++++++++++++++++++++++++++++++++---------
 2 files changed, 87 insertions(+), 21 deletions(-)