linux-kernel - Re: [PATCH] context_tracking: Restore previous state in schedule

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]

Message-ID: <20141204003024.GA17665@redhat.com>
Date:	Wed, 3 Dec 2014 19:30:24 -0500
From:	Dave Jones <davej@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Richard Guy Briggs <rgb@...hat.com>,
	Eric Paris <eparis@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] context_tracking: Restore previous state in schedule_user

On Wed, Dec 03, 2014 at 04:04:31PM -0800, Andy Lutomirski wrote:
 > On Wed, Dec 3, 2014 at 3:58 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
 > > On Wed, Dec 03, 2014 at 03:18:41PM -0800, Andy Lutomirski wrote:
 > >> It appears that some SCHEDULE_USER (asm for schedule_user) callers
 > >> in arch/x86/kernel/entry_64.S are called from RCU kernel context,
 > >> and schedule_user will return in RCU user context.  This causes RCU
 > >> warnings and possible failures.
 > >>
 > >> This is intended to be a minimal fix suitable for 3.18.
 > >>
 > >> Reported-by: Dave Jones <davej@...hat.com>
 > >> Cc: Oleg Nesterov <oleg@...hat.com>
 > >> Cc: Frédéric Weisbecker <fweisbec@...il.com>
 > >> Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>
 > >> Signed-off-by: Andy Lutomirski <luto@...capital.net>
 > >
 > > Ah, we sent it about at the same time :-)
 > >
 > > Might be too late for 3.18 though because it's not a regression.

Wait, so how come that trace didn't start showing up until recently ?

	Dave

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/