linux-kernel - Re: perf_fuzzer compiled for x32 causes reboot

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20140228215150.GM11910@linux.vnet.ibm.com>
Date:	Fri, 28 Feb 2014 13:51:50 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: perf_fuzzer compiled for x32 causes reboot

On Fri, Feb 28, 2014 at 10:27:00PM +0100, Peter Zijlstra wrote:
> On Fri, Feb 28, 2014 at 01:17:33PM -0800, Paul E. McKenney wrote:
> > This code isn't running in idle context is it?  If so, RCU will happily
> > free out from under it.  CONFIG_PROVE_RCU should detect this sort of thing,
> > though.
> 
> Well, interrupts/NMIs can happen when idle, but the interrupt/NMI
> entry code deals with the idle state AFAIK.

Yep, rcu_irq_enter() and rcu_nmi_enter() deal with that.  More worried
about this being code invoked from some energy-efficiency driver or
another within the idle loop.

							Thanx, Paul

--
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/