linux-kernel - Re: [PATCH v2 tip/core/rcu 0/13] Sparse-related updates for 3.13

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: <20131009221805.GA11709@jtriplet-mobl1>
Date:	Wed, 9 Oct 2013 15:18:05 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, sbw@....edu,
	fengguang.wu@...el.com, stephen@...workplumber.org,
	davem@...emloft.net, bridge@...ts.linux-foundation.org,
	netdev@...r.kernel.org, tgraf@...g.ch, gaofeng@...fujitsu.com,
	linux-decnet-user@...ts.sourceforge.net, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	linville@...driver.com, johannes@...solutions.net
Subject: Re: [PATCH v2 tip/core/rcu 0/13] Sparse-related updates for 3.13

On Wed, Oct 09, 2013 at 02:29:20PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series features updates to allow sparse to do a better job of
> statically analyzing RCU usage:
> 
> 1.	Apply ACCESS_ONCE() to rcu_assign_pointer()'s target to prevent
> 	comiler mischief.  Also require that the source pointer be from
> 	the kernel address space.  Sometimes it can be from the RCU address
> 	space, which necessitates the remaining patches in this series.
> 	Which, it must be admitted, apply to a very small fraction of
> 	the rcu_assign_pointer() invocations in the kernel.  This commit
> 	courtesy of Josh Triplett.
> 
> 2-13.	Apply rcu_access_pointer() to avoid a number of false positives.

I would suggest moving patch 1 to the end of the series, to avoid
introducing and subsequently fixing warnings.

- Josh Triplett
--
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/