linux-kernel - Re: [PATCH] perf: Fix intel shared extra msr allocation

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]

Date:	Tue, 05 Jun 2012 12:14:31 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Yan, Zheng" <zheng.z.yan@...ux.intel.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: Fix intel shared extra msr allocation

On Fri, 2012-06-01 at 22:11 +0800, Yan, Zheng wrote:
> 
> The real problem is from __intel_shared_reg_put_constraints(). it set
> reg->alloc to 0 

ok

> and decreases fake_cpuc->shared_regs->regs[reg->idx]'s
> reference count. 

So? That's fake state, who cares what its left in?

> Later when deleting the event,  put_constraints() will find
> reg->alloc is 0 and it won't decrease the shared msr's reference count.

OK, so the only problem is us setting reg->alloc to 0?
--
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/