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Open Source and information security mailing list archives
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Date: Wed, 15 Jan 2020 15:33:47 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Jason Gunthorpe <jgg@...pe.ca> Cc: Christoph Hellwig <hch@....de>, linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, Waiman Long <longman@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-ext4@...r.kernel.org, cluster-devel@...hat.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: RFC: hold i_rwsem until aio completes On Wed, Jan 15, 2020 at 09:24:28AM -0400, Jason Gunthorpe wrote: > I was interested because you are talking about allowing the read/write side > of a rw sem to be held across a return to user space/etc, which is the > same basic problem. No it is not; allowing the lock to be held across userspace doesn't change the owner. This is a crucial difference, PI depends on there being a distinct owner. That said, allowing the lock to be held across userspace still breaks PI in that it completely wrecks the ability to analyze the critical section.
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