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From: Dave Hansen <>
To: Jarkko Sakkinen <>,
Cc:, Sean Christopherson <>,
	Haitao Huang <>,
	Thomas Gleixner <>,
	Ingo Molnar <>, Borislav Petkov <>,, "H. Peter Anvin" <>,
	Jethro Beekman <>,
Subject: Re: [PATCH v5] x86/sgx: Fix use-after-free in sgx_mmu_notifier_release()
Date: Wed, 3 Feb 2021 07:46:48 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 1/30/21 11:20 AM, Jarkko Sakkinen wrote:
> Example scenario would such that all removals "side-channel" through
> the notifier callback. Then mmu_notifier_unregister() gets called
> exactly zero times. No MMU notifier srcu sync would be then happening.
> NOTE: There's bunch of other examples, I'm just giving one.

Could you flesh this out a bit?  I don't quite understand the scenario
from what you describe above.

In any case, I'm open to other implementations that fix the race we know
about.  If you think you have a better fix, I'm happy to review it and
make sure it closes the other race.

  parent reply	other threads:[~2021-02-03 15:47 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-28 12:58 [PATCH v5] x86/sgx: Fix use-after-free in sgx_mmu_notifier_release() Jarkko Sakkinen
2021-01-28 16:33 ` Dave Hansen
2021-01-30 19:20   ` Jarkko Sakkinen
2021-01-30 19:26     ` Jarkko Sakkinen
2021-02-03 15:46     ` Dave Hansen [this message]
2021-02-03 21:54       ` Jarkko Sakkinen

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