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From: Jarkko Sakkinen <jarkko@kernel.org>
To: Sean Christopherson <seanjc@google.com>
Cc: linux-sgx@vger.kernel.org, dave.hansen@intel.com,
	kai.huang@intel.com, haitao.huang@intel.com,
	stable@vger.kernel.org,
	Haitao Huang <haitao.huang@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Jethro Beekman <jethro@fortanix.com>
Subject: Re: [PATCH v4] x86/sgx: Fix the call order of synchronize_srcu() in sgx_release()
Date: Thu, 21 Jan 2021 02:29:42 +0200	[thread overview]
Message-ID: <YAjK9n6zct2VTp74@kernel.org> (raw)
In-Reply-To: <YAhp4Jrj6hIcvgRC@google.com>

On Wed, Jan 20, 2021 at 09:35:28AM -0800, Sean Christopherson wrote:
> On Fri, Jan 15, 2021, jarkko@kernel.org wrote:
> > From: Jarkko Sakkinen <jarkko@kernel.org>
> > 
> > The most trivial example of a race condition can be demonstrated with this
> > example where mm_list contains just one entry:
> > 
> > CPU A                   CPU B
> > sgx_release()
> >                         sgx_mmu_notifier_release()
> >                         list_del_rcu()
> > sgx_encl_release()
> >                         synchronize_srcu()
> > cleanup_srcu_struct()
> > 
> > To fix this, call synchronize_srcu() before checking whether mm_list is
> > empty in sgx_release().
> 
> Why haven't you included the splat that Haitao provided?  That would go a long
> way to helping answer Boris' question about exactly what is broken...

I've lost the klog.

/Jarkko

  reply	other threads:[~2021-01-21  0:52 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-15  1:46 [PATCH v4] x86/sgx: Fix the call order of synchronize_srcu() in sgx_release() jarkko
2021-01-15  7:18 ` Borislav Petkov
2021-01-16  5:12   ` Jarkko Sakkinen
2021-01-18 18:57     ` Borislav Petkov
2021-01-20 14:43       ` Jarkko Sakkinen
2021-01-20 17:34         ` Dave Hansen
2021-01-21  0:26           ` Jarkko Sakkinen
2021-01-22 18:20             ` Haitao Huang
2021-01-20 17:35 ` Sean Christopherson
2021-01-21  0:29   ` Jarkko Sakkinen [this message]
2021-01-21  1:19     ` Dave Hansen
2021-01-21 12:55       ` Jarkko Sakkinen
2021-01-21 18:19         ` Dave Hansen
2021-01-22 16:56   ` Dave Hansen
2021-01-23  8:58     ` Jarkko Sakkinen
2021-01-25 15:49       ` Dave Hansen
2021-01-27 17:31         ` Jarkko Sakkinen

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