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From: Stefano Stabellini <sstabellini@kernel.org>
To: Julien Grall <julien.grall@linaro.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	andre.przywara@linaro.org, xen-devel@lists.xen.org
Subject: Re: [PATCH 4/7] xen/arm32: Add skeleton to harden branch predictor aliasing attacks
Date: Wed, 31 Jan 2018 08:40:27 -0800 (PST)	[thread overview]
Message-ID: <alpine.DEB.2.10.1801310840130.11958@sstabellini-ThinkPad-X260> (raw)
In-Reply-To: <e146fe16-5998-82e8-0722-952e4823582c@linaro.org>

On Wed, 31 Jan 2018, Julien Grall wrote:
> On 26/01/18 16:21, Julien Grall wrote:
> > > "Therefore hypervisor code running with guest vectors table should be
> > > minimized and always have interrupts and async aborts masked to reduce
> > > the risk to use them."
> > > 
> > > Do you think that it is clearer?
> > 
> > Well, that was covered by "interrupts". If you look at the Arm Arm, A, I, F
> > are considered all interrupts.
> 
> I reworked the paragraph and it is now:
> 
> "However, on arm32, each vector contain a single instruction. This means that
> the hardened vector tables may rely on the state of registers that does not
> hold when in the hypervisor (e.g SP is 8 bytes aligned). Therefore hypervisor
> code running with guest vectors table should be
> minimized and always have IRQ and SError masked to reduce the risk to use
> them."

I think it's much better, thanks!

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  reply	other threads:[~2018-01-31 16:40 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-19 13:40 [PATCH 0/7] xen/arm32: Branch predictor hardening (XSA-254 variant 2) Julien Grall
2018-01-19 13:40 ` [PATCH 1/7] xen/arm32: entry: Consolidate DEFINE_TRAP_ENTRY_* macros Julien Grall
2018-01-24 23:03   ` Stefano Stabellini
2018-01-19 13:40 ` [PATCH 2/7] xen/arm32: Add missing MIDR values for Cortex-A17 and A12 Julien Grall
2018-01-24 23:06   ` Stefano Stabellini
2018-01-19 13:40 ` [PATCH 3/7] xen/arm32: entry: Add missing trap_reset entry Julien Grall
2018-01-24 23:14   ` Stefano Stabellini
2018-01-25 11:24     ` Julien Grall
2018-01-19 13:41 ` [PATCH 4/7] xen/arm32: Add skeleton to harden branch predictor aliasing attacks Julien Grall
2018-01-24 23:54   ` Stefano Stabellini
2018-01-25 11:36     ` Julien Grall
2018-01-25 18:45       ` Stefano Stabellini
2018-01-25 18:50         ` Julien Grall
2018-01-25 19:37           ` Stefano Stabellini
2018-01-26 16:21             ` Julien Grall
2018-01-31 15:29               ` Julien Grall
2018-01-31 16:40                 ` Stefano Stabellini [this message]
2018-01-19 13:41 ` [PATCH 5/7] xen/arm32: Invalidate BTB on guest exit for Cortex A17 and 12 Julien Grall
2018-01-24 22:22   ` Konrad Rzeszutek Wilk
2018-01-24 22:28     ` Julien Grall
2018-01-25  1:02   ` Stefano Stabellini
2018-01-25 11:50     ` Julien Grall
2018-01-25 19:35       ` Stefano Stabellini
2018-01-31 15:31         ` Julien Grall
2018-01-31 16:40           ` Stefano Stabellini
2018-01-19 13:41 ` [PATCH 6/7] xen/arm32: Invalidate icache on guest exist for Cortex-A15 Julien Grall
2018-01-25  1:08   ` Stefano Stabellini
2018-01-19 13:41 ` [PATCH 7/7] xen/arm32: entry: Document the purpose of r11 in the traps handler Julien Grall
2018-01-25  1:08   ` Stefano Stabellini

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