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Date: Mon, 12 Mar 2018 08:32:12 +0100
From: Jiri Slaby <jslaby@...e.cz>
To: Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Cc: akpm@...ux-foundation.org, Jinpu Wang <jinpu.wang@...fitbricks.com>,
 kernel-hardening@...ts.openwall.com, Andy Lutomirski <luto@...nel.org>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Jan Beulich <JBeulich@...e.com>, alan@...ux.intel.com,
 Thomas Gleixner <tglx@...utronix.de>, Dan Williams
 <dan.j.williams@...el.com>, gregkh@...uxfoundation.org,
 linux-arch@...r.kernel.org
Subject: Re: [PATCH 3.16 56/76] x86/syscall: Sanitize syscall table
 de-references under speculation

On 03/12/2018, 04:06 AM, Ben Hutchings wrote:
> In 3.16 the x86_32 syscall table lookup is also written in assembly.
> So I've taken Jiri's version and added similar masking in entry_32.S,
> using edx as the temporary.  edx is clobbered by SAVE_REGS and seems
> to be free at this point.

I don't know the state in 3.16, but in 3.12, I had to fix the 32bit
entry on 64bit in arch/x86/ia32/ia32entry.S (ia32_sysenter_target &
others) too.

thanks,
-- 
js
suse labs

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