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Date: Mon, 12 Mar 2018 08:32:12 +0100
From: Jiri Slaby <>
To: Ben Hutchings <>,,
Cc:, Jinpu Wang <>,, Andy Lutomirski <>,
 Linus Torvalds <>,
 Jan Beulich <>,,
 Thomas Gleixner <>, Dan Williams
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.

suse labs

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