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Date:	Tue, 5 Aug 2014 08:08:47 -0700
From:	Kees Cook <>
To:	AKASHI Takahiro <>
Cc:	Andy Lutomirski <>,
	Deepak Saxena <>,
	Will Drewry <>,,
	Will Deacon <>,
	Catalin Marinas <>,
	"" <>,
	Lee Campbell <>
Subject: Re: [PATCH v5 3/3] arm64: Add seccomp support

On Fri, Jul 25, 2014 at 2:37 AM, AKASHI Takahiro
<> wrote:
> I found a bug in my current patch (v5). When 32-bit tracer skips a system call,
> we should not update syscallno from x8 since syscallno is re-written directly
> via ptrace(PTRACE_SET_SYSCALL).

Ah, yes. Will aarch64 have a PTRACE_SET_SYSCALL option, or is this
strictly a 32-bit vs 64-bit issue?

> I'm sure that my next version should work with 32/64-bit tracers on 64-bit
> kernel.

Do you have a git tree uploaded anywhere? I'd love to follow this more
closely. When do you expect a v6?



Kees Cook
Chrome OS Security
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