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Date:	Mon, 11 Aug 2014 10:24:09 +0100
From:	Will Deacon <>
To:	AKASHI Takahiro <>
Cc:	Kees Cook <>,
	Andy Lutomirski <>,
	Deepak Saxena <>,
	Will Drewry <>,
	"" <>,
	Catalin Marinas <>,
	"" <>,
	Lee Campbell <>
Subject: Re: [PATCH v5 3/3] arm64: Add seccomp support

On Fri, Aug 08, 2014 at 08:35:42AM +0100, AKASHI Takahiro wrote:
> On 08/06/2014 12:08 AM, Kees Cook wrote:
> > 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?
> As discussed in a few weeks ago, aarch64 won't support PTRACE_SET_SYSCALL.

Well, I don't think anything was set in stone. If you have a compelling
reason why adding the new request gives you something over setting w8
directly, then we can extend ptrace.

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