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Date: Mon, 11 Aug 2014 10:24:09 +0100
From: Will Deacon <will.deacon@arm.com>
To: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Kees Cook <keescook@chromium.org>, Andy Lutomirski <luto@amacapital.net>,
        Deepak Saxena <dsaxena@linaro.org>, Will Drewry <wad@chromium.org>,
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        Lee Campbell <leecam@google.com>
Subject: Re: [PATCH v5 3/3] arm64: Add seccomp support
Message-ID: <20140811092409.GE15344@arm.com>
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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
> > <takahiro.akashi@linaro.org> 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.

Will