linux-kernel - Re: [PATCH v5 3/3] arm64: Add seccomp support

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Message-ID: <20140811092409.GE15344@arm.com>
Date:	Mon, 11 Aug 2014 10:24:09 +0100
From:	Will Deacon <will.deacon@....com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>,
	Deepak Saxena <dsaxena@...aro.org>,
	Will Drewry <wad@...omium.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lee Campbell <leecam@...gle.com>
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
> > <takahiro.akashi@...aro.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
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