linux-kernel - Re: [RFC] ptrace: add generic SET

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Message-ID: <20141112111352.GC26437@arm.com>
Date:	Wed, 12 Nov 2014 11:13:52 +0000
From:	Will Deacon <will.deacon@....com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	"roland@...k.frob.com" <roland@...k.frob.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"keescook@...omium.org" <keescook@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] ptrace: add generic SET_SYSCALL request

On Wed, Nov 12, 2014 at 11:06:59AM +0000, AKASHI Takahiro wrote:
> On 11/12/2014 08:00 PM, Will Deacon wrote:
> > On Wed, Nov 12, 2014 at 10:46:01AM +0000, AKASHI Takahiro wrote:
> >> On 11/07/2014 11:04 PM, Oleg Nesterov wrote:
> >>> To me the fact that PTRACE_SET_SYSCALL can be undefined and syscall_set_nr()
> >>> is very much arch-dependant (but most probably trivial) means that this  code
> >>> should live in arch_ptrace().
> >>
> >> Thinking of Oleg's comment above, it doesn't make sense neither to define generic
> >> NT_SYSTEM_CALL (user_regset) in uapi/linux/elf.h and implement it in ptrace_regset()
> >> in kernel/ptrace.c with arch-defined syscall_(g)set_nr().
> >>
> >> Since we should have the same interface on arm and arm64, we'd better implement
> >> ptrace(PTRACE_SET_SYSCALL) locally on arm64 for now (as I originally submitted).
> >
> > I think the regset approach is cleaner. We already do something similar for
> > TLS. That would be implemented under arch/arm64/ with it's own NT type.
> 
> Okey, so arm64 goes its own way :)
> Or do you want to have a similar regset on arm, too?
> (In this case, NT_ARM_SYSTEM_CALL can be shared in uapi/linux/elf.h)

Just do arm64. We already have the dedicated request for arch/arm/.

Will
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