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

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Message-Id: <20141107230503.846942C3B00@topped-with-meat.com>
Date:	Fri,  7 Nov 2014 15:05:03 -0800 (PST)
From:	Roland McGrath <roland@...k.frob.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <will.deacon@....com>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>
Subject: Re: [RFC] ptrace: add generic SET_SYSCALL request

Not that I'm actually involved any more, but I'd endorse the user_regset
approach and not the new request.  On many (most?) machines, it's already
part of the main integer regset (orig_rax et al) and adding another
mechanism is redundant.  Using user_regset also means there won't be a word
of hidden state that is not visible in core dumps.
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