linux-kernel - Re: [patch v2 3/4] x86, ptrace: prepare regset get/set routines for user specified lengths

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Date:	Tue,  9 Feb 2010 17:32:24 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, hjl.tools@...il.com
Subject: Re: [patch v2 3/4] x86, ptrace: prepare regset get/set routines for user specified lengths

This change is unnecessary and IMHO misguided.  The arch user_regset.get
and user_regset.set functions are not required to worry about bogus
arguments.  Their callers are required to pass values that don't violate
the .n, .size, and .align constraints in the user_regset.  The right place
to enforce these constraints on parameters coming from userland is in the
arch-independent code that calls the arch user_regset functions.

Thanks,
Roland
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