linux-kernel - Re: [PATCH 1/2] powerpc: ptrace CHECK_FULL

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Date:	Tue, 25 Sep 2007 13:58:46 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Roland McGrath <roland@...hat.com>
Cc:	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	David Woodhouse <dwmw2@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] powerpc: ptrace CHECK_FULL_REGS


On Mon, 2007-09-24 at 17:59 -0700, Roland McGrath wrote:
> > Yup, I think I ditched most of them.. for some reason I decided it
> > couldn't happen, but maybe I'm wrong ?
> 
> Well, it's a BUG_ON.  It's supposed to be for something that "can't happen".
> That's why it's a sanity check, not a wild assertion. ;-)
> 
> The 2/2 patch is an example of a bug that CHECK_FULL_REGS catches.
> In the status quo, using PTRACE_PEEKUSR in a bug case crashes while using
> PTRACE_GETREGS in the same place might get bogus data.  (In the actual bug
> thus found, the data is not bogus and only the bit that FULL_REGS checks is.)

Fair enough.

Ben.


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