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Message-Id: <1190692726.31978.0.camel@localhost.localdomain>
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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