From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Roland McGrath <roland@redhat.com>
Cc: David Woodhouse <dwmw2@redhat.com>,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
Paul Mackerras <paulus@samba.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 1/2] powerpc: ptrace CHECK_FULL_REGS
Date: Tue, 25 Sep 2007 13:58:46 +1000 [thread overview]
Message-ID: <1190692726.31978.0.camel@localhost.localdomain> (raw)
In-Reply-To: <20070925005945.02E924D04B7@magilla.localdomain>
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.
prev parent reply other threads:[~2007-09-25 3:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-24 23:50 [PATCH 1/2] powerpc: ptrace CHECK_FULL_REGS Roland McGrath
2007-09-25 0:33 ` Benjamin Herrenschmidt
2007-09-25 0:59 ` Roland McGrath
2007-09-25 3:58 ` Benjamin Herrenschmidt [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1190692726.31978.0.camel@localhost.localdomain \
--to=benh@kernel.crashing.org \
--cc=akpm@linux-foundation.org \
--cc=dwmw2@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=paulus@samba.org \
--cc=roland@redhat.com \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).