From: Geert Uytterhoeven <geert@linux-m68k.org>
To: David Laight <David.Laight@aculab.com>,
Kees Cook <keescook@chromium.org>
Cc: linux-m68k <linux-m68k@lists.linux-m68k.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-hardening@vger.kernel.org"
<linux-hardening@vger.kernel.org>
Subject: Re: [PATCH] m68k: Implement "current_stack_pointer"
Date: Thu, 24 Feb 2022 10:56:09 +0100 [thread overview]
Message-ID: <CAMuHMdU6msvi0j=mS28GFYbm+uMRk7PkYe+zOM4sDmOVxeibLQ@mail.gmail.com> (raw)
In-Reply-To: <95b9c3e8227a4892b26cc0384d1782c2@AcuMS.aculab.com>
Hi David, Kees,
On Thu, Feb 24, 2022 at 10:54 AM David Laight <David.Laight@aculab.com> wrote:
> From: Geert Uytterhoeven <geert@linux-m68k.org>
> > Sent: 24 February 2022 09:17
> >
> > On Thu, Feb 24, 2022 at 10:12 AM David Laight <David.Laight@aculab.com> wrote:
> > > From: Geert Uytterhoeven
> > > > Sent: 24 February 2022 08:59
> > > ...
> > > > > +register unsigned long current_stack_pointer __asm__("sp");
> > > >
> > > > I don't know what HARDENED_USERCOPY does, so I don't know if you need
> > > > "usp" (see rdusp()) or "sp"?
> > >
> > > HARDENED_USERCOPY significantly slows down some systems calls
> > > (especially things like sendmsg()) by trying to run-time verify
> > > that the kernel buffer doesn't overrun a stack frame or kmalloc()ed
> >
> > Kernel stack frame of user stack frame?
>
> Kernel, the kernel doesn't care if the user stack gets trashed.
OK.
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Kees: Do you want me to queue this in the m68k for-v5.18 branch, or do
you want to take it yourself, together with the HARDENED_USERCOPY work?
In case of the latter:
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Please let me know. Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2022-02-24 9:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-24 6:04 [PATCH] m68k: Implement "current_stack_pointer" Kees Cook
2022-02-24 8:59 ` Geert Uytterhoeven
2022-02-24 9:12 ` David Laight
2022-02-24 9:16 ` Geert Uytterhoeven
2022-02-24 9:54 ` David Laight
2022-02-24 9:56 ` Geert Uytterhoeven [this message]
2022-02-25 17:37 ` Kees Cook
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='CAMuHMdU6msvi0j=mS28GFYbm+uMRk7PkYe+zOM4sDmOVxeibLQ@mail.gmail.com' \
--to=geert@linux-m68k.org \
--cc=David.Laight@aculab.com \
--cc=keescook@chromium.org \
--cc=linux-hardening@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-m68k@lists.linux-m68k.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).