From: Thomas Gleixner <tglx@linutronix.de>
To: Andy Lutomirski <luto@kernel.org>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Kees Cook <keescook@chromium.org>,
Paul Bolle <pebolle@tiscali.nl>, Will Deacon <will@kernel.org>
Subject: Re: [patch V2 3/5] lib/vdso/32: Provide legacy syscall fallbacks
Date: Tue, 30 Jul 2019 22:14:11 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1907302212410.1786@nanos.tec.linutronix.de> (raw)
In-Reply-To: <CALCETrXmu8BtZ47AE-qo2bax9n1PyOM90yLSjkzE6rekbxv9zQ@mail.gmail.com>
On Tue, 30 Jul 2019, Andy Lutomirski wrote:
> On Tue, Jul 30, 2019 at 2:39 AM Thomas Gleixner <tglx@linutronix.de> wrote:
> >
> > To address the regression which causes seccomp to deny applications the
> > access to clock_gettime64() and clock_getres64() syscalls because they
> > are not enabled in the existing filters.
> >
> > That trips over the fact that 32bit VDSOs use the new clock_gettime64() and
> > clock_getres64() syscalls in the fallback path.
> >
> > Add a conditional to invoke the 32bit legacy fallback syscalls instead of
> > the new 64bit variants. The conditional can go away once all architectures
> > are converted.
> >
>
> I haven't surveyed all the architectures, but once everything is
> converted, shouldn't we use the 32-bit fallback for exactly the same
> set of architectures that want clock_gettime32 at all in the vdso?
Yes. That's why I want to remove the conditional once all all converted
over, that's x86/aaarg64 in mainline and a few in next.
Thanks,
tglx
next prev parent reply other threads:[~2019-07-30 20:14 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-28 13:12 [patch 0/5] lib/vdso, x86/vdso: Fix fallout from generic VDSO conversion Thomas Gleixner
2019-07-28 13:12 ` [patch 1/5] lib/vdso/32: Remove inconsistent NULL pointer checks Thomas Gleixner
2019-07-28 14:33 ` Andy Lutomirski
2019-07-28 14:42 ` Thomas Gleixner
2019-07-28 15:30 ` Vincenzo Frascino
2019-07-29 14:52 ` Sean Christopherson
2019-07-30 22:19 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2019-07-28 13:12 ` [patch 2/5] lib/vdso: Move fallback invocation to the callers Thomas Gleixner
2019-07-28 14:37 ` Andy Lutomirski
2019-07-28 15:31 ` Vincenzo Frascino
2019-07-30 22:19 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2019-07-28 13:12 ` [patch 3/5] lib/vdso/32: Provide legacy syscall fallbacks Thomas Gleixner
2019-07-28 14:39 ` Andy Lutomirski
2019-07-28 15:33 ` Vincenzo Frascino
2019-07-29 14:48 ` Sean Christopherson
2019-07-30 9:38 ` [patch V2 " Thomas Gleixner
2019-07-30 14:28 ` Sean Christopherson
2019-07-30 20:09 ` Andy Lutomirski
2019-07-30 20:14 ` Thomas Gleixner [this message]
2019-07-30 22:20 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2019-07-28 13:12 ` [patch 4/5] x86/vdso/32: Use 32bit syscall fallback Thomas Gleixner
2019-07-28 14:50 ` Andy Lutomirski
2019-07-29 11:23 ` Vincenzo Frascino
2019-07-29 14:51 ` Sean Christopherson
2019-07-30 22:21 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
2019-07-28 13:12 ` [patch 5/5] arm64: compat: vdso: Use legacy syscalls as fallback Thomas Gleixner
2019-07-28 15:35 ` Vincenzo Frascino
2019-07-30 22:22 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
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=alpine.DEB.2.21.1907302212410.1786@nanos.tec.linutronix.de \
--to=tglx@linutronix.de \
--cc=keescook@chromium.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=pebolle@tiscali.nl \
--cc=sean.j.christopherson@intel.com \
--cc=vincenzo.frascino@arm.com \
--cc=will@kernel.org \
--cc=x86@kernel.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).