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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

  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

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