linux-kernel - Re: [patch 3/5] lib/vdso/32: Provide legacy syscall fallbacks

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Date:   Sun, 28 Jul 2019 07:39:01 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Paul Bolle <pebolle@...cali.nl>, Will Deacon <will@...nel.org>
Subject: Re: [patch 3/5] lib/vdso/32: Provide legacy syscall fallbacks

On Sun, Jul 28, 2019 at 6:20 AM Thomas Gleixner <tglx@...utronix.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.
>
> Implement a __cvdso_clock_get*time32() variants which invokes the legacy
> 32bit syscalls when the architecture requests it.
>
> The conditional can go away once all architectures are converted.

Reviewed-by: Andy Lutomirski <luto@...nel.org>