linux-kernel - Re: [patch V2 3/5] lib/vdso/32: Provide legacy syscall fallbacks

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Date:   Tue, 30 Jul 2019 07:28:05 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Kees Cook <keescook@...omium.org>,
        Paul Bolle <pebolle@...cali.nl>, Will Deacon <will@...nel.org>
Subject: Re: [patch V2 3/5] lib/vdso/32: Provide legacy syscall fallbacks

On Tue, Jul 30, 2019 at 11:38:50AM +0200, Thomas Gleixner 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.
> 
> Fixes: 00b26474c2f1 ("lib/vdso: Provide generic VDSO implementation")
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---

Reviewed-and-tested-by: Sean Christopherson <sean.j.christopherson@...el.com>