linux-kernel - Re: [patch 4/5] x86/vdso/32: Use 32bit syscall fallback

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Message-ID: <20190729145128.GB21120@linux.intel.com>
Date:   Mon, 29 Jul 2019 07:51:29 -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 4/5] x86/vdso/32: Use 32bit syscall fallback

On Sun, Jul 28, 2019 at 03:12:55PM +0200, Thomas Gleixner wrote:
> The generic VDSO implementation uses the Y2038 safe clock_gettime64() and
> clock_getres_time64() syscalls as fallback for 32bit VDSO. This breaks
> seccomp setups because these syscalls might be not (yet) allowed.
> 
> Implement the 32bit variants which use the legacy syscalls and select the
> variant in the core library.
> 
> The 64bit time variants are not removed because they are required for the
> time64 based vdso accessors.
> 
> Reported-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Reported-by: Paul Bolle <pebolle@...cali.nl>
> Suggested-by: Andy Lutomirski <luto@...nel.org>
> Fixes: 7ac870747988 ("x86/vdso: Switch to generic vDSO implementation")
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---

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