linux-kernel - Re: [PATCH 1/2] y2038: make CONFIG_64BIT

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Date:   Mon, 29 Apr 2019 09:33:59 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Arnd Bergmann <arnd@...db.de>
cc:     Joseph Myers <joseph@...esourcery.com>, libc-alpha@...rceware.org,
        linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        Deepa Dinamani <deepa.kernel@...il.com>,
        Lukasz Majewski <lukma@...x.de>,
        Stepan Golosunov <stepan@...osunov.pp.ru>
Subject: Re: [PATCH 1/2] y2038: make CONFIG_64BIT_TIME unconditional

On Fri, 26 Apr 2019, Arnd Bergmann wrote:

> As Stepan Golosunov points out, we made a small mistake in the
> get_timespec64() function in the kernel. It was originally added under
> the assumption that CONFIG_64BIT_TIME would get enabled on all 32-bit
> and 64-bit architectures, but when I did the conversion, I only turned
> it on for 32-bit ones.
> 
> The effect is that the get_timespec64() function never clears the upper
> half of the tv_nsec field for 32-bit tasks in compat mode. Clearing this
> is required for POSIX compliant behavior of functions that pass a
> 'timespec' structure with a 64-bit tv_sec and a 32-bit tv_nsec, plus
> uninitialized padding.
> 
> The easiest fix for linux-5.1 is to just make the Kconfig symbol
> unconditional, as it was originally intended. As a follow-up,
> we should remove any #ifdef CONFIG_64BIT_TIME completely.
> 
> Link: https://lore.kernel.org/lkml/20190422090710.bmxdhhankurhafxq@sghpc.golosunov.pp.ru/
> Cc: Lukasz Majewski <lukma@...x.de>
> Cc: Stepan Golosunov <stepan@...osunov.pp.ru>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> Please apply this one as a bugfix for 5.1

Can you provide a 'Fixes: ....' tag please?

Thanks,

	tglx