linux-kernel - Re: [PATCH] mips: Fix gettimeofday() in the vdso library

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Message-ID: <5de56a84.1c69fb81.e0dc8.14af@mx.google.com>
Date:   Mon, 02 Dec 2019 11:48:19 -0800
From:   Paul Burton <paulburton@...nel.org>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
CC:     linux-mips@...r.kernel.org
Subject: Re: [PATCH] mips: Fix gettimeofday() in the vdso library

Hello,

Vincenzo Frascino wrote:
> The libc provides a discovery mechanism for vDSO library and its
> symbols. When a symbol is not exposed by the vDSOs the libc falls back
> on the system calls.
> 
> With the introduction of the unified vDSO library on mips this behavior
> is not honored anymore by the kernel in the case of gettimeofday().
> 
> The issue has been noticed and reported due to a dhclient failure on the
> CI20 board:
> 
> root@...ux:~# dhclient
> ../../../../lib/isc/unix/time.c:200: Operation not permitted
> root@...ux:~#
> 
> Restore the original behavior fixing gettimeofday() in the vDSO library.

Applied to mips-fixes.

> commit 7d2aa4bb90f5
> https://git.kernel.org/mips/c/7d2aa4bb90f5
> 
> Reported-by: H. Nikolaus Schaller <hns@...delico.com>
> Tested-by: H. Nikolaus Schaller <hns@...delico.com> # CI20 with JZ4780
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Signed-off-by: Paul Burton <paulburton@...nel.org>

Thanks,
    Paul

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