From patchwork Fri Apr 26 14:25:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 32425 Received: (qmail 96048 invoked by alias); 26 Apr 2019 14:25:52 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 96035 invoked by uid 89); 26 Apr 2019 14:25:51 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-13.5 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 spammy=5.1, 2200, HX-Spam-Relays-External:ESMTPA, HContent-Transfer-Encoding:8bit X-HELO: mout.kundenserver.de From: Arnd Bergmann To: Thomas Gleixner Cc: Joseph Myers , libc-alpha@sourceware.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, Deepa Dinamani , Arnd Bergmann , Lukasz Majewski , Stepan Golosunov Subject: [PATCH 1/2] y2038: make CONFIG_64BIT_TIME unconditional Date: Fri, 26 Apr 2019 16:25:04 +0200 Message-Id: <20190426142531.1378357-1-arnd@arndb.de> MIME-Version: 1.0 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 Cc: Stepan Golosunov Signed-off-by: Arnd Bergmann --- Please apply this one as a bugfix for 5.1 --- arch/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/Kconfig b/arch/Kconfig index 33687dddd86a..9092e0ffe4d3 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -764,7 +764,7 @@ config COMPAT_OLD_SIGACTION bool config 64BIT_TIME - def_bool ARCH_HAS_64BIT_TIME + def_bool y help This should be selected by all architectures that need to support new system calls with a 64-bit time_t. This is relevant on all 32-bit