Patchwork Patch "y2038: Make CONFIG_64BIT_TIME unconditional" has been added to the 5.1-stable tree

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Submitter gregkh@linuxfoundation.org
Date May 23, 2019, 6:02 p.m.
Message ID <1558634552191167@kroah.com>
Download mbox | patch
Permalink /patch/32832/
State New
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gregkh@linuxfoundation.org - May 23, 2019, 6:02 p.m.
This is a note to let you know that I've just added the patch titled

    y2038: Make CONFIG_64BIT_TIME unconditional

to the 5.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     y2038-make-config_64bit_time-unconditional.patch
and it can be found in the queue-5.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From f3d964673b2f1c5d5c68c77273efcf7103eed03b Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 29 Apr 2019 15:19:37 +0200
Subject: y2038: Make CONFIG_64BIT_TIME unconditional

From: Arnd Bergmann <arnd@arndb.de>

commit f3d964673b2f1c5d5c68c77273efcf7103eed03b upstream.

As Stepan Golosunov points out, there is 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 the conversion was done, it was only turned
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, the #ifdef
CONFIG_64BIT_TIME can be removed completely..

Note: for native 32-bit mode, no change is needed, this works as
designed and user space should never need to clear the upper 32
bits of the tv_nsec field, in or out of the kernel.

Fixes: 00bf25d693e7 ("y2038: use time32 syscall names on 32-bit")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Joseph Myers <joseph@codesourcery.com>
Cc: libc-alpha@sourceware.org
Cc: linux-api@vger.kernel.org
Cc: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: Lukasz Majewski <lukma@denx.de>
Cc: Stepan Golosunov <stepan@golosunov.pp.ru>
Link: https://lore.kernel.org/lkml/20190422090710.bmxdhhankurhafxq@sghpc.golosunov.pp.ru/
Link: https://lkml.kernel.org/r/20190429131951.471701-1-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)



Patches currently in stable-queue which might be from arnd@arndb.de are

queue-5.1/y2038-make-config_64bit_time-unconditional.patch
queue-5.1/media-seco-cec-fix-building-with-rc_core-m.patch

Patch

--- 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