linux-kernel - Re: New kernel interface for sys

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.21.1908191548150.2147@nanos.tec.linutronix.de>
Date:   Mon, 19 Aug 2019 15:49:24 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Karel Zak <kzak@...hat.com>
cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lennart Poettering <mzxreary@...inter.de>,
        Arnd Bergmann <arnd@...db.de>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Florian Weimer <fweimer@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Alistair Francis <alistair.francis@....com>,
        GNU C Library <libc-alpha@...rceware.org>,
        OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: New kernel interface for sys_tz and timewarp?

On Mon, 19 Aug 2019, Thomas Gleixner wrote:
> On Mon, 19 Aug 2019, Karel Zak wrote:
> > On Wed, Aug 14, 2019 at 11:32:08AM +0200, Alexandre Belloni wrote:
> > > On 14/08/2019 11:09:36+0200, Lennart Poettering wrote:
> > > > On Mi, 14.08.19 10:31, Arnd Bergmann (arnd@...db.de) wrote:
> > > > 
> > > > > - glibc stops passing the caller timezone argument to the kernel
> > > > > - the distro kernel disables CONFIG_RTC_HCTOSYS,
> > > > >   CONFIG_RTC_SYSTOHC  and CONFIG_GENERIC_CMOS_UPDATE
> > > > 
> > > > What's the benefit of letting userspace do this? It sounds a lot more
> > > > fragile to leave this syncing to userspace if the kernel can do this
> > > > trivially on its own.
> > 
> > Good point, why CONFIG_RTC_SYSTOHC has been added to the kernel? 
> 
> 023f333a99ce ("NTP: Add a CONFIG_RTC_SYSTOHC configuration")

Just for the record. Not a single defconfig enables, but it's selected by
SPARC for whatever reason.

Thanks,

	tglx