linux-kernel - [PATCH 0/3] nsproxy: support CLONE

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Message-Id: <20200619153559.724863-1-christian.brauner@ubuntu.com>
Date:   Fri, 19 Jun 2020 17:35:56 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        x86@...nel.org
Cc:     Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Serge Hallyn <serge@...lyn.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Dmitry Safonov <dima@...sta.com>,
        Andrei Vagin <avagin@...il.com>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: [PATCH 0/3] nsproxy: support CLONE_NEWTIME with setns()

Hey,

So far setns() was missing time namespace support. This was partially
due to it simply not being implemented but also because
vdso_join_timens() could still fail which made switching to multiple
namespaces atomically problematic. This series first fixes
vdso_join_timens() to never fail, introduces timens_commit() and finally
adds CLONE_NEWTIME support for setns().

Please note, that arm is currently in the process of adding
vdso_join_timens() support (cf. [1]) so it might make sense to split the
vdso_join_timens() change out and route it to mainline as a fix so both
my series and the arm support can be rebased on top of it. I've Cced the
relevant people and I'm also replying to the arm thread now.

[1]: https://lore.kernel.org/lkml/20200602180259.76361-1-avagin@gmail.com/

Thanks!
Christian

Christian Brauner (3):
  timens: make vdso_join_timens() always succeed
  timens: add timens_commit() helper
  nsproxy: support CLONE_NEWTIME with setns()

 arch/x86/entry/vdso/vma.c      |  6 ++----
 include/linux/time_namespace.h | 13 +++++++++----
 kernel/nsproxy.c               | 21 +++++++++++++++++++--
 kernel/time/namespace.c        | 22 ++++++++--------------
 4 files changed, 38 insertions(+), 24 deletions(-)

base-commit: b3a9e3b9622ae10064826dccb4f7a52bd88c7407
-- 
2.27.0