linux-kernel - [PATCH v2 0/4] nsproxy: support CLONE

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Date:   Mon,  6 Jul 2020 17:49:08 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andrei Vagin <avagin@...il.com>,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        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>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: [PATCH v2 0/4] nsproxy: support CLONE_NEWTIME with setns()

Hey,

After having synced with Andrei with the ARM time namespace support
patchset we've decided to make vdso_join_timens() a function that cannot
fail but not yet change its return type so the changes for ARM can
proceed independently. We will simply have a follow-up patch right after
these changes land during the v5.9 merge window that changes
vdso_join_timens() from returning an int to void.

So far setns() with pidfds 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().

Thanks!
Christian

Christian Brauner (4):
  timens: make vdso_join_timens() always succeed
  timens: add timens_commit() helper
  nsproxy: support CLONE_NEWTIME with setns()
  tests: add CLONE_NEWTIME setns tests

 arch/x86/entry/vdso/vma.c                     |  5 +-
 include/linux/time_namespace.h                |  6 ++
 kernel/nsproxy.c                              | 21 ++++-
 kernel/time/namespace.c                       | 22 ++----
 tools/testing/selftests/pidfd/pidfd.h         |  4 +
 .../selftests/pidfd/pidfd_setns_test.c        | 76 +++++++++++++++++++
 6 files changed, 115 insertions(+), 19 deletions(-)

base-commit: dcb7fd82c75ee2d6e6f9d8cc71c52519ed52e258
-- 
2.27.0