[PATCH v2 00/13] y2038: convert IPC syscalls

Fri Apr 13 00:20:11 AEST 2018

This is an update of a series I posted a long time ago [1], updating
the IPC subsystem to pass down 64-bit time stamps to user space.

In particular, for sys_msgctl, sys_semctl and sys_shmctl, I do not
introduce a completely new set of replacement system calls, but instead
extend the existing ones to return data in the reserved fields of the
normal data structure.

This should be completely transparent to any existing user space, and
only after the 32-bit time_t wraps, it will make a difference in the
returned data.

libc implementations will consequently have to provide their own data
structures when they move to 64-bit time_t, and convert the structures
in user space from the ones returned by the kernel.

There are three cases here:

- little-endian architectures (except powerpc and mips) can use
  the normal layout and just cast the data structure to the user space
  type that contains 64-bit numbers.

- parisc and sparc can do the same thing with big-endian user space

- little-endian powerpc and most big-endian architectures have
  to flip the upper and lower 32-bit halves of the time_t value in memory,
  but can otherwise keep using the normal layout

- mips and big-endian xtensa need to be more careful because
  they are not consistent in their definitions, and they have to provide
  custom libc implementations for the system calls to use 64-bit time_t.

Changes to the previous version include

- Rebased to the latest kernel (4.17-rc)

- Dropped changes for removed architectures

- Simplified the IPC code changes, based on prior work from
  both Deepa and Eric

- Fixed a few bugs that I found during rebasing, in parcular the
  sparc version was incorrect.

If everyone agrees with the series, I'd like to have it merged through
the tip tree once Deepa's earlier syscall series in there (I have both
in my y2038 tree [2]).

    Arnd

[1] https://lkml.org/lkml/2015/5/20/605
[2] git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git y2038-next

Arnd Bergmann (13):
  y2038: asm-generic: extend sysvipc data structures
  y2038: alpha: remove unneeded ipc uapi header files
  y2038: ia64: remove unneeded ipc uapi header files
  y2038: s390: remove unneeded ipc uapi header files
  y2038: arm64: extend sysvipc compat data structures
  y2038: mips: extend sysvipc data structures
  y2038: x86: extend sysvipc data structures
  y2038: parisc: extend sysvipc data structures
  y2038: sparc: extend sysvipc data structures
  y2038: powerpc: extend sysvipc data structures
  y2038: xtensa: extend sysvipc data structures
  y2038: ipc: use ktime_get_real_seconds consistently
  y2038: ipc: report long times to user space

Cc: linux-api at vger.kernel.org
Cc: linux-arch at vger.kernel.org
Cc: libc-alpha at sourceware.org
Cc: tglx at linutronix.de
Cc: deepa.kernel at gmail.com
Cc: viro at zeniv.linux.org.uk
Cc: ebiederm at xmission.com
Cc: albert.aribaud at 3adev.fr
Cc: linux-s390 at vger.kernel.org
Cc: schwidefsky at de.ibm.com
Cc: x86 at kernel.org
Cc: catalin.marinas at arm.com
Cc: will.deacon at arm.com
Cc: linux-mips at linux-mips.org
Cc: jhogan at kernel.org
Cc: ralf at linux-mips.org
Cc: linuxppc-dev at lists.ozlabs.org
Cc: sparclinux at vger.kernel.org

 arch/alpha/include/asm/Kbuild          |  4 +++
 arch/alpha/include/uapi/asm/ipcbuf.h   |  2 --
 arch/alpha/include/uapi/asm/msgbuf.h   | 28 -----------------
 arch/alpha/include/uapi/asm/sembuf.h   | 23 --------------
 arch/alpha/include/uapi/asm/shmbuf.h   | 39 -----------------------
 arch/arm64/include/asm/compat.h        | 32 +++++++++----------
 arch/ia64/include/asm/Kbuild           |  4 +++
 arch/ia64/include/uapi/asm/ipcbuf.h    |  2 --
 arch/ia64/include/uapi/asm/msgbuf.h    | 28 -----------------
 arch/ia64/include/uapi/asm/sembuf.h    | 23 --------------
 arch/ia64/include/uapi/asm/shmbuf.h    | 39 -----------------------
 arch/mips/include/asm/compat.h         | 38 ++++++++++++-----------
 arch/mips/include/uapi/asm/msgbuf.h    | 57 ++++++++++++++++++++++------------
 arch/mips/include/uapi/asm/sembuf.h    | 15 +++++++--
 arch/mips/include/uapi/asm/shmbuf.h    | 23 ++++++++++++--
 arch/parisc/include/asm/compat.h       | 32 +++++++++----------
 arch/parisc/include/uapi/asm/msgbuf.h  | 33 ++++++++++----------
 arch/parisc/include/uapi/asm/sembuf.h  | 16 +++++-----
 arch/parisc/include/uapi/asm/shmbuf.h  | 19 +++++-------
 arch/powerpc/include/asm/compat.h      | 32 +++++++++----------
 arch/powerpc/include/uapi/asm/msgbuf.h | 18 +++++------
 arch/powerpc/include/uapi/asm/sembuf.h | 14 ++++-----
 arch/powerpc/include/uapi/asm/shmbuf.h | 19 +++++-------
 arch/s390/include/asm/Kbuild           |  3 ++
 arch/s390/include/asm/compat.h         | 32 +++++++++----------
 arch/s390/include/uapi/asm/msgbuf.h    | 38 -----------------------
 arch/s390/include/uapi/asm/sembuf.h    | 30 ------------------
 arch/s390/include/uapi/asm/shmbuf.h    | 49 -----------------------------
 arch/sparc/include/asm/compat.h        | 32 +++++++++----------
 arch/sparc/include/uapi/asm/msgbuf.h   | 22 ++++++-------
 arch/sparc/include/uapi/asm/sembuf.h   | 16 +++++-----
 arch/sparc/include/uapi/asm/shmbuf.h   | 21 ++++++-------
 arch/x86/include/asm/compat.h          | 32 +++++++++----------
 arch/x86/include/uapi/asm/Kbuild       |  5 ++-
 arch/x86/include/uapi/asm/msgbuf.h     |  1 -
 arch/x86/include/uapi/asm/sembuf.h     | 11 ++++++-
 arch/x86/include/uapi/asm/shmbuf.h     |  1 -
 arch/xtensa/include/uapi/asm/msgbuf.h  | 25 +++++++--------
 arch/xtensa/include/uapi/asm/sembuf.h  | 17 +++++-----
 arch/xtensa/include/uapi/asm/shmbuf.h  | 37 +++++-----------------
 include/uapi/asm-generic/msgbuf.h      | 17 +++++-----
 include/uapi/asm-generic/sembuf.h      | 26 ++++++++++------
 include/uapi/asm-generic/shmbuf.h      | 17 +++++-----
 ipc/msg.c                              | 20 ++++++++----
 ipc/sem.c                              | 20 ++++++++----
 ipc/shm.c                              | 14 +++++++--
 46 files changed, 393 insertions(+), 633 deletions(-)
 delete mode 100644 arch/alpha/include/uapi/asm/ipcbuf.h
 delete mode 100644 arch/alpha/include/uapi/asm/msgbuf.h
 delete mode 100644 arch/alpha/include/uapi/asm/sembuf.h
 delete mode 100644 arch/alpha/include/uapi/asm/shmbuf.h
 delete mode 100644 arch/ia64/include/uapi/asm/ipcbuf.h
 delete mode 100644 arch/ia64/include/uapi/asm/msgbuf.h
 delete mode 100644 arch/ia64/include/uapi/asm/sembuf.h
 delete mode 100644 arch/ia64/include/uapi/asm/shmbuf.h
 delete mode 100644 arch/s390/include/uapi/asm/msgbuf.h
 delete mode 100644 arch/s390/include/uapi/asm/sembuf.h
 delete mode 100644 arch/s390/include/uapi/asm/shmbuf.h
 delete mode 100644 arch/x86/include/uapi/asm/msgbuf.h
 delete mode 100644 arch/x86/include/uapi/asm/shmbuf.h

-- 
2.9.0