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    Subject[PATCH 4.4 051/104] mips: fix n32 compat_ipc_parse_version
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Arnd Bergmann <arnd@arndb.de>

    commit 5a9372f751b5350e0ce3d2ee91832f1feae2c2e5 upstream.

    While reading through the sysvipc implementation, I noticed that the n32
    semctl/shmctl/msgctl system calls behave differently based on whether
    o32 support is enabled or not: Without o32, the IPC_64 flag passed by
    user space is rejected but calls without that flag get IPC_64 behavior.

    As far as I can tell, this was inadvertently changed by a cleanup patch
    but never noticed by anyone, possibly nobody has tried using sysvipc
    on n32 after linux-3.19.

    Change it back to the old behavior now.

    Fixes: 78aaf956ba3a ("MIPS: Compat: Fix build error if CONFIG_MIPS32_COMPAT but no compat ABI.")
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Paul Burton <paul.burton@mips.com>
    Cc: linux-mips@vger.kernel.org
    Cc: stable@vger.kernel.org # 3.19+
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

    --- a/arch/mips/Kconfig
    +++ b/arch/mips/Kconfig
    @@ -2972,6 +2972,7 @@ config MIPS32_O32
    config MIPS32_N32
    bool "Kernel support for n32 binaries"
    depends on 64BIT
    + select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
    select COMPAT
    select MIPS32_COMPAT
    select SYSVIPC_COMPAT if SYSVIPC

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