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Date:   Thu, 10 Jan 2019 17:24:31 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     y2038@...ts.linaro.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, ink@...assic.park.msu.ru,
        mattst88@...il.com, linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, tony.luck@...el.com, fenghua.yu@...el.com,
        geert@...ux-m68k.org, monstr@...str.eu, paul.burton@...s.com,
        deller@....de, mpe@...erman.id.au, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, dalias@...c.org, davem@...emloft.net,
        luto@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, jcmvbkbc@...il.com,
        firoz.khan@...aro.org, ebiederm@...ssion.com,
        deepa.kernel@...il.com, linux@...inikbrodowski.net,
        akpm@...ux-foundation.org, dave@...olabs.net,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH 11/15] mips: fix n32 compat_ipc_parse_version

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.")
Cc: stable@...r.kernel.org
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
As stated above, this was only found by inspection, the patch is not
tested. Please review accordingly.
---
 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 787290781b8c..0d14f51d0002 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -3155,6 +3155,7 @@ 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
-- 
2.20.0

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