Unverified Commit 5a9372f7 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Paul Burton
Browse files

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: 78aaf956 ("MIPS: Compat: Fix build error if CONFIG_MIPS32_COMPAT but no compat ABI.")
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Cc: stable@vger.kernel.org # 3.19+
parent a214720c

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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