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: 78aaf95 ("MIPS: Compat: Fix build error if CONFIG_MIPS32_COMPAT but no compat ABI.") Signed-off-by: Arnd Bergmann <[email protected]> Signed-off-by: Paul Burton <[email protected]> Cc: [email protected] Cc: [email protected] # 3.19+
wangyan0507 · Jan 11, 2019 · 5a9372f · 5a9372f
1 parent a214720
commit 5a9372f
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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