mips: fix shmctl/semctl/msgctl syscall for o32

The commit 275f22148e87 ("ipc: rename old-style shmctl/semctl/msgctl
syscalls") switched various architectures to use sys_old_*ctl() with
ipc_parse_version, including mips n32/n64. However, for mips o32, commit
0d6040d46817 ("arch: add split IPC system calls where needed") added
separate IPC syscalls without properly using the old-style handlers.

This causes applications using uClibc-ng to fail with -EINVAL when
calling semctl/shmctl/msgctl with IPC_64 flag, as uClibc-ng uses the
syscall numbers from kernel headers to determine whether to use the IPC
multiplexer or split syscalls. In contrast, glibc is unaffected as it
uses a unified feature test macro __ASSUME_DIRECT_SYSVIPC_SYSCALLS
(disabled for mips-o32) to make this decision.

Fix this by switching the o32 ABI entries for semctl, shmctl and msgctl
to use the old-style handlers, matching the behavior of other
architectures and fixing compatibility with uClibc-ng.

Signed-off-by: Ism Hong <ism.hong@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 349b8aad1159f404103bd2057a1e64e9bf309f18..e8a57c2067580618f4635f9582bcec4c4b2a92c5 100644 (file)
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -382,15 +382,15 @@
 368    o32     io_pgetevents                   sys_io_pgetevents_time32        compat_sys_io_pgetevents
 # room for arch specific calls
 393    o32     semget                          sys_semget
-394    o32     semctl                          sys_semctl                      compat_sys_semctl
+394    o32     semctl                          sys_old_semctl          compat_sys_old_semctl
 395    o32     shmget                          sys_shmget
-396    o32     shmctl                          sys_shmctl                      compat_sys_shmctl
+396    o32     shmctl                          sys_old_shmctl          compat_sys_old_shmctl
 397    o32     shmat                           sys_shmat                       compat_sys_shmat
 398    o32     shmdt                           sys_shmdt
 399    o32     msgget                          sys_msgget
 400    o32     msgsnd                          sys_msgsnd                      compat_sys_msgsnd
 401    o32     msgrcv                          sys_msgrcv                      compat_sys_msgrcv
-402    o32     msgctl                          sys_msgctl                      compat_sys_msgctl
+402    o32     msgctl                          sys_old_msgctl          compat_sys_old_msgctl
 403    o32     clock_gettime64                 sys_clock_gettime               sys_clock_gettime
 404    o32     clock_settime64                 sys_clock_settime               sys_clock_settime
 405    o32     clock_adjtime64                 sys_clock_adjtime               sys_clock_adjtime