[PATCH] generic 32 bit emulation for System-V IPC

From: Arnd Bergmann <arnd@arndb.de>

Adds a generic implementation of 32 bit emulation for IPC system calls.  The
code is based on the existing implementations for sparc64, ia64, mips, s390,
ppc and x86_64, which can subsequently be converted to use this.

arch/ia64/Kconfig

@@ -538,6 +538,10 @@ config DEBUG_INFO
 	  Say Y here only if you plan to use gdb to debug the kernel.
 	  If you don't debug the kernel, you can say N.
 
+config SYSVIPC_COMPAT
+	bool
+	depends on COMPAT && SYSVIPC
+	default y
 endmenu
 
 source "security/Kconfig"

arch/s390/Kconfig

@@ -143,6 +143,11 @@ config COMPAT
 	depends on S390_SUPPORT
 	default y
 
+config SYSVIPC_COMPAT
+	bool
+	depends on COMPAT && SYSVIPC
+	default y
+
 config BINFMT_ELF32
 	tristate "Kernel support for 31 bit ELF binaries"
 	depends on S390_SUPPORT

arch/x86_64/Kconfig

@@ -387,6 +387,10 @@ config COMPAT
 	depends on IA32_EMULATION
 	default y
 
+config SYSVIPC_COMPAT
+	bool
+	depends on COMPAT && SYSVIPC
+	default y
 
 config UID16
 	bool

include/asm-ia64/compat.h

@@ -11,6 +11,7 @@ typedef u32		compat_size_t;
 typedef s32		compat_ssize_t;
 typedef s32		compat_time_t;
 typedef s32		compat_clock_t;
+typedef s32		compat_key_t;
 typedef s32		compat_pid_t;
 typedef u16		compat_uid_t;
 typedef u16		compat_gid_t;
@@ -116,6 +117,64 @@ typedef u32		compat_sigset_word;
 #define COMPAT_OFF_T_MAX	0x7fffffff
 #define COMPAT_LOFF_T_MAX	0x7fffffffffffffffL
 
+struct compat_ipc64_perm {
+	compat_key_t key;
+	compat_uid32_t uid;
+	compat_gid32_t gid;
+	compat_uid32_t cuid;
+	compat_gid32_t cgid;
+	unsigned short mode;
+	unsigned short __pad1;
+	unsigned short seq;
+	unsigned short __pad2;
+	compat_ulong_t unused1;
+	compat_ulong_t unused2;
+};
+
+struct compat_semid64_ds {
+	struct compat_ipc64_perm sem_perm;
+	compat_time_t  sem_otime;
+	compat_ulong_t __unused1;
+	compat_time_t  sem_ctime;
+	compat_ulong_t __unused2;
+	compat_ulong_t sem_nsems;
+	compat_ulong_t __unused3;
+	compat_ulong_t __unused4;
+};
+
+struct compat_msqid64_ds {
+	struct compat_ipc64_perm msg_perm;
+	compat_time_t  msg_stime;
+	compat_ulong_t __unused1;
+	compat_time_t  msg_rtime;
+	compat_ulong_t __unused2;
+	compat_time_t  msg_ctime;
+	compat_ulong_t __unused3;
+	compat_ulong_t msg_cbytes;
+	compat_ulong_t msg_qnum;
+	compat_ulong_t msg_qbytes;
+	compat_pid_t   msg_lspid;
+	compat_pid_t   msg_lrpid;
+	compat_ulong_t __unused4;
+	compat_ulong_t __unused5;
+};
+
+struct compat_shmid64_ds {
+	struct compat_ipc64_perm shm_perm;
+	compat_size_t  shm_segsz;
+	compat_time_t  shm_atime;
+	compat_ulong_t __unused1;
+	compat_time_t  shm_dtime;
+	compat_ulong_t __unused2;
+	compat_time_t  shm_ctime;
+	compat_ulong_t __unused3;
+	compat_pid_t   shm_cpid;
+	compat_pid_t   shm_lpid;
+	compat_ulong_t shm_nattch;
+	compat_ulong_t __unused4;
+	compat_ulong_t __unused5;
+};
+
 /*
  * A pointer passed in from user mode. This should not be used for syscall parameters,
  * just declare them as pointers because the syscall entry code will have appropriately

include/asm-s390/compat.h

@@ -15,6 +15,8 @@ typedef s32		compat_clock_t;
 typedef s32		compat_pid_t;
 typedef u16		compat_uid_t;
 typedef u16		compat_gid_t;
+typedef u32		compat_uid32_t;
+typedef u32		compat_gid32_t;
 typedef u16		compat_mode_t;
 typedef u32		compat_ino_t;
 typedef u16		compat_dev_t;
@@ -25,6 +27,7 @@ typedef u16		compat_ipc_pid_t;
 typedef s32		compat_daddr_t;
 typedef u32		compat_caddr_t;
 typedef __kernel_fsid_t	compat_fsid_t;
+typedef s32		compat_key_t;
 typedef s32		compat_timer_t;
 
 typedef s32		compat_int_t;
@@ -135,4 +138,61 @@ static inline void *compat_alloc_user_space(long len)
 	return (void *) (stack - len);
 }
 
+struct compat_ipc64_perm {
+	compat_key_t key;
+	compat_uid32_t uid;
+	compat_gid32_t gid;
+	compat_uid32_t cuid;
+	compat_gid32_t cgid;
+	compat_mode_t mode;
+	unsigned short __pad1;
+	unsigned short seq;
+	unsigned short __pad2;
+	unsigned int __unused1;
+	unsigned int __unused2;
+};
+
+struct compat_semid64_ds {
+	struct compat_ipc64_perm sem_perm;
+	compat_time_t  sem_otime;
+	compat_ulong_t __pad1;
+	compat_time_t  sem_ctime;
+	compat_ulong_t __pad2;
+	compat_ulong_t sem_nsems;
+	compat_ulong_t __unused1;
+	compat_ulong_t __unused2;
+};
+
+struct compat_msqid64_ds {
+	struct compat_ipc64_perm msg_perm;
+	compat_time_t   msg_stime;
+	compat_ulong_t __pad1;
+	compat_time_t   msg_rtime;
+	compat_ulong_t __pad2;
+	compat_time_t   msg_ctime;
+	compat_ulong_t __pad3;
+	compat_ulong_t msg_cbytes;
+	compat_ulong_t msg_qnum;
+	compat_ulong_t msg_qbytes;
+	compat_pid_t   msg_lspid;
+	compat_pid_t   msg_lrpid;
+	compat_ulong_t __unused1;
+	compat_ulong_t __unused2;
+};
+
+struct compat_shmid64_ds {
+	struct compat_ipc64_perm shm_perm;
+	compat_size_t  shm_segsz;
+	compat_time_t  shm_atime;
+	compat_ulong_t __pad1;
+	compat_time_t  shm_dtime;
+	compat_ulong_t __pad2;
+	compat_time_t  shm_ctime;
+	compat_ulong_t __pad3;
+	compat_pid_t   shm_cpid;
+	compat_pid_t   shm_lpid;
+	compat_ulong_t shm_nattch;
+	compat_ulong_t __unused1;
+	compat_ulong_t __unused2;
+};
 #endif /* _ASM_S390X_COMPAT_H */

include/asm-x86_64/compat.h

@@ -29,6 +29,7 @@ typedef s32		compat_daddr_t;
 typedef u32		compat_caddr_t;
 typedef __kernel_fsid_t	compat_fsid_t;
 typedef u32		compat_timer_t;
+typedef s32		compat_key_t;
 
 typedef s32		compat_int_t;
 typedef s32		compat_long_t;
@@ -119,6 +120,64 @@ typedef u32               compat_sigset_word;
 #define COMPAT_OFF_T_MAX	0x7fffffff
 #define COMPAT_LOFF_T_MAX	0x7fffffffffffffff
 
+struct compat_ipc64_perm {
+	compat_key_t key;
+	compat_uid32_t uid;
+	compat_gid32_t gid;
+	compat_uid32_t cuid;
+	compat_gid32_t cgid;
+	unsigned short mode;
+	unsigned short __pad1;
+	unsigned short seq;
+	unsigned short __pad2;
+	compat_ulong_t unused1;
+	compat_ulong_t unused2;
+};
+
+struct compat_semid64_ds {
+	struct compat_ipc64_perm sem_perm;
+	compat_time_t  sem_otime;
+	compat_ulong_t __unused1;
+	compat_time_t  sem_ctime;
+	compat_ulong_t __unused2;
+	compat_ulong_t sem_nsems;
+	compat_ulong_t __unused3;
+	compat_ulong_t __unused4;
+};
+
+struct compat_msqid64_ds {
+	struct compat_ipc64_perm msg_perm;
+	compat_time_t  msg_stime;
+	compat_ulong_t __unused1;
+	compat_time_t  msg_rtime;
+	compat_ulong_t __unused2;
+	compat_time_t  msg_ctime;
+	compat_ulong_t __unused3;
+	compat_ulong_t msg_cbytes;
+	compat_ulong_t msg_qnum;
+	compat_ulong_t msg_qbytes;
+	compat_pid_t   msg_lspid;
+	compat_pid_t   msg_lrpid;
+	compat_ulong_t __unused4;
+	compat_ulong_t __unused5;
+};
+
+struct compat_shmid64_ds {
+	struct compat_ipc64_perm shm_perm;
+	compat_size_t  shm_segsz;
+	compat_time_t  shm_atime;
+	compat_ulong_t __unused1;
+	compat_time_t  shm_dtime;
+	compat_ulong_t __unused2;
+	compat_time_t  shm_ctime;
+	compat_ulong_t __unused3;
+	compat_pid_t   shm_cpid;
+	compat_pid_t   shm_lpid;
+	compat_ulong_t shm_nattch;
+	compat_ulong_t __unused4;
+	compat_ulong_t __unused5;
+};
+
 /*
  * A pointer passed in from user mode. This should not
  * be used for syscall parameters, just declare them

include/linux/compat.h

@@ -10,6 +10,8 @@
 
 #include <linux/stat.h>
 #include <linux/param.h>	/* for HZ */
+#include <linux/sem.h>
+
 #include <asm/compat.h>
 
 #define compat_jiffies_to_clock_t(x)	\
@@ -88,5 +90,15 @@ typedef union compat_sigval {
 	compat_uptr_t	sival_ptr;
 } compat_sigval_t;
 
+long compat_sys_semctl(int first, int second, int third, void __user *uptr);
+long compat_sys_msgsnd(int first, int second, int third, void __user *uptr);
+long compat_sys_msgrcv(int first, int second, int msgtyp, int third,
+		int version, void __user *uptr);
+long compat_sys_msgctl(int first, int second, void __user *uptr);
+long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
+		void __user *uptr);
+long compat_sys_shmctl(int first, int second, void __user *uptr);
+long compat_sys_semtimedop(int semid, struct sembuf __user *tsems,
+		unsigned nsems, const struct compat_timespec __user *timeout);
 #endif /* CONFIG_COMPAT */
 #endif /* _LINUX_COMPAT_H */

ipc/Makefile

@@ -4,4 +4,5 @@
 
 obj-y   := util.o
 
+obj-$(CONFIG_SYSVIPC_COMPAT) += compat.o
 obj-$(CONFIG_SYSVIPC) += msg.o sem.o shm.o