ipc: rename old-style shmctl/semctl/msgctl syscalls
The behavior of these system calls is slightly different between
architectures, as determined by the CONFIG_ARCH_WANT_IPC_PARSE_VERSION
symbol. Most architectures that implement the split IPC syscalls don't set
that symbol and only get the modern version, but alpha, arm, microblaze,
mips-n32, mips-n64 and xtensa expect the caller to pass the IPC_64 flag.
For the architectures that so far only implement sys_ipc(), i.e. m68k,
mips-o32, powerpc, s390, sh, sparc, and x86-32, we want the new behavior
when adding the split syscalls, so we need to distinguish between the
two groups of architectures.
The method I picked for this distinction is to have a separate system call
entry point: sys_old_*ctl() now uses ipc_parse_version, while sys_*ctl()
does not. The system call tables of the five architectures are changed
accordingly.
As an additional benefit, we no longer need the configuration specific
definition for ipc_parse_version(), it always does the same thing now,
but simply won't get called on architectures with the modern interface.
A small downside is that on architectures that do set
ARCH_WANT_IPC_PARSE_VERSION, we now have an extra set of entry points
that are never called. They only add a few bytes of bloat, so it seems
better to keep them compared to adding yet another Kconfig symbol.
I considered adding new syscall numbers for the IPC_64 variants for
consistency, but decided against that for now.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/ipc/msg.c b/ipc/msg.c
index 0833c64..8dec945 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -567,9 +567,8 @@
return err;
}
-long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf)
+static long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf, int version)
{
- int version;
struct ipc_namespace *ns;
struct msqid64_ds msqid64;
int err;
@@ -577,7 +576,6 @@
if (msqid < 0 || cmd < 0)
return -EINVAL;
- version = ipc_parse_version(&cmd);
ns = current->nsproxy->ipc_ns;
switch (cmd) {
@@ -613,9 +611,23 @@
SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
{
- return ksys_msgctl(msqid, cmd, buf);
+ return ksys_msgctl(msqid, cmd, buf, IPC_64);
}
+#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
+long ksys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf)
+{
+ int version = ipc_parse_version(&cmd);
+
+ return ksys_msgctl(msqid, cmd, buf, version);
+}
+
+SYSCALL_DEFINE3(old_msgctl, int, msqid, int, cmd, struct msqid_ds __user *, buf)
+{
+ return ksys_old_msgctl(msqid, cmd, buf);
+}
+#endif
+
#ifdef CONFIG_COMPAT
struct compat_msqid_ds {
@@ -689,12 +701,11 @@
}
}
-long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr)
+static long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr, int version)
{
struct ipc_namespace *ns;
int err;
struct msqid64_ds msqid64;
- int version = compat_ipc_parse_version(&cmd);
ns = current->nsproxy->ipc_ns;
@@ -734,8 +745,22 @@
COMPAT_SYSCALL_DEFINE3(msgctl, int, msqid, int, cmd, void __user *, uptr)
{
- return compat_ksys_msgctl(msqid, cmd, uptr);
+ return compat_ksys_msgctl(msqid, cmd, uptr, IPC_64);
}
+
+#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr)
+{
+ int version = compat_ipc_parse_version(&cmd);
+
+ return compat_ksys_msgctl(msqid, cmd, uptr, version);
+}
+
+COMPAT_SYSCALL_DEFINE3(old_msgctl, int, msqid, int, cmd, void __user *, uptr)
+{
+ return compat_ksys_old_msgctl(msqid, cmd, uptr);
+}
+#endif
#endif
static int testmsg(struct msg_msg *msg, long type, int mode)
diff --git a/ipc/sem.c b/ipc/sem.c
index 745dc61..d1efff3 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1634,9 +1634,8 @@
return err;
}
-long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg)
+static long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg, int version)
{
- int version;
struct ipc_namespace *ns;
void __user *p = (void __user *)arg;
struct semid64_ds semid64;
@@ -1645,7 +1644,6 @@
if (semid < 0)
return -EINVAL;
- version = ipc_parse_version(&cmd);
ns = current->nsproxy->ipc_ns;
switch (cmd) {
@@ -1691,9 +1689,23 @@
SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
{
- return ksys_semctl(semid, semnum, cmd, arg);
+ return ksys_semctl(semid, semnum, cmd, arg, IPC_64);
}
+#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
+long ksys_old_semctl(int semid, int semnum, int cmd, unsigned long arg)
+{
+ int version = ipc_parse_version(&cmd);
+
+ return ksys_semctl(semid, semnum, cmd, arg, version);
+}
+
+SYSCALL_DEFINE4(old_semctl, int, semid, int, semnum, int, cmd, unsigned long, arg)
+{
+ return ksys_old_semctl(semid, semnum, cmd, arg);
+}
+#endif
+
#ifdef CONFIG_COMPAT
struct compat_semid_ds {
@@ -1744,12 +1756,11 @@
}
}
-long compat_ksys_semctl(int semid, int semnum, int cmd, int arg)
+static long compat_ksys_semctl(int semid, int semnum, int cmd, int arg, int version)
{
void __user *p = compat_ptr(arg);
struct ipc_namespace *ns;
struct semid64_ds semid64;
- int version = compat_ipc_parse_version(&cmd);
int err;
ns = current->nsproxy->ipc_ns;
@@ -1792,8 +1803,22 @@
COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
{
- return compat_ksys_semctl(semid, semnum, cmd, arg);
+ return compat_ksys_semctl(semid, semnum, cmd, arg, IPC_64);
}
+
+#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg)
+{
+ int version = compat_ipc_parse_version(&cmd);
+
+ return compat_ksys_semctl(semid, semnum, cmd, arg, version);
+}
+
+COMPAT_SYSCALL_DEFINE4(old_semctl, int, semid, int, semnum, int, cmd, int, arg)
+{
+ return compat_ksys_old_semctl(semid, semnum, cmd, arg);
+}
+#endif
#endif
/* If the task doesn't already have a undo_list, then allocate one
diff --git a/ipc/shm.c b/ipc/shm.c
index 0842411..ce1ca9f 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1137,16 +1137,15 @@
return err;
}
-long ksys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
+static long ksys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf, int version)
{
- int err, version;
+ int err;
struct ipc_namespace *ns;
struct shmid64_ds sem64;
if (cmd < 0 || shmid < 0)
return -EINVAL;
- version = ipc_parse_version(&cmd);
ns = current->nsproxy->ipc_ns;
switch (cmd) {
@@ -1194,9 +1193,23 @@
SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
{
- return ksys_shmctl(shmid, cmd, buf);
+ return ksys_shmctl(shmid, cmd, buf, IPC_64);
}
+#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
+long ksys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
+{
+ int version = ipc_parse_version(&cmd);
+
+ return ksys_shmctl(shmid, cmd, buf, version);
+}
+
+SYSCALL_DEFINE3(old_shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf)
+{
+ return ksys_old_shmctl(shmid, cmd, buf);
+}
+#endif
+
#ifdef CONFIG_COMPAT
struct compat_shmid_ds {
@@ -1319,11 +1332,10 @@
}
}
-long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr)
+long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr, int version)
{
struct ipc_namespace *ns;
struct shmid64_ds sem64;
- int version = compat_ipc_parse_version(&cmd);
int err;
ns = current->nsproxy->ipc_ns;
@@ -1378,8 +1390,22 @@
COMPAT_SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, void __user *, uptr)
{
- return compat_ksys_shmctl(shmid, cmd, uptr);
+ return compat_ksys_shmctl(shmid, cmd, uptr, IPC_64);
}
+
+#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
+long compat_ksys_old_shmctl(int shmid, int cmd, void __user *uptr)
+{
+ int version = compat_ipc_parse_version(&cmd);
+
+ return compat_ksys_shmctl(shmid, cmd, uptr, version);
+}
+
+COMPAT_SYSCALL_DEFINE3(old_shmctl, int, shmid, int, cmd, void __user *, uptr)
+{
+ return compat_ksys_old_shmctl(shmid, cmd, uptr);
+}
+#endif
#endif
/*
diff --git a/ipc/syscall.c b/ipc/syscall.c
index 3cf8ad7..581bdff 100644
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -47,7 +47,7 @@
return -EINVAL;
if (get_user(arg, (unsigned long __user *) ptr))
return -EFAULT;
- return ksys_semctl(first, second, third, arg);
+ return ksys_old_semctl(first, second, third, arg);
}
case MSGSND:
@@ -75,7 +75,7 @@
case MSGGET:
return ksys_msgget((key_t) first, second);
case MSGCTL:
- return ksys_msgctl(first, second,
+ return ksys_old_msgctl(first, second,
(struct msqid_ds __user *)ptr);
case SHMAT:
@@ -100,7 +100,7 @@
case SHMGET:
return ksys_shmget(first, second, third);
case SHMCTL:
- return ksys_shmctl(first, second,
+ return ksys_old_shmctl(first, second,
(struct shmid_ds __user *) ptr);
default:
return -ENOSYS;
@@ -152,7 +152,7 @@
return -EINVAL;
if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
return -EFAULT;
- return compat_ksys_semctl(first, second, third, pad);
+ return compat_ksys_old_semctl(first, second, third, pad);
case MSGSND:
return compat_ksys_msgsnd(first, ptr, second, third);
@@ -177,7 +177,7 @@
case MSGGET:
return ksys_msgget(first, second);
case MSGCTL:
- return compat_ksys_msgctl(first, second, compat_ptr(ptr));
+ return compat_ksys_old_msgctl(first, second, compat_ptr(ptr));
case SHMAT: {
int err;
@@ -196,7 +196,7 @@
case SHMGET:
return ksys_shmget(first, (unsigned int)second, third);
case SHMCTL:
- return compat_ksys_shmctl(first, second, compat_ptr(ptr));
+ return compat_ksys_old_shmctl(first, second, compat_ptr(ptr));
}
return -ENOSYS;
diff --git a/ipc/util.h b/ipc/util.h
index d768fdb..e272be6 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -160,10 +160,7 @@
}
}
-#ifndef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
-/* On IA-64, we always use the "64-bit version" of the IPC structures. */
-# define ipc_parse_version(cmd) IPC_64
-#else
+#ifdef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
int ipc_parse_version(int *cmd);
#endif
@@ -246,13 +243,9 @@
static inline int compat_ipc_parse_version(int *cmd)
{
-#ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
int version = *cmd & IPC_64;
*cmd &= ~IPC_64;
return version;
-#else
- return IPC_64;
-#endif
}
#endif
@@ -261,29 +254,29 @@
unsigned int nsops,
const struct __kernel_timespec __user *timeout);
long ksys_semget(key_t key, int nsems, int semflg);
-long ksys_semctl(int semid, int semnum, int cmd, unsigned long arg);
+long ksys_old_semctl(int semid, int semnum, int cmd, unsigned long arg);
long ksys_msgget(key_t key, int msgflg);
-long ksys_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
+long ksys_old_msgctl(int msqid, int cmd, struct msqid_ds __user *buf);
long ksys_msgrcv(int msqid, struct msgbuf __user *msgp, size_t msgsz,
long msgtyp, int msgflg);
long ksys_msgsnd(int msqid, struct msgbuf __user *msgp, size_t msgsz,
int msgflg);
long ksys_shmget(key_t key, size_t size, int shmflg);
long ksys_shmdt(char __user *shmaddr);
-long ksys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
+long ksys_old_shmctl(int shmid, int cmd, struct shmid_ds __user *buf);
/* for CONFIG_ARCH_WANT_OLD_COMPAT_IPC */
long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems,
unsigned int nsops,
const struct old_timespec32 __user *timeout);
#ifdef CONFIG_COMPAT
-long compat_ksys_semctl(int semid, int semnum, int cmd, int arg);
-long compat_ksys_msgctl(int msqid, int cmd, void __user *uptr);
+long compat_ksys_old_semctl(int semid, int semnum, int cmd, int arg);
+long compat_ksys_old_msgctl(int msqid, int cmd, void __user *uptr);
long compat_ksys_msgrcv(int msqid, compat_uptr_t msgp, compat_ssize_t msgsz,
compat_long_t msgtyp, int msgflg);
long compat_ksys_msgsnd(int msqid, compat_uptr_t msgp,
compat_ssize_t msgsz, int msgflg);
-long compat_ksys_shmctl(int shmid, int cmd, void __user *uptr);
+long compat_ksys_old_shmctl(int shmid, int cmd, void __user *uptr);
#endif /* CONFIG_COMPAT */
#endif