v4.19.13 snapshot.
diff --git a/ipc/syscall.c b/ipc/syscall.c
new file mode 100644
index 0000000..65d405f
--- /dev/null
+++ b/ipc/syscall.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
+ *
+ * This is really horribly ugly, and new architectures should just wire up
+ * the individual syscalls instead.
+ */
+#include <linux/unistd.h>
+#include <linux/syscalls.h>
+#include <linux/security.h>
+#include <linux/ipc_namespace.h>
+#include "util.h"
+
+#ifdef __ARCH_WANT_SYS_IPC
+#include <linux/errno.h>
+#include <linux/ipc.h>
+#include <linux/shm.h>
+#include <linux/uaccess.h>
+
+SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
+ unsigned long, third, void __user *, ptr, long, fifth)
+{
+ int version, ret;
+
+ version = call >> 16; /* hack for backward compatibility */
+ call &= 0xffff;
+
+ switch (call) {
+ case SEMOP:
+ return ksys_semtimedop(first, (struct sembuf __user *)ptr,
+ second, NULL);
+ case SEMTIMEDOP:
+ if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME))
+ return ksys_semtimedop(first, ptr, second,
+ (const struct __kernel_timespec __user *)fifth);
+ else if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
+ return compat_ksys_semtimedop(first, ptr, second,
+ (const struct compat_timespec __user *)fifth);
+ else
+ return -ENOSYS;
+
+ case SEMGET:
+ return ksys_semget(first, second, third);
+ case SEMCTL: {
+ unsigned long arg;
+ if (!ptr)
+ return -EINVAL;
+ if (get_user(arg, (unsigned long __user *) ptr))
+ return -EFAULT;
+ return ksys_semctl(first, second, third, arg);
+ }
+
+ case MSGSND:
+ return ksys_msgsnd(first, (struct msgbuf __user *) ptr,
+ second, third);
+ case MSGRCV:
+ switch (version) {
+ case 0: {
+ struct ipc_kludge tmp;
+ if (!ptr)
+ return -EINVAL;
+
+ if (copy_from_user(&tmp,
+ (struct ipc_kludge __user *) ptr,
+ sizeof(tmp)))
+ return -EFAULT;
+ return ksys_msgrcv(first, tmp.msgp, second,
+ tmp.msgtyp, third);
+ }
+ default:
+ return ksys_msgrcv(first,
+ (struct msgbuf __user *) ptr,
+ second, fifth, third);
+ }
+ case MSGGET:
+ return ksys_msgget((key_t) first, second);
+ case MSGCTL:
+ return ksys_msgctl(first, second,
+ (struct msqid_ds __user *)ptr);
+
+ case SHMAT:
+ switch (version) {
+ default: {
+ unsigned long raddr;
+ ret = do_shmat(first, (char __user *)ptr,
+ second, &raddr, SHMLBA);
+ if (ret)
+ return ret;
+ return put_user(raddr, (unsigned long __user *) third);
+ }
+ case 1:
+ /*
+ * This was the entry point for kernel-originating calls
+ * from iBCS2 in 2.2 days.
+ */
+ return -EINVAL;
+ }
+ case SHMDT:
+ return ksys_shmdt((char __user *)ptr);
+ case SHMGET:
+ return ksys_shmget(first, second, third);
+ case SHMCTL:
+ return ksys_shmctl(first, second,
+ (struct shmid_ds __user *) ptr);
+ default:
+ return -ENOSYS;
+ }
+}
+#endif
+
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+
+#ifndef COMPAT_SHMLBA
+#define COMPAT_SHMLBA SHMLBA
+#endif
+
+struct compat_ipc_kludge {
+ compat_uptr_t msgp;
+ compat_long_t msgtyp;
+};
+
+#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
+COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
+ u32, third, compat_uptr_t, ptr, u32, fifth)
+{
+ int version;
+ u32 pad;
+
+ version = call >> 16; /* hack for backward compatibility */
+ call &= 0xffff;
+
+ switch (call) {
+ case SEMOP:
+ /* struct sembuf is the same on 32 and 64bit :)) */
+ return ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
+ case SEMTIMEDOP:
+ if (!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
+ return -ENOSYS;
+ return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
+ compat_ptr(fifth));
+ case SEMGET:
+ return ksys_semget(first, second, third);
+ case SEMCTL:
+ if (!ptr)
+ return -EINVAL;
+ if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
+ return -EFAULT;
+ return compat_ksys_semctl(first, second, third, pad);
+
+ case MSGSND:
+ return compat_ksys_msgsnd(first, ptr, second, third);
+
+ case MSGRCV: {
+ void __user *uptr = compat_ptr(ptr);
+
+ if (first < 0 || second < 0)
+ return -EINVAL;
+
+ if (!version) {
+ struct compat_ipc_kludge ipck;
+ if (!uptr)
+ return -EINVAL;
+ if (copy_from_user(&ipck, uptr, sizeof(ipck)))
+ return -EFAULT;
+ return compat_ksys_msgrcv(first, ipck.msgp, second,
+ ipck.msgtyp, third);
+ }
+ return compat_ksys_msgrcv(first, ptr, second, fifth, third);
+ }
+ case MSGGET:
+ return ksys_msgget(first, second);
+ case MSGCTL:
+ return compat_ksys_msgctl(first, second, compat_ptr(ptr));
+
+ case SHMAT: {
+ int err;
+ unsigned long raddr;
+
+ if (version == 1)
+ return -EINVAL;
+ err = do_shmat(first, compat_ptr(ptr), second, &raddr,
+ COMPAT_SHMLBA);
+ if (err < 0)
+ return err;
+ return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
+ }
+ case SHMDT:
+ return ksys_shmdt(compat_ptr(ptr));
+ case SHMGET:
+ return ksys_shmget(first, (unsigned int)second, third);
+ case SHMCTL:
+ return compat_ksys_shmctl(first, second, compat_ptr(ptr));
+ }
+
+ return -ENOSYS;
+}
+#endif
+#endif