2 files changed, 9 insertions, 1 deletions

diff --git a/arch/um/kernel/ptrace.c b/arch/um/kernel/ptrace.c
index 15e8b7c4de13..8e3d69e4fcb5 100644
--- a/arch/um/kernel/ptrace.c
+++ b/arch/um/kernel/ptrace.c
@@ -64,6 +64,11 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                 ret = poke_user(child, addr, data);
                 break;
 
+        case PTRACE_SYSEMU:
+        case PTRACE_SYSEMU_SINGLESTEP:
+                ret = -EIO;
+                break;
+
         /* continue and stop at next (return from) syscall */
         case PTRACE_SYSCALL:
         /* restart after signal. */
diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c
index 74f49bb9b125..89b48a116a89 100644
--- a/arch/um/os-Linux/user_syms.c
+++ b/arch/um/os-Linux/user_syms.c
@@ -14,7 +14,6 @@
 #undef memset
 
 extern size_t strlen(const char *);
-extern void *memcpy(void *, const void *, size_t);
 extern void *memmove(void *, const void *, size_t);
 extern void *memset(void *, int, size_t);
 extern int printf(const char *, ...);
@@ -24,7 +23,11 @@ extern int printf(const char *, ...);
 EXPORT_SYMBOL(strstr);
 #endif
 
+#ifndef __x86_64__
+extern void *memcpy(void *, const void *, size_t);
 EXPORT_SYMBOL(memcpy);
+#endif
+
 EXPORT_SYMBOL(memmove);
 EXPORT_SYMBOL(memset);
 EXPORT_SYMBOL(printf);