3 files changed, 23 insertions, 8 deletions

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index b4e994cd3a42..6cb9fc7e9382 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -134,6 +134,7 @@ vdso_install:
 archclean:
         $(Q)$(MAKE) $(clean)=$(boot)
 
+ifeq ($(KBUILD_EXTMOD),)
 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 # In order to do that, we should use the archprepare target, but we can't since
 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
@@ -143,6 +144,7 @@ archclean:
 prepare: vdso_prepare
 vdso_prepare: prepare0
         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
+endif
 
 define archhelp
   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
diff --git a/arch/arm64/kernel/crash_dump.c b/arch/arm64/kernel/crash_dump.c
index f46d57c31443..6b5037ed15b2 100644
--- a/arch/arm64/kernel/crash_dump.c
+++ b/arch/arm64/kernel/crash_dump.c
@@ -58,7 +58,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
 /**
  * elfcorehdr_read - read from ELF core header
  * @buf: buffer where the data is placed
- * @csize: number of bytes to read
+ * @count: number of bytes to read
  * @ppos: address in the memory
  *
  * This function reads @count bytes from elf core header which exists
diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
index 9b65132e789a..2a5b338b2542 100644
--- a/arch/arm64/kernel/probes/kprobes.c
+++ b/arch/arm64/kernel/probes/kprobes.c
@@ -23,7 +23,9 @@
 #include <linux/slab.h>
 #include <linux/stop_machine.h>
 #include <linux/sched/debug.h>
+#include <linux/set_memory.h>
 #include <linux/stringify.h>
+#include <linux/vmalloc.h>
 #include <asm/traps.h>
 #include <asm/ptrace.h>
 #include <asm/cacheflush.h>
@@ -42,10 +44,21 @@ DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
 static void __kprobes
 post_kprobe_handler(struct kprobe_ctlblk *, struct pt_regs *);
 
+static int __kprobes patch_text(kprobe_opcode_t *addr, u32 opcode)
+{
+        void *addrs[1];
+        u32 insns[1];
+
+        addrs[0] = addr;
+        insns[0] = opcode;
+
+        return aarch64_insn_patch_text(addrs, insns, 1);
+}
+
 static void __kprobes arch_prepare_ss_slot(struct kprobe *p)
 {
         /* prepare insn slot */
-        p->ainsn.api.insn[0] = cpu_to_le32(p->opcode);
+        patch_text(p->ainsn.api.insn, p->opcode);
 
         flush_icache_range((uintptr_t) (p->ainsn.api.insn),
                            (uintptr_t) (p->ainsn.api.insn) +
@@ -118,15 +131,15 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
         return 0;
 }
 
-static int __kprobes patch_text(kprobe_opcode_t *addr, u32 opcode)
+void *alloc_insn_page(void)
 {
-        void *addrs[1];
-        u32 insns[1];
+        void *page;
 
-        addrs[0] = (void *)addr;
-        insns[0] = (u32)opcode;
+        page = vmalloc_exec(PAGE_SIZE);
+        if (page)
+                set_memory_ro((unsigned long)page, 1);
 
-        return aarch64_insn_patch_text(addrs, insns, 1);
+        return page;
 }
 
 /* arm kprobe: install breakpoint in text */