1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index e910b3c5331c..d6ee1aae3e72 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -329,7 +329,12 @@ static void execute_location(void *dst)
 {
         void (*func)(void) = dst;
 
+        pr_info("attempting ok execution at %p\n", do_nothing);
+        do_nothing();
+
         memcpy(dst, do_nothing, EXEC_SIZE);
+        flush_icache_range((unsigned long)dst, (unsigned long)dst + EXEC_SIZE);
+        pr_info("attempting bad execution at %p\n", func);
         func();
 }
 
@@ -338,8 +343,13 @@ static void execute_user_location(void *dst)
         /* Intentionally crossing kernel/user memory boundary. */
         void (*func)(void) = dst;
 
+        pr_info("attempting ok execution at %p\n", do_nothing);
+        do_nothing();
+
         if (copy_to_user((void __user *)dst, do_nothing, EXEC_SIZE))
                 return;
+        flush_icache_range((unsigned long)dst, (unsigned long)dst + EXEC_SIZE);
+        pr_info("attempting bad execution at %p\n", func);
         func();
 }
 
@@ -464,8 +474,12 @@ static void lkdtm_do_action(enum ctype which)
                 }
 
                 ptr = (unsigned long *)user_addr;
+
+                pr_info("attempting bad read at %p\n", ptr);
                 tmp = *ptr;
                 tmp += 0xc0dec0de;
+
+                pr_info("attempting bad write at %p\n", ptr);
                 *ptr = tmp;
 
                 vm_munmap(user_addr, PAGE_SIZE);
@@ -476,6 +490,8 @@ static void lkdtm_do_action(enum ctype which)
                 unsigned long *ptr;
 
                 ptr = (unsigned long *)&rodata;
+
+                pr_info("attempting bad write at %p\n", ptr);
                 *ptr ^= 0xabcd1234;
 
                 break;