commit 0f672f6c0b52b7b0700b0915c72b540721af4465
author David Brazdil <dbrazdil@google.com> Tue Dec 10 10:32:29 2019 +0000
committer David Brazdil <dbrazdil@google.com> Tue Dec 10 19:03:18 2019 +0000
tree 85c8cba019caa205e4f8920d72d93f6d6deaf29c
parent 3a0ad55d848b50499b68d7141d4eca997fce28ef

Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd

drivers/misc/lkdtm/perms.c

diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c
index 53b85c9..62f76d5 100644
--- a/drivers/misc/lkdtm/perms.c
+++ b/drivers/misc/lkdtm/perms.c
@@ -47,7 +47,7 @@
 {
 	void (*func)(void) = dst;
 
-	pr_info("attempting ok execution at %p\n", do_nothing);
+	pr_info("attempting ok execution at %px\n", do_nothing);
 	do_nothing();
 
 	if (write == CODE_WRITE) {
@@ -55,7 +55,7 @@
 		flush_icache_range((unsigned long)dst,
 				   (unsigned long)dst + EXEC_SIZE);
 	}
-	pr_info("attempting bad execution at %p\n", func);
+	pr_info("attempting bad execution at %px\n", func);
 	func();
 }
 
@@ -66,14 +66,14 @@
 	/* Intentionally crossing kernel/user memory boundary. */
 	void (*func)(void) = dst;
 
-	pr_info("attempting ok execution at %p\n", do_nothing);
+	pr_info("attempting ok execution at %px\n", do_nothing);
 	do_nothing();
 
 	copied = access_process_vm(current, (unsigned long)dst, do_nothing,
 				   EXEC_SIZE, FOLL_WRITE);
 	if (copied < EXEC_SIZE)
 		return;
-	pr_info("attempting bad execution at %p\n", func);
+	pr_info("attempting bad execution at %px\n", func);
 	func();
 }
 
@@ -82,7 +82,7 @@
 	/* Explicitly cast away "const" for the test. */
 	unsigned long *ptr = (unsigned long *)&rodata;
 
-	pr_info("attempting bad rodata write at %p\n", ptr);
+	pr_info("attempting bad rodata write at %px\n", ptr);
 	*ptr ^= 0xabcd1234;
 }
 
@@ -100,7 +100,7 @@
 		return;
 	}
 
-	pr_info("attempting bad ro_after_init write at %p\n", ptr);
+	pr_info("attempting bad ro_after_init write at %px\n", ptr);
 	*ptr ^= 0xabcd1234;
 }
 
@@ -112,7 +112,7 @@
 	size = (unsigned long)do_overwritten - (unsigned long)do_nothing;
 	ptr = (unsigned char *)do_overwritten;
 
-	pr_info("attempting bad %zu byte write at %p\n", size, ptr);
+	pr_info("attempting bad %zu byte write at %px\n", size, ptr);
 	memcpy(ptr, (unsigned char *)do_nothing, size);
 	flush_icache_range((unsigned long)ptr, (unsigned long)(ptr + size));
 
@@ -164,6 +164,11 @@
 	vm_munmap(user_addr, PAGE_SIZE);
 }
 
+void lkdtm_EXEC_NULL(void)
+{
+	execute_location(NULL, CODE_AS_IS);
+}
+
 void lkdtm_ACCESS_USERSPACE(void)
 {
 	unsigned long user_addr, tmp = 0;
@@ -185,16 +190,29 @@
 
 	ptr = (unsigned long *)user_addr;
 
-	pr_info("attempting bad read at %p\n", ptr);
+	pr_info("attempting bad read at %px\n", ptr);
 	tmp = *ptr;
 	tmp += 0xc0dec0de;
 
-	pr_info("attempting bad write at %p\n", ptr);
+	pr_info("attempting bad write at %px\n", ptr);
 	*ptr = tmp;
 
 	vm_munmap(user_addr, PAGE_SIZE);
 }
 
+void lkdtm_ACCESS_NULL(void)
+{
+	unsigned long tmp;
+	unsigned long *ptr = (unsigned long *)NULL;
+
+	pr_info("attempting bad read at %px\n", ptr);
+	tmp = *ptr;
+	tmp += 0xc0dec0de;
+
+	pr_info("attempting bad write at %px\n", ptr);
+	*ptr = tmp;
+}
+
 void __init lkdtm_perms_init(void)
 {
 	/* Make sure we can write to __ro_after_init values during __init */