1 files changed, 41 insertions, 0 deletions

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index b63b367a94e8..49cc4d570a40 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -18,6 +18,9 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/uaccess.h>
+#include <linux/io.h>
+
+#include <asm/page.h>
 
 /*
  * Note: test functions are marked noinline so that their names appear in
@@ -337,6 +340,42 @@ static noinline void __init kmalloc_uaf2(void)
         kfree(ptr2);
 }
 
+static noinline void __init kfree_via_page(void)
+{
+        char *ptr;
+        size_t size = 8;
+        struct page *page;
+        unsigned long offset;
+
+        pr_info("invalid-free false positive (via page)\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        page = virt_to_page(ptr);
+        offset = offset_in_page(ptr);
+        kfree(page_address(page) + offset);
+}
+
+static noinline void __init kfree_via_phys(void)
+{
+        char *ptr;
+        size_t size = 8;
+        phys_addr_t phys;
+
+        pr_info("invalid-free false positive (via phys)\n");
+        ptr = kmalloc(size, GFP_KERNEL);
+        if (!ptr) {
+                pr_err("Allocation failed\n");
+                return;
+        }
+
+        phys = virt_to_phys(ptr);
+        kfree(phys_to_virt(phys));
+}
+
 static noinline void __init kmem_cache_oob(void)
 {
         char *p;
@@ -737,6 +776,8 @@ static int __init kmalloc_tests_init(void)
         kmalloc_uaf();
         kmalloc_uaf_memset();
         kmalloc_uaf2();
+        kfree_via_page();
+        kfree_via_phys();
         kmem_cache_oob();
         memcg_accounted_kmem_cache();
         kasan_stack_oob();