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-rw-r--r--lib/test_kasan.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 82169fbf2453..5e51872b3fc1 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -12,9 +12,12 @@
#define pr_fmt(fmt) "kasan test: %s " fmt, __func__
#include <linux/kernel.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/uaccess.h>
#include <linux/module.h>
static noinline void __init kmalloc_oob_right(void)
@@ -344,6 +347,70 @@ static noinline void __init kasan_stack_oob(void)
*(volatile char *)p;
}
+static noinline void __init ksize_unpoisons_memory(void)
+{
+ char *ptr;
+ size_t size = 123, real_size = size;
+
+ pr_info("ksize() unpoisons the whole allocated chunk\n");
+ ptr = kmalloc(size, GFP_KERNEL);
+ if (!ptr) {
+ pr_err("Allocation failed\n");
+ return;
+ }
+ real_size = ksize(ptr);
+ /* This access doesn't trigger an error. */
+ ptr[size] = 'x';
+ /* This one does. */
+ ptr[real_size] = 'y';
+ kfree(ptr);
+}
+
+static noinline void __init copy_user_test(void)
+{
+ char *kmem;
+ char __user *usermem;
+ size_t size = 10;
+ int unused;
+
+ kmem = kmalloc(size, GFP_KERNEL);
+ if (!kmem)
+ return;
+
+ usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
+ PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_ANONYMOUS | MAP_PRIVATE, 0);
+ if (IS_ERR(usermem)) {
+ pr_err("Failed to allocate user memory\n");
+ kfree(kmem);
+ return;
+ }
+
+ pr_info("out-of-bounds in copy_from_user()\n");
+ unused = copy_from_user(kmem, usermem, size + 1);
+
+ pr_info("out-of-bounds in copy_to_user()\n");
+ unused = copy_to_user(usermem, kmem, size + 1);
+
+ pr_info("out-of-bounds in __copy_from_user()\n");
+ unused = __copy_from_user(kmem, usermem, size + 1);
+
+ pr_info("out-of-bounds in __copy_to_user()\n");
+ unused = __copy_to_user(usermem, kmem, size + 1);
+
+ pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
+ unused = __copy_from_user_inatomic(kmem, usermem, size + 1);
+
+ pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
+ unused = __copy_to_user_inatomic(usermem, kmem, size + 1);
+
+ pr_info("out-of-bounds in strncpy_from_user()\n");
+ unused = strncpy_from_user(kmem, usermem, size + 1);
+
+ vm_munmap((unsigned long)usermem, PAGE_SIZE);
+ kfree(kmem);
+}
+
static int __init kmalloc_tests_init(void)
{
kmalloc_oob_right();
@@ -367,6 +434,8 @@ static int __init kmalloc_tests_init(void)
kmem_cache_oob();
kasan_stack_oob();
kasan_global_oob();
+ ksize_unpoisons_memory();
+ copy_user_test();
return -EAGAIN;
}