X-Git-Url: http://git.cascardo.info/?a=blobdiff_plain;f=lib%2Ftest_kasan.c;h=5e51872b3fc163af2fe82e6d7010b4aba08b612a;hb=58e4411b2d05bea9992fd8ee510f696b73d314c1;hp=82169fbf24538fdc70ff98fce1f324cb13f241da;hpb=8c57a5e7b2820f349c95b8c8393fec1e0f4070d2;p=cascardo%2Flinux.git

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;
 }