The patch titled
Subject: kasan/tests: add tests for user memory access functions
has been added to the -mm tree. Its filename is
kasan-tests-add-tests-for-user-memory-access-functions.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kasan-tests-add-tests-for-user-memory-access-functions.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kasan-tests-add-tests-for-user-memory-access-functions.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Subject: kasan/tests: add tests for user memory access functions
Add some tests for the newly-added user memory access API.
Link: http://lkml.kernel.org/r/1462538722-1574-1-git-send-email-aryabinin@xxxxxxxxxxxxx
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/test_kasan.c | 49 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff -puN lib/test_kasan.c~kasan-tests-add-tests-for-user-memory-access-functions lib/test_kasan.c
--- a/lib/test_kasan.c~kasan-tests-add-tests-for-user-memory-access-functions
+++ a/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)
@@ -389,6 +392,51 @@ static noinline void __init ksize_unpois
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();
@@ -416,6 +464,7 @@ static int __init kmalloc_tests_init(voi
kasan_quarantine_cache();
#endif
ksize_unpoisons_memory();
+ copy_user_test();
return -EAGAIN;
}
_
Patches currently in -mm which might be from aryabinin@xxxxxxxxxxxxx are
mm-kasan-print-name-of-mem-caller-in-report.patch
mm-kasan-add-api-to-check-memory-regions.patch
x86-kasan-instrument-user-memory-access-api.patch
kasan-tests-add-tests-for-user-memory-access-functions.patch
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