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kasan/tests: add tests for user memory access functions

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Add some tests for the newly-added user memory access API.

Link: http://lkml.kernel.org/r/1462538722-1574-1-git-send-email-aryabinin@virtuozzo.com
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Ryabinin 2016-05-20 16:59:34 -07:00 committed by Linus Torvalds
parent 1771c6e1a5
commit eae08dcab8
1 changed files with 49 additions and 0 deletions
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49
lib/test_kasan.c
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@ -12,9 +12,12 @@
#define pr_fmt(fmt) "kasan test: %s " fmt, __func__ #define pr_fmt(fmt) "kasan test: %s " fmt, __func__
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/printk.h> #include <linux/printk.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/module.h> #include <linux/module.h>
static noinline void __init kmalloc_oob_right(void) static noinline void __init kmalloc_oob_right(void)
@ -363,6 +366,51 @@ static noinline void __init ksize_unpoisons_memory(void)
kfree(ptr); 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) static int __init kmalloc_tests_init(void)
{ {
kmalloc_oob_right(); kmalloc_oob_right();
@ -387,6 +435,7 @@ static int __init kmalloc_tests_init(void)
kasan_stack_oob(); kasan_stack_oob();
kasan_global_oob(); kasan_global_oob();
ksize_unpoisons_memory(); ksize_unpoisons_memory();
copy_user_test();
return -EAGAIN; return -EAGAIN;
} }