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kasan: add test for vmalloc

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Test kasan vmalloc support by adding a new test to the module.

Link: http://lkml.kernel.org/r/20191031093909.9228-3-dja@axtens.net
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Axtens 2019-11-30 17:54:53 -08:00 committed by Linus Torvalds
parent 3c5c3cfb9e
commit 0651391693
1 changed files with 26 additions and 0 deletions
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26
lib/test_kasan.c
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@ -19,6 +19,7 @@
#include <linux/string.h> #include <linux/string.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/vmalloc.h>
#include <asm/page.h> #include <asm/page.h>
@ -748,6 +749,30 @@ static noinline void __init kmalloc_double_kzfree(void)
kzfree(ptr); kzfree(ptr);
} }
#ifdef CONFIG_KASAN_VMALLOC
static noinline void __init vmalloc_oob(void)
{
void *area;
pr_info("vmalloc out-of-bounds\n");
/*
* We have to be careful not to hit the guard page.
* The MMU will catch that and crash us.
*/
area = vmalloc(3000);
if (!area) {
pr_err("Allocation failed\n");
return;
}
((volatile char *)area)[3100];
vfree(area);
}
#else
static void __init vmalloc_oob(void) {}
#endif
static int __init kmalloc_tests_init(void) static int __init kmalloc_tests_init(void)
{ {
/* /*
@ -793,6 +818,7 @@ static int __init kmalloc_tests_init(void)
kasan_strings(); kasan_strings();
kasan_bitops(); kasan_bitops();
kmalloc_double_kzfree(); kmalloc_double_kzfree();
vmalloc_oob();
kasan_restore_multi_shot(multishot); kasan_restore_multi_shot(multishot);