diff options
Diffstat (limited to 'drivers/misc/lkdtm/heap.c')
| -rw-r--r-- | drivers/misc/lkdtm/heap.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/misc/lkdtm/heap.c b/drivers/misc/lkdtm/heap.c index 3d9aae5821a0..8a92f5a800fa 100644 --- a/drivers/misc/lkdtm/heap.c +++ b/drivers/misc/lkdtm/heap.c @@ -13,6 +13,13 @@ static struct kmem_cache *a_cache; static struct kmem_cache *b_cache; /* + * Using volatile here means the compiler cannot ever make assumptions + * about this value. This means compile-time length checks involving + * this variable cannot be performed; only run-time checks. + */ +static volatile int __offset = 1; + +/* * If there aren't guard pages, it's likely that a consecutive allocation will * let us overflow into the second allocation without overwriting something real. */ @@ -24,7 +31,7 @@ void lkdtm_VMALLOC_LINEAR_OVERFLOW(void) two = vzalloc(PAGE_SIZE); pr_info("Attempting vmalloc linear overflow ...\n"); - memset(one, 0xAA, PAGE_SIZE + 1); + memset(one, 0xAA, PAGE_SIZE + __offset); vfree(two); vfree(one); |