tests: make tail_alloc create additional memory mapping holes
* tests/tail_alloc.c (tail_alloc): Create additional memory mapping
holes before and after the allocated memory.
diff --git a/tests/tail_alloc.c b/tests/tail_alloc.c
index 82e1aac..08081d4 100644
--- a/tests/tail_alloc.c
+++ b/tests/tail_alloc.c
@@ -34,17 +34,20 @@
{
const size_t page_size = get_page_size();
const size_t len = (size + page_size - 1) & -page_size;
- const size_t alloc_size = len + 2 * page_size;
+ const size_t alloc_size = len + 6 * page_size;
void *p = mmap(NULL, alloc_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (MAP_FAILED == p)
perror_msg_and_fail("mmap(%zu)", alloc_size);
- void *start_work = p + page_size;
+ void *start_work = p + 3 * page_size;
void *tail_guard = start_work + len;
- if (munmap(p, page_size) || munmap(tail_guard, page_size))
+ if (munmap(p, page_size) ||
+ munmap(p + 2 * page_size, page_size) ||
+ munmap(tail_guard, page_size) ||
+ munmap(tail_guard + 2 * page_size, page_size))
perror_msg_and_fail("munmap");
memset(start_work, 0xff, len);
