Rename kmalloc_large_oob_right() to kmalloc_pagealloc_oob_right(), as the
test only checks the page allocator functionality.
Also reimplement kmalloc_large_oob_right() so that the test allocates a
large enough chunk of memory that still does not trigger the page
allocator fallback.
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
---
v2: - Merged "kasan: Change the behavior of kmalloc_large_oob_right" and
"kasan: Changed kmalloc_large_oob_right, added kmalloc_pagealloc_oob_right"
from v1
v3: - Minor description changes
---
lib/test_kasan.c | 28 +++++++++++++++++++++++++++-
1 file changed, 27 insertions(+), 1 deletion(-)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index c32f3b0..90ad74f 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -65,11 +65,34 @@ static noinline void __init kmalloc_node_oob_right(void)
kfree(ptr);
}
-static noinline void __init kmalloc_large_oob_right(void)
+#ifdef CONFIG_SLUB
+static noinline void __init kmalloc_pagealloc_oob_right(void)
{
char *ptr;
size_t size = KMALLOC_MAX_CACHE_SIZE + 10;
+ /* Allocate a chunk that does not fit into a SLUB cache to trigger
+ * the page allocator fallback.
+ */
+ pr_info("kmalloc pagealloc allocation: out-of-bounds to right\n");
+ ptr = kmalloc(size, GFP_KERNEL);
+ if (!ptr) {
+ pr_err("Allocation failed\n");
+ return;
+ }
+
+ ptr[size] = 0;
+ kfree(ptr);
+}
+#endif
+
+static noinline void __init kmalloc_large_oob_right(void)
+{
+ char *ptr;
+ size_t size = KMALLOC_MAX_CACHE_SIZE - 256;
+ /* Allocate a chunk that is large enough, but still fits into a slab
+ * and does not trigger the page allocator fallback in SLUB.
+ */
pr_info("kmalloc large allocation: out-of-bounds to right\n");
ptr = kmalloc(size, GFP_KERNEL);
if (!ptr) {
@@ -324,6 +347,9 @@ static int __init kmalloc_tests_init(void)
kmalloc_oob_right();
kmalloc_oob_left();
kmalloc_node_oob_right();
+#ifdef CONFIG_SLUB
+ kmalloc_pagealloc_oob_right();
+#endif
kmalloc_large_oob_right();
kmalloc_oob_krealloc_more();
kmalloc_oob_krealloc_less();
--
2.7.0.rc3.207.g0ac5344
--
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