[PATCH v2 1/7] kasan: Modify kmalloc_large_oob_right(), add kmalloc_pagealloc_oob_right()
From: Alexander Potapenko <glider@google.com>
Date: 2016-02-18 17:16:22
Also in:
lkml
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
This change renames kmalloc_large_oob_right() to kmalloc_pagealloc_oob_right(), as the test only checks the page allocator functionality. It also reimplements 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@google.com> --- 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 --- 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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