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Date: Mon, 7 Oct 2019 11:16:05 +0200
From: glider@...gle.com
To: Andrew Morton <akpm@...ux-foundation.org>, Christoph Lameter <cl@...ux.com>
Cc: Alexander Potapenko <glider@...gle.com>, Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH 2/2] lib/test_meminit: add a kmem_cache_alloc_bulk() test
Make sure allocations from kmem_cache_alloc_bulk()/kmem_cache_free_bulk()
are properly initialized.
Signed-off-by: Alexander Potapenko <glider@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>
To: Christoph Lameter <cl@...ux.com>
Cc: linux-mm@...ck.org
Cc: kernel-hardening@...ts.openwall.com
---
lib/test_meminit.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/lib/test_meminit.c b/lib/test_meminit.c
index 9729f271d150..9742e5cb853a 100644
--- a/lib/test_meminit.c
+++ b/lib/test_meminit.c
@@ -297,6 +297,32 @@ static int __init do_kmem_cache_rcu_persistent(int size, int *total_failures)
return 1;
}
+static int __init do_kmem_cache_size_bulk(int size, int *total_failures)
+{
+ struct kmem_cache *c;
+ int i, iter, maxiter = 1024;
+ int num, bytes;
+ bool fail = false;
+ void *objects[10];
+
+ c = kmem_cache_create("test_cache", size, size, 0, NULL);
+ for (iter = 0; (iter < maxiter) && !fail; iter++) {
+ num = kmem_cache_alloc_bulk(c, GFP_KERNEL, ARRAY_SIZE(objects),
+ objects);
+ for (i = 0; i < num; i++) {
+ bytes = count_nonzero_bytes(objects[i], size);
+ if (bytes)
+ fail = true;
+ fill_with_garbage(objects[i], size);
+ }
+
+ if (num)
+ kmem_cache_free_bulk(c, num, objects);
+ }
+ *total_failures += fail;
+ return 1;
+}
+
/*
* Test kmem_cache allocation by creating caches of different sizes, with and
* without constructors, with and without SLAB_TYPESAFE_BY_RCU.
@@ -318,6 +344,7 @@ static int __init test_kmemcache(int *total_failures)
num_tests += do_kmem_cache_size(size, ctor, rcu, zero,
&failures);
}
+ num_tests += do_kmem_cache_size_bulk(size, &failures);
}
REPORT_FAILURES_IN_FN();
*total_failures += failures;
--
2.23.0.581.g78d2f28ef7-goog
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