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Fri, 04 Oct 2019 06:26:06 -0700 (PDT) Date: Fri, 4 Oct 2019 15:25:55 +0200 In-Reply-To: <20191004132555.202973-1-glider@google.com> Message-Id: <20191004132555.202973-2-glider@google.com> Mime-Version: 1.0 References: <20191004132555.202973-1-glider@google.com> X-Mailer: git-send-email 2.23.0.581.g78d2f28ef7-goog Subject: [PATCH v1 2/2] lib/test_meminit: add a kmem_cache_alloc_bulk() test From: Alexander Potapenko To: Andrew Morton , Christoph Lameter Cc: Alexander Potapenko , Kees Cook , linux-mm@kvack.org, kernel-hardening@lists.openwall.com X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Make sure allocations from kmem_cache_alloc_bulk()/kmem_cache_free_bulk() are properly initialized. Signed-off-by: Alexander Potapenko Cc: Kees Cook To: Andrew Morton To: Christoph Lameter Cc: linux-mm@kvack.org Cc: kernel-hardening@lists.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;