lib/test_meminit: add a kmem_cache_alloc_bulk() test

Make sure allocations from kmem_cache_alloc_bulk() and
kmem_cache_free_bulk() are properly initialized.

Link: http://lkml.kernel.org/r/20191007091605.30530-2-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Thibaut Sautereau <thibaut@sautereau.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/test_meminit.c b/lib/test_meminit.c
index 9729f27..9742e5c 100644 (file)
--- a/lib/test_meminit.c
+++ b/lib/test_meminit.c
@@ -297,6 +297,32 @@ out:
        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;