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Date: Mon, 23 Apr 2018 16:54:57 +0400
From: Igor Stoppa <igor.stoppa@...il.com>
To: willy@...radead.org,
keescook@...omium.org,
paul@...l-moore.com,
sds@...ho.nsa.gov,
mhocko@...nel.org,
corbet@....net
Cc: labbott@...hat.com,
linux-cc=david@...morbit.com,
--cc=rppt@...ux.vnet.ibm.com,
--security-module@...r.kernel.org,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com,
igor.stoppa@...il.com,
Igor Stoppa <igor.stoppa@...wei.com>
Subject: [PATCH 8/9] Preliminary self test for pmalloc rare write
Try to alter locked but modifiable pools.
The test neds some cleanup and expansion.
It is provided primarily as reference.
Signed-off-by: Igor Stoppa <igor.stoppa@...wei.com>
---
mm/test_pmalloc.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 75 insertions(+)
diff --git a/mm/test_pmalloc.c b/mm/test_pmalloc.c
index c8835207a400..e8e945e4a4a3 100644
--- a/mm/test_pmalloc.c
+++ b/mm/test_pmalloc.c
@@ -122,6 +122,80 @@ static void test_oovm(void)
pmalloc_destroy_pool(pool);
}
+#define REGION_SIZE (PAGE_SIZE / 4)
+#define REGION_NUMBERS 12
+static inline void fill_region(char *addr, char c)
+{
+ size_t i;
+
+ for (i = 0; i < REGION_SIZE - 1; i++)
+ addr[i] = c;
+ addr[i] = '\0';
+}
+
+static inline void init_regions(char *array)
+{
+ size_t i;
+
+ for (i = 0; i < REGION_NUMBERS; i++)
+ fill_region(array + REGION_SIZE * i, i + 'A');
+}
+
+static inline void show_regions(char *array)
+{
+ size_t i;
+
+ for (i = 0; i < REGION_NUMBERS; i++)
+ pr_info("%s", array + REGION_SIZE * i);
+}
+
+static inline void init_big_injection(char *big_injection)
+{
+ size_t i;
+
+ for (i = 0; i < PAGE_SIZE * 3; i++)
+ big_injection[i] = 'X';
+}
+
+/* Verify rewritable feature. */
+static int test_rare_write(void)
+{
+ struct pmalloc_pool *pool;
+ char *array;
+ char injection[] = "123456789";
+ unsigned short size = sizeof(injection);
+ char *big_injection;
+
+
+ pr_notice("Test pmalloc_rare_write()");
+ pool = pmalloc_create_pool(PMALLOC_RW);
+ array = pzalloc(pool, REGION_SIZE * REGION_NUMBERS);
+ init_regions(array);
+ pmalloc_protect_pool(pool);
+ pr_info("------------------------------------------------------");
+ pmalloc_rare_write(pool, array, injection, size);
+ pmalloc_rare_write(pool, array + REGION_SIZE, injection, size);
+ pmalloc_rare_write(pool,
+ array + 5 * REGION_SIZE / 2 - size / 2,
+ injection, size);
+ pmalloc_rare_write(pool, array + 3 * REGION_SIZE - size / 2,
+ injection, size);
+ show_regions(array);
+ pmalloc_destroy_pool(pool);
+ pr_info("------------------------------------------------------");
+ pool = pmalloc_create_pool(PMALLOC_RW);
+ array = pzalloc(pool, REGION_SIZE * REGION_NUMBERS);
+ init_regions(array);
+ pmalloc_protect_pool(pool);
+ big_injection = vmalloc(PAGE_SIZE * 3);
+ init_big_injection(big_injection);
+ pmalloc_rare_write(pool, array + REGION_SIZE / 2, big_injection,
+ PAGE_SIZE * 2);
+ show_regions(array);
+ pr_info("------------------------------------------------------");
+ return 0;
+}
+
/**
* test_pmalloc() -main entry point for running the test cases
*/
@@ -135,4 +209,5 @@ void test_pmalloc(void)
test_is_pmalloc_object())))
return;
test_oovm();
+ test_rare_write();
}
--
2.14.1
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