[v9,48/51] selftest/vm: detect write violation on a mapped access-denied-key page

Message ID 1509958663-18737-49-git-send-email-linuxram@us.ibm.com
State New
Headers show
Series
  • powerpc, mm: Memory Protection Keys
Related show

Commit Message

Ram Pai Nov. 6, 2017, 8:57 a.m.
detect write-violation on a page to which access-disabled
key is associated much after the page is mapped.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
 tools/testing/selftests/vm/protection_keys.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

Patch

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 0b7b826..c790bff 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1058,6 +1058,18 @@  void test_write_of_access_disabled_region(int *ptr, u16 pkey)
 	*ptr = __LINE__;
 	expected_pkey_fault(pkey);
 }
+
+void test_write_of_access_disabled_region_with_page_already_mapped(int *ptr,
+			u16 pkey)
+{
+	*ptr = __LINE__;
+	dprintf1("disabling access; after accessing the page, "
+		" to PKEY[%02d], doing write\n", pkey);
+	pkey_access_deny(pkey);
+	*ptr = __LINE__;
+	expected_pkey_fault(pkey);
+}
+
 void test_kernel_write_of_access_disabled_region(int *ptr, u16 pkey)
 {
 	int ret;
@@ -1342,6 +1354,7 @@  void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
 	test_write_of_write_disabled_region,
 	test_write_of_write_disabled_region_with_page_already_mapped,
 	test_write_of_access_disabled_region,
+	test_write_of_access_disabled_region_with_page_already_mapped,
 	test_kernel_write_of_access_disabled_region,
 	test_kernel_write_of_write_disabled_region,
 	test_kernel_gup_of_access_disabled_region,