[v13,20/24] selftests/vm: associate key on a mapped page and detect write violation

Message ID 1528937115-10132-21-git-send-email-linuxram@us.ibm.com
State Superseded
Headers show
Series
  • selftests, powerpc, x86 : Memory Protection Keys
Related show

Commit Message

Ram Pai June 14, 2018, 12:45 a.m.
detect write-violation on a page to which write-disabled
key is associated much after the page is mapped.

cc: Dave Hansen <dave.hansen@intel.com>
cc: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Acked-by: Dave Hansen <dave.hansen@intel.com>
---
 tools/testing/selftests/vm/protection_keys.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

Patch

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 04d0249..f4acd72 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1042,6 +1042,17 @@  void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
 	expected_pkey_fault(pkey);
 }
 
+void test_write_of_write_disabled_region_with_page_already_mapped(int *ptr,
+		u16 pkey)
+{
+	*ptr = __LINE__;
+	dprintf1("disabling write access; after accessing the page, "
+		"to PKEY[%02d], doing write\n", pkey);
+	pkey_write_deny(pkey);
+	*ptr = __LINE__;
+	expected_pkey_fault(pkey);
+}
+
 void test_write_of_write_disabled_region(int *ptr, u16 pkey)
 {
 	dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
@@ -1422,6 +1433,7 @@  void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
 	test_read_of_access_disabled_region,
 	test_read_of_access_disabled_region_with_page_already_mapped,
 	test_write_of_write_disabled_region,
+	test_write_of_write_disabled_region_with_page_already_mapped,
 	test_write_of_access_disabled_region,
 	test_kernel_write_of_access_disabled_region,
 	test_kernel_write_of_write_disabled_region,