detect write-violation on a page to which access-disabled
key is associated much after the page is mapped.
cc: Dave Hansen <dave.hansen@xxxxxxxxx>
cc: Florian Weimer <fweimer@xxxxxxxxxx>
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>
---
tools/testing/selftests/vm/protection_keys.c | 13 +++++++++++++
1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 59f6f33..8a6afdd 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1063,6 +1063,18 @@ 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;
@@ -1430,6 +1442,7 @@ 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,
--
1.7.1
