From: Ram Pai linuxram@us.ibm.com
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 Signed-off-by: Sandipan Das sandipan@linux.ibm.com --- tools/testing/selftests/vm/protection_keys.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 526ad2fea316..babe3f6310f2 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1001,6 +1001,17 @@ 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); @@ -1409,6 +1420,7 @@ void (*pkey_tests[])(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,