From: Ram Pai linuxram@us.ibm.com
Detect write-violation on a page to which access-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 | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index babe3f6310f2..38ac3211d214 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1026,6 +1026,18 @@ 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; @@ -1422,6 +1434,7 @@ void (*pkey_tests[])(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,