aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorRam Pai <[email protected]>2020-06-04 16:52:36 -0700
committerLinus Torvalds <[email protected]>2020-06-04 19:06:27 -0700
commit4e06e718afd71f99592a76a29167e9cd617b2b09 (patch)
treeb5baeb52761025abd174df94e17e31649881e917
parent39351c1326cf72d9b01c5faa3de23153727832f5 (diff)
selftests/vm/pkeys: detect write violation on a mapped access-denied-key page
Detect write-violation on a page to which access-disabled key is associated much after the page is mapped. Signed-off-by: Ram Pai <[email protected]> Signed-off-by: Sandipan Das <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Acked-by: Dave Hansen <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Florian Weimer <[email protected]> Cc: "Desnes A. Nunes do Rosario" <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Thiago Jung Bauermann <[email protected]> Cc: "Aneesh Kumar K.V" <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Michal Suchanek <[email protected]> Cc: Shuah Khan <[email protected]> Link: http://lkml.kernel.org/r/6a7dd4069ee18a2a51b207a55aa197f3f3c59753.1585646528.git.sandipan@linux.ibm.com Signed-off-by: Linus Torvalds <[email protected]>
-rw-r--r--tools/testing/selftests/vm/protection_keys.c13
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 cb31a5cdf6d9..8bb4de103874 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1027,6 +1027,18 @@ 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;
@@ -1423,6 +1435,7 @@ 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,