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Subject[RFC v6 58/62] selftest/vm: detect no write key-violation on a freed key
Date
a write-denied key should not trigger any key violation
after the key has been freed.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
tools/testing/selftests/vm/protection_keys.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index e35cef5..07df8cf 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1068,6 +1068,23 @@ void test_write_of_write_disabled_region(int *ptr, u16 pkey)
*ptr = __LINE__;
expected_pkey_fault(pkey);
}
+
+void test_write_of_write_disabled_but_freed_key_region(int *ptr, u16 pkey)
+{
+ dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
+ *ptr = __LINE__;
+ do_not_expect_pkey_fault();
+
+ pkey_write_deny(pkey);
+ *ptr = __LINE__;
+ expected_pkey_fault(pkey);
+
+ pkey_write_deny(pkey);
+ sys_pkey_free(pkey);
+ *ptr = __LINE__;
+ do_not_expect_pkey_fault();
+}
+
void test_write_of_access_disabled_region(int *ptr, u16 pkey)
{
dprintf1("disabling access to PKEY[%02d], doing write\n", pkey);
@@ -1370,6 +1387,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
test_pkey_syscalls_bad_args,
test_pkey_alloc_exhaust,
test_read_of_access_disabled_but_freed_key_region,
+ test_write_of_write_disabled_but_freed_key_region,
};

void run_tests_once(void)
--
1.7.1
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