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Subject[RFC v6 56/62] selftest/vm: detect no key violation on a freed key
Date
a access-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 | 25 +++++++++++++++++++++++++
1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index bf27bcd..47c23cc 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c
@@ -1026,6 +1026,30 @@ void test_read_of_access_disabled_region_with_page_already_mapped(int *ptr,
expected_pkey_fault(pkey);
}

+void test_read_of_access_disabled_but_freed_key_region(int *ptr, u16 pkey)
+{
+ int ptr_contents;
+
+ dprintf1("disabling access to PKEY[%02d], doing read @ %p\n",
+ pkey, ptr);
+
+ /* read the content */
+ ptr_contents = read_ptr(ptr);
+ do_not_expect_pkey_fault();
+
+ /* deny key access */
+ pkey_access_deny(pkey);
+ ptr_contents = read_ptr(ptr);
+ dprintf1("*ptr: %d\n", ptr_contents);
+ expected_pkey_fault(pkey);
+
+ /* free the key without restoring access */
+ pkey_access_deny(pkey);
+ sys_pkey_free(pkey);
+ ptr_contents = read_ptr(ptr);
+ do_not_expect_pkey_fault();
+}
+
void test_write_of_write_disabled_region(int *ptr, u16 pkey)
{
dprintf1("disabling write access to PKEY[%02d], doing write\n", pkey);
@@ -1333,6 +1357,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
test_pkey_syscalls_on_non_allocated_pkey,
test_pkey_syscalls_bad_args,
test_pkey_alloc_exhaust,
+ test_read_of_access_disabled_but_freed_key_region,
};

void run_tests_once(void)
--
1.7.1
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