[RFC v6 58/62] selftest/vm: detect no write key-violation on a freed key
From: Ram Pai <hidden>
Date: 2017-07-16 04:01:40
Also in:
linux-arch, linuxppc-dev, lkml
Subsystem:
kernel selftest framework, the rest · Maintainers:
Shuah Khan, Linus Torvalds
a write-denied key should not trigger any key violation after the key has been freed. Signed-off-by: Ram Pai <redacted> --- 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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