[RFC v6 48/62] selftest/vm: clear the bits in shadow reg when a pkey is freed.
From: Ram Pai <hidden>
Date: 2017-07-16 04:04:06
Also in:
linux-arch, linuxppc-dev, lkml
Subsystem:
kernel selftest framework, the rest · Maintainers:
Shuah Khan, Linus Torvalds
When a key is freed, the key is no more effective. Clear the bits corresponding to the pkey in the shadow register. Otherwise it will carry some spurious bits which can trigger false-positive asserts. Signed-off-by: Ram Pai <redacted> --- tools/testing/selftests/vm/protection_keys.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 0f2d1ce..4f4ce36 100644
--- a/tools/testing/selftests/vm/protection_keys.c
+++ b/tools/testing/selftests/vm/protection_keys.c@@ -582,6 +582,9 @@ int alloc_pkey(void) int sys_pkey_free(unsigned long pkey) { int ret = syscall(SYS_pkey_free, pkey); + + if (!ret) + shadow_pkey_reg &= reset_bits(pkey, PKEY_DISABLE_ACCESS); dprintf1("%s(pkey=%ld) syscall ret: %d\n", __func__, pkey, ret); return ret; }
--
1.7.1
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