From d13c22517a8a6cfe77a5046fdf636ae9468271e5 Mon Sep 17 00:00:00 2001
From: Ram Pai <linuxram@us.ibm.com>
Date: Mon, 22 Jan 2018 10:52:01 -0800
Subject: [PATCH 14/30] selftests/vm: clear the bits in shadow reg when a pkey
is freed.
References: FATE#322447, bsc#1078248
Patch-mainline: submitted https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-January/168234.html
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 <linuxram@us.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
tools/testing/selftests/vm/protection_keys.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index ca54a953bd61..aaf9f09fe013 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;
}
--
2.13.6