[v9,39/51] selftest/vm: clear the bits in shadow reg when a pkey is freed.

Message ID 1509958663-18737-40-git-send-email-linuxram@us.ibm.com
State New
Headers show
Series
  • powerpc, mm: Memory Protection Keys
Related show

Commit Message

Ram Pai Nov. 6, 2017, 8:57 a.m.
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>
---
 tools/testing/selftests/vm/protection_keys.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Patch

diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c
index 384cc9a..2823d4d 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;
 }