kselftest/arm64: pac: Fix skipping of tests on systems without PAC

stable inclusion
from stable-5.10.67
commit 0df5eba67bf05663bfc044865c8daddaf3a2cb4a
bugzilla: 182619 https://gitee.com/openeuler/kernel/issues/I4EWO7

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0df5eba67bf05663bfc044865c8daddaf3a2cb4a

--------------------------------

[ Upstream commit 0c69bd2c ]

The PAC tests check to see if the system supports the relevant PAC features
but instead of skipping the tests if they can't be executed they fail the
tests which makes things look like they're not working when they are.
Signed-off-by: NMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210819165723.43903-1-broonie@kernel.orgSigned-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

tools/testing/selftests/arm64/pauth/pac.c

@@ -25,13 +25,15 @@
 do { \
 	unsigned long hwcaps = getauxval(AT_HWCAP); \
 	/* data key instructions are not in NOP space. This prevents a SIGILL */ \
-	ASSERT_NE(0, hwcaps & HWCAP_PACA) TH_LOG("PAUTH not enabled"); \
+	if (!(hwcaps & HWCAP_PACA))					\
+		SKIP(return, "PAUTH not enabled"); \
 } while (0)
 #define ASSERT_GENERIC_PAUTH_ENABLED() \
 do { \
 	unsigned long hwcaps = getauxval(AT_HWCAP); \
 	/* generic key instructions are not in NOP space. This prevents a SIGILL */ \
-	ASSERT_NE(0, hwcaps & HWCAP_PACG) TH_LOG("Generic PAUTH not enabled"); \
+	if (!(hwcaps & HWCAP_PACG)) \
+		SKIP(return, "Generic PAUTH not enabled");	\
 } while (0)
 
 void sign_specific(struct signatures *sign, size_t val)
@@ -256,7 +258,7 @@ TEST(single_thread_different_keys)
 	unsigned long hwcaps = getauxval(AT_HWCAP);
 
 	/* generic and data key instructions are not in NOP space. This prevents a SIGILL */
-	ASSERT_NE(0, hwcaps & HWCAP_PACA) TH_LOG("PAUTH not enabled");
+	ASSERT_PAUTH_ENABLED();
 	if (!(hwcaps & HWCAP_PACG)) {
 		TH_LOG("WARNING: Generic PAUTH not enabled. Skipping generic key checks");
 		nkeys = NKEYS - 1;
@@ -299,7 +301,7 @@ TEST(exec_changed_keys)
 	unsigned long hwcaps = getauxval(AT_HWCAP);
 
 	/* generic and data key instructions are not in NOP space. This prevents a SIGILL */
-	ASSERT_NE(0, hwcaps & HWCAP_PACA) TH_LOG("PAUTH not enabled");
+	ASSERT_PAUTH_ENABLED();
 	if (!(hwcaps & HWCAP_PACG)) {
 		TH_LOG("WARNING: Generic PAUTH not enabled. Skipping generic key checks");
 		nkeys = NKEYS - 1;