From: Bill Roberts <bill.roberts@arm.com>
To: rick.p.edgecombe@intel.com, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Shuah Khan <shuah@kernel.org>
Cc: Bill Roberts <bill.roberts@arm.com>,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: [PATCH 2/2] selftest/x86: test ARCH_SHSTK_UNLOCK
Date: Mon, 15 Jun 2026 14:51:55 -0500 [thread overview]
Message-ID: <20260615195156.257950-2-bill.roberts@arm.com> (raw)
In-Reply-To: <20260615195156.257950-1-bill.roberts@arm.com>
One should not be able to use ARCH_SHSTK_UNLOCK via arch_prctl to twiddle
feature bits, test that this is the case.
Signed-off-by: Bill Roberts <bill.roberts@arm.com>
---
tools/testing/selftests/x86/test_shadow_stack.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/tools/testing/selftests/x86/test_shadow_stack.c b/tools/testing/selftests/x86/test_shadow_stack.c
index 21af54d5f4ea..82a5fefa9df5 100644
--- a/tools/testing/selftests/x86/test_shadow_stack.c
+++ b/tools/testing/selftests/x86/test_shadow_stack.c
@@ -979,6 +979,14 @@ int main(int argc, char *argv[])
{
int ret = 0;
+ /* test that we can't use unlock to set shadow stack */
+ if (!ARCH_PRCTL(ARCH_SHSTK_UNLOCK, ARCH_SHSTK_SHSTK)) {
+ printf("[SKIP]\tCould enable Shadow stack via UNLOCK\n");
+ return 1;
+ }
+
+ printf("[OK]\tCouldn't enable Shadow stack via UNLOCK\n");
+
if (ARCH_PRCTL(ARCH_SHSTK_ENABLE, ARCH_SHSTK_SHSTK)) {
printf("[SKIP]\tCould not enable Shadow stack\n");
return 1;
--
2.54.0
next prev parent reply other threads:[~2026-06-15 19:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-15 19:51 [PATCH 1/2] arch/x86: do not allow unlock to set bits Bill Roberts
2026-06-15 19:51 ` Bill Roberts [this message]
2026-06-29 21:46 ` [PATCH 2/2] selftest/x86: test ARCH_SHSTK_UNLOCK Edgecombe, Rick P
2026-06-29 17:09 ` Bill Roberts
2026-06-30 17:02 ` Edgecombe, Rick P
2026-06-29 21:57 ` Edgecombe, Rick P
2026-06-29 17:13 ` Bill Roberts
2026-06-29 21:44 ` [PATCH 1/2] arch/x86: do not allow unlock to set bits Edgecombe, Rick P
2026-06-29 17:05 ` Bill Roberts
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