From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 92B6C3ACEEB; Mon, 15 Jun 2026 19:52:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781553149; cv=none; b=LzLXxbs6948yYdye2VHHdsfv0HAxpvVb4Rq1EFpG9kxWWGja+ZETiNKJXMkuV7HIauXkNce8NPeFQm5rQ4zNFN3wucjFbZNXvQlEh/vf1/PxYImbT2cyqW71mswQTZ5cHtceMndXdNN/utAFcgUn8njNOu/NNwPzu1Tl+tC1x+w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781553149; c=relaxed/simple; bh=Wv/bUKA4KjTgjPmC6F1peCpuW0JmKfAYNy55jBf2yDo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ipuBALby2KVd0hyPZnWPDpxV/3iYSdrE95+Xm4S+P/0LZvC1TR0RgYZ7PdqVM7jvNscCYwicBL20wOIc59QbQDFoUnkuuk/taUfu53/HvUM1PP7qTg3Nh7dMN7XxyY+4HKycvZFkTcW/juoKdMt+MEVEhGFr8yU7V8VNINTyloM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=u0CqFXBs; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="u0CqFXBs" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6BCE93558; Mon, 15 Jun 2026 12:52:22 -0700 (PDT) Received: from fedora (LJ9QCPV96V.austin.arm.com [10.118.102.30]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9C0C63F763; Mon, 15 Jun 2026 12:52:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1781553147; bh=Wv/bUKA4KjTgjPmC6F1peCpuW0JmKfAYNy55jBf2yDo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u0CqFXBsmRO2ke5nFWE2u/WKFfEec8FEToweyiLipYYzAZedGt3bitjIVNj1sDgpJ PWtJS0NqXGs7kzN6NSUCPo6jh4kYBQYA5IWNNfRRe9bxoGu/0ibYhHpfmanofRZ08b gSmejkwyOnfBf0y3e4QKGFKtu6RAusmeV+dLqzAw= From: Bill Roberts To: rick.p.edgecombe@intel.com, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Shuah Khan Cc: Bill Roberts , 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 Message-ID: <20260615195156.257950-2-bill.roberts@arm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260615195156.257950-1-bill.roberts@arm.com> References: <20260615195156.257950-1-bill.roberts@arm.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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