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 8CF5F33F390; Tue, 7 Jul 2026 19:11:56 +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=1783451517; cv=none; b=RcsOYb+KCG+XShAeJWhk/+MqIoWeokxV1k/jOk19mDxD21aLT4b6ycXQChY4LhlOcdDI/FzJC4eZvP95rED0Nmg/NjM8Z5k/KnE299Gh6oHsxOYA267wk66jl60/K4hh2XK9QyiHXQRg7vmYlkn33kmsJa3N0zX9Lngl84zkg2M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783451517; c=relaxed/simple; bh=ns1Plvef9yH2InVozXYU85Sza7nfDL2Vk2gfwHbma1M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uYzo5bvk1PwFB1ZNjz1+1x3vbcP6eNLDOXeGGzOkUGrR0QWVXGgm2EJMtLh9UBph2ZVTJTFNsAHkMFCxzVg7w4Ja41POJRZqS6H5O+YnYdDUsA9NFFjxmjtWTp0WUNPATTe4R0HTPyFuXacrFZJNFGhYihDrsBonEdwxqD/Lr/o= 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=lUW4LM6x; 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="lUW4LM6x" 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 B2BCA3296; Tue, 7 Jul 2026 12:11:51 -0700 (PDT) Received: from fedora (LJ9QCPV96V.austin.arm.com [10.118.109.146]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AFADE3F905; Tue, 7 Jul 2026 12:11:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1783451516; bh=ns1Plvef9yH2InVozXYU85Sza7nfDL2Vk2gfwHbma1M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lUW4LM6xMjO4/pqEQ+c+Kmn6H5MSUekT1UiWdmZZ6u3VMZPvtTc/2ZPqWW1hZluz2 CkL0CiNa2GHZ7slS0iMjdSGQol/frnY4HaN9znvotyYGo60P3I24HB0mga43lvRiuC vebfxwVWW3ll5DBHzayFg5lJ4lLqSbUY9KNxiTmk= 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 v2 2/2] selftest/x86: test ARCH_SHSTK_UNLOCK Date: Tue, 7 Jul 2026 14:11:36 -0500 Message-ID: <20260707191136.1732277-2-bill.roberts@arm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260707191136.1732277-1-bill.roberts@arm.com> References: <20260707191136.1732277-1-bill.roberts@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Test that ARCH_SHSTK_UNLOCK can't be called from normal (non-ptrace) context. 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 3d6ca33edba4..cbe7ca4ebd90 100644 --- a/tools/testing/selftests/x86/test_shadow_stack.c +++ b/tools/testing/selftests/x86/test_shadow_stack.c @@ -1059,6 +1059,14 @@ int main(int argc, char *argv[]) { int ret = 0; + /* Test that ARCH_SHSTK_UNLOCK can't be called from normal (non-ptrace) context. */ + if (!ARCH_PRCTL(ARCH_SHSTK_UNLOCK, ARCH_SHSTK_SHSTK)) { + printf("[FAIL]\tARCH_SHSTK_UNLOCK should fail in a non-ptrace context\n"); + goto out; + } + + 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