From patchwork Thu Aug 1 12:06:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13750370 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3BBC61A38D6; Thu, 1 Aug 2024 13:00:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722517237; cv=none; b=aCdy9mwlWr/aByHY0ujYJiAoWhzYwLLlbLX5uj3TJuGpjnPV5Kr+azwgGaWXskRMpv0AXoQAH8rNO2g1iEItDwdBQ4UnDhmbiUphiE3acTdpoxdGLqs0D2iDurmbc3xgVGv1SpWBPWxWIbtYaBBvle1zIPoeDZQ2EMcocppWuno= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722517237; c=relaxed/simple; bh=18sWPiMz/2PRxXCIvtfcK7spgh5pr5ZrfaiB3z+47E4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=pFHwUXUDD+aHS52+QDXvYDR5ES0LW2nSUPT6ku3i9AD1q5F/eIWVnMbck7NdQT55UqM5n7It6k2H/GKu3sQYlSQbVOOChTMGsvNFJuyOKfwacjePAs/6FPgwwnKT/4BXalIiIXy7lPxKUum2+VIAMnRQEkEN660e05Eb03kwKOk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LLg1OHA3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LLg1OHA3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56ABDC4AF09; Thu, 1 Aug 2024 13:00:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722517236; bh=18sWPiMz/2PRxXCIvtfcK7spgh5pr5ZrfaiB3z+47E4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=LLg1OHA31BGAOp+FcPmnJJOjzfR45mz7vsAtPMUFCrp3V7jiNukUbotugAHXE9tfV aIcA8L9FYxshLmS4g00Xcx4OAeSAXMA7Cx6hpLIH3QZnSQCt8YXedBHO8JI/yttRb9 JpkHjxdKoSHdhI9vBqBIdnPygpaZJ95EUystul9JiKsQD6DkVqldmjSesjTbLv0sqm NikT1hoabasrT4HukGBspGC81nPLvOcQeycfSnyUlng10ZobRMGQEKzhITf55ljibS VtYKfgXcpzqVAaAmo+gfDKDoKfc1vsoY8HVPiXk+19EWEoJEiduwxjrgaCrru96J69 z1MECEs5pWqoQ== From: Mark Brown Date: Thu, 01 Aug 2024 13:06:55 +0100 Subject: [PATCH v10 28/40] kselftest: Provide shadow stack enable helpers for arm64 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240801-arm64-gcs-v10-28-699e2bd2190b@kernel.org> References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> In-Reply-To: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=2438; i=broonie@kernel.org; h=from:subject:message-id; bh=18sWPiMz/2PRxXCIvtfcK7spgh5pr5ZrfaiB3z+47E4=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmq4YbFMDh5Ckm74QVwECa6WtHKMFE+UgmODNhyXqy jR+iB0mJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZquGGwAKCRAk1otyXVSH0P71B/ 9V7hV3CQrkTFd7jDYY3vyp6DGdl60ANtDN9HiUq6OdnYyjo74919F2XR8dM7OFco4J0gWHLqcHOJMQ mCqdEM4vB9PQSvpXx2GH03cxvxIqdqfE55+qgXzqgNbizwwLZUpwdgD5RHVNHSFRB9W/bjx+JZXJqE PKyTwIymZZopYRk+Y7ejaWLDSbbzDu0NF6S8j6E5VbD9oU0rsQLaLyqdWH6OjAzZA3A/kzW6XVepic IbfLQ4Lre1T22ts5jLylYp9CPZR3M4w4IURa3eyhuBgX98WzddCT/kBy8n9tPazpRw0cDNsaEqUins yEg+6uGOgaqj7quxk0iWHDXsMAOH09 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Allow test programs to use the shadow stack helpers on arm64. Reviewed-by: Thiago Jung Bauermann Signed-off-by: Mark Brown --- tools/testing/selftests/ksft_shstk.h | 37 ++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/tools/testing/selftests/ksft_shstk.h b/tools/testing/selftests/ksft_shstk.h index 85d0747c1802..302957a0bbd5 100644 --- a/tools/testing/selftests/ksft_shstk.h +++ b/tools/testing/selftests/ksft_shstk.h @@ -50,6 +50,43 @@ static inline __attribute__((always_inline)) void enable_shadow_stack(void) #endif +#ifdef __aarch64__ +#define PR_SET_SHADOW_STACK_STATUS 75 +# define PR_SHADOW_STACK_ENABLE (1UL << 0) + +#define my_syscall2(num, arg1, arg2) \ +({ \ + register long _num __asm__ ("x8") = (num); \ + register long _arg1 __asm__ ("x0") = (long)(arg1); \ + register long _arg2 __asm__ ("x1") = (long)(arg2); \ + register long _arg3 __asm__ ("x2") = 0; \ + register long _arg4 __asm__ ("x3") = 0; \ + register long _arg5 __asm__ ("x4") = 0; \ + \ + __asm__ volatile ( \ + "svc #0\n" \ + : "=r"(_arg1) \ + : "r"(_arg1), "r"(_arg2), \ + "r"(_arg3), "r"(_arg4), \ + "r"(_arg5), "r"(_num) \ + : "memory", "cc" \ + ); \ + _arg1; \ +}) + +#define ENABLE_SHADOW_STACK +static inline __attribute__((always_inline)) void enable_shadow_stack(void) +{ + int ret; + + ret = my_syscall2(__NR_prctl, PR_SET_SHADOW_STACK_STATUS, + PR_SHADOW_STACK_ENABLE); + if (ret == 0) + shadow_stack_enabled = true; +} + +#endif + #ifndef __NR_map_shadow_stack #define __NR_map_shadow_stack 453 #endif