From patchwork Sat Feb 3 12:26:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 769678 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 E9AEC7F7C4; Sat, 3 Feb 2024 12:34:01 +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=1706963642; cv=none; b=KCDltrnfJjDSuKJKxUME2mqNEaFYvtvQ5YDoluWBOUmF4AWeHtpZg7GgJXN17nTgQSDBEhbeEWPyTxkVaftCpcm34CkBSrj6e27Fj2jpsGqfxQ/VQ3pm9cw3VJecrsEFuAzp7Dl9C/11aI2p5fgdveDSiTX/z6KSzMJLUqn5pHk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706963642; c=relaxed/simple; bh=WXqbYsgYYOXFEeMs+roJ3AXRYBhuL60ozPF+o7O4bAk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=J0x4Q2/WSGuE4Gggb/RW1lKOpYVeFpOhQk2Pnpk/rt7+MXSnnUuRNbd5TtnexsVURHUPatuj4INhCIVWkXDTFk++qA/j55HOY4505t/GNtqwKMCbSfoIa46L/DZYc0cwsZQbFX4jkO7jTHNwo6UkcqN/02EJYmIlUuNIQaeoGIQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=F78PhGGK; 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="F78PhGGK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35D85C43394; Sat, 3 Feb 2024 12:33:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706963641; bh=WXqbYsgYYOXFEeMs+roJ3AXRYBhuL60ozPF+o7O4bAk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=F78PhGGK2tKTlc1p2op6t75h6sAseztGvobKzgGSABUqePNhCLv6h7b0MXYZozVvf TMoM8VKK0ZO5F2e6/66jeGgtskS0UMHEiCAZUXqg+6vxYh1xgH6tpBdIJiNPgo7YpK EnaGYjMB/A//4+Sjcv0gbyN2txDslqcYGoLlVah+34dTkNIBFZPTZDpK5wR3pQL70I Dzxx0jU1Bjxx/D0JoI4d/HNBk5LzI9/lGYtAoE48s/fM91juriLFdFQwpik4auJ+g4 1D/HN4P1oVK7bX97yoTav7bFx3jIr53qvhASYz8zdLRC/yDEo0s7d2QHFhc9ilv97S gLO6O0zcUVi6Q== From: Mark Brown Date: Sat, 03 Feb 2024 12:26:04 +0000 Subject: [PATCH v8 38/38] kselftest: Provide shadow stack enable helpers for arm64 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240203-arm64-gcs-v8-38-c9fec77673ef@kernel.org> References: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> In-Reply-To: <20240203-arm64-gcs-v8-0-c9fec77673ef@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 , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , 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 0.13-dev-a684c X-Developer-Signature: v=1; a=openpgp-sha256; l=2372; i=broonie@kernel.org; h=from:subject:message-id; bh=WXqbYsgYYOXFEeMs+roJ3AXRYBhuL60ozPF+o7O4bAk=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlvjDvM7ObtGoCDxxiAl89DYa6RzxdLnWQy+FkForz aUSU5kiJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZb4w7wAKCRAk1otyXVSH0NEICA CCvybEtXLigY0Lceu5RSwEZ8U+9W6svq5+knPV3mZQY4TSxy9Yy4lyeVk8Pv21v/12qFvp6uqzLp0g k6+WV9GRZ/Pqfacx9BQ00Oc/rfhKVczK0MsQz3mDGVuLKbJ4qSNpb8/dqtFqZr2ObsOcGe2ZV7T/CG ALJt/tNjptHMxvEWIyQI3z/Smo1ZEdn4C7yaVXufiGkwDmFEB8wquT7O7Dh3npGDpxL78q4rAtfJy+ 8dPSdobFohDZMcnrMhjgw8Klf2bbVp8Sut5M7DVJ/t3nRkqxRoYhyVFTjjG6NdjDWhhL+IKQdltpt4 8U4+ItNFhfAZrHX27/JjU9V30WRy/h X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Allow test programs to use the shadow stack helpers on arm64. 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..223e24b4eb80 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 72 +# 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