From patchwork Tue Jun 25 14:57:56 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13711424 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 F2CB2178390; Tue, 25 Jun 2024 15:04:01 +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=1719327842; cv=none; b=gegJcmHyV/oqPCT2LxOgUPX4ECU0M060mJnreFUEVmlLBlZJQH5bbfGorZovAhMCI43HvGXYsvT5cKyJCv/+fFVuikdh5E6Uqs6baRn4T3Bl1AwhX/Ywss9XTiomjm6HXqgBiYer8NfnF6lifZ9dRFQ0uxiOJ9nwUOXPkxlLcXc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719327842; c=relaxed/simple; bh=18sWPiMz/2PRxXCIvtfcK7spgh5pr5ZrfaiB3z+47E4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=czpcJxUjr8gogMoc5fIFktDUHfc254OQon4fcbt+nL4yLpknhuh3uJcRZHfa3zevq5UUM0iWfzRu84Q2Kxn4yYeoJs6L9aOFPZk97d2XxlxGygJbu5gunnHB/JRJs/BLIYGfcWPKShSWwQsiMlIuNnN0EKucUiXDpn+hWFz8WRw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L/22fLgn; 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="L/22fLgn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 952C8C32786; Tue, 25 Jun 2024 15:03:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719327841; bh=18sWPiMz/2PRxXCIvtfcK7spgh5pr5ZrfaiB3z+47E4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=L/22fLgnVrCDuOa9AvI6QdbD1mU2fPLWMyOny0LJICnsPQ+OE/mai2HAC7OkLXWrJ pcjmdvOHUArp132IpQ/J7Z21Sv/jOjoC6HDAqdUKWzSDHPvfBs0pcnv8FRQWxrb3Sr FraOwe39xbpr7uXa7BJ61D/F5eof33J8kY9ZTgInPA47/sgIlBPg/f8C2pZayWI2YR nrWC+5A2Hs6TAQQZSCany+TRS3b/filwuFp/OmO63FLC5Pow0ctynPP+i3tlzxgMWn ycNQHDCO02rxEI6Wbb971VZMdfryYPFOk1DSQOosLTixKz+ahicdLElvrOaKYhN9HJ TYvGOxzLrD3vA== From: Mark Brown Date: Tue, 25 Jun 2024 15:57:56 +0100 Subject: [PATCH v9 28/39] 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: <20240625-arm64-gcs-v9-28-0f634469b8f0@kernel.org> References: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> In-Reply-To: <20240625-arm64-gcs-v9-0-0f634469b8f0@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 0.14-dev-d4707 X-Developer-Signature: v=1; a=openpgp-sha256; l=2438; i=broonie@kernel.org; h=from:subject:message-id; bh=18sWPiMz/2PRxXCIvtfcK7spgh5pr5ZrfaiB3z+47E4=; b=owGbwMvMwMWocq27KDak/QLjabUkhrSq2x0KqV3vs2a/V1Pb7Be8+t4u7WmabwqCORe9/xTgHr+8 zNa2k9GYhYGRi0FWTJFl7bOMVenhElvnP5r/CmYQKxPIFAYuTgGYiHcj+292TZ+CQLdbi9mYW8zEN2 X1LjihftFL8fvMrGl2EZzskwXMdeZ+eBMrWuqa2borvMb24hZlk386KTFbd8ltvyeVsXVOUuDr1asv 5ZQFu/QfNL7cmbnl1obSPh5WI7muxXX+i5PSXV4x/kwPf7jnbGuQWhhDb1TwV5+nwho3/2t21fw80T +/J3pniDibQTHbr237989ZsoBNX6Ly+1zl60weQQfadrmbdbHmndF47pjSx75Xe2qA22mzq809x4pu SvLH7TaZ1mPz6YWxRt70D7HrehQD3Njlrr2cmpYzdT2bxNJMr5m6ejY8x25oC3rm7/86pfBzBmdA0f namwlBHDZhJpa9tqHSxU6cK8oB 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