From nobody Tue Feb 10 19:17:08 2026 Received: from mail-pj1-f50.google.com (mail-pj1-f50.google.com [209.85.216.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 525BE22A4E8 for ; Wed, 5 Feb 2025 01:22:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.50 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738718530; cv=none; b=SB1TpKmcsH8/OIvv0lqTmPXsPVo2dT/u9XDg96MB3flSyHm/deMFMymC7fYgDBJTcCtcmDry29xjMr7dzfCACTg26bcXlo0Kzu7e0soz75JE0v9Zl4Sy51BgI9FUywWek4MNbOPe4YaBub9ga/3YAkSGsEYFtrw+VyARKgLknvQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738718530; c=relaxed/simple; bh=VGYxjWQw4QYGSfT3AnAkedt5HRuw2tlx5dJCnKUawWM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=C9SwcQ8WbVahkzQ4M1ANYysWGsqHAj8T0ivXeicQraek61zYQjwON4RYI7wxjfuHcB7Xj5wQC+AB6y6ej2nzcw37/9WKXjjaM1KwK1v93FxT6P/YP1qnJkoz5qBf/am3ZJLPbxL2g+kUZrVSEJfACGi+IXOLcpt46oXlqt+T/U4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=j1rs/SHg; arc=none smtp.client-ip=209.85.216.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="j1rs/SHg" Received: by mail-pj1-f50.google.com with SMTP id 98e67ed59e1d1-2f9c97af32eso1664742a91.2 for ; Tue, 04 Feb 2025 17:22:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1738718527; x=1739323327; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=Bi056oDr44X6mEA5ptOBWamFE29btTVHHp5F60vYQ4s=; b=j1rs/SHg28XiLfRMfuRru09SdeL6lTzWOIGLPwJy4RmpTQ8id/T0uwXZlfEAJXZlC5 RTFQf7ZqPPq8QDR00+rjd6Tk6IgLg3sEmV9xjbVdjH6jzbyPDMdvSqfOkDF+M36egZxm wh8xp+h2TwRM8zV8UN4yMU/iD8QqJPMcj67+YQvHQUh7I1b3BUHZv1H3buBnU3sm5CUy 8Xh+aX3bSolOQNuCWenMsCqMdGjwf5MYf9zhnnN1N/ZfKDSZ0TZPSU0VVOrEQVh9udRi YWT/X12LwaNNmU4/RMxCmelO9keEqqvMbsKI+AxFx5ilEiq2s+ODoCcjojxXZqIUi+LZ /scw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1738718527; x=1739323327; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Bi056oDr44X6mEA5ptOBWamFE29btTVHHp5F60vYQ4s=; b=vm0B7cRvcOB8GyBjvYfy7mJVPOinWEn9dBNo6GtSLCTDzIwVA0lDo/FSFpP6qydL/0 vvEpaE0WrxwuHde52z3o5EKCsJyBJeAW7s87xK25BTx7r5ZBn0snhHEduJ8sgjjtYhIU Sw4QAK0AaiY8B0s1kuqNpV6P4ULqzDCDJhGg18JkmZcb6G9f7IDkcVuuIpXM7v5aF9Ls S+fmVFjWpIMkTlURgudX1GDNZoq8fIAef+GNZCfzF/QFVR3vHu5JRLVvFp0R1v20G8sV a4qQXv0Hci7C5s8LaJu64jTDSdwc+1yfXhB/UcF9Li1QssF4/33LUffAp7nHGDxspnax 5hyA== X-Gm-Message-State: AOJu0YzkhDRlC3qdK0BKZot9oFpuu7yEfzpm19rkMZ/bsREaUNbG4Zbp tnhXywWWzhxZuPsLj9zGTOshEGL/74aVvCbYkfTIBWIExLNtAJl8+HNN0TBj5kg= X-Gm-Gg: ASbGncsQ7VG5eSuTtaSvsOi7FBI5PZUuirnTQ3n5t5rlhluVxhnnKAnPT788VZcz/Bq mihXO4wSORZy6E4LnQNq14wUmO8v/se5RF1lDNJ+EAPLIEl+RPRHd5Ujwx5z/Vi5j41AyxXJMji taoLuh5RPHwyWej3wG0LcANnqrR74G8u+NVUULW7VA29vwPRRk+XPpQkjW9wlDljCStaGXHLjcO Ydafy51oUyb0AkiqGHpcI48wQtl0kDOaxnBp1XTuGbd2gH/I32lLPoIVghUwJ4eqP1iIn0DCogI gJSL6Vsxd9vBKEk/bn4TNhSa4g== X-Google-Smtp-Source: AGHT+IGqNdkqdj5d5A5aA6gKpwq89EtcxR1nZ3Ul1+SB6k4syDnXtWKiLDwMtPZuQ0/gHb49XAPbWg== X-Received: by 2002:a05:6a00:1d88:b0:72f:d7ce:4ff8 with SMTP id d2e1a72fcca58-7303520d315mr1572110b3a.22.1738718527421; Tue, 04 Feb 2025 17:22:07 -0800 (PST) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-72fe69cec0fsm11457202b3a.137.2025.02.04.17.22.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Feb 2025 17:22:07 -0800 (PST) From: Deepak Gupta Date: Tue, 04 Feb 2025 17:21:54 -0800 Subject: [PATCH v9 07/26] riscv mm: manufacture shadow stack pte Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250204-v5_user_cfi_series-v9-7-b37a49c5205c@rivosinc.com> References: <20250204-v5_user_cfi_series-v9-0-b37a49c5205c@rivosinc.com> In-Reply-To: <20250204-v5_user_cfi_series-v9-0-b37a49c5205c@rivosinc.com> To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Arnd Bergmann , Christian Brauner , Peter Zijlstra , Oleg Nesterov , Eric Biederman , Kees Cook , Jonathan Corbet , Shuah Khan , Jann Horn , Conor Dooley Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, alistair.francis@wdc.com, richard.henderson@linaro.org, jim.shu@sifive.com, andybnac@gmail.com, kito.cheng@sifive.com, charlie@rivosinc.com, atishp@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, alexghiti@rivosinc.com, samitolvanen@google.com, broonie@kernel.org, rick.p.edgecombe@intel.com, Deepak Gupta X-Mailer: b4 0.14.0 This patch implements creating shadow stack pte (on riscv). Creating shadow stack PTE on riscv means that clearing RWX and then setting W=3D1. Signed-off-by: Deepak Gupta Reviewed-by: Alexandre Ghiti --- arch/riscv/include/asm/pgtable.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgta= ble.h index 8c528cd7347a..ede43185ffdf 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -421,6 +421,11 @@ static inline pte_t pte_mkwrite_novma(pte_t pte) return __pte(pte_val(pte) | _PAGE_WRITE); } =20 +static inline pte_t pte_mkwrite_shstk(pte_t pte) +{ + return __pte((pte_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE); +} + /* static inline pte_t pte_mkexec(pte_t pte) */ =20 static inline pte_t pte_mkdirty(pte_t pte) @@ -749,6 +754,11 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) return pte_pmd(pte_mkwrite_novma(pmd_pte(pmd))); } =20 +static inline pmd_t pmd_mkwrite_shstk(pmd_t pte) +{ + return __pmd((pmd_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE); +} + static inline pmd_t pmd_wrprotect(pmd_t pmd) { return pte_pmd(pte_wrprotect(pmd_pte(pmd))); --=20 2.34.1