From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A85CCD339BB for ; Fri, 5 Dec 2025 18:42:09 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3BACD6B0283; Fri, 5 Dec 2025 13:41:57 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 36B276B0285; Fri, 5 Dec 2025 13:41:57 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1E5C66B0286; Fri, 5 Dec 2025 13:41:57 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 07E336B0283 for ; Fri, 5 Dec 2025 13:41:57 -0500 (EST) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id D268413A43D for ; Fri, 5 Dec 2025 18:41:56 +0000 (UTC) X-FDA: 84186286632.05.9BFF845 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf17.hostedemail.com (Postfix) with ESMTP id BF2874000B for ; Fri, 5 Dec 2025 18:41:54 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=S6M5ZvQh; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of devnull+debug.rivosinc.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+debug.rivosinc.com@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1764960114; h=from:from:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=mHzBUgfJ0WOwFwyblJV2skqbFPZG1hANPnZUguzLKzs=; b=puk1U7coRMxr6++Nh6O9ZjbboXym/SDusmuLbDaJ+cZaRAWK/lmFblu8xbB7wgHoK64yJU AumbvrCraMl5yLrYVjOd3yUC32uqpkhOIxo4c/IBE9k98FNv/zxC/WZ0dFFmlLe1VBLMEo Uq4fqsZnJ4AJ2o+1qp+meCt35Q2f3uY= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=S6M5ZvQh; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of devnull+debug.rivosinc.com@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=devnull+debug.rivosinc.com@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1764960114; a=rsa-sha256; cv=none; b=IQDEAoAYg8UM0qNlMhdZ2r8GLOKe7BhO20mtE4MFhC+mAkuXgFB6waZQps0gVDStlbc3ES Nm4g02zK4Rp/NDTipTe+9tZDhlomEq8ugvHkamBp/9y2N78bsfTQUgoMufcfvCnKPBYGpU CpzDb+FO+pOqO6xhl7xQNFCv6L4WoeI= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id C502844509; Fri, 5 Dec 2025 18:41:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 8963FC4AF1B; Fri, 5 Dec 2025 18:41:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764960110; bh=LAJf90nF+g60beJiG5QYxHSIluys/8oDXRemvNQeYOw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=S6M5ZvQhqvVD5F0QS2ZsaZqG9/Ff5CHSPgQYbRJ23AOcs62IDM8EZVU568dQOzSkt dhiL2Vg39hqQp9mGZhr21Mn5+gr39BQVBtVELnstCb2utX1rYE+k3IsrUUrnvTI6n0 CaoWiTREC7hvqdxcV1QvqEw/Sk2ROdORtByyQJk+J4Rv68dGEiMMaIytRVUwQlyOZM /nJSderYf+Ueu8aUTw2bNmLtDyBp8AKClEvxQAAw9Ez/GwxOV51oktQysEW2I5EKXd u0vgDMnGr+iNevHiAzwdOILAevpdFcbQKd15Z/c21W9JUPCm+WZpPx2yh8g3SRuzFA y3XbLxCjo5XeA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76CA4D2F7F6; Fri, 5 Dec 2025 18:41:50 +0000 (UTC) From: Deepak Gupta via B4 Relay Date: Fri, 05 Dec 2025 10:41:45 -0800 Subject: [PATCH v25 07/28] riscv/mm: manufacture shadow stack pte MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251205-v5_user_cfi_series-v25-7-1a07c0127361@rivosinc.com> References: <20251205-v5_user_cfi_series-v25-0-1a07c0127361@rivosinc.com> In-Reply-To: <20251205-v5_user_cfi_series-v25-0-1a07c0127361@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 , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Benno Lossin 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, rust-for-linux@vger.kernel.org, Zong Li , Andreas Korb , Valentin Haudiquet , Deepak Gupta X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1764960107; l=1430; i=debug@rivosinc.com; s=20251023; h=from:subject:message-id; bh=xg60sqaex1DpMRqlc6kxZaEeka4CnULn8wlCIX4f9Wk=; b=FeUvykLJrfx/Bx62YVwLSBRd4tiOMI1wQodP4x5CTmbkL5Ei2JxUy9gzi6n8H67+hQBt/aKLb vRuIFYVQ7I6DPsrGaXuPK9GKzxZw3Ry38RV+cpNV9qneCbZdDnsoUhr X-Developer-Key: i=debug@rivosinc.com; a=ed25519; pk=O37GQv1thBhZToXyQKdecPDhtWVbEDRQ0RIndijvpjk= X-Endpoint-Received: by B4 Relay for debug@rivosinc.com/20251023 with auth_id=553 X-Original-From: Deepak Gupta Reply-To: debug@rivosinc.com X-Rspam-User: X-Stat-Signature: 8wquguz5t93yujyijomow1zbkbswhn5m X-Rspamd-Queue-Id: BF2874000B X-Rspamd-Server: rspam06 X-HE-Tag: 1764960114-895492 X-HE-Meta: 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 SevVE2m3 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Deepak Gupta This patch implements creating shadow stack pte (on riscv). Creating shadow stack PTE on riscv means that clearing RWX and then setting W=1. Reviewed-by: Alexandre Ghiti Reviewed-by: Zong Li Tested-by: Andreas Korb Tested-by: Valentin Haudiquet Signed-off-by: Deepak Gupta --- 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/pgtable.h index 4c4057a2550e..e4eb4657e1b6 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -425,6 +425,11 @@ static inline pte_t pte_mkwrite_novma(pte_t pte) return __pte(pte_val(pte) | _PAGE_WRITE); } +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) */ static inline pte_t pte_mkdirty(pte_t pte) @@ -765,6 +770,11 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) return pte_pmd(pte_mkwrite_novma(pmd_pte(pmd))); } +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))); -- 2.43.0