From nobody Sat Nov 23 19:42:26 2024 Received: from mail-pg1-f178.google.com (mail-pg1-f178.google.com [209.85.215.178]) (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 9A0BF1C8FA2 for ; Mon, 11 Nov 2024 20:54:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.178 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731358458; cv=none; b=KXaaAcQwNaPwix4VsY51neKBe58F6tWjzdhgtcycPHdRuSGxC4gN3SMLZRaV8sOmjMjbSE+HETxY9Uj2jYTc0P1aehSY6O5CueJnCQ5yTRKoLlfG4DyaxXvfkrhiVXCD1TQYGY1N66ECGuNIRJLXJo+qfBPYzfZkLrgCcUoQGHA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731358458; c=relaxed/simple; bh=0P0H7tyzucv3KISYxlKm6qbY67oBbop+zQ8AHryx3GY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Bb+GDGGTJV8zgPqo7LysF1j1tykL9BYYMWssHUTVweVVYlFx1sILCXaapYKmfM4jn3cGSt7gXts7qlbzV1jGCz0oQmo+JNrjj/VXjwdPUgt4JBHXQAf31IJYNBMTYgLrFj3POPmViwstDWCB3Ua6mLj927S6JbCvaoH23R6ETzg= 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=JaxSSnwl; arc=none smtp.client-ip=209.85.215.178 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="JaxSSnwl" Received: by mail-pg1-f178.google.com with SMTP id 41be03b00d2f7-7f45ab88e7fso1007497a12.1 for ; Mon, 11 Nov 2024 12:54:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1731358456; x=1731963256; 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=HvFaRabdOYgj/FaUxHA5lpjBxuSoaWHPSkkVGjDU8NY=; b=JaxSSnwlJo/lD+GLDEPBjlQiYpwI6rvV3podhdIoUtzPPG+luaffpVraQ2Ijcvy279 kczovEp64cV2xODa15yZDhftj33/1S4dChlftzT/C14qpyyIo7vsWeF/KY+FVvhv+VCV O2dTOG6liLHdLc9V56UTx6x4Bt7ZVFxef59gH479RWZjDiOqgbY56dt+yN5sLp7/VCks m7mMiF7ZKCkqjpUfinyn2Kgox5Lz+Us4dWfsTb5STBKYgFF48M2gtSZS/xE91wOl00QD Diym4DNOILfAL6sEqYK5vn+iD528Kkq8KQep9cYxzsjuAkb/3/GI0Gdc8jpo3shTtaN+ c5TA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731358456; x=1731963256; 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=HvFaRabdOYgj/FaUxHA5lpjBxuSoaWHPSkkVGjDU8NY=; b=XaNIucsXFSFKXTNS+2cKoH0UTK4Kn/zD2GJzHSwg4zF9HGzVbYCoy2q3tbwIvbC6Vu SBYTZ/k0dCFpGoL94v4QwHXk7776oqC3E8RcMSEN2QfRctc195Ac9ATrxafM8gdEqbxr scvZEmLzsQrjmTnL0JZ7O/1pIUwhmf53f0WWRB9tI54jdspDK/FDYsdNogdcXKznPVhV lq7I2qeirKkshhOGhGkIHMQYsGoYNEV40ZR2qj+dRy8/mAlVDLi8ehMbCLqRMS8uKXS0 gjwj9wePdkSetMNyD2vNzavI/xMya4Pxx5eRh2QOpyWIRTzYeSAcBml3F6dy9tLcYcZM +C/w== X-Gm-Message-State: AOJu0YzhLLwRV8cPo1XfDub6bYTH3Inoy7bnNFSyIy/pYqhtWInaANfc R5DQo9BK5U37AK4+Cx9Jr2ijoiG0+354Y+jkVq0pN7pyxer0m5dA9BvRxfkY7aE= X-Google-Smtp-Source: AGHT+IHkeWur3sgROxcRoGTFfP+xBQFc9m8RxiHforXzu5iQMPat3nHq0j8ICMSCMJgsQveJpQW4TA== X-Received: by 2002:a17:90b:4acb:b0:2e2:af53:9326 with SMTP id 98e67ed59e1d1-2e9b177fc76mr19427178a91.30.1731358455997; Mon, 11 Nov 2024 12:54:15 -0800 (PST) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e9a5fd1534sm9059974a91.42.2024.11.11.12.54.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Nov 2024 12:54:15 -0800 (PST) From: Deepak Gupta Date: Mon, 11 Nov 2024 12:53:53 -0800 Subject: [PATCH v8 08/29] 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: <20241111-v5_user_cfi_series-v8-8-dce14aa30207@rivosinc.com> References: <20241111-v5_user_cfi_series-v8-0-dce14aa30207@rivosinc.com> In-Reply-To: <20241111-v5_user_cfi_series-v8-0-dce14aa30207@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 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 4948a1f18ae8..2c6edc8d04a3 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) @@ -738,6 +743,11 @@ 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 2.45.0