From patchwork Tue Oct 8 22:36:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Gupta X-Patchwork-Id: 13827059 Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) (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 A48C321D184 for ; Tue, 8 Oct 2024 22:38:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728427103; cv=none; b=YMaSC4YTi02/7HMOmntyN5bFZ5luW0ooKVWaVPCYG2WScWZsRTmfT/0ZFE0G4RRXJGGWczKMvNZjU6QtqMxcusCAswIA502XbokrnyhlvgR77gBvFDqcjFyn0Dd5SdblhO3O3nC2+Ty7T6FkaPUoREvkiw5qpwFKwRfytnpl2XE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728427103; c=relaxed/simple; bh=0P0H7tyzucv3KISYxlKm6qbY67oBbop+zQ8AHryx3GY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=m4pOthceRCg11T1qYiJIBt+KZiUs1ApsmBTPXqOaJyF7AzeiNFsnsmqvM4WB6MEgDWB9lOWSzV2S1d0LeCywDmeQtahJaNNygRxriy6pXsz4UuM75vLY+w2xiyk/5WvdjYjMDkxRcBh9OAsKUp3jf7VRQieGDXRuUIXJOjzi1AY= 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=iWcgFe+P; arc=none smtp.client-ip=209.85.215.175 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="iWcgFe+P" Received: by mail-pg1-f175.google.com with SMTP id 41be03b00d2f7-7e9ff6fb4c6so4606861a12.3 for ; Tue, 08 Oct 2024 15:38:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1728427101; x=1729031901; 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=iWcgFe+PFuQUaYTwFFmlQXJIKom/Qzi8mxyZ9Ika4HvFywQw0287w1Zn1rDCedw+/u t/WLfd/l2wFeyFrytpPMOptmWn93Ue13X1Em+iVyhJGU03Mc8hMq/hUgdJhW/jQ0e2dF rUvoPbPh0bB1gUAy6yNhz7suDQ4wv1y9lbKWferDFRvhnv+bzX6KXHI0gUiXRWvkF0zd hqsoQvbZnpQ0gw0OcWpTxmSVWi/nX/DjPnp4SgTmHSi76GPrkWFQ7QgdbCJJHBBPhYTW z+WvSJdl8DxMgFIW4+tB6mNDQLMHsz2xhRDmEuQVyK2FunegtcsWk19P3keB/l8bmZ2D AoHA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728427101; x=1729031901; 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=qHHtoxfhlguPJRwKmurxq61VQNcK+8tLGbmdMCz0feExJ2D218BqU7XtMikSXMrRw1 1h0/F94aRRtIThMXsAjEX6UhQPm7HdNo2Oz+M7QugqyM3HqW1oamIF9qUcnuuNO/fOD+ ppaNsLDC1zTAEhgPedtoDdeFJYs/HyHSK2LAixoQJw0/GU0l0liXMN/g0U/ytExVpOig zs5pQ9a62JiCznL00a2/fs8n76Mz+7wj4p4+bp2fxJ+jNQblt+dnNFfNjF+dKFuSVaPU wYhy/Ujk3LN+TN50eX7DDIzsNcTbiQBQKadqimbuMLgb99MQCqRFYVFubVSwSYH2QACr e2wQ== X-Forwarded-Encrypted: i=1; AJvYcCWqeWZOovLNdgVkuBw04Zq7HKnRrWC2t0NG/CQNxtxrhSUuGRhM2tKga1CE2OaHpymiDPissyRofZjzRui0@vger.kernel.org X-Gm-Message-State: AOJu0YyVYBp/RpZYmNpUXazhFdyjS3EpgxbcVs1AQNv2Wm9tDjLmXWGx khhbkFl1B27a0NcAR/JgH2u8mIX6fGaxPot3PAK0kQH8pLVBhOQ/s7MCWZLNpzU= X-Google-Smtp-Source: AGHT+IHvesfHqSkO6ZkkqxS8iUZFbPtASty24Hzhh3e/eaCzge7K6ZuvofdLUxv7u/b5HvamsjHRPQ== X-Received: by 2002:a05:6a21:6f83:b0:1d0:7df8:2484 with SMTP id adf61e73a8af0-1d8a3cd928amr676575637.43.1728427101109; Tue, 08 Oct 2024 15:38:21 -0700 (PDT) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71df0ccc4b2sm6591270b3a.45.2024.10.08.15.38.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2024 15:38:20 -0700 (PDT) From: Deepak Gupta Date: Tue, 08 Oct 2024 15:36:54 -0700 Subject: [PATCH v6 12/33] riscv mm: manufacture shadow stack pte Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241008-v5_user_cfi_series-v6-12-60d9fe073f37@rivosinc.com> References: <20241008-v5_user_cfi_series-v6-0-60d9fe073f37@rivosinc.com> In-Reply-To: <20241008-v5_user_cfi_series-v6-0-60d9fe073f37@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=1. 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/pgtable.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); } +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) @@ -738,6 +743,11 @@ 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)));