From nobody Thu Nov 28 15:57:06 2024 Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) (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 A24171CEAB8 for ; Tue, 1 Oct 2024 16:07:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727798854; cv=none; b=uN1ERZ6xugrosDKbHRkL6Si/Kx5ogZKUTwehAMFVeZ2wNE393W9YdxLVRXszrfX0EGmn8+rJYsKdtfpTfxTtjRiUQ/P6hO1i7yW0lJTSATXGnGAziCEDmuIIgK4bE1isOmUnrllu4AqJAPbTEnQTXpdLBT2uuJCkn4hG6Hdfh5A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727798854; c=relaxed/simple; bh=0P0H7tyzucv3KISYxlKm6qbY67oBbop+zQ8AHryx3GY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=eTgqm8jRt6GrCz+EYnHSVgNZMtKPg0NJJZcsv96lhQkjE1aAYVffcmZRhZdMATmhLJHcGtZuOF+bMM5X28QraWxFx/BPUb4xbFq8UPgJ7tkRqlB5wDs9uHC7bXO7+6m2Me6fvtXfV0ip8ubSuM3C45oFefOF7dPFRc55UfUhAhk= 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=R3G2S/uv; arc=none smtp.client-ip=209.85.216.52 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="R3G2S/uv" Received: by mail-pj1-f52.google.com with SMTP id 98e67ed59e1d1-2e0a060f6e8so3908927a91.1 for ; Tue, 01 Oct 2024 09:07:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1727798853; x=1728403653; 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=R3G2S/uvOFDZBl5pLDC+WWBYGEfPbFhi1qD4GiaxGCxeGAmVgPU9t4cBQi50L1n5qR iQH0hheTLRXU6hjf+UrnY85FsKzz9Ar46gplx/PmFXZeTit0Z4cvZ/jZPKqZBSUuL+Ep 6AOCg4gRYPPh8Aca4BojOunksW7mp+iJa0EAVVapSQwpzH3hHgEUlRbOsRvdoYnh+sz8 cmw7Ot8QCovLNyLxSa8+UzogNZa68QVOjACr53BsR9N1rkBptUWCheABDV5ESYMr1KGK Gu2RlmYR7NUvUJob6pvhWH9G7ZfhIvjSy5eq9QLaZEpRisBYdB1eBOQdiiYVB7JHdRaH M8iw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727798853; x=1728403653; 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=Aj00U8/4GzBOOJwwIMxnFa0wz6b0rcpg9hJujoam9FMdO4X9RXUCQ+u/Sy3GhviuZF 0ck3JcuMHE+pbEb9giRMHC5+LqQoKhDaxNEmTGFKW/CYg3jrcnGy3Eikcjs+1/vWpmbh u8Ix01i8ycye1lG9PMsqo8Xm2IRIp4THfRyUailqAPujvuENJpOlgVD74/dkKw90EAYo mXOHlcg1d0+hTwtZQSGf5wK9hiEtF5nV2XCzUXJCLTAsJGRREmbjVjhox3V9EJVMTkZW IdRRzdP1Az8oxvpcBpM/jS0KWJHEVkfWYNVNpZOuED0ZS+Kaf6JJEmo7dgvQ28HZOzI2 hdjQ== X-Gm-Message-State: AOJu0Yw/jDCa9q3kfzU+/kAhrjzSZklyeBIHs+w66TsTZC3H66ZZXdM2 LXTuFj4HZLAMOTNlJCXEnYmt2l3NwH1YBqobEq3OUtXZeDDxjd7Wc5Yahtqek/U= X-Google-Smtp-Source: AGHT+IG9catzJvE6iZhMcet9lnrBEGB4mWrgVfEl6Aw7Bwjo8k2vC5A57va5s4Xp67KUnf9ZyIG6qQ== X-Received: by 2002:a17:90a:ba88:b0:2e0:f81c:731f with SMTP id 98e67ed59e1d1-2e18481a282mr222726a91.24.1727798852879; Tue, 01 Oct 2024 09:07:32 -0700 (PDT) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e06e1d7d47sm13843973a91.28.2024.10.01.09.07.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Oct 2024 09:07:32 -0700 (PDT) From: Deepak Gupta Date: Tue, 01 Oct 2024 09:06:17 -0700 Subject: [PATCH 12/33] 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: <20241001-v5_user_cfi_series-v1-12-3ba65b6e550f@rivosinc.com> References: <20241001-v5_user_cfi_series-v1-0-3ba65b6e550f@rivosinc.com> In-Reply-To: <20241001-v5_user_cfi_series-v1-0-3ba65b6e550f@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