From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (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 80A4D6669B for ; Fri, 29 Sep 2023 21:11:59 +0000 (UTC) Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-59c09bcf078so265601367b3.1 for ; Fri, 29 Sep 2023 14:11:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1696021918; x=1696626718; darn=lists.linux.dev; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=qI6+evphp8TRNLDsXrgWEBj/E5cavHWN+P8xd8/8MDM=; b=Oczj/ONIDPL7RwXKBv3lZDq/kmkvvfhLb3tcDRR45rflcyMUweOFYhrjAz3YYWP9IB 9gozgjJmgTxHjqN+DHuSVGkznUCK2NhIclTmwWRFzBlYWCni08lkAW/tvxQEzIA2SvYt qaXA/XzpO6EGP6F7KJ+vtVHu9c2QIIr6cvPoV5RAY7Eah11jviXWS6KPwkddo4xcDrqA 6qEZlCFelGMFuidNApy21n54UqfjzyGGAhnYDhO33Xqjj1CmD9Q2kaTUBD8uMhSCIkx7 TWSilbdotAzRxYtUwTX8EaaDfSNZAkfIK86JAKtWi+CqLv6woiBF2OMu1+TT5SX3M5ki lMLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696021918; x=1696626718; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=qI6+evphp8TRNLDsXrgWEBj/E5cavHWN+P8xd8/8MDM=; b=SW1lyNfMnFbh3VzjMewM3J1/SdifU78JymI4nMV6DxgHX754rk3pbRhyCCu5QOPGnx 4+ycUnTGSmzIaBV1PkrB+Y+U6USur17HwOzbGuK/329cfTSg5h3KhqkU+2llk+fQSjBJ 1+eNqwzbbhqVtznVsIGv4lPrLgrFXOjtNzFEK0HJ3S8g01FwtMcCDgD5HvZ+hRMYyeuZ lSnSuMkdnW8dh1U+1cDrpIL4KSCK1SAlERH6N1TsRFZi9zKx8uYFR0zBoTwl0BxuSQxW gUIPDIT9P37G7Kkg6pUuk2BukJqHGOr08O8rwMFtGAzYYV9KmfuTILEKSwgm55y53a9e H4Vg== X-Gm-Message-State: AOJu0YxW5Kea+s+QxRU9dtVa//CvDftPeNVXZMi19N+5VmUs8uEMC6eG xYxQrai2g0ICsqPb62lQiRtYIYwuP7W6ux9A6ZY= X-Google-Smtp-Source: AGHT+IGjD5ILJnbbyCB0lpaKNSDkrgUS5mwaokgtSD8CjgjpWZhKS+xQi/ZyvDLcSGZs4gGR5Nixr3sWaAppp9HPVPc= X-Received: from samitolvanen.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:4f92]) (user=samitolvanen job=sendgmr) by 2002:a25:ad0a:0:b0:d7b:8d0c:43f0 with SMTP id y10-20020a25ad0a000000b00d7b8d0c43f0mr85777ybi.11.1696021918263; Fri, 29 Sep 2023 14:11:58 -0700 (PDT) Date: Fri, 29 Sep 2023 21:11:56 +0000 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Developer-Key: i=samitolvanen@google.com; a=openpgp; fpr=35CCFB63B283D6D3AEB783944CB5F6848BBC56EE X-Developer-Signature: v=1; a=openpgp-sha256; l=727; i=samitolvanen@google.com; h=from:subject; bh=Ko6nN36PGlYW1laUEIPPBze9YPFWfBooBOFzOjRaBRQ=; b=owEB7QES/pANAwAKAUy19oSLvFbuAcsmYgBlFz2b825e14pVS6UiwTyLbmjRM7MleUeCEvyhI HQ9Yi7cABWJAbMEAAEKAB0WIQQ1zPtjsoPW0663g5RMtfaEi7xW7gUCZRc9mwAKCRBMtfaEi7xW 7p9uC/9v8/6JNqB5Fbep/hRFQKiCO/kScjQBMmlHvInQfP3gwUfbFCkkKYSVRSOR4Pxeo+/um1b AFvQRu8TawGoy7GtfAlC2T/3RZQcj6xNwU/+K5WHsVdfqZNa6xsNhtBstdrsW91ELm7X4wBhnPs 9dYkZsrMXL8JtJvTDL1VQ3EjQ/tTab3SiJiqIF2J694+4vXbP83KGUAsC8z11QRsfCkb9V0cHNb qMaWfvoF2E3/MtrWUF/VlddoLs+4VfwsIz2eTQZm1X5Ll3CAeOMw8TmTQqQ3OT2OM1kJ1GKFGjs kpo/58zC+ziTSyL0rCbs4jrdHHMyEYwJ50108kvKlUuWGKE1joh0omULdtzfezNnIwzMPwuVnD+ 4eCKnZSAXhZxbKFAC20jcgErpJusDmn0lx2CNHUYsVuPL58GkYaK49lTYq09WuoCRWjrP+iv4BO 5JlmAMEmM6FrNg93Mj3ALgwQi7uUk7LHPkg8Rs7a3cO1p1MoInq21V6B5zk6DfXYcBSdA= X-Mailer: git-send-email 2.42.0.582.g8ccd20d70d-goog Message-ID: <20230929211155.3910949-4-samitolvanen@google.com> Subject: [PATCH 0/2] riscv: Increase mmap_rnd_bits_max on Sv48/57 From: Sami Tolvanen To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Andrew Morton , Kees Cook Cc: linux-mm@kvack.org, linux-riscv@lists.infradead.org, llvm@lists.linux.dev, linux-kernel@vger.kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Hi all, We noticed that 64-bit RISC-V kernels limit mmap_rnd_bits to 24 even if the hardware supports a larger virtual address space size [1]. These two patches allow mmap_rnd_bits_max to be changed during init, and bumps up the maximum randomness if we end up setting up 4/5-level paging at boot. Sami [1] https://github.com/google/android-riscv64/issues/1 Sami Tolvanen (2): mm: Change mmap_rnd_bits_max to __ro_after_init riscv: mm: Update mmap_rnd_bits_max arch/riscv/mm/init.c | 6 ++++++ include/linux/mm.h | 2 +- mm/mmap.c | 2 +- 3 files changed, 8 insertions(+), 2 deletions(-) base-commit: 6465e260f48790807eef06b583b38ca9789b6072 -- 2.42.0.582.g8ccd20d70d-goog