From patchwork Thu Jul 13 13:33:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandre Ghiti X-Patchwork-Id: 702508 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8865CC0015E for ; Thu, 13 Jul 2023 13:34:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234813AbjGMNeK (ORCPT ); Thu, 13 Jul 2023 09:34:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37616 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234650AbjGMNeK (ORCPT ); Thu, 13 Jul 2023 09:34:10 -0400 Received: from mail-ej1-x62a.google.com (mail-ej1-x62a.google.com [IPv6:2a00:1450:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E2061FEA for ; Thu, 13 Jul 2023 06:34:06 -0700 (PDT) Received: by mail-ej1-x62a.google.com with SMTP id a640c23a62f3a-991fe70f21bso117700266b.3 for ; Thu, 13 Jul 2023 06:34:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1689255244; x=1691847244; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Lni4UWIKw2Lp7DjCo96CHQnoSYyoodWrf2lKDIVVpbc=; b=BcfyuInp5jBxZzTvOSoWtOTxgq4kzMeUaI/Vi3ghXwRdt6V7XMYOeMvXYPrMT9YvpI wtpSuYNpSjbpK8KC8M+N8XpCKV1KC4XbB9FkTa4vZE6VbRQtGHzZjviZG43Lj9wCCpkZ J1HyRhUQU9dd9GeN50S3jHRYETSB8CavwaQuYkvTL4j+TXu9fqX0n6eoLpRFlrMWGcka 3FkxTV6FIJDOzP8WqiFhgb6rguKq7veV5jLgnmAMOxaPMfeeTSbzQVlAy9jVNSBsfbiW bG3uLd7oErowpMqS69XE+Hd5ZYS+WcCsjr3P6wFlfFkg7s25zKhLVTg1RG5lf9VnjH5C S8Xw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689255244; x=1691847244; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Lni4UWIKw2Lp7DjCo96CHQnoSYyoodWrf2lKDIVVpbc=; b=kWrTnWi5u3mY4KZtOr1CGUT5BogejgD5QYPtSIvQ3q32/lJ0pvXcDuo6k7bbMJ2nLx d4E/bYuLdRR+8HGdHa3ZPnrZcbDgwd5g5ui69pItvt11N5Lfj3k0keBGCq5GIHBwa0/K MsoY93mtM5ewWu66ojpCG0lNvKmyNXW712ms5SJRxsdns7NRCwGEG10+hGH7rTqfeduG Gi8tGiCCZ+irTUwJh0FqKBhLCVHteK1HLV+AvVMejT5jn5tmkB4gfCPdK3mu+f4vuMwP o4+viRo2mYcAHIcGa+qiBUR/MlIZLejnms9zp8r5iqE/5t6++gRHuirtL/MgsC6QVJ01 Nejg== X-Gm-Message-State: ABy/qLbqx3BFD+Sn08z36QfhkoB71zYr6LP+6D9bxceYfXAsVnX2X0qO bHrLoGQSJPp9rmwZNm1gCh5unFoL1HWlApaKzQM= X-Google-Smtp-Source: APBJJlGvrRWNt/FFlKe8uKPn1T37JqQamvuvd1xh9hAZXGrxTN6z2+pvgee7FNyh0NbM/6xJ+VJhvQ== X-Received: by 2002:a17:906:20a:b0:982:487c:7508 with SMTP id 10-20020a170906020a00b00982487c7508mr1634168ejd.38.1689255244554; Thu, 13 Jul 2023 06:34:04 -0700 (PDT) Received: from alex-rivos.ba.rivosinc.com ([93.23.19.53]) by smtp.gmail.com with ESMTPSA id d15-20020a170906c20f00b00993017b64a8sm3982733ejz.224.2023.07.13.06.34.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 06:34:04 -0700 (PDT) From: Alexandre Ghiti To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Ard Biesheuvel , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Alexandre Ghiti Subject: [PATCH v4 0/5] riscv: Introduce KASLR Date: Thu, 13 Jul 2023 15:33:56 +0200 Message-Id: <20230713133401.116506-1-alexghiti@rivosinc.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org The following KASLR implementation allows to randomize the kernel mapping: - virtually: we expect the bootloader to provide a seed in the device-tree - physically: only implemented in the EFI stub, it relies on the firmware to provide a seed using EFI_RNG_PROTOCOL. arm64 has a similar implementation hence the patch 3 factorizes KASLR related functions for riscv to take advantage. The new virtual kernel location is limited by the early page table that only has one PUD and with the PMD alignment constraint, the kernel can only take < 512 positions. base-commit-tag: v6.5-rc1 Changes in v4: * Fix efi_get_kimg macro that returned nothing * Moved new kaslr functions into their own files to avoid zboot link failures, as suggested by Ard Changes in v3: * Rebase on top of 6.4-rc2 * Make RANDOMIZE_BASE depend on 64bit * Fix efi_icache_sync and efi_get_kimg_min_align which were undefined in x86 (and certainly other archs) * Add patch 4 to fix warning on rv32 Changes in v2: * Rebase on top of 6.3-rc1 * Add a riscv cache sync after memcpying the kernel * Add kaslr_offset implementation for KCOV * Add forward declaration to quiet LLVM Alexandre Ghiti (5): riscv: Introduce virtual kernel mapping KASLR riscv: Dump out kernel offset information on panic arm64: libstub: Move KASLR handling functions to efi-stub-helper.c libstub: Fix compilation warning for rv32 riscv: libstub: Implement KASLR by using generic functions arch/arm64/include/asm/efi.h | 4 + arch/riscv/Kconfig | 19 +++ arch/riscv/include/asm/efi.h | 4 + arch/riscv/include/asm/page.h | 3 + arch/riscv/kernel/image-vars.h | 1 + arch/riscv/kernel/pi/Makefile | 2 +- arch/riscv/kernel/pi/cmdline_early.c | 13 ++ arch/riscv/kernel/pi/fdt_early.c | 30 ++++ arch/riscv/kernel/setup.c | 25 +++ arch/riscv/mm/init.c | 36 +++- drivers/firmware/efi/libstub/Makefile | 3 +- drivers/firmware/efi/libstub/arm64-stub.c | 117 ++----------- drivers/firmware/efi/libstub/efi-stub-kaslr.c | 159 ++++++++++++++++++ drivers/firmware/efi/libstub/efistub.h | 18 ++ drivers/firmware/efi/libstub/riscv-stub.c | 33 ++-- 15 files changed, 342 insertions(+), 125 deletions(-) create mode 100644 arch/riscv/kernel/pi/fdt_early.c create mode 100644 drivers/firmware/efi/libstub/efi-stub-kaslr.c