Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751278AbdIOK5q (ORCPT ); Fri, 15 Sep 2017 06:57:46 -0400 Received: from mail-pg0-f43.google.com ([74.125.83.43]:45440 "EHLO mail-pg0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751157AbdIOK5o (ORCPT ); Fri, 15 Sep 2017 06:57:44 -0400 X-Google-Smtp-Source: ADKCNb76z8mkjUy0bSxf2hZ5fhuz+vo/loaM/wNpztiY746CBurRY70tLnl2NybGDv7M1vHNR9GtIA== From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, bauerman@linux.vnet.ibm.com, dhowells@redhat.com, vgoyal@redhat.com, herbert@gondor.apana.org.au, davem@davemloft.net, akpm@linux-foundation.org, mpe@ellerman.id.au, dyoung@redhat.com, bhe@redhat.com, arnd@arndb.de, ard.biesheuvel@linaro.org Cc: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro Subject: [PATCH v3 00/10] arm64: kexec: add kexec_file_load() support Date: Fri, 15 Sep 2017 19:59:22 +0900 Message-Id: <20170915105932.25338-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.14.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4972 Lines: 113 This is the third round of implementing kexec_file_load() support on arm64.[1] Most of the code is based on kexec-tools (along with some kernel code from x86, which also came from kexec-tools). This patch series enables us to * load the kernel, Image, with kexec_file_load system call, and * optionally verify its signature at load time for trusted boot. To load the kernel via kexec_file_load system call, a small change is also needed to kexec-tools. See [2]. This enables '-s' option. As we discussed a long time ago, users may not be allowed to specify device-tree file of the 2nd kernel explicitly with kexec-tools, hence re-using the blob of the first kernel. Regarding a signing method, we conform with x86 (or rather Microsoft?) style of signing since the binary can also be seen as in PE format (assuming that CONFIG_EFI is enabled). Powerpc is also going to support extended-file-attribute-based verification[3] with vmlinux, but arm64 doesn't for now partly because we don't have TPM-based IMA at this moment. Accordingly, we can use the existing command, sbsign, to sign the kernel. $ sbsign --key ${KEY} --cert ${CERT} Image Please note that it is totally up to the system what key/certificate is used for signing, but one of easy ways to *try* this feature is to turn on CONFIG_MODULE_SIG so that we can reuse certs/signing_key.pem as a signing key, KEY and CERT above, for kernel. (This also enables CONFIG_CRYPTO_SHA1 by default.) Some concerns(or future works): * Even if the kernel is configured with CONFIG_RANDOMIZE_BASE, the 2nd kernel won't be placed at a randomized address. We will have to add some boot code similar to efi-stub to implement the feature. * While big-endian kernel can support kernel signing, I'm not sure that Image can be recognized as in PE format because x86 standard only defines little-endian-based format. * IMA(and extended file attribute)-based kexec * vmlinux support [1] http://git.linaro.org/people/takahiro.akashi/linux-aarch64.git branch:arm64/kexec_file [2] http://git.linaro.org/people/takahiro.akashi/kexec-tools.git branch:arm64/kexec_file [3] http://lkml.iu.edu//hypermail/linux/kernel/1707.0/03669.html Changes in v3 (Sep 15, 2017) * fix kbuild test error * factor out arch_kexec_kernel_*() & arch_kimage_file_post_load_cleanup() * remove CONFIG_CRASH_CORE guard from kexec_file.c * add vmapped kernel region to vmcore for gdb backtracing (see prepare_elf64_headers()) * merge asm/kexec_file.h into asm/kexec.h * and some cleanups Changes in v2 (Sep 8, 2017) * move core-header-related functions from crash_core.c to kexec_file.c * drop hash-check code from purgatory * modify purgatory asm to remove arch_kexec_apply_relocations_add() * drop older kernel support * drop vmlinux support (at least, for this series) Patch #1 to #5 are all preparatory patches on generic side. Patch #6 is purgatory code. Patch #7 to #9 are common for enabling kexec_file_load. Patch #10 is for 'Image' support. AKASHI Takahiro (10): include: pe.h: remove message[] from mz header definition resource: add walk_system_ram_res_rev() kexec_file: factor out arch_kexec_kernel_*() from x86, powerpc kexec_file: factor out crashdump elf header function from x86 asm-generic: add kexec_file_load system call to unistd.h arm64: kexec_file: create purgatory arm64: kexec_file: load initrd, device-tree and purgatory segments arm64: kexec_file: set up for crash dump adding elf core header arm64: enable KEXEC_FILE config arm64: kexec_file: add Image format support arch/arm64/Kconfig | 29 +++ arch/arm64/Makefile | 1 + arch/arm64/include/asm/kexec.h | 93 +++++++ arch/arm64/kernel/Makefile | 4 +- arch/arm64/kernel/kexec_image.c | 105 ++++++++ arch/arm64/kernel/machine_kexec_file.c | 365 ++++++++++++++++++++++++++++ arch/arm64/purgatory/Makefile | 24 ++ arch/arm64/purgatory/entry.S | 55 +++++ arch/powerpc/include/asm/kexec.h | 4 + arch/powerpc/kernel/machine_kexec_file_64.c | 36 +-- arch/x86/kernel/crash.c | 324 ------------------------ arch/x86/kernel/machine_kexec_64.c | 59 +---- include/linux/ioport.h | 3 + include/linux/kexec.h | 43 +++- include/linux/pe.h | 2 +- include/uapi/asm-generic/unistd.h | 4 +- kernel/kexec_file.c | 360 ++++++++++++++++++++++++++- kernel/kexec_internal.h | 20 ++ kernel/resource.c | 59 +++++ 19 files changed, 1156 insertions(+), 434 deletions(-) create mode 100644 arch/arm64/kernel/kexec_image.c create mode 100644 arch/arm64/kernel/machine_kexec_file.c create mode 100644 arch/arm64/purgatory/Makefile create mode 100644 arch/arm64/purgatory/entry.S -- 2.14.1