Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752023AbdCXRe5 (ORCPT ); Fri, 24 Mar 2017 13:34:57 -0400 Received: from thoth.sbs.de ([192.35.17.2]:42551 "EHLO thoth.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750767AbdCXRed (ORCPT ); Fri, 24 Mar 2017 13:34:33 -0400 From: Jan Kiszka To: Matt Fleming , Ard Biesheuvel Cc: linux-efi@vger.kernel.org, Linux Kernel Mailing List , Andy Shevchenko , "Bryan O'Donoghue" , Hock Leong Kweh , Borislav Petkov , Sascha Weisenberger Subject: [PATCH v2 5/7] efi/capsule: Prepare for loading images with security header Date: Fri, 24 Mar 2017 18:34:18 +0100 Message-Id: <47e87c8eccc0ee5c4033ece037c0bffc32782876.1490376860.git.jan.kiszka@siemens.com> X-Mailer: git-send-email 2.10.2 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4759 Lines: 134 The Quark security header is nicely located in front of the capsule image, but we still need to pass the image to the update service as if there was none. Prepare efi_capsule_update and its user for this by defining and evaluating a EFI header displacement in the image located in memory. For standard-conforming capsules, this displacement is 0. Signed-off-by: Jan Kiszka --- drivers/firmware/efi/capsule-loader.c | 19 +++++++++++++------ drivers/firmware/efi/capsule.c | 21 +++++++++++++++++---- include/linux/efi.h | 1 + 3 files changed, 31 insertions(+), 10 deletions(-) diff --git a/drivers/firmware/efi/capsule-loader.c b/drivers/firmware/efi/capsule-loader.c index 37d3f6e..59e2694 100644 --- a/drivers/firmware/efi/capsule-loader.c +++ b/drivers/firmware/efi/capsule-loader.c @@ -26,6 +26,7 @@ struct capsule_info { long index; size_t count; size_t total_size; + unsigned int efi_hdr_displacement; struct page **pages; size_t page_bytes_remain; }; @@ -83,6 +84,8 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info, return ret; } + cap_info->efi_hdr_displacement = 0; + cap_info->total_size = cap_hdr->imagesize; temp_page = krealloc(cap_info->pages, pages_needed * sizeof(void *), @@ -103,16 +106,20 @@ static int efi_capsule_setup_info(struct capsule_info *cap_info, **/ static ssize_t efi_capsule_submit_update(struct capsule_info *cap_info) { + efi_capsule_header_t *cap_hdr; + void *mapped_pages; int ret; - void *cap_hdr_temp; - cap_hdr_temp = vmap(cap_info->pages, cap_info->index, - VM_MAP, PAGE_KERNEL); - if (!cap_hdr_temp) + mapped_pages = vmap(cap_info->pages, cap_info->index, + VM_MAP, PAGE_KERNEL); + if (!mapped_pages) return -ENOMEM; - ret = efi_capsule_update(cap_hdr_temp, cap_info->pages); - vunmap(cap_hdr_temp); + cap_hdr = mapped_pages + cap_info->efi_hdr_displacement; + + ret = efi_capsule_update(cap_hdr, cap_info->efi_hdr_displacement, + cap_info->pages); + vunmap(mapped_pages); if (ret) { pr_err("capsule update failed\n"); return ret; diff --git a/drivers/firmware/efi/capsule.c b/drivers/firmware/efi/capsule.c index 6eedff4..a60c4c4 100644 --- a/drivers/firmware/efi/capsule.c +++ b/drivers/firmware/efi/capsule.c @@ -184,6 +184,8 @@ efi_capsule_update_locked(efi_capsule_header_t *capsule, /** * efi_capsule_update - send a capsule to the firmware * @capsule: capsule to send to firmware + * @efi_hdr_displacement: EFI header offset on first data page (only needed for + * non-conforming CSH capsules) * @pages: an array of capsule data pages * * Build a scatter gather list with EFI capsule block descriptors to @@ -214,9 +216,12 @@ efi_capsule_update_locked(efi_capsule_header_t *capsule, * * Return 0 on success, a converted EFI status code on failure. */ -int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages) +int efi_capsule_update(efi_capsule_header_t *capsule, + unsigned int efi_hdr_displacement, + struct page **pages) { u32 imagesize = capsule->imagesize; + u32 total_size = imagesize + efi_hdr_displacement; efi_guid_t guid = capsule->guid; unsigned int count, sg_count; u32 flags = capsule->flags; @@ -224,11 +229,14 @@ int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages) int rv, reset_type; int i, j; - rv = efi_capsule_supported(guid, flags, imagesize, &reset_type); + if (efi_hdr_displacement > PAGE_SIZE - sizeof(efi_capsule_header_t)) + return -EINVAL; + + rv = efi_capsule_supported(guid, flags, total_size, &reset_type); if (rv) return rv; - count = DIV_ROUND_UP(imagesize, PAGE_SIZE); + count = DIV_ROUND_UP(total_size, PAGE_SIZE); sg_count = sg_pages_num(count); sg_pages = kzalloc(sg_count * sizeof(*sg_pages), GFP_KERNEL); @@ -255,8 +263,13 @@ int efi_capsule_update(efi_capsule_header_t *capsule, struct page **pages) for (j = 0; j < SGLIST_PER_PAGE && count > 0; j++) { u64 sz = min_t(u64, imagesize, PAGE_SIZE); - sglist[j].length = sz; sglist[j].data = page_to_phys(*pages++); + if (efi_hdr_displacement > 0) { + sglist[j].data += efi_hdr_displacement; + sz -= efi_hdr_displacement; + efi_hdr_displacement = 0; + } + sglist[j].length = sz; imagesize -= sz; count--; diff --git a/include/linux/efi.h b/include/linux/efi.h index 94d34e0..d83095c6 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1403,6 +1403,7 @@ extern int efi_capsule_supported(efi_guid_t guid, u32 flags, size_t size, int *reset); extern int efi_capsule_update(efi_capsule_header_t *capsule, + unsigned int efi_hdr_displacement, struct page **pages); #ifdef CONFIG_EFI_RUNTIME_MAP -- 2.10.2