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![Linus Torvalds](/assets/img/avatar_default.png)
direction misannotations and (hopefully) preventing more of the same for the future. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> -----BEGIN PGP SIGNATURE----- iHQEABYIAB0WIQQqUNBr3gm4hGXdBJlZ7Krx/gZQ6wUCY5ZzQAAKCRBZ7Krx/gZQ 65RZAP4nTkvOn0NZLVFkuGOx8pgJelXAvrteyAuecVL8V6CR4AD40qCVY51PJp8N MzwiRTeqnGDxTTF7mgd//IB6hoatAA== =bcvF -----END PGP SIGNATURE----- Merge tag 'pull-iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull iov_iter updates from Al Viro: "iov_iter work; most of that is about getting rid of direction misannotations and (hopefully) preventing more of the same for the future" * tag 'pull-iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: use less confusing names for iov_iter direction initializers iov_iter: saner checks for attempt to copy to/from iterator [xen] fix "direction" argument of iov_iter_kvec() [vhost] fix 'direction' argument of iov_iter_{init,bvec}() [target] fix iov_iter_bvec() "direction" argument [s390] memcpy_real(): WRITE is "data source", not destination... [s390] zcore: WRITE is "data source", not destination... [infiniband] READ is "data destination", not source... [fsi] WRITE is "data source", not destination... [s390] copy_oldmem_kernel() - WRITE is "data source", not destination csum_and_copy_to_iter(): handle ITER_DISCARD get rid of unlikely() on page_copy_sane() calls
575 lines
16 KiB
C
575 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ACPI Platform Firmware Runtime Update Device driver
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*
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* Copyright (C) 2021 Intel Corporation
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* Author: Chen Yu <yu.c.chen@intel.com>
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*
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* pfr_update driver is used for Platform Firmware Runtime
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* Update, which includes the code injection and driver update.
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/efi.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/idr.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/uio.h>
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#include <linux/uuid.h>
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#include <uapi/linux/pfrut.h>
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#define PFRU_FUNC_STANDARD_QUERY 0
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#define PFRU_FUNC_QUERY_UPDATE_CAP 1
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#define PFRU_FUNC_QUERY_BUF 2
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#define PFRU_FUNC_START 3
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#define PFRU_CODE_INJECT_TYPE 1
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#define PFRU_DRIVER_UPDATE_TYPE 2
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#define PFRU_REVID_1 1
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#define PFRU_REVID_2 2
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#define PFRU_DEFAULT_REV_ID PFRU_REVID_1
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enum cap_index {
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CAP_STATUS_IDX = 0,
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CAP_UPDATE_IDX = 1,
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CAP_CODE_TYPE_IDX = 2,
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CAP_FW_VER_IDX = 3,
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CAP_CODE_RT_VER_IDX = 4,
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CAP_DRV_TYPE_IDX = 5,
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CAP_DRV_RT_VER_IDX = 6,
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CAP_DRV_SVN_IDX = 7,
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CAP_PLAT_ID_IDX = 8,
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CAP_OEM_ID_IDX = 9,
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CAP_OEM_INFO_IDX = 10,
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CAP_NR_IDX
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};
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enum buf_index {
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BUF_STATUS_IDX = 0,
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BUF_EXT_STATUS_IDX = 1,
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BUF_ADDR_LOW_IDX = 2,
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BUF_ADDR_HI_IDX = 3,
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BUF_SIZE_IDX = 4,
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BUF_NR_IDX
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};
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enum update_index {
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UPDATE_STATUS_IDX = 0,
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UPDATE_EXT_STATUS_IDX = 1,
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UPDATE_AUTH_TIME_LOW_IDX = 2,
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UPDATE_AUTH_TIME_HI_IDX = 3,
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UPDATE_EXEC_TIME_LOW_IDX = 4,
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UPDATE_EXEC_TIME_HI_IDX = 5,
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UPDATE_NR_IDX
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};
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enum pfru_start_action {
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START_STAGE = 0,
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START_ACTIVATE = 1,
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START_STAGE_ACTIVATE = 2,
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};
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struct pfru_device {
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u32 rev_id, index;
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struct device *parent_dev;
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struct miscdevice miscdev;
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};
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static DEFINE_IDA(pfru_ida);
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/*
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* Manual reference:
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* https://uefi.org/sites/default/files/resources/Intel_MM_OS_Interface_Spec_Rev100.pdf
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*
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* pfru_guid is the parameter for _DSM method
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*/
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static const guid_t pfru_guid =
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GUID_INIT(0xECF9533B, 0x4A3C, 0x4E89, 0x93, 0x9E, 0xC7, 0x71,
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0x12, 0x60, 0x1C, 0x6D);
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/* pfru_code_inj_guid is the UUID to identify code injection EFI capsule file */
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static const guid_t pfru_code_inj_guid =
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GUID_INIT(0xB2F84B79, 0x7B6E, 0x4E45, 0x88, 0x5F, 0x3F, 0xB9,
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0xBB, 0x18, 0x54, 0x02);
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/* pfru_drv_update_guid is the UUID to identify driver update EFI capsule file */
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static const guid_t pfru_drv_update_guid =
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GUID_INIT(0x4569DD8C, 0x75F1, 0x429A, 0xA3, 0xD6, 0x24, 0xDE,
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0x80, 0x97, 0xA0, 0xDF);
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static inline int pfru_valid_revid(u32 id)
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{
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return id == PFRU_REVID_1 || id == PFRU_REVID_2;
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}
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static inline struct pfru_device *to_pfru_dev(struct file *file)
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{
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return container_of(file->private_data, struct pfru_device, miscdev);
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}
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static int query_capability(struct pfru_update_cap_info *cap_hdr,
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struct pfru_device *pfru_dev)
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{
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acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
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union acpi_object *out_obj;
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int ret = -EINVAL;
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out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
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pfru_dev->rev_id,
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PFRU_FUNC_QUERY_UPDATE_CAP,
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NULL, ACPI_TYPE_PACKAGE);
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if (!out_obj)
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return ret;
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if (out_obj->package.count < CAP_NR_IDX ||
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out_obj->package.elements[CAP_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[CAP_UPDATE_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[CAP_CODE_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
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out_obj->package.elements[CAP_FW_VER_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[CAP_CODE_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[CAP_DRV_TYPE_IDX].type != ACPI_TYPE_BUFFER ||
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out_obj->package.elements[CAP_DRV_RT_VER_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[CAP_DRV_SVN_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[CAP_PLAT_ID_IDX].type != ACPI_TYPE_BUFFER ||
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out_obj->package.elements[CAP_OEM_ID_IDX].type != ACPI_TYPE_BUFFER ||
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out_obj->package.elements[CAP_OEM_INFO_IDX].type != ACPI_TYPE_BUFFER)
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goto free_acpi_buffer;
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cap_hdr->status = out_obj->package.elements[CAP_STATUS_IDX].integer.value;
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if (cap_hdr->status != DSM_SUCCEED) {
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ret = -EBUSY;
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dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", cap_hdr->status);
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goto free_acpi_buffer;
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}
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cap_hdr->update_cap = out_obj->package.elements[CAP_UPDATE_IDX].integer.value;
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memcpy(&cap_hdr->code_type,
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out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.pointer,
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out_obj->package.elements[CAP_CODE_TYPE_IDX].buffer.length);
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cap_hdr->fw_version =
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out_obj->package.elements[CAP_FW_VER_IDX].integer.value;
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cap_hdr->code_rt_version =
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out_obj->package.elements[CAP_CODE_RT_VER_IDX].integer.value;
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memcpy(&cap_hdr->drv_type,
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out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.pointer,
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out_obj->package.elements[CAP_DRV_TYPE_IDX].buffer.length);
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cap_hdr->drv_rt_version =
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out_obj->package.elements[CAP_DRV_RT_VER_IDX].integer.value;
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cap_hdr->drv_svn =
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out_obj->package.elements[CAP_DRV_SVN_IDX].integer.value;
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memcpy(&cap_hdr->platform_id,
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out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.pointer,
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out_obj->package.elements[CAP_PLAT_ID_IDX].buffer.length);
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memcpy(&cap_hdr->oem_id,
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out_obj->package.elements[CAP_OEM_ID_IDX].buffer.pointer,
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out_obj->package.elements[CAP_OEM_ID_IDX].buffer.length);
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cap_hdr->oem_info_len =
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out_obj->package.elements[CAP_OEM_INFO_IDX].buffer.length;
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ret = 0;
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free_acpi_buffer:
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ACPI_FREE(out_obj);
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return ret;
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}
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static int query_buffer(struct pfru_com_buf_info *info,
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struct pfru_device *pfru_dev)
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{
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acpi_handle handle = ACPI_HANDLE(pfru_dev->parent_dev);
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union acpi_object *out_obj;
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int ret = -EINVAL;
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out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
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pfru_dev->rev_id, PFRU_FUNC_QUERY_BUF,
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NULL, ACPI_TYPE_PACKAGE);
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if (!out_obj)
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return ret;
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if (out_obj->package.count < BUF_NR_IDX ||
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out_obj->package.elements[BUF_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[BUF_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[BUF_ADDR_LOW_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[BUF_ADDR_HI_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[BUF_SIZE_IDX].type != ACPI_TYPE_INTEGER)
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goto free_acpi_buffer;
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info->status = out_obj->package.elements[BUF_STATUS_IDX].integer.value;
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info->ext_status =
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out_obj->package.elements[BUF_EXT_STATUS_IDX].integer.value;
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if (info->status != DSM_SUCCEED) {
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ret = -EBUSY;
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dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", info->status);
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dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n", info->ext_status);
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goto free_acpi_buffer;
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}
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info->addr_lo =
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out_obj->package.elements[BUF_ADDR_LOW_IDX].integer.value;
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info->addr_hi =
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out_obj->package.elements[BUF_ADDR_HI_IDX].integer.value;
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info->buf_size = out_obj->package.elements[BUF_SIZE_IDX].integer.value;
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ret = 0;
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free_acpi_buffer:
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ACPI_FREE(out_obj);
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return ret;
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}
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static int get_image_type(const struct efi_manage_capsule_image_header *img_hdr,
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struct pfru_device *pfru_dev)
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{
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const efi_guid_t *image_type_id = &img_hdr->image_type_id;
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/* check whether this is a code injection or driver update */
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if (guid_equal(image_type_id, &pfru_code_inj_guid))
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return PFRU_CODE_INJECT_TYPE;
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if (guid_equal(image_type_id, &pfru_drv_update_guid))
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return PFRU_DRIVER_UPDATE_TYPE;
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return -EINVAL;
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}
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static int adjust_efi_size(const struct efi_manage_capsule_image_header *img_hdr,
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int size)
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{
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/*
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* The (u64 hw_ins) was introduced in UEFI spec version 2,
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* and (u64 capsule_support) was introduced in version 3.
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* The size needs to be adjusted accordingly. That is to
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* say, version 1 should subtract the size of hw_ins+capsule_support,
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* and version 2 should sbstract the size of capsule_support.
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*/
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size += sizeof(struct efi_manage_capsule_image_header);
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switch (img_hdr->ver) {
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case 1:
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return size - 2 * sizeof(u64);
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case 2:
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return size - sizeof(u64);
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default:
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/* only support version 1 and 2 */
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return -EINVAL;
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}
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}
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static bool applicable_image(const void *data, struct pfru_update_cap_info *cap,
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struct pfru_device *pfru_dev)
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{
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struct pfru_payload_hdr *payload_hdr;
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const efi_capsule_header_t *cap_hdr = data;
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const struct efi_manage_capsule_header *m_hdr;
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const struct efi_manage_capsule_image_header *m_img_hdr;
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const struct efi_image_auth *auth;
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int type, size;
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/*
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* If the code in the capsule is older than the current
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* firmware code, the update will be rejected by the firmware,
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* so check the version of it upfront without engaging the
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* Management Mode update mechanism which may be costly.
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*/
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size = cap_hdr->headersize;
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m_hdr = data + size;
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/*
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* Current data structure size plus variable array indicated
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* by number of (emb_drv_cnt + payload_cnt)
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*/
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size += offsetof(struct efi_manage_capsule_header, offset_list) +
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(m_hdr->emb_drv_cnt + m_hdr->payload_cnt) * sizeof(u64);
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m_img_hdr = data + size;
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type = get_image_type(m_img_hdr, pfru_dev);
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if (type < 0)
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return false;
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size = adjust_efi_size(m_img_hdr, size);
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if (size < 0)
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return false;
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auth = data + size;
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size += sizeof(u64) + auth->auth_info.hdr.len;
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payload_hdr = (struct pfru_payload_hdr *)(data + size);
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/* finally compare the version */
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if (type == PFRU_CODE_INJECT_TYPE)
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return payload_hdr->rt_ver >= cap->code_rt_version;
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return payload_hdr->rt_ver >= cap->drv_rt_version;
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}
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static void print_update_debug_info(struct pfru_updated_result *result,
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struct pfru_device *pfru_dev)
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{
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dev_dbg(pfru_dev->parent_dev, "Update result:\n");
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dev_dbg(pfru_dev->parent_dev, "Authentication Time Low:%lld\n",
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result->low_auth_time);
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dev_dbg(pfru_dev->parent_dev, "Authentication Time High:%lld\n",
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result->high_auth_time);
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dev_dbg(pfru_dev->parent_dev, "Execution Time Low:%lld\n",
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result->low_exec_time);
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dev_dbg(pfru_dev->parent_dev, "Execution Time High:%lld\n",
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result->high_exec_time);
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}
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static int start_update(int action, struct pfru_device *pfru_dev)
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{
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union acpi_object *out_obj, in_obj, in_buf;
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struct pfru_updated_result update_result;
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acpi_handle handle;
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int ret = -EINVAL;
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memset(&in_obj, 0, sizeof(in_obj));
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memset(&in_buf, 0, sizeof(in_buf));
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in_obj.type = ACPI_TYPE_PACKAGE;
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in_obj.package.count = 1;
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in_obj.package.elements = &in_buf;
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in_buf.type = ACPI_TYPE_INTEGER;
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in_buf.integer.value = action;
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handle = ACPI_HANDLE(pfru_dev->parent_dev);
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out_obj = acpi_evaluate_dsm_typed(handle, &pfru_guid,
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pfru_dev->rev_id, PFRU_FUNC_START,
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&in_obj, ACPI_TYPE_PACKAGE);
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if (!out_obj)
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return ret;
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if (out_obj->package.count < UPDATE_NR_IDX ||
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out_obj->package.elements[UPDATE_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[UPDATE_EXT_STATUS_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].type != ACPI_TYPE_INTEGER ||
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out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].type != ACPI_TYPE_INTEGER)
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goto free_acpi_buffer;
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update_result.status =
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out_obj->package.elements[UPDATE_STATUS_IDX].integer.value;
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update_result.ext_status =
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out_obj->package.elements[UPDATE_EXT_STATUS_IDX].integer.value;
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if (update_result.status != DSM_SUCCEED) {
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ret = -EBUSY;
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dev_dbg(pfru_dev->parent_dev, "Error Status:%d\n", update_result.status);
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dev_dbg(pfru_dev->parent_dev, "Error Extended Status:%d\n",
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update_result.ext_status);
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goto free_acpi_buffer;
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}
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update_result.low_auth_time =
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out_obj->package.elements[UPDATE_AUTH_TIME_LOW_IDX].integer.value;
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update_result.high_auth_time =
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out_obj->package.elements[UPDATE_AUTH_TIME_HI_IDX].integer.value;
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update_result.low_exec_time =
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out_obj->package.elements[UPDATE_EXEC_TIME_LOW_IDX].integer.value;
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update_result.high_exec_time =
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out_obj->package.elements[UPDATE_EXEC_TIME_HI_IDX].integer.value;
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print_update_debug_info(&update_result, pfru_dev);
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ret = 0;
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free_acpi_buffer:
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ACPI_FREE(out_obj);
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return ret;
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}
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static long pfru_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct pfru_update_cap_info cap_hdr;
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struct pfru_device *pfru_dev = to_pfru_dev(file);
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void __user *p = (void __user *)arg;
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u32 rev;
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int ret;
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switch (cmd) {
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case PFRU_IOC_QUERY_CAP:
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ret = query_capability(&cap_hdr, pfru_dev);
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if (ret)
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return ret;
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if (copy_to_user(p, &cap_hdr, sizeof(cap_hdr)))
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return -EFAULT;
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return 0;
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case PFRU_IOC_SET_REV:
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if (copy_from_user(&rev, p, sizeof(rev)))
|
|
return -EFAULT;
|
|
|
|
if (!pfru_valid_revid(rev))
|
|
return -EINVAL;
|
|
|
|
pfru_dev->rev_id = rev;
|
|
|
|
return 0;
|
|
|
|
case PFRU_IOC_STAGE:
|
|
return start_update(START_STAGE, pfru_dev);
|
|
|
|
case PFRU_IOC_ACTIVATE:
|
|
return start_update(START_ACTIVATE, pfru_dev);
|
|
|
|
case PFRU_IOC_STAGE_ACTIVATE:
|
|
return start_update(START_STAGE_ACTIVATE, pfru_dev);
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
static ssize_t pfru_write(struct file *file, const char __user *buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
struct pfru_device *pfru_dev = to_pfru_dev(file);
|
|
struct pfru_update_cap_info cap;
|
|
struct pfru_com_buf_info buf_info;
|
|
phys_addr_t phy_addr;
|
|
struct iov_iter iter;
|
|
struct iovec iov;
|
|
char *buf_ptr;
|
|
int ret;
|
|
|
|
ret = query_buffer(&buf_info, pfru_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (len > buf_info.buf_size)
|
|
return -EINVAL;
|
|
|
|
iov.iov_base = (void __user *)buf;
|
|
iov.iov_len = len;
|
|
iov_iter_init(&iter, ITER_SOURCE, &iov, 1, len);
|
|
|
|
/* map the communication buffer */
|
|
phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
|
|
buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
|
|
if (!buf_ptr)
|
|
return -ENOMEM;
|
|
|
|
if (!copy_from_iter_full(buf_ptr, len, &iter)) {
|
|
ret = -EINVAL;
|
|
goto unmap;
|
|
}
|
|
|
|
/* check if the capsule header has a valid version number */
|
|
ret = query_capability(&cap, pfru_dev);
|
|
if (ret)
|
|
goto unmap;
|
|
|
|
if (!applicable_image(buf_ptr, &cap, pfru_dev))
|
|
ret = -EINVAL;
|
|
|
|
unmap:
|
|
memunmap(buf_ptr);
|
|
|
|
return ret ?: len;
|
|
}
|
|
|
|
static const struct file_operations acpi_pfru_fops = {
|
|
.owner = THIS_MODULE,
|
|
.write = pfru_write,
|
|
.unlocked_ioctl = pfru_ioctl,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
static int acpi_pfru_remove(struct platform_device *pdev)
|
|
{
|
|
struct pfru_device *pfru_dev = platform_get_drvdata(pdev);
|
|
|
|
misc_deregister(&pfru_dev->miscdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pfru_put_idx(void *data)
|
|
{
|
|
struct pfru_device *pfru_dev = data;
|
|
|
|
ida_free(&pfru_ida, pfru_dev->index);
|
|
}
|
|
|
|
static int acpi_pfru_probe(struct platform_device *pdev)
|
|
{
|
|
acpi_handle handle = ACPI_HANDLE(&pdev->dev);
|
|
struct pfru_device *pfru_dev;
|
|
int ret;
|
|
|
|
if (!acpi_has_method(handle, "_DSM")) {
|
|
dev_dbg(&pdev->dev, "Missing _DSM\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pfru_dev = devm_kzalloc(&pdev->dev, sizeof(*pfru_dev), GFP_KERNEL);
|
|
if (!pfru_dev)
|
|
return -ENOMEM;
|
|
|
|
ret = ida_alloc(&pfru_ida, GFP_KERNEL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
pfru_dev->index = ret;
|
|
ret = devm_add_action_or_reset(&pdev->dev, pfru_put_idx, pfru_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pfru_dev->rev_id = PFRU_DEFAULT_REV_ID;
|
|
pfru_dev->parent_dev = &pdev->dev;
|
|
|
|
pfru_dev->miscdev.minor = MISC_DYNAMIC_MINOR;
|
|
pfru_dev->miscdev.name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
|
|
"pfru%d", pfru_dev->index);
|
|
if (!pfru_dev->miscdev.name)
|
|
return -ENOMEM;
|
|
|
|
pfru_dev->miscdev.nodename = devm_kasprintf(&pdev->dev, GFP_KERNEL,
|
|
"acpi_pfr_update%d", pfru_dev->index);
|
|
if (!pfru_dev->miscdev.nodename)
|
|
return -ENOMEM;
|
|
|
|
pfru_dev->miscdev.fops = &acpi_pfru_fops;
|
|
pfru_dev->miscdev.parent = &pdev->dev;
|
|
|
|
ret = misc_register(&pfru_dev->miscdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
platform_set_drvdata(pdev, pfru_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct acpi_device_id acpi_pfru_ids[] = {
|
|
{"INTC1080"},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, acpi_pfru_ids);
|
|
|
|
static struct platform_driver acpi_pfru_driver = {
|
|
.driver = {
|
|
.name = "pfr_update",
|
|
.acpi_match_table = acpi_pfru_ids,
|
|
},
|
|
.probe = acpi_pfru_probe,
|
|
.remove = acpi_pfru_remove,
|
|
};
|
|
module_platform_driver(acpi_pfru_driver);
|
|
|
|
MODULE_DESCRIPTION("Platform Firmware Runtime Update device driver");
|
|
MODULE_LICENSE("GPL v2");
|