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Stable shared branch between EFI and driver tree
Stable shared branch to ease the integration of Hans's series to support device firmware loaded from EFI boot service memory regions. [PATCH v12 00/10] efi/firmware/platform-x86: Add EFI embedded fw support https://lore.kernel.org/linux-efi/20200115163554.101315-1-hdegoede@redhat.com/ -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEnNKg2mrY9zMBdeK7wjcgfpV0+n0FAl5eJNoACgkQwjcgfpV0 +n16Fwf/fXCS+xefhIeXZuUQsQexDsofHYrWlt9oS74KF6iqxVDdfSRZHZvAT/Hr r1pYpMFSKhRy/u8hhTz1RxwoJXiwQg+yPKwLAMvt+xx2BaNJzLFPvWX8euHYDubM mWfrjStgandAcNzBDBIYYdG/fSYjlzq/xWF+rlYnnhMNa6lcYhecwgxmt0iYtMnB S31473zE7DZE0PyV9vEEMyaEbQJYprKrIGoaVpbQ80Y2f2MDNaft+7/EGXx5Hxex pHZrBdkCL1v7ej7pg8bcxqid682fle5tnogzxf5jo0xMMSXnT5xVPg4OL3rY7kwD Ba4cLaJD4Q1fFZ1GwPfa59PrDnUIfA== =sj1e -----END PGP SIGNATURE----- Merge tag 'stable-shared-branch-for-driver-tree' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi into driver-core-next Ard writes: Stable shared branch between EFI and driver tree Stable shared branch to ease the integration of Hans's series to support device firmware loaded from EFI boot service memory regions. [PATCH v12 00/10] efi/firmware/platform-x86: Add EFI embedded fw support https://lore.kernel.org/linux-efi/20200115163554.101315-1-hdegoede@redhat.com/ * tag 'stable-shared-branch-for-driver-tree' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: efi: Add embedded peripheral firmware support efi: Export boot-services code and data as debugfs-blobs
This commit is contained in:
Greg Kroah-Hartman
commit
4445eb6d94
@ -243,6 +243,7 @@ int __init efi_memblock_x86_reserve_range(void)
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efi.memmap.desc_version);
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memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
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set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags);
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return 0;
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}
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@ -943,6 +944,7 @@ static void __init __efi_enter_virtual_mode(void)
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goto err;
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}
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efi_check_for_embedded_firmwares();
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efi_free_boot_services();
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/*
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@ -410,6 +410,10 @@ void __init efi_free_boot_services(void)
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int num_entries = 0;
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void *new, *new_md;
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/* Keep all regions for /sys/kernel/debug/efi */
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if (efi_enabled(EFI_DBG))
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return;
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for_each_efi_memory_desc(md) {
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unsigned long long start = md->phys_addr;
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unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
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@ -239,6 +239,11 @@ config EFI_DISABLE_PCI_DMA
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endmenu
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config EFI_EMBEDDED_FIRMWARE
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bool
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depends on EFI
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select CRYPTO_LIB_SHA256
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config UEFI_CPER
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bool
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@ -26,6 +26,7 @@ obj-$(CONFIG_EFI_TEST) += test/
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obj-$(CONFIG_EFI_DEV_PATH_PARSER) += dev-path-parser.o
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obj-$(CONFIG_APPLE_PROPERTIES) += apple-properties.o
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obj-$(CONFIG_EFI_RCI2_TABLE) += rci2-table.o
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obj-$(CONFIG_EFI_EMBEDDED_FIRMWARE) += embedded-firmware.o
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fake_map-y += fake_mem.o
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fake_map-$(CONFIG_X86) += x86_fake_mem.o
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@ -17,6 +17,7 @@
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <linux/device.h>
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#include <linux/efi.h>
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#include <linux/of.h>
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@ -325,6 +326,59 @@ free_entry:
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static inline int efivar_ssdt_load(void) { return 0; }
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#endif
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#ifdef CONFIG_DEBUG_FS
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#define EFI_DEBUGFS_MAX_BLOBS 32
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static struct debugfs_blob_wrapper debugfs_blob[EFI_DEBUGFS_MAX_BLOBS];
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static void __init efi_debugfs_init(void)
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{
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struct dentry *efi_debugfs;
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efi_memory_desc_t *md;
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char name[32];
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int type_count[EFI_BOOT_SERVICES_DATA + 1] = {};
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int i = 0;
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efi_debugfs = debugfs_create_dir("efi", NULL);
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if (IS_ERR_OR_NULL(efi_debugfs))
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return;
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for_each_efi_memory_desc(md) {
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switch (md->type) {
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case EFI_BOOT_SERVICES_CODE:
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snprintf(name, sizeof(name), "boot_services_code%d",
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type_count[md->type]++);
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break;
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case EFI_BOOT_SERVICES_DATA:
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snprintf(name, sizeof(name), "boot_services_data%d",
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type_count[md->type]++);
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break;
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default:
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continue;
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}
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if (i >= EFI_DEBUGFS_MAX_BLOBS) {
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pr_warn("More then %d EFI boot service segments, only showing first %d in debugfs\n",
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EFI_DEBUGFS_MAX_BLOBS, EFI_DEBUGFS_MAX_BLOBS);
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break;
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}
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debugfs_blob[i].size = md->num_pages << EFI_PAGE_SHIFT;
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debugfs_blob[i].data = memremap(md->phys_addr,
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debugfs_blob[i].size,
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MEMREMAP_WB);
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if (!debugfs_blob[i].data)
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continue;
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debugfs_create_blob(name, 0400, efi_debugfs, &debugfs_blob[i]);
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i++;
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}
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}
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#else
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static inline void efi_debugfs_init(void) {}
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#endif
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/*
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* We register the efi subsystem with the firmware subsystem and the
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* efivars subsystem with the efi subsystem, if the system was booted with
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@ -381,6 +435,9 @@ static int __init efisubsys_init(void)
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goto err_remove_group;
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}
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if (efi_enabled(EFI_DBG) && efi_enabled(EFI_PRESERVE_BS_REGIONS))
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efi_debugfs_init();
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return 0;
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err_remove_group:
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147
drivers/firmware/efi/embedded-firmware.c
Normal file
147
drivers/firmware/efi/embedded-firmware.c
Normal file
@ -0,0 +1,147 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Support for extracting embedded firmware for peripherals from EFI code,
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*
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* Copyright (c) 2018 Hans de Goede <hdegoede@redhat.com>
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*/
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#include <linux/dmi.h>
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#include <linux/efi.h>
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#include <linux/efi_embedded_fw.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/vmalloc.h>
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#include <crypto/sha.h>
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/* Exported for use by lib/test_firmware.c only */
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LIST_HEAD(efi_embedded_fw_list);
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EXPORT_SYMBOL_GPL(efi_embedded_fw_list);
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static bool checked_for_fw;
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static const struct dmi_system_id * const embedded_fw_table[] = {
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NULL
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};
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/*
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* Note the efi_check_for_embedded_firmwares() code currently makes the
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* following 2 assumptions. This may needs to be revisited if embedded firmware
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* is found where this is not true:
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* 1) The firmware is only found in EFI_BOOT_SERVICES_CODE memory segments
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* 2) The firmware always starts at an offset which is a multiple of 8 bytes
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*/
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static int __init efi_check_md_for_embedded_firmware(
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efi_memory_desc_t *md, const struct efi_embedded_fw_desc *desc)
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{
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struct sha256_state sctx;
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struct efi_embedded_fw *fw;
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u8 sha256[32];
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u64 i, size;
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u8 *map;
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size = md->num_pages << EFI_PAGE_SHIFT;
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map = memremap(md->phys_addr, size, MEMREMAP_WB);
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if (!map) {
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pr_err("Error mapping EFI mem at %#llx\n", md->phys_addr);
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return -ENOMEM;
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}
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for (i = 0; (i + desc->length) <= size; i += 8) {
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if (memcmp(map + i, desc->prefix, EFI_EMBEDDED_FW_PREFIX_LEN))
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continue;
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sha256_init(&sctx);
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sha256_update(&sctx, map + i, desc->length);
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sha256_final(&sctx, sha256);
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if (memcmp(sha256, desc->sha256, 32) == 0)
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break;
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}
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if ((i + desc->length) > size) {
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memunmap(map);
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return -ENOENT;
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}
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pr_info("Found EFI embedded fw '%s'\n", desc->name);
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fw = kmalloc(sizeof(*fw), GFP_KERNEL);
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if (!fw) {
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memunmap(map);
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return -ENOMEM;
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}
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fw->data = kmemdup(map + i, desc->length, GFP_KERNEL);
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memunmap(map);
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if (!fw->data) {
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kfree(fw);
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return -ENOMEM;
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}
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fw->name = desc->name;
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fw->length = desc->length;
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list_add(&fw->list, &efi_embedded_fw_list);
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return 0;
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}
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void __init efi_check_for_embedded_firmwares(void)
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{
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const struct efi_embedded_fw_desc *fw_desc;
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const struct dmi_system_id *dmi_id;
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efi_memory_desc_t *md;
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int i, r;
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for (i = 0; embedded_fw_table[i]; i++) {
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dmi_id = dmi_first_match(embedded_fw_table[i]);
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if (!dmi_id)
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continue;
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fw_desc = dmi_id->driver_data;
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/*
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* In some drivers the struct driver_data contains may contain
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* other driver specific data after the fw_desc struct; and
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* the fw_desc struct itself may be empty, skip these.
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*/
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if (!fw_desc->name)
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continue;
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for_each_efi_memory_desc(md) {
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if (md->type != EFI_BOOT_SERVICES_CODE)
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continue;
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r = efi_check_md_for_embedded_firmware(md, fw_desc);
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if (r == 0)
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break;
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}
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}
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checked_for_fw = true;
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}
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int efi_get_embedded_fw(const char *name, const u8 **data, size_t *size)
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{
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struct efi_embedded_fw *iter, *fw = NULL;
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if (!checked_for_fw) {
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pr_warn("Warning %s called while we did not check for embedded fw\n",
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__func__);
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return -ENOENT;
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}
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list_for_each_entry(iter, &efi_embedded_fw_list, list) {
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if (strcmp(name, iter->name) == 0) {
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fw = iter;
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break;
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}
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}
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if (!fw)
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return -ENOENT;
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*data = fw->data;
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*size = fw->length;
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return 0;
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}
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EXPORT_SYMBOL_GPL(efi_get_embedded_fw);
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@ -1124,6 +1124,7 @@ extern int __init efi_setup_pcdp_console(char *);
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#define EFI_NX_PE_DATA 9 /* Can runtime data regions be mapped non-executable? */
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#define EFI_MEM_ATTR 10 /* Did firmware publish an EFI_MEMORY_ATTRIBUTES table? */
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#define EFI_MEM_NO_SOFT_RESERVE 11 /* Is the kernel configured to ignore soft reservations? */
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#define EFI_PRESERVE_BS_REGIONS 12 /* Are EFI boot-services memory segments available? */
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#ifdef CONFIG_EFI
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/*
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@ -1553,6 +1554,12 @@ static inline void
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efi_enable_reset_attack_mitigation(void) { }
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#endif
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#ifdef CONFIG_EFI_EMBEDDED_FIRMWARE
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void efi_check_for_embedded_firmwares(void);
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#else
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static inline void efi_check_for_embedded_firmwares(void) { }
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#endif
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efi_status_t efi_random_get_seed(void);
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void efi_retrieve_tpm2_eventlog(void);
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41
include/linux/efi_embedded_fw.h
Normal file
41
include/linux/efi_embedded_fw.h
Normal file
@ -0,0 +1,41 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_EFI_EMBEDDED_FW_H
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#define _LINUX_EFI_EMBEDDED_FW_H
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#include <linux/list.h>
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#include <linux/mod_devicetable.h>
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#define EFI_EMBEDDED_FW_PREFIX_LEN 8
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/*
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* This struct and efi_embedded_fw_list are private to the efi-embedded fw
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* implementation they are in this header for use by lib/test_firmware.c only!
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*/
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struct efi_embedded_fw {
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struct list_head list;
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const char *name;
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const u8 *data;
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size_t length;
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};
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extern struct list_head efi_embedded_fw_list;
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/**
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* struct efi_embedded_fw_desc - This struct is used by the EFI embedded-fw
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* code to search for embedded firmwares.
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*
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* @name: Name to register the firmware with if found
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* @prefix: First 8 bytes of the firmware
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* @length: Length of the firmware in bytes including prefix
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* @sha256: SHA256 of the firmware
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*/
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struct efi_embedded_fw_desc {
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const char *name;
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u8 prefix[EFI_EMBEDDED_FW_PREFIX_LEN];
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u32 length;
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u8 sha256[32];
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};
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int efi_get_embedded_fw(const char *name, const u8 **dat, size_t *sz);
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#endif
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