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https://git.proxmox.com/git/fwupd
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5c9b1fcc81
The end year is legally and functionally redundant, and more importantly causes cherry-pick conflicts when trying to maintain old branches. Use git for history.
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
/*
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* Copyright (C) 2018 Richard Hughes <richard@hughsie.com>
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*
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* SPDX-License-Identifier: LGPL-2.1+
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*/
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#include "config.h"
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#include <efivar.h>
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#include "fu-common.h"
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#include "fu-uefi-devpath.h"
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#include "fwupd-error.h"
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typedef struct {
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guint8 type;
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guint8 subtype;
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GBytes *data;
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} FuUefiDevPath;
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static void
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fu_uefi_efi_dp_free (FuUefiDevPath *dp)
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{
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if (dp->data != NULL)
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g_bytes_unref (dp->data);
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g_free (dp);
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}
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GBytes *
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fu_uefi_devpath_find_data (GPtrArray *dps, guint8 type, guint8 subtype, GError **error)
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{
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for (guint i = 0; i < dps->len; i++) {
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FuUefiDevPath *dp = g_ptr_array_index (dps, i);
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if (dp->type == type && dp->subtype == subtype)
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return dp->data;
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}
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g_set_error (error,
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FWUPD_ERROR,
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FWUPD_ERROR_INTERNAL,
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"no DP with type 0x%02x and subtype 0x%02x",
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type, subtype);
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return NULL;
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}
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GPtrArray *
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fu_uefi_devpath_parse (const guint8 *buf, gsize sz,
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FuUefiDevpathParseFlags flags, GError **error)
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{
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guint16 offset = 0;
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g_autoptr(GPtrArray) dps = NULL;
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/* sanity check */
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if (sz < sizeof(efidp_header)) {
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g_set_error_literal (error,
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FWUPD_ERROR,
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FWUPD_ERROR_INTERNAL,
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"const_efidp is corrupt");
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return NULL;
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}
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dps = g_ptr_array_new_with_free_func ((GDestroyNotify) fu_uefi_efi_dp_free);
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while (1) {
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FuUefiDevPath *dp;
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const efidp_header *hdr = (efidp_header *) (buf + offset);
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guint16 hdr_length = GUINT16_FROM_LE(hdr->length);
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/* check if last entry */
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g_debug ("DP type:0x%02x subtype:0x%02x size:0x%04x",
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hdr->type, hdr->subtype, hdr->length);
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if (hdr->type == EFIDP_END_TYPE && hdr->subtype == EFIDP_END_ENTIRE)
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break;
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/* work around a bug in efi_va_generate_file_device_path_from_esp */
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if (offset + sizeof(efidp_header) + hdr->length > sz) {
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hdr_length = 0;
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fu_common_dump_full (G_LOG_DOMAIN, "efidp",
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buf + offset, sz - offset, 32,
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FU_DUMP_FLAGS_SHOW_ADDRESSES);
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for (guint16 i = offset + 4; i <= sz - 4; i++) {
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if (memcmp (buf + i, "\x7f\xff\x04\x00", 4) == 0) {
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hdr_length = i - offset;
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g_debug ("found END_ENTIRE at 0x%04x",
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(guint) (i - offset));
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break;
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}
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}
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if (hdr_length == 0) {
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g_set_error_literal (error,
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FWUPD_ERROR,
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FWUPD_ERROR_INTERNAL,
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"DP length invalid and no END_ENTIRE "
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"found, possibly data truncation?");
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return NULL;
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}
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if ((flags & FU_UEFI_DEVPATH_PARSE_FLAG_REPAIR) == 0) {
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g_set_error (error,
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FWUPD_ERROR,
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FWUPD_ERROR_INTERNAL,
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"DP length invalid, reported 0x%04x, maybe 0x%04x",
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hdr->length, hdr_length);
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return NULL;
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}
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g_debug ("DP length invalid! Truncating from 0x%04x to 0x%04x",
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hdr->length, hdr_length);
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}
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/* add new DP */
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dp = g_new0 (FuUefiDevPath, 1);
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dp->type = hdr->type;
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dp->subtype = hdr->subtype;
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if (hdr_length > 0)
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dp->data = g_bytes_new (buf + offset + 4, hdr_length);
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g_ptr_array_add (dps, dp);
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/* advance to next DP */
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offset += hdr_length;
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if (offset + sizeof(efidp_header) > sz) {
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g_set_error_literal (error,
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FWUPD_ERROR,
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FWUPD_ERROR_INTERNAL,
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"DP length invalid after fixing");
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return NULL;
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}
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}
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return g_steal_pointer (&dps);
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}
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