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188 lines
4.0 KiB
C
188 lines
4.0 KiB
C
/*
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* Linksys boot counter reset code for mtd
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*
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* Copyright (C) 2013 Jonas Gorski <jogo@openwrt.org>
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* Portions Copyright (c) 2019, Jeff Kletsky
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License v2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <endian.h>
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#include <string.h>
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#include <errno.h>
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#include <stdint.h>
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#include <syslog.h>
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#include <sys/ioctl.h>
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#include <mtd/mtd-user.h>
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#include "mtd.h"
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#define BOOTCOUNT_MAGIC 0x20110811
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/*
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* EA6350v3, and potentially other NOR-boot devices,
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* use an offset increment of 16 between records,
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* not mtd_info_user.writesize (often 1 on NOR devices).
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*/
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#define BC_OFFSET_INCREMENT_MIN 16
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#define DLOG_OPEN()
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#define DLOG_ERR(...) do { \
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fprintf(stderr, "ERROR: " __VA_ARGS__); fprintf(stderr, "\n"); \
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} while (0)
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#define DLOG_NOTICE(...) do { \
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fprintf(stderr, __VA_ARGS__); fprintf(stderr, "\n"); \
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} while (0)
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#define DLOG_DEBUG(...)
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struct bootcounter {
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uint32_t magic;
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uint32_t count;
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uint32_t checksum;
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};
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static char page[2048];
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int mtd_resetbc(const char *mtd)
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{
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struct mtd_info_user mtd_info;
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struct bootcounter *curr = (struct bootcounter *)page;
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unsigned int i;
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unsigned int bc_offset_increment;
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int last_count = 0;
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int num_bc;
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int fd;
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int ret;
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int retval = 0;
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DLOG_OPEN();
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fd = mtd_check_open(mtd);
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if (ioctl(fd, MEMGETINFO, &mtd_info) < 0) {
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DLOG_ERR("Unable to obtain mtd_info for given partition name.");
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retval = -1;
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goto out;
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}
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/* Detect need to override increment (for EA6350v3) */
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if (mtd_info.writesize < BC_OFFSET_INCREMENT_MIN) {
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bc_offset_increment = BC_OFFSET_INCREMENT_MIN;
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DLOG_DEBUG("Offset increment set to %i for writesize of %i",
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bc_offset_increment, mtd_info.writesize);
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} else {
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bc_offset_increment = mtd_info.writesize;
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}
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num_bc = mtd_info.size / bc_offset_increment;
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for (i = 0; i < num_bc; i++) {
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pread(fd, curr, sizeof(*curr), i * bc_offset_increment);
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/* Existing code assumes erase is to 0xff; left as-is (2019) */
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if (curr->magic != BOOTCOUNT_MAGIC &&
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curr->magic != 0xffffffff) {
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DLOG_ERR("Unexpected magic %08x at offset %08x; aborting.",
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curr->magic, i * bc_offset_increment);
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retval = -2;
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goto out;
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}
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if (curr->magic == 0xffffffff)
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break;
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last_count = curr->count;
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}
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if (last_count == 0) { /* bootcount is already 0 */
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retval = 0;
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goto out;
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}
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if (i == num_bc) {
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DLOG_NOTICE("Boot-count log full with %i entries; erasing (expected occasionally).",
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i);
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struct erase_info_user erase_info;
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erase_info.start = 0;
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erase_info.length = mtd_info.size;
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ret = ioctl(fd, MEMERASE, &erase_info);
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if (ret < 0) {
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DLOG_ERR("Failed to erase boot-count log MTD; ioctl() MEMERASE returned %i",
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ret);
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retval = -3;
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goto out;
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}
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i = 0;
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}
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memset(curr, 0xff, bc_offset_increment);
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curr->magic = BOOTCOUNT_MAGIC;
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curr->count = 0;
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curr->checksum = BOOTCOUNT_MAGIC;
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/* Assumes bc_offset_increment is a multiple of mtd_info.writesize */
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ret = pwrite(fd, curr, bc_offset_increment, i * bc_offset_increment);
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if (ret < 0) {
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DLOG_ERR("Failed to write boot-count log entry; pwrite() returned %i",
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errno);
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retval = -4;
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goto out;
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} else {
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sync();
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DLOG_NOTICE("Boot count sucessfully reset to zero.");
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retval = 0;
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goto out;
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}
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out:
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close(fd);
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return retval;
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}
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