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4decc1699a
Two hardening fixes for nxboot power-loss resilience:
1. Add flash_partition_flush() calls between critical partition
operations in perform_update(). Without explicit flush barriers,
writes may remain buffered in RAM (e.g. via FTL rwbuffer) when
nxboot proceeds to the next phase. A power loss between phases
can leave the recovery image uncommitted while the staging
partition has already been consumed.
Flush points added:
- After copy_partition(primary, recovery) completes
- After copy_partition(update, primary) completes, before
erasing the staging first sector
2. Replace validate_image_header() with validate_image() in the
final primary validation path of nxboot_perform_update(). The
header-only check validates magic and platform identifier but
does not CRC-check the image body. After an interrupted update,
a corrupt primary with an intact header would pass this check
and be booted, resulting in a persistent boot failure.
Signed-off-by: Neil Berkman <neil@xuku.com>
187 lines
5.6 KiB
C
187 lines
5.6 KiB
C
/****************************************************************************
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* apps/boot/nxboot/loader/flash.h
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __BOOT_NXBOOT_LOADER_FLASH_H
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#define __BOOT_NXBOOT_LOADER_FLASH_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include <stddef.h>
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct flash_partition_info
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{
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int size;
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int blocksize;
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int neraseblocks;
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int erasesize;
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};
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/****************************************************************************
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* Public Functions Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: flash_partition_open
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*
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* Description:
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* Opens the partition based on a given name and returns the file
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* descriptor to it.
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*
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* Input parameters:
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* path: Path to the device.
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*
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* Returned Value:
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* Valid file descriptor on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_open(const char *path);
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/****************************************************************************
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* Name: flash_partition_close
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*
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* Description:
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* Closes opened partition.
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*
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* Input parameters:
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* fd: Valid file descriptor.
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*
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* Returned Value:
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* 0 on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_close(int fd);
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/****************************************************************************
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* Name: flash_partition_flush
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*
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* Description:
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* Flushes any buffered writes to the underlying storage.
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*
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* Input parameters:
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* fd: Valid file descriptor.
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*
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* Returned Value:
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* 0 on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_flush(int fd);
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/****************************************************************************
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* Name: flash_partition_write
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*
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* Description:
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* Writes count data pointed to by buf at offset off to a partition
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* referenced by file descriptor fd.
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*
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* Input parameters:
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* fd: Valid file descriptor.
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* buf: The pointer to data to be written.
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* count: Number of bytes to be written.
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* off: Write offset in bytes.
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*
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* Returned Value:
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* 0 on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_write(int fd, const void *buf, size_t count, off_t off);
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/****************************************************************************
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* Name: flash_partition_read
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*
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* Description:
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* Read count data to buffer buf at offset off from a partition
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* referenced by file descriptor fd.
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*
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* Input parameters:
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* fd: Valid file descriptor.
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* buf: The pointer where read data are stored.
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* count: Number of bytes to be read.
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* off: Read offset in bytes.
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*
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* Returned Value:
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* 0 on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_read(int fd, void *buf, size_t count, off_t off);
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/****************************************************************************
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* Name: flash_partition_erase
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*
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* Description:
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* Erases the entire partition.
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*
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* Input parameters:
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* fd: Valid file descriptor.
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*
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* Returned Value:
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* 0 on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_erase(int fd);
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/****************************************************************************
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* Name: flash_partition_erase_first_sector
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*
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* Description:
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* Erases the first sector of the partition
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*
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* Input parameters:
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* fd: Valid file descriptor.
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*
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* Returned Value:
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* 0 on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_erase_first_sector(int fd);
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/****************************************************************************
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* Name: flash_partition_info
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*
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* Description:
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* Returns the size of one block.
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*
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* Input parameters:
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* fd: Valid file descriptor.
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* info: Pointer to flash_partition_info structure where info is filled.
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*
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* Returned Value:
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* Size of the block on success, -1 on failure.
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*
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****************************************************************************/
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int flash_partition_info(int fd, struct flash_partition_info *info);
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#endif /* __BOOT_NXBOOT_LOADER_FLASH_H */
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