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![Paul Emge](/assets/img/avatar_default.png)
In ext4fs_read_file in ext4fs.c, a memset can overwrite the bounds of the destination memory region. This patch adds a check to disallow this. Signed-off-by: Paul Emge <paulemge@forallsecure.com>
301 lines
6.7 KiB
C
301 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2011 - 2012 Samsung Electronics
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* EXT4 filesystem implementation in Uboot by
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* Uma Shankar <uma.shankar@samsung.com>
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* Manjunatha C Achar <a.manjunatha@samsung.com>
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*
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* ext4ls and ext4load : Based on ext2 ls and load support in Uboot.
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* Ext4 read optimization taken from Open-Moko
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* Qi bootloader
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*
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* (C) Copyright 2004
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* esd gmbh <www.esd-electronics.com>
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* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
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*
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* based on code from grub2 fs/ext2.c and fs/fshelp.c by
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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*
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* ext4write : Based on generic ext4 protocol.
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*/
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#include <common.h>
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#include <ext_common.h>
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#include <ext4fs.h>
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#include "ext4_common.h"
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#include <div64.h>
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int ext4fs_symlinknest;
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struct ext_filesystem ext_fs;
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struct ext_filesystem *get_fs(void)
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{
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return &ext_fs;
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}
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void ext4fs_free_node(struct ext2fs_node *node, struct ext2fs_node *currroot)
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{
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if ((node != &ext4fs_root->diropen) && (node != currroot))
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free(node);
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}
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/*
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* Taken from openmoko-kernel mailing list: By Andy green
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* Optimized read file API : collects and defers contiguous sector
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* reads into one potentially more efficient larger sequential read action
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*/
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int ext4fs_read_file(struct ext2fs_node *node, loff_t pos,
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loff_t len, char *buf, loff_t *actread)
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{
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struct ext_filesystem *fs = get_fs();
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int i;
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lbaint_t blockcnt;
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int log2blksz = fs->dev_desc->log2blksz;
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int log2_fs_blocksize = LOG2_BLOCK_SIZE(node->data) - log2blksz;
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int blocksize = (1 << (log2_fs_blocksize + log2blksz));
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unsigned int filesize = le32_to_cpu(node->inode.size);
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lbaint_t previous_block_number = -1;
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lbaint_t delayed_start = 0;
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lbaint_t delayed_extent = 0;
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lbaint_t delayed_skipfirst = 0;
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lbaint_t delayed_next = 0;
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char *delayed_buf = NULL;
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char *start_buf = buf;
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short status;
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struct ext_block_cache cache;
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ext_cache_init(&cache);
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/* Adjust len so it we can't read past the end of the file. */
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if (len + pos > filesize)
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len = (filesize - pos);
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if (blocksize <= 0 || len <= 0) {
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ext_cache_fini(&cache);
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return -1;
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}
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blockcnt = lldiv(((len + pos) + blocksize - 1), blocksize);
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for (i = lldiv(pos, blocksize); i < blockcnt; i++) {
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long int blknr;
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int blockoff = pos - (blocksize * i);
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int blockend = blocksize;
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int skipfirst = 0;
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blknr = read_allocated_block(&node->inode, i, &cache);
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if (blknr < 0) {
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ext_cache_fini(&cache);
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return -1;
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}
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blknr = blknr << log2_fs_blocksize;
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/* Last block. */
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if (i == blockcnt - 1) {
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blockend = (len + pos) - (blocksize * i);
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/* The last portion is exactly blocksize. */
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if (!blockend)
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blockend = blocksize;
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}
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/* First block. */
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if (i == lldiv(pos, blocksize)) {
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skipfirst = blockoff;
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blockend -= skipfirst;
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}
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if (blknr) {
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int status;
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if (previous_block_number != -1) {
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if (delayed_next == blknr) {
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delayed_extent += blockend;
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delayed_next += blockend >> log2blksz;
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} else { /* spill */
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status = ext4fs_devread(delayed_start,
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delayed_skipfirst,
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delayed_extent,
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delayed_buf);
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if (status == 0) {
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ext_cache_fini(&cache);
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return -1;
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}
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previous_block_number = blknr;
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delayed_start = blknr;
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delayed_extent = blockend;
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delayed_skipfirst = skipfirst;
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delayed_buf = buf;
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delayed_next = blknr +
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(blockend >> log2blksz);
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}
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} else {
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previous_block_number = blknr;
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delayed_start = blknr;
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delayed_extent = blockend;
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delayed_skipfirst = skipfirst;
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delayed_buf = buf;
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delayed_next = blknr +
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(blockend >> log2blksz);
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}
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} else {
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int n;
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int n_left;
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if (previous_block_number != -1) {
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/* spill */
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status = ext4fs_devread(delayed_start,
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delayed_skipfirst,
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delayed_extent,
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delayed_buf);
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if (status == 0) {
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ext_cache_fini(&cache);
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return -1;
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}
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previous_block_number = -1;
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}
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/* Zero no more than `len' bytes. */
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n = blocksize - skipfirst;
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n_left = len - ( buf - start_buf );
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if (n > n_left)
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n = n_left;
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memset(buf, 0, n);
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}
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buf += blocksize - skipfirst;
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}
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if (previous_block_number != -1) {
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/* spill */
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status = ext4fs_devread(delayed_start,
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delayed_skipfirst, delayed_extent,
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delayed_buf);
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if (status == 0) {
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ext_cache_fini(&cache);
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return -1;
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}
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previous_block_number = -1;
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}
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*actread = len;
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ext_cache_fini(&cache);
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return 0;
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}
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int ext4fs_ls(const char *dirname)
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{
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struct ext2fs_node *dirnode = NULL;
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int status;
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if (dirname == NULL)
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return 0;
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status = ext4fs_find_file(dirname, &ext4fs_root->diropen, &dirnode,
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FILETYPE_DIRECTORY);
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if (status != 1) {
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printf("** Can not find directory. **\n");
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if (dirnode)
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ext4fs_free_node(dirnode, &ext4fs_root->diropen);
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return 1;
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}
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ext4fs_iterate_dir(dirnode, NULL, NULL, NULL);
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ext4fs_free_node(dirnode, &ext4fs_root->diropen);
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return 0;
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}
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int ext4fs_exists(const char *filename)
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{
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loff_t file_len;
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int ret;
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ret = ext4fs_open(filename, &file_len);
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return ret == 0;
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}
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int ext4fs_size(const char *filename, loff_t *size)
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{
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return ext4fs_open(filename, size);
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}
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int ext4fs_read(char *buf, loff_t offset, loff_t len, loff_t *actread)
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{
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if (ext4fs_root == NULL || ext4fs_file == NULL)
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return -1;
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return ext4fs_read_file(ext4fs_file, offset, len, buf, actread);
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}
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int ext4fs_probe(struct blk_desc *fs_dev_desc,
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disk_partition_t *fs_partition)
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{
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ext4fs_set_blk_dev(fs_dev_desc, fs_partition);
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if (!ext4fs_mount(fs_partition->size)) {
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ext4fs_close();
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return -1;
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}
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return 0;
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}
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int ext4_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
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loff_t *len_read)
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{
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loff_t file_len;
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int ret;
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ret = ext4fs_open(filename, &file_len);
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if (ret < 0) {
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printf("** File not found %s **\n", filename);
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return -1;
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}
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if (len == 0)
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len = file_len;
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return ext4fs_read(buf, offset, len, len_read);
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}
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int ext4fs_uuid(char *uuid_str)
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{
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if (ext4fs_root == NULL)
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return -1;
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#ifdef CONFIG_LIB_UUID
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uuid_bin_to_str((unsigned char *)ext4fs_root->sblock.unique_id,
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uuid_str, UUID_STR_FORMAT_STD);
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return 0;
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#else
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return -ENOSYS;
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#endif
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}
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void ext_cache_init(struct ext_block_cache *cache)
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{
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memset(cache, 0, sizeof(*cache));
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}
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void ext_cache_fini(struct ext_block_cache *cache)
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{
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free(cache->buf);
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ext_cache_init(cache);
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}
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int ext_cache_read(struct ext_block_cache *cache, lbaint_t block, int size)
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{
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/* This could be more lenient, but this is simple and enough for now */
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if (cache->buf && cache->block == block && cache->size == size)
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return 1;
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ext_cache_fini(cache);
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cache->buf = malloc(size);
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if (!cache->buf)
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return 0;
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if (!ext4fs_devread(block, 0, size, cache->buf)) {
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ext_cache_fini(cache);
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return 0;
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}
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cache->block = block;
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cache->size = size;
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return 1;
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}
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