From 464df1d5e5ab1322e2dd0a7796939fff1aeefa9a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:49:25 +0200 Subject: Adding upstream version 1.47.0. Signed-off-by: Daniel Baumann --- lib/ext2fs/check_desc.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 104 insertions(+) create mode 100644 lib/ext2fs/check_desc.c (limited to 'lib/ext2fs/check_desc.c') diff --git a/lib/ext2fs/check_desc.c b/lib/ext2fs/check_desc.c new file mode 100644 index 0000000..3e3fa94 --- /dev/null +++ b/lib/ext2fs/check_desc.c @@ -0,0 +1,104 @@ +/* + * check_desc.c --- Check the group descriptors of an ext2 filesystem + * + * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Library + * General Public License, version 2. + * %End-Header% + */ + +#include "config.h" +#include +#include +#if HAVE_UNISTD_H +#include +#endif +#include +#include +#if HAVE_SYS_STAT_H +#include +#endif +#if HAVE_SYS_TYPES_H +#include +#endif + +#include "ext2_fs.h" +#include "ext2fs.h" + +/* + * This routine sanity checks the group descriptors + */ +errcode_t ext2fs_check_desc(ext2_filsys fs) +{ + ext2fs_block_bitmap bmap; + errcode_t retval; + dgrp_t i; + blk64_t first_block = fs->super->s_first_data_block; + blk64_t last_block = ext2fs_blocks_count(fs->super)-1; + blk64_t blk, b; + unsigned int j; + + EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); + + if (EXT2_DESC_SIZE(fs->super) & (EXT2_DESC_SIZE(fs->super) - 1)) + return EXT2_ET_BAD_DESC_SIZE; + + retval = ext2fs_allocate_subcluster_bitmap(fs, "check_desc map", &bmap); + if (retval) + return retval; + + for (i = 0; i < fs->group_desc_count; i++) + ext2fs_reserve_super_and_bgd(fs, i, bmap); + + for (i = 0; i < fs->group_desc_count; i++) { + if (!ext2fs_has_feature_flex_bg(fs->super)) { + first_block = ext2fs_group_first_block2(fs, i); + last_block = ext2fs_group_last_block2(fs, i); + } + + /* + * Check to make sure the block bitmap for group is sane + */ + blk = ext2fs_block_bitmap_loc(fs, i); + if (blk < first_block || blk > last_block || + ext2fs_test_block_bitmap2(bmap, blk)) { + retval = EXT2_ET_GDESC_BAD_BLOCK_MAP; + goto errout; + } + ext2fs_mark_block_bitmap2(bmap, blk); + + /* + * Check to make sure the inode bitmap for group is sane + */ + blk = ext2fs_inode_bitmap_loc(fs, i); + if (blk < first_block || blk > last_block || + ext2fs_test_block_bitmap2(bmap, blk)) { + retval = EXT2_ET_GDESC_BAD_INODE_MAP; + goto errout; + } + ext2fs_mark_block_bitmap2(bmap, blk); + + /* + * Check to make sure the inode table for group is sane + */ + blk = ext2fs_inode_table_loc(fs, i); + if (blk < first_block || + ((blk + fs->inode_blocks_per_group - 1) > last_block)) { + retval = EXT2_ET_GDESC_BAD_INODE_TABLE; + goto errout; + } + for (j = 0, b = blk; j < fs->inode_blocks_per_group; + j++, b++) { + if (ext2fs_test_block_bitmap2(bmap, b)) { + retval = EXT2_ET_GDESC_BAD_INODE_TABLE; + goto errout; + } + ext2fs_mark_block_bitmap2(bmap, b); + } + } +errout: + ext2fs_free_block_bitmap(bmap); + return retval; +} -- cgit v1.2.3