92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/*
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File: ext2_common.c
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Copyright (C) 1998-2013 Christophe GRENIER <grenier@cgsecurity.org>
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "types.h"
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#include "common.h"
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#include "ext2.h"
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#include "ext2_common.h"
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uint64_t td_ext2fs_blocks_count(const struct ext2_super_block *super)
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{
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return le32(super->s_blocks_count) |
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(EXT2_HAS_INCOMPAT_FEATURE(super, EXT4_FEATURE_INCOMPAT_64BIT) ?
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(uint64_t) le32(super->s_blocks_count_hi) << 32 : 0);
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}
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uint64_t td_ext2fs_free_blocks_count(const struct ext2_super_block *super)
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{
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return le32(super->s_free_blocks_count) |
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(EXT2_HAS_INCOMPAT_FEATURE(super, EXT4_FEATURE_INCOMPAT_64BIT) ?
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(uint64_t) le32(super->s_free_blocks_hi) << 32 : 0);
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}
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int test_EXT2(const struct ext2_super_block *sb, const partition_t *partition)
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{
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/* There is a little offset ... */
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if(le16(sb->s_magic)!=EXT2_SUPER_MAGIC)
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return 1;
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if (td_ext2fs_free_blocks_count(sb) > td_ext2fs_blocks_count(sb))
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return 2;
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if (le32(sb->s_free_inodes_count) > le32(sb->s_inodes_count))
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return 3;
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if (le16(sb->s_errors)!=0 &&
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(le16(sb->s_errors) != EXT2_ERRORS_CONTINUE) &&
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(le16(sb->s_errors) != EXT2_ERRORS_RO) &&
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(le16(sb->s_errors) != EXT2_ERRORS_PANIC))
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return 4;
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if ((le16(sb->s_state) & ~(EXT2_VALID_FS | EXT2_ERROR_FS))!=0)
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return 5;
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if(td_ext2fs_blocks_count(sb) == 0) /* reject empty filesystem */
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return 6;
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switch(le32(sb->s_log_block_size))
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{
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case 0:
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case 1:
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case 2: /* block size = 4096 (default) */
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case 3: /* can be 8192 on alpha */
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case 4: /* non standard blocksize */
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case 5: /* non standard blocksize */
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case 6: /* 64 KiB */
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break;
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default:
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return 7;
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}
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if(le32(sb->s_blocks_per_group)==0)
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return 8;
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if(partition==NULL)
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return 0;
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if(partition->part_size!=0 &&
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partition->part_size < td_ext2fs_blocks_count(sb) *
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(EXT2_MIN_BLOCK_SIZE<<le32(sb->s_log_block_size)))
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return 8;
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return 0;
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}
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