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/*
File: ext2_common.c
Copyright (C) 1998-2013 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include "types.h"
#include "common.h"
#include "ext2_common.h"
uint64_t td_ext2fs_blocks_count(const struct ext2_super_block *super)
{
const uint64_t lo=le32(super->s_blocks_count);
const uint64_t hi=le32(super->s_blocks_count_hi);
/*@ assert lo < 1 << 32; */
/*@ assert hi < 1 << 32; */
/*@ assert hi << 32 < (1 << 64); */
return lo |
(EXT2_HAS_INCOMPAT_FEATURE(super, EXT4_FEATURE_INCOMPAT_64BIT) ?
hi << 32 : 0);
}
uint64_t td_ext2fs_free_blocks_count(const struct ext2_super_block *super)
{
const uint64_t lo=le32(super->s_free_blocks_count);
const uint64_t hi=le32(super->s_free_blocks_hi);
/*@ assert lo < 1 << 32; */
/*@ assert hi < 1 << 32; */
/*@ assert hi << 32 < (1 << 64); */
return lo|
(EXT2_HAS_INCOMPAT_FEATURE(super, EXT4_FEATURE_INCOMPAT_64BIT) ?
hi << 32 : 0);
}
int test_EXT2(const struct ext2_super_block *sb, const partition_t *partition)
{
const unsigned int s_errors=le16(sb->s_errors);
const uint64_t blocks_count=td_ext2fs_blocks_count(sb);
const uint32_t s_log_block_size=le32(sb->s_log_block_size);
/* There is a little offset ... */
if(le16(sb->s_magic)!=EXT2_SUPER_MAGIC)
return 1;
if (td_ext2fs_free_blocks_count(sb) > blocks_count)
return 2;
if (le32(sb->s_free_inodes_count) > le32(sb->s_inodes_count))
return 3;
if (s_errors!=0 &&
(s_errors != EXT2_ERRORS_CONTINUE) &&
(s_errors != EXT2_ERRORS_RO) &&
(s_errors != EXT2_ERRORS_PANIC))
return 4;
if ((le16(sb->s_state) & ~(EXT2_VALID_FS | EXT2_ERROR_FS))!=0)
return 5;
if(blocks_count == 0) /* reject empty filesystem */
return 6;
switch(s_log_block_size)
{
case 0:
case 1:
case 2: /* block size = 4096 (default) */
case 3: /* can be 8192 on alpha */
case 4: /* non standard blocksize */
case 5: /* non standard blocksize */
case 6: /* 64 KiB */
break;
default:
return 7;
}
/*@ assert 0 <= s_log_block_size <= 6; */
if(le32(sb->s_blocks_per_group)==0)
return 8;
if(partition==NULL)
return 0;
/*@ assert 0 <= EXT2_MIN_BLOCK_SIZE<<s_log_block_size <= EXT2_MIN_BLOCK_SIZE<<6; */
/*@ assert 0 ≤ 64-10-s_log_block_size ≤ 64-10-6; */ ;
if(blocks_count >= (uint64_t)1 << (64-10-s_log_block_size))
return 9;
/*@ assert blocks_count < 1 << (64-10-s_log_block_size); */
if(partition->part_size!=0 &&
partition->part_size < blocks_count * ((uint64_t)EXT2_MIN_BLOCK_SIZE<<s_log_block_size))
return 8;
return 0;
}
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