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src/file_ext2.c: add frama-c annotations

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This commit is contained in:
Christophe Grenier 2021-02-19 19:11:08 +01:00
parent 21e89f31e8
commit 5fbf32de89
2 changed files with 19 additions and 9 deletions
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2
src/ext2_common.h
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@ -222,7 +222,7 @@ uint64_t td_ext2fs_free_blocks_count(const struct ext2_super_block *super);
@ requires \separated(sb, partition);
@ assigns \nothing;
@ ensures \result == 7 ==> le32(sb->s_log_block_size) > 6;
@ ensures \result == 0 ==> le32(sb->s_log_block_size) < 32;
@ ensures \result == 0 ==> le32(sb->s_log_block_size) <= 6;
@ */
int test_EXT2(const struct ext2_super_block *sb, const partition_t *partition);

26
src/file_ext2.c
View file

@ -33,8 +33,8 @@
#include "ext2_common.h"
#include "filegen.h"
/*@ requires \valid(file_stat); */
static void register_header_check_ext2_fs(file_stat_t *file_stat);
static int header_check_ext2_fs(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new);
const file_hint_t file_hint_ext2_fs= {
.extension="ext2",
@ -45,18 +45,22 @@ const file_hint_t file_hint_ext2_fs= {
.register_header_check=&register_header_check_ext2_fs
};
static const unsigned char ext2_fs_header[2]= {0x53, 0xEF};
static void register_header_check_ext2_fs(file_stat_t *file_stat)
{
register_header_check(0x438, ext2_fs_header,sizeof(ext2_fs_header), &header_check_ext2_fs, file_stat);
}
/*@
@ requires buffer_size >= sizeof(struct ext2_super_block);
@ requires \valid_read(buffer+(0..buffer_size-1));
@ requires valid_file_recovery(file_recovery);
@ requires \valid(file_recovery_new);
@ requires file_recovery_new->blocksize > 0;
@ requires separation: \separated(&file_hint_ext2_fs, buffer+(..), file_recovery, file_recovery_new);
@ ensures \result == 0 || \result == 1;
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@*/
static int header_check_ext2_fs(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
const struct ext2_super_block *sb=(const struct ext2_super_block *)&buffer[0x400];
if(test_EXT2(sb, NULL)!=0)
return 0;
/*@ assert le32(sb->s_log_block_size) <= 6; */
if(le16(sb->s_block_group_nr)!=0)
return 0;
if(file_recovery->file_stat!=NULL &&
@ -73,4 +77,10 @@ static int header_check_ext2_fs(const unsigned char *buffer, const unsigned int
file_recovery_new->file_check=&file_check_size;
return 1;
}
static void register_header_check_ext2_fs(file_stat_t *file_stat)
{
static const unsigned char ext2_fs_header[2]= {0x53, 0xEF};
register_header_check(0x438, ext2_fs_header,sizeof(ext2_fs_header), &header_check_ext2_fs, file_stat);
}
#endif