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src/file_ecryptfs.c: add frama-c annotations

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This commit is contained in:
Christophe Grenier 2021-02-15 12:57:24 +01:00
parent 089742b48e
commit 726a675350
1 changed files with 24 additions and 6 deletions
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30
src/file_ecryptfs.c
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@ -32,8 +32,8 @@
#include "filegen.h"
#include "common.h"
/*@ requires \valid(file_stat); */
static void register_header_check_ecryptfs(file_stat_t *file_stat);
static int header_check_ecryptfs(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_ecryptfs= {
.extension="eCryptfs",
@ -56,11 +56,13 @@ struct ecrypfs_header {
uint32_t flags;
} __attribute__ ((gcc_struct, __packed__));
static void register_header_check_ecryptfs(file_stat_t *file_stat)
{
register_header_check(0, ecryptfs_header, sizeof(ecryptfs_header), &header_check_ecryptfs, file_stat);
}
/*@
@ requires valid_file_recovery(file_recovery);
@ requires \valid(file_recovery->handle);
@ requires \separated(file_recovery, file_recovery->handle, file_recovery->extension, &errno, &Frama_C_entropy_source);
@ requires file_recovery->file_check == &file_check_ecryptfs;
@ assigns file_recovery->file_size;
@*/
static void file_check_ecryptfs(file_recovery_t *file_recovery)
{
if(file_recovery->file_size < file_recovery->calculated_file_size)
@ -69,6 +71,17 @@ static void file_check_ecryptfs(file_recovery_t *file_recovery)
file_recovery->file_size=file_recovery->calculated_file_size+1024*1024;
}
/*@
@ requires buffer_size >= sizeof(struct ecrypfs_header);
@ 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_ecryptfs, buffer+(..), file_recovery, file_recovery_new);
@ assigns *file_recovery_new;
@ ensures \result == 0 || \result == 1;
@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
@*/
static int header_check_ecryptfs(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 ecrypfs_header *e=(const struct ecrypfs_header *)buffer;
@ -88,4 +101,9 @@ static int header_check_ecryptfs(const unsigned char *buffer, const unsigned int
file_recovery_new->file_check=&file_check_ecryptfs;
return 1;
}
static void register_header_check_ecryptfs(file_stat_t *file_stat)
{
register_header_check(0, ecryptfs_header, sizeof(ecryptfs_header), &header_check_ecryptfs, file_stat);
}
#endif