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fs: Use 64-bit type for filesystem timestamp

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Some filesystems nowadays use 64-bit types for timestamps. So, update
grub_dirhook_info struct to use an grub_int64_t type to store mtime.
This also updates the grub_unixtime2datetime() function to receive
a 64-bit timestamp argument and do 64-bit-safe divisions.

All the remaining conversion from 32-bit to 64-bit should be safe, as
32-bit to 64-bit attributions will be implicitly casted. The most
critical part in the 32-bit to 64-bit conversion is in the function
grub_unixtime2datetime() where it needs to deal with the 64-bit type.
So, for that, the grub_divmod64() helper has been used.

These changes enables the GRUB to support dates beyond y2038.

Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Carlos Maiolino 2021-05-24 19:40:05 +02:00 committed by Daniel Kiper
parent af54062b54
commit 81f1962393
16 changed files with 32 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
grub-core/fs/affs.c
View File

@ -641,7 +641,7 @@ grub_affs_label (grub_device_t device, char **label)
}
static grub_err_t
grub_affs_mtime (grub_device_t device, grub_int32_t *t)
grub_affs_mtime (grub_device_t device, grub_int64_t *t)
{
struct grub_affs_data *data;
grub_disk_t disk = device->disk;

2
grub-core/fs/ext2.c
View File

@ -1055,7 +1055,7 @@ grub_ext2_uuid (grub_device_t device, char **uuid)
/* Get mtime. */
static grub_err_t
grub_ext2_mtime (grub_device_t device, grub_int32_t *tm)
grub_ext2_mtime (grub_device_t device, grub_int64_t *tm)
{
struct grub_ext2_data *data;
grub_disk_t disk = device->disk;

4
grub-core/fs/fat.c
View File

@ -737,7 +737,7 @@ grub_fat_iterate_dir_next (grub_fshelp_node_t node,
* https://docs.microsoft.com/en-us/windows/win32/fileio/exfat-specification
*/
static int
grub_exfat_timestamp (grub_uint32_t field, grub_uint8_t msec, grub_int32_t *nix) {
grub_exfat_timestamp (grub_uint32_t field, grub_uint8_t msec, grub_int64_t *nix) {
struct grub_datetime datetime = {
.year = (field >> 25) + 1980,
.month = (field & 0x01E00000) >> 21,
@ -891,7 +891,7 @@ grub_fat_iterate_dir_next (grub_fshelp_node_t node,
* https://www.ecma-international.org/publications/files/ECMA-ST/Ecma-107.pdf
*/
static int
grub_fat_timestamp (grub_uint16_t time, grub_uint16_t date, grub_int32_t *nix) {
grub_fat_timestamp (grub_uint16_t time, grub_uint16_t date, grub_int64_t *nix) {
struct grub_datetime datetime = {
.year = (date >> 9) + 1980,
.month = (date & 0x01E0) >> 5,

2
grub-core/fs/hfs.c
View File

@ -1374,7 +1374,7 @@ grub_hfs_label (grub_device_t device, char **label)
}
static grub_err_t
grub_hfs_mtime (grub_device_t device, grub_int32_t *tm)
grub_hfs_mtime (grub_device_t device, grub_int64_t *tm)
{
struct grub_hfs_data *data;

2
grub-core/fs/hfsplus.c
View File

@ -1083,7 +1083,7 @@ grub_hfsplus_label (grub_device_t device, char **label)
/* Get mtime. */
static grub_err_t
grub_hfsplus_mtime (grub_device_t device, grub_int32_t *tm)
grub_hfsplus_mtime (grub_device_t device, grub_int64_t *tm)
{
struct grub_hfsplus_data *data;
grub_disk_t disk = device->disk;

6
grub-core/fs/iso9660.c
View File

@ -178,7 +178,7 @@ static grub_dl_t my_mod;
static grub_err_t
iso9660_to_unixtime (const struct grub_iso9660_date *i, grub_int32_t *nix)
iso9660_to_unixtime (const struct grub_iso9660_date *i, grub_int64_t *nix)
{
struct grub_datetime datetime;
@ -206,7 +206,7 @@ iso9660_to_unixtime (const struct grub_iso9660_date *i, grub_int32_t *nix)
}
static int
iso9660_to_unixtime2 (const struct grub_iso9660_date2 *i, grub_int32_t *nix)
iso9660_to_unixtime2 (const struct grub_iso9660_date2 *i, grub_int64_t *nix)
{
struct grub_datetime datetime;
@ -1107,7 +1107,7 @@ grub_iso9660_uuid (grub_device_t device, char **uuid)
/* Get writing time of filesystem. */
static grub_err_t
grub_iso9660_mtime (grub_device_t device, grub_int32_t *timebuf)
grub_iso9660_mtime (grub_device_t device, grub_int64_t *timebuf)
{
struct grub_iso9660_data *data;
grub_disk_t disk = device->disk;

2
grub-core/fs/nilfs2.c
View File

@ -1186,7 +1186,7 @@ grub_nilfs2_uuid (grub_device_t device, char **uuid)
/* Get mtime. */
static grub_err_t
grub_nilfs2_mtime (grub_device_t device, grub_int32_t * tm)
grub_nilfs2_mtime (grub_device_t device, grub_int64_t * tm)
{
struct grub_nilfs2_data *data;
grub_disk_t disk = device->disk;

2
grub-core/fs/squash4.c
View File

@ -1003,7 +1003,7 @@ grub_squash_close (grub_file_t file)
}
static grub_err_t
grub_squash_mtime (grub_device_t dev, grub_int32_t *tm)
grub_squash_mtime (grub_device_t dev, grub_int64_t *tm)
{
struct grub_squash_data *data = 0;

2
grub-core/fs/ufs.c
View File

@ -837,7 +837,7 @@ grub_ufs_uuid (grub_device_t device, char **uuid)
/* Get mtime. */
static grub_err_t
grub_ufs_mtime (grub_device_t device, grub_int32_t *tm)
grub_ufs_mtime (grub_device_t device, grub_int64_t *tm)
{
struct grub_ufs_data *data = 0;

2
grub-core/fs/zfs/zfs.c
View File

@ -3771,7 +3771,7 @@ zfs_uuid (grub_device_t device, char **uuid)
}
static grub_err_t
zfs_mtime (grub_device_t device, grub_int32_t *mt)
zfs_mtime (grub_device_t device, grub_int64_t *mt)
{
struct grub_zfs_data *data;
grub_zfs_endian_t ub_endian = GRUB_ZFS_UNKNOWN_ENDIAN;

14
grub-core/lib/datetime.c
View File

@ -19,6 +19,8 @@
#include <grub/datetime.h>
#include <grub/i18n.h>
#include <grub/misc.h>
#include <grub/mm.h>
static const char *const grub_weekday_names[] =
{
@ -60,7 +62,7 @@ grub_get_weekday_name (struct grub_datetime *datetime)
void
grub_unixtime2datetime (grub_int32_t nix, struct grub_datetime *datetime)
grub_unixtime2datetime (grub_int64_t nix, struct grub_datetime *datetime)
{
int i;
grub_uint8_t months[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
@ -73,11 +75,17 @@ grub_unixtime2datetime (grub_int32_t nix, struct grub_datetime *datetime)
unsigned days;
/* Seconds into current day. */
unsigned secs_in_day;
/* Transform C divisions and modulos to mathematical ones */
if (nix < 0)
days_epoch = -(((unsigned) (SECPERDAY-nix-1)) / SECPERDAY);
/*
* The result of division here shouldn't be larger than GRUB_INT_MAX.
* So, it's safe to store the result back in an int.
*/
days_epoch = -(grub_divmod64 (((grub_int64_t) (SECPERDAY) - nix - 1), SECPERDAY, NULL));
else
days_epoch = ((unsigned) nix) / SECPERDAY;
days_epoch = grub_divmod64 (nix, SECPERDAY, NULL);
secs_in_day = nix - days_epoch * SECPERDAY;
days = days_epoch + 69 * DAYSPERYEAR + 17;

2
grub-core/net/bootp.c
View File

@ -468,7 +468,7 @@ send_dhcp_packet (struct grub_net_network_level_interface *iface)
grub_err_t err;
struct grub_net_bootp_packet *pack;
struct grub_datetime date;
grub_int32_t t = 0;
grub_int64_t t = 0;
struct grub_net_buff *nb;
struct udphdr *udph;
grub_net_network_level_address_t target;

2
grub-core/normal/misc.c
View File

@ -136,7 +136,7 @@ grub_normal_print_device_info (const char *name)
}
if (fs->fs_mtime)
{
grub_int32_t tm;
grub_int64_t tm;
struct grub_datetime datetime;
(fs->fs_mtime) (dev, &tm);
if (grub_errno == GRUB_ERR_NONE)

5
grub-core/tests/sleep_test.c
View File

@ -32,7 +32,7 @@ static void
sleep_test (void)
{
struct grub_datetime st, en;
grub_int32_t stu = 0, enu = 0;
grub_int64_t stu = 0, enu = 0;
int is_delayok;
grub_test_assert (!grub_get_datetime (&st), "Couldn't retrieve start time");
grub_millisleep (10000);
@ -45,8 +45,7 @@ sleep_test (void)
if (enu - stu >= 15 && enu - stu <= 17)
is_delayok = 1;
#endif
grub_test_assert (is_delayok, "Interval out of range: %d", enu-stu);
grub_test_assert (is_delayok, "Interval out of range: %" PRIdGRUB_INT64_T, enu - stu);
}
GRUB_FUNCTIONAL_TEST (sleep_test, sleep_test);

4
include/grub/datetime.h
View File

@ -48,11 +48,11 @@ grub_err_t grub_set_datetime (struct grub_datetime *datetime);
int grub_get_weekday (struct grub_datetime *datetime);
const char *grub_get_weekday_name (struct grub_datetime *datetime);
void grub_unixtime2datetime (grub_int32_t nix,
void grub_unixtime2datetime (grub_int64_t nix,
struct grub_datetime *datetime);
static inline int
grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int32_t *nix)
grub_datetime2unixtime (const struct grub_datetime *datetime, grub_int64_t *nix)
{
grub_int32_t ret;
int y4, ay;

4
include/grub/fs.h
View File

@ -39,7 +39,7 @@ struct grub_dirhook_info
unsigned mtimeset:1;
unsigned case_insensitive:1;
unsigned inodeset:1;
grub_int32_t mtime;
grub_int64_t mtime;
grub_uint64_t inode;
};
@ -81,7 +81,7 @@ struct grub_fs
grub_err_t (*fs_uuid) (grub_device_t device, char **uuid);
/* Get writing time of filesystem. */
grub_err_t (*fs_mtime) (grub_device_t device, grub_int32_t *timebuf);
grub_err_t (*fs_mtime) (grub_device_t device, grub_int64_t *timebuf);
#ifdef GRUB_UTIL
/* Determine sectors available for embedding. */