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dm: Check for device sector overflow if CONFIG_LBDAF is not set 

Reference to a device in device-mapper table contains offset in sectors.

If the sector_t is 32bit integer (CONFIG_LBDAF is not set), then
several device-mapper targets can overflow this offset and validity
check is then performed on a wrong offset and a wrong table is activated.

See for example (on 32bit without CONFIG_LBDAF) this overflow:

  # dmsetup create test --table "0 2048 linear /dev/sdg 4294967297"
  # dmsetup table test
  0 2048 linear 8:96 1

This patch adds explicit check for overflow if the offset is sector_t type.

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Milan Broz 2018-11-07 22:24:55 +01:00 committed by Mike Snitzer
parent 8d683dcd65
commit ef87bfc24f
6 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/dm-crypt.c
View File

@ -2781,7 +2781,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
ret = -EINVAL;
if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
ti->error = "Invalid device sector";
goto bad;
}

2
drivers/md/dm-delay.c
View File

@ -141,7 +141,7 @@ static int delay_class_ctr(struct dm_target *ti, struct delay_class *c, char **a
unsigned long long tmpll;
char dummy;
if (sscanf(argv[1], "%llu%c", &tmpll, &dummy) != 1) {
if (sscanf(argv[1], "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
ti->error = "Invalid device sector";
return -EINVAL;
}

2
drivers/md/dm-flakey.c
View File

@ -213,7 +213,7 @@ static int flakey_ctr(struct dm_target *ti, unsigned int argc, char **argv)
devname = dm_shift_arg(&as);
r = -EINVAL;
if (sscanf(dm_shift_arg(&as), "%llu%c", &tmpll, &dummy) != 1) {
if (sscanf(dm_shift_arg(&as), "%llu%c", &tmpll, &dummy) != 1 || tmpll != (sector_t)tmpll) {
ti->error = "Invalid device sector";
goto bad;
}

2
drivers/md/dm-linear.c
View File

@ -45,7 +45,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
ret = -EINVAL;
if (sscanf(argv[1], "%llu%c", &tmp, &dummy) != 1) {
if (sscanf(argv[1], "%llu%c", &tmp, &dummy) != 1 || tmp != (sector_t)tmp) {
ti->error = "Invalid device sector";
goto bad;
}

3
drivers/md/dm-raid1.c
View File

@ -943,7 +943,8 @@ static int get_mirror(struct mirror_set *ms, struct dm_target *ti,
char dummy;
int ret;
if (sscanf(argv[1], "%llu%c", &offset, &dummy) != 1) {
if (sscanf(argv[1], "%llu%c", &offset, &dummy) != 1 ||
offset != (sector_t)offset) {
ti->error = "Invalid offset";
return -EINVAL;
}

2
drivers/md/dm-unstripe.c
View File

@ -78,7 +78,7 @@ static int unstripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
goto err;
}
if (sscanf(argv[4], "%llu%c", &start, &dummy) != 1) {
if (sscanf(argv[4], "%llu%c", &start, &dummy) != 1 || start != (sector_t)start) {
ti->error = "Invalid striped device offset";
goto err;
}