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>

6 files changed, 7 insertions, 6 deletions

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 9a4dec0a0f71..fc7d8b8a654f 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -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;
         }
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index 2fb7bb4304ad..fddffe251bf6 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -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;
         }
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index 3cb97fa4c11d..8261aa8c7fe1 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -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;
         }
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 8d7ddee6ac4d..ad980a38fb1e 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -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;
         }
diff --git a/drivers/md/dm-raid1.c b/drivers/md/dm-raid1.c
index 79eab1071ec2..5a51151f680d 100644
--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -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;
         }
diff --git a/drivers/md/dm-unstripe.c b/drivers/md/dm-unstripe.c
index 954b7ab4e684..e673dacf6418 100644
--- a/drivers/md/dm-unstripe.c
+++ b/drivers/md/dm-unstripe.c
@@ -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;
         }