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authorMikulas Patocka <mpatocka@redhat.com>2012-03-28 18:41:26 +0100
committerAlasdair G Kergon <agk@redhat.com>2012-03-28 18:41:26 +0100
commit31998ef19385c944600d9a981b96252f98204bee (patch)
treeab757b8d6e3d349cf42827354e594687dcf6c5c8 /drivers/md/dm-delay.c
parent0447568fc51e0268e201f7086d2450cf986e0411 (diff)
downloadlinaro-lsk-31998ef19385c944600d9a981b96252f98204bee.tar.gz
dm: reject trailing characters in sccanf input
Device mapper uses sscanf to convert arguments to numbers. The problem is that the way we use it ignores additional unmatched characters in the scanned string. For example, this `if (sscanf(string, "%d", &number) == 1)' will match a number, but also it will match number with some garbage appended, like "123abc". As a result, device mapper accepts garbage after some numbers. For example the command `dmsetup create vg1-new --table "0 16384 linear 254:1bla 34816bla"' will pass without an error. This patch fixes all sscanf uses in device mapper. It appends "%c" with a pointer to a dummy character variable to every sscanf statement. The construct `if (sscanf(string, "%d%c", &number, &dummy) == 1)' succeeds only if string is a null-terminated number (optionally preceded by some whitespace characters). If there is some character appended after the number, sscanf matches "%c", writes the character to the dummy variable and returns 2. We check the return value for 1 and consequently reject numbers with some garbage appended. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-delay.c')
-rw-r--r--drivers/md/dm-delay.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
index f18375dcedd..2dc22dddb2a 100644
--- a/drivers/md/dm-delay.c
+++ b/drivers/md/dm-delay.c
@@ -131,6 +131,7 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
{
struct delay_c *dc;
unsigned long long tmpll;
+ char dummy;
if (argc != 3 && argc != 6) {
ti->error = "requires exactly 3 or 6 arguments";
@@ -145,13 +146,13 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
dc->reads = dc->writes = 0;
- if (sscanf(argv[1], "%llu", &tmpll) != 1) {
+ if (sscanf(argv[1], "%llu%c", &tmpll, &dummy) != 1) {
ti->error = "Invalid device sector";
goto bad;
}
dc->start_read = tmpll;
- if (sscanf(argv[2], "%u", &dc->read_delay) != 1) {
+ if (sscanf(argv[2], "%u%c", &dc->read_delay, &dummy) != 1) {
ti->error = "Invalid delay";
goto bad;
}
@@ -166,13 +167,13 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
if (argc == 3)
goto out;
- if (sscanf(argv[4], "%llu", &tmpll) != 1) {
+ if (sscanf(argv[4], "%llu%c", &tmpll, &dummy) != 1) {
ti->error = "Invalid write device sector";
goto bad_dev_read;
}
dc->start_write = tmpll;
- if (sscanf(argv[5], "%u", &dc->write_delay) != 1) {
+ if (sscanf(argv[5], "%u%c", &dc->write_delay, &dummy) != 1) {
ti->error = "Invalid write delay";
goto bad_dev_read;
}