* [PATCH 1/2] dm-flakey: Use as->argc instead of argc
@ 2017-12-04 3:14 Goldwyn Rodrigues
2017-12-04 3:14 ` [PATCH 2/2] dm-flakey: Check for null arg_name Goldwyn Rodrigues
2018-01-05 21:59 ` [PATCH 1/2] dm-flakey: Use as->argc instead of argc Mike Snitzer
0 siblings, 2 replies; 3+ messages in thread
From: Goldwyn Rodrigues @ 2017-12-04 3:14 UTC (permalink / raw)
To: dm-devel; +Cc: Goldwyn Rodrigues
From: Goldwyn Rodrigues <rgoldwyn@suse.com>
Since arguments are divided in argument sets, using argc
fails corrupt_bio_byte because it is zero. We should
be using as->argc to check the number of arguments.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
drivers/md/dm-flakey.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index b82cb1ab1eaa..e18c29672a88 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -105,7 +105,7 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
* corrupt_bio_byte <Nth_byte> <direction> <value> <bio_flags>
*/
if (!strcasecmp(arg_name, "corrupt_bio_byte")) {
- if (!argc) {
+ if (as->argc < 4) {
ti->error = "Feature corrupt_bio_byte requires parameters";
return -EINVAL;
}
@@ -113,7 +113,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
r = dm_read_arg(_args + 1, as, &fc->corrupt_bio_byte, &ti->error);
if (r)
return r;
- argc--;
/*
* Direction r or w?
@@ -127,7 +126,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
ti->error = "Invalid corrupt bio direction (r or w)";
return -EINVAL;
}
- argc--;
/*
* Value of byte (0-255) to write in place of correct one.
@@ -135,7 +133,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
r = dm_read_arg(_args + 2, as, &fc->corrupt_bio_value, &ti->error);
if (r)
return r;
- argc--;
/*
* Only corrupt bios with these flags set.
@@ -143,7 +140,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
r = dm_read_arg(_args + 3, as, &fc->corrupt_bio_flags, &ti->error);
if (r)
return r;
- argc--;
continue;
}
--
2.14.2
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH 2/2] dm-flakey: Check for null arg_name
2017-12-04 3:14 [PATCH 1/2] dm-flakey: Use as->argc instead of argc Goldwyn Rodrigues
@ 2017-12-04 3:14 ` Goldwyn Rodrigues
2018-01-05 21:59 ` [PATCH 1/2] dm-flakey: Use as->argc instead of argc Mike Snitzer
1 sibling, 0 replies; 3+ messages in thread
From: Goldwyn Rodrigues @ 2017-12-04 3:14 UTC (permalink / raw)
To: dm-devel; +Cc: Goldwyn Rodrigues
From: Goldwyn Rodrigues <rgoldwyn@suse.com>
One can crash dm-flakey by specifying more number of feature arguments
than the number of features supplied. Checking for null in arg_name
avoids this.
dmsetup create flakey-test --table "0 66076080 flakey /dev/sdb9 0 0 180 2 \
drop_writes"
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
drivers/md/dm-flakey.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
index e18c29672a88..995b69e98f9f 100644
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -70,6 +70,11 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
arg_name = dm_shift_arg(as);
argc--;
+ if (!arg_name) {
+ ti->error = "Insufficient feature arguments";
+ return -EINVAL;
+ }
+
/*
* drop_writes
*/
--
2.14.2
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH 1/2] dm-flakey: Use as->argc instead of argc
2017-12-04 3:14 [PATCH 1/2] dm-flakey: Use as->argc instead of argc Goldwyn Rodrigues
2017-12-04 3:14 ` [PATCH 2/2] dm-flakey: Check for null arg_name Goldwyn Rodrigues
@ 2018-01-05 21:59 ` Mike Snitzer
1 sibling, 0 replies; 3+ messages in thread
From: Mike Snitzer @ 2018-01-05 21:59 UTC (permalink / raw)
To: Goldwyn Rodrigues; +Cc: dm-devel
On Sun, Dec 03 2017 at 10:14pm -0500,
Goldwyn Rodrigues <rgoldwyn@suse.de> wrote:
> From: Goldwyn Rodrigues <rgoldwyn@suse.com>
>
> Since arguments are divided in argument sets, using argc
> fails corrupt_bio_byte because it is zero. We should
> be using as->argc to check the number of arguments.
>
> Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
> ---
> drivers/md/dm-flakey.c | 6 +-----
> 1 file changed, 1 insertion(+), 5 deletions(-)
>
> diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
> index b82cb1ab1eaa..e18c29672a88 100644
> --- a/drivers/md/dm-flakey.c
> +++ b/drivers/md/dm-flakey.c
> @@ -105,7 +105,7 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
> * corrupt_bio_byte <Nth_byte> <direction> <value> <bio_flags>
> */
> if (!strcasecmp(arg_name, "corrupt_bio_byte")) {
> - if (!argc) {
> + if (as->argc < 4) {
> ti->error = "Feature corrupt_bio_byte requires parameters";
> return -EINVAL;
> }
> @@ -113,7 +113,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
> r = dm_read_arg(_args + 1, as, &fc->corrupt_bio_byte, &ti->error);
> if (r)
> return r;
> - argc--;
>
> /*
> * Direction r or w?
> @@ -127,7 +126,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
> ti->error = "Invalid corrupt bio direction (r or w)";
> return -EINVAL;
> }
> - argc--;
>
> /*
> * Value of byte (0-255) to write in place of correct one.
> @@ -135,7 +133,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
> r = dm_read_arg(_args + 2, as, &fc->corrupt_bio_value, &ti->error);
> if (r)
> return r;
> - argc--;
>
> /*
> * Only corrupt bios with these flags set.
> @@ -143,7 +140,6 @@ static int parse_features(struct dm_arg_set *as, struct flakey_c *fc,
> r = dm_read_arg(_args + 3, as, &fc->corrupt_bio_flags, &ti->error);
> if (r)
> return r;
> - argc--;
>
> continue;
> }
This is wrong. The outer control loop is using argc. Therefore it
needs to be managed.
But I'll grant you that the check should be "argc < 4" rather than the
less precise "!argc" check.
Mike
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-01-05 21:59 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2017-12-04 3:14 [PATCH 1/2] dm-flakey: Use as->argc instead of argc Goldwyn Rodrigues
2017-12-04 3:14 ` [PATCH 2/2] dm-flakey: Check for null arg_name Goldwyn Rodrigues
2018-01-05 21:59 ` [PATCH 1/2] dm-flakey: Use as->argc instead of argc Mike Snitzer
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