diff options
| author | Qu Wenruo <wqu@suse.com> | 2023-09-27 04:13:15 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-10-04 02:03:08 +0300 |
| commit | 5f521494cc73520ffac18ede0758883b9aedd018 (patch) | |
| tree | 39e7f6d6744b119704af30b54c4d029e619c0d65 /fs | |
| parent | 9147b9ded499d9853bdf0e9804b7eaa99c4429ed (diff) | |
| download | linux-5f521494cc73520ffac18ede0758883b9aedd018.tar.xz | |
btrfs: reject unknown mount options early
[BUG]
The following script would allow invalid mount options to be specified
(although such invalid options would just be ignored):
# mkfs.btrfs -f $dev
# mount $dev $mnt1 <<< Successful mount expected
# mount $dev $mnt2 -o junk <<< Failed mount expected
# echo $?
0
[CAUSE]
For the 2nd mount, since the fs is already mounted, we won't go through
open_ctree() thus no btrfs_parse_options(), but only through
btrfs_parse_subvol_options().
However we do not treat unrecognized options from valid but irrelevant
options, thus those invalid options would just be ignored by
btrfs_parse_subvol_options().
[FIX]
Add the handling for Opt_err to handle invalid options and error out,
while still ignore other valid options inside btrfs_parse_subvol_options().
Reported-by: Anand Jain <anand.jain@oracle.com>
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/super.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 1a093ec0f7e3..f49e597e197f 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -954,6 +954,10 @@ static int btrfs_parse_subvol_options(const char *options, char **subvol_name, *subvol_objectid = subvolid; break; + case Opt_err: + btrfs_err(NULL, "unrecognized mount option '%s'", p); + error = -EINVAL; + goto out; default: break; } |