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authorJan Kara <jack@suse.cz>2018-02-22 10:39:52 +0100
committerJan Kara <jack@suse.cz>2018-02-27 10:25:33 +0100
commit116e5258e4115aca0c64ac0bf40ded3b353ed626 (patch)
tree534cadc7bd1d2dbe8ad879728eb1716bb345d541 /fs/udf/super.c
parent0c9850f4d4c5d645125869fe0fa206fb662bd98b (diff)
downloadlinux-116e5258e4115aca0c64ac0bf40ded3b353ed626.tar.bz2
udf: Provide saner default for invalid uid / gid
Currently when UDF filesystem is recorded without uid / gid (ids are set to -1), we will assign INVALID_[UG]ID to vfs inode unless user uses uid= and gid= mount options. In such case filesystem could not be modified in any way as VFS refuses to modify files with invalid ids (even by root). This is confusing to users and not very useful default since such media mode is generally used for removable media. Use overflow[ug]id instead so that at least root can modify the filesystem. Reported-by: Steve Kenton <skenton@ou.edu> Reviewed-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/udf/super.c')
-rw-r--r--fs/udf/super.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 4d671be50059..31d8ce13fa18 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -2111,8 +2111,9 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
bool lvid_open = false;
uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
- uopt.uid = INVALID_UID;
- uopt.gid = INVALID_GID;
+ /* By default we'll use overflow[ug]id when UDF inode [ug]id == -1 */
+ uopt.uid = make_kuid(current_user_ns(), overflowuid);
+ uopt.gid = make_kgid(current_user_ns(), overflowgid);
uopt.umask = 0;
uopt.fmode = UDF_INVALID_MODE;
uopt.dmode = UDF_INVALID_MODE;