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authorJan Kara <jack@suse.cz>2018-02-22 10:39:52 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-30 07:47:44 +0200
commite9973931f57a8f8490d654124f26a95ba8ae78aa (patch)
treeed1d045ee7bde5fbadf0b6ff9ca67f0650df1e65
parent5771618d5c851811736b18ceaea7cb24ec1316d7 (diff)
udf: Provide saner default for invalid uid / gid
[ Upstream commit 116e5258e4115aca0c64ac0bf40ded3b353ed626 ] 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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-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 592918e7aaba..1ed8f0dd517e 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -2067,8 +2067,9 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
struct udf_sb_info *sbi;
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;