linux-ext4 - [Bug 50261] New: Invalid d_type on readdir(), but e2fsck sees correct type

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <bug-50261-13602@https.bugzilla.kernel.org/>
Date:	Thu,  8 Nov 2012 09:40:08 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 50261] New: Invalid d_type on readdir(), but e2fsck sees
 correct type

https://bugzilla.kernel.org/show_bug.cgi?id=50261

           Summary: Invalid d_type on readdir(), but e2fsck sees correct
                    type
           Product: File System
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: bernd.schubert@...tmail.fm
        Regression: No

While writing the on-disk-format upgrade tool for the next fhgfs version, I
also added a sanity check for the hash-directories. And while testing it it
reported a problem:

* Migrating inodes... (Processing 8192 hash directories...)
* Progress: 
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/A7 type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/177 type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/739 type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/835 type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/D84 type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/111C type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/13C1 type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/15B7 type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/17EB type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/19CA type: 8
Warning entry is not a directory: /fhgfs/meta/meta.dir//entries/1FD4 type: 8

So somehow those few directories out of 8192 (for dentries and inodes, each, so
two times 8192) seem to have a wrong directory type. 
So I went ahead and checked if e2fsck would correct it. But e2fsck reported no
errors. So I went further ahead and added some debug code to e2fsck and indeed,
e2fsck sees the correct type:

inode: 6293106 nameLen: 4 entryName: 17EB fileType: 2 should_be: 2

(fprintf line in check_filetype() ).

For verification, the stat() output also looks right:

schubert@...eeze2 ~>stat /fhgfs/meta/meta.dir//entries/17EB
  File: `/fhgfs/meta/meta.dir//entries/17EB'
  Size: 4096            Blocks: 8          IO Block: 4096   directory
Device: fe10h/65040d    Inode: 6293106     Links: 2
Access: (0755/drwxr-xr-x)  Uid: ( 5741/schubert)   Gid: (  100/   users)
Access: 2012-11-07 13:37:00.280689000 +0100
Modify: 2012-10-31 16:27:14.024689006 +0100
Change: 2012-10-31 16:27:14.024689006 +0100

So somehow either libc or kernel report a wrong file_type field for those
dentries. I will do some in-kernel debugging later on.

-- 
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching the assignee of the bug.
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html