Commit c9eb13a9 authored Apr 30, 2016 by Theodore Ts'o

ext4: fix hang when processing corrupted orphaned inode list

If the orphaned inode list contains inode #5, ext4_iget() returns a
bad inode (since the bootloader inode should never be referenced
directly).  Because of the bad inode, we end up processing the inode
repeatedly and this hangs the machine.

This can be reproduced via:

   mke2fs -t ext4 /tmp/foo.img 100
   debugfs -w -R "ssv last_orphan 5" /tmp/foo.img
   mount -o loop /tmp/foo.img /mnt

(But don't do this if you are using an unpatched kernel if you care
about the system staying functional.  :-)

This bug was found by the port of American Fuzzy Lop into the kernel
to find file system problems[1].  (Since it *only* happens if inode #5
shows up on the orphan list --- 3, 7, 8, etc. won't do it, it's not
surprising that AFL needed two hours before it found it.)

[1] http://events.linuxfoundation.org/sites/events/files/slides/AFL%20filesystem%20fuzzing%2C%20Vault%202016_0.pdf



Cc: stable@vger.kernel.org
Reported by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

parent 8d2ae1cb

fs/ext4/ialloc.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -1183,11 +1183,13 @@ struct inode ext4_orphan_get(struct super_block sb, unsigned long ino)
		goto iget_failed;

		/*
		* If the orphans has i_nlinks > 0 then it should be able to be
		* truncated, otherwise it won't be removed from the orphan list
		* during processing and an infinite loop will result.
		* If the orphans has i_nlinks > 0 then it should be able to
		* be truncated, otherwise it won't be removed from the orphan
		* list during processing and an infinite loop will result.
		* Similarly, it must not be a bad inode.
		*/
		if (inode->i_nlink && !ext4_can_truncate(inode))
		if ((inode->i_nlink && !ext4_can_truncate(inode)) \|\|
		is_bad_inode(inode))
		goto bad_orphan;

		if (NEXT_ORPHAN(inode) > max_ino)

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