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[Bug 345766] Re: NULL crypt_stat dereference during lookup

To: ecryptfs@xxxxxxxxxxxxxxxxxxx
From: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxx>
Date: Mon, 23 Mar 2009 17:05:31 -0000
Reply-to: Bug 345766 <345766@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2aac0cf88681bfa092f731553bc7fbd23516be73

** Changed in: ecryptfs
       Status: In Progress => Fix Committed

-- 
NULL crypt_stat dereference during lookup
https://bugs.launchpad.net/bugs/345766
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Status in eCryptfs - Enterprise Cryptographic Filesystem: Fix Committed
Status in “ecryptfs-utils” source package in Ubuntu: Invalid
Status in “linux” source package in Ubuntu: Fix Released
Status in ecryptfs-utils in Ubuntu Jaunty: Invalid
Status in linux in Ubuntu Jaunty: Fix Released

Bug description:
If ecryptfs_encrypted_view or ecryptfs_xattr_metadata is being specified as mount options, a NULL pointer dereference is possible during lookup.

Reproduce:
---
# mount -t ecryptfs lower upper 
# touch upper/oops
# umout upper
# mount -t ecryptfs lower upper -o ecryptfs_encrypted_view
# ls upper/
---

You should have seen an oops after running `ls`.