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Bug 435610

Summary: RHEL5.2: ecryptfs ecryptfs_prepare_write does not decrypt page
Product: Red Hat Enterprise Linux 5 Reporter: Eric Sandeen <esandeen>
Component: kernelAssignee: Eric Sandeen <esandeen>
Status: CLOSED DUPLICATE QA Contact: Martin Jenner <mjenner>
Severity: high Docs Contact:
Priority: medium    
Version: 5.2CC: mhalcrow
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-06-04 19:59:10 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Mike's patch, backported for RHEL5.2 none

Description Eric Sandeen 2008-03-02 15:04:17 UTC 
From Mike:

------------

When the page is not up to date, ecryptfs_prepare_write() should be
acting much like ecryptfs_readpage(). This includes the painfully
obvious step of actually decrypting the page contents read from the
lower encrypted file.

Note that this patch resolves a bug in eCryptfs in 2.6.24 that one can
produce with these steps:

# mount -t ecryptfs /secret /secret
# echo "abc" > /secret/file.txt
# umount /secret
# mount -t ecryptfs /secret /secret
# echo "def" >> /secret/file.txt
# cat /secret/file.txt

Without this patch, the resulting data returned from cat is likely to
be something other than "abc\ndef\n".

(Thanks to Benedikt Driessen for reporting this.)

------------

Verified the problem and the fix on RHEL5.2... backported patch attached.
Comment 1 Eric Sandeen 2008-03-02 15:04:17 UTC 
Created attachment 296513 [details]
Mike's patch, backported for RHEL5.2
Comment 2 Eric Sandeen 2008-06-04 19:59:10 UTC 
The 2.6.26 rebase in bug #449668 will include this.

*** This bug has been marked as a duplicate of 449668 ***