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29 July 2024, 15:18:00 UTC
Revision e4465fdaeb3f7b5ef47f389d3eac76db79ff20d8 authored by Michael Halcrow on 04 March 2008, 22:29:24 UTC, committed by Linus Torvalds on 05 March 2008, 00:35:16 UTC 
eCryptfs: make ecryptfs_prepare_write decrypt the page
 
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.)

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Benedikt Driessen <bdriessen@escrypt.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 87ffbe6
History
Tip revision: e4465fdaeb3f7b5ef47f389d3eac76db79ff20d8 authored by Michael Halcrow on 04 March 2008, 22:29:24 UTC
eCryptfs: make ecryptfs_prepare_write decrypt the page
Tip revision: e4465fd
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