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authorMichael Halcrow <mhalcrow@us.ibm.com>2008-03-04 14:29:24 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-03-04 16:35:16 -0800
commite4465fdaeb3f7b5ef47f389d3eac76db79ff20d8 (patch)
tree11dd43980a7df9ba7875a4d5fb55085d152bbdc6 /include/asm-sh
parent87ffbe679e21cbf82ff8e3302520ff0ea2beed9a (diff)
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>
Diffstat (limited to 'include/asm-sh')
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