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af4ef71b89
This patch fixes assigning bi_crypt_key for moving data which was previously encrypted by f2fs. Note that, dm-default-key should not assign bi_crypt_key, if bi_crypt_skip is set. The bug sceanrios is: 1. write data with user key by f2fs - ENC(KU, IVU, DATA) 2. log out user key 3. read data #1 w/o user key from LBA #a 4. dm-default-key assigns default key - DEC(KD, LBA#a, ENC(KU, IVU, DATA)) 5. write data #1 w/o user key into LBA #b 6. dm-default-key assigns default key - ENC(KD, LBA#b, DEC(KD, LBA#a, ENC(KU, IVU, DATA))) 7. Read DATA out with valid logged-in user key - DEC(KU, IVU, ENC(KD, LBA#b, DEC(KD, LBA#a, ENC(KU, IVU, DATA)))) So, this patch introduces bi_crypt_skip to avoid 4. ~ 6 with right flow: 1. write data with user key by f2fs - ENC(KU, IVU, DATA) 2. log out user key 3. read data #1 w/o user key from LBA #a 4. dm-default-key skip to assign default key - ENC(KU, IVU, DATA) 5. write data #1 w/o user key into LBA #b 6. dm-default-key skips to assign default key - ENC(KU, IVU, DATA) 7. Try to read DATA with valid logged-in user key - DEC(KU, IVU, ENC(KU, IVU, DATA)) Bug: 68721442 Change-Id: Icefe85f608b7c3c84beb2bfa4267efd0f3787453 Signed-off-by: Jaegeuk Kim <jaegeuk@google.com> Signed-off-by: Shivaprasad Hongal <shongal@codeaurora.org>