From: Jan Kara jack@suse.cz
commit dfd56c2c0c0dbb11be939b804ddc8d5395ab3432 upstream.
When setting password salt in the superblock, we forget to recompute the superblock checksum so it will not match until the next superblock modification which recomputes the checksum. Fix it.
CC: Michael Halcrow mhalcrow@google.com Reported-by: Andreas Dilger adilger@dilger.ca Fixes: 9bd8212f981e ("ext4 crypto: add encryption policy and password salt support") Signed-off-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20201216101844.22917-8-jack@suse.cz Signed-off-by: Theodore Ts'o tytso@mit.edu Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/ext4/ioctl.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -675,7 +675,10 @@ encryption_policy_out: err = ext4_journal_get_write_access(handle, sbi->s_sbh); if (err) goto pwsalt_err_journal; + lock_buffer(sbi->s_sbh); generate_random_uuid(sbi->s_es->s_encrypt_pw_salt); + ext4_superblock_csum_set(sb); + unlock_buffer(sbi->s_sbh); err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); pwsalt_err_journal: