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23 October 2021, 00:29:24 UTC
Revision ba63f23d69a3a10e7e527a02702023da68ef8a6d authored by Eric Biggers on 08 September 2016, 21:20:38 UTC, committed by Theodore Ts'o on 10 September 2016, 05:18:57 UTC 
fscrypto: require write access to mount to set encryption policy
 
Since setting an encryption policy requires writing metadata to the
filesystem, it should be guarded by mnt_want_write/mnt_drop_write.
Otherwise, a user could cause a write to a frozen or readonly
filesystem.  This was handled correctly by f2fs but not by ext4.  Make
fscrypt_process_policy() handle it rather than relying on the filesystem
to get it right.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: stable@vger.kernel.org # 4.1+; check fs/{ext4,f2fs}
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: Jaegeuk Kim <jaegeuk@kernel.org>
1 parent 002ced4
History
Tip revision: ba63f23d69a3a10e7e527a02702023da68ef8a6d authored by Eric Biggers on 08 September 2016, 21:20:38 UTC
fscrypto: require write access to mount to set encryption policy
Tip revision: ba63f23
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