On Thu, Sep 08, 2016 at 02:20:38PM -0700, Eric Biggers wrote:
> [To apply cleanly, my other two patches must be applied before this one]
>
> 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@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 4.1+; check fs/{ext4,f2fs}
Thanks, I have this in the ext4.git's fixes branch, but I plan to only
send the other two fixes to Linus, since (a) they are more critical,
and I'd prefer to get an Acked-by from Jaeguk or Changman (as the f2fs
maintainers) before I send this fix to Linus, since it touches f2fs.
Jaeguk, Changman, any objections?
- Ted
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