Eric Biggers ebiggers@kernel.org writes:
From: Eric Biggers ebiggers@google.com
Tryng to rename a directory that has all following properties fails with EINVAL and triggers the 'WARN_ON_ONCE(!fscrypt_has_encryption_key(dir))' in f2fs_match_ci_name():
- The directory is casefolded - The directory is encrypted - The directory's encryption key is not yet set up - The parent directory is *not* encryptedThe problem is incorrect handling of the lookup of ".." to get the parent reference to update. fscrypt_setup_filename() treats ".." (and ".") specially, as it's never encrypted. It's passed through as-is, and setting up the directory's key is not attempted. As the name isn't a no-key name, f2fs treats it as a "normal" name and attempts a casefolded comparison. That breaks the assumption of the WARN_ON_ONCE() in f2fs_match_ci_name() which assumes that for encrypted directories, casefolded comparisons only happen when the directory's key is set up.
We could just remove this WARN_ON_ONCE(). However, since casefolding is always a no-op on "." and ".." anyway, let's instead just not casefold these names. This results in the standard bytewise comparison.
Fixes: 7ad08a58bf67 ("f2fs: Handle casefolding with Encryption") Cc: stable@vger.kernel.org # v5.11+ Signed-off-by: Eric Biggers ebiggers@google.com
fs/f2fs/dir.c | 3 ++- fs/f2fs/f2fs.h | 10 +++++----- fs/f2fs/hash.c | 11 ++++++----- 3 files changed, 13 insertions(+), 11 deletions(-)
Hi Eric,
This looks good to me:
Reviewed-by: Gabriel Krisman Bertazi krisman@collabora.com
Thanks,