f2fs: report correct st_size for encrypted symlinks
authorEric Biggers <ebiggers@google.com>
Fri, 2 Jul 2021 06:53:48 +0000 (23:53 -0700)
committerEric Biggers <ebiggers@google.com>
Mon, 26 Jul 2021 03:01:06 +0000 (20:01 -0700)
commit461b43a8f92e68e96c4424b31e15f2b35f1bbfa9
tree8fa4348c3ea7545b7ec93da5889b4285010e6c53
parent8c4bca10ceafc43b1ca0a9fab5fa27e13cbce99e
f2fs: report correct st_size for encrypted symlinks

The stat() family of syscalls report the wrong size for encrypted
symlinks, which has caused breakage in several userspace programs.

Fix this by calling fscrypt_symlink_getattr() after f2fs_getattr() for
encrypted symlinks.  This function computes the correct size by reading
and decrypting the symlink target (if it's not already cached).

For more details, see the commit which added fscrypt_symlink_getattr().

Fixes: cbaf042a3cc6 ("f2fs crypto: add symlink encryption")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-4-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
fs/f2fs/namei.c