f2fs: report correct st_size for encrypted symlinks

commit 461b43a8f92e68e96c4424b31e15f2b35f1bbfa9 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index e20a0f9e68455b75c68d6d63f7a380ccaf249e15..edc80855974ace21adb06819467e1426df882039 100644 (file)
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -1219,9 +1219,18 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
        return target;
 }
 
+static int f2fs_encrypted_symlink_getattr(const struct path *path,
+                                         struct kstat *stat, u32 request_mask,
+                                         unsigned int query_flags)
+{
+       f2fs_getattr(path, stat, request_mask, query_flags);
+
+       return fscrypt_symlink_getattr(path, stat);
+}
+
 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
        .get_link       = f2fs_encrypted_get_link,
-       .getattr        = f2fs_getattr,
+       .getattr        = f2fs_encrypted_symlink_getattr,
        .setattr        = f2fs_setattr,
 #ifdef CONFIG_F2FS_FS_XATTR
        .listxattr      = f2fs_listxattr,