[PATCH 1/2] prep for ceph_encode_encrypted_fname() fixes

[Al Viro <viro@zeniv.linux.org.uk>]

ceph_encode_encrypted_dname() would be better off with plaintext name
already copied into buffer; we'll lift that into the callers on the
next step, which will allow to fix UAF on races with rename; for now
copy it in the very beginning of ceph_encode_encrypted_dname().

That has a pleasant side benefit - we don't need to mess with tmp_buf
anymore (i.e. that's 256 bytes off the stack footprint).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/ceph/crypto.c | 40 +++++++++++++++++-----------------------
 1 file changed, 17 insertions(+), 23 deletions(-)

diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
index 3b3c4d8d401e..09346b91215a 100644
--- a/fs/ceph/crypto.c
+++ b/fs/ceph/crypto.c
@@ -265,31 +265,28 @@ int ceph_encode_encrypted_dname(struct inode *parent, struct qstr *d_name,
 {
 	struct ceph_client *cl = ceph_inode_to_client(parent);
 	struct inode *dir = parent;
-	struct qstr iname;
+	char *p = buf;
 	u32 len;
 	int name_len;
 	int elen;
 	int ret;
 	u8 *cryptbuf = NULL;
 
-	iname.name = d_name->name;
-	name_len = d_name->len;
+	memcpy(buf, d_name->name, d_name->len);
+	elen = d_name->len;
+
+	name_len = elen;
 
 	/* Handle the special case of snapshot names that start with '_' */
-	if ((ceph_snap(dir) == CEPH_SNAPDIR) && (name_len > 0) &&
-	    (iname.name[0] == '_')) {
-		dir = parse_longname(parent, iname.name, &name_len);
+	if (ceph_snap(dir) == CEPH_SNAPDIR && *p == '_') {
+		dir = parse_longname(parent, p, &name_len);
 		if (IS_ERR(dir))
 			return PTR_ERR(dir);
-		iname.name++; /* skip initial '_' */
+		p++; /* skip initial '_' */
 	}
-	iname.len = name_len;
 
-	if (!fscrypt_has_encryption_key(dir)) {
-		memcpy(buf, d_name->name, d_name->len);
-		elen = d_name->len;
+	if (!fscrypt_has_encryption_key(dir))
 		goto out;
-	}
 
 	/*
 	 * Convert cleartext d_name to ciphertext. If result is longer than
@@ -297,7 +294,7 @@ int ceph_encode_encrypted_dname(struct inode *parent, struct qstr *d_name,
 	 *
 	 * See: fscrypt_setup_filename
 	 */
-	if (!fscrypt_fname_encrypted_size(dir, iname.len, NAME_MAX, &len)) {
+	if (!fscrypt_fname_encrypted_size(dir, name_len, NAME_MAX, &len)) {
 		elen = -ENAMETOOLONG;
 		goto out;
 	}
@@ -310,7 +307,9 @@ int ceph_encode_encrypted_dname(struct inode *parent, struct qstr *d_name,
 		goto out;
 	}
 
-	ret = fscrypt_fname_encrypt(dir, &iname, cryptbuf, len);
+	ret = fscrypt_fname_encrypt(dir,
+				    &(struct qstr)QSTR_INIT(p, name_len),
+				    cryptbuf, len);
 	if (ret) {
 		elen = ret;
 		goto out;
@@ -331,18 +330,13 @@ int ceph_encode_encrypted_dname(struct inode *parent, struct qstr *d_name,
 	}
 
 	/* base64 encode the encrypted name */
-	elen = ceph_base64_encode(cryptbuf, len, buf);
-	doutc(cl, "base64-encoded ciphertext name = %.*s\n", elen, buf);
+	elen = ceph_base64_encode(cryptbuf, len, p);
+	doutc(cl, "base64-encoded ciphertext name = %.*s\n", elen, p);
 
 	/* To understand the 240 limit, see CEPH_NOHASH_NAME_MAX comments */
 	WARN_ON(elen > 240);
-	if ((elen > 0) && (dir != parent)) {
-		char tmp_buf[NAME_MAX];
-
-		elen = snprintf(tmp_buf, sizeof(tmp_buf), "_%.*s_%ld",
-				elen, buf, dir->i_ino);
-		memcpy(buf, tmp_buf, elen);
-	}
+	if (dir != parent) // leading _ is already there; append _<inum>
+		elen += 1 + sprintf(p + elen, "_%ld", dir->i_ino);
 
 out:
 	kfree(cryptbuf);
-- 
2.39.5