linux-kernel - [PATCH 1/2] cifs: Do not issue SMB2 CREATE always with FILE_READ

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Message-Id: <20241005160826.20825-2-pali@kernel.org>
Date: Sat,  5 Oct 2024 18:08:25 +0200
From: Pali Rohár <pali@...nel.org>
To: Steve French <sfrench@...ba.org>,
	Paulo Alcantara <pc@...guebit.com>,
	Ronnie Sahlberg <ronniesahlberg@...il.com>
Cc: linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] cifs: Do not issue SMB2 CREATE always with FILE_READ_ATTRIBUTES

Not all SMB2 operations require FILE_READ_ATTRIBUTES access and therefore
do not automatically request for FILE_READ_ATTRIBUTES access in every one
SMB2 CREATE command.

This change allows to complete WRITE operation to a file when it does not
grant FILE_READ_ATTRIBUTES permission and its parent directory does not
grant READ_DATA permission (parent directory READ_DATA is implicit grant of
child FILE_READ_ATTRIBUTES permission).

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 fs/smb/client/smb2file.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/smb/client/smb2file.c b/fs/smb/client/smb2file.c
index 149449d9c1c0..faa634ce4d54 100644
--- a/fs/smb/client/smb2file.c
+++ b/fs/smb/client/smb2file.c
@@ -162,7 +162,6 @@ int smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32
 	if (smb2_path == NULL)
 		return -ENOMEM;
 
-	oparms->desired_access |= FILE_READ_ATTRIBUTES;
 	smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
 
 	rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL, &err_iov,
-- 
2.20.1