From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D068403B13; Tue, 21 Jul 2026 20:26:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784665612; cv=none; b=l67uXsnAiwjBV56n0qdiP0wYGqG55j8JsGt3qcpLuyPtFxyaZzItvByP0IDe8MaFtzXQpw0uQxovM1VMhTOUGASFd4JVqzlgFBLcYSsbJD9iOPLMz6B5AV5gYOIxgsm0F5XBpWIICQJrjp9RVnDaYbzbSMu/fI5gFitfCFxMY+w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784665612; c=relaxed/simple; bh=A6b9+p+g3fVX88YQ0Ur4+IcJtHuHZZv5jGQrj7iqjeQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t/J2vw1iAlbPHmldqSjMFLPJUdIuEoxgkE7zm/Gyn6gxdiF6HfzE++3IbYhAd3ZUjyljzpod8v5Dil4HFQDk57zXSFWGFi6VWDCJvADjax5UNiZvnbpQP1A6ybOiwipOWdLyE7j9a8Vvi30V78nWDTn8svoKx7xwNPYGHFcwF0Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oShfjIwg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="oShfjIwg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA5821F000E9; Tue, 21 Jul 2026 20:26:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784665610; bh=7WnYI3pv4yJe+Abh6QKQ7tKe4T41SjFwcadXkVTrDuU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oShfjIwg49XQ/NJl0vtQobFx0CvcQEyIDHFRJzniI49gKNIPAOi8hJNQhoLAsuq4x BD0i3y4fPwesS/Ouy3jg9ckmRtzUxm3hndKY5OXGl19lLPCwEZFWnTWpzTPfniLqbI mgYQgX4WcZ0bsueVuXZR2c43amqh7kaZcBRcax1E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Steve French , ChenXiaoSong , Namjae Jeon , Sasha Levin Subject: [PATCH 6.6 0326/1266] smb/server: do not require delete access for non-replacing links Date: Tue, 21 Jul 2026 17:12:43 +0200 Message-ID: <20260721152449.129998685@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152441.786066624@linuxfoundation.org> References: <20260721152441.786066624@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: ChenXiaoSong [ Upstream commit 851ed9e09639e0daf79a506ce26097b296ed5518 ] Reproducer: 1. server: systemctl start ksmbd 2. client: mount -t cifs //${server_ip}/export /mnt 3. client: touch /mnt/file; ln /mnt/file /mnt/hardlink 4. client err log: ln: failed to create hard link 'hardlink' => 'file': Permission denied 5. server err log: ksmbd: no right to delete : 0x80 Fixes: 13f3942f2bf4 ("ksmbd: add per-handle permission check to FILE_LINK_INFORMATION") Cc: stable@vger.kernel.org Reported-by: Steve French Signed-off-by: ChenXiaoSong Acked-by: Namjae Jeon Signed-off-by: Steve French Signed-off-by: Sasha Levin --- fs/smb/server/smb2pdu.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index 968b1b5d858fb7..fafbb4275bba4d 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -6504,16 +6504,18 @@ static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp, } case FILE_LINK_INFORMATION: { - if (!(fp->daccess & FILE_DELETE_LE)) { - pr_err("no right to delete : 0x%x\n", fp->daccess); - return -EACCES; - } + struct smb2_file_link_info *file_info; if (buf_len < sizeof(struct smb2_file_link_info)) return -EINVAL; - return smb2_create_link(work, work->tcon->share_conf, - (struct smb2_file_link_info *)buffer, + file_info = (struct smb2_file_link_info *)buffer; + if (file_info->ReplaceIfExists && !(fp->daccess & FILE_DELETE_LE)) { + pr_err("no right to delete : 0x%x\n", fp->daccess); + return -EACCES; + } + + return smb2_create_link(work, work->tcon->share_conf, file_info, buf_len, fp->filp, work->conn->local_nls); } -- 2.53.0