From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 CCF4D188CC1; Tue, 10 Sep 2024 09:39:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725961145; cv=none; b=DAEhcqZzISZG9vnDrXh5wKE9u6SUVzoW9vT+59YD9E3Vm4dwim2OdI1vdRSi4g2EqpjGlcctMBdwf+M5bgoDTIxIdidC1BxPl/KGJQSAN1uyA90/p7G+hCWrQgmwkxJ76vE6GolLTszZ309GxS/fA6Fon4btOXJrD2pLWtiWVL8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725961145; c=relaxed/simple; bh=s5sMqgvBgxMphbkMJ/6+ZvwMLfHSHMNEXz3LJ1PF2aQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nJqzMwJAY/tT6Rl9ce0ZoaMBfCrorDwLxDWxTZnsi+5zdMP6U7dlYaoQQNwoqiIQ3cLYw9IREpS8LKZ9yoDuAqs6bsI0FpWOrk02QyJeYu5SueQd6Fx7afZgiABp9NnQSiLfmyT0ND9J3vy+AQIDaqEKmBe+wceB3obrDquslDo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UgAdbEd/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UgAdbEd/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 54F69C4CEC3; Tue, 10 Sep 2024 09:39:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1725961145; bh=s5sMqgvBgxMphbkMJ/6+ZvwMLfHSHMNEXz3LJ1PF2aQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UgAdbEd/zfxW5jwBERGJt5K1PFstPZLwEybtKR9jooSPM9FEbRg2plloHDGjFZ0E2 vPVPZnEgnBsook8rbPen3wSBI3TOVN0RsoNimnnAvt/VSk2cjbAKVY+4cIV91tV49V 1P4tEEEoDVjrH6iRPrTkL5uCMz2BF68S8tEm6cpw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Oliver Neukum , Simon Horman , Jakub Kicinski , Sasha Levin Subject: [PATCH 4.19 41/96] usbnet: modern method to get random MAC Date: Tue, 10 Sep 2024 11:31:43 +0200 Message-ID: <20240910092543.334987980@linuxfoundation.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240910092541.383432924@linuxfoundation.org> References: <20240910092541.383432924@linuxfoundation.org> User-Agent: quilt/0.67 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 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Oliver Neukum [ Upstream commit bab8eb0dd4cb995caa4a0529d5655531c2ec5e8e ] The driver generates a random MAC once on load and uses it over and over, including on two devices needing a random MAC at the same time. Jakub suggested revamping the driver to the modern API for setting a random MAC rather than fixing the old stuff. The bug is as old as the driver. Signed-off-by: Oliver Neukum Reviewed-by: Simon Horman Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Link: https://patch.msgid.link/20240829175201.670718-1-oneukum@suse.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/usb/usbnet.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 16225654d88c..938335f4738d 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -79,9 +79,6 @@ /*-------------------------------------------------------------------------*/ -// randomly generated ethernet address -static u8 node_id [ETH_ALEN]; - /* use ethtool to change the level for any given device */ static int msg_level = -1; module_param (msg_level, int, 0); @@ -1725,7 +1722,6 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) dev->net = net; strscpy(net->name, "usb%d", sizeof(net->name)); - eth_hw_addr_set(net, node_id); /* rx and tx sides can use different message sizes; * bind() should set rx_urb_size in that case. @@ -1799,9 +1795,9 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) goto out4; } - /* let userspace know we have a random address */ - if (ether_addr_equal(net->dev_addr, node_id)) - net->addr_assign_type = NET_ADDR_RANDOM; + /* this flags the device for user space */ + if (!is_valid_ether_addr(net->dev_addr)) + eth_hw_addr_random(net); if ((dev->driver_info->flags & FLAG_WLAN) != 0) SET_NETDEV_DEVTYPE(net, &wlan_type); @@ -2211,7 +2207,6 @@ static int __init usbnet_init(void) BUILD_BUG_ON( FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); - eth_random_addr(node_id); return 0; } module_init(usbnet_init); -- 2.43.0