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 DB62B1DE2A5; Tue, 8 Oct 2024 12:44:45 +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=1728391485; cv=none; b=CQk2NSQdGRtb9oFxvLDWB5YTA9rIW8jlY4HY4WDwrSX1KieGYtWY5Yg6lwa8NxForxb0KNjO2nmaJc+FTLfrhWyokCdfFWgQ5Utq7ZGJByzphjPy+wnCtGqciP+Ca2+OMvwa/UOI2NR62CaUE5+1ejC5Rlk+zLigI6IVOS3vmJE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728391485; c=relaxed/simple; bh=IkPb5hRgRSdgCoSG1Bdg3ekDJANEhRxav4n5PoxgOuI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hmCtytcXz2b9PVbpbfGUow0PNj9TevGYYzJTqdHYxI0M8afXOiNAIc0yyCQYUVV2iiYa0xb8lXi4JBsIwzhcA8CN7tLmb9J6yp3iYQoj4rwtt/yv8EKJomqIwHxPu5yd2Z0Rvffov3cAl97SOkGaMeezgtPJJkLHNIWKAEZfFQk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=KfU7rtUv; 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="KfU7rtUv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5FD34C4CEC7; Tue, 8 Oct 2024 12:44:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728391485; bh=IkPb5hRgRSdgCoSG1Bdg3ekDJANEhRxav4n5PoxgOuI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KfU7rtUv/94dkhJcZW2gcqI4RnAUfb6WpASJn67eOTDuqTOXNfRrdspdzphW0xPMu bFyxgMPDtwUgD6Om4bN5pHECXszZ7Tw+OjTTXzhgjVdm5qBRpS345SeaNwguVsir3u 7NkMfEmv1yKb0HqIZPar2gUmBZ9Z2SbIf7fKfQcc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ido Schimmel , Guillaume Nault , Paolo Abeni , Sasha Levin Subject: [PATCH 6.11 129/558] ipv4: Mask upper DSCP bits and ECN bits in NETLINK_FIB_LOOKUP family Date: Tue, 8 Oct 2024 14:02:39 +0200 Message-ID: <20241008115707.441567111@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241008115702.214071228@linuxfoundation.org> References: <20241008115702.214071228@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 6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ido Schimmel [ Upstream commit 8fed54758cd248cd311a2b5c1e180abef1866237 ] The NETLINK_FIB_LOOKUP netlink family can be used to perform a FIB lookup according to user provided parameters and communicate the result back to user space. However, unlike other users of the FIB lookup API, the upper DSCP bits and the ECN bits of the DS field are not masked, which can result in the wrong result being returned. Solve this by masking the upper DSCP bits and the ECN bits using IPTOS_RT_MASK. The structure that communicates the request and the response is not exported to user space, so it is unlikely that this netlink family is actually in use [1]. [1] https://lore.kernel.org/netdev/ZpqpB8vJU%2FQ6LSqa@debian/ Signed-off-by: Ido Schimmel Reviewed-by: Guillaume Nault Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/ipv4/fib_frontend.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index 7ad2cafb92763..da540ddb7af65 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -1343,7 +1343,7 @@ static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) struct flowi4 fl4 = { .flowi4_mark = frn->fl_mark, .daddr = frn->fl_addr, - .flowi4_tos = frn->fl_tos, + .flowi4_tos = frn->fl_tos & IPTOS_RT_MASK, .flowi4_scope = frn->fl_scope, }; struct fib_table *tb; -- 2.43.0