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 E20AA175A99; Mon, 17 Aug 2026 14:56:18 +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=1786978580; cv=none; b=iDqz7gvryP1yybYVKmmicScfmhgcoNTsB23iv75CBgul5yBWVx7HJVcV5YLWhsPovM9yIN/i4ozUeExQ0kXYG0VK0G6s24gEqB1OVgxDDe8SEaUjSZBJfRAHB8YzzgVGHnfHlpTpsAhpZpfwe7E2VkLiYd7YM58/0toFV8BiPm0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786978580; c=relaxed/simple; bh=zsLpfmpOckoat5gIgygocPdDqIVbw/fMkXdPljzDAJE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ke79cjNvxaI0QPifKDeY/pue9RcNz+veLtmGocSasRjr0fLqH3Ap1ppRY7F9K3WeO8ZuMkC5CSGVNuKLMa4jAW6pQrqPcRy6nzl3SuOs1zEZH5LuBpNC6ogAS2T2rGopr8Nyfl6VQ6m5B5ggZ03B12qsqD/pzJld/MJwGFuVpf0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oGwujjd2; 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="oGwujjd2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 471C81F000E9; Mon, 17 Aug 2026 14:56:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786978578; bh=cdTRO1iklUG37u6EwZAkVD27rYPCs5P6ZnzOLI9CrQM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oGwujjd2hgOaHzjG0b2WpKx2KVxknYajLh/w2Rmq7HzBPnH6OjTn8QxKwMdMY8x4z xeT+D+vgEboZinnG1o97AbIdZ/PWecvFYf0m+jAkDQvDrUf9fvV9lQbYfJxQm1qO8I EXCbMl12Pw0U0rgbcMuTydwrvp+FPCJwrr3Fzu3Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kyle Zeng , David Lee , Julian Anastasov , Pablo Neira Ayuso Subject: [PATCH 6.6 078/156] ipvs: clear IPv4 options after rebasing tunnel ICMP errors Date: Mon, 17 Aug 2026 15:33:32 +0200 Message-ID: <20260817132537.649270631@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132534.666299318@linuxfoundation.org> References: <20260817132534.666299318@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: Kyle Zeng commit e0ba936287dfe9783426aac27e5fd76fe35b38c9 upstream. ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it to icmp_send(). However, IPCB(skb)->opt still describes the outer IPv4 header. A timestamp option in the outer header can therefore leave an offset that points into the quoted transport header after the rebase. __ip_options_echo() treats a byte at that stale location as the option length and copies it into the fixed-size option storage on the __icmp_send() stack, causing a stack out-of-bounds write. Clear the stale option metadata after resetting the network header. Keep the remaining control block fields, including the ingress interface used by the ICMP response path. Fixes: f2edb9f7706d ("ipvs: implement passive PMTUD for IPIP packets") Cc: stable@vger.kernel.org Assisted-by: Codex:gpt-5.6-sol Codex:gpt-5.5-cyber Signed-off-by: Kyle Zeng Co-developed-by: David Lee Signed-off-by: David Lee Acked-by: Julian Anastasov Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/ipvs/ip_vs_core.c | 1 + 1 file changed, 1 insertion(+) --- a/net/netfilter/ipvs/ip_vs_core.c +++ b/net/netfilter/ipvs/ip_vs_core.c @@ -1768,6 +1768,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, s if (pskb_pull(skb, offset2) == NULL) goto ignore_tunnel; skb_reset_network_header(skb); + memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); /* Ensure the IP header is present in headroom */ if (!pskb_may_pull(skb, hlen_orig)) goto ignore_tunnel;