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 1E506186E5A; Wed, 3 Jul 2024 11:23:25 +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=1720005805; cv=none; b=tBKpbb8XHsAiw+LXUSJUQ63Q8X+rU6p4BGoqcWx9wUSf/vaT2f+ialkZbzWUzkT4etoGy2Xi6q/4iVS9BGyYjjn8z4dFTZq/UQt/2AxhVH7x43thK2AAPpz45rI5GTiU5Wx+sSUx3/oB2Sz/til87C2YaOoqzRIN0TiN05KPHSg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005805; c=relaxed/simple; bh=Qag7OV+aaVLPZbq2BAImU5W6CT795JnUqc0RTIb2PZk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Fyfgys+GwnacnjCUYARic2OUytwnryPp41W0EDisHsOXkF4RqBbKK5y6CrtA3iPuieWuYCFKY6Z4eHnbX5Damn9g6oZRxNrWUS0pZWykTtwcFabK2AYIJRrcCRTbq+u3eIm+kEAw9KJGLakfwgSd1t+x4xUHKP2i2VakyfbYB2g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EjMVrW51; 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="EjMVrW51" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8F4A0C2BD10; Wed, 3 Jul 2024 11:23:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720005805; bh=Qag7OV+aaVLPZbq2BAImU5W6CT795JnUqc0RTIb2PZk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EjMVrW51NVfKrqt4fJHiI9wEjBmE395eXmnkOY2C1tN6J7K1J9KwROlIQpkLvKtje dYhO9LpIb3A6aTAgxhXy4oBeXsQ5ZmG/5Ix3e3A2/52VZaBl85KCHNMaXJUZtV+fYv uIaYj/RYFqjiPAuiW7idfQDhEtJpvTPEyT4R95TQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+b62c37cdd58103293a5a@syzkaller.appspotmail.com, syzbot+cfbe1da5fdfc39efc293@syzkaller.appspotmail.com, kernel test robot , Jozsef Kadlecsik , Pablo Neira Ayuso , Sasha Levin Subject: [PATCH 5.15 202/356] netfilter: ipset: Fix suspicious rcu_dereference_protected() Date: Wed, 3 Jul 2024 12:38:58 +0200 Message-ID: <20240703102920.745866861@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703102913.093882413@linuxfoundation.org> References: <20240703102913.093882413@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jozsef Kadlecsik [ Upstream commit 8ecd06277a7664f4ef018abae3abd3451d64e7a6 ] When destroying all sets, we are either in pernet exit phase or are executing a "destroy all sets command" from userspace. The latter was taken into account in ip_set_dereference() (nfnetlink mutex is held), but the former was not. The patch adds the required check to rcu_dereference_protected() in ip_set_dereference(). Fixes: 4e7aaa6b82d6 ("netfilter: ipset: Fix race between namespace cleanup and gc in the list:set type") Reported-by: syzbot+b62c37cdd58103293a5a@syzkaller.appspotmail.com Reported-by: syzbot+cfbe1da5fdfc39efc293@syzkaller.appspotmail.com Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202406141556.e0b6f17e-lkp@intel.com Signed-off-by: Jozsef Kadlecsik Signed-off-by: Pablo Neira Ayuso Signed-off-by: Sasha Levin --- net/netfilter/ipset/ip_set_core.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/net/netfilter/ipset/ip_set_core.c b/net/netfilter/ipset/ip_set_core.c index 8819c28a0e491..f2f6b7325c706 100644 --- a/net/netfilter/ipset/ip_set_core.c +++ b/net/netfilter/ipset/ip_set_core.c @@ -53,12 +53,13 @@ MODULE_DESCRIPTION("core IP set support"); MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_IPSET); /* When the nfnl mutex or ip_set_ref_lock is held: */ -#define ip_set_dereference(p) \ - rcu_dereference_protected(p, \ +#define ip_set_dereference(inst) \ + rcu_dereference_protected((inst)->ip_set_list, \ lockdep_nfnl_is_held(NFNL_SUBSYS_IPSET) || \ - lockdep_is_held(&ip_set_ref_lock)) + lockdep_is_held(&ip_set_ref_lock) || \ + (inst)->is_deleted) #define ip_set(inst, id) \ - ip_set_dereference((inst)->ip_set_list)[id] + ip_set_dereference(inst)[id] #define ip_set_ref_netlink(inst,id) \ rcu_dereference_raw((inst)->ip_set_list)[id] #define ip_set_dereference_nfnl(p) \ @@ -1135,7 +1136,7 @@ static int ip_set_create(struct sk_buff *skb, const struct nfnl_info *info, if (!list) goto cleanup; /* nfnl mutex is held, both lists are valid */ - tmp = ip_set_dereference(inst->ip_set_list); + tmp = ip_set_dereference(inst); memcpy(list, tmp, sizeof(struct ip_set *) * inst->ip_set_max); rcu_assign_pointer(inst->ip_set_list, list); /* Make sure all current packets have passed through */ -- 2.43.0