Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1396C433EF for ; Wed, 24 Nov 2021 13:38:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1353389AbhKXNmC (ORCPT ); Wed, 24 Nov 2021 08:42:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:60378 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350257AbhKXNji (ORCPT ); Wed, 24 Nov 2021 08:39:38 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 436CD6320F; Wed, 24 Nov 2021 12:56:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637758602; bh=IKwPofgKLC48bMDR5dDV0wr4niRdtc3cnrk94Doc37o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cijY2T34Oh3iRk0G57X4Z+KaQk8VH9y8w+N4CsvOdW5SPswZJ0z9va+D8ogm6NLyU zsxBWRPxlzNLt4yzoq3z8m2nWtHANAxrCYDQbiY771C9FIjhawjq+TbCc/UblUH1t4 t4dYLrI1hZDKAEUcoXPMKB0UFrgd/JtzsXVpqMUg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Manfred Spraul , Alexander Mikhalitsyn , "Eric W. Biederman" , Davidlohr Bueso , Andrei Vagin , Pavel Tikhomirov , Vasily Averin , Andrew Morton , Linus Torvalds Subject: [PATCH 5.10 124/154] ipc: WARN if trying to remove ipc object which is absent Date: Wed, 24 Nov 2021 12:58:40 +0100 Message-Id: <20211124115706.297751155@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115702.361983534@linuxfoundation.org> References: <20211124115702.361983534@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexander Mikhalitsyn commit 126e8bee943e9926238c891e2df5b5573aee76bc upstream. Patch series "shm: shm_rmid_forced feature fixes". Some time ago I met kernel crash after CRIU restore procedure, fortunately, it was CRIU restore, so, I had dump files and could do restore many times and crash reproduced easily. After some investigation I've constructed the minimal reproducer. It was found that it's use-after-free and it happens only if sysctl kernel.shm_rmid_forced = 1. The key of the problem is that the exit_shm() function not handles shp's object destroy when task->sysvshm.shm_clist contains items from different IPC namespaces. In most cases this list will contain only items from one IPC namespace. How can this list contain object from different namespaces? The exit_shm() function is designed to clean up this list always when process leaves IPC namespace. But we made a mistake a long time ago and did not add a exit_shm() call into the setns() syscall procedures. The first idea was just to add this call to setns() syscall but it obviously changes semantics of setns() syscall and that's userspace-visible change. So, I gave up on this idea. The first real attempt to address the issue was just to omit forced destroy if we meet shp object not from current task IPC namespace [1]. But that was not the best idea because task->sysvshm.shm_clist was protected by rwsem which belongs to current task IPC namespace. It means that list corruption may occur. Second approach is just extend exit_shm() to properly handle shp's from different IPC namespaces [2]. This is really non-trivial thing, I've put a lot of effort into that but not believed that it's possible to make it fully safe, clean and clear. Thanks to the efforts of Manfred Spraul working an elegant solution was designed. Thanks a lot, Manfred! Eric also suggested the way to address the issue in ("[RFC][PATCH] shm: In shm_exit destroy all created and never attached segments") Eric's idea was to maintain a list of shm_clists one per IPC namespace, use lock-less lists. But there is some extra memory consumption-related concerns. An alternative solution which was suggested by me was implemented in ("shm: reset shm_clist on setns but omit forced shm destroy"). The idea is pretty simple, we add exit_shm() syscall to setns() but DO NOT destroy shm segments even if sysctl kernel.shm_rmid_forced = 1, we just clean up the task->sysvshm.shm_clist list. This chages semantics of setns() syscall a little bit but in comparision to the "naive" solution when we just add exit_shm() without any special exclusions this looks like a safer option. [1] https://lkml.org/lkml/2021/7/6/1108 [2] https://lkml.org/lkml/2021/7/14/736 This patch (of 2): Let's produce a warning if we trying to remove non-existing IPC object from IPC namespace kht/idr structures. This allows us to catch possible bugs when the ipc_rmid() function was called with inconsistent struct ipc_ids*, struct kern_ipc_perm* arguments. Link: https://lkml.kernel.org/r/20211027224348.611025-1-alexander.mikhalitsyn@virtuozzo.com Link: https://lkml.kernel.org/r/20211027224348.611025-2-alexander.mikhalitsyn@virtuozzo.com Co-developed-by: Manfred Spraul Signed-off-by: Manfred Spraul Signed-off-by: Alexander Mikhalitsyn Cc: "Eric W. Biederman" Cc: Davidlohr Bueso Cc: Greg KH Cc: Andrei Vagin Cc: Pavel Tikhomirov Cc: Vasily Averin Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- ipc/util.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/ipc/util.c +++ b/ipc/util.c @@ -446,8 +446,8 @@ static int ipcget_public(struct ipc_name static void ipc_kht_remove(struct ipc_ids *ids, struct kern_ipc_perm *ipcp) { if (ipcp->key != IPC_PRIVATE) - rhashtable_remove_fast(&ids->key_ht, &ipcp->khtnode, - ipc_kht_params); + WARN_ON_ONCE(rhashtable_remove_fast(&ids->key_ht, &ipcp->khtnode, + ipc_kht_params)); } /** @@ -462,7 +462,7 @@ void ipc_rmid(struct ipc_ids *ids, struc { int idx = ipcid_to_idx(ipcp->id); - idr_remove(&ids->ipcs_idr, idx); + WARN_ON_ONCE(idr_remove(&ids->ipcs_idr, idx) != ipcp); ipc_kht_remove(ids, ipcp); ids->in_use--; ipcp->deleted = true;