From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46DF2C28CC0 for ; Thu, 30 May 2019 03:21:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 20793249CB for ; Thu, 30 May 2019 03:21:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186491; bh=kZgH4ohd/JCOkYrr98dTx2BYvQS4mgwfleEWQyRwmdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lh5JTMUkwoaVTUB9VFHIhPfRwNhrhtyxkeE+iWkOV6irFSAUjx5/9e83Mue4kd1tU 3zxpjOp2PB6IzOt5EHKxQPVS5uJAMjC5yr5ACGDcHZB3PmayNUaAfs2MUksmma3+9C SD5xppinbQPG7x81orgyXOXX1zNMrtzXMdyRkInQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730949AbfE3DVa (ORCPT ); Wed, 29 May 2019 23:21:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:42334 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730664AbfE3DQY (ORCPT ); Wed, 29 May 2019 23:16:24 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 06EAD245C4; Thu, 30 May 2019 03:16:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186183; bh=kZgH4ohd/JCOkYrr98dTx2BYvQS4mgwfleEWQyRwmdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xPiwxyA0ZsOnvE9NJXquIhlKCmFNtlQTTa05GObxwXOPkC6mQ2a5bIjFaU7JM4nls BgsEYcbVI07wpkSjj8sE678uahM6NPrt/9ytrK/i6imQcuxov8APoTyiz8gR9VhBiu YDUArZONHVuBtBBdvuECOLM6pjOF2K2aSRuUAduU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ross Lagerwall , Andreas Gruenbacher , Bob Peterson , Sasha Levin Subject: [PATCH 4.19 048/276] gfs2: Fix occasional glock use-after-free Date: Wed, 29 May 2019 20:03:26 -0700 Message-Id: <20190530030527.809936548@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030523.133519668@linuxfoundation.org> References: <20190530030523.133519668@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 9287c6452d2b1f24ea8e84bd3cf6f3c6f267f712 ] This patch has to do with the life cycle of glocks and buffers. When gfs2 metadata or journaled data is queued to be written, a gfs2_bufdata object is assigned to track the buffer, and that is queued to various lists, including the glock's gl_ail_list to indicate it's on the active items list. Once the page associated with the buffer has been written, it is removed from the ail list, but its life isn't over until a revoke has been successfully written. So after the block is written, its bufdata object is moved from the glock's gl_ail_list to a file-system-wide list of pending revokes, sd_log_le_revoke. At that point the glock still needs to track how many revokes it contributed to that list (in gl_revokes) so that things like glock go_sync can ensure all the metadata has been not only written, but also revoked before the glock is granted to a different node. This is to guarantee journal replay doesn't replay the block once the glock has been granted to another node. Ross Lagerwall recently discovered a race in which an inode could be evicted, and its glock freed after its ail list had been synced, but while it still had unwritten revokes on the sd_log_le_revoke list. The evict decremented the glock reference count to zero, which allowed the glock to be freed. After the revoke was written, function revoke_lo_after_commit tried to adjust the glock's gl_revokes counter and clear its GLF_LFLUSH flag, at which time it referenced the freed glock. This patch fixes the problem by incrementing the glock reference count in gfs2_add_revoke when the glock's first bufdata object is moved from the glock to the global revokes list. Later, when the glock's last such bufdata object is freed, the reference count is decremented. This guarantees that whichever process finishes last (the revoke writing or the evict) will properly free the glock, and neither will reference the glock after it has been freed. Reported-by: Ross Lagerwall Signed-off-by: Andreas Gruenbacher Signed-off-by: Bob Peterson Signed-off-by: Sasha Levin --- fs/gfs2/glock.c | 1 + fs/gfs2/log.c | 3 ++- fs/gfs2/lops.c | 6 ++++-- 3 files changed, 7 insertions(+), 3 deletions(-) diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 775256141e9fb..ccdd8c821abd7 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -140,6 +140,7 @@ void gfs2_glock_free(struct gfs2_glock *gl) { struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; + BUG_ON(atomic_read(&gl->gl_revokes)); rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms); smp_mb(); wake_up_glock(gl); diff --git a/fs/gfs2/log.c b/fs/gfs2/log.c index ee20ea42e7b59..cd85092723dea 100644 --- a/fs/gfs2/log.c +++ b/fs/gfs2/log.c @@ -604,7 +604,8 @@ void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) bd->bd_bh = NULL; bd->bd_ops = &gfs2_revoke_lops; sdp->sd_log_num_revoke++; - atomic_inc(&gl->gl_revokes); + if (atomic_inc_return(&gl->gl_revokes) == 1) + gfs2_glock_hold(gl); set_bit(GLF_LFLUSH, &gl->gl_flags); list_add(&bd->bd_list, &sdp->sd_log_le_revoke); } diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c index f2567f958d002..8f99b395d7bf6 100644 --- a/fs/gfs2/lops.c +++ b/fs/gfs2/lops.c @@ -662,8 +662,10 @@ static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr) bd = list_entry(head->next, struct gfs2_bufdata, bd_list); list_del_init(&bd->bd_list); gl = bd->bd_gl; - atomic_dec(&gl->gl_revokes); - clear_bit(GLF_LFLUSH, &gl->gl_flags); + if (atomic_dec_return(&gl->gl_revokes) == 0) { + clear_bit(GLF_LFLUSH, &gl->gl_flags); + gfs2_glock_queue_put(gl); + } kmem_cache_free(gfs2_bufdata_cachep, bd); } } -- 2.20.1