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 2B6E8171CD; Wed, 6 Nov 2024 12:15:20 +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=1730895321; cv=none; b=nBdkeRfZJle8nPnM58B4D1SYvBdfc3oUVSvVx/Czb4LUG+Di/WvHq/LnHlVALVOkzEbQ8kZShwEYcwpMmx/lq2d9f9VikJFYI9qc1wAfhUfMgjoWPNAtTW+0Sq03554b1GmXs6KsMg52T7TUv7bNKoozXkzZbmR278M8CXdK7eI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730895321; c=relaxed/simple; bh=7VZYTFrpoq1DDy7+iqNRZxeO261X6j+Xgr2m6MFregw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I5cnEqT989VMLyAQm7Gm2aA9kwAdfEdFX4bOxnl7WQwTHd/2tYWP6b7WukZxQwcT+OTXGoy/MwwCIjk9gDDay9B2ahIppm/d4zkQfgVaoUJphKxtvrlUfa36BiE1Znx0hE2+NqQrsN0QCJbvNCfyXhs2yYFpIL9oI5BCr3yv2Gg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SBMu3rKc; 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="SBMu3rKc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C354C4CECD; Wed, 6 Nov 2024 12:15:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730895320; bh=7VZYTFrpoq1DDy7+iqNRZxeO261X6j+Xgr2m6MFregw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SBMu3rKcqi08X0mhSA5sn+XMujVwhFioqt2RVrlf3+CrVH9QGZHGYsDWyN5j0XGAK Ue3aLTsBRWrp7fJ8l6C2oXYK5pKJ14p2zUXAzBsv7CtBkZW2e5kJK+EPLnd/GuAwac EEFYuBhiwOtSlAbkgeemWFG2SWjBROyXlV1stcL8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Ritesh Harjani (IBM)" , Mikhail Ukhin , Artem Sadovnikov , Theodore Tso , Sasha Levin Subject: [PATCH 4.19 179/350] ext4: fix i_data_sem unlock order in ext4_ind_migrate() Date: Wed, 6 Nov 2024 13:01:47 +0100 Message-ID: <20241106120325.353991202@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120320.865793091@linuxfoundation.org> References: <20241106120320.865793091@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Artem Sadovnikov [ Upstream commit cc749e61c011c255d81b192a822db650c68b313f ] Fuzzing reports a possible deadlock in jbd2_log_wait_commit. This issue is triggered when an EXT4_IOC_MIGRATE ioctl is set to require synchronous updates because the file descriptor is opened with O_SYNC. This can lead to the jbd2_journal_stop() function calling jbd2_might_wait_for_commit(), potentially causing a deadlock if the EXT4_IOC_MIGRATE call races with a write(2) system call. This problem only arises when CONFIG_PROVE_LOCKING is enabled. In this case, the jbd2_might_wait_for_commit macro locks jbd2_handle in the jbd2_journal_stop function while i_data_sem is locked. This triggers lockdep because the jbd2_journal_start function might also lock the same jbd2_handle simultaneously. Found by Linux Verification Center (linuxtesting.org) with syzkaller. Reviewed-by: Ritesh Harjani (IBM) Co-developed-by: Mikhail Ukhin Signed-off-by: Mikhail Ukhin Signed-off-by: Artem Sadovnikov Rule: add Link: https://lore.kernel.org/stable/20240404095000.5872-1-mish.uxin2012%40yandex.ru Link: https://patch.msgid.link/20240829152210.2754-1-ancowi69@gmail.com Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- fs/ext4/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c index 4a72583c75593..9f73c2f7f9492 100644 --- a/fs/ext4/migrate.c +++ b/fs/ext4/migrate.c @@ -678,8 +678,8 @@ int ext4_ind_migrate(struct inode *inode) ei->i_data[i] = cpu_to_le32(blk++); ext4_mark_inode_dirty(handle, inode); errout: - ext4_journal_stop(handle); up_write(&EXT4_I(inode)->i_data_sem); + ext4_journal_stop(handle); out_unlock: percpu_up_write(&sbi->s_writepages_rwsem); return ret; -- 2.43.0