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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6739C43334 for ; Tue, 7 Jun 2022 21:36:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1380309AbiFGVfB (ORCPT ); Tue, 7 Jun 2022 17:35:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376332AbiFGUjM (ORCPT ); Tue, 7 Jun 2022 16:39:12 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D417414B2E5; Tue, 7 Jun 2022 11:38:21 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 99CE5B8237E; Tue, 7 Jun 2022 18:38:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8BCFC385A5; Tue, 7 Jun 2022 18:38:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654627094; bh=FjpVwRVNYYlAGn7k/OHLaxc52wPen+gS9TwWMFYhhXE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q8DH7MF/DKLab7tRQrpkuxOS9KbddWcsscS8rzhh8gpjt2Hr/10ZFLicZmj47k4SH l5rXm0iexvddNerNHaUfvUtiedpCwwJ+qXn6WdD+7OvdhcabPlT8Zb2bxZnpVwFmfR pIaig3VnHUQDrpSlawSwxXIgslVrOovHQmEVmJjs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, stable@kernel.org, Chao Yu , Jaegeuk Kim Subject: [PATCH 5.17 616/772] f2fs: fix fallocate to use file_modified to update permissions consistently Date: Tue, 7 Jun 2022 19:03:28 +0200 Message-Id: <20220607165007.090617196@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607164948.980838585@linuxfoundation.org> References: <20220607164948.980838585@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: Chao Yu commit 958ed92922028ec67f504dcdc72bfdfd0f43936a upstream. This patch tries to fix permission consistency issue as all other mainline filesystems. Since the initial introduction of (posix) fallocate back at the turn of the century, it has been possible to use this syscall to change the user-visible contents of files. This can happen by extending the file size during a preallocation, or through any of the newer modes (punch, zero, collapse, insert range). Because the call can be used to change file contents, we should treat it like we do any other modification to a file -- update the mtime, and drop set[ug]id privileges/capabilities. The VFS function file_modified() does all this for us if pass it a locked inode, so let's make fallocate drop permissions correctly. Cc: stable@kernel.org Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman --- fs/f2fs/file.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1774,6 +1774,10 @@ static long f2fs_fallocate(struct file * inode_lock(inode); + ret = file_modified(file); + if (ret) + goto out; + if (mode & FALLOC_FL_PUNCH_HOLE) { if (offset >= inode->i_size) goto out;