From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794585634; b=vOYIvRv7icLdfKvqWq/QWIFfp+rlKa8d/x3726SAXVMqP5UIx6yE4GcF36i1zeRt9JJU bQfY3N5EUD9fGq6OOu3LVwKic3TUMXSQRm7ry8WGnxhcRjsR8Sg4imkIgaDFhqqV+X99Z w0vJo2dFHqwaROpbnK+Yq/BqGLBO2pH1Iixwr7G+qJl3Os3Qa8eQC3kIcHoMwjVZqvUCY Do/U9DmhfVwckPibdHcyRwS6pRuXfjpZv4Rff0gLH80tp68oWNdht6LRX3VlQjO1JCE3O Q920HMkNyt1zMqQM0dNm+6UShUecMcQG4NDbgI+SgVjTV/JnDFjVC07ptcIstGnBAfg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794585634; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=kPilUh5RjBKjN2QPWwNoPUW/0JCCAqoKe4G0hqjbmdQ=; b=jcBZ/sx/7ci6EJj5zDhklaFN+PLPBZt2q/b1/rU/WXgDFnyaoLyvIOQt7th9nq42Vmtw 14EgdHppqIYFQnr/ql04rjdclm9OlF3fXAQMdy8L+QPcB7vBFJukuFi4p0hE13tFLo184 cWleX6yUNAF78Gf9yq7fkfjSidt0tj1XpVVl77Tk68nXnKWdKfiSYIMDf1qeCWCyysUVV T3m6yzDe66cZU490f6nue9kHeTTKxRJAplsddmomHZASwN741FkN02xyf6KMfT8OyY3ec /JPHE3ysfa/fFnHO1kWNgSOCTwtivBKu9yebCvB7Nm87kJFjKfARkubl+0lmdsOtOcQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=u1LzN7ZB; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D586F6072306; Fri, 13 Nov 2026 16:00:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=u1LzN7ZB Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86B681F000C9; Fri, 13 Nov 2026 16:00:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794585634; bh=kPilUh5RjBKjN2QPWwNoPUW/0JCCAqoKe4G0hqjbmdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=u1LzN7ZB3mGnBKlxEhtI7BHS0+JEYaxzAl5IXLQ4HaWgDYzlnogIPtDZBsjbigi6G rutt1npc3Rag0wlj1tAxGUxvpCalf49suC2nG688wjo0RpIX9IAOgmbPTGo3bl5DZp umW8hIo1Y7PsDPCbRR7nF/cAQhynYKGbOXrVG+QM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Cen Zhang , Andrew Morton , Joseph Qi , Mark Fasheh , Joel Becker , Heming Zhao , Jia-Ju Bai , jjzuming@gmail.com, Sasha Levin Subject: [PATCH 7.3 254/507] ocfs2: validate move extents against a stable EOF Date: Fri, 13 Nov 2026 10:49:18 -0500 Message-ID: <20261113153803.163631104@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261113153753.358973689@linuxfoundation.org> References: <20261113153753.358973689@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Cen Zhang [ Upstream commit 84db6619cb702c37cf848b450c21b9c9706b0775 ] The move-extents range must be bounded by the inode size used for extent movement. ocfs2_ioctl_move_extents() checks and clamps the request before taking the local inode and cluster locks in ocfs2_move_extents(). It also uses separate i_size_read() calls for the range check and subtraction. A concurrent truncate can invalidate the first check and make the later unsigned subtraction underflow: Move-extents ioctl Truncate ------------------ -------- check me_start <= i_size take inode and cluster locks shrink EOF below me_start release locks compare me_start + me_len with EOF set me_len = EOF - me_start [unsigned underflow] acquire inode and cluster locks select extents using the bad range A truncate after clamping can also leave the range extending beyond EOF. Conversely, the cached size may be smaller than the size refreshed when the cluster inode lock is acquired. Early validation can then reject a valid start or permanently shorten the requested length and threshold. The me_start + me_len comparison can also wrap for a large input length. Validate and adjust the original request once, after inode_lock(), the exclusive rw lock and ocfs2_inode_lock() have stabilized and refreshed the size. Read EOF once, reject a start beyond it, and bound the length by EOF minus start. Normalize the threshold using the same EOF snapshot. This keeps zero as the default-threshold sentinel until validation uses the size that will govern extent movement. Move goal validation after range adjustment as well. Its allocation-group capacity check uses me_len and must see the EOF-clamped length. Both validation failures use the existing inode-lock unwind path before any extent movement or transaction starts. Range errors now reach the ioctl's normal copyout path, as goal errors already did. Unlike the old early rejection, a failed copyout can therefore override -EINVAL with -EFAULT. Link: https://lore.kernel.org/pm-ocfs2-move-extents-isize-rrw-v6-395bdee84ea81149068e@gmail.com Fixes: 53069d4e7695 ("Ocfs2/move_extents: move/defrag extents within a certain range.") Signed-off-by: Cen Zhang Signed-off-by: Andrew Morton Suggested-by: Joseph Qi Reviewed-by: Joseph Qi Assisted-by: LLM Cc: Mark Fasheh Cc: Joel Becker Cc: Heming Zhao Cc: Jia-Ju Bai Cc: Cc: A truncate after clamping can also leave the range extending beyond EOF. Conversely, the cached size may be smaller than the size refreshed when the cluster inode lock is acquired. Early validation can then reject a valid start or permanently shorten the requested length and threshold. The me_start + me_len comparison can also wrap for a large input length. Validate and adjust the original request once, after inode_lock(), the exclusive rw lock and ocfs2_inode_lock() have stabilized and refreshed the size. Read EOF once, reject a start beyond it, and bound the length by EOF minus start. Normalize the threshold using the same EOF snapshot. Signed-off-by: Sasha Levin --- fs/ocfs2/move_extents.c | 70 +++++++++++++++++++++++------------------ 1 file changed, 39 insertions(+), 31 deletions(-) diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c index ad1678ee7cc46..93b45531bf7d8 100644 --- a/fs/ocfs2/move_extents.c +++ b/fs/ocfs2/move_extents.c @@ -907,6 +907,30 @@ static int __ocfs2_move_extents_range(struct buffer_head *di_bh, return ret; } +static int ocfs2_validate_and_adjust_move_range(struct inode *inode, + struct ocfs2_move_extents *range) +{ + u64 i_size = i_size_read(inode); + + if (range->me_start > i_size) + return -EINVAL; + + if (range->me_len > i_size - range->me_start) + range->me_len = i_size - range->me_start; + + /* + * The default threshold for defragmentation is 1 MiB, which + * matches the maximum OCFS2 cluster size. + */ + if (!range->me_threshold) + range->me_threshold = 1024 * 1024; + + if (range->me_threshold > i_size) + range->me_threshold = i_size; + + return 0; +} + static int ocfs2_move_extents(struct ocfs2_move_extents_context *context) { int status; @@ -936,6 +960,21 @@ static int ocfs2_move_extents(struct ocfs2_move_extents_context *context) goto out_rw_unlock; } + status = ocfs2_validate_and_adjust_move_range(inode, context->range); + if (status) { + mlog_errno(status); + goto out_inode_unlock; + } + + /* The goal check depends on the adjusted range length. */ + if (!context->auto_defrag) { + status = ocfs2_validate_and_adjust_move_goal(inode, context->range); + if (status) { + mlog_errno(status); + goto out_inode_unlock; + } + } + /* * remember ip_xattr_sem also needs to be held if necessary */ @@ -1028,27 +1067,8 @@ int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp) goto out_free; } - if (range.me_start > i_size_read(inode)) { - status = -EINVAL; - goto out_free; - } - - if (range.me_start + range.me_len > i_size_read(inode)) - range.me_len = i_size_read(inode) - range.me_start; - context->range = ⦥ - /* - * ok, the default threshold for the defragmentation - * is 1M, since our maximum clustersize was 1M also. - * any thought? - */ - if (!range.me_threshold) - range.me_threshold = 1024 * 1024; - - if (range.me_threshold > i_size_read(inode)) - range.me_threshold = i_size_read(inode); - if (range.me_flags & ~(OCFS2_MOVE_EXT_FL_AUTO_DEFRAG | OCFS2_MOVE_EXT_FL_PART_DEFRAG)) { status = -EINVAL; @@ -1060,23 +1080,11 @@ int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp) if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG) context->partial = 1; - } else { - /* - * first best-effort attempt to validate and adjust the goal - * (physical address in block), while it can't guarantee later - * operation can succeed all the time since global_bitmap may - * change a bit over time. - */ - - status = ocfs2_validate_and_adjust_move_goal(inode, &range); - if (status) - goto out_copy; } status = ocfs2_move_extents(context); if (status) mlog_errno(status); -out_copy: /* * movement/defragmentation may end up being partially completed, * that's the reason why we need to return userspace the finished -- 2.53.0