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 EACD7C7619A for ; Wed, 12 Apr 2023 08:41:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230478AbjDLIlb (ORCPT ); Wed, 12 Apr 2023 04:41:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231515AbjDLIko (ORCPT ); Wed, 12 Apr 2023 04:40:44 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26D1E72A8 for ; Wed, 12 Apr 2023 01:40:24 -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 dfw.source.kernel.org (Postfix) with ESMTPS id B07B9629E6 for ; Wed, 12 Apr 2023 08:39:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CAD7DC433EF; Wed, 12 Apr 2023 08:39:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681288779; bh=eNHfDyvvXn4PpOPv28aukeBF+WCIiEupDR1H02KaPB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=el6ZbI4+cQdC9pBcGqTelgjXwI5+j/3zIWB91bCFDqdzKrXbxEKZRo1g8idYVdAbt aAObyNgntAZT9sqzgqcx8GRCHR+0hiVFPr9P6p/qMzilf/5ta5jVMw79DiacuxU8KJ sRge1KDnJVTSfqlA6KepmFD6z3A0pCtFZ02ZgJA4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Orange Kao , Mike Snitzer , Sasha Levin Subject: [PATCH 6.1 004/164] dm: fix improper splitting for abnormal bios Date: Wed, 12 Apr 2023 10:32:06 +0200 Message-Id: <20230412082836.949089010@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230412082836.695875037@linuxfoundation.org> References: <20230412082836.695875037@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mike Snitzer [ Upstream commit f7b58a69fad9d2c4c90cab0247811155dd0d48e7 ] "Abnormal" bios include discards, write zeroes and secure erase. By no longer passing the calculated 'len' pointer, commit 7dd06a2548b2 ("dm: allow dm_accept_partial_bio() for dm_io without duplicate bios") took a senseless approach to disallowing dm_accept_partial_bio() from working for duplicate bios processed using __send_duplicate_bios(). It inadvertently and incorrectly stopped the use of 'len' when initializing a target's io (in alloc_tio). As such the resulting tio could address more area of a device than it should. For example, when discarding an entire DM striped device with the following DM table: vg-lvol0: 0 159744 striped 2 128 7:0 2048 7:1 2048 vg-lvol0: 159744 45056 striped 2 128 7:2 2048 7:3 2048 Before this fix: device-mapper: striped: target_stripe=0, bdev=7:0, start=2048 len=102400 blkdiscard: attempt to access beyond end of device loop0: rw=2051, sector=2048, nr_sectors = 102400 limit=81920 device-mapper: striped: target_stripe=1, bdev=7:1, start=2048 len=102400 blkdiscard: attempt to access beyond end of device loop1: rw=2051, sector=2048, nr_sectors = 102400 limit=81920 After this fix; device-mapper: striped: target_stripe=0, bdev=7:0, start=2048 len=79872 device-mapper: striped: target_stripe=1, bdev=7:1, start=2048 len=79872 Fixes: 7dd06a2548b2 ("dm: allow dm_accept_partial_bio() for dm_io without duplicate bios") Cc: stable@vger.kernel.org Reported-by: Orange Kao Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/dm.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 5e6584cc76c33..24284d22f15bc 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1475,7 +1475,8 @@ static void setup_split_accounting(struct clone_info *ci, unsigned int len) } static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, - struct dm_target *ti, unsigned int num_bios) + struct dm_target *ti, unsigned int num_bios, + unsigned *len) { struct bio *bio; int try; @@ -1486,7 +1487,7 @@ static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci, if (try) mutex_lock(&ci->io->md->table_devices_lock); for (bio_nr = 0; bio_nr < num_bios; bio_nr++) { - bio = alloc_tio(ci, ti, bio_nr, NULL, + bio = alloc_tio(ci, ti, bio_nr, len, try ? GFP_NOIO : GFP_NOWAIT); if (!bio) break; @@ -1524,7 +1525,7 @@ static int __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti, if (len) setup_split_accounting(ci, *len); /* dm_accept_partial_bio() is not supported with shared tio->len_ptr */ - alloc_multiple_bios(&blist, ci, ti, num_bios); + alloc_multiple_bios(&blist, ci, ti, num_bios, len); while ((clone = bio_list_pop(&blist))) { dm_tio_set_flag(clone_to_tio(clone), DM_TIO_IS_DUPLICATE_BIO); __map_bio(clone); -- 2.39.2