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=-5.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 644F4C2BA83 for ; Wed, 12 Feb 2020 17:40:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 372552073C for ; Wed, 12 Feb 2020 17:40:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="dVeiDX04" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728576AbgBLRkd (ORCPT ); Wed, 12 Feb 2020 12:40:33 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:33187 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726728AbgBLRkd (ORCPT ); Wed, 12 Feb 2020 12:40:33 -0500 Received: by mail-wr1-f68.google.com with SMTP id u6so3472402wrt.0 for ; Wed, 12 Feb 2020 09:40:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:mime-version:content-disposition :user-agent; bh=F5ZTwP5u+x69l52vZ6Yyj25MwyIu5EIbeHVmFxpD+fY=; b=dVeiDX04U8d+XNLfQD+pWt/fqqC8rogHA18ckgOfJKVtuwkUMez97024wLXgC+5fnD ChjKlh4V5CPA/hQ/NW38EQggMSCuMotJY15XKheE+NlvdxZo9QBZodirGpCAdO/bYcWQ 0umq+GEilDiEWCIZBi61MGInrf+7gM/7H0W7dqTQJPk1/U0kb23bwDovmCEBo9tzcJVn pe1khX+pI/AZVqb/SNd7j74jgolHc3WUXQ2RLXPVn1uzuGnwwun48YPc9Uix7ou7smj6 nWHmTtAds6l4MlWzcTDBDnygbPgKH0lm0cjzDHRSinPjeTCZeU5DnqxFzaSw78a5e6ox Exeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition:user-agent; bh=F5ZTwP5u+x69l52vZ6Yyj25MwyIu5EIbeHVmFxpD+fY=; b=Wy2RFoZIRNOn2pGShR57WhwoBaWZ/db5nYL6aep+7Brq0zFDFUrIwZ4rBVfMZw94MC SvQBB1MrDaM7ZiRv02JTtJLmAzTV7dg6G0s7aD+ZnBWQnp7VQV/K2wCOpnuIj+2AmQeB QRG1p5xkwitt27CwYyp071NlBzPUmjNDr0dGLN5xuSpyEbvxZsmGFP1h8Z8F0dLg39Gp PJs4QbfPJ7gtkPnXhkMhyXFH2/ExTKmMCdTNFxLPo36upd0iivNObB050Op8mKMfc60t 5y4ZLJ5DB4dXjfNv8Qf0PqsFp2JNrgeUE9AjQ+C4spKssgBZ9aPPTEbW2neG3XbGsGiM XwRw== X-Gm-Message-State: APjAAAUNVTHcCC6VbMuN7pvwVRlZhQd0ouaTqYLARObw4OG8hibvRzJ3 vuueO255bTnXO+aNJ8svk6SAbis= X-Google-Smtp-Source: APXvYqwQaluT7cGzS3XYBm4Y8RoceEJ1VTQBvvAwDXf4MAhiqevIDsAsYW7T0nn8yGDwiH/E9Rq2qg== X-Received: by 2002:a5d:4612:: with SMTP id t18mr15452491wrq.98.1581529231007; Wed, 12 Feb 2020 09:40:31 -0800 (PST) Received: from avx2 ([46.53.253.3]) by smtp.gmail.com with ESMTPSA id l131sm1538722wmf.31.2020.02.12.09.40.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Feb 2020 09:40:30 -0800 (PST) Date: Wed, 12 Feb 2020 20:40:27 +0300 From: Alexey Dobriyan To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, hare@suse.de Subject: [PATCH] block, zoned: fix integer overflow with BLKRESETZONE et al Message-ID: <20200212174027.GA3535@avx2> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Check for overflow in addition before checking for end-of-block-device. Steps to reproduce: #define _GNU_SOURCE 1 #include #include #include #include typedef unsigned long long __u64; struct blk_zone_range { __u64 sector; __u64 nr_sectors; }; #define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range) int main(void) { int fd = open("/dev/nullb0", O_RDWR|O_DIRECT); struct blk_zone_range zr = {4096, 0xfffffffffffff000ULL}; ioctl(fd, BLKRESETZONE, &zr); return 0; } BUG: KASAN: null-ptr-deref in submit_bio_wait+0x74/0xe0 Write of size 8 at addr 0000000000000040 by task a.out/1590 CPU: 8 PID: 1590 Comm: a.out Not tainted 5.6.0-rc1-00019-g359c92c02bfa #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ?-20190711_202441-buildvm-armv7-10.arm.fedoraproject.org-2.fc31 04/01/2014 Call Trace: dump_stack+0x76/0xa0 __kasan_report.cold+0x5/0x3e kasan_report+0xe/0x20 submit_bio_wait+0x74/0xe0 blkdev_zone_mgmt+0x26f/0x2a0 blkdev_zone_mgmt_ioctl+0x14b/0x1b0 blkdev_ioctl+0xb28/0xe60 block_ioctl+0x69/0x80 ksys_ioctl+0x3af/0xa50 Signed-off-by: Alexey Dobriyan (SK hynix) --- block/blk-zoned.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -173,7 +173,7 @@ int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, if (!op_is_zone_mgmt(op)) return -EOPNOTSUPP; - if (!nr_sectors || end_sector > capacity) + if (end_sector <= sector || end_sector > capacity) /* Out of range */ return -EINVAL;