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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 94CBEC43603 for ; Thu, 12 Dec 2019 08:58:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 712DA22B48 for ; Thu, 12 Dec 2019 08:58:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728308AbfLLI6J (ORCPT ); Thu, 12 Dec 2019 03:58:09 -0500 Received: from mail-il1-f198.google.com ([209.85.166.198]:47911 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728294AbfLLI6I (ORCPT ); Thu, 12 Dec 2019 03:58:08 -0500 Received: by mail-il1-f198.google.com with SMTP id x69so1098254ill.14 for ; Thu, 12 Dec 2019 00:58:08 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=sKHgHXNET5NzD721BUspeErwLiJQg0Q5DJ+q3NfquJk=; b=aYhVFxwjnCF8JTN4QWMJfrRhi5HsUQlsQp+LUsD6V6k5jZMfhCRLlk4C5XLnY6zF3l I4sYui7Xh/1c5sxQTcNVoM+O6lVRI8ok/loBWEvmdCImbJ05fs59aaoXGmuhxGKzBIyK ZVPWUU7pop1l3EHzIp4UTHK8qrva9Nzy1Wlcv1IhtFhBnnSNwQz8mooa1AwBvsu7WrwG yN5lipEg7piwxubya7pbRilhY+ShB6LpGKhlGD1IqldeGc6Pv80J/kGNjSM1Qn4zGH4Y jIxXA3EhS5w/nG7bCCS/rECwftSjCqAbPdg/G8GYIVfR13rxeM41oqp5Fi39KLoxDm0c Utjw== X-Gm-Message-State: APjAAAUij0udoJ41ixvdc0F/7Nupu41N9AhhDfa0A3FNFKJtI/LX0MuE x0JsLrDv74xDqwdJQbmfiXZVSiH9wv2Zfik/YwY9cUxznI6E X-Google-Smtp-Source: APXvYqx4u070HFRMDkGpEFRM3FrKCEMy5hsKbvsI8QdZuftRgcmVPMDZHUFnn42Ky/ql3KF7nfQd4HJp2UER/h7+3yU1ijlGeOlB MIME-Version: 1.0 X-Received: by 2002:a5d:9046:: with SMTP id v6mr2073717ioq.302.1576141087806; Thu, 12 Dec 2019 00:58:07 -0800 (PST) Date: Thu, 12 Dec 2019 00:58:07 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a79daf05997df166@google.com> Subject: KASAN: global-out-of-bounds Read in soft_cursor From: syzbot To: b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 687dec9b Merge tag 'erofs-for-5.5-rc2-fixes' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14e0acfae00000 kernel config: https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d dashboard link: https://syzkaller.appspot.com/bug?extid=88dbe7c16ff8616b3720 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+88dbe7c16ff8616b3720@syzkaller.appspotmail.com ================================================================== BUG: KASAN: global-out-of-bounds in memcpy include/linux/string.h:380 [inline] BUG: KASAN: global-out-of-bounds in soft_cursor+0x439/0xa30 drivers/video/fbdev/core/softcursor.c:70 Read of size 32 at addr ffffffff8872a360 by task syz-executor.2/24342 CPU: 0 PID: 24342 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memcpy+0x24/0x50 mm/kasan/common.c:125 memcpy include/linux/string.h:380 [inline] soft_cursor+0x439/0xa30 drivers/video/fbdev/core/softcursor.c:70 bit_cursor+0x12fc/0x1a60 drivers/video/fbdev/core/bitblit.c:386 fbcon_cursor+0x487/0x660 drivers/video/fbdev/core/fbcon.c:1402 hide_cursor+0x9d/0x2b0 drivers/tty/vt/vt.c:895 redraw_screen+0x60b/0x7d0 drivers/tty/vt/vt.c:988 fbcon_do_set_font+0x829/0x960 drivers/video/fbdev/core/fbcon.c:2605 fbcon_copy_font+0x12c/0x190 drivers/video/fbdev/core/fbcon.c:2620 con_font_copy drivers/tty/vt/vt.c:4594 [inline] con_font_op+0x6b2/0x1270 drivers/tty/vt/vt.c:4609 vt_ioctl+0x181a/0x26d0 drivers/tty/vt/vt_ioctl.c:965 tty_ioctl+0xa37/0x14f0 drivers/tty/tty_io.c:2660 vfs_ioctl fs/ioctl.c:47 [inline] file_ioctl fs/ioctl.c:545 [inline] do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749 __do_sys_ioctl fs/ioctl.c:756 [inline] __se_sys_ioctl fs/ioctl.c:754 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a909 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f61bb330c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a909 RDX: 0000000020000040 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f61bb3316d4 R13: 00000000004c3a41 R14: 00000000004d8f78 R15: 00000000ffffffff The buggy address belongs to the variable: oid_index+0x520/0xb80 Memory state around the buggy address: ffffffff8872a200: 00 07 fa fa fa fa fa fa 00 06 fa fa fa fa fa fa ffffffff8872a280: 06 fa fa fa fa fa fa fa 00 00 00 04 fa fa fa fa > ffffffff8872a300: 00 00 fa fa fa fa fa fa 00 00 06 fa fa fa fa fa ^ ffffffff8872a380: 00 06 fa fa fa fa fa fa 00 00 00 00 fa fa fa fa ffffffff8872a400: 00 00 01 fa fa fa fa fa 06 fa fa fa fa fa fa fa ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.