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 E116DC43603 for ; Tue, 10 Dec 2019 16:38:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B26EE2073D for ; Tue, 10 Dec 2019 16:38:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727494AbfLJQiK (ORCPT ); Tue, 10 Dec 2019 11:38:10 -0500 Received: from mail-io1-f69.google.com ([209.85.166.69]:39680 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727505AbfLJQiJ (ORCPT ); Tue, 10 Dec 2019 11:38:09 -0500 Received: by mail-io1-f69.google.com with SMTP id u13so13665583iol.6 for ; Tue, 10 Dec 2019 08:38:09 -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=Wy2IZtOVQJXJFzmWDs7KozDvLtPFlT6/AubPV8rI/io=; b=AKs9acJcrV5o5etMqejzOu9sSa7es4kCRJkA5e212V/dtCLWPEkuZ7tW8ppPa1ctA4 9MzFxEbFh+frYBRQ3Mv+BPuT+3LYv9WmNjiEPnNm0OVdmArtJipfvd1jQkkhYy80DJ1W UUNN3WR39ipOoDyd0JChYi/0L5aKnXbRrd+jL7qWwBV69zT7+1SJK5I1X8QLQycp1Xzg 1gfX6m1mnE5eijw3UKW5WFeFdc6unIVzQkfFyOgO099HEoiDK5iITbRXLHL/VU6teSuS LQwi8e+p7QD5ef6oh4m/uiRZq6MsOKOEiOEQxgM/84hmlSRrir/8u+3KifPDjyvbEBhS d6IQ== X-Gm-Message-State: APjAAAWLGILaiHvB3Sq0bugWPpN6Ewtpj9iM7ENaXSZC0W5QO1ac+COE iQr0WkBypZUXJgMeD6fSb/U/Jg5Ltjs00jDnT8wsaBzOOgmb X-Google-Smtp-Source: APXvYqyDo9K8vevL0YNGNhrWfeezwrGE8z8f9j+LmC9hq8lwhAOa6lpuVlvPwXzPGNLPnGc+pOd8oQNxBUFVUlwehZpr6TOocqjU MIME-Version: 1.0 X-Received: by 2002:a5d:9eda:: with SMTP id a26mr26850018ioe.238.1575995888911; Tue, 10 Dec 2019 08:38:08 -0800 (PST) Date: Tue, 10 Dec 2019 08:38:08 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000204d2105995c23eb@google.com> Subject: KASAN: vmalloc-out-of-bounds Write in sys_imageblit 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: 6794862a Merge tag 'for-5.5-rc1-kconfig-tag' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17f407f2e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d dashboard link: https://syzkaller.appspot.com/bug?extid=26dc38a00dc05118a4e6 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+26dc38a00dc05118a4e6@syzkaller.appspotmail.com ================================================================== BUG: KASAN: vmalloc-out-of-bounds in fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline] BUG: KASAN: vmalloc-out-of-bounds in sys_imageblit+0x117f/0x1240 drivers/video/fbdev/core/sysimgblt.c:275 Write of size 4 at addr ffffc90008de1000 by task syz-executor.3/19698 CPU: 0 PID: 19698 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 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 __asan_report_store4_noabort+0x17/0x20 mm/kasan/generic_report.c:139 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline] sys_imageblit+0x117f/0x1240 drivers/video/fbdev/core/sysimgblt.c:275 drm_fb_helper_sys_imageblit+0x21/0x180 drivers/gpu/drm/drm_fb_helper.c:768 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x9a3/0xf10 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x33c/0x3e0 drivers/video/fbdev/core/fbcon.c:1353 do_update_region+0x42b/0x6f0 drivers/tty/vt/vt.c:677 invert_screen+0x2da/0x650 drivers/tty/vt/vt.c:794 highlight drivers/tty/vt/selection.c:53 [inline] clear_selection drivers/tty/vt/selection.c:81 [inline] clear_selection+0x59/0x70 drivers/tty/vt/selection.c:77 vc_do_resize+0x1163/0x1460 drivers/tty/vt/vt.c:1200 vc_resize+0x4d/0x60 drivers/tty/vt/vt.c:1304 fbcon_do_set_font+0x4a6/0x960 drivers/video/fbdev/core/fbcon.c:2599 fbcon_set_font+0x72e/0x860 drivers/video/fbdev/core/fbcon.c:2696 con_font_set drivers/tty/vt/vt.c:4538 [inline] con_font_op+0xe30/0x1270 drivers/tty/vt/vt.c:4603 vt_ioctl+0xd2e/0x26d0 drivers/tty/vt/vt_ioctl.c:913 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: 0033:0x45a7c9 Code: bd b1 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcfa0ba6c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000072bf00 RCX: 000000000045a7c9 RDX: 0000000020000140 RSI: 0000000000004b61 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcfa0ba76d4 R13: 00000000004ab60f R14: 00000000006ede60 R15: 00000000ffffffff Memory state around the buggy address: ffffc90008de0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90008de0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffffc90008de1000: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ^ ffffc90008de1080: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ffffc90008de1100: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 ================================================================== --- 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.