From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Date: Fri, 06 Dec 2019 16:34:09 +0000 Subject: Re: KASAN: global-out-of-bounds Read in bit_putcs Message-Id: <0000000000008409aa05990b9d8a@google.com> List-Id: In-Reply-To: <0000000000007b17010598f7aa1f@google.com> References: <0000000000007b17010598f7aa1f@google.com> In-Reply-To: <0000000000007b17010598f7aa1f@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: b.zolnierkie@samsung.com, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com syzbot has found a reproducer for the following crash on: HEAD commit: b0d4beaa Merge branch 'next.autofs' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1015a90ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=F07a23020fd7d21a dashboard link: https://syzkaller.appspot.com/bug?extid8a3699c7eaf165b97a6 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1795d941e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+38a3699c7eaf165b97a6@syzkaller.appspotmail.com =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer =20 include/linux/fb.h:655 [inline] BUG: KASAN: global-out-of-bounds in bit_putcs_aligned =20 drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: global-out-of-bounds in bit_putcs+0xd5d/0xf10 =20 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffffffff88726a41 by task syz-executor.5/9415 CPU: 1 PID: 9415 Comm: syz-executor.5 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS =20 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 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __fb_pad_aligned_buffer include/linux/fb.h:655 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x33c/0x3e0 drivers/video/fbdev/core/fbcon.c:1353 do_update_region+0x42b/0x6f0 drivers/tty/vt/vt.c:677 redraw_screen+0x676/0x7d0 drivers/tty/vt/vt.c:1011 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: 0033:0x45a679 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 = =20 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:00007f5b74dffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679 RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5b74e006d4 R13: 00000000004c37ab R14: 00000000004d8c38 R15: 00000000ffffffff The buggy address belongs to the variable: oid_index+0xb01/0xb80 Memory state around the buggy address: ffffffff88726900: 00 00 02 fa fa fa fa fa 00 00 00 05 fa fa fa fa ffffffff88726980: 00 00 00 fa fa fa fa fa 00 00 00 00 00 01 fa fa > ffffffff88726a00: fa fa fa fa 00 00 00 00 01 fa fa fa fa fa fa fa ^ ffffffff88726a80: 00 00 00 00 fa fa fa fa 00 03 fa fa fa fa fa fa ffffffff88726b00: 04 fa fa fa fa fa fa fa 00 00 01 fa fa fa fa fa =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D 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 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2019 08:34:09 -0800 (PST) Date: Fri, 06 Dec 2019 08:34:09 -0800 In-Reply-To: <0000000000007b17010598f7aa1f@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008409aa05990b9d8a@google.com> Subject: Re: KASAN: global-out-of-bounds Read in bit_putcs 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 X-Mailman-Approved-At: Mon, 09 Dec 2019 09:46:36 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed"; DelSp="yes" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6492D20659 for ; Fri, 6 Dec 2019 16:34:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726826AbfLFQeL (ORCPT ); Fri, 6 Dec 2019 11:34:11 -0500 Received: from mail-il1-f199.google.com ([209.85.166.199]:55827 "EHLO mail-il1-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726258AbfLFQeK (ORCPT ); Fri, 6 Dec 2019 11:34:10 -0500 Received: by mail-il1-f199.google.com with SMTP id d14so5605458ild.22 for ; Fri, 06 Dec 2019 08:34:10 -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:in-reply-to:message-id:subject :from:to; bh=rqCputwRcsxKt2PlVXuw5MtF3XLiOp9UpYUuXc2aLgA=; b=QOCA1/CJkB2vnTBnnFtIRP03Yjyz9BA+VBjGh0A2f+yA36QqAFkYox0nPoDtXsPByK YRbM/9SZx373mSH3tmzTo+jYlTbjo08aI3zqATgtO3q2Bfj0cvuRDK7ijp7Z3LBP5nIG 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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 syzbot has found a reproducer for the following crash on: HEAD commit: b0d4beaa Merge branch 'next.autofs' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1015a90ee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=f07a23020fd7d21a dashboard link: https://syzkaller.appspot.com/bug?extid=38a3699c7eaf165b97a6 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1795d941e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+38a3699c7eaf165b97a6@syzkaller.appspotmail.com ================================================================== BUG: KASAN: global-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:655 [inline] BUG: KASAN: global-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: global-out-of-bounds in bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffffffff88726a41 by task syz-executor.5/9415 CPU: 1 PID: 9415 Comm: syz-executor.5 Not tainted 5.4.0-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 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __fb_pad_aligned_buffer include/linux/fb.h:655 [inline] bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185 fbcon_putcs+0x33c/0x3e0 drivers/video/fbdev/core/fbcon.c:1353 do_update_region+0x42b/0x6f0 drivers/tty/vt/vt.c:677 redraw_screen+0x676/0x7d0 drivers/tty/vt/vt.c:1011 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: 0033:0x45a679 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:00007f5b74dffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a679 RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5b74e006d4 R13: 00000000004c37ab R14: 00000000004d8c38 R15: 00000000ffffffff The buggy address belongs to the variable: oid_index+0xb01/0xb80 Memory state around the buggy address: ffffffff88726900: 00 00 02 fa fa fa fa fa 00 00 00 05 fa fa fa fa ffffffff88726980: 00 00 00 fa fa fa fa fa 00 00 00 00 00 01 fa fa > ffffffff88726a00: fa fa fa fa 00 00 00 00 01 fa fa fa fa fa fa fa ^ ffffffff88726a80: 00 00 00 00 fa fa fa fa 00 03 fa fa fa fa fa fa ffffffff88726b00: 04 fa fa fa fa fa fa fa 00 00 01 fa fa fa fa fa ==================================================================