From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Date: Mon, 09 Dec 2019 05:25:09 +0000 Subject: Re: KASAN: slab-out-of-bounds Read in bit_putcs Message-Id: <00000000000075564805993e9eeb@google.com> List-Id: In-Reply-To: <0000000000007f075c0598f7aa38@google.com> References: <0000000000007f075c0598f7aa38@google.com> In-Reply-To: <0000000000007f075c0598f7aa38@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" 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: 9455d25f Merge tag 'ntb-5.5' of git://github.com/jonmason/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16b1d1bce00000 kernel config: https://syzkaller.appspot.com/x/.config?xz3b8f5088d4043a dashboard link: https://syzkaller.appspot.com/bug?extid=998dec6452146bd7a90c compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12fa5c2ee00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e327f2e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+998dec6452146bd7a90c@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: slab-out-of-bounds in __fb_pad_aligned_buffer =20 include/linux/fb.h:655 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs_aligned =20 drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs+0xd5d/0xf10 =20 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff8880a66ec808 by task syz-executor523/8819 CPU: 1 PID: 8819 Comm: syz-executor523 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+0xd4/0x30b mm/kasan/report.c:3= 74 __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: 0033:0x446a79 Code: e8 ec e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 3b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f451fcd2d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446a79 RDX: 0000000020000180 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc5c R13: 0000000000000000 R14: 00000000f72a8fce R15: 0000000000000000 Allocated by task 8802: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] fbcon_set_font+0x32d/0x860 drivers/video/fbdev/core/fbcon.c:2663 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 Freed by task 8528: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 kvfree+0x61/0x70 mm/util.c:603 __free_fdtable+0x34/0x80 fs/file.c:31 put_files_struct fs/file.c:420 [inline] put_files_struct+0x253/0x2f0 fs/file.c:413 exit_files+0x83/0xb0 fs/file.c:445 do_exit+0x8b5/0x2ef0 kernel/exit.c:792 do_group_exit+0x135/0x360 kernel/exit.c:895 __do_sys_exit_group kernel/exit.c:906 [inline] __se_sys_exit_group kernel/exit.c:904 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:904 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a66ec000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 8 bytes to the right of 2048-byte region [ffff8880a66ec000, ffff8880a66ec800) The buggy address belongs to the page: page:ffffea000299bb00 refcount:1 mapcount:0 mapping:ffff8880aa400e00 =20 index:0x0 raw: 00fffe0000000200 ffffea000299bac8 ffffea000299bb48 ffff8880aa400e00 raw: 0000000000000000 ffff8880a66ec000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a66ec700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a66ec780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8880a66ec800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a66ec880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a66ec900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc =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 04F26C2D0C0 for ; Mon, 9 Dec 2019 09:46:58 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DA7C520726 for ; Mon, 9 Dec 2019 09:46:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA7C520726 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A5F4A6E34C; Mon, 9 Dec 2019 09:46:38 +0000 (UTC) Received: from mail-il1-f198.google.com (mail-il1-f198.google.com [209.85.166.198]) by gabe.freedesktop.org (Postfix) with ESMTPS id B0DBA6E321 for ; Mon, 9 Dec 2019 05:25:09 +0000 (UTC) Received: by mail-il1-f198.google.com with SMTP id k9so10766614ili.8 for ; Sun, 08 Dec 2019 21:25:09 -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:in-reply-to:message-id:subject :from:to; bh=FUR5HH5qJErdY2JqpOki/U8tKZp98W2ZoPj1kOrVy7U=; b=e+RKQfCkYLWdre4n1Kt3x1MNOK6BBp6zMAvRyScFnIJPMjGzNdU1t0C5T7Y7PLrsX6 LPFes2qi3+3c0b4H7AcoFbWZ34SydqoAt488Q14PYoOmfbDnw1bmWnfo/Fr8w3N/sROG WmQY4v4DQZOsqWiEDAIsby0GNiYmnDYFFxDyPgsT1yU+TpfsOGnPwC0m+cIZS4P38ZHL 2JR0gBpsSff3AFlaomFQf5PklpNXqX3j2oKodN6KsJOvakTt1FoxZw71wys6xMnd8sej t9/TGyTpvpeqBdgUKAc6x+NrRjntvPX9qBwsVuBJCs8kJwxCST12En1+fnxW3C/oIZDe 42BA== X-Gm-Message-State: APjAAAVomV+ISiCFukIVz2+vb1GrysZN13lKl1YbeTeR/cURz9S+GImK rhhbZ/UeIsW6MKDSZbEFObv5EM8Vt9/6VXd20gH9FzfaK870 X-Google-Smtp-Source: APXvYqxbTYgS+UzTWkNlPOh3ufIFqWK1gmZ+gqCKv92ZZKxxyuhbiWeFyYbbA6FIl1xI6HkVG/4jh0arIvL8KxaHAcPOSWwG4FVq MIME-Version: 1.0 X-Received: by 2002:a92:9f9c:: with SMTP id z28mr26764436ilk.239.1575869109062; Sun, 08 Dec 2019 21:25:09 -0800 (PST) Date: Sun, 08 Dec 2019 21:25:09 -0800 In-Reply-To: <0000000000007f075c0598f7aa38@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000075564805993e9eeb@google.com> Subject: Re: KASAN: slab-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" c3l6Ym90IGhhcyBmb3VuZCBhIHJlcHJvZHVjZXIgZm9yIHRoZSBmb2xsb3dpbmcgY3Jhc2ggb246 CgpIRUFEIGNvbW1pdDogICAgOTQ1NWQyNWYgTWVyZ2UgdGFnICdudGItNS41JyBvZiBnaXQ6Ly9n aXRodWIuY29tL2pvbm1hc29uLy4uCmdpdCB0cmVlOiAgICAgICB1cHN0cmVhbQpjb25zb2xlIG91 dHB1dDogaHR0cHM6Ly9zeXprYWxsZXIuYXBwc3BvdC5jb20veC9sb2cudHh0P3g9MTZiMWQxYmNl MDAwMDAKa2VybmVsIGNvbmZpZzogIGh0dHBzOi8vc3l6a2FsbGVyLmFwcHNwb3QuY29tL3gvLmNv bmZpZz94PTdhM2I4ZjUwODhkNDA0M2EKZGFzaGJvYXJkIGxpbms6IGh0dHBzOi8vc3l6a2FsbGVy LmFwcHNwb3QuY29tL2J1Zz9leHRpZD05OThkZWM2NDUyMTQ2YmQ3YTkwYwpjb21waWxlcjogICAg ICAgZ2NjIChHQ0MpIDkuMC4wIDIwMTgxMjMxIChleHBlcmltZW50YWwpCnN5eiByZXBybzogICAg 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LmZyZWVkZXNrdG9wLm9yZwpodHRwczovL2xpc3RzLmZyZWVkZXNrdG9wLm9yZy9tYWlsbWFuL2xp c3RpbmZvL2RyaS1kZXZlbA== 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 2E106C43603 for ; Mon, 9 Dec 2019 05:25:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE42520637 for ; Mon, 9 Dec 2019 05:25:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726408AbfLIFZK (ORCPT ); Mon, 9 Dec 2019 00:25:10 -0500 Received: from mail-il1-f198.google.com ([209.85.166.198]:37726 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725819AbfLIFZJ (ORCPT ); Mon, 9 Dec 2019 00:25:09 -0500 Received: by mail-il1-f198.google.com with SMTP id t19so10852662ila.4 for ; Sun, 08 Dec 2019 21:25:09 -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:in-reply-to:message-id:subject :from:to; bh=FUR5HH5qJErdY2JqpOki/U8tKZp98W2ZoPj1kOrVy7U=; b=rCSGPDxrMlo3V/1dV0iLCyMnpLkNIVkmvrw121Qz4yZ+JUVTA6QhOnvGc+QCPM7xwM c2a5xxw42kuLHIGrEPWde/7M9z/ejr01XP7S6JO6SbOOW99r3bsuI99H2r3KIvUFWNTr eMii9AGNWxqMC6VRt8aF0DCW4ItUFntXg5fZXZzSTtVlopasuH6n2mKEnBZLb/ZKKXK0 G+FXMsRnjAtCfFIUW8rXQOZsqA61PCOMrU+zeDqgqTvXQxPE2XTTtciW6BV0ZtWPUMD1 kuFq+ahxw9A2zCCaylfde2LTPxSHBQbTb8k3sChO8X1V+nur5qDbdsBKJ3c4f9EY60cU v4Pw== X-Gm-Message-State: APjAAAUl9YUqcdwrgIu+nrzAobyR0djKUWb6WC/pqy69BQGUaGIrpzFW 3TMGrrlwXZ039/UrOtwPxAu8euYXA18ZSQ4lSSP0bVEy0VeY X-Google-Smtp-Source: APXvYqxbTYgS+UzTWkNlPOh3ufIFqWK1gmZ+gqCKv92ZZKxxyuhbiWeFyYbbA6FIl1xI6HkVG/4jh0arIvL8KxaHAcPOSWwG4FVq MIME-Version: 1.0 X-Received: by 2002:a92:9f9c:: with SMTP id z28mr26764436ilk.239.1575869109062; Sun, 08 Dec 2019 21:25:09 -0800 (PST) Date: Sun, 08 Dec 2019 21:25:09 -0800 In-Reply-To: <0000000000007f075c0598f7aa38@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000075564805993e9eeb@google.com> Subject: Re: KASAN: slab-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 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: 9455d25f Merge tag 'ntb-5.5' of git://github.com/jonmason/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16b1d1bce00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7a3b8f5088d4043a dashboard link: https://syzkaller.appspot.com/bug?extid=998dec6452146bd7a90c compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12fa5c2ee00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e327f2e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+998dec6452146bd7a90c@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in __fb_pad_aligned_buffer include/linux/fb.h:655 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs_aligned drivers/video/fbdev/core/bitblit.c:96 [inline] BUG: KASAN: slab-out-of-bounds in bit_putcs+0xd5d/0xf10 drivers/video/fbdev/core/bitblit.c:185 Read of size 1 at addr ffff8880a66ec808 by task syz-executor523/8819 CPU: 1 PID: 8819 Comm: syz-executor523 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+0xd4/0x30b 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: 0033:0x446a79 Code: e8 ec e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 3b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f451fcd2d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000006dbc58 RCX: 0000000000446a79 RDX: 0000000020000180 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc5c R13: 0000000000000000 R14: 00000000f72a8fce R15: 0000000000000000 Allocated by task 8802: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] fbcon_set_font+0x32d/0x860 drivers/video/fbdev/core/fbcon.c:2663 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 Freed by task 8528: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 kvfree+0x61/0x70 mm/util.c:603 __free_fdtable+0x34/0x80 fs/file.c:31 put_files_struct fs/file.c:420 [inline] put_files_struct+0x253/0x2f0 fs/file.c:413 exit_files+0x83/0xb0 fs/file.c:445 do_exit+0x8b5/0x2ef0 kernel/exit.c:792 do_group_exit+0x135/0x360 kernel/exit.c:895 __do_sys_exit_group kernel/exit.c:906 [inline] __se_sys_exit_group kernel/exit.c:904 [inline] __x64_sys_exit_group+0x44/0x50 kernel/exit.c:904 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a66ec000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 8 bytes to the right of 2048-byte region [ffff8880a66ec000, ffff8880a66ec800) The buggy address belongs to the page: page:ffffea000299bb00 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 raw: 00fffe0000000200 ffffea000299bac8 ffffea000299bb48 ffff8880aa400e00 raw: 0000000000000000 ffff8880a66ec000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a66ec700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a66ec780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8880a66ec800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a66ec880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a66ec900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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