From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Date: Fri, 27 Dec 2019 07:22:10 +0000 Subject: KASAN: slab-out-of-bounds Write in fbcon_scroll Message-Id: <00000000000015c31e059aaa5acc@google.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: b.zolnierkie@samsung.com, daniel.vetter@ffwll.ch, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, sam@ravnborg.org, syzkaller-bugs@googlegroups.com Hello, syzbot found the following crash on: HEAD commit: 46cf053e Linux 5.5-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1376a2c6e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ED9d672709340e35 dashboard link: https://syzkaller.appspot.com/bug?extid=A81b7bd8a01c0af7f6cb 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+a81b7bd8a01c0af7f6cb@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 memcpy include/linux/string.h:380 [inline] BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 = =20 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_softback_note =20 drivers/video/fbdev/core/fbcon.c:1854 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_scroll+0x261e/0x35b0 =20 drivers/video/fbdev/core/fbcon.c:1892 Write of size 160 at addr ffff8880a3f17f80 by task syz-executor.3/29803 CPU: 1 PID: 29803 Comm: syz-executor.3 Not tainted 5.5.0-rc3-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 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memcpy+0x38/0x50 mm/kasan/common.c:126 memcpy include/linux/string.h:380 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] fbcon_softback_note drivers/video/fbdev/core/fbcon.c:1854 [inline] fbcon_scroll+0x261e/0x35b0 drivers/video/fbdev/core/fbcon.c:1892 con_scroll+0x3fd/0x650 drivers/tty/vt/vt.c:631 csi_M drivers/tty/vt/vt.c:1995 [inline] do_con_trol+0x4ba7/0x61b0 drivers/tty/vt/vt.c:2376 do_con_write.part.0+0xfd9/0x1ef0 drivers/tty/vt/vt.c:2797 do_con_write drivers/tty/vt/vt.c:2565 [inline] con_write+0x46/0xd0 drivers/tty/vt/vt.c:3135 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046 __vfs_write+0x8a/0x110 fs/read_write.c:494 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 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:00007f4314bc3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 00000000000002c1 RSI: 0000000020000880 RDI: 0000000000000008 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4314bc46d4 R13: 00000000004cbd7a R14: 00000000004e5b48 R15: 00000000ffffffff Allocated by task 1: 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_node mm/slab.c:3616 [inline] __kmalloc_node+0x4e/0x70 mm/slab.c:3623 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xbd/0x100 mm/util.c:574 kvmalloc include/linux/mm.h:655 [inline] fbcon_startup+0xa0e/0xe20 drivers/video/fbdev/core/fbcon.c:1024 do_register_con_driver drivers/tty/vt/vt.c:3965 [inline] do_take_over_console+0x13e/0x5a0 drivers/tty/vt/vt.c:4104 do_fbcon_takeover+0x116/0x220 drivers/video/fbdev/core/fbcon.c:581 fbcon_fb_registered+0x275/0x340 drivers/video/fbdev/core/fbcon.c:3252 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:1652 [inline] register_framebuffer+0x5c3/0xa10 drivers/video/fbdev/core/fbmem.c:1821 vga16fb_probe+0x711/0x825 drivers/video/fbdev/vga16fb.c:1373 platform_drv_probe+0x8d/0x140 drivers/base/platform.c:725 really_probe+0x291/0x710 drivers/base/dd.c:548 driver_probe_device+0x110/0x220 drivers/base/dd.c:721 __device_attach_driver+0x1c9/0x230 drivers/base/dd.c:828 bus_for_each_drv+0x172/0x1f0 drivers/base/bus.c:430 __device_attach+0x237/0x390 drivers/base/dd.c:894 device_initial_probe+0x1b/0x20 drivers/base/dd.c:941 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:490 device_add+0x14fe/0x1d00 drivers/base/core.c:2487 platform_device_add+0x34d/0x6c0 drivers/base/platform.c:562 vga16fb_init+0x15f/0x1d6 drivers/video/fbdev/vga16fb.c:1431 do_one_initcall+0x120/0x820 init/main.c:939 do_initcall_level init/main.c:1007 [inline] do_initcalls init/main.c:1015 [inline] do_basic_setup init/main.c:1032 [inline] kernel_init_freeable+0x4ca/0x570 init/main.c:1216 kernel_init+0x12/0x1bf init/main.c:1110 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8880a3f10000 which belongs to the cache kmalloc-32k of size 32768 The buggy address is located 32640 bytes inside of 32768-byte region [ffff8880a3f10000, ffff8880a3f18000) The buggy address belongs to the page: page:ffffea00028fc400 refcount:1 mapcount:0 mapping:ffff8880aa402540 =20 index:0x0 compound_mapcount: 0 raw: 00fffe0000010200 ffff8880aa401d48 ffffea000285e808 ffff8880aa402540 raw: 0000000000000000 ffff8880a3f10000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a3f17f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a3f17f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8880a3f18000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a3f18080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a3f18100: 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 --- 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. 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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 89B3AC2D0CE for ; Fri, 27 Dec 2019 10:39:25 +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 6A28120882 for ; Fri, 27 Dec 2019 10:39:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6A28120882 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 955176E3F2; Fri, 27 Dec 2019 10:39:15 +0000 (UTC) Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9535589D42 for ; Fri, 27 Dec 2019 07:22:10 +0000 (UTC) Received: by mail-il1-f200.google.com with SMTP id h18so8314822ilc.2 for ; Thu, 26 Dec 2019 23:22:10 -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:message-id:subject:from:to; bh=J4WG0zdULFeojun43/wro7heuTg5Y4Hzq/nOnAMzFEw=; b=TkabgXu3fJ2ZVsov3gxqySkUOmyAZs3mqxQP98x9xt4/WVNiCYCRP5UcIuk3L9tb1n gNHKpCIx0ulvnDJk/ux/uj0ST4+SL+IKppvV1JnAf34oWwU5c8K8WE9NfBCHQEjaIpi7 URLr34woSIdpyd85X2XBaBhlDB8MefrhBYSNqE0dz26LrLJqQKkU+xwJB8TtiA6zJvCz JKKqYC9bd8tItdCZnMczQSIZ8a/5X2He3MqjfMdifP3I7/WmFZQkG5dKMRitMk8PUVVN I/VX7lUel4FidX8ZzB6gLTtM4CdxhaFKvahoQ/qdySu8rGl5MBbeAnNRq/4D/BvQ2GWW ND0Q== X-Gm-Message-State: APjAAAW6nSvgPJdx6RDbmxobMAnbsO67vE40iBr4c3Q24tX0VxbpQ/AZ CDwE+pcI0M3IlhsHhPcSH/SBlu1pK9TCLBO0Oaen/CLeYTfQ X-Google-Smtp-Source: APXvYqxagLUL6+R9K7Gi3clNmdOyvDAAkRP0DAqU4joykEeyAWyRcfaItm/TvkqcVD/Ze8IpwuKmoEv5Ii8n7fQsJAnV+JxMkZAV MIME-Version: 1.0 X-Received: by 2002:a92:d151:: with SMTP id t17mr26790678ilg.175.1577431330035; Thu, 26 Dec 2019 23:22:10 -0800 (PST) Date: Thu, 26 Dec 2019 23:22:10 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000015c31e059aaa5acc@google.com> Subject: KASAN: slab-out-of-bounds Write in fbcon_scroll From: syzbot To: b.zolnierkie@samsung.com, daniel.vetter@ffwll.ch, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, sam@ravnborg.org, syzkaller-bugs@googlegroups.com X-Mailman-Approved-At: Fri, 27 Dec 2019 10:39:14 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed"; DelSp="yes" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hello, syzbot found the following crash on: HEAD commit: 46cf053e Linux 5.5-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1376a2c6e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ed9d672709340e35 dashboard link: https://syzkaller.appspot.com/bug?extid=a81b7bd8a01c0af7f6cb 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+a81b7bd8a01c0af7f6cb@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline] BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_softback_note drivers/video/fbdev/core/fbcon.c:1854 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_scroll+0x261e/0x35b0 drivers/video/fbdev/core/fbcon.c:1892 Write of size 160 at addr ffff8880a3f17f80 by task syz-executor.3/29803 CPU: 1 PID: 29803 Comm: syz-executor.3 Not tainted 5.5.0-rc3-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 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memcpy+0x38/0x50 mm/kasan/common.c:126 memcpy include/linux/string.h:380 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] fbcon_softback_note drivers/video/fbdev/core/fbcon.c:1854 [inline] fbcon_scroll+0x261e/0x35b0 drivers/video/fbdev/core/fbcon.c:1892 con_scroll+0x3fd/0x650 drivers/tty/vt/vt.c:631 csi_M drivers/tty/vt/vt.c:1995 [inline] do_con_trol+0x4ba7/0x61b0 drivers/tty/vt/vt.c:2376 do_con_write.part.0+0xfd9/0x1ef0 drivers/tty/vt/vt.c:2797 do_con_write drivers/tty/vt/vt.c:2565 [inline] con_write+0x46/0xd0 drivers/tty/vt/vt.c:3135 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046 __vfs_write+0x8a/0x110 fs/read_write.c:494 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 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:00007f4314bc3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 00000000000002c1 RSI: 0000000020000880 RDI: 0000000000000008 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4314bc46d4 R13: 00000000004cbd7a R14: 00000000004e5b48 R15: 00000000ffffffff Allocated by task 1: 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_node mm/slab.c:3616 [inline] __kmalloc_node+0x4e/0x70 mm/slab.c:3623 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xbd/0x100 mm/util.c:574 kvmalloc include/linux/mm.h:655 [inline] fbcon_startup+0xa0e/0xe20 drivers/video/fbdev/core/fbcon.c:1024 do_register_con_driver drivers/tty/vt/vt.c:3965 [inline] do_take_over_console+0x13e/0x5a0 drivers/tty/vt/vt.c:4104 do_fbcon_takeover+0x116/0x220 drivers/video/fbdev/core/fbcon.c:581 fbcon_fb_registered+0x275/0x340 drivers/video/fbdev/core/fbcon.c:3252 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:1652 [inline] register_framebuffer+0x5c3/0xa10 drivers/video/fbdev/core/fbmem.c:1821 vga16fb_probe+0x711/0x825 drivers/video/fbdev/vga16fb.c:1373 platform_drv_probe+0x8d/0x140 drivers/base/platform.c:725 really_probe+0x291/0x710 drivers/base/dd.c:548 driver_probe_device+0x110/0x220 drivers/base/dd.c:721 __device_attach_driver+0x1c9/0x230 drivers/base/dd.c:828 bus_for_each_drv+0x172/0x1f0 drivers/base/bus.c:430 __device_attach+0x237/0x390 drivers/base/dd.c:894 device_initial_probe+0x1b/0x20 drivers/base/dd.c:941 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:490 device_add+0x14fe/0x1d00 drivers/base/core.c:2487 platform_device_add+0x34d/0x6c0 drivers/base/platform.c:562 vga16fb_init+0x15f/0x1d6 drivers/video/fbdev/vga16fb.c:1431 do_one_initcall+0x120/0x820 init/main.c:939 do_initcall_level init/main.c:1007 [inline] do_initcalls init/main.c:1015 [inline] do_basic_setup init/main.c:1032 [inline] kernel_init_freeable+0x4ca/0x570 init/main.c:1216 kernel_init+0x12/0x1bf init/main.c:1110 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8880a3f10000 which belongs to the cache kmalloc-32k of size 32768 The buggy address is located 32640 bytes inside of 32768-byte region [ffff8880a3f10000, ffff8880a3f18000) The buggy address belongs to the page: page:ffffea00028fc400 refcount:1 mapcount:0 mapping:ffff8880aa402540 index:0x0 compound_mapcount: 0 raw: 00fffe0000010200 ffff8880aa401d48 ffffea000285e808 ffff8880aa402540 raw: 0000000000000000 ffff8880a3f10000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a3f17f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a3f17f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8880a3f18000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a3f18080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a3f18100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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. _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel 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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 A6F06C2D0C6 for ; Fri, 27 Dec 2019 07:22:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7829F20882 for ; Fri, 27 Dec 2019 07:22:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727180AbfL0HWM (ORCPT ); Fri, 27 Dec 2019 02:22:12 -0500 Received: from mail-io1-f71.google.com ([209.85.166.71]:47968 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726354AbfL0HWM (ORCPT ); Fri, 27 Dec 2019 02:22:12 -0500 Received: by mail-io1-f71.google.com with SMTP id 13so18368613iof.14 for ; Thu, 26 Dec 2019 23:22:10 -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:message-id:subject:from:to; bh=J4WG0zdULFeojun43/wro7heuTg5Y4Hzq/nOnAMzFEw=; b=gjAxh9TPOC3jjkl38Y8H8V4UBAD5BuIdHUBGnyMYlyK5MOnMS/eMhP3Bx6/3/uzoke PJ5rtA/4xxaJ4KAMSPEOi/CNSb1m7s9Wy6eo4LX6GdnNefSKSX6iqKv1g3ntggn99QYl 6rkSg54T0olLeh5C8uPiNRxSqC9bmkUTgr78fr2iQiJOm24dVtov3BGFEgRxDb2E8rQL +USa4TgviN8uiJpB2kV95ISZhcaMbzJKAodOsbMQgk4xYEAO2J1s0K1OGHPk6fDzUM2E mnaLa24TFO5JTHyhHOclfGT0hg+6w7yRa1xObPyS9C9d/odBbjoRAY72SRrXo4r9kuy5 3pug== X-Gm-Message-State: APjAAAUmyG21eqotiM/Rar9hs0q+uFzGyk2e18MPy+Z6omHtiWc9Mwme QW+mgcJl+j7NSCCSN9Zy0TQcqgfTFVc2fHzzaVPuKA8dPWFx X-Google-Smtp-Source: APXvYqxagLUL6+R9K7Gi3clNmdOyvDAAkRP0DAqU4joykEeyAWyRcfaItm/TvkqcVD/Ze8IpwuKmoEv5Ii8n7fQsJAnV+JxMkZAV MIME-Version: 1.0 X-Received: by 2002:a92:d151:: with SMTP id t17mr26790678ilg.175.1577431330035; Thu, 26 Dec 2019 23:22:10 -0800 (PST) Date: Thu, 26 Dec 2019 23:22:10 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000015c31e059aaa5acc@google.com> Subject: KASAN: slab-out-of-bounds Write in fbcon_scroll From: syzbot To: b.zolnierkie@samsung.com, daniel.vetter@ffwll.ch, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, sam@ravnborg.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: 46cf053e Linux 5.5-rc3 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1376a2c6e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=ed9d672709340e35 dashboard link: https://syzkaller.appspot.com/bug?extid=a81b7bd8a01c0af7f6cb 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+a81b7bd8a01c0af7f6cb@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:380 [inline] BUG: KASAN: slab-out-of-bounds in scr_memcpyw include/linux/vt_buffer.h:49 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_softback_note drivers/video/fbdev/core/fbcon.c:1854 [inline] BUG: KASAN: slab-out-of-bounds in fbcon_scroll+0x261e/0x35b0 drivers/video/fbdev/core/fbcon.c:1892 Write of size 160 at addr ffff8880a3f17f80 by task syz-executor.3/29803 CPU: 1 PID: 29803 Comm: syz-executor.3 Not tainted 5.5.0-rc3-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 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 memcpy+0x38/0x50 mm/kasan/common.c:126 memcpy include/linux/string.h:380 [inline] scr_memcpyw include/linux/vt_buffer.h:49 [inline] fbcon_softback_note drivers/video/fbdev/core/fbcon.c:1854 [inline] fbcon_scroll+0x261e/0x35b0 drivers/video/fbdev/core/fbcon.c:1892 con_scroll+0x3fd/0x650 drivers/tty/vt/vt.c:631 csi_M drivers/tty/vt/vt.c:1995 [inline] do_con_trol+0x4ba7/0x61b0 drivers/tty/vt/vt.c:2376 do_con_write.part.0+0xfd9/0x1ef0 drivers/tty/vt/vt.c:2797 do_con_write drivers/tty/vt/vt.c:2565 [inline] con_write+0x46/0xd0 drivers/tty/vt/vt.c:3135 process_output_block drivers/tty/n_tty.c:595 [inline] n_tty_write+0x40e/0x1080 drivers/tty/n_tty.c:2333 do_tty_write drivers/tty/tty_io.c:962 [inline] tty_write+0x496/0x7f0 drivers/tty/tty_io.c:1046 __vfs_write+0x8a/0x110 fs/read_write.c:494 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a919 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:00007f4314bc3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919 RDX: 00000000000002c1 RSI: 0000000020000880 RDI: 0000000000000008 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4314bc46d4 R13: 00000000004cbd7a R14: 00000000004e5b48 R15: 00000000ffffffff Allocated by task 1: 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_node mm/slab.c:3616 [inline] __kmalloc_node+0x4e/0x70 mm/slab.c:3623 kmalloc_node include/linux/slab.h:579 [inline] kvmalloc_node+0xbd/0x100 mm/util.c:574 kvmalloc include/linux/mm.h:655 [inline] fbcon_startup+0xa0e/0xe20 drivers/video/fbdev/core/fbcon.c:1024 do_register_con_driver drivers/tty/vt/vt.c:3965 [inline] do_take_over_console+0x13e/0x5a0 drivers/tty/vt/vt.c:4104 do_fbcon_takeover+0x116/0x220 drivers/video/fbdev/core/fbcon.c:581 fbcon_fb_registered+0x275/0x340 drivers/video/fbdev/core/fbcon.c:3252 do_register_framebuffer drivers/video/fbdev/core/fbmem.c:1652 [inline] register_framebuffer+0x5c3/0xa10 drivers/video/fbdev/core/fbmem.c:1821 vga16fb_probe+0x711/0x825 drivers/video/fbdev/vga16fb.c:1373 platform_drv_probe+0x8d/0x140 drivers/base/platform.c:725 really_probe+0x291/0x710 drivers/base/dd.c:548 driver_probe_device+0x110/0x220 drivers/base/dd.c:721 __device_attach_driver+0x1c9/0x230 drivers/base/dd.c:828 bus_for_each_drv+0x172/0x1f0 drivers/base/bus.c:430 __device_attach+0x237/0x390 drivers/base/dd.c:894 device_initial_probe+0x1b/0x20 drivers/base/dd.c:941 bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:490 device_add+0x14fe/0x1d00 drivers/base/core.c:2487 platform_device_add+0x34d/0x6c0 drivers/base/platform.c:562 vga16fb_init+0x15f/0x1d6 drivers/video/fbdev/vga16fb.c:1431 do_one_initcall+0x120/0x820 init/main.c:939 do_initcall_level init/main.c:1007 [inline] do_initcalls init/main.c:1015 [inline] do_basic_setup init/main.c:1032 [inline] kernel_init_freeable+0x4ca/0x570 init/main.c:1216 kernel_init+0x12/0x1bf init/main.c:1110 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff8880a3f10000 which belongs to the cache kmalloc-32k of size 32768 The buggy address is located 32640 bytes inside of 32768-byte region [ffff8880a3f10000, ffff8880a3f18000) The buggy address belongs to the page: page:ffffea00028fc400 refcount:1 mapcount:0 mapping:ffff8880aa402540 index:0x0 compound_mapcount: 0 raw: 00fffe0000010200 ffff8880aa401d48 ffffea000285e808 ffff8880aa402540 raw: 0000000000000000 ffff8880a3f10000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a3f17f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a3f17f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8880a3f18000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a3f18080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a3f18100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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.