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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 042A1C4363C for ; Wed, 7 Oct 2020 07:42:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95D8D2083B for ; Wed, 7 Oct 2020 07:42:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727710AbgJGHmS (ORCPT ); Wed, 7 Oct 2020 03:42:18 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:48796 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726041AbgJGHmS (ORCPT ); Wed, 7 Oct 2020 03:42:18 -0400 Received: by mail-io1-f70.google.com with SMTP id u3so782237iow.15 for ; Wed, 07 Oct 2020 00:42:15 -0700 (PDT) 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=p1jF3bjaKGb+nCiTCUQ8vKDZ+1JpRqSGS18c2r055XA=; b=QGYLJEwLng+V8s8AAPVsZBx2Pvuv0oyAGxbncW8eCz6NZA7CZRrTHlh7UbbVR5gXyH Gk08teRVm61/CCP8JiQEifb8bcPjgvYlXpVY8D122b9ELumG+M9e7oHzTJps+IAEhdNx LxgCa4dcsNh9rP6Y0M1Fbc9JNL/xFRsHGyq0Ck2m1G+1Gc9TS1l4xS5LqTCfwBm8q78k 7hLM8Ec4LdFRClZFpVwKJ1jkcsrPvAL0W3I0/IJMmXA7iPDh1E4klnASd2diZcESAWaO luii6n4Bw1Pnr60jx05ovhCIBxcxDj33HHKhwcyjx3H7CV93/pZZp6GdAZPdEaCgNya8 EjDA== X-Gm-Message-State: AOAM531QhWoxwXmGbNpijuuNYwEpIJYq2AJ4L7O7B9wzrFPXMC2BviKq TKrsP4s+nXEPgZ2gus8t5LXacN6IBR7a9FKx4Cb2gl4WCRD8 X-Google-Smtp-Source: ABdhPJwXOtmVEWOcIEcBe/kpgu7JgPbMmLLFMbvc1tL2TVk6xAr/vicaB3JL2N7OisRGm680vCVzyYzE2nJYTJNWDCmCDddHG9Nm MIME-Version: 1.0 X-Received: by 2002:a92:858c:: with SMTP id f134mr1583646ilh.307.1602056535437; Wed, 07 Oct 2020 00:42:15 -0700 (PDT) Date: Wed, 07 Oct 2020 00:42:15 -0700 In-Reply-To: <000000000000204d2105995c23eb@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b4792b05b10fda4b@google.com> Subject: Re: 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" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: c85fb28b Merge tag 'arm64-fixes' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17406d70500000 kernel config: https://syzkaller.appspot.com/x/.config?x=140446ac2aa637e5 dashboard link: https://syzkaller.appspot.com/bug?extid=26dc38a00dc05118a4e6 compiler: gcc (GCC) 10.1.0-syz 20200507 userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14788d70500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15158ee0500000 IMPORTANT: if you fix the issue, 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/0x1290 drivers/video/fbdev/core/sysimgblt.c:275 Write of size 4 at addr ffffc90009911000 by task syz-executor045/8761 CPU: 0 PID: 8761 Comm: syz-executor045 Not tainted 5.9.0-rc8-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+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 fast_imageblit drivers/video/fbdev/core/sysimgblt.c:229 [inline] sys_imageblit+0x117f/0x1290 drivers/video/fbdev/core/sysimgblt.c:275 drm_fb_helper_sys_imageblit+0x1c/0x180 drivers/gpu/drm/drm_fb_helper.c:767 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline] bit_putcs+0x6e1/0xd20 drivers/video/fbdev/core/bitblit.c:188 fbcon_putcs+0x35a/0x450 drivers/video/fbdev/core/fbcon.c:1308 do_update_region+0x399/0x630 drivers/tty/vt/vt.c:675 redraw_screen+0x658/0x790 drivers/tty/vt/vt.c:1034 fbcon_modechanged+0x593/0x6d0 drivers/video/fbdev/core/fbcon.c:2714 fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:2759 do_fb_ioctl+0x62e/0x690 drivers/video/fbdev/core/fbmem.c:1106 fb_compat_ioctl+0x17c/0xc30 drivers/video/fbdev/core/fbmem.c:1311 __do_compat_sys_ioctl+0x1d3/0x230 fs/ioctl.c:842 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline] __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f58549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f7f531dc EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000004601 RDX: 0000000020000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Memory state around the buggy address: ffffc90009910f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90009910f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90009911000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90009911080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90009911100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ==================================================================