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=unavailable 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 5388DC0650F for ; Thu, 8 Aug 2019 12:38:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2A6B621874 for ; Thu, 8 Aug 2019 12:38:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732438AbfHHMiH (ORCPT ); Thu, 8 Aug 2019 08:38:07 -0400 Received: from mail-ot1-f71.google.com ([209.85.210.71]:38392 "EHLO mail-ot1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726285AbfHHMiH (ORCPT ); Thu, 8 Aug 2019 08:38:07 -0400 Received: by mail-ot1-f71.google.com with SMTP id j4so61506391otc.5 for ; Thu, 08 Aug 2019 05:38:07 -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:message-id:subject:from:to; bh=tgS7L48eHOQSpr+oZVkwi0R27Me8DH37A1UrEs6B3Ms=; b=FOTMtrWqLD9321a6alLT5a4iDxv98IrBv2Iyj6yM783sVik02xjBwwwswg38g4QlXL iv68hj7b8Wlam9xrKEDmVaAaw10/8pCaUZZpJJ1FhfcqxJcjJLOMfbAcJQO2WX4thjHA Ql8BBJB6pzNu6shoYSBqMtKaUQVyRLPmVphMs0YBu7u5dFBAhzPx1RVUsfKjlgr7QI/U ZTPYSQ2l+5HmV00BBgM9ZQbX4FVzFDGtBaUrfR0QUmg/ac5Jtv1HRoTnJih1p8UdbQAn PkLtg5hzgOkKnfT+aJ0CT3tpnDu4QsuajFgOXEOqv7QpE8cN2WxF2hGaSU80fYYHK5p/ Tg+A== X-Gm-Message-State: APjAAAUVo022K5vY3Z3WGCBr34pcHxW8KZcBAd/s4l3cS2k8CGU0TSkk vME54d9JZ8TXvvt7OrKzhfxBAYC0GzFCJ9igzpfMRX2XDXUG X-Google-Smtp-Source: APXvYqzfz3subnIk/sSUAuycYkgWhqVqk7+A5uJekseoGm+xV7U926JT3SWWTJ1uL0WiymxGOnQeP/+DtGOdZiNfJFg719VJG9Uf MIME-Version: 1.0 X-Received: by 2002:a02:54c1:: with SMTP id t184mr16701744jaa.10.1565267886602; Thu, 08 Aug 2019 05:38:06 -0700 (PDT) Date: Thu, 08 Aug 2019 05:38:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005c056c058f9a5437@google.com> Subject: BUG: bad usercopy in ld_usb_read From: syzbot To: akpm@linux-foundation.org, andreyknvl@google.com, cai@lca.pw, gregkh@linuxfoundation.org, keescook@chromium.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: e96407b4 usb-fuzzer: main usb gadget fuzzer driver git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=13aeaece600000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e dashboard link: https://syzkaller.appspot.com/bug?extid=45b2f40f0778cfa7634e 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+45b2f40f0778cfa7634e@syzkaller.appspotmail.com ldusb 6-1:0.124: Read buffer overflow, -131383996186150 bytes dropped usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-2k' (offset 8, size 65062)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:98! invalid opcode: 0000 [#1] SMP KASAN CPU: 0 PID: 15185 Comm: syz-executor.2 Not tainted 5.3.0-rc2+ #25 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 Code: e8 c1 f7 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 e0 f3 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 15 98 c1 ff <0f> 0b e8 95 f7 d6 ff e8 80 9f fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881ccb3fc38 EFLAGS: 00010286 RAX: 0000000000000067 RBX: ffffffff86a659d4 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed1039967f79 RBP: ffffffff85cdf2c0 R08: 0000000000000067 R09: fffffbfff11acdaa R10: fffffbfff11acda9 R11: ffffffff88d66d4f R12: ffffffff86a696e8 R13: ffffffff85cdf180 R14: 000000000000fe26 R15: ffffffff85cdf140 FS: 00007ff6daf91700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1de6600000 CR3: 00000001ca554000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __check_heap_object+0xdd/0x110 mm/slub.c:3914 check_heap_object mm/usercopy.c:234 [inline] __check_object_size mm/usercopy.c:280 [inline] __check_object_size+0x32d/0x39b mm/usercopy.c:250 check_object_size include/linux/thread_info.h:119 [inline] check_copy_size include/linux/thread_info.h:150 [inline] copy_to_user include/linux/uaccess.h:151 [inline] ld_usb_read+0x304/0x780 drivers/usb/misc/ldusb.c:495 __vfs_read+0x76/0x100 fs/read_write.c:425 vfs_read+0x1ea/0x430 fs/read_write.c:461 ksys_read+0x1e8/0x250 fs/read_write.c:587 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff6daf90c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829 RDX: 000000000000fe26 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff6daf916d4 R13: 00000000004c6c73 R14: 00000000004dbee8 R15: 00000000ffffffff Modules linked in: ---[ end trace 4fe8dba032d24ceb ]--- RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 Code: e8 c1 f7 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 e0 f3 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 15 98 c1 ff <0f> 0b e8 95 f7 d6 ff e8 80 9f fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881ccb3fc38 EFLAGS: 00010286 RAX: 0000000000000067 RBX: ffffffff86a659d4 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed1039967f79 RBP: ffffffff85cdf2c0 R08: 0000000000000067 R09: fffffbfff11acdaa R10: fffffbfff11acda9 R11: ffffffff88d66d4f R12: ffffffff86a696e8 R13: ffffffff85cdf180 R14: 000000000000fe26 R15: ffffffff85cdf140 FS: 00007ff6daf91700(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1de6600000 CR3: 00000001ca554000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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.