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,URIBL_BLOCKED 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 43432C4CECD for ; Mon, 16 Sep 2019 18:49:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1DFB220665 for ; Mon, 16 Sep 2019 18:49:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390651AbfIPStf (ORCPT ); Mon, 16 Sep 2019 14:49:35 -0400 Received: from mail-io1-f70.google.com ([209.85.166.70]:35829 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390511AbfIPStM (ORCPT ); Mon, 16 Sep 2019 14:49:12 -0400 Received: by mail-io1-f70.google.com with SMTP id 18so1181063iof.2 for ; Mon, 16 Sep 2019 11:49:11 -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=BWUhYr5I0gvS0fShhXckcm/OWj5Paob17MJ2Hn7ceY0=; b=kG9vEbBypJoEBwLsOCw0f+zOusnOVPLY5G7EazPh3Y2EWr2Xh1XzdB+BGSMJkWjkM7 cK12rtA1nBl3TVHb9MoCez/eBqFmf++PqH7Gsn4HaVWb0Zy3qITx4ml3GYPlOoyeZ0Mc nFjXGg+BNnlBvqoEBqfvLd5u0oBYZb9aYa8Qnz5/DO7cBGWVV4fTw7PvaTyDwZuY/NBV MAyT5UslEdaBul6omE+VsdPMEgHRtNbQL+32U5WvBDDwn1+3FBFfsJIb4dx9zvLurFD0 AWB9OU2WiR50/0q87HKkk88mroHWPsZelISkOjE/paz6GvY2xa5bjtZLNj0rR7cXx9Y2 YwNw== X-Gm-Message-State: APjAAAXUinZ5HIjT7N/bm72I+NnxRiwM0CWMHW1J7WGHgjmb/WIcOYVn EILr0/eQuoIk2LnYPAAXoMb4zBadPYCgrYFp15T1SY+OryUp X-Google-Smtp-Source: APXvYqzrwpCm3kJA+hdMmImrFj68ACD9mAM46xaSDIDY3qjyC6nMnP08/1pttdOsVqlNT4T8pgKOYv3WkxPiQNbBU6CSFaZJKm24 MIME-Version: 1.0 X-Received: by 2002:a02:245:: with SMTP id 66mr1506031jau.30.1568659750909; Mon, 16 Sep 2019 11:49:10 -0700 (PDT) Date: Mon, 16 Sep 2019 11:49:10 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003a00b70592b00f85@google.com> Subject: BUG: bad usercopy in ld_usb_read (2) From: syzbot To: akpm@linux-foundation.org, andreyknvl@google.com, cai@lca.pw, info@metux.net, isaacm@codeaurora.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, william.kucharski@oracle.com 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: f0df5c1b 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=1681c9c1600000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5 dashboard link: https://syzkaller.appspot.com/bug?extid=4cd8c1b2445d0ffe05f6 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+4cd8c1b2445d0ffe05f6@syzkaller.appspotmail.com ldusb 5-1:0.98: Read buffer overflow, 4466454212372071848 bytes dropped usercopy: Kernel memory exposure attempt detected from process stack (offset 0, size 536871625)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:98! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 17170 Comm: syz-executor.4 Not tainted 5.3.0-rc7+ #0 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 62 f0 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 c0 f7 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 c6 91 c1 ff <0f> 0b e8 36 f0 d6 ff e8 a1 90 fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881d308fc40 EFLAGS: 00010282 RAX: 0000000000000060 RBX: ffffffff85cdf4e0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81288ddd RDI: ffffed103a611f7a RBP: ffffffff85cdf6a0 R08: 0000000000000060 R09: fffffbfff11ad7a3 R10: fffffbfff11ad7a2 R11: ffffffff88d6bd17 R12: ffffffff85cdf8c0 R13: ffffffff85cdf4e0 R14: 00000000200002c9 R15: ffffffff85cdf4e0 FS: 00007fc613f93700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f983cbbf000 CR3: 00000001cc33e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __check_object_size mm/usercopy.c:276 [inline] __check_object_size.cold+0x91/0xbb 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: 0033:0x4598e9 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:00007fc613f92c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9 RDX: 00000000200002c9 RSI: 0000000020000280 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc613f936d4 R13: 00000000004c6d1a R14: 00000000004dc0c0 R15: 00000000ffffffff Modules linked in: ---[ end trace b440da0257bb7015 ]--- RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 Code: e8 62 f0 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 c0 f7 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 c6 91 c1 ff <0f> 0b e8 36 f0 d6 ff e8 a1 90 fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881d308fc40 EFLAGS: 00010282 RAX: 0000000000000060 RBX: ffffffff85cdf4e0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81288ddd RDI: ffffed103a611f7a RBP: ffffffff85cdf6a0 R08: 0000000000000060 R09: fffffbfff11ad7a3 R10: fffffbfff11ad7a2 R11: ffffffff88d6bd17 R12: ffffffff85cdf8c0 R13: ffffffff85cdf4e0 R14: 00000000200002c9 R15: ffffffff85cdf4e0 FS: 00007fc613f93700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f983cbbf000 CR3: 00000001cc33e000 CR4: 00000000001406e0 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.