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=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 61A45C433FF for ; Sat, 10 Aug 2019 18:15:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 46CC82085B for ; Sat, 10 Aug 2019 18:15:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726192AbfHJSPH (ORCPT ); Sat, 10 Aug 2019 14:15:07 -0400 Received: from mail-ot1-f69.google.com ([209.85.210.69]:35958 "EHLO mail-ot1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726084AbfHJSPH (ORCPT ); Sat, 10 Aug 2019 14:15:07 -0400 Received: by mail-ot1-f69.google.com with SMTP id f11so76015366otq.3 for ; Sat, 10 Aug 2019 11:15:06 -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=MsmEXwped4cbyL6h6bs/KZ2LTHxX7J5FpxmhjfgV7og=; b=IS6UPc4Dn9i4j3s2H104xLQd5yPUaypGMPTb3qulsPsfPOVw3LE4aFSO9hR2Hj2wg+ N0zBoXnt0MNsrYkwH/MiwBtBpLsZ+KC8OVo0VN01AuI5E9Hv3YRGID/18mZt3iML8CUb /aQEkSi4N1QHntQMcNLU81MHiwEa7X4vtvldSS/GuikH54HT/dPgqeiJArnd6/UHn1nk 6t2grd5HtXr33LSiQBEUFxlmxVctHFTwvxjhvSCSxdXA3phQxZ7i0/Og4Q+2+ju1eXAS xN4d/DckQWOSd/HfmBgjWfOHU8gfSafPrK1YYagfeT7Zbe8XUSClURg6UfB7CKb5ExJx rZ1A== X-Gm-Message-State: APjAAAW776Z5ij0YOSxlsKuW1YVJ5M4//DIFoiRlVfR5iWpUe7g1C9aR LtdjJ6T1bSZqH7rb/bGgNy0xQSgoWG6AjL9a+stxjKkt8qzJ X-Google-Smtp-Source: APXvYqzuX78j5MZdD9NknMDpWZDKRcpJUyudMpGZijC4CslADfAYaMDlmkJ3ExpZNosBtrPKqQzkTaBIJ6YYhsvueATdKqFCgLX8 MIME-Version: 1.0 X-Received: by 2002:a02:c6a9:: with SMTP id o9mr29951040jan.90.1565460906127; Sat, 10 Aug 2019 11:15:06 -0700 (PDT) Date: Sat, 10 Aug 2019 11:15:06 -0700 In-Reply-To: <0000000000005c056c058f9a5437@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000383acd058fc745d8@google.com> Subject: Re: BUG: bad usercopy in ld_usb_read From: syzbot To: akpm@linux-foundation.org, allison@lohutok.net, 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, mhund@ld-didactic.de, stern@rowland.harvard.edu, 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 syzbot has found a reproducer for 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=17cf0b16600000 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) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151bab16600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=148f8cd2600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+45b2f40f0778cfa7634e@syzkaller.appspotmail.com ldusb 4-1:0.28: Read buffer overflow, -3222596215958809898 bytes dropped usercopy: Kernel memory exposure attempt detected from process stack (offset 0, size 2147479552)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:98! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 2023 Comm: syz-executor861 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:ffff8881cbda7c40 EFLAGS: 00010282 RAX: 0000000000000061 RBX: ffffffff85cdf100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed10397b4f7a RBP: ffffffff85cdf2c0 R08: 0000000000000061 R09: fffffbfff11acda1 R10: fffffbfff11acda0 R11: ffffffff88d66d07 R12: ffffffff85cdf4e0 R13: ffffffff85cdf100 R14: 000000007ffff000 R15: ffffffff85cdf100 FS: 00007f10bb76a700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7135a49000 CR3: 00000001d20e8000 CR4: 00000000001406e0 Call Trace: __check_object_size mm/usercopy.c:276 [inline] __check_object_size.cold+0x91/0xba 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: 0033:0x446e19 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:00007f10bb769d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446e19 RDX: 00000000ffffffbc RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000f R11: 0000000000000246 R12: 00000000006dbc3c R13: 0001002402090100 R14: 000048c920200f11 R15: 08983baa00000112 Modules linked in: ---[ end trace 93f3613883c53c00 ]--- 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:ffff8881cbda7c40 EFLAGS: 00010282 RAX: 0000000000000061 RBX: ffffffff85cdf100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed10397b4f7a RBP: ffffffff85cdf2c0 R08: 0000000000000061 R09: fffffbfff11acda1 R10: fffffbfff11acda0 R11: ffffffff88d66d07 R12: ffffffff85cdf4e0 R13: ffffffff85cdf100 R14: 000000007ffff000 R15: ffffffff85cdf100 FS: 00007f10bb76a700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7135a49000 CR3: 00000001d20e8000 CR4: 00000000001406e0