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 3AD20ECE599 for ; Thu, 17 Oct 2019 01:42:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id EA26621928 for ; Thu, 17 Oct 2019 01:42:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EA26621928 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9B2B18E0005; Wed, 16 Oct 2019 21:42:13 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 961238E0001; Wed, 16 Oct 2019 21:42:13 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 877EB8E0005; Wed, 16 Oct 2019 21:42:13 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0066.hostedemail.com [216.40.44.66]) by kanga.kvack.org (Postfix) with ESMTP id 669B28E0001 for ; Wed, 16 Oct 2019 21:42:13 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 0086B5DC8 for ; Thu, 17 Oct 2019 01:42:12 +0000 (UTC) X-FDA: 76051576146.08.hour95_4d81bf8d87725 X-HE-Tag: hour95_4d81bf8d87725 X-Filterd-Recvd-Size: 6672 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) by imf28.hostedemail.com (Postfix) with ESMTP for ; Thu, 17 Oct 2019 01:42:12 +0000 (UTC) Received: by mail-il1-f199.google.com with SMTP id d15so143193iln.15 for ; Wed, 16 Oct 2019 18:42:12 -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=PQRjAFW5dVe30Rm5k0ab2lF/+wmycVZIjpbEMijdEW4=; b=BvRQe/tn3Y8Zr5+BhkVCary6nh82aMfCjDoVbwcWDCnMM3QVWajFJGCon6LqXR2ras 2DLq8qoycszkEq35hmK/nIbFAQu8aDqOZrdZXkA9BzpYj7ZtVGy+2yNDRxxILE7qo8ml YNZxKmhDsmVepS/ns61v/0jsBKlXa/tBj2ZOBNk/A185dVh5E/l6ZFFgBdJUCuW9G+15 8xHKFQoBEgE4e7Oo2two76dL3oLpaD8w2bH5YQdHjkUfvkjA6fqcFkXnzUFn5jJV+PD2 jNc4Wwx5Kg9kIyNUUTDCSKPXwk9OdOwpsvMJYToeIOWYkn6ChIa/6kfEu+hwQ9BqWDft GRsg== X-Gm-Message-State: APjAAAVWHFoZcLMnDdmgYhHE87eG7wdJwfe4sxvVQhDwK7ZPq2lcStXk Fh1WdNvw7BhKBs+zCMy1e8YBh3/1Kqm3upPn1TjY2FMHvxXT X-Google-Smtp-Source: APXvYqwuIPj6BjU0d3hgoHxU2oS7zjAiwmbCQIBYswGV9bVJjS86KE/kxeBR13qAEJjicjqxuGI9Vi11Dcyku4xgdOdR0fZ2LwMg MIME-Version: 1.0 X-Received: by 2002:a92:490f:: with SMTP id w15mr970587ila.187.1571276531941; Wed, 16 Oct 2019 18:42:11 -0700 (PDT) Date: Wed, 16 Oct 2019 18:42:11 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000087ce3a0595115382@google.com> Subject: BUG: bad usercopy in ld_usb_read (3) 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, willy@infradead.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello, syzbot found the following crash on: HEAD commit: 22be26f7 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=1756ff77600000 kernel config: https://syzkaller.appspot.com/x/.config?x=387eccb7ac68ec5 dashboard link: https://syzkaller.appspot.com/bug?extid=acee996f6938b9ded381 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+acee996f6938b9ded381@syzkaller.appspotmail.com ldusb 5-1:0.28: Read buffer overflow, 177886378725897 bytes dropped usercopy: Kernel memory exposure attempt detected from process stack (offset 0, size 2147479552)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:99! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 6543 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:99 Code: e8 32 51 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 40 d9 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 46 e3 c0 ff <0f> 0b e8 06 51 d6 ff e8 31 8b fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881d35f7c58 EFLAGS: 00010282 RAX: 0000000000000061 RBX: ffffffff85cdd660 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128bcbd RDI: ffffed103a6bef7d RBP: ffffffff85cdd820 R08: 0000000000000061 R09: fffffbfff11b23be R10: fffffbfff11b23bd R11: ffffffff88d91def R12: ffffffff85cdda40 R13: ffffffff85cdd660 R14: 000000007ffff000 R15: ffffffff85cdd660 FS: 00007fb330338700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f07cea47000 CR3: 00000001cc11e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __check_object_size mm/usercopy.c:282 [inline] __check_object_size.cold+0x91/0xbb mm/usercopy.c:256 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+0x31a/0x760 drivers/usb/misc/ldusb.c:492 __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:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a59 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:00007fb330337c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59 RDX: 00000000ffffffad RSI: 0000000020003200 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb3303386d4 R13: 00000000004c7120 R14: 00000000004dcae8 R15: 00000000ffffffff Modules linked in: ---[ end trace 0fa22c64036b6ebe ]--- RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:99 Code: e8 32 51 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 40 d9 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 46 e3 c0 ff <0f> 0b e8 06 51 d6 ff e8 31 8b fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881d35f7c58 EFLAGS: 00010282 RAX: 0000000000000061 RBX: ffffffff85cdd660 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128bcbd RDI: ffffed103a6bef7d RBP: ffffffff85cdd820 R08: 0000000000000061 R09: fffffbfff11b23be R10: fffffbfff11b23bd R11: ffffffff88d91def R12: ffffffff85cdda40 R13: ffffffff85cdd660 R14: 000000007ffff000 R15: ffffffff85cdd660 FS: 00007fb330338700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f07cea47000 CR3: 00000001cc11e000 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.