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 AE097CA9EAB for ; Fri, 18 Oct 2019 14:53:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 90E9E222C2 for ; Fri, 18 Oct 2019 14:53:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2634207AbfJROxJ (ORCPT ); Fri, 18 Oct 2019 10:53:09 -0400 Received: from mail-il1-f198.google.com ([209.85.166.198]:43102 "EHLO mail-il1-f198.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with 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1.0 X-Received: by 2002:a92:88cf:: with SMTP id m76mr10823165ilh.40.1571410387414; Fri, 18 Oct 2019 07:53:07 -0700 (PDT) Date: Fri, 18 Oct 2019 07:53:07 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f036110595307db3@google.com> Subject: KMSAN: uninit-value in ld_usb_read (2) From: syzbot To: enric.balletbo@collabora.com, glider@google.com, gregkh@linuxfoundation.org, johan@kernel.org, kirr@nexedi.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, lkundrak@v3.sk, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: c2453450 kmsan: kcov: prettify the code unpoisoning area->.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=12d6dc5f600000 kernel config: https://syzkaller.appspot.com/x/.config?x=3684f3c73f43899a dashboard link: https://syzkaller.appspot.com/bug?extid=fd49690bb45caaacf578 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=157c63d7600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1180adab600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+fd49690bb45caaacf578@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ld_usb_read+0x870/0xc50 drivers/usb/misc/ldusb.c:487 CPU: 1 PID: 12745 Comm: syz-executor511 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x14a/0x2f0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x73/0xf0 mm/kmsan/kmsan_instr.c:245 ld_usb_read+0x870/0xc50 drivers/usb/misc/ldusb.c:487 __vfs_read+0x1a9/0xc90 fs/read_write.c:425 vfs_read+0x359/0x6f0 fs/read_write.c:461 ksys_read+0x265/0x430 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read+0x92/0xb0 fs/read_write.c:595 __x64_sys_read+0x4a/0x70 fs/read_write.c:595 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x4418a9 Code: e8 8c e8 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 cb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd63549848 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004418a9 RDX: 0000000000000002 RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00000000006cc018 R08: 000000000000000f R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402600 R13: 0000000000402690 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags+0x3f/0x90 mm/kmsan/kmsan.c:150 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:364 [inline] kmsan_alloc_page+0x153/0x370 mm/kmsan/kmsan_shadow.c:393 __alloc_pages_nodemask+0x149d/0x60c0 mm/page_alloc.c:4794 alloc_pages_current+0x68d/0x9a0 mm/mempolicy.c:2188 alloc_pages include/linux/gfp.h:511 [inline] kmalloc_order mm/slab_common.c:1303 [inline] kmalloc_order_trace+0x94/0x3f0 mm/slab_common.c:1319 kmalloc_large include/linux/slab.h:485 [inline] __kmalloc+0x2e6/0x430 mm/slub.c:3825 kmalloc_array+0x86/0x110 include/linux/slab.h:618 ld_usb_probe+0x64f/0x1460 drivers/usb/misc/ldusb.c:697 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266 really_probe+0xd91/0x1f90 drivers/base/dd.c:552 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:721 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:828 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:430 __device_attach+0x489/0x750 drivers/base/dd.c:894 device_initial_probe+0x4a/0x60 drivers/base/dd.c:941 bus_probe_device+0x131/0x390 drivers/base/bus.c:490 device_add+0x25b5/0x2df0 drivers/base/core.c:2201 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2536 hub_port_connect drivers/usb/core/hub.c:5098 [inline] hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] port_event drivers/usb/core/hub.c:5359 [inline] hub_event+0x581d/0x72f0 drivers/usb/core/hub.c:5441 process_one_work+0x1572/0x1ef0 kernel/workqueue.c:2269 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 ===================================================== --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches