linux-kernel - Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 12 Dec 2016 16:05:43 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Andrey Konovalov <andreyknvl@...gle.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        USB list <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns

On Mon, 12 Dec 2016, Andrey Konovalov wrote:

> Hi!
> 
> While running the syzkaller fuzzer I've got the following error report.
> 
> On commit 3c49de52d5647cda8b42c4255cf8a29d1e22eff5 (Dev 2).
> 
> WARNING: CPU: 2 PID: 865 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x8a/0xa0
> gadgetfs: disconnected
> sysfs: cannot create duplicate filename
> '/devices/platform/dummy_hcd.0/usb2/2-1/2-1:64.0/ep_05'
> Kernel panic - not syncing: panic_on_warn set ...

I suppose we could check for USB devices that claim to have two 
endpoints with the same address.  But is it really worthwhile?  A 
kernel warning isn't so bad when you're dealing with buggy device 
firmware.

Alan Stern