linux-kernel - Re: [PATCH] usbhid: call report_fixup before comparing descriptors

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Tue, 18 Sep 2012 19:21:09 -0700
From:	Kevin Daughtridge <kevin@...u.com>
To:	Henrik Rydberg <rydberg@...omail.se>,
	Sergei Shtylyov <sshtylyov@...sta.com>
CC:	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usbhid: call report_fixup before comparing descriptors

On 09/18/12 09:16 N.U., Henrik Rydberg wrote:
> You can use dev_rdesc here instead.
Hi Henrik. Thanks for the tip. I tried comparing rdesc to hid->dev_rdesc 
without any report_fixup call, but the problem (device nonfunctional 
with "reset_resume error 1" message) still occurred. Upon looking at 
hid_open_report, I noticed that it calls report_fixup on dev_rdesc 
(pointer copied to "start") before it is kmemdup'd to rdesc. For most 
HID drivers, the report_fixup method directly modifies and returns the 
passed structure instead of returning a new pointer, so dev_rdesc is 
also modified. Assuming that dev_rdesc is supposed to be the unmodified 
data, I moved the report_fixup call in hid_open_report to after the 
kmemdup. This combination successfully solves the original problem. I'll 
submit a new patch version presently that addresses both points.

On 09/18/12 05:00 N.U., Sergei Shtylyov wrote:
> Your patch is whitespace damaged, i.e. has all tabs replaced by spaces. 
Hi Sergei. Thanks for catching that. The munging problem was supposedly 
fixed in Thunderbird years ago! I guess I'll just mail the new version 
from the command line.

-Kevin
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/