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  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Thu, 30 Jan 2014 16:48:41 -0500
From:	Mark Lord <>
To:	Alan Stern <>,
	Sarah Sharp <>
CC:	David Laight <David.Laight@...LAB.COM>,
	"" <>,
	"" <>,
	Greg Kroah-Hartman <>,
	David Miller <>,
	Dan Williams <>,
	"Nyman, Mathias" <>,
	Freddy Xin <>
Subject: Re: [PATCH RFC 1/1] usb: Tell xhci when usb data might be misaligned

On 14-01-30 04:43 PM, Alan Stern wrote:
> On Thu, 30 Jan 2014, Sarah Sharp wrote:
>> It should not matter what alignment or length of scatter-gather list the
>> upper layers pass the xHCI driver, it should just work.  I want to do
>> this fix right, by changing the fundamental way we queue TRBs to the
>> rings to fit the TD rules.  We should break each TD into fragment-sized
>> chunks, and add a link TRB in the middle of a segment where necessary.
> That's a good plan.  However _some_ restriction will turn out to be
> necessary.
> For example, what will you do if a driver submits an SG list containing
> 300 elements, each 3 bytes long?

Allocate a contiguous (bounce) buffer and copy the fragments to/from it?

Mark Lord
Real-Time Remedies Inc.
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists