linux-kernel - Re: [PATCH] Add support for usbfs zerocopy.

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:	Tue, 5 Jan 2016 22:49:49 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	"Steinar H. Gunderson" <sesse@...gle.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	stern@...land.harvard.edu
Subject: Re: [PATCH] Add support for usbfs zerocopy.

This is a completely broken usage of the mmap interface.  if you use
mmap on a device file you must use the actual mmap for the data
transfer.

Our interface for zero copy reads/writes is O_DIRECT, and that requires
not special memory allocation, just proper alignment.
--
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/