Hi I'm running an application which uses the USB as disk on key, and I
This application allocate a memory space which isn't initialized, And write it to the scsi device (USB diskonkey), Since the buffer isn't initialize and the App uses a direct mode, which means the buffer isn't Copy from user space to kernel space, when the kernel looks for the physical address of the Buffer it get page exception. The page exception detects that this buffer isn't going to be used for write and its not initialized, Therefore it uses the kernel zero page, which is a reserved page filled with zeros. (used in order to Accelerate page mapping). This page is located at physical address 0. (on the ARM arch) When this page is passed to the USB stack, the USB host mistranslate the buffer with a read request. Fix: The USB stack should check for zero length, and not for zero buffer. (see patch attached) Please comment. Regards Ronen Shitrit Marvell Semiconductor Israel Ltd 6 Hamada Street Mordot HaCarmel Industrial Park Yokneam 20692, ISRAEL Email - [EMAIL PROTECTED] Tel - + 972 4 9091466 Fax - + 972 4 9091501 WWW Page: http://www.marvell.com This message may contain confidential, proprietary or legally privileged information. The information is intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by telephone, or by e-mail and delete the message from your computer.
ehci-q.patch
Description: ehci-q.patch
