What is kernel dma protection

From: kernel test robot <[email protected]> To: Jens Axboe <[email protected]kernel.dk> Cc: Dexuan Cui <[email protected]>, Ming Lei <[email protected]>, LKML <linux-kernel@vger.kernel.org>, [email protected], [email protected]

Kernel DMA Protection to protect PCs against drive-by Direct Memory Access (DMA) attacks using PCI hot plug devices connected to Thunderbolt 3 ports. Drive-by DMA. HP - DMA Protection - A Device attempted to access memory that it was not allowed to access We recently enabled both Credential Guard and BitLocker on all our laptops (which seems to have worked fine and not caused any problems). Every once in a while (maybe once a month) somebody will see a warning appear during HP's power cycle.

It provides practical methods to harden the kernel and define capability-based security policies for easy definition of DMA operations with strong security properties. We implemented a D-Box prototype for the Cortex-M3/M4 on top.




DMAEngine client documentation ¶. This book is a guide to device driver writers on how to use the Slave-DMA API of the DMAEngine. This is applicable only for slave DMA usage only.

As usual, Sophos Firewall OS v19.5 is a free upgrade for all licensed Sophos Firewall customers and should be applied to all supported firewall devices as soon as possible, as it not only contains great features and performance enhancements, but also important security fixes. This firmware release will follow our standard update process.

What is DMA mapping and DMA engine in context of linux kernel? The kernel normally uses virtual address. Functions like kmalloc (), vmalloc () normally return virtual address. It can be stored in void*. Virtual memory system converts these addresses to physical addresses. These physical addresses are not actually useful to drivers.