Subject: CVE-2024-27409: dmaengine: dw-edma: HDMA: Add sync read before starting the DMA transfer in remote setup

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: dw-edma: HDMA: Add sync read before starting the DMA transfer in remote setup

The Linked list element and pointer are not stored in the same memory as
the HDMA controller register. If the doorbell register is toggled before
the full write of the linked list a race condition error will occur.
In remote setup we can only use a readl to the memory to assure the full
write has occurred.

The Linux kernel CVE team has assigned CVE-2024-27409 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 6.5 with commit e74c39573d35 and fixed in 6.6.21 with commit 227ef58a9b0c
	Issue introduced in 6.5 with commit e74c39573d35 and fixed in 6.7.9 with commit 17be6f5cb223
	Issue introduced in 6.5 with commit e74c39573d35 and fixed in 6.8 with commit 712a92a48158

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-27409
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/dma/dw-edma/dw-hdma-v0-core.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/227ef58a9b0c372efba422e8886a8015a1509eba
	https://git.kernel.org/stable/c/17be6f5cb223f22e4733ed8fe8b2247cbb677716
	https://git.kernel.org/stable/c/712a92a48158e02155b4b6b21e03a817f78c9b7e