Bug 223572

Summary:	drm(4) pmap_mapdev()s PCI space addresses, causing wrong mappings to be generated
Product:	Base System	Reporter:	Justin Hibbits <jhibbits>
Component:	kern	Assignee:	freebsd-x11 (Nobody) <x11>
Status:	Closed FIXED
Severity:	Affects Some People	CC:	cem, zeising
Priority:	---
Version:	CURRENT
Hardware:	powerpc
OS:	Any

Description Justin Hibbits freebsd_committer

2017-11-09 20:02:53 UTC

drm_get_resource_start() gets an rman resource start, which is not always physical address.  On PowerPC, and any architecture that uses OFW/FDT, the resources are specified in PCI space, not physical address space.  This causes the wrong mappings to be generated, potentially stomping on real memory.

Comment 1 Niclas Zeising freebsd_committer

2019-07-10 08:43:14 UTC

Hi!
Is this still an issue?

Comment 2 Justin Hibbits freebsd_committer

2019-07-10 21:00:24 UTC

No longer an issue.  The issue was fixed in github 1e4fa87.