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Bug 2223727

Summary:	Allow access to /dev/udmabuf (dma_device_t) from libvirt qemu (svirt_t)
Product:	Red Hat Enterprise Linux 9	Reporter:	Jonathon Jongsma <jjongsma>
Component:	selinux-policy	Assignee:	Nobody <nobody>
Status:	CLOSED ERRATA	QA Contact:	Milos Malik <mmalik>
Severity:	medium	Docs Contact:
Priority:	high
Version:	9.3	CC:	lvrabec, mmalik, smitterl, zpytela
Target Milestone:	rc	Keywords:	Triaged
Target Release:	9.3	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:	selinux-policy-38.1.22-1.el9	Doc Type:	Bug Fix
Doc Text:	Cause: In rhbz#2032406 is added support blob resources for virtio-vga/virtio-gpu device, which requires access to /dev/udmabuf. u-dma-buf is a Linux device driver that allocates contiguous memory blocks in the kernel space as DMA buffers and makes them available from the user space. Consequence: The missing allow rule causes SELinux denial Fix: Allow svirt to rw /dev/udmabuf Result: No SELinux denials.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-11-07 08:52:40 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2032406

Description Jonathon Jongsma 2023-07-18 16:34:08 UTC

Bug 2032406 adds support for the virtio-gpu 'blob' feature to libvirt. This in turn requires qemu to access /dev/udmabuf. selinux prevents access to this device.

I get the following AVC messages when running in permissive mode:

time->Tue Jul 18 11:29:31 2023
type=PROCTITLE msg=audit(1689697771.305:3860): proctitle=2F7573722F6C6962657865632F71656D752D6B766D002D6E616D650067756573743D76647061626C6F636B2D746573742C64656275672D746872656164733D6F6E002D53002D6F626A656374007B22716F6D2D74797065223A22736563726574222C226964223A226D61737465724B657930222C22666F726D6174223A227261
type=SYSCALL msg=audit(1689697771.305:3860): arch=c000003e syscall=257 success=yes exit=33 a0=ffffff9c a1=55fe1ab9bda6 a2=2 a3=0 items=0 ppid=1 pid=267438 auid=21811 uid=107 gid=107 euid=107 suid=107 fsuid=107 egid=107 sgid=107 fsgid=107 tty=(none) ses=25 comm="qemu-kvm" exe="/usr/libexec/qemu-kvm" subj=unconfined_u:unconfined_r:svirt_t:s0:c190,c1016 key=(null)
type=AVC msg=audit(1689697771.305:3860): avc:  denied  { open } for  pid=267438 comm="qemu-kvm" path="/dev/udmabuf" dev="tmpfs" ino=6 scontext=unconfined_u:unconfined_r:svirt_t:s0:c190,c1016 tcontext=system_u:object_r:dma_device_t:s0 tclass=chr_file permissive=1
type=AVC msg=audit(1689697771.305:3860): avc:  denied  { read write } for  pid=267438 comm="qemu-kvm" name="udmabuf" dev="tmpfs" ino=6 scontext=unconfined_u:unconfined_r:svirt_t:s0:c190,c1016 tcontext=system_u:object_r:dma_device_t:s0 tclass=chr_file permissive=1

Comment 1 Nikola Knazekova 2023-07-27 17:36:02 UTC

Hi Jonathon,

here is PR with the fix: https://github.com/fedora-selinux/selinux-policy/pull/1804

Comment 11 errata-xmlrpc 2023-11-07 08:52:40 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (selinux-policy bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6617