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rules: Add uaccess tag to /dev/udmabuf

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In some cases userspace may need to create dmabuffers from userspace
on such example is the software ISP part of libcamera which needs to
allocate dma-buffers for the output of the software ISP.

At first the plan was to allow console users access to /dev/dma_heap/*,
this was discussed with various kernel folks here:
https://lore.kernel.org/all/bb372250-e8b8-4458-bc99-dd8365b06991@redhat.com/

Giving console users access to the dma_heap's was deemed a bad idea
because memory allocated this way is not accounted in cgroup limits.

Giving access to /dev/udmabuf OTOH was deemed acceptable so that
is what this patch adds.

Resolves: #32662
This commit is contained in:
Hans de Goede
2024-07-16 17:46:09 +02:00
committed by Lennart Poettering
parent fa96c55b7b
commit fd820e76e4
1 changed files with 2 additions and 0 deletions
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rules.d/70-uaccess.rules.in
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@@ -34,6 +34,8 @@ SUBSYSTEM=="sound", TAG+="uaccess", \
SUBSYSTEM=="video4linux", TAG+="uaccess"
SUBSYSTEM=="dvb", TAG+="uaccess"
SUBSYSTEM=="media", TAG+="uaccess"
# libcamera software ISP used with some cams requires udmabuf access
KERNEL=="udmabuf", TAG+="uaccess"
# industrial cameras, some webcams, camcorders, set-top boxes, TV sets, audio devices, and more
SUBSYSTEM=="firewire", TEST=="units", ENV{IEEE1394_UNIT_FUNCTION_MIDI}=="1", TAG+="uaccess"