[libvirt] [PATCH v2] virt-aa-helper: generate rules for gl enabled graphics devices

[Jamie Strandboge]

On Tue, 22 Jan 2019, Christian Ehrhardt wrote:

> This adds the virt-aa-helper support for gl enabled graphics devices to
> generate rules for the needed rendernode paths.
> 
> Example in domain xml:
> <graphics type='spice'>
>   <gl enable='yes' rendernode='/dev/dri/bar'/>
> </graphics>
> 
> results in:
>   "/dev/dri/bar" rw,
> 
> Special cases are:
> - multiple devices with rendernodes -> all are added
> - non explicit rendernodes -> follow recently added virHostGetDRMRenderNode
> - rendernode without opengl (in egl-headless for example) -> still add
>   the node
> 
> Updates in V2:
> - avoid leaking rendernode
> - logically group patch hunks
> - drop base /dev/dri access
> - simplify detection of the need for a default rendernode
> - add tests in tests/virt-aa-helper-test
> - rebased to recent master
> 
> Fixes: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1757085
> 
> Signed-off-by: Christian Ehrhardt <christian.ehrhardt at canonical.com>
> ---
>  src/security/virt-aa-helper.c | 12 ++++++++++++
>  tests/virt-aa-helper-test     |  6 ++++++
>  2 files changed, 18 insertions(+)
> 
> diff --git a/src/security/virt-aa-helper.c b/src/security/virt-aa-helper.c
> index 64a425671d..a84dd5a8c9 100644
> --- a/src/security/virt-aa-helper.c
> +++ b/src/security/virt-aa-helper.c
> @@ -1062,6 +1062,18 @@ get_files(vahControl * ctl)
>      for (i = 0; i < ctl->def->ngraphics; i++) {
>          virDomainGraphicsDefPtr graphics = ctl->def->graphics[i];
>          size_t n;
> +        const char *rendernode = virDomainGraphicsGetRenderNode(graphics);
> +
> +        if (rendernode)
> +            vah_add_file(&buf, rendernode, "rw");
> +        else
> +            if (virDomainGraphicsNeedsAutoRenderNode(graphics)) {
> +                char * defaultRenderNode = virHostGetDRMRenderNode();
> +                if (defaultRenderNode) {
> +                    vah_add_file(&buf, defaultRenderNode, "rw");
> +                    VIR_FREE(defaultRenderNode);
> +            }
> +        }
>  
>          for (n = 0; n < graphics->nListens; n++) {
>              virDomainGraphicsListenDef listenObj = graphics->listens[n];
> diff --git a/tests/virt-aa-helper-test b/tests/virt-aa-helper-test
> index fb400574dc..6e674bfe5c 100755
> --- a/tests/virt-aa-helper-test
> +++ b/tests/virt-aa-helper-test
> @@ -378,6 +378,12 @@ testme "0" "input dev passthrough" "-r -u $valid_uuid" "$test_xml" "$disk2.*rw,$
>  sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,<memory>524288</memory>,<memory>1048576</memory>,g" -e "s,</devices>,<memory model='nvdimm'><source><path>$disk2</path></source><target><size unit='KiB'>524288</size><node>0</node></target></memory></devices>,g" "$template_xml" > "$test_xml"
>  testme "0" "nvdimm" "-r -u $valid_uuid" "$test_xml" "$disk2.*rw,$"
>  
> +sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,</devices>,<graphics type='egl-headless'><gl rendernode='/dev/dri/testegl1'/></graphics></devices>,g" "$template_xml" > "$test_xml"
> +testme "0" "dri egl" "-r -u $valid_uuid" "$test_xml" "/dev/dri/testegl1.*rw,$"
> +
> +sed -e "s,###UUID###,$uuid,g" -e "s,###DISK###,$disk1,g" -e "s,</devices>,<graphics type='spice'><gl enable='yes' rendernode='/dev/dri/testegl2'/></graphics></devices>,g" "$template_xml" > "$test_xml"
> +testme "0" "dri spice" "-r -u $valid_uuid" "$test_xml" "/dev/dri/testegl2.*rw,$"
> +
>  testme "0" "help" "-h"
>  
>  echo "" >$output
> -- 
> 2.17.1

LGTM. Thanks for the v2 and the tests :)

-- 
Jamie Strandboge             | http://www.canonical.com
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