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incusd/instance/lxc: Tweak SELinux category #2653

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incusd/instance/lxc: Tweak SELinux category #2653

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18 changes: 18 additions & 0 deletions internal/server/instance/drivers/driver_common.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1726,3 +1726,21 @@ func (d *common) setOOMPriority(pid int) error {

return nil
}

// selinuxCategory returns the SELinux category suffix.
func (d *common) selinuxCategory() string {
idStr := strconv.Itoa(d.id)
remaining := len(idStr)

seContext := ""
current := 0
for current != len(idStr) {
length := min(remaining, 3)
seContext += ":c" + idStr[current:current+length]

current += length
remaining -= length
}

return seContext
}
2 changes: 1 addition & 1 deletion internal/server/instance/drivers/driver_lxc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1022,7 +1022,7 @@ func (d *lxc) initLXC(config bool) (*liblxc.Container, error) {

// Setup SELinux.
if d.state.OS.SELinuxAvailable && d.state.OS.SELinuxContextInstanceLXC != "" {
err := lxcSetConfigItem(cc, "lxc.selinux.context", fmt.Sprintf("%s:c%d", d.state.OS.SELinuxContextInstanceLXC, d.id))
err := lxcSetConfigItem(cc, "lxc.selinux.context", fmt.Sprintf("%s%s", d.state.OS.SELinuxContextInstanceLXC, d.selinuxCategory()))
if err != nil {
return nil, err
}
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