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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - weston-launch -u doesn't work"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65933">65933</a>
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<th>Assignee</th>
<td>wayland-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>weston-launch -u doesn't work
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>ross@burtonini.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>weston
</td>
</tr>
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<th>Product</th>
<td>Wayland
</td>
</tr></table>
<p>
<div>
<pre>When weston-launch is used as root with the -u option to switch to a non-root
user, the supplementary group list isn't set so this user is a member of root's
group and the primary group of the user (in my situation, the group list is
"root xuser").
This doesn't work too well when permissions on /dev/dri/card0 are root:video
660, because this user isn't currently a member of video (despite /etc/group
saying otherwise). Permission denied, weston fails.
It looks like the solution on Linux would be to use getgrouplist()/setgroups()
before setgid()/setuid().</pre>
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</p>
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