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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - systemd will change permission of /dev/null when using User=, ExecStop= with StandardInput=tty"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85255">85255</a>
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<th>Summary</th>
<td>systemd will change permission of /dev/null when using User=, ExecStop= with StandardInput=tty
</td>
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<th>Product</th>
<td>systemd
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>general
</td>
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<th>Assignee</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>bernat@luffy.cx
</td>
</tr>
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<th>QA Contact</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
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<p>
<div>
<pre>Hi!
With the following unit:
[Unit]
Description = XBMC Media Center
After = remote-fs.target
After = syslog.target
[Service]
User = xbmc
Group = xbmc
Type = simple
Restart = always
RestartSec = 15
ExecStart = /bin/sleep 3600
ExecStop = /bin/sleep 2
TTYPath = /dev/tty9
StandardInput = tty
StandardOutput = journal
[Install]
WantedBy = multi-user.target
On stop, systemd will change permissions of /dev/null to user xbmc:
crw--w---- 1 xbmc root 1, 3 Oct 19 12:57 /dev/null
systemd 215 (as in Debian Jessie)
Looking at the source code, I suppose the culprit could be exec_spawn()
function (called with ExitStop), checking context->user (true) and checking if
context->std_input is a terminal, which should not be the case for ExecStop
since only the ExecStart process will be leader of the terminal. I suppose
ExecStop stdin is linked to /dev/null.</pre>
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