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[1.1] Fixes inability to use /dev/null when inside a container #3620

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Oct 21, 2022
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[1.1] Fixes inability to use /dev/null when inside a container #3620

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14 changes: 12 additions & 2 deletions libcontainer/cgroups/systemd/common.go
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Original file line number Diff line number Diff line change
Expand Up @@ -293,8 +293,18 @@ func generateDeviceProperties(r *configs.Resources) ([]systemdDbus.Property, err
// rules separately to systemd) we can safely skip entries that don't
// have a corresponding path.
if _, err := os.Stat(entry.Path); err != nil {
logrus.Debugf("skipping device %s for systemd: %s", entry.Path, err)
continue
// Also check /sys/dev so that we don't depend on /dev/{block,char}
// being populated. (/dev/{block,char} is populated by udev, which
// isn't strictly required for systemd). Ironically, this happens most
// easily when starting containerd within a runc created container
// itself.

// We don't bother with securejoin here because we create entry.Path
// right above here, so we know it's safe.
if _, err := os.Stat("/sys" + entry.Path); err != nil {
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logrus.Warnf("skipping device %s for systemd: %s", entry.Path, err)
continue
}
}
}
deviceAllowList = append(deviceAllowList, entry)
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