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luci-mod-system/startup: dnsmasq restart failed to load names from /tmp/hosts/dhcp.main_dns: Permission denied

See original GitHub issue

Dnsmasq no longer able to read dns files in /tmp/hosts/ after restart via the UI. All files are rw by owner (root) only.

root@u1:/etc/config# ls -l /tmp/hosts/dhcp.main_dns 
-rw-------    1 root     root           151 Oct 30 23:53 /tmp/hosts/dhcp.main_dns
root@u1:/etc/config# logread -e dnsmasq.*dhcp.main_dns
Sat Oct 30 23:53:16 2021 daemon.err dnsmasq[11280]: failed to load names from /tmp/hosts/dhcp.main_dns: Permission denied

Issue Analytics

State:
Created 2 years ago
Comments:8 (8 by maintainers)

Top GitHub Comments

1reaction

dangowrtcommented, Oct 31, 2021

Please check if the patch below resolves both issues (wrong umask inherited from LuCI, missing HOSTFILE_DIR in ujail).

diff --git a/package/network/services/dnsmasq/files/dnsmasq.init b/package/network/services/dnsmasq/files/dnsmasq.init
index 3250b2179b..28cc8b961b 100644
--- a/package/network/services/dnsmasq/files/dnsmasq.init
+++ b/package/network/services/dnsmasq/files/dnsmasq.init
@@ -829,12 +829,14 @@ dnsmasq_start()
        CONFIGFILE_TMP="${CONFIGFILE}.$$"
        HOSTFILE="${BASEHOSTFILE}.${cfg}"
        HOSTFILE_TMP="${HOSTFILE}.$$"
+       HOSTFILE_DIR="$(dirname $HOSTFILE)"
        BASEDHCPSTAMPFILE_CFG="${BASEDHCPSTAMPFILE}.${cfg}"
 
        # before we can call xappend
+       umask u=rwx,g=rx,o=rx
        mkdir -p /var/run/dnsmasq/
        mkdir -p $(dirname $CONFIGFILE)
-       mkdir -p $(dirname $HOSTFILE)
+       mkdir -p "$HOSTFILE_DIR"
        mkdir -p /var/lib/misc
        chown dnsmasq:dnsmasq /var/run/dnsmasq
 
@@ -1154,6 +1156,7 @@ dnsmasq_start()
        procd_add_jail_mount $EXTRA_MOUNT $RFC6761FILE $TRUSTANCHORSFILE
        procd_add_jail_mount $dnsmasqconffile $dnsmasqconfdir $resolvdir $user_dhcpscript
        procd_add_jail_mount /etc/passwd /etc/group /etc/TZ /etc/hosts /etc/ethers
+       [ "$HOSTFILE_DIR" != "/tmp" ] && procd_add_jail_mount "$HOSTFILE_DIR"
        procd_add_jail_mount_rw /var/run/dnsmasq/ $leasefile
 
        procd_close_instance

0reactions

dangowrtcommented, Oct 31, 2021

Should be fixed by https://github.com/openwrt/openwrt/commit/a2fcd3900c0c7c168c4d3c04da189e408860483d

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