Hello. We've been using Dnsmasq version 2.78 for quite a while but upgraded to 2.81 because of CVE-2019-14834. Upon inspecting the output of lsof we realized that Dnsmasq is using almost 200 file descriptors upon boot and after an hour later the number remains unchanged. Since I knew this did not happen with 2.78 I also tried Dnsmasq versions 2.79 and 2.80 and this does not happen. It looks like it started with 2.81 and also happens with 2.82. My operating environment is armv7l GNU/Linux.
Here's an example of (clipped) output of lsof: version 2.81 (195 file descriptors open) dnsmasq 1222 nobody 187u inet 2847 UDP 10.10.12.1:53 dnsmasq 1222 nobody 188u sock 0,7 2849 can't identify protocol dnsmasq 1222 nobody 189u inet 2853 UDP 10.10.15.1:53 dnsmasq 1222 nobody 190u inet 2855 UDP 10.10.12.1:53 dnsmasq 1222 nobody 191u sock 0,7 2857 can't identify protocol dnsmasq 1222 nobody 192u inet 2886 UDP 10.10.15.1:53 dnsmasq 1222 nobody 193u inet 2888 UDP 10.10.12.1:53 dnsmasq 1222 nobody 194u sock 0,7 2890 can't identify protocol dnsmasq 1222 nobody 195u sock 0,7 2893 can't identify protocol [root@U115 ~]# dnsmasq -v Dnsmasq version 2.81 Copyright (c) 2000-2020 Simon Kelley version 2.80 dnsmasq 4893 nobody 10r 0000 0,9 0 6 anon_inode dnsmasq 4893 nobody 11r FIFO 0,8 6848 pipe dnsmasq 4893 nobody 12w FIFO 0,8 6848 pipe dnsmasq 4893 nobody 13u unix 0xf7791905 6850 socket [root@U115 ~]# dnsmasq -v Dnsmasq version 2.80 Copyright (c) 2000-2018 Simon Kelley version 2.79 dnsmasq 466 nobody 7u inet 1760 TCP 127.0.0.1:53 (LISTEN) dnsmasq 466 nobody 8u inet 1761 UDP 127.0.0.1:53 dnsmasq 466 nobody 9u inet 1762 TCP 127.0.0.1:53 (LISTEN) dnsmasq 466 nobody 10r 0000 0,9 0 6 anon_inode dnsmasq 466 nobody 11r FIFO 0,8 1763 pipe dnsmasq 466 nobody 12w FIFO 0,8 1763 pipe dnsmasq 466 nobody 13u unix 0xea856025 1765 socket [root@U115 ~]# dnsmasq -v Dnsmasq version 2.79 Copyright (c) 2000-2018 Simon Kelley version 2.78 dnsmasq 430 nobody 10r 0000 0,9 0 6 anon_inode dnsmasq 430 nobody 11r FIFO 0,8 460 pipe dnsmasq 430 nobody 12w FIFO 0,8 460 pipe dnsmasq 430 nobody 13u unix 0xcc699e5c 462 socket [root@U115 ~]# dnsmasq -v Dnsmasq version 2.78 Copyright (c) 2000-2017 Simon Kelley .
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