The umask setting hasn't taken effect for some files. Besides manually modifying the permissions, what should I do to grant write permissions to other users for those files that aren't affected?

[Damonyhk]

steps:
mtest@ubuntu:$ (umask 0000; ros2 run demo_nodes_cpp talker)
chric@ubuntu:$ ll /dev/shm | grep fast
-rw-r--r-- 1 mtest mtest 549408 11月 10 17:16 fastrtps_bf60fac662c27812
-rw-rw-rw- 1 mtest mtest 0 11月 10 17:16 fastrtps_bf60fac662c27812_el
-rw-r--r-- 1 mtest mtest 52416 11月 10 17:16 fastrtps_port7411
-rw-rw-rw- 1 mtest mtest 0 11月 10 17:16 fastrtps_port7411_el
-rw-r--r-- 1 mtest mtest 32 11月 10 17:16 sem.fastrtps_port7411_mutex