mariadb cannot configure the perimission of log file

ls -l /var/log/mysql

total 4496

-rw-rw---- 1 mysql mysql     417 Apr 19 14:20 mysql-bin.000007

-rw-rw---- 1 mysql mysql 4590255 Apr 19 17:03 mysql-bin.000008

-rw-rw---- 1 mysql mysql      64 Apr 19 14:20 mysql-bin.index

ls -l /var/log/

drwx------ 2 mysql mysql     4096 Apr 19 14:20 mysql

-rw-rw---- 1 mysql mysql  3888844 Apr 19 17:04 mysqld-audit.log

-rw-rw---- 1 mysql mysql 52428892 Apr 19 13:52 mysqld-audit.log.1

-rw------- 1 mysql mysql  3328239 Apr 19 14:20 mysqld.log

[mysqld]

skip-name-resolve

datadir=/var/lib/mysql

socket=/var/run/mysql/mysql.sock

pid-file=/var/run/mysql/mysqld.pid

user=mysql

binlog_format=ROW

bind-address=

default_storage_engine=innodb

innodb_autoinc_lock_mode=2

innodb_flush_log_at_trx_commit=0

innodb_buffer_pool_size=122M

max_connections = 1000

server_id = 1

server_audit_logging=ON

plugin_load_add=server_audit

server_audit_events=CONNECT,TABLE

server_audit_file_path=/var/log/mysqld-audit.log

server_audit_file_rotations=5

server_audit_file_rotate_size=52428800

# default to standalone

wsrep_cluster_address=gcomm://

wsrep_sst_method=rsync

character-set-server=UTF8

collation-server=utf8_general_ci

wsrep_retry_autocommit=1000

wsrep_sync_wait=0

secure-file-priv=/tmp

local-infile=0

log-error=/var/log/mysqld.log

sql_mode="STRICT_ALL_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

default_password_lifetime=365

# enable binlog

log_bin=/var/log/mysql/mysql-bin.log

expire_logs_days=10

max_binlog_size=100M

binlog_format=ROW