/etc/security/cacerts 只读权限_cp: /system/etc/security/cacerts/9a5ba575.0: read-

问题：文件夹 /etc/security/cacerts 只读权限

beyond1q:/ # cp /data/misc/user/0/cacerts-added/9a5ba575.0  /etc/security/cacerts/
cp: /etc/security/cacerts//9a5ba575.0: Read-only file system

## 实体机，/dev/root 挂载在 /，所以以读写权限重新挂载

HWDUK:/ # echo admin > /etc/security/cacerts/test
/system/bin/sh: can't create /etc/security/cacerts/test: Read-only file system
1|HWDUK:/ # cat /proc/mounts | grep "/ "
/dev/root / ext4 ro,seclabel,relatime,data=ordered 0 0
 
HWDUK:/ # mount -o remount,rw /
 
HWDUK:/ # echo admin > /etc/security/cacerts/test
 
HWDUK:/ # cat /etc/security/cacerts/test
admin

## 模拟器，/dev/block/sda6 挂载在 /system

beyond1q:/ # echo test > /etc/security/cacerts/test
/system/bin/sh: can't create /etc/security/cacerts/test: Read-only file system
beyond1q:/ # cat /proc/mounts | grep "/system "
/dev/block/sda6 /system ext4 rw,seclabel,noatime 0 0
1|beyond1q:/ # mount -o remount,rw /system
beyond1q:/ # echo test > /etc/security/cacerts/test
beyond1q:/ # cat /etc/security/cacerts/test
test