[9front] executable files in '#e'

[9front] executable files in '#e'

[mkf9]

few days ago i noticed this behaviour on /env,

cpu% hold /env/test
cat: can't open /env/test: '/env/test' file does not exist
#!/bin/rc
echo hello world
cpu% ls -l /env/test
--rw-rw-rw- e 0 mkf mkf 27 Jul 18  2021 /env/test
cpu% /env/test
hello world
cpu%

it executes empty c programs as well, but i couldn't fit programs that 
do something visable inside /env.

is it a security bug?
if yes, a possible attack could be creation of new variable and 
executing it where we don't have file creation access.