UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Example URL:
play any swf file 

Steps to reproduce the problem:
1. local httpd server, hosting swf file
2. open chromium with --ppapi-flash-path= argument to include flash plugin libpepflashplayer.so.  Enter URL:localhost 
3. console has error message :error: /usr/lib/chromium/lib/libpepflashplayer.so: cannot open shared object file: Operation not permitted)                                                                                                           

What is the expected behavior?

What went wrong?
[1:1:0409/211559:ERROR:ppapi_thread.cc(301)] Failed to load Pepper module from /usr/lib/chromium/libpepflashplayer.so (error: /usr/lib/chromium/libpepflashplayer.so: cannot open shared object file: Operation not permitted)

Does it occur on multiple sites: Yes

Is it a problem with a plugin? Yes libpepflashplayer.so

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 53.0.2785.143  Channel: dev
OS Version: 10.0
Flash Version: 

I used Yocto (ver 2.2) to generate OS run-time image for i.MX8m.  Chromium is included during the build.  Flash was working on 32bit OS with the same procedure.
 

Deleted: libpepflashplayer.so 18.1 MB

libpepflashplayer.so 18.1 MB Download