chmod +x run_root_shell Operation not permitted

[fengve]

libra:/sdcard/test $ ls -l
-rw-rw---- 1 root sdcard_rw 399712 2017-10-14 08:53 run_root_shell
libra:/sdcard/test $

libra:/sdcard/test $ chmod +x run_root_shell
chmod: chmod 'run_root_shell' to 100771: Operation not permitted

[RenaKunisaki]

sdcard is mounted with noexec flag. Try copying to /data/local/tmp and running there.

[startpenghubingzhou]

有没有一种可能，给777权限就够了呢？