LD_PRELOAD undefined symbol: memfd_create

[kp-tux]

Hi, great project!
I successfully compiled the project, but when executing this statement：

LD_PRELOAD=./libbytehound.so ./bytehound serverv

i got:
./bytehound: symbol lookup error: ./libbytehound.so: undefined symbol: memfd_create

and every program is like this
Did I do something wrong？

Information about env：
In docker container (uname -r = 5.10.104-linuxkit)
already install gcc g++

[koute]

What's your libc version?

[ig0rsky]

@koute: Same issue with libc 2.26

[koute]

Currently at least libc 2.27 is required. (Which by itself is almost half a decade old, is the libc in the oldest still publicly supported Ubuntu version, and is older than the libc in Debian's oldstable.)

[quwenzhe]

➜ ldd --version
ldd (GNU libc) 2.27

➜ LD_PRELOAD=./libbytehound.so ./my_service
./cloud-proxy: symbol lookup error: ./libbytehound.so: undefined symbol: memfd_create

I have update libc to 2.2.7, but the issue is happen.