$ cd ~/tmp
$ gcc -fPIC -c -o test.o -x c - <<EOF
#include <stdio.h>
void _init(void) { printf( "TEST\n" ); }
EOF
$ gcc test.o -shared -nostdlib -lgcc -o libtest.so
$ mount | grep ~/tmp
none on /home/x/tmp type tmpfs (rw,noexec,nosuid,nodev,size=2g,uid=1000,gid=1000,mode=0700)
$ LD_PRELOAD=~/tmp/libtest.so uname
ERROR: ld.so: object '/home/x/tmp/libtest.so' from LD_PRELOAD cannot be preloaded: ignored.
Linux
$ su -c "mount -o remount,exec /home/x/tmp"
Password:
$ mount | grep ~/tmp
none on /home/x/tmp type tmpfs (rw,size=2g,uid=1000,gid=1000,mode=0700)
$ LD_PRELOAD=~/tmp/libtest.so uname
TEST
Linux