execute binary file in c

binary.c

int foo(void)
{
	return 666;
}

linker.ld

OUTPUT_FORMAT(binary)

main.c

#include <assert.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(void)
{
	int fd;
	struct stat sb;
	void *addr;

	assert((fd = open("binary",O_RDONLY)) != -1);
	assert(fstat(fd,&sb) != -1);
	assert(addr = mmap(NULL,sb.st_size,PROT_EXEC|PROT_READ,MAP_PRIVATE,fd,0));
	printf("%d\n",(*((int (**)(void))&addr))());
	munmap(addr,sb.st_size);
	close(fd);

	return 0;
}

Makefile

CC := cc
LD := ld
CFLAGS := -pedantic -Wall -Werror -Wextra -std=c89 -fno-stack-protector
LDFLAGS :=

default: main binary

all: clean main binary

%.o: %.c
	$(CC) $(CFLAGS) -c -o $@ $^

main: main.c
	$(CC) $(CFLAGS) -o $@ $^

binary: binary.o
	$(LD) $(LDFLAGS) -o $@ -T linker.ld $^

run: main binary
	./main

clean:
	rm -f main binary binary.o

.PHONY: clean run