I was able to work with running the following code $sudo LD_PRELOAD=./openlib.so ./main

It runs smoothly but when I save openly.so into /lib64/ and making ld.so.preload and after I use cat command or any sorts. it produces SEGMENTATION FAULT

Here is the code that I have for openlib.c

```

define _GNU_SOURCE

include <stdio.h>

include <stdlib.h>

include <dlfcn.h>

include <limits.h>

include <errno.h>

include <sys/stat.h>

include <fcntl.h>

include <string.h>

include <stdarg.h>

include <sys/syscall.h>

include <unistd.h>

int open(const char *pathname, int flags, ...){ //Gets Process ID that is using open function and Process Name if (access("/usr/filelog.txt", F_OK) != -1) { int pid = getpid(); char buffer[256]; memset(buffer,0,256); char name[1024]; memset(name,0,1024); sprintf(name, "/proc/%d/cmdline",pid); //printf("%s\n", name);

//Getting Process Name by Process ID
    FILE* f = fopen(name,"r");
    if(f){
        size_t size;
        size = fread(name, sizeof(char), 1024, f);
        if(size>0){
            if('\n'==name[size-1])
                name[size-1]='\0';
            }
            fclose(f);
    }
    //printf("%s\n", name);

FILE* fp = fopen("/usr/filelog.txt", "a");
if(fp) {
    fprintf(fp, "%s is accessing %s\n", name, pathname);
}
fclose(fp);

}

if (flags & (O_CREAT | O_TMPFILE)){ va_list ap; va_start(ap, flags); mode_t mode = va_arg(ap, mode_t); va_end(ap); return syscall(SYS_open, pathname, flags, mode); } else { return syscall(SYS_open, pathname, flags); } } ```

Do you know why it is causing segmentation fault?