Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/ruby-vmstat-2.3.0/ext/vmstat/hw/bsd.h
Examining data/ruby-vmstat-2.3.0/ext/vmstat/hw/mach.h
Examining data/ruby-vmstat-2.3.0/ext/vmstat/hw/posix.h
Examining data/ruby-vmstat-2.3.0/ext/vmstat/hw/sysctl.h
Examining data/ruby-vmstat-2.3.0/ext/vmstat/hw/statfs.h
Examining data/ruby-vmstat-2.3.0/ext/vmstat/vmstat.c
Examining data/ruby-vmstat-2.3.0/ext/vmstat/vmstat.h

FINAL RESULTS:

data/ruby-vmstat-2.3.0/ext/vmstat/hw/bsd.h:14:8:  [4] (shell) system:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
  long system;
data/ruby-vmstat-2.3.0/ext/vmstat/hw/statfs.h:29:64:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
                                rb_str_new(stat.f_mntfromname, strlen(stat.f_mntfromname)),
data/ruby-vmstat-2.3.0/ext/vmstat/hw/statfs.h:30:62:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
                                rb_str_new(stat.f_mntonname, strlen(stat.f_mntonname)),

ANALYSIS SUMMARY:

Hits = 3
Lines analyzed = 419 in approximately 0.02 seconds (19725 lines/second)
Physical Source Lines of Code (SLOC) = 347
Hits@level = [0]   0 [1]   2 [2]   0 [3]   0 [4]   1 [5]   0
Hits@level+ = [0+]   3 [1+]   3 [2+]   1 [3+]   1 [4+]   1 [5+]   0
Hits/KSLOC@level+ = [0+] 8.64553 [1+] 8.64553 [2+] 2.88184 [3+] 2.88184 [4+] 2.88184 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.