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-fusefs-0.7.0/ext/fusefs_fuse.h
Examining data/ruby-fusefs-0.7.0/ext/fusefs_fuse.c
Examining data/ruby-fusefs-0.7.0/ext/fusefs_lib.c

FINAL RESULTS:

data/ruby-fusefs-0.7.0/ext/fusefs_fuse.c:40:5:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
    sprintf(buf, "/sbin/umount %s", mounted_at);
data/ruby-fusefs-0.7.0/ext/fusefs_fuse.c:41:5:  [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.
    system(buf);
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:120:3:  [4] (format) vfprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
  vfprintf(stderr,msg,ap);
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:1394:5:  [4] (buffer) sprintf:
  Does not check for buffer overflows (CWE-120). Use sprintf_s, snprintf, or
  vsnprintf.
    sprintf(opts->argv[i], "-o%s", cur);
data/ruby-fusefs-0.7.0/ext/fusefs_fuse.c:36:3:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
  char buf[128];
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:584:3:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
  char open_opts[4], *optr;
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:668:5:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
    memcpy(newfile->value,value,newfile->size);
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:724:7:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
      memcpy(newfile->value,value,newfile->size);
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:1215:3:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
  memcpy(ptr->value + offset, buf, size);
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:1261:5:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
    memcpy(buf, RSTRING_PTR(ret), RSTRING_LEN(ret));
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:1269:5:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
    memcpy(buf, ptr->value + offset, size);
data/ruby-fusefs-0.7.0/ext/fusefs_lib.c:177:11:  [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).
    len = strlen(ptr);

ANALYSIS SUMMARY:

Hits = 12
Lines analyzed = 1687 in approximately 0.06 seconds (29064 lines/second)
Physical Source Lines of Code (SLOC) = 1136
Hits@level = [0]   0 [1]   1 [2]   7 [3]   0 [4]   4 [5]   0
Hits@level+ = [0+]  12 [1+]  12 [2+]  11 [3+]   4 [4+]   4 [5+]   0
Hits/KSLOC@level+ = [0+] 10.5634 [1+] 10.5634 [2+] 9.6831 [3+] 3.52113 [4+] 3.52113 [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.