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/gap-io-4.7.0+ds/src/io.c

FINAL RESULTS:

data/gap-io-4.7.0+ds/src/io.c:671:13:  [5] (race) readlink:
  This accepts filename arguments; if an attacker can move those files or
  change the link content, a race condition results. Also, it does not
  terminate with ASCII NUL. (CWE-362, CWE-20). Reconsider approach.
      res = readlink(CSTR_STRING(path),
data/gap-io-4.7.0+ds/src/io.c:835:13:  [5] (race) chmod:
  This accepts filename arguments; if an attacker can move those files, a
  race condition results. (CWE-362). Use fchmod( ) instead.
      res = chmod(CSTR_STRING(pathname),INT_INTOBJ(mode));
data/gap-io-4.7.0+ds/src/io.c:872:13:  [5] (race) chown:
  This accepts filename arguments; if an attacker can move those files, a
  race condition results. (CWE-362). Use fchown( ) instead.
      res = chown(CSTR_STRING(path),
data/gap-io-4.7.0+ds/src/io.c:1558:9:  [4] (shell) execv:
  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.
    i = execv(CSTR_STRING(path),argv);
data/gap-io-4.7.0+ds/src/io.c:1593:9:  [4] (shell) execvp:
  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.
    i = execvp(CSTR_STRING(file),argv);
data/gap-io-4.7.0+ds/src/io.c:363:13:  [2] (misc) open:
  Check when opening files - can an attacker redirect it (via symlinks),
  force the opening of special file type (e.g., device files), move things
  around to create a race condition, control its ancestors, or change its
  contents? (CWE-362).
      res = open(CSTR_STRING(path),
data/gap-io-4.7.0+ds/src/io.c:704:3:  [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[GAP_PATH_MAX];
data/gap-io-4.7.0+ds/src/io.c:949:14:  [2] (tmpfile) mkstemp:
  Potential for temporary file vulnerability in some circumstances. Some
  older Unix-like systems create temp files with permission to write by all
  by default, so be sure to set the umask to override this. Also, some older
  Unix systems might fail to use O_EXCL when opening the file, so make sure
  that O_EXCL is used by the library (CWE-377).
        fd = mkstemp(CSTR_STRING(template));
data/gap-io-4.7.0+ds/src/io.c:1126:7:  [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(&(sa.sin_addr.s_addr),CHARS_STRING(ip),4);
data/gap-io-4.7.0+ds/src/io.c:1128:7:  [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(CHARS_STRING(res),&sa,sizeof(sa));
data/gap-io-4.7.0+ds/src/io.c:1172:11:  [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(CHARS_STRING(tmp), *p, he->h_length);
data/gap-io-4.7.0+ds/src/io.c:1535:5:  [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 *argv[1024];   /* Up to 1024 arguments */
data/gap-io-4.7.0+ds/src/io.c:1570:5:  [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 *argv[1024];   /* Up to 1024 arguments */
data/gap-io-4.7.0+ds/src/io.c:1605:5:  [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 *argv[1024];   /* Up to 1024 arguments */
data/gap-io-4.7.0+ds/src/io.c:1606:5:  [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 *envp[1024];   /* Up to 1024 environment entries */
data/gap-io-4.7.0+ds/src/io.c:1832:7:  [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(CHARS_STRING(res),&sa,sa_len);
data/gap-io-4.7.0+ds/src/io.c:1841:3:  [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 name[256];
data/gap-io-4.7.0+ds/src/io.c:1850:3:  [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(CHARS_STRING(res),name,i);
data/gap-io-4.7.0+ds/src/io.c:402:11:  [1] (buffer) read:
  Check buffer boundaries if used in a loop including recursive loops
  (CWE-120, CWE-20).
  bytes = read(INT_INTOBJ(fd),CHARS_STRING(st)+INT_INTOBJ(offset),
data/gap-io-4.7.0+ds/src/io.c:1848:7:  [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).
  i = strlen(name);

ANALYSIS SUMMARY:

Hits = 20
Lines analyzed = 3020 in approximately 0.10 seconds (30322 lines/second)
Physical Source Lines of Code (SLOC) = 2685
Hits@level = [0]   2 [1]   2 [2]  13 [3]   0 [4]   2 [5]   3
Hits@level+ = [0+]  22 [1+]  20 [2+]  18 [3+]   5 [4+]   5 [5+]   3
Hits/KSLOC@level+ = [0+] 8.19367 [1+] 7.44879 [2+] 6.70391 [3+] 1.8622 [4+] 1.8622 [5+] 1.11732
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.