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/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c
Examining data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/winsock_pointers.c
Examining data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/winsock_pointers.h
Examining data/twisted-20.3.0/src/twisted/python/_sendmsg.c
Examining data/twisted-20.3.0/src/twisted/test/raiser.c

FINAL RESULTS:

data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:742:5:  [4] (buffer) strcpy:
  Does not check for buffer overflows when copying to destination [MS-banned]
  (CWE-120). Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy
  easily misused).
    strcpy(__PYX_DEFAULT_STRING_ENCODING, default_encoding_c);
data/twisted-20.3.0/src/twisted/test/raiser.c:787:5:  [4] (buffer) strcpy:
  Does not check for buffer overflows when copying to destination [MS-banned]
  (CWE-120). Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy
  easily misused).
    strcpy(__PYX_DEFAULT_STRING_ENCODING, default_encoding_c);
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:9563:18:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
            if (!setstate) PyErr_Clear();
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:9564:18:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
            if (!setstate || __Pyx_setup_reduce_is_named(setstate, __pyx_n_s_setstate_cython)) {
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:9564:58:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
            if (!setstate || __Pyx_setup_reduce_is_named(setstate, __pyx_n_s_setstate_cython)) {
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:9585:16:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
    Py_XDECREF(setstate);
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:695:9:  [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 ascii_chars[128];
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:11727:5:  [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 ctversion[4], rtversion[4];
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:11731:9:  [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 message[200];
data/twisted-20.3.0/src/twisted/python/_sendmsg.c:334:13:  [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(cmsg_data, data, data_len);
data/twisted-20.3.0/src/twisted/test/raiser.c:740:9:  [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 ascii_chars[128];
data/twisted-20.3.0/src/twisted/test/raiser.c:3065:5:  [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 ctversion[4], rtversion[4];
data/twisted-20.3.0/src/twisted/test/raiser.c:3069:9:  [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 message[200];
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:620:87:  [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).
#define __Pyx_PyByteArray_FromString(s) PyByteArray_FromStringAndSize((const char*)s, strlen((const char*)s))
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:740:52:  [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).
    __PYX_DEFAULT_STRING_ENCODING = (char*) malloc(strlen(default_encoding_c));
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:3482:54:  [1] (buffer) wcslen:
  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).
    __pyx_t_4 = PyUnicode_FromWideChar(__pyx_v_buff, wcslen(__pyx_v_buff)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 277, __pyx_L1_error)
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:3684:54:  [1] (buffer) wcslen:
  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).
    __pyx_t_6 = PyUnicode_FromWideChar(__pyx_v_buff, wcslen(__pyx_v_buff)); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 290, __pyx_L1_error)
data/twisted-20.3.0/src/twisted/internet/iocpreactor/iocpsupport/iocpsupport.c:11775:65:  [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).
    return __Pyx_PyUnicode_FromStringAndSize(c_str, (Py_ssize_t)strlen(c_str));
data/twisted-20.3.0/src/twisted/test/raiser.c:663:87:  [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).
#define __Pyx_PyByteArray_FromString(s) PyByteArray_FromStringAndSize((const char*)s, strlen((const char*)s))
data/twisted-20.3.0/src/twisted/test/raiser.c:785:52:  [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).
    __PYX_DEFAULT_STRING_ENCODING = (char*) malloc(strlen(default_encoding_c) + 1);
data/twisted-20.3.0/src/twisted/test/raiser.c:3113:65:  [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).
    return __Pyx_PyUnicode_FromStringAndSize(c_str, (Py_ssize_t)strlen(c_str));

ANALYSIS SUMMARY:

Hits = 21
Lines analyzed = 15974 in approximately 0.61 seconds (26249 lines/second)
Physical Source Lines of Code (SLOC) = 12260
Hits@level = [0]   1 [1]   8 [2]   7 [3]   4 [4]   2 [5]   0
Hits@level+ = [0+]  22 [1+]  21 [2+]  13 [3+]   6 [4+]   2 [5+]   0
Hits/KSLOC@level+ = [0+] 1.79445 [1+] 1.71289 [2+] 1.06036 [3+] 0.489396 [4+] 0.163132 [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.