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/i3lock-2.13/xcb.h
Examining data/i3lock-2.13/unlock_indicator.h
Examining data/i3lock-2.13/i3lock.c
Examining data/i3lock-2.13/randr.h
Examining data/i3lock-2.13/dpi.h
Examining data/i3lock-2.13/unlock_indicator.c
Examining data/i3lock-2.13/randr.c
Examining data/i3lock-2.13/xcb.c
Examining data/i3lock-2.13/cursors.h
Examining data/i3lock-2.13/i3lock.h
Examining data/i3lock-2.13/dpi.c

FINAL RESULTS:

data/i3lock-2.13/i3lock.c:706:9:  [4] (buffer) sscanf:
  The scanf() family's %s operation, without a limit specification, permits
  buffer overflows (CWE-120, CWE-20). Specify a limit to %s, or use a
  different input function. If the scanf format is influenceable by an
  attacker, it's exploitable.
    if (sscanf(image_raw_format, fmt, &w, &h, pixfmt) != 3) {
data/i3lock-2.13/i3lock.h:11:13:  [4] (format) fprintf:
  If format strings can be influenced by an attacker, they can be exploited
  (CWE-134). Use a constant for the format specification.
            fprintf(stderr, "[i3lock-debug] " fmt, ##__VA_ARGS__); \
data/i3lock-2.13/i3lock.c:875:33:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
    const char *sleep_lock_fd = getenv("XSS_SLEEP_LOCK_FD");
data/i3lock-2.13/i3lock.c:1041:9:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
    if (getenv("WAYLAND_DISPLAY") != NULL)
data/i3lock-2.13/i3lock.c:1045:17:  [3] (buffer) getopt_long:
  Some older implementations do not protect against internal buffer overflows
  (CWE-120, CWE-20). Check implementation on installation, or limit the size
  of all string inputs.
    while ((o = getopt_long(argc, argv, optstring, longopts, &longoptind)) != -1) {
data/i3lock-2.13/i3lock.c:1112:5:  [3] (random) srand:
  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.
    srand(time(NULL));
data/i3lock-2.13/i3lock.c:1119:50:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
    if ((ret = pam_set_item(pam_handle, PAM_TTY, getenv("DISPLAY"))) != PAM_SUCCESS)
data/i3lock-2.13/i3lock.c:1180:26:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
    const char *locale = getenv("LC_ALL");
data/i3lock-2.13/i3lock.c:1182:18:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
        locale = getenv("LC_CTYPE");
data/i3lock-2.13/i3lock.c:1184:18:  [3] (buffer) getenv:
  Environment variables are untrustable input if they can be set by an
  attacker. They can have any content and length, and the same variable can
  be set more than once (CWE-807, CWE-20). Check environment variables
  carefully before using them.
        locale = getenv("LANG");
data/i3lock-2.13/i3lock.c:60:1:  [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 color[7] = "ffffff";
data/i3lock-2.13/i3lock.c:70:8:  [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.
static char password[512];
data/i3lock-2.13/i3lock.c:391:5:  [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 buffer[128];
data/i3lock-2.13/i3lock.c:521:5:  [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(password + input_position, buffer, n - 1);
data/i3lock-2.13/i3lock.c:703:5:  [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 pixfmt[RAW_PIXFMT_MAXLEN + 1];
data/i3lock-2.13/i3lock.c:727:15:  [2] (misc) fopen:
  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).
    FILE *f = fopen(image_path, "r");
data/i3lock-2.13/i3lock.c:795:22:  [2] (misc) fopen:
  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).
    FILE *png_file = fopen(image_path, "r");
data/i3lock-2.13/i3lock.c:800:14:  [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.
    unsigned char png_header[8];
data/i3lock-2.13/i3lock.c:811:21:  [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.
    static unsigned char PNG_REFERENCE_HEADER[8] = {137, 80, 78, 71, 13, 10, 26, 10};
data/i3lock-2.13/unlock_indicator.c:58:8:  [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.
extern char color[7];
data/i3lock-2.13/unlock_indicator.c:110:5:  [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 strgroups[3][3] = {{color[0], color[1], '\0'},
data/i3lock-2.13/unlock_indicator.c:205:9:  [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 buf[4];
data/i3lock-2.13/xcb.c:77:5:  [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 strgroups[3][3] = {{hex[0], hex[1], '\0'},
data/i3lock-2.13/i3lock.c:180:30:  [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).
    explicit_bzero(password, strlen(password));
data/i3lock-2.13/i3lock.c:1069:21:  [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).
                if (strlen(arg) != 6 || sscanf(arg, "%06[0-9a-fA-F]", color) != 1)
data/i3lock-2.13/xcb.c:41:34:  [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).
        xcb_intern_atom(conn, 0, strlen("_NET_WM_BYPASS_COMPOSITOR"), "_NET_WM_BYPASS_COMPOSITOR"),
data/i3lock-2.13/xcb.c:169:25:  [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).
                        strlen(name),
data/i3lock-2.13/xcb.c:178:30:  [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).
                        2 * (strlen("i3lock") + 1),
data/i3lock-2.13/xcb.c:250:9:  [1] (obsolete) usleep:
  This C routine is considered obsolete (as opposed to the shell command by
  the same name). The interaction of this function with SIGALRM and other
  timer functions such as sleep(), alarm(), setitimer(), and nanosleep() is
  unspecified (CWE-676). Use nanosleep(2) or setitimer(2) instead.
        usleep(50);
data/i3lock-2.13/xcb.c:287:9:  [1] (obsolete) usleep:
  This C routine is considered obsolete (as opposed to the shell command by
  the same name). The interaction of this function with SIGALRM and other
  timer functions such as sleep(), alarm(), setitimer(), and nanosleep() is
  unspecified (CWE-676). Use nanosleep(2) or setitimer(2) instead.
        usleep(50);
data/i3lock-2.13/xcb.c:381:34:  [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).
        xcb_intern_atom(conn, 0, strlen("_NET_ACTIVE_WINDOW"), "_NET_ACTIVE_WINDOW"),

ANALYSIS SUMMARY:

Hits = 31
Lines analyzed = 2646 in approximately 0.11 seconds (25013 lines/second)
Physical Source Lines of Code (SLOC) = 1876
Hits@level = [0]  34 [1]   8 [2]  13 [3]   8 [4]   2 [5]   0
Hits@level+ = [0+]  65 [1+]  31 [2+]  23 [3+]  10 [4+]   2 [5+]   0
Hits/KSLOC@level+ = [0+] 34.6482 [1+] 16.5245 [2+] 12.2601 [3+] 5.33049 [4+] 1.0661 [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.