The following issues were found

Userland/Applications/Piano/AudioPlayerLoop.h
2 issues
There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 20 

              // Wrapper class accepting custom events to advance the track playing and forward audio data to the system.
// This does not run on a separate thread, preventing IPC multithreading madness.
class AudioPlayerLoop : public Core::Object {
    C_OBJECT(AudioPlayerLoop)
public:
    AudioPlayerLoop(TrackManager& track_manager, bool& need_to_write_wav, Audio::WavWriter& wav_writer);

    void enqueue_audio();

Reported by Cppcheck.

There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 20 

              // Wrapper class accepting custom events to advance the track playing and forward audio data to the system.
// This does not run on a separate thread, preventing IPC multithreading madness.
class AudioPlayerLoop : public Core::Object {
    C_OBJECT(AudioPlayerLoop)
public:
    AudioPlayerLoop(TrackManager& track_manager, bool& need_to_write_wav, Audio::WavWriter& wav_writer);

    void enqueue_audio();

Reported by Cppcheck.

Kernel/StdLib.h
2 issues
memcpy - Does not check for buffer overflows when copying to destination
Security

Line: 43 Column: 7 CWE codes: 120
Suggestion: Make sure destination can always hold the source data 

              [[nodiscard]] bool copy_from_user(void*, const void*, size_t);
[[nodiscard]] bool memset_user(void*, int, size_t);

void* memcpy(void*, const void*, size_t);
[[nodiscard]] int strncmp(const char* s1, const char* s2, size_t n);
[[nodiscard]] char* strstr(const char* haystack, const char* needle);
[[nodiscard]] int strcmp(char const*, const char*);
[[nodiscard]] size_t strlen(const char*);
[[nodiscard]] size_t strnlen(const char*, size_t);

Reported by FlawFinder.

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)
Security

Line: 47 Column: 22 CWE codes: 126 

              [[nodiscard]] int strncmp(const char* s1, const char* s2, size_t n);
[[nodiscard]] char* strstr(const char* haystack, const char* needle);
[[nodiscard]] int strcmp(char const*, const char*);
[[nodiscard]] size_t strlen(const char*);
[[nodiscard]] size_t strnlen(const char*, size_t);
void* memset(void*, int, size_t);
[[nodiscard]] int memcmp(const void*, const void*, size_t);
void* memmove(void* dest, const void* src, size_t n);
const void* memmem(const void* haystack, size_t, const void* needle, size_t);

Reported by FlawFinder.

Userland/Libraries/LibC/sys/mman.cpp
2 issues
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)
Security

Line: 18 Column: 112 CWE codes: 126 

              
void* serenity_mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset, size_t alignment, const char* name)
{
    Syscall::SC_mmap_params params { (uintptr_t)addr, size, alignment, prot, flags, fd, offset, { name, name ? strlen(name) : 0 } };
    ptrdiff_t rc = syscall(SC_mmap, &params);
    if (rc < 0 && rc > -EMAXERRNO) {
        errno = -rc;
        return MAP_FAILED;
    }

Reported by FlawFinder.

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)
Security

Line: 66 Column: 67 CWE codes: 126 

                      errno = EFAULT;
        return -1;
    }
    Syscall::SC_set_mmap_name_params params { addr, size, { name, strlen(name) } };
    int rc = syscall(SC_set_mmap_name, &params);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}

int madvise(void* address, size_t size, int advice)

Reported by FlawFinder.

Userland/Games/Hearts/Game.h
2 issues
There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 20 

              namespace Hearts {

class Game final : public GUI::Frame {
    C_OBJECT(Game)
public:
    static constexpr int width = 640;
    static constexpr int height = 480;

    virtual ~Game() override;

Reported by Cppcheck.

There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 20 

              namespace Hearts {

class Game final : public GUI::Frame {
    C_OBJECT(Game)
public:
    static constexpr int width = 640;
    static constexpr int height = 480;

    virtual ~Game() override;

Reported by Cppcheck.

Userland/Applications/MouseSettings/MouseSettingsWindow.h
2 issues
There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 17 

              #include <LibGUI/Window.h>

class MouseSettingsWindow final : public GUI::Window {
    C_OBJECT(MouseSettingsWindow)
public:
    virtual ~MouseSettingsWindow() override;

private:
    MouseSettingsWindow();

Reported by Cppcheck.

There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 17 

              #include <LibGUI/Window.h>

class MouseSettingsWindow final : public GUI::Window {
    C_OBJECT(MouseSettingsWindow)
public:
    virtual ~MouseSettingsWindow() override;

private:
    MouseSettingsWindow();

Reported by Cppcheck.

Userland/Games/Minesweeper/Field.h
2 issues
There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 41 

              };

class Field final : public GUI::Frame {
    C_OBJECT(Field)
    friend class Square;
    friend class SquareLabel;

public:
    Field(GUI::Label& flag_label, GUI::Label& time_label, GUI::Button& face_button, Function<void(Gfx::IntSize)> on_size_changed);

Reported by Cppcheck.

There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 41 

              };

class Field final : public GUI::Frame {
    C_OBJECT(Field)
    friend class Square;
    friend class SquareLabel;

public:
    Field(GUI::Label& flag_label, GUI::Label& time_label, GUI::Button& face_button, Function<void(Gfx::IntSize)> on_size_changed);

Reported by Cppcheck.

Userland/Libraries/LibC/sys/stat.h
2 issues
chmod - This accepts filename arguments; if an attacker can move those files, a race condition results.
Security

Line: 17 Column: 5 CWE codes: 362
Suggestion: Use fchmod( ) instead 

              __BEGIN_DECLS

mode_t umask(mode_t);
int chmod(const char* pathname, mode_t);
int fchmod(int fd, mode_t);
int mkdir(const char* pathname, mode_t);
int mkfifo(const char* pathname, mode_t);
int fstat(int fd, struct stat* statbuf);
int lstat(const char* path, struct stat* statbuf);

Reported by FlawFinder.

umask - Ensure that umask is given most restrictive possible setting (e.g., 066 or 077)
Security

Line: 16 Column: 8 CWE codes: 732 

              
__BEGIN_DECLS

mode_t umask(mode_t);
int chmod(const char* pathname, mode_t);
int fchmod(int fd, mode_t);
int mkdir(const char* pathname, mode_t);
int mkfifo(const char* pathname, mode_t);
int fstat(int fd, struct stat* statbuf);

Reported by FlawFinder.

Userland/Games/Solitaire/Game.h
2 issues
There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 32 

              };

class Game final : public GUI::Frame {
    C_OBJECT(Game)
public:
    static constexpr int width = 640;
    static constexpr int height = 480;

    virtual ~Game() override;

Reported by Cppcheck.

There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 32 

              };

class Game final : public GUI::Frame {
    C_OBJECT(Game)
public:
    static constexpr int width = 640;
    static constexpr int height = 480;

    virtual ~Game() override;

Reported by Cppcheck.

Userland/Applications/MailSettings/MailSettingsWindow.h
2 issues
There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 13 

              #include <LibGUI/Window.h>

class MailSettingsWindow final : public GUI::Window {
    C_OBJECT(MailSettingsWindow)

private:
    MailSettingsWindow();

    void reset_default_values();

Reported by Cppcheck.

There is an unknown macro here somewhere. Configuration is required. If C_OBJECT is a macro then please configure it.
Error

Line: 13 

              #include <LibGUI/Window.h>

class MailSettingsWindow final : public GUI::Window {
    C_OBJECT(MailSettingsWindow)

private:
    MailSettingsWindow();

    void reset_default_values();

Reported by Cppcheck.

Userland/Applications/Mail/MailWidget.cpp
2 issues
syntax error: { . sequence_set
Error

Line: 446 

                  }

    fetch_command = IMAP::FetchCommand {
        .sequence_set { { id_of_email_to_load, id_of_email_to_load } },
        .data_items = {
            IMAP::FetchCommand::DataItem {
                .type = IMAP::FetchCommand::DataItemType::BodySection,
                .section = IMAP::FetchCommand::DataItem::Section {
                    .type = IMAP::FetchCommand::DataItem::SectionType::Parts,

Reported by Cppcheck.

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?
Security

Line: 41 Column: 33 CWE codes: 362 

                  };

    m_web_view->on_link_click = [this](auto& url, auto&, unsigned) {
        if (!Desktop::Launcher::open(url)) {
            GUI::MessageBox::show(
                window(),
                String::formatted("The link to '{}' could not be opened.", url),
                "Failed to open link",
                GUI::MessageBox::Type::Error);

Reported by FlawFinder.