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Everywhere: Explicitly specify the size in StringView constructors

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This commit moves the length calculations out to be directly on the
StringView users. This is an important step towards the goal of removing
StringView(char const*), as it moves the responsibility of calculating
the size of the string to the user of the StringView (which will prevent
naive uses causing OOB access).
This commit is contained in:
sin-ack 2022-07-11 19:53:29 +00:00 • committed by Andreas Kling
parent e3da0adfe6
commit c70f45ff44
75 changed files with 264 additions and 203 deletions
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22
Userland/Libraries/LibCore/Account.cpp
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@ -40,7 +40,7 @@ static String get_salt()
static Vector<gid_t> get_extra_gids(passwd const& pwd)
{
StringView username { pwd.pw_name };
StringView username { pwd.pw_name, strlen(pwd.pw_name) };
Vector<gid_t> extra_gids;
setgrent();
for (auto* group = getgrent(); group; group = getgrent()) {
@ -78,7 +78,7 @@ ErrorOr<Account> Account::self([[maybe_unused]] Read options)
spwd spwd = {};
#ifndef AK_OS_BSD_GENERIC
if (options != Read::PasswdOnly) {
auto maybe_spwd = TRY(Core::System::getspnam(pwd->pw_name));
auto maybe_spwd = TRY(Core::System::getspnam({ pwd->pw_name, strlen(pwd->pw_name) }));
if (!maybe_spwd.has_value())
return Error::from_string_literal("No shadow entry for user"sv);
spwd = maybe_spwd.release_value();
@ -90,14 +90,14 @@ ErrorOr<Account> Account::self([[maybe_unused]] Read options)
ErrorOr<Account> Account::from_name(char const* username, [[maybe_unused]] Read options)
{
auto pwd = TRY(Core::System::getpwnam(username));
auto pwd = TRY(Core::System::getpwnam({ username, strlen(username) }));
if (!pwd.has_value())
return Error::from_string_literal("No such user"sv);
spwd spwd = {};
#ifndef AK_OS_BSD_GENERIC
if (options != Read::PasswdOnly) {
auto maybe_spwd = TRY(Core::System::getspnam(pwd->pw_name));
auto maybe_spwd = TRY(Core::System::getspnam({ pwd->pw_name, strlen(pwd->pw_name) }));
if (!maybe_spwd.has_value())
return Error::from_string_literal("No shadow entry for user"sv);
spwd = maybe_spwd.release_value();
@ -115,7 +115,7 @@ ErrorOr<Account> Account::from_uid(uid_t uid, [[maybe_unused]] Read options)
spwd spwd = {};
#ifndef AK_OS_BSD_GENERIC
if (options != Read::PasswdOnly) {
auto maybe_spwd = TRY(Core::System::getspnam(pwd->pw_name));
auto maybe_spwd = TRY(Core::System::getspnam({ pwd->pw_name, strlen(pwd->pw_name) }));
if (!maybe_spwd.has_value())
return Error::from_string_literal("No shadow entry for user"sv);
spwd = maybe_spwd.release_value();
@ -270,18 +270,22 @@ ErrorOr<void> Account::sync()
auto new_shadow_file_content = TRY(generate_shadow_file());
#endif
// FIXME: mkstemp taking Span<char> makes this code entirely un-AKable.
// Make this code less char-pointery.
char new_passwd_name[] = "/etc/passwd.XXXXXX";
size_t new_passwd_name_length = strlen(new_passwd_name);
#ifndef AK_OS_BSD_GENERIC
char new_shadow_name[] = "/etc/shadow.XXXXXX";
size_t new_shadow_name_length = strlen(new_shadow_name);
#endif
{
auto new_passwd_fd = TRY(Core::System::mkstemp(new_passwd_name));
auto new_passwd_fd = TRY(Core::System::mkstemp({ new_passwd_name, new_passwd_name_length }));
ScopeGuard new_passwd_fd_guard = [new_passwd_fd] { close(new_passwd_fd); };
TRY(Core::System::fchmod(new_passwd_fd, 0644));
#ifndef AK_OS_BSD_GENERIC
auto new_shadow_fd = TRY(Core::System::mkstemp(new_shadow_name));
auto new_shadow_fd = TRY(Core::System::mkstemp({ new_shadow_name, new_shadow_name_length }));
ScopeGuard new_shadow_fd_guard = [new_shadow_fd] { close(new_shadow_fd); };
TRY(Core::System::fchmod(new_shadow_fd, 0600));
#endif
@ -295,9 +299,9 @@ ErrorOr<void> Account::sync()
#endif
}
TRY(Core::System::rename(new_passwd_name, "/etc/passwd"));
TRY(Core::System::rename({ new_passwd_name, new_passwd_name_length }, "/etc/passwd"sv));
#ifndef AK_OS_BSD_GENERIC
TRY(Core::System::rename(new_shadow_name, "/etc/shadow"));
TRY(Core::System::rename({ new_shadow_name, new_shadow_name_length }, "/etc/shadow"sv));
#endif
return {};