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Create a safe temporary file with is_backup_save_enabled

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This commit is contained in:
ACB 2023-02-12 14:05:48 +01:00
parent 1d0e7f0222
commit 345f5757e5
2 changed files with 16 additions and 5 deletions
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7
drivers/unix/file_access_unix.cpp
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@ -100,6 +100,11 @@ Error FileAccessUnix::open_internal(const String &p_path, int p_mode_flags) {
if (is_backup_save_enabled() && (p_mode_flags == WRITE)) {
save_path = path;
// Create a temporary file in the same directory as the target file.
path = path + "-XXXXXX";
if (!mkstemp(path.utf8().ptrw())) {
return ERR_FILE_CANT_OPEN;
}
path = path + ".tmp";
}
@ -143,7 +148,7 @@ void FileAccessUnix::_close() {
}
if (!save_path.is_empty()) {
int rename_error = rename((save_path + ".tmp").utf8().get_data(), save_path.utf8().get_data());
int rename_error = rename(path.utf8().get_data(), save_path.utf8().get_data());
if (rename_error && close_fail_notify) {
close_fail_notify(save_path);

14
drivers/windows/file_access_windows.cpp
View file

@ -130,10 +130,16 @@ Error FileAccessWindows::open_internal(const String &p_path, int p_mode_flags) {
if (is_backup_save_enabled() && p_mode_flags == WRITE) {
save_path = path;
path = path + ".tmp";
// Create a temporary file in the same directory as the target file.
WCHAR tmpFileName[MAX_PATH];
if (GetTempFileNameW((LPCWSTR)(path.get_base_dir().utf16().get_data()), (LPCWSTR)(path.get_file().utf16().get_data()), 0, tmpFileName) == 0) {
last_error = ERR_FILE_CANT_OPEN;
return last_error;
}
path = tmpFileName;
}
f = _wfsopen((LPCWSTR)(path.utf16().get_data()), mode_string, _SH_DENYNO);
f = _wfsopen((LPCWSTR)(path.utf16().get_data()), mode_string, is_backup_save_enabled() ? _SH_SECURE : _SH_DENYNO);
if (f == nullptr) {
switch (errno) {
@ -178,10 +184,10 @@ void FileAccessWindows::_close() {
if (!PathFileExistsW((LPCWSTR)(save_path.utf16().get_data()))) {
#endif
// Creating new file
rename_error = _wrename((LPCWSTR)((save_path + ".tmp").utf16().get_data()), (LPCWSTR)(save_path.utf16().get_data())) != 0;
rename_error = _wrename((LPCWSTR)(path.utf16().get_data()), (LPCWSTR)(save_path.utf16().get_data())) != 0;
} else {
// Atomic replace for existing file
rename_error = !ReplaceFileW((LPCWSTR)(save_path.utf16().get_data()), (LPCWSTR)((save_path + ".tmp").utf16().get_data()), nullptr, 2 | 4, nullptr, nullptr);
rename_error = !ReplaceFileW((LPCWSTR)(save_path.utf16().get_data()), (LPCWSTR)(path.utf16().get_data()), nullptr, 2 | 4, nullptr, nullptr);
}
if (rename_error) {
attempts--;