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common: remove unused recursive file enumeration (#681)

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common: don't follow reparse points in the Windows recursive file walk

SysFileFindFiles recurses into every entry carrying
FILE_ATTRIBUTE_DIRECTORY, which on Windows includes directory symlinks
and junctions. A junction pointing at one of its own ancestors makes the
walk recurse until the stack runs out.

The Linux implementation already guards against this: it uses lstat
rather than stat specifically so a symlink is never followed into a
cycle. Skip reparse-point entries on Windows for the same reason.

Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Maayan080
2026-09-20 17:50:57 +03:00
committed by GitHub
parent b8ad1d8c4b
commit c3cc8454b9
6 changed files with 0 additions and 157 deletions
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src/common/platform/sysFileIO.h
-10
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@@ -18,14 +18,6 @@ enum sys_file_cache_type_t {
SYS_FILE_CACHE_SEQUENTIAL_SCAN = 2 // NOLINT(readability-identifier-naming)
};
// NOLINTNEXTLINE(readability-identifier-naming)
struct sys_file_find_t {
std::filesystem::path path_with_name;
SysFileTimeStruct last_access_time;
SysFileTimeStruct last_write_time;
uint64_t size;
};
// NOLINTNEXTLINE(readability-identifier-naming)
struct sys_dir_entry_t {
std::string name;
@@ -75,8 +67,6 @@ bool SysFileSetLastWriteTimeUtc(const std::filesystem::path& name, SysFileTimeSt
bool SysFileSetLastAccessAndWriteTimeUtc(const std::filesystem::path& name,
SysFileTimeStruct& access, SysFileTimeStruct& write);
// NOLINTNEXTLINE(google-runtime-references)
void SysFileFindFiles(const std::filesystem::path& path, std::vector<sys_file_find_t>& out);
// NOLINTNEXTLINE(google-runtime-references)
void SysFileGetDents(const std::filesystem::path& path, std::vector<sys_dir_entry_t>& out);
bool SysFileCopyFile(const std::filesystem::path& src, const std::filesystem::path& dst);
bool SysFileRenameFile(const std::filesystem::path& src, const std::filesystem::path& dst);
src/common/platform/sysLinuxFileIO.cpp
-45
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@@ -610,51 +610,6 @@ bool SysFileSetLastAccessAndWriteTimeUtc(const std::filesystem::path& name,
// }
}
// Recursively collect regular files.
void SysFileFindFiles(const std::filesystem::path& path, std::vector<sys_file_find_t>& out) {
auto real_path = get_internal_name(path);
DIR* dir = opendir(real_path.string().c_str());
if (dir == nullptr) {
return;
}
for (const dirent* entry = readdir(dir); entry != nullptr; entry = readdir(dir)) {
const std::string file_name(entry->d_name);
if (file_name == "." || file_name == "..") {
continue;
}
auto child = real_path / file_name;
struct stat s {};
// lstat, so a symlink is never followed into a cycle during the recursive walk.
if (0 != lstat(child.string().c_str(), &s)) {
continue;
}
if (S_ISDIR(s.st_mode)) {
SysFileFindFiles(child, out);
} else if (S_ISREG(s.st_mode)) {
sys_file_find_t r {};
r.path_with_name = child;
r.size = static_cast<uint64_t>(s.st_size);
r.last_access_time.is_invalid = false;
r.last_access_time.time = s.st_atime;
r.last_access_time.nanos = KYTY_STAT_ATIME_NS(s);
r.last_write_time.is_invalid = false;
r.last_write_time.time = s.st_mtime;
r.last_write_time.nanos = KYTY_STAT_MTIME_NS(s);
out.push_back(r);
}
}
closedir(dir);
}
// Keep "." and ".." to match FindFirstFileW.
void SysFileGetDents(const std::filesystem::path& path, std::vector<sys_dir_entry_t>& out) {
auto real_path = get_internal_name(path);
src/common/platform/sysWindowsFileIO.cpp
-40
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@@ -476,46 +476,6 @@ bool SysFileSetLastAccessAndWriteTimeUtc(const std::filesystem::path& name,
return ok;
}
void SysFileFindFiles(const std::filesystem::path& path, std::vector<sys_file_find_t>& out) {
const auto pattern = path / L"*";
WIN32_FIND_DATAW data {};
HANDLE h = FindFirstFileW(pattern.c_str(), &data);
if (h == INVALID_HANDLE_VALUE) {
return;
}
do {
std::filesystem::path file_name(data.cFileName);
if (file_name == L"." || file_name == L"..") {
continue;
}
const auto full_path = path / file_name;
if ((data.dwFileAttributes & static_cast<DWORD>(FILE_ATTRIBUTE_DIRECTORY)) != 0u) {
SysFileFindFiles(full_path, out);
} else {
sys_file_find_t r {};
r.path_with_name = full_path;
r.size = (static_cast<uint64_t>(data.nFileSizeHigh) << 32u) +
static_cast<uint64_t>(data.nFileSizeLow);
r.last_access_time.is_invalid = false;
r.last_access_time.time = data.ftLastAccessTime;
r.last_write_time.is_invalid = false;
r.last_write_time.time = data.ftLastWriteTime;
out.push_back(std::move(r));
}
} while (FindNextFileW(h, &data) != 0);
FindClose(h);
}
void SysFileGetDents(const std::filesystem::path& path, std::vector<sys_dir_entry_t>& out) {
const auto pattern = path / L"*";