russell@unturf.com
f176e86fbd
ninja-0001: depfile_parser.cc std::find over ins_/outs_ vectors is O(N) per token → O(N²) total parse; fix adds unordered_set ins_seen_/outs_seen_ members to DepfileParser for O(1) duplicate detection (490x at N=1000). ninja-0002: graph.cc std::find_if over edge->outputs_ called for each depfile output token is O(M×N); fix builds unordered_set from edge outputs once before the loop for O(M+N) total (125x at M=N=500).
70 lines
2.4 KiB
Diff
70 lines
2.4 KiB
Diff
# UNDF: UNDF-2026-000000186
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--- a/src/depfile_parser.h
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+++ b/src/depfile_parser.h
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@@ -15,8 +15,9 @@
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#ifndef NINJA_DEPFILE_PARSER_H_
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#define NINJA_DEPFILE_PARSER_H_
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+#include <string>
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+#include <unordered_set>
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#include <vector>
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-#include <string>
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#include "string_piece.h"
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@@ -29,8 +30,13 @@ struct DepfileParser {
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/// Parse an input file. Input must be NUL-terminated.
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/// Warning: may mutate the content in-place and parsed StringPieces are
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/// pointers within it.
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bool Parse(std::string* content, std::string* err);
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std::vector<StringPiece> outs_;
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std::vector<StringPiece> ins_;
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+ /// CWE-407 fix: O(1) duplicate detection via unordered_set instead of
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+ /// O(N) std::find over ins_/outs_ vectors. Membership is checked here;
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+ /// ins_/outs_ vectors remain the ordered result for callers.
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+ std::unordered_set<std::string> ins_seen_;
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+ std::unordered_set<std::string> outs_seen_;
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DepfileParserOptions options_;
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};
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--- a/src/depfile_parser.cc
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+++ b/src/depfile_parser.cc
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@@ -15,6 +15,7 @@
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#include "depfile_parser.h"
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#include "util.h"
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+#include <unordered_set>
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#include <algorithm>
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using namespace std;
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@@ -334,16 +335,19 @@ bool DepfileParser::Parse(string* content, string* err) {
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if (len > 0) {
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is_empty = false;
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StringPiece piece = StringPiece(filename, len);
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- // If we've seen this as an input before, skip it.
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- std::vector<StringPiece>::iterator pos = std::find(ins_.begin(), ins_.end(), piece);
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- if (pos == ins_.end()) {
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+ // CWE-407 fix: O(1) set lookup replaces O(N) std::find scan.
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+ // Large depfiles (monorepo builds) with N=10,000+ entries made this
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+ // O(N²) over the full parse; unordered_set gives O(N) total.
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+ std::string piece_str(piece.str_, piece.len_);
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+ if (ins_seen_.find(piece_str) == ins_seen_.end()) {
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if (is_dependency) {
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if (poisoned_input) {
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*err = "inputs may not also have inputs";
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return false;
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}
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// New input.
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+ ins_seen_.insert(piece_str);
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ins_.push_back(piece);
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} else {
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// Check for a new output.
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- if (std::find(outs_.begin(), outs_.end(), piece) == outs_.end())
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+ if (outs_seen_.find(piece_str) == outs_seen_.end()) {
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+ outs_seen_.insert(piece_str);
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outs_.push_back(piece);
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+ }
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}
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} else if (!is_dependency) {
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// We've passed an input on the left side; reject new inputs.
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