systemd/SOURCES/0681-lgtm-replace-the-query-used-for-looking-for-fgets-wi.patch
2022-01-19 21:25:07 +00:00

85 lines
2.7 KiB
Diff

From c4a34b71d4f51f071f7a722059e36388b41d30e4 Mon Sep 17 00:00:00 2001
From: Evgeny Vereshchagin <evvers@ya.ru>
Date: Mon, 11 Mar 2019 21:05:13 +0100
Subject: [PATCH] lgtm: replace the query used for looking for fgets with a
more general query
to make it easier to comlain about `strtok` :-)
Inspired by https://github.com/systemd/systemd/pull/11963, which, in turn,
was prompted by https://github.com/systemd/systemd/pull/11555.
(cherry picked from commit 7ba5ded9dbd7737bc368521f5ea7c90e5b06ab3e)
Related: #2017033
---
.../PotentiallyDangerousFunction.ql | 30 +++++++++++++++++++
.lgtm/cpp-queries/fgets.ql | 21 -------------
2 files changed, 30 insertions(+), 21 deletions(-)
create mode 100644 .lgtm/cpp-queries/PotentiallyDangerousFunction.ql
delete mode 100644 .lgtm/cpp-queries/fgets.ql
diff --git a/.lgtm/cpp-queries/PotentiallyDangerousFunction.ql b/.lgtm/cpp-queries/PotentiallyDangerousFunction.ql
new file mode 100644
index 0000000000..ba80f4ad8c
--- /dev/null
+++ b/.lgtm/cpp-queries/PotentiallyDangerousFunction.ql
@@ -0,0 +1,30 @@
+/**
+ * @name Use of potentially dangerous function
+ * @description Certain standard library functions are dangerous to call.
+ * @kind problem
+ * @problem.severity error
+ * @precision high
+ * @id cpp/potentially-dangerous-function
+ * @tags reliability
+ * security
+ *
+ * Borrowed from
+ * https://github.com/Semmle/ql/blob/master/cpp/ql/src/Security/CWE/CWE-676/PotentiallyDangerousFunction.ql
+ */
+import cpp
+
+predicate potentiallyDangerousFunction(Function f, string message) {
+ (
+ f.getQualifiedName() = "fgets" and
+ message = "Call to fgets is potentially dangerous. Use read_line() instead."
+ ) or (
+ f.getQualifiedName() = "strtok" and
+ message = "Call to strtok is potentially dangerous. Use extract_first_word() instead."
+ )
+}
+
+from FunctionCall call, Function target, string message
+where
+ call.getTarget() = target and
+ potentiallyDangerousFunction(target, message)
+select call, message
diff --git a/.lgtm/cpp-queries/fgets.ql b/.lgtm/cpp-queries/fgets.ql
deleted file mode 100644
index a4181e4f3d..0000000000
--- a/.lgtm/cpp-queries/fgets.ql
+++ /dev/null
@@ -1,21 +0,0 @@
-/**
- * @name Use of fgets()
- * @description fgets() is dangerous to call. Use read_line() instead.
- * @kind problem
- * @problem.severity error
- * @precision high
- * @id cpp/fgets
- * @tags reliability
- * security
- */
-import cpp
-
-predicate dangerousFunction(Function function) {
- exists (string name | name = function.getQualifiedName() |
- name = "fgets")
-}
-
-from FunctionCall call, Function target
-where call.getTarget() = target
- and dangerousFunction(target)
-select call, target.getQualifiedName() + " is potentially dangerous"