================
@@ -0,0 +1,44 @@
+.. title:: clang-tidy - bugprone-random-generator-seed
+
+bugprone-random-generator-seed
+==============================
+
+Flags all pseudo-random number engines, engine adaptor
+instantiations and ``srand()`` when initialized or seeded with default
argument,
+constant expression or any user-configurable type. Pseudo-random number
+engines seeded with a predictable value may cause vulnerabilities e.g. in
+security protocols.
+
+Examples:
+
+.. code-block:: c++
+
+ void foo() {
+ std::mt19937 engine1; // Diagnose, always generate the same sequence
+ std::mt19937 engine2(1); // Diagnose
+ engine1.seed(); // Diagnose
+ engine2.seed(1); // Diagnose
+
+ std::time_t t;
+ engine1.seed(std::time(&t)); // Diagnose, system time might be controlled
by user
+
+ int x = atoi(argv[1]);
+ std::mt19937 engine3(x); // Will not warn
+ }
+
+Options
+-------
+
+.. option:: DisallowedSeedTypes
+
+ A comma-separated list of the type names which are disallowed.
+ Default value is `time_t,std::time_t`.
+
+References
+----------
+
+This is a CERT security rule, see
----------------
vbvictor wrote:
```suggestion
This check corresponds to the CERT C++ Coding Standard rules
```
https://github.com/llvm/llvm-project/pull/167143
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