improve documentation (#155)

Makefile

@@ -27,7 +27,7 @@ compile_test_files:
 
 codestyle-check:
 	cargo fmt -- --check
-	cargo clippy -- -D clippy::all
+	cargo clippy -- -D clippy::all -D missing_docs
 
 clean:
 	cargo clean

src/caller/src/main.rs

+//! This crate defines the command line interface for the cwe_checker.
+//! General documentation about the cwe_checker is contained in the [`cwe_checker_lib`] crate.
+
+extern crate cwe_checker_lib; // Needed for the docstring-link to work
+
 use cwe_checker_lib::analysis::graph;
 use cwe_checker_lib::utils::binary::RuntimeMemoryImage;
 use cwe_checker_lib::utils::log::print_all_messages;
@@ -22,7 +27,8 @@ struct CmdlineArgs {
     #[structopt(long, short, validator(check_file_existence))]
     config: Option<String>,
 
-    /// Write the results to a file.
+    /// Write the results to a file instead of stdout.
+    /// This only affects CWE warnings. Log messages are still printed to stdout.
     #[structopt(long, short)]
     out: Option<String>,
 
@@ -36,7 +42,7 @@ struct CmdlineArgs {
     #[structopt(long, short)]
     json: bool,
 
-    /// Do not print log messages. This prevents polluting STDOUT for json output.
+    /// Do not print log messages. This prevents polluting stdout for json output.
     #[structopt(long, short)]
     quiet: bool,
 

src/cwe_checker_lib/src/abstract_domain/bitvector.rs

@@ -7,7 +7,9 @@ use crate::prelude::*;
 /// As values it can only assume a known bitvector or *Top(bytesize)*.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub enum BitvectorDomain {
+    /// The `Top` value of the domain, representing the case that nothing is known about the actual value.
     Top(ByteSize),
+    /// The exact value of the bitvector is known.
     Value(Bitvector),
 }
 

src/cwe_checker_lib/src/abstract_domain/data.rs

@@ -10,8 +10,13 @@ use std::fmt::Display;
 /// Both non-pointer values and offsets of pointers are represented by the same abstract domain `T`.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
 pub enum DataDomain<T: RegisterDomain> {
+    /// The `Top` element of the domain.
+    /// Describes a value for which nothing is known.
     Top(ByteSize),
+    /// The value is a pointer to an abstract memory object.
     Pointer(PointerDomain<T>),
+    /// The value is a non-pointer value or a pointer to global memory.
+    /// The latter can happen if pointers to global memory are described by their absolute value.
     Value(T),
 }
 

src/cwe_checker_lib/src/abstract_domain/identifier.rs

@@ -57,7 +57,12 @@ impl std::fmt::Display for AbstractIdentifier {
 /// It is also impossible to accidently describe circular references.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, PartialOrd, Ord)]
 pub enum AbstractLocation {
+    /// The location is given by a register with the given name and byte size.
     Register(String, ByteSize),
+    /// The location is in memory.
+    /// One needs to follow the pointer in the register with the given name (as `String`)
+    /// and then follow the abstract memory location inside the pointed to memory object
+    /// to find the actual memory location.
     Pointer(String, AbstractMemoryLocation),
 }
 
@@ -93,13 +98,20 @@ impl AbstractLocation {
 /// The offset and size variables are given in bytes.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, PartialOrd, Ord)]
 pub enum AbstractMemoryLocation {
+    /// A location inside the current memory object.
     Location {
+        /// The offset with respect to the zero offset of the memory object where the value can be found.
         offset: isize,
+        /// The size in bytes of the value that the memory location points to.
         size: usize,
     },
+    /// A pointer which needs to be followed to get to the actual memory location
     Pointer {
+        /// The offset inside the current memory object where the pointer can be found.
         offset: isize,
+        /// The size in bytes of the pointer.
         size: usize,
+        /// The memory location inside the target of the pointer that this memory location points to.
         target: Box<AbstractMemoryLocation>,
     },
 }

src/cwe_checker_lib/src/abstract_domain/mem_region.rs

@@ -57,7 +57,7 @@ impl<T: AbstractDomain + SizedDomain + HasTop + std::fmt::Debug> HasTop for MemR
 }
 
 impl<T: AbstractDomain + SizedDomain + HasTop + std::fmt::Debug> MemRegion<T> {
-    // Create a new, empty memory region.
+    /// Create a new, empty memory region.
     pub fn new(address_bytesize: ByteSize) -> Self {
         MemRegion(Arc::new(MemRegionData::new(address_bytesize)))
     }

src/cwe_checker_lib/src/abstract_domain/mod.rs

@@ -23,12 +23,14 @@ pub use interval::*;
 
 /// The main trait describing an abstract domain.
 ///
-/// Each abstract domain is partially ordered and has a maximal element (which can be generated by `top()`).
+/// Each abstract domain is partially ordered.
 /// Abstract domains of the same type can be merged.
 pub trait AbstractDomain: Sized + Eq + Clone {
+    /// Return an upper bound (with respect to the partial order on the domain) for the two inputs `self` and `other`.
     fn merge(&self, other: &Self) -> Self;
 
-    /// Returns whether the element represents the top element or not.
+    /// Returns whether the element represents the top element (i.e. maximal with respect to the partial order) or not.
+    /// If a domain has no maximal element, this function should always return false.
     fn is_top(&self) -> bool;
 }
 

src/cwe_checker_lib/src/analysis/backward_interprocedural_fixpoint/mod.rs

@@ -28,6 +28,7 @@ use std::marker::PhantomData;
 /// All edge transition functions can return `None` to indicate that no information flows through the edge.
 /// For example, this can be used to indicate edges that can never been taken.
 pub trait Context<'a> {
+    /// The type of the values that are assigned to nodes during the fixpoint computation.
     type Value: PartialEq + Eq + Clone;
 
     /// Get a reference to the graph that the fixpoint is computed on.
@@ -241,6 +242,7 @@ impl<'a, T: Context<'a>> GeneralizedContext<'a, T> {
         }
     }
 
+    /// Get the inner context object.
     pub fn get_context(&self) -> &T {
         &self.context
     }

src/cwe_checker_lib/src/analysis/forward_interprocedural_fixpoint.rs

@@ -27,6 +27,7 @@ use std::marker::PhantomData;
 /// All edge transition functions can return `None` to indicate that no information flows through the edge.
 /// For example, this can be used to indicate edges that can never been taken.
 pub trait Context<'a> {
+    /// The type of the values that are assigned to nodes during the fixpoint computation.
     type Value: PartialEq + Eq + Clone;
 
     /// Get a reference to the graph that the fixpoint is computed on.
@@ -97,6 +98,7 @@ impl<'a, T: Context<'a>> GeneralizedContext<'a, T> {
         }
     }
 
+    /// Get the inner context object.
     pub fn get_context(&self) -> &T {
         &self.context
     }

src/cwe_checker_lib/src/analysis/graph.rs

@@ -65,14 +65,25 @@ pub type Graph<'a> = DiGraph<Node<'a>, Edge<'a>>;
 /// to allow unambigous node identification.
 #[derive(Serialize, Debug, PartialEq, Eq, Hash, Clone, Copy)]
 pub enum Node<'a> {
+    /// A node corresponding to the start of a basic block,
+    /// i.e. to the point in time just before the execution of the block.
     BlkStart(&'a Term<Blk>, &'a Term<Sub>),
+    /// A node corresponding to the end of the basic block,
+    /// i.e. to the point in time just after the execution of all `Def` instructions in the block
+    /// but before execution of the jump instructions at the end of the block.
     BlkEnd(&'a Term<Blk>, &'a Term<Sub>),
+    /// An artificial node. See the module-level documentation for more information.
     CallReturn {
+        /// The block containing the callsite of the call.
         call: (&'a Term<Blk>, &'a Term<Sub>),
+        /// The block that the called functions returns to.
         return_: (&'a Term<Blk>, &'a Term<Sub>),
     },
+    /// An artificial node. See the module-level documentation for more information.
     CallSource {
+        /// The block containing the callsite of the call
         source: (&'a Term<Blk>, &'a Term<Sub>),
+        /// The block containing the target of the call, i.e. the first block of the target function.
         target: (&'a Term<Blk>, &'a Term<Sub>),
     },
 }
@@ -124,13 +135,29 @@ impl<'a> std::fmt::Display for Node<'a> {
 /// In this case the other jump reference points to the untaken conditional jump.
 #[derive(Serialize, Debug, PartialEq, Eq, Hash, Clone, Copy)]
 pub enum Edge<'a> {
+    /// An edge between the `BlkStart` and `BlkEnd` nodes of a basic block.
     Block,
+    /// An edge corresponding to an intraprocedural jump instruction.
+    /// If the jump is only taken if a previous conditional jump is not taken,
+    /// then a reference to the untaken conditional jump is also added to the jump label.
     Jump(&'a Term<Jmp>, Option<&'a Term<Jmp>>),
+    /// An edge corresponding to a function call instruction.
+    /// Only generated for calls to functions inside the binary.
+    /// See the module-level documentation for more information.
     Call(&'a Term<Jmp>),
+    /// An edge corresponding to a call to a function not contained in the binary,
+    /// i.e. the target is located in a shared object loaded by the binary.
+    /// The edge goes directly from the callsite to the return-to-site inside the caller.
     ExternCallStub(&'a Term<Jmp>),
+    /// An artificial edge. See the module-level documentation for more information.
     CRCallStub,
+    /// An artificial edge. See the module-level documentation for more information.
     CRReturnStub,
+    /// An artificial edge to combine intra- and interprocedural data flows at the callsite of calls.
+    /// See the module-level documentation for more information.
     CallCombine(&'a Term<Jmp>),
+    /// An artificial edge to combine intra- and interprocedural data flows at the return-to site of calls.
+    /// See the module-level documentation for more information.
     ReturnCombine(&'a Term<Jmp>),
 }
 

src/cwe_checker_lib/src/analysis/interprocedural_fixpoint_generic.rs

+//! Types and functions shared between the implementations
+//! of forward and backward interprocedural fixpoint computations.
+
 use crate::prelude::*;
 
 /// NodeValue that can either be a single abstract value or a
-/// composition of the abstract value computed following an interprocedural
-/// call in the graph and of the abstract value when the call is not taken.
-/// The CallFlowCombinator then allows for a merge of the values computed
-/// over both paths.
+/// composition of the abstract value computed following an interprocedural call in the graph
+/// and of the abstract value before or after the call (depending on the direction of the fixpoint analysis).
+/// The CallFlowCombinator then allows for a merge of the values computed over both paths.
 ///
 /// The call_stub value will either be transferred from the callsite to the return site
 /// in a forward analysis or the other way around in a backward analysis.
@@ -14,14 +16,22 @@ use crate::prelude::*;
 /// to the callsite in a backward analysis.
 #[derive(PartialEq, Eq, Serialize, Deserialize)]
 pub enum NodeValue<T: PartialEq + Eq> {
+    /// A single abstract value
     Value(T),
+    /// The value saved at artificial combinator nodes.
     CallFlowCombinator {
+        /// The value flowing through the intraprocedural edge of the corresponding call.
         call_stub: Option<T>,
+        /// The value flowing through the interprocedural edge of the corresponding call,
+        /// i.e. either between callsite and start of the called function
+        /// or between end of the called function and the return-to site of the call.
         interprocedural_flow: Option<T>,
     },
 }
 
 impl<T: PartialEq + Eq> NodeValue<T> {
+    /// Unwraps the contained value for non-combinator nodes.
+    /// Panics if given a combinator value of an artificial node.
     pub fn unwrap_value(&self) -> &T {
         match self {
             NodeValue::Value(value) => value,

src/cwe_checker_lib/src/analysis/mod.rs

+//! Modules necessary for graph-based and fixpoint-based analyses,
+//! as well as analyses depending on these modules.
+
 pub mod backward_interprocedural_fixpoint;
 pub mod fixpoint;
 pub mod forward_interprocedural_fixpoint;

src/cwe_checker_lib/src/analysis/pointer_inference/mod.rs

-//! The pointer inference analysis.
+//! A fixpoint algorithm analyzing all memory accesses in a program.
 //!
 //! The goal of the pointer inference analysis is to keep track of all memory objects and pointers
 //! that the program knows about at specific program points during execution.
@@ -40,6 +40,7 @@ pub use state::State;
 /// The version number of the analysis.
 const VERSION: &str = "0.1";
 
+/// The name and version number of the "Memory" CWE check.
 pub static CWE_MODULE: crate::CweModule = crate::CweModule {
     name: "Memory",
     version: VERSION,
@@ -54,18 +55,19 @@ pub type Data = DataDomain<BitvectorDomain>;
 pub struct Config {
     /// Names of extern functions that are `malloc`-like,
     /// i.e. the unique return value is a pointer to a newly allocated chunk of memory or a NULL pointer.
-    allocation_symbols: Vec<String>,
+    pub allocation_symbols: Vec<String>,
     /// Names of extern functions that are `free`-like,
     /// i.e. the memory chunk that the unique parameter of the function points to gets deallocated.
     /// Note that the analysis currently does not detect mismatching allocation-deallocation pairs,
     /// i.e. it cannot distinguish between memory allocated by `malloc` and memory allocated by `new`.
-    deallocation_symbols: Vec<String>,
+    pub deallocation_symbols: Vec<String>,
 }
 
 /// A wrapper struct for the pointer inference computation object.
 pub struct PointerInference<'a> {
     computation: Computation<GeneralizedContext<'a, Context<'a>>>,
     log_collector: crossbeam_channel::Sender<LogThreadMsg>,
+    /// The log messages and CWE warnings that have been generated during the pointer inference analysis.
     pub collected_logs: (Vec<LogMessage>, Vec<CweWarning>),
 }
 
@@ -166,7 +168,7 @@ impl<'a> PointerInference<'a> {
 
     /// Generate a compacted json representation of the results.
     /// Note that this output cannot be used for serialization/deserialization,
-    /// but is only intended for user output.
+    /// but is only intended for user output and debugging.
     pub fn generate_compact_json(&self) -> serde_json::Value {
         let graph = self.computation.get_graph();
         let mut json_nodes = serde_json::Map::new();
@@ -179,18 +181,26 @@ impl<'a> PointerInference<'a> {
         serde_json::Value::Object(json_nodes)
     }
 
+    /// Print a compacted json representation of the results to stdout.
+    /// Note that this output cannot be used for serialization/deserialization,
+    /// but is only intended for user output and debugging.
     pub fn print_compact_json(&self) {
         println!("{:#}", self.generate_compact_json());
     }
 
+    /// Get the underlying graph of the computation.
     pub fn get_graph(&self) -> &Graph {
         self.computation.get_graph()
     }
 
+    /// Get the context object of the computation.
     pub fn get_context(&self) -> &Context {
         self.computation.get_context().get_context()
     }
 
+    /// Get the value associated to a node in the computed fixpoint
+    /// (or intermediate state of the algorithm if the fixpoint has not been reached yet).
+    /// Returns `None` if no value is associated to the Node.
     pub fn get_node_value(&self, node_id: NodeIndex) -> Option<&NodeValue<State>> {
         self.computation.get_node_value(node_id)
     }

src/cwe_checker_lib/src/analysis/pointer_inference/object.rs

+//! This module contains the definition of the abstract memory object type.
+
 use super::Data;
 use crate::abstract_domain::*;
 use crate::prelude::*;
@@ -287,14 +289,18 @@ fn same_or_none<T: Eq + Clone>(left: &Option<T>, right: &Option<T>) -> Option<T>
 /// An object is either a stack or a heap object.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, Copy, PartialOrd, Ord)]
 pub enum ObjectType {
+    /// A stack object, i.e. the stack frame of a function.
     Stack,
+    /// A memory object located on the heap.
     Heap,
 }
 
 /// An object is either alive or dangling (because the memory was freed or a function return invalidated the stack frame).
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, Copy, PartialOrd, Ord)]
 pub enum ObjectState {
+    /// The object is alive.
     Alive,
+    /// The object is dangling, i.e. the memory has been freed already.
     Dangling,
 }
 

src/cwe_checker_lib/src/checkers.rs

+//! The implemented CWE checks.
+//! See their module descriptions for detailed information about each check.
+//!
+//! Currently the `Memory` check is not contained in this module
+//! but directly incorporated into the [`pointer_inference`](crate::analysis::pointer_inference) module.
+//! See there for detailed information about this check.
+
 pub mod cwe_190;
 pub mod cwe_215;
 pub mod cwe_243;

src/cwe_checker_lib/src/checkers/cwe_190.rs

@@ -34,6 +34,7 @@ use crate::utils::log::{CweWarning, LogMessage};
 use crate::utils::symbol_utils::{get_callsites, get_symbol_map};
 use crate::CweModule;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE190",
     version: "0.1",

src/cwe_checker_lib/src/checkers/cwe_215.rs

@@ -22,6 +22,7 @@ use crate::prelude::*;
 use crate::utils::log::{CweWarning, LogMessage};
 use crate::CweModule;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE215",
     version: "0.2",

src/cwe_checker_lib/src/checkers/cwe_243.rs

@@ -33,6 +33,7 @@ use crate::utils::log::{CweWarning, LogMessage};
 use crate::utils::symbol_utils::find_symbol;
 use crate::CweModule;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE243",
     version: "0.2",

src/cwe_checker_lib/src/checkers/cwe_332.rs

@@ -25,6 +25,7 @@ use crate::utils::log::{CweWarning, LogMessage};
 use crate::utils::symbol_utils::find_symbol;
 use crate::CweModule;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE332",
     version: "0.1",

src/cwe_checker_lib/src/checkers/cwe_367.rs

@@ -31,6 +31,7 @@ use crate::CweModule;
 use petgraph::visit::EdgeRef;
 use std::collections::HashMap;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE367",
     version: "0.1",

src/cwe_checker_lib/src/checkers/cwe_426.rs

@@ -38,6 +38,7 @@ use crate::utils::symbol_utils::{find_symbol, get_calls_to_symbols};
 use crate::CweModule;
 use std::collections::HashMap;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE426",
     version: "0.1",

src/cwe_checker_lib/src/checkers/cwe_467.rs

@@ -29,6 +29,7 @@ use crate::utils::log::{CweWarning, LogMessage};
 use crate::utils::symbol_utils::{get_callsites, get_symbol_map};
 use crate::CweModule;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE467",
     version: "0.2",

src/cwe_checker_lib/src/checkers/cwe_476.rs

@@ -50,12 +50,13 @@ use std::collections::HashMap;
 mod state;
 use state::*;
 
-pub mod taint;
+mod taint;
 pub use taint::*;
 
 mod context;
 use context::*;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE476",
     version: "0.3",

src/cwe_checker_lib/src/checkers/cwe_560.rs

@@ -31,13 +31,16 @@ use crate::utils::log::{CweWarning, LogMessage};
 use crate::utils::symbol_utils::{get_callsites, get_symbol_map};
 use crate::CweModule;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE560",
     version: "0.2",
     run: check_cwe,
 };
 
+/// An upper bound for the value of a presumably correct umask argument.
 pub static UPPER_BOUND_CORRECT_UMASK_ARG_VALUE: u64 = 0o177;
+/// An upper bound for the value of a chmod-style argument.
 pub static UPPER_BOUND_CORRECT_CHMOD_ARG_VALUE: u64 = 0o777;
 
 /// Compute the parameter value of umask out of the basic block right before the umask call.

src/cwe_checker_lib/src/checkers/cwe_676.rs

 /*!
 This module implements a check for CWE-676: Use of Potentially Dangerous Function.
-Potentially dangerous functions like memcpy can lead to security issues like buffer overflows.
 
+Potentially dangerous functions like memcpy can lead to security issues like buffer overflows.
 See <https://cwe.mitre.org/data/definitions/676.html> for a detailed description.
 
 How the check works:
 
   * Calls to dangerous functions are flagged. The list of functions that are considered
-dangerous can be configured in config.json. The default list is taken from
+dangerous can be configured in config.json. The default list is based on
 <https://github.com/01org/safestringlib/wiki/SDL-List-of-Banned-Functions>.
 
 False Positives
@@ -32,6 +32,7 @@ use serde::{Deserialize, Serialize};
 
 const VERSION: &str = "0.1";
 
+/// The module name and version
 pub static CWE_MODULE: crate::CweModule = crate::CweModule {
     name: "CWE676",
     version: VERSION,
@@ -106,6 +107,8 @@ pub fn resolve_symbols<'a>(
         .collect()
 }
 
+/// Iterate through all function calls inside the program and flag calls to those functions
+/// that are marked as unsafe via the configuration file.
 pub fn check_cwe(
     analysis_results: &AnalysisResults,
     cwe_params: &serde_json::Value,

src/cwe_checker_lib/src/checkers/cwe_78.rs

@@ -61,6 +61,7 @@ use state::*;
 mod context;
 use context::*;
 
+/// The module name and version
 pub static CWE_MODULE: CweModule = CweModule {
     name: "CWE78",
     version: "0.1",

src/cwe_checker_lib/src/checkers/cwe_782.rs

@@ -28,6 +28,7 @@ use crate::{
 
 const VERSION: &str = "0.1";
 
+/// The module name and version
 pub static CWE_MODULE: crate::CweModule = crate::CweModule {
     name: "CWE782",
     version: VERSION,
@@ -66,6 +67,7 @@ pub fn generate_cwe_warning(calls: &[(&str, &Tid, &str)]) -> Vec<CweWarning> {
     cwe_warnings
 }
 
+/// Iterate through all calls of the program and flag calls to `ioctl()` as CWE warnings.
 pub fn check_cwe(
     analysis_results: &AnalysisResults,
     _cwe_params: &serde_json::Value,

src/cwe_checker_lib/src/intermediate_representation/bitvector.rs

@@ -9,20 +9,33 @@ pub type Bitvector = apint::ApInt;
 
 /// A trait to extend the bitvector type with useful helper functions
 /// that are not contained in the [`apint`] crate.
-/// See the implementation of the trait on the [`Bitvector`] type for more information.
 pub trait BitvectorExtended: Sized {
+    /// Perform a cast operation on the bitvector.
+    /// Returns an error for non-implemented cast operations (currently all float-related casts).
     fn cast(&self, kind: CastOpType, width: ByteSize) -> Result<Self, Error>;
 
+    /// Extract a subpiece from the given bitvector.
     fn subpiece(&self, low_byte: ByteSize, size: ByteSize) -> Self;
 
+    /// Perform a unary operation on the given bitvector.
+    /// Returns an error for non-implemented operations (currently all float-related operations).
     fn un_op(&self, op: UnOpType) -> Result<Self, Error>;
 
+    /// Perform a binary operation on the given bitvectors.
+    /// Returns an error for non-implemented operations (currently all float-related operations).
     fn bin_op(&self, op: BinOpType, rhs: &Self) -> Result<Self, Error>;
 
+    /// Returns `true` if adding `self` to `rhs` would result in a signed integer overflow or underflow.
     fn signed_add_overflow_check(&self, rhs: &Self) -> bool;
 
+    /// Returns `true` if subtracting `rhs` from `self` would result in a signed integer overflow or underflow.
     fn signed_sub_overflow_check(&self, rhs: &Self) -> bool;
 
+    /// Return the result of multiplying `self` with `rhs`
+    /// and a flag that is set to `true` if the multiplication resulted in a signed integer overflow or underflow.
+    ///
+    /// Returns an error for bitvectors larger than 8 bytes,
+    /// since multiplication for them is not yet implemented in the [`apint`] crate.
     fn signed_mult_with_overflow_flag(&self, rhs: &Self) -> Result<(Self, bool), Error>;
 }
 
@@ -42,7 +55,7 @@ impl BitvectorExtended for Bitvector {
         }
     }
 
-    /// Extract a subpiece of the given bitvector.
+    /// Extract a subpiece from the given bitvector.
     fn subpiece(&self, low_byte: ByteSize, size: ByteSize) -> Self {
         self.clone()
             .into_checked_lshr(low_byte.as_bit_length())

src/cwe_checker_lib/src/intermediate_representation/expression.rs

@@ -32,26 +32,45 @@ pub enum Expression {
     /// Note that most (but not all) operations require the left hand side (`lhs`)
     /// and right hand side (`rhs`) to be of equal size.
     BinOp {
+        /// The opcode/type of the operation
         op: BinOpType,
+        /// The left hand side expression
         lhs: Box<Expression>,
+        /// The right hand side expression
         rhs: Box<Expression>,
     },
     /// A unary operation
-    UnOp { op: UnOpType, arg: Box<Expression> },
+    UnOp {
+        /// The opcode/type of the operation
+        op: UnOpType,
+        /// The argument expression
+        arg: Box<Expression>,
+    },
     /// A cast operation for type cast between integer and floating point types of different byte lengths.
     Cast {
+        /// The opcode/type of the cast operation
         op: CastOpType,
+        /// The byte size of the result value of the expresion
         size: ByteSize,
+        /// The argument of the expression
         arg: Box<Expression>,
     },
     /// An unknown value but with known size.
     /// This may be generated for e.g. unsupported assembly instructions.
     /// Note that computation of an unknown value is still required to be side-effect-free!
-    Unknown { description: String, size: ByteSize },
+    Unknown {
+        /// A description of the operation
+        description: String,
+        /// The byte size of the result of the unknown expression
+        size: ByteSize,
+    },
     /// Extracting a sub-bitvector from the argument expression.
     Subpiece {
+        /// The lowest byte (i.e. least significant byte if interpreted as integer) of the sub-bitvector to extract.
         low_byte: ByteSize,
+        /// The size of the resulting sub-bitvector
         size: ByteSize,
+        /// The argument from which to extract the bitvector from.
         arg: Box<Expression>,
     },
 }
@@ -368,7 +387,9 @@ impl Expression {
     }
 }
 
-/// The type/mnemonic of a binary operation
+/// The type/mnemonic of a binary operation.
+/// See the Ghidra P-Code documentation for more information.
+#[allow(missing_docs)]
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, Copy)]
 pub enum BinOpType {
     Piece,
@@ -408,6 +429,8 @@ pub enum BinOpType {
 }
 
 /// The type/mnemonic of a typecast
+/// See the Ghidra P-Code documentation for more information.
+#[allow(missing_docs)]
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, Copy)]
 pub enum CastOpType {
     IntZExt,
@@ -419,6 +442,8 @@ pub enum CastOpType {
 }
 
 /// The type/mnemonic of an unary operation
+/// See the Ghidra P-Code documentation for more information.
+#[allow(missing_docs)]
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, Copy)]
 pub enum UnOpType {
     IntNegate,

src/cwe_checker_lib/src/intermediate_representation/term.rs

@@ -3,7 +3,7 @@ use crate::prelude::*;
 use crate::utils::log::LogMessage;
 use std::collections::HashSet;
 
-pub mod builder;
+mod builder;
 
 /// A term identifier consisting of an ID string (which is required to be unique)
 /// and an address to indicate where the term is located.
@@ -66,20 +66,30 @@ pub struct Term<T> {
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub enum Def {
     /// A memory load into the register given by `var`.
-    ///
+    Load {
+        /// The target register of the memory load.
         /// The size of `var` also determines the number of bytes read from memory.
+        var: Variable,
+        /// The expression computing the address from which to read from.
         /// The size of `address` is required to match the pointer size of the corresponding CPU architecture.
-    Load { var: Variable, address: Expression },
+        address: Expression,
+    },
     /// A memory store operation.
-    ///
-    /// The size of `value` determines the number of bytes written.
-    /// The size of `address` is required to match the pointer size of the corresponding CPU architecture.
     Store {
+        /// The expression computing the address that is written to.
+        /// The size of `address` is required to match the pointer size of the corresponding CPU architecture.
         address: Expression,
+        /// The expression computing the value that is written to memory.
+        /// The size of `value` also determines the number of bytes written.
         value: Expression,
     },
     /// A register assignment, assigning the result of the expression `value` to the register `var`.
-    Assign { var: Variable, value: Expression },
+    Assign {
+        /// The register that is written to.
+        var: Variable,
+        /// The expression computing the value that is assigned to the register.
+        value: Expression,
+    },
 }
 
 impl Term<Def> {
@@ -119,9 +129,6 @@ impl Term<Def> {
 ///
 /// `Jmp` instructions carry some semantic information with it, like whether a jump is intra- or interprocedural.
 /// Note that this semantic information may not always be correct.
-///
-/// The targets (and return targets) of jumps are, if known, either basic blocks (`Blk`) or subroutines (`Sub`)
-/// depending of the type of the jump.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub enum Jmp {
     /// A direct intraprocedural jump to the targeted `Blk` term identifier.
@@ -129,19 +136,31 @@ pub enum Jmp {
     /// An indirect intraprocedural jump to the address that the given expression evaluates to.
     BranchInd(Expression),
     /// A direct intraprocedural jump that is only taken if the condition evaluates to true (i.e. not zero).
-    CBranch { target: Tid, condition: Expression },
+    CBranch {
+        /// The term ID of the target block of the jump.
+        target: Tid,
+        /// The jump is only taken if this expression evaluates to `true`, (i.e. not zero).
+        condition: Expression,
+    },
     /// A direct interprocedural jump representing a subroutine call.
     ///
     /// Note that this is syntactically equivalent to a `Jmp::Branch`.
-    /// If the `return_` is `None`, then the called function does not return to its caller.
-    Call { target: Tid, return_: Option<Tid> },
+    Call {
+        /// The term ID of the target subroutine (`Sub`) or extern symbol of the call.
+        target: Tid,
+        /// The term ID of the block that the called function returns to.
+        /// May be `None` if it is assumed that the called function never returns.
+        return_: Option<Tid>,
+    },
     /// An indirect interprocedural jump to the address the `target` expression evaluates to
     /// and representing a subroutine call.
     ///
     /// Note that this is syntactically equivalent to a `Jmp::BranchInd`.
-    /// If the `return_` is `None`, then the called function is believed to not return to its caller.
     CallInd {
+        /// An expression computing the target address of the call.
         target: Expression,
+        /// The term ID of the block that the called function returns to.
+        /// May be `None` if it is assumed that the called function never returns.
         return_: Option<Tid>,
     },
     /// A indirect interprocedural jump indicating a return from a subroutine.
@@ -154,11 +173,11 @@ pub enum Jmp {
     /// E.g. syscalls and other interrupts are mapped to `CallOther`.
     /// Assembly instructions that the disassembler does not support are also mapped to `CallOther`.
     /// One can use the `description` field to match for and handle known side effects (e.g. syscalls).
-    ///
-    /// The `return_` field indicates the `Blk` term identifier
-    /// where the disassembler assumes that execution will continue after handling of the side effect.
     CallOther {
+        /// A description of the side effect.
         description: String,
+        /// The block term identifier of the block
+        /// where the disassembler assumes that execution will continue after handling of the side effect.
         return_: Option<Tid>,
     },
 }
@@ -234,8 +253,12 @@ impl Term<Jmp> {
 /// the block structure needs to be updated accordingly.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Blk {
+    /// The `Def` instructions of the basic block in order of execution.
     pub defs: Vec<Term<Def>>,
+    /// The `Jmp` instructions of the basic block
     pub jmps: Vec<Term<Jmp>>,
+    /// If the basic block contains an indirect jump,
+    /// this field contains possible jump target addresses for the jump.
     pub indirect_jmp_targets: Vec<String>,
 }
 
@@ -290,17 +313,24 @@ pub struct Sub {
 /// A parameter or return argument of a function.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub enum Arg {
-    /// The argument is passed in a register
+    /// The argument is passed in the given register
     Register(Variable),
     /// The argument is passed on the stack.
     /// It is positioned at the given offset (in bytes) relative to the stack pointer on function entry
     /// and has the given size.
-    Stack { offset: i64, size: ByteSize },
+    Stack {
+        /// The position of the argument on the stack
+        /// given as offset relative to the stack pointer on function entry.
+        offset: i64,
+        /// The size in bytes of the argument.
+        size: ByteSize,
+    },
 }
 
 /// An extern symbol represents a funtion that is dynamically linked from another binary.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct ExternSymbol {
+    /// The term ID of the extern symbol.
     pub tid: Tid,
     /// Addresses of possibly multiple locations of the same extern symbol
     pub addresses: Vec<String>,

src/cwe_checker_lib/src/intermediate_representation/term/builder.rs

+//! This module contains the implementations of various builder functions
+//! for different terms.
+
 #[cfg(test)]
 use crate::intermediate_representation::{Expression, Variable};
 

src/cwe_checker_lib/src/intermediate_representation/variable.rs

@@ -11,8 +11,11 @@ use crate::prelude::*;
 /// (but never more than one function).
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone)]
 pub struct Variable {
+    /// The name of the variable. Equals the register name if the variable is a physical register.
     pub name: String,
+    /// The size (in bytes) of the variable.
     pub size: ByteSize,
+    /// Set to `false` for physical registers and to `true` for temporary (virtual) variables.
     pub is_temp: bool,
 }
 

src/cwe_checker_lib/src/lib.rs

 /*!
-# cwe_checker_rs
+The main library of the cwe_checker containing all CWE checks and analysis modules.
 
-Parts of the cwe_checker that are written in Rust.
+# What is the cwe_checker
+
+The cwe_checker is a tool for finding common bug classes on binaries using static analysis.
+These bug classes are formally known as [Common Weakness Enumerations](https://cwe.mitre.org/) (CWEs).
+Its main goal is to aid analysts to quickly find vulnerable code paths.
+
+Currently its main focus are ELF binaries that are commonly found on Linux and Unix operating systems.
+The cwe_checker uses [Ghidra](https://ghidra-sre.org/) to disassemble binaries into one common intermediate representation
+and implements its own analyses on this IR.
+Hence, the analyses can be run on all CPU architectures that Ghidra can disassemble,
+which makes the *cwe_checker* a valuable tool for firmware analysis.
+
+# Usage
+
+If the cwe_checker is installed locally, just run
+```sh
+cwe_checker BINARY
+```
+If you want to use the official docker image, you have to mount the input binary into the docker container, e.g.
+```sh
+docker run --rm -v $(pwd)/BINARY:/input fkiecad/cwe_checker /input
+```
+One can modify the behaviour of the cwe_checker through the command line.
+Use the `--help` command line option for more information.
+One can also provide a custom configuration file to modify the behaviour of each check
+through the `--config` command line option.
+Start by taking a look at the standard configuration file located at `src/config.json`
+and read the [check-specific documentation](crate::checkers) for more details about each field in the configuration file.
+
+# Integration into other tools
+
+### Integration into Ghidra
+
+To import the results of the cwe_checker as bookmarks and end-of-line comments into Ghidra,
+one can use the Ghidra script located at `ghidra_plugin/cwe_checker_ghidra_plugin.py`.
+Detailed usage instructions are contained in the file.
+
+### Integration into FACT
+
+[FACT](https://github.com/fkie-cad/FACT_core) already contains a ready-to-use cwe_checker plugin,
+which lets you run the cwe_checker and view its result through the FACT user interface.
+
+# Further documentation
+
+You can find out more information about each check, including known false positives and false negatives,
+by reading the check-specific module documentation in the [`checkers`] module.
 */
 
 use crate::analysis::graph::Graph;
@@ -34,8 +79,12 @@ pub type CweModuleFn =
 /// A structure containing general information about a CWE analysis module,
 /// including the function to be called to run the analysis.
 pub struct CweModule {
+    /// The name of the CWE check.
     pub name: &'static str,
+    /// The version number of the CWE check.
+    /// Should be incremented whenever significant changes are made to the check.
     pub version: &'static str,
+    /// The function that executes the check and returns CWE warnings found during the check.
     pub run: CweModuleFn,
 }
 

src/cwe_checker_lib/src/pcode/expressions.rs

@@ -7,12 +7,19 @@ use crate::intermediate_representation::UnOpType as IrUnOpType;
 use crate::intermediate_representation::Variable as IrVariable;
 use crate::prelude::*;
 
+/// A variable representing a varnode in Ghidra P-Code
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Variable {
+    /// The name of the register if the varnode represents a register
     pub name: Option<String>,
+    /// The value of the varnode if it represents a constant
     pub value: Option<String>,
+    /// If the varnode represents an implicit `LOAD` from memory,
+    /// the (necessarily constant) address of the `LOAD`.
     pub address: Option<String>,
+    /// The size (in bytes) of the varnode
     pub size: ByteSize,
+    /// A flag set to `true` for virtual/temporary registers.
     pub is_virtual: bool,
 }
 
@@ -110,11 +117,21 @@ impl Variable {
     }
 }
 
+/// A P-Code expression.
+///
+/// P-Code itself does not divide instructions into expressions, definitions and jumps,
+/// like in the internally used IR.
+/// This type roughly corresponds to P-Code instructions without side effects
+/// (except for assigning to the output register).
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Expression {
+    /// The instruction mnemonic
     pub mnemonic: ExpressionType,
+    /// The first input varnode (if it exists).
     pub input0: Option<Variable>,
+    /// The second input varnode (if it exists).
     pub input1: Option<Variable>,
+    /// The third input varnode (if it exists).
     pub input2: Option<Variable>,
 }
 
@@ -152,6 +169,8 @@ impl From<Expression> for IrExpression {
     }
 }
 
+/// Expression Opcodes as parsed from Ghidra
+#[allow(missing_docs)]
 #[allow(non_camel_case_types)]
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, Copy)]
 pub enum ExpressionType {
@@ -316,11 +335,16 @@ impl From<ExpressionType> for IrCastOpType {
     }
 }
 
+/// Properties of a register with respect to its base register.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct RegisterProperties {
+    /// The register name.
     pub register: String,
+    /// The name of the base register.
     pub base_register: String,
+    /// The least significant byte of the register when viewed as a sub-register of the base register.
     pub lsb: ByteSize,
+    /// The size (in bytes) of the register
     pub size: ByteSize,
 }
 

src/cwe_checker_lib/src/pcode/mod.rs

+//! Types to describe Ghidra P-Code
+//! and functions to translate it to the internally used intermediate representation.
+//!
+//! The types in this module are not an exact representation of P-Code,
+//! as some preprocessing is already done in the P-Code-Extractor plugin.
+//!
+//! The contents of this module are only used for the initial translation of P-Code into the internally used IR.
+//! For everything else the [`intermediate_representation`](crate::intermediate_representation) should be used directly.
+
 mod expressions;
 pub use expressions::*;
 mod term;

src/cwe_checker_lib/src/pcode/term.rs

@@ -16,23 +16,39 @@ use crate::prelude::*;
 
 // TODO: Handle the case where an indirect tail call is represented by CALLIND plus RETURN
 
+// TODO: Since we do not support BAP anymore, this module should be refactored
+// to remove BAP-specific artifacts like the jump label type.
+
+/// A call instruction.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Call {
+    /// The target label. May be `None` for `CALLOTHER` instructions.
     pub target: Option<Label>,
+    /// The return label if the call is expected to return.
     #[serde(rename = "return")]
     pub return_: Option<Label>,
+    /// A description of the instruction for `CALLOTHER` instructions.
     pub call_string: Option<String>,
 }
 
+/// A jump instruction.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Jmp {
+    /// The mnemonic of the jump.
     pub mnemonic: JmpType,
+    /// The target label for intraprocedural jumps.
     pub goto: Option<Label>,
+    /// The call struct for interprocedural jumps.
     pub call: Option<Call>,
+    /// If the jump is a conditional jump,
+    /// the varnode that has to evaluate to `true` for the jump to be taken.
     pub condition: Option<Variable>,
+    /// A list of potential jump targets for indirect jumps.
     pub target_hints: Option<Vec<String>>,
 }
 
+/// A jump type mnemonic.
+#[allow(missing_docs)]
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, Copy)]
 pub enum JmpType {
     BRANCH,
@@ -111,15 +127,21 @@ impl From<Jmp> for IrJmp {
     }
 }
 
+/// A jump label for distinguishing between direct and indirect jumps.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub enum Label {
+    /// The term identifier of the target of a direct jump.
     Direct(Tid),
+    /// The varnode holding the target address of an indirect jump.
     Indirect(Variable),
 }
 
+/// An assignment instruction, assigning the result of an expression to a varnode.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Def {
+    /// The target varnode whose value gets overwritten.
     pub lhs: Option<Variable>,
+    /// The expression that determines the value to be written.
     pub rhs: Expression,
 }
 
@@ -183,9 +205,12 @@ impl Def {
     }
 }
 
+/// A basic block.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Blk {
+    /// The `Def` instructions of the block in chronological order.
     pub defs: Vec<Term<Def>>,
+    /// The jump instructions at the end of the basic block.
     pub jmps: Vec<Term<Jmp>>,
 }
 
@@ -267,22 +292,33 @@ impl Blk {
     }
 }
 
+/// An argument (parameter or return value) of an extern symbol.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Arg {
+    /// The register containing the argument if it is passed in a register.
     pub var: Option<Variable>,
+    /// The expression computing the location of the argument if it is passed on the stack.
     pub location: Option<Expression>,
+    /// The intent (input or output) of the argument.
     pub intent: ArgIntent,
 }
 
+/// The intent (input or output) of a function argument.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub enum ArgIntent {
+    /// The argument is an input parameter.
     INPUT,
+    /// The argument is a return value.
     OUTPUT,
 }
 
+/// A subfunction.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Sub {
+    /// The name of the function.
     pub name: String,
+    /// The basic blocks of the function.
+    /// The first block of the array is also the entry point into the function.
     pub blocks: Vec<Term<Blk>>,
 }
 
@@ -303,13 +339,21 @@ impl From<Sub> for IrSub {
     }
 }
 
+/// An extern symbol, i.e. a function not contained in the binary but loaded from a shared library.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct ExternSymbol {
+    /// The term identifier of the extern symbol.
     pub tid: Tid,
+    /// The addresses to call the extern symbol.
+    /// May be more than one, since we also identify thunk functions calling the extern symbol with the symbol itself.
     pub addresses: Vec<String>,
+    /// The name of the extern symbol.
     pub name: String,
+    /// The calling convention used (as reported by Ghidra, i.e. this may not be correct).
     pub calling_convention: Option<String>,
+    /// The input and output arguments of the function.
     pub arguments: Vec<Arg>,
+    /// If the function is assumed to never return to the caller, this flag is set to `true`.
     pub no_return: bool,
 }
 
@@ -359,11 +403,19 @@ impl From<ExternSymbol> for IrExternSymbol {
     }
 }
 
+/// The program struct containing all information about the binary
+/// except for CPU-architecture-related information.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Program {
+    /// The subfunctions contained in the binary.
     pub subs: Vec<Term<Sub>>,
+    /// The extern symbols referenced by the binary.
     pub extern_symbols: Vec<ExternSymbol>,
+    /// The term identifiers of entry points into the binary.
     pub entry_points: Vec<Tid>,
+    /// The base address of the memory image of the binary in RAM as reported by Ghidra.
+    ///
+    /// Note that Ghidra may add an offset to the image base address as reported by the binary itself.
     pub image_base: String,
 }
 
@@ -400,13 +452,19 @@ impl Program {
     }
 }
 
+/// A struct describing a calling convention.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct CallingConvention {
+    /// The name of the calling convention.
     #[serde(rename = "calling_convention")]
     pub name: String,
+    /// Possible parameter registers.
     parameter_register: Vec<String>,
+    /// Possible return registers.
     return_register: Vec<String>,
+    /// Callee-saved registers.
     unaffected_register: Vec<String>,
+    /// Registers that may be overwritten by the call, i.e. caller-saved registers.
     killed_by_call_register: Vec<String>,
 }
 
@@ -421,12 +479,18 @@ impl From<CallingConvention> for IrCallingConvention {
     }
 }
 
+/// The project struct describing all known information about the binary.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone)]
 pub struct Project {
+    /// The program struct containing all binary-specific information.
     pub program: Term<Program>,
+    /// The CPU-architecture that the binary uses.
     pub cpu_architecture: String,
+    /// The stack pointer register of the CPU-architecture.
     pub stack_pointer_register: Variable,
+    /// Information about all CPU-architecture-specific registers.
     pub register_properties: Vec<RegisterProperties>,
+    /// Information about known calling conventions for the given CPU architecture.
     pub register_calling_convention: Vec<CallingConvention>,
 }
 

src/cwe_checker_lib/src/utils/graph_utils.rs

+//! Helper functions for common tasks utilizing the control flow graph of the binary.
+
 use crate::analysis::graph::*;
 use crate::intermediate_representation::Jmp;
 use crate::prelude::*;

src/cwe_checker_lib/src/utils/log.rs

+//! Structs and functions for generating log messages and CWE warnings.
+
 use crate::prelude::*;
 use std::thread::JoinHandle;
 
 /// A CWE warning message.
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Hash, Clone, PartialOrd, Ord, Default)]
 pub struct CweWarning {
+    /// A short name of the CWE check, e.g. `CWE190`.
     pub name: String,
+    /// The version number of the check.
     pub version: String,
+    /// Addresses in the binary associated with the CWE warning.
+    /// The first address usually denotes the program point where the CWE warning was generated.
     pub addresses: Vec<String>,
+    /// Term IDs associated to the CWE warning.
+    /// May be more exact than the addresses, e.g. for `Def` terms.
     pub tids: Vec<String>,
+    /// Symbol names (usually of extern symbols) associated to the CWE warning.
     pub symbols: Vec<String>,
+    /// Other useful information. Content depends on the check that generated the CWE warning.
     pub other: Vec<Vec<String>>,
+    /// A short description of the warning that is presented to the user.
+    /// Should contain all essential information necessary to understand the warning,
+    /// including the address in the binary for which the warning was generated.
     pub description: String,
 }
 

src/cwe_checker_lib/src/utils/mod.rs

+//! This module contains various utility modules and helper functions.
+
 pub mod binary;
 pub mod graph_utils;
 pub mod log;

src/cwe_checker_lib/src/utils/symbol_utils.rs

+//! Helper functions for common tasks utilizing extern symbols,
+//! e.g. searching for calls to a specific extern symbol.
+
 use std::collections::HashMap;
 
 use crate::intermediate_representation::*;