a3d0c541eb
This adds alpha.core.StoreToImmutable, a new alpha checker that detects writes to immutable memory regions, implementing part of SEI CERT Rule ENV30-C. The original proposal only handled global const variables, but this implementation extends it to also detect writes to: - Local const variables - String literals - Const parameters and struct members - Const arrays and pointers to const data This checker is the continuation of the work started by zukatsinadze. Discussion: https://reviews.llvm.org/D124244
122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
// RUN: %clang_analyze_cc1 -analyzer-checker=alpha.core.StoreToImmutable -verify %s
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// Test basic functionality of StoreToImmutable checker for the C programming language.
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const int tentative_global_const; // expected-note {{Memory region is declared as immutable here}}
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void test_direct_write_to_tentative_const_global() {
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*(int*)&tentative_global_const = 100; // expected-warning {{Trying to write to immutable memory in global read-only storage}}
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}
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const int global_const = 42; // expected-note {{Memory region is declared as immutable here}}
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void test_direct_write_to_const_global() {
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// This should trigger a warning about writing to immutable memory
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*(int*)&global_const = 100; // expected-warning {{Trying to write to immutable memory in global read-only storage}}
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}
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void test_write_through_const_pointer() {
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const int local_const = 10; // expected-note {{Memory region is declared as immutable here}}
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int *ptr = (int*)&local_const;
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*ptr = 20; // expected-warning {{Trying to write to immutable memory}}
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}
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void test_write_to_const_array() {
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const int arr[5] = {1, 2, 3, 4, 5}; // expected-note {{Enclosing memory region is declared as immutable here}}
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int *ptr = (int*)arr;
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ptr[0] = 10; // expected-warning {{Trying to write to immutable memory}}
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}
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struct TestStruct {
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const int x; // expected-note 2 {{Memory region is declared as immutable here}}
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int y;
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};
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void test_write_to_const_struct_member() {
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struct TestStruct s = {1, 2};
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int *ptr = (int*)&s.x;
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*ptr = 10; // expected-warning {{Trying to write to immutable memory}}
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}
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const int global_array[3] = {1, 2, 3}; // expected-note {{Enclosing memory region is declared as immutable here}}
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void test_write_to_const_global_array() {
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int *ptr = (int*)global_array;
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ptr[0] = 10; // expected-warning {{Trying to write to immutable memory in global read-only storage}}
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}
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const struct TestStruct global_struct = {1, 2};
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void test_write_to_const_global_struct() {
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int *ptr = (int*)&global_struct.x;
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*ptr = 10; // expected-warning {{Trying to write to immutable memory in global read-only storage}}
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}
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void test_write_to_const_param(const int param) { // expected-note {{Memory region is declared as immutable here}}
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*(int*)¶m = 100; // expected-warning {{Trying to write to immutable memory}}
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}
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void test_write_to_const_ptr_param(const int *param) {
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*(int*)param = 100; // expected-warning {{Trying to write to immutable memory}}
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}
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void test_write_to_const_array_param(const int arr[5]) {
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*(int*)arr = 100; // expected-warning {{Trying to write to immutable memory}}
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}
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struct ParamStruct {
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const int z; // expected-note 2 {{Memory region is declared as immutable here}}
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int w;
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};
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void test_write_to_const_struct_param(const struct ParamStruct s) {
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*(int*)&s.z = 100; // expected-warning {{Trying to write to immutable memory}}
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}
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void test_write_to_const_struct_ptr_param(const struct ParamStruct *s) {
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*(int*)&s->z = 100; // expected-warning {{Trying to write to immutable memory}}
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}
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void test_write_to_nonconst() {
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int non_const = 42;
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*(int*)&non_const = 100; // No warning expected
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}
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int global_non_const = 42;
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void test_write_to_nonconst_global() {
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*(int*)&global_non_const = 100; // No warning expected
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}
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struct NonConstStruct {
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int x;
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int y;
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};
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void test_write_to_nonconst_struct_member() {
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struct NonConstStruct s = {1, 2};
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*(int*)&s.x = 100; // No warning expected
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}
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void test_write_to_nonconst_param(int param) {
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*(int*)¶m = 100; // No warning expected
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}
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void test_normal_assignment() {
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int x = 42;
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x = 100; // No warning expected
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}
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void test_const_ptr_to_nonconst_data() {
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int data = 42;
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const int *ptr = &data;
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*(int*)ptr = 100; // No warning expected
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}
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void test_const_ptr_to_const_data() {
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const int data = 42; // expected-note {{Memory region is declared as immutable here}}
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const int *ptr = &data;
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*(int*)ptr = 100; // expected-warning {{Trying to write to immutable memory}}
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}
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