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[analyzer][NFC] Add more tests for ArrayBoundCheckerV2 

According to a Bugzilla ticket (https://bugs.llvm.org/show_bug.cgi?id=45148),
ArrayBoundCheckerV2 produces a false-positive report.
This patch adds a test demonstrating the current //flawed// behavior.
Also adds several similar test cases just to be on the safe side.

Reviewed By: martong

Differential Revision: https://reviews.llvm.org/D86870
This commit is contained in:
Balazs Benics 2021-03-10 12:40:52 +01:00
parent 57e149d386
commit 0dc0e2a9ab
1 changed files with 101 additions and 0 deletions
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101
clang/test/Analysis/out-of-bounds-false-positive.c Normal file
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// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.security.ArrayBoundV2,debug.ExprInspection \
// RUN: -analyzer-config eagerly-assume=false -verify %s
void clang_analyzer_eval(int);
void clang_analyzer_printState();
typedef unsigned long long size_t;
const char a[] = "abcd"; // extent: 5 bytes
void symbolic_size_t_and_int0(size_t len) {
// FIXME: Should not warn for this.
(void)a[len + 1]; // expected-warning {{Out of bound memory access}}
// We infered that the 'len' must be in a specific range to make the previous indexing valid.
// len: [0,3]
clang_analyzer_eval(len <= 3); // expected - warning {{TRUE}}
clang_analyzer_eval(len <= 2); // expected - warning {{UNKNOWN}}
}
void symbolic_size_t_and_int1(size_t len) {
(void)a[len]; // no-warning
// len: [0,4]
clang_analyzer_eval(len <= 4); // expected-warning {{TRUE}}
clang_analyzer_eval(len <= 3); // expected-warning {{UNKNOWN}}
}
void symbolic_size_t_and_int2(size_t len) {
(void)a[len - 1]; // no-warning
// len: [1,5]
clang_analyzer_eval(1 <= len && len <= 5); // expected-warning {{TRUE}}
clang_analyzer_eval(2 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 4); // expected-warning {{UNKNOWN}}
}
void symbolic_uint_and_int0(unsigned len) {
(void)a[len + 1]; // no-warning
// len: [0,3]
clang_analyzer_eval(0 <= len && len <= 3); // expected-warning {{TRUE}}
clang_analyzer_eval(1 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 2); // expected-warning {{UNKNOWN}}
}
void symbolic_uint_and_int1(unsigned len) {
(void)a[len]; // no-warning
// len: [0,4]
clang_analyzer_eval(0 <= len && len <= 4); // expected-warning {{TRUE}}
clang_analyzer_eval(1 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 3); // expected-warning {{UNKNOWN}}
}
void symbolic_uint_and_int2(unsigned len) {
(void)a[len - 1]; // no-warning
// len: [1,5]
clang_analyzer_eval(1 <= len && len <= 5); // expected-warning {{TRUE}}
clang_analyzer_eval(2 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 4); // expected-warning {{UNKNOWN}}
}
void symbolic_int_and_int0(int len) {
(void)a[len + 1]; // no-warning
// len: [-1,3]
clang_analyzer_eval(-1 <= len && len <= 3); // expected-warning {{TRUE}}
clang_analyzer_eval(0 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 2); // expected-warning {{UNKNOWN}}
}
void symbolic_int_and_int1(int len) {
(void)a[len]; // no-warning
// len: [0,4]
clang_analyzer_eval(0 <= len && len <= 4); // expected-warning {{TRUE}}
clang_analyzer_eval(1 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 3); // expected-warning {{UNKNOWN}}
}
void symbolic_int_and_int2(int len) {
(void)a[len - 1]; // no-warning
// len: [1,5]
clang_analyzer_eval(1 <= len && len <= 5); // expected-warning {{TRUE}}
clang_analyzer_eval(2 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 4); // expected-warning {{UNKNOWN}}
}
void symbolic_longlong_and_int0(long long len) {
(void)a[len + 1]; // no-warning
// len: [-1,3]
clang_analyzer_eval(-1 <= len && len <= 3); // expected-warning {{TRUE}}
clang_analyzer_eval(0 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 2); // expected-warning {{UNKNOWN}}
}
void symbolic_longlong_and_int1(long long len) {
(void)a[len]; // no-warning
// len: [0,4]
clang_analyzer_eval(0 <= len && len <= 4); // expected-warning {{TRUE}}
clang_analyzer_eval(1 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 3); // expected-warning {{UNKNOWN}}
}
void symbolic_longlong_and_int2(long long len) {
(void)a[len - 1]; // no-warning
// len: [1,5]
clang_analyzer_eval(1 <= len && len <= 5); // expected-warning {{TRUE}}
clang_analyzer_eval(2 <= len); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(len <= 4); // expected-warning {{UNKNOWN}}
}