diff --git a/clang/test/Analysis/out-of-bounds-false-positive.c b/clang/test/Analysis/out-of-bounds-false-positive.c new file mode 100644 --- /dev/null +++ b/clang/test/Analysis/out-of-bounds-false-positive.c @@ -0,0 +1,101 @@ +// 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}} +}