| 1 | // RUN: %clang_analyze_cc1 -Wno-array-bounds -analyzer-store=region -verify %s \ |
| 2 | // RUN: -analyzer-checker=core \ |
| 3 | // RUN: -analyzer-checker=unix \ |
| 4 | // RUN: -analyzer-checker=alpha.security.ArrayBound \ |
| 5 | // RUN: -analyzer-config unix.DynamicMemoryModeling:Optimistic=true |
| 6 | |
| 7 | typedef __typeof(sizeof(int)) size_t; |
| 8 | void *malloc(size_t); |
| 9 | void *calloc(size_t, size_t); |
| 10 | |
| 11 | char f1() { |
| 12 | char* s = "abcd"; |
| 13 | char c = s[4]; // no-warning |
| 14 | return s[5] + c; // expected-warning{{Access out-of-bound array element (buffer overflow)}} |
| 15 | } |
| 16 | |
| 17 | void f2() { |
| 18 | int *p = malloc(12); |
| 19 | p[3] = 4; // expected-warning{{Access out-of-bound array element (buffer overflow)}} |
| 20 | } |
| 21 | |
| 22 | struct three_words { |
| 23 | int c[3]; |
| 24 | }; |
| 25 | |
| 26 | struct seven_words { |
| 27 | int c[7]; |
| 28 | }; |
| 29 | |
| 30 | void f3() { |
| 31 | struct three_words a, *p; |
| 32 | p = &a; |
| 33 | p[0] = a; // no-warning |
| 34 | p[1] = a; // expected-warning{{Access out-of-bound array element (buffer overflow)}} |
| 35 | } |
| 36 | |
| 37 | void f4() { |
| 38 | struct seven_words c; |
| 39 | struct three_words a, *p = (struct three_words *)&c; |
| 40 | p[0] = a; // no-warning |
| 41 | p[1] = a; // no-warning |
| 42 | p[2] = a; // expected-warning{{Access out-of-bound array element (buffer overflow)}} |
| 43 | } |
| 44 | |
| 45 | void f5() { |
| 46 | char *p = calloc(2,2); |
| 47 | p[3] = '.'; // no-warning |
| 48 | p[4] = '!'; // expected-warning{{out-of-bound}} |
| 49 | } |
| 50 | |
| 51 | void f6() { |
| 52 | char a[2]; |
| 53 | int *b = (int*)a; |
| 54 | b[1] = 3; // expected-warning{{out-of-bound}} |
| 55 | } |
| 56 | |
| 57 | void f7() { |
| 58 | struct three_words a; |
| 59 | a.c[3] = 1; // expected-warning{{out-of-bound}} |
| 60 | } |
| 61 | |
| 62 | void vla(int a) { |
| 63 | if (a == 5) { |
| 64 | int x[a]; |
| 65 | x[4] = 4; // no-warning |
| 66 | x[5] = 5; // expected-warning{{out-of-bound}} |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | void alloca_region(int a) { |
| 71 | if (a == 5) { |
| 72 | char *x = __builtin_alloca(a); |
| 73 | x[4] = 4; // no-warning |
| 74 | x[5] = 5; // expected-warning{{out-of-bound}} |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | int symbolic_index(int a) { |
| 79 | int x[2] = {1, 2}; |
| 80 | if (a == 2) { |
| 81 | return x[a]; // expected-warning{{out-of-bound}} |
| 82 | } |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | int symbolic_index2(int a) { |
| 87 | int x[2] = {1, 2}; |
| 88 | if (a < 0) { |
| 89 | return x[a]; // expected-warning{{out-of-bound}} |
| 90 | } |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | int overflow_binary_search(double in) { |
| 95 | int eee = 16; |
| 96 | if (in < 1e-8 || in > 1e23) { |
| 97 | return 0; |
| 98 | } else { |
| 99 | static const double ins[] = {1e-8, 1e-7, 1e-6, 1e-5, 1e-4, 1e-3, 1e-2, 1e-1, |
| 100 | 1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, |
| 101 | 1e8, 1e9, 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, |
| 102 | 1e16, 1e17, 1e18, 1e19, 1e20, 1e21, 1e22}; |
| 103 | if (in < ins[eee]) { |
| 104 | eee -= 8; |
| 105 | } else { |
| 106 | eee += 8; |
| 107 | } |
| 108 | if (in < ins[eee]) { |
| 109 | eee -= 4; |
| 110 | } else { |
| 111 | eee += 4; |
| 112 | } |
| 113 | if (in < ins[eee]) { |
| 114 | eee -= 2; |
| 115 | } else { |
| 116 | eee += 2; |
| 117 | } |
| 118 | if (in < ins[eee]) { |
| 119 | eee -= 1; |
| 120 | } else { |
| 121 | eee += 1; |
| 122 | } |
| 123 | if (in < ins[eee]) { // expected-warning {{Access out-of-bound array element (buffer overflow)}} |
| 124 | eee -= 1; |
| 125 | } |
| 126 | } |
| 127 | return eee; |
| 128 | } |
| 129 | |