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455a35a6 RV |
1 | // SPDX-License-Identifier: GPL-2.0 OR MIT |
2 | /* | |
617f55e2 KC |
3 | * Test cases for arithmetic overflow checks. See: |
4 | * https://www.kernel.org/doc/html/latest/dev-tools/kunit/kunit-tool.html#configuring-building-and-running-tests | |
5 | * ./tools/testing/kunit/kunit.py run overflow [--raw_output] | |
455a35a6 RV |
6 | */ |
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
8 | ||
617f55e2 | 9 | #include <kunit/test.h> |
ca90800a | 10 | #include <linux/device.h> |
455a35a6 | 11 | #include <linux/kernel.h> |
ca90800a | 12 | #include <linux/mm.h> |
455a35a6 RV |
13 | #include <linux/module.h> |
14 | #include <linux/overflow.h> | |
ca90800a | 15 | #include <linux/slab.h> |
455a35a6 | 16 | #include <linux/types.h> |
ca90800a | 17 | #include <linux/vmalloc.h> |
455a35a6 RV |
18 | |
19 | #define DEFINE_TEST_ARRAY(t) \ | |
20 | static const struct test_ ## t { \ | |
21 | t a, b; \ | |
22 | t sum, diff, prod; \ | |
23 | bool s_of, d_of, p_of; \ | |
617f55e2 | 24 | } t ## _tests[] |
455a35a6 RV |
25 | |
26 | DEFINE_TEST_ARRAY(u8) = { | |
27 | {0, 0, 0, 0, 0, false, false, false}, | |
28 | {1, 1, 2, 0, 1, false, false, false}, | |
29 | {0, 1, 1, U8_MAX, 0, false, true, false}, | |
30 | {1, 0, 1, 1, 0, false, false, false}, | |
31 | {0, U8_MAX, U8_MAX, 1, 0, false, true, false}, | |
32 | {U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false}, | |
33 | {1, U8_MAX, 0, 2, U8_MAX, true, true, false}, | |
34 | {U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false}, | |
35 | {U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true}, | |
36 | ||
37 | {U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true}, | |
38 | {U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true}, | |
39 | ||
40 | {1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false}, | |
41 | {1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true}, | |
42 | {1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false}, | |
43 | {1U << 7, 1U << 7, 0, 0, 0, true, false, true}, | |
44 | ||
45 | {48, 32, 80, 16, 0, false, false, true}, | |
46 | {128, 128, 0, 0, 0, true, false, true}, | |
47 | {123, 234, 101, 145, 110, true, true, true}, | |
48 | }; | |
49 | DEFINE_TEST_ARRAY(u16) = { | |
50 | {0, 0, 0, 0, 0, false, false, false}, | |
51 | {1, 1, 2, 0, 1, false, false, false}, | |
52 | {0, 1, 1, U16_MAX, 0, false, true, false}, | |
53 | {1, 0, 1, 1, 0, false, false, false}, | |
54 | {0, U16_MAX, U16_MAX, 1, 0, false, true, false}, | |
55 | {U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false}, | |
56 | {1, U16_MAX, 0, 2, U16_MAX, true, true, false}, | |
57 | {U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false}, | |
58 | {U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true}, | |
59 | ||
60 | {U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true}, | |
61 | {U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true}, | |
62 | ||
63 | {1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false}, | |
64 | {1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true}, | |
65 | {1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false}, | |
66 | {1U << 15, 1U << 15, 0, 0, 0, true, false, true}, | |
67 | ||
68 | {123, 234, 357, 65425, 28782, false, true, false}, | |
69 | {1234, 2345, 3579, 64425, 10146, false, true, true}, | |
70 | }; | |
71 | DEFINE_TEST_ARRAY(u32) = { | |
72 | {0, 0, 0, 0, 0, false, false, false}, | |
73 | {1, 1, 2, 0, 1, false, false, false}, | |
74 | {0, 1, 1, U32_MAX, 0, false, true, false}, | |
75 | {1, 0, 1, 1, 0, false, false, false}, | |
76 | {0, U32_MAX, U32_MAX, 1, 0, false, true, false}, | |
77 | {U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false}, | |
78 | {1, U32_MAX, 0, 2, U32_MAX, true, true, false}, | |
79 | {U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false}, | |
80 | {U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true}, | |
81 | ||
82 | {U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true}, | |
83 | {U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true}, | |
84 | ||
85 | {1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false}, | |
86 | {1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true}, | |
87 | {1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false}, | |
88 | {1U << 31, 1U << 31, 0, 0, 0, true, false, true}, | |
89 | ||
90 | {-2U, 1U, -1U, -3U, -2U, false, false, false}, | |
91 | {-4U, 5U, 1U, -9U, -20U, true, false, true}, | |
92 | }; | |
93 | ||
6a022dd2 | 94 | #if BITS_PER_LONG == 64 |
455a35a6 RV |
95 | DEFINE_TEST_ARRAY(u64) = { |
96 | {0, 0, 0, 0, 0, false, false, false}, | |
97 | {1, 1, 2, 0, 1, false, false, false}, | |
98 | {0, 1, 1, U64_MAX, 0, false, true, false}, | |
99 | {1, 0, 1, 1, 0, false, false, false}, | |
100 | {0, U64_MAX, U64_MAX, 1, 0, false, true, false}, | |
101 | {U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false}, | |
102 | {1, U64_MAX, 0, 2, U64_MAX, true, true, false}, | |
103 | {U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false}, | |
104 | {U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true}, | |
105 | ||
106 | {U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true}, | |
107 | {U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true}, | |
108 | ||
109 | {1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false}, | |
110 | {1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true}, | |
111 | {1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false}, | |
112 | {1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true}, | |
113 | {1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */, | |
114 | 11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL, | |
115 | false, true, false}, | |
116 | {-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true}, | |
117 | }; | |
6a022dd2 | 118 | #endif |
455a35a6 RV |
119 | |
120 | DEFINE_TEST_ARRAY(s8) = { | |
121 | {0, 0, 0, 0, 0, false, false, false}, | |
122 | ||
123 | {0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false}, | |
124 | {S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false}, | |
125 | {0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false}, | |
126 | {S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false}, | |
127 | ||
128 | {-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true}, | |
129 | {S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true}, | |
130 | {-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false}, | |
131 | {S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false}, | |
132 | {-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false}, | |
133 | {-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false}, | |
134 | ||
135 | {1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false}, | |
136 | {S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false}, | |
137 | {1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false}, | |
138 | {S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false}, | |
139 | ||
140 | {S8_MIN, S8_MIN, 0, 0, 0, true, false, true}, | |
141 | {S8_MAX, S8_MAX, -2, 0, 1, true, false, true}, | |
142 | ||
143 | {-4, -32, -36, 28, -128, false, false, true}, | |
144 | {-4, 32, 28, -36, -128, false, false, false}, | |
145 | }; | |
146 | ||
147 | DEFINE_TEST_ARRAY(s16) = { | |
148 | {0, 0, 0, 0, 0, false, false, false}, | |
149 | ||
150 | {0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false}, | |
151 | {S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false}, | |
152 | {0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false}, | |
153 | {S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false}, | |
154 | ||
155 | {-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true}, | |
156 | {S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true}, | |
157 | {-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false}, | |
158 | {S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false}, | |
159 | {-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false}, | |
160 | {-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false}, | |
161 | ||
162 | {1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false}, | |
163 | {S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false}, | |
164 | {1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false}, | |
165 | {S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false}, | |
166 | ||
167 | {S16_MIN, S16_MIN, 0, 0, 0, true, false, true}, | |
168 | {S16_MAX, S16_MAX, -2, 0, 1, true, false, true}, | |
169 | }; | |
170 | DEFINE_TEST_ARRAY(s32) = { | |
171 | {0, 0, 0, 0, 0, false, false, false}, | |
172 | ||
173 | {0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false}, | |
174 | {S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false}, | |
175 | {0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false}, | |
176 | {S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false}, | |
177 | ||
178 | {-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true}, | |
179 | {S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true}, | |
180 | {-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false}, | |
181 | {S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false}, | |
182 | {-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false}, | |
183 | {-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false}, | |
184 | ||
185 | {1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false}, | |
186 | {S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false}, | |
187 | {1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false}, | |
188 | {S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false}, | |
189 | ||
190 | {S32_MIN, S32_MIN, 0, 0, 0, true, false, true}, | |
191 | {S32_MAX, S32_MAX, -2, 0, 1, true, false, true}, | |
192 | }; | |
6a022dd2 KC |
193 | |
194 | #if BITS_PER_LONG == 64 | |
455a35a6 RV |
195 | DEFINE_TEST_ARRAY(s64) = { |
196 | {0, 0, 0, 0, 0, false, false, false}, | |
197 | ||
198 | {0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false}, | |
199 | {S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false}, | |
200 | {0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false}, | |
201 | {S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false}, | |
202 | ||
203 | {-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true}, | |
204 | {S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true}, | |
205 | {-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false}, | |
206 | {S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false}, | |
207 | {-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false}, | |
208 | {-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false}, | |
209 | ||
210 | {1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false}, | |
211 | {S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false}, | |
212 | {1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false}, | |
213 | {S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false}, | |
214 | ||
215 | {S64_MIN, S64_MIN, 0, 0, 0, true, false, true}, | |
216 | {S64_MAX, S64_MAX, -2, 0, 1, true, false, true}, | |
217 | ||
218 | {-1, -1, -2, 0, 1, false, false, false}, | |
219 | {-1, -128, -129, 127, 128, false, false, false}, | |
220 | {-128, -1, -129, -127, 128, false, false, false}, | |
221 | {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false}, | |
222 | }; | |
6a022dd2 | 223 | #endif |
455a35a6 | 224 | |
6d334432 RV |
225 | #define check_one_op(t, fmt, op, sym, a, b, r, of) do { \ |
226 | t _r; \ | |
227 | bool _of; \ | |
228 | \ | |
229 | _of = check_ ## op ## _overflow(a, b, &_r); \ | |
617f55e2 KC |
230 | KUNIT_EXPECT_EQ_MSG(test, _of, of, \ |
231 | "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \ | |
232 | a, b, of ? "" : " not", #t); \ | |
233 | KUNIT_EXPECT_EQ_MSG(test, _r, r, \ | |
234 | "expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \ | |
235 | a, b, r, _r, #t); \ | |
6d334432 RV |
236 | } while (0) |
237 | ||
455a35a6 | 238 | #define DEFINE_TEST_FUNC(t, fmt) \ |
617f55e2 | 239 | static void do_test_ ## t(struct kunit *test, const struct test_ ## t *p) \ |
455a35a6 | 240 | { \ |
6d334432 RV |
241 | check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \ |
242 | check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \ | |
243 | check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \ | |
244 | check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \ | |
245 | check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \ | |
455a35a6 RV |
246 | } \ |
247 | \ | |
617f55e2 | 248 | static void t ## _overflow_test(struct kunit *test) { \ |
455a35a6 RV |
249 | unsigned i; \ |
250 | \ | |
455a35a6 | 251 | for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i) \ |
617f55e2 KC |
252 | do_test_ ## t(test, &t ## _tests[i]); \ |
253 | kunit_info(test, "%zu %s arithmetic tests finished\n", \ | |
8e7c8ca6 | 254 | ARRAY_SIZE(t ## _tests), #t); \ |
455a35a6 RV |
255 | } |
256 | ||
257 | DEFINE_TEST_FUNC(u8, "%d"); | |
258 | DEFINE_TEST_FUNC(s8, "%d"); | |
259 | DEFINE_TEST_FUNC(u16, "%d"); | |
260 | DEFINE_TEST_FUNC(s16, "%d"); | |
261 | DEFINE_TEST_FUNC(u32, "%u"); | |
262 | DEFINE_TEST_FUNC(s32, "%d"); | |
263 | #if BITS_PER_LONG == 64 | |
264 | DEFINE_TEST_FUNC(u64, "%llu"); | |
265 | DEFINE_TEST_FUNC(s64, "%lld"); | |
266 | #endif | |
267 | ||
617f55e2 | 268 | static void overflow_shift_test(struct kunit *test) |
455a35a6 | 269 | { |
8e7c8ca6 | 270 | int count = 0; |
d36b6ad2 KC |
271 | |
272 | /* Args are: value, shift, type, expected result, overflow expected */ | |
617f55e2 | 273 | #define TEST_ONE_SHIFT(a, s, t, expect, of) do { \ |
d36b6ad2 KC |
274 | typeof(a) __a = (a); \ |
275 | typeof(s) __s = (s); \ | |
276 | t __e = (expect); \ | |
277 | t __d; \ | |
278 | bool __of = check_shl_overflow(__a, __s, &__d); \ | |
279 | if (__of != of) { \ | |
617f55e2 KC |
280 | KUNIT_EXPECT_EQ_MSG(test, __of, of, \ |
281 | "expected (%s)(%s << %s) to%s overflow\n", \ | |
d36b6ad2 | 282 | #t, #a, #s, of ? "" : " not"); \ |
d36b6ad2 | 283 | } else if (!__of && __d != __e) { \ |
617f55e2 KC |
284 | KUNIT_EXPECT_EQ_MSG(test, __d, __e, \ |
285 | "expected (%s)(%s << %s) == %s\n", \ | |
d36b6ad2 KC |
286 | #t, #a, #s, #expect); \ |
287 | if ((t)-1 < 0) \ | |
617f55e2 | 288 | kunit_info(test, "got %lld\n", (s64)__d); \ |
d36b6ad2 | 289 | else \ |
617f55e2 | 290 | kunit_info(test, "got %llu\n", (u64)__d); \ |
d36b6ad2 | 291 | } \ |
8e7c8ca6 | 292 | count++; \ |
617f55e2 | 293 | } while (0) |
d36b6ad2 KC |
294 | |
295 | /* Sane shifts. */ | |
617f55e2 KC |
296 | TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false); |
297 | TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false); | |
298 | TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false); | |
299 | TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false); | |
300 | TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false); | |
301 | TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false); | |
302 | TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false); | |
303 | TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false); | |
304 | TEST_ONE_SHIFT(1, 0, int, 1 << 0, false); | |
305 | TEST_ONE_SHIFT(1, 16, int, 1 << 16, false); | |
306 | TEST_ONE_SHIFT(1, 30, int, 1 << 30, false); | |
307 | TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false); | |
308 | TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false); | |
309 | TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false); | |
310 | TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false); | |
311 | TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false); | |
312 | TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false); | |
313 | TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false); | |
314 | TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false); | |
315 | TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false); | |
316 | TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false); | |
317 | TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false); | |
318 | TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false); | |
319 | TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false); | |
320 | TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false); | |
321 | TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false); | |
d36b6ad2 KC |
322 | |
323 | /* Sane shift: start and end with 0, without a too-wide shift. */ | |
617f55e2 KC |
324 | TEST_ONE_SHIFT(0, 7, u8, 0, false); |
325 | TEST_ONE_SHIFT(0, 15, u16, 0, false); | |
326 | TEST_ONE_SHIFT(0, 31, unsigned int, 0, false); | |
327 | TEST_ONE_SHIFT(0, 31, u32, 0, false); | |
328 | TEST_ONE_SHIFT(0, 63, u64, 0, false); | |
d36b6ad2 KC |
329 | |
330 | /* Sane shift: start and end with 0, without reaching signed bit. */ | |
617f55e2 KC |
331 | TEST_ONE_SHIFT(0, 6, s8, 0, false); |
332 | TEST_ONE_SHIFT(0, 14, s16, 0, false); | |
333 | TEST_ONE_SHIFT(0, 30, int, 0, false); | |
334 | TEST_ONE_SHIFT(0, 30, s32, 0, false); | |
335 | TEST_ONE_SHIFT(0, 62, s64, 0, false); | |
d36b6ad2 KC |
336 | |
337 | /* Overflow: shifted the bit off the end. */ | |
617f55e2 KC |
338 | TEST_ONE_SHIFT(1, 8, u8, 0, true); |
339 | TEST_ONE_SHIFT(1, 16, u16, 0, true); | |
340 | TEST_ONE_SHIFT(1, 32, unsigned int, 0, true); | |
341 | TEST_ONE_SHIFT(1, 32, u32, 0, true); | |
342 | TEST_ONE_SHIFT(1, 64, u64, 0, true); | |
d36b6ad2 KC |
343 | |
344 | /* Overflow: shifted into the signed bit. */ | |
617f55e2 KC |
345 | TEST_ONE_SHIFT(1, 7, s8, 0, true); |
346 | TEST_ONE_SHIFT(1, 15, s16, 0, true); | |
347 | TEST_ONE_SHIFT(1, 31, int, 0, true); | |
348 | TEST_ONE_SHIFT(1, 31, s32, 0, true); | |
349 | TEST_ONE_SHIFT(1, 63, s64, 0, true); | |
d36b6ad2 KC |
350 | |
351 | /* Overflow: high bit falls off unsigned types. */ | |
352 | /* 10010110 */ | |
617f55e2 | 353 | TEST_ONE_SHIFT(150, 1, u8, 0, true); |
d36b6ad2 | 354 | /* 1000100010010110 */ |
617f55e2 | 355 | TEST_ONE_SHIFT(34966, 1, u16, 0, true); |
d36b6ad2 | 356 | /* 10000100000010001000100010010110 */ |
617f55e2 KC |
357 | TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true); |
358 | TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true); | |
d36b6ad2 | 359 | /* 1000001000010000010000000100000010000100000010001000100010010110 */ |
617f55e2 | 360 | TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true); |
d36b6ad2 KC |
361 | |
362 | /* Overflow: bit shifted into signed bit on signed types. */ | |
363 | /* 01001011 */ | |
617f55e2 | 364 | TEST_ONE_SHIFT(75, 1, s8, 0, true); |
d36b6ad2 | 365 | /* 0100010001001011 */ |
617f55e2 | 366 | TEST_ONE_SHIFT(17483, 1, s16, 0, true); |
d36b6ad2 | 367 | /* 01000010000001000100010001001011 */ |
617f55e2 KC |
368 | TEST_ONE_SHIFT(1107575883, 1, s32, 0, true); |
369 | TEST_ONE_SHIFT(1107575883, 1, int, 0, true); | |
d36b6ad2 | 370 | /* 0100000100001000001000000010000001000010000001000100010001001011 */ |
617f55e2 | 371 | TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true); |
d36b6ad2 KC |
372 | |
373 | /* Overflow: bit shifted past signed bit on signed types. */ | |
374 | /* 01001011 */ | |
617f55e2 | 375 | TEST_ONE_SHIFT(75, 2, s8, 0, true); |
d36b6ad2 | 376 | /* 0100010001001011 */ |
617f55e2 | 377 | TEST_ONE_SHIFT(17483, 2, s16, 0, true); |
d36b6ad2 | 378 | /* 01000010000001000100010001001011 */ |
617f55e2 KC |
379 | TEST_ONE_SHIFT(1107575883, 2, s32, 0, true); |
380 | TEST_ONE_SHIFT(1107575883, 2, int, 0, true); | |
d36b6ad2 | 381 | /* 0100000100001000001000000010000001000010000001000100010001001011 */ |
617f55e2 | 382 | TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true); |
d36b6ad2 KC |
383 | |
384 | /* Overflow: values larger than destination type. */ | |
617f55e2 KC |
385 | TEST_ONE_SHIFT(0x100, 0, u8, 0, true); |
386 | TEST_ONE_SHIFT(0xFF, 0, s8, 0, true); | |
387 | TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true); | |
388 | TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true); | |
389 | TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true); | |
390 | TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true); | |
391 | TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true); | |
392 | TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true); | |
393 | TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true); | |
d36b6ad2 KC |
394 | |
395 | /* Nonsense: negative initial value. */ | |
617f55e2 KC |
396 | TEST_ONE_SHIFT(-1, 0, s8, 0, true); |
397 | TEST_ONE_SHIFT(-1, 0, u8, 0, true); | |
398 | TEST_ONE_SHIFT(-5, 0, s16, 0, true); | |
399 | TEST_ONE_SHIFT(-5, 0, u16, 0, true); | |
400 | TEST_ONE_SHIFT(-10, 0, int, 0, true); | |
401 | TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true); | |
402 | TEST_ONE_SHIFT(-100, 0, s32, 0, true); | |
403 | TEST_ONE_SHIFT(-100, 0, u32, 0, true); | |
404 | TEST_ONE_SHIFT(-10000, 0, s64, 0, true); | |
405 | TEST_ONE_SHIFT(-10000, 0, u64, 0, true); | |
d36b6ad2 KC |
406 | |
407 | /* Nonsense: negative shift values. */ | |
617f55e2 KC |
408 | TEST_ONE_SHIFT(0, -5, s8, 0, true); |
409 | TEST_ONE_SHIFT(0, -5, u8, 0, true); | |
410 | TEST_ONE_SHIFT(0, -10, s16, 0, true); | |
411 | TEST_ONE_SHIFT(0, -10, u16, 0, true); | |
412 | TEST_ONE_SHIFT(0, -15, int, 0, true); | |
413 | TEST_ONE_SHIFT(0, -15, unsigned int, 0, true); | |
414 | TEST_ONE_SHIFT(0, -20, s32, 0, true); | |
415 | TEST_ONE_SHIFT(0, -20, u32, 0, true); | |
416 | TEST_ONE_SHIFT(0, -30, s64, 0, true); | |
417 | TEST_ONE_SHIFT(0, -30, u64, 0, true); | |
d36b6ad2 KC |
418 | |
419 | /* Overflow: shifted at or beyond entire type's bit width. */ | |
617f55e2 KC |
420 | TEST_ONE_SHIFT(0, 8, u8, 0, true); |
421 | TEST_ONE_SHIFT(0, 9, u8, 0, true); | |
422 | TEST_ONE_SHIFT(0, 8, s8, 0, true); | |
423 | TEST_ONE_SHIFT(0, 9, s8, 0, true); | |
424 | TEST_ONE_SHIFT(0, 16, u16, 0, true); | |
425 | TEST_ONE_SHIFT(0, 17, u16, 0, true); | |
426 | TEST_ONE_SHIFT(0, 16, s16, 0, true); | |
427 | TEST_ONE_SHIFT(0, 17, s16, 0, true); | |
428 | TEST_ONE_SHIFT(0, 32, u32, 0, true); | |
429 | TEST_ONE_SHIFT(0, 33, u32, 0, true); | |
430 | TEST_ONE_SHIFT(0, 32, int, 0, true); | |
431 | TEST_ONE_SHIFT(0, 33, int, 0, true); | |
432 | TEST_ONE_SHIFT(0, 32, s32, 0, true); | |
433 | TEST_ONE_SHIFT(0, 33, s32, 0, true); | |
434 | TEST_ONE_SHIFT(0, 64, u64, 0, true); | |
435 | TEST_ONE_SHIFT(0, 65, u64, 0, true); | |
436 | TEST_ONE_SHIFT(0, 64, s64, 0, true); | |
437 | TEST_ONE_SHIFT(0, 65, s64, 0, true); | |
d36b6ad2 KC |
438 | |
439 | /* | |
440 | * Corner case: for unsigned types, we fail when we've shifted | |
441 | * through the entire width of bits. For signed types, we might | |
442 | * want to match this behavior, but that would mean noticing if | |
443 | * we shift through all but the signed bit, and this is not | |
444 | * currently detected (but we'll notice an overflow into the | |
445 | * signed bit). So, for now, we will test this condition but | |
446 | * mark it as not expected to overflow. | |
447 | */ | |
617f55e2 KC |
448 | TEST_ONE_SHIFT(0, 7, s8, 0, false); |
449 | TEST_ONE_SHIFT(0, 15, s16, 0, false); | |
450 | TEST_ONE_SHIFT(0, 31, int, 0, false); | |
451 | TEST_ONE_SHIFT(0, 31, s32, 0, false); | |
452 | TEST_ONE_SHIFT(0, 63, s64, 0, false); | |
8e7c8ca6 | 453 | |
617f55e2 | 454 | kunit_info(test, "%d shift tests finished\n", count); |
8e7c8ca6 | 455 | #undef TEST_ONE_SHIFT |
d36b6ad2 KC |
456 | } |
457 | ||
ca90800a KC |
458 | /* |
459 | * Deal with the various forms of allocator arguments. See comments above | |
460 | * the DEFINE_TEST_ALLOC() instances for mapping of the "bits". | |
461 | */ | |
8e060c21 KC |
462 | #define alloc_GFP (GFP_KERNEL | __GFP_NOWARN) |
463 | #define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP) | |
464 | #define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE) | |
ca90800a KC |
465 | #define alloc000(alloc, arg, sz) alloc(sz) |
466 | #define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE) | |
8e060c21 | 467 | #define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP) |
ca90800a KC |
468 | #define free0(free, arg, ptr) free(ptr) |
469 | #define free1(free, arg, ptr) free(arg, ptr) | |
470 | ||
8e060c21 KC |
471 | /* Wrap around to 16K */ |
472 | #define TEST_SIZE (5 * 4096) | |
ca90800a KC |
473 | |
474 | #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\ | |
617f55e2 | 475 | static void test_ ## func (struct kunit *test, void *arg) \ |
ca90800a KC |
476 | { \ |
477 | volatile size_t a = TEST_SIZE; \ | |
478 | volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \ | |
479 | void *ptr; \ | |
480 | \ | |
481 | /* Tiny allocation test. */ \ | |
482 | ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\ | |
617f55e2 KC |
483 | KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ |
484 | #func " failed regular allocation?!\n"); \ | |
ca90800a KC |
485 | free ## want_arg (free_func, arg, ptr); \ |
486 | \ | |
487 | /* Wrapped allocation test. */ \ | |
488 | ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ | |
489 | a * b); \ | |
617f55e2 KC |
490 | KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \ |
491 | #func " unexpectedly failed bad wrapping?!\n"); \ | |
ca90800a KC |
492 | free ## want_arg (free_func, arg, ptr); \ |
493 | \ | |
494 | /* Saturated allocation test. */ \ | |
495 | ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \ | |
496 | array_size(a, b)); \ | |
497 | if (ptr) { \ | |
617f55e2 | 498 | KUNIT_FAIL(test, #func " missed saturation!\n"); \ |
ca90800a | 499 | free ## want_arg (free_func, arg, ptr); \ |
ca90800a | 500 | } \ |
ca90800a KC |
501 | } |
502 | ||
503 | /* | |
504 | * Allocator uses a trailing node argument --------+ (e.g. kmalloc_node()) | |
505 | * Allocator uses the gfp_t argument -----------+ | (e.g. kmalloc()) | |
506 | * Allocator uses a special leading argument + | | (e.g. devm_kmalloc()) | |
507 | * | | | | |
508 | */ | |
509 | DEFINE_TEST_ALLOC(kmalloc, kfree, 0, 1, 0); | |
510 | DEFINE_TEST_ALLOC(kmalloc_node, kfree, 0, 1, 1); | |
511 | DEFINE_TEST_ALLOC(kzalloc, kfree, 0, 1, 0); | |
512 | DEFINE_TEST_ALLOC(kzalloc_node, kfree, 0, 1, 1); | |
8e7c8ca6 | 513 | DEFINE_TEST_ALLOC(__vmalloc, vfree, 0, 1, 0); |
ca90800a KC |
514 | DEFINE_TEST_ALLOC(kvmalloc, kvfree, 0, 1, 0); |
515 | DEFINE_TEST_ALLOC(kvmalloc_node, kvfree, 0, 1, 1); | |
516 | DEFINE_TEST_ALLOC(kvzalloc, kvfree, 0, 1, 0); | |
517 | DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1); | |
518 | DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0); | |
519 | DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0); | |
520 | ||
617f55e2 | 521 | static void overflow_allocation_test(struct kunit *test) |
ca90800a KC |
522 | { |
523 | const char device_name[] = "overflow-test"; | |
524 | struct device *dev; | |
8e7c8ca6 | 525 | int count = 0; |
ca90800a | 526 | |
617f55e2 | 527 | #define check_allocation_overflow(alloc) do { \ |
8e7c8ca6 | 528 | count++; \ |
617f55e2 KC |
529 | test_ ## alloc(test, dev); \ |
530 | } while (0) | |
8e7c8ca6 | 531 | |
ca90800a KC |
532 | /* Create dummy device for devm_kmalloc()-family tests. */ |
533 | dev = root_device_register(device_name); | |
617f55e2 KC |
534 | KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev), |
535 | "Cannot register test device\n"); | |
536 | ||
537 | check_allocation_overflow(kmalloc); | |
538 | check_allocation_overflow(kmalloc_node); | |
539 | check_allocation_overflow(kzalloc); | |
540 | check_allocation_overflow(kzalloc_node); | |
541 | check_allocation_overflow(__vmalloc); | |
542 | check_allocation_overflow(kvmalloc); | |
543 | check_allocation_overflow(kvmalloc_node); | |
544 | check_allocation_overflow(kvzalloc); | |
545 | check_allocation_overflow(kvzalloc_node); | |
546 | check_allocation_overflow(devm_kmalloc); | |
547 | check_allocation_overflow(devm_kzalloc); | |
ca90800a KC |
548 | |
549 | device_unregister(dev); | |
550 | ||
617f55e2 | 551 | kunit_info(test, "%d allocation overflow tests finished\n", count); |
8e7c8ca6 | 552 | #undef check_allocation_overflow |
ca90800a KC |
553 | } |
554 | ||
e1be43d9 KC |
555 | struct __test_flex_array { |
556 | unsigned long flags; | |
557 | size_t count; | |
558 | unsigned long data[]; | |
559 | }; | |
560 | ||
617f55e2 | 561 | static void overflow_size_helpers_test(struct kunit *test) |
e1be43d9 | 562 | { |
230f6fa2 KC |
563 | /* Make sure struct_size() can be used in a constant expression. */ |
564 | u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)]; | |
e1be43d9 KC |
565 | struct __test_flex_array *obj; |
566 | int count = 0; | |
e1be43d9 | 567 | int var; |
230f6fa2 KC |
568 | volatile int unconst = 0; |
569 | ||
570 | /* Verify constant expression against runtime version. */ | |
571 | var = 55; | |
572 | OPTIMIZER_HIDE_VAR(var); | |
617f55e2 | 573 | KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var)); |
e1be43d9 | 574 | |
617f55e2 KC |
575 | #define check_one_size_helper(expected, func, args...) do { \ |
576 | size_t _r = func(args); \ | |
577 | KUNIT_EXPECT_EQ_MSG(test, _r, expected, \ | |
578 | "expected " #func "(" #args ") to return %zu but got %zu instead\n", \ | |
579 | (size_t)(expected), _r); \ | |
e1be43d9 | 580 | count++; \ |
617f55e2 | 581 | } while (0) |
e1be43d9 KC |
582 | |
583 | var = 4; | |
617f55e2 KC |
584 | check_one_size_helper(20, size_mul, var++, 5); |
585 | check_one_size_helper(20, size_mul, 4, var++); | |
586 | check_one_size_helper(0, size_mul, 0, 3); | |
587 | check_one_size_helper(0, size_mul, 3, 0); | |
588 | check_one_size_helper(6, size_mul, 2, 3); | |
589 | check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1); | |
590 | check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3); | |
591 | check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3); | |
e1be43d9 KC |
592 | |
593 | var = 4; | |
617f55e2 KC |
594 | check_one_size_helper(9, size_add, var++, 5); |
595 | check_one_size_helper(9, size_add, 4, var++); | |
596 | check_one_size_helper(9, size_add, 9, 0); | |
597 | check_one_size_helper(9, size_add, 0, 9); | |
598 | check_one_size_helper(5, size_add, 2, 3); | |
599 | check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1); | |
600 | check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3); | |
601 | check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3); | |
e1be43d9 KC |
602 | |
603 | var = 4; | |
617f55e2 KC |
604 | check_one_size_helper(1, size_sub, var--, 3); |
605 | check_one_size_helper(1, size_sub, 4, var--); | |
606 | check_one_size_helper(1, size_sub, 3, 2); | |
607 | check_one_size_helper(9, size_sub, 9, 0); | |
608 | check_one_size_helper(SIZE_MAX, size_sub, 9, -3); | |
609 | check_one_size_helper(SIZE_MAX, size_sub, 0, 9); | |
610 | check_one_size_helper(SIZE_MAX, size_sub, 2, 3); | |
611 | check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0); | |
612 | check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10); | |
613 | check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX); | |
614 | check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX); | |
615 | check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1); | |
616 | check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3); | |
617 | check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3); | |
e1be43d9 KC |
618 | |
619 | var = 4; | |
617f55e2 KC |
620 | check_one_size_helper(4 * sizeof(*obj->data), |
621 | flex_array_size, obj, data, var++); | |
622 | check_one_size_helper(5 * sizeof(*obj->data), | |
623 | flex_array_size, obj, data, var++); | |
624 | check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst); | |
625 | check_one_size_helper(sizeof(*obj->data), | |
626 | flex_array_size, obj, data, 1 + unconst); | |
627 | check_one_size_helper(7 * sizeof(*obj->data), | |
628 | flex_array_size, obj, data, 7 + unconst); | |
629 | check_one_size_helper(SIZE_MAX, | |
630 | flex_array_size, obj, data, -1 + unconst); | |
631 | check_one_size_helper(SIZE_MAX, | |
632 | flex_array_size, obj, data, SIZE_MAX - 4 + unconst); | |
e1be43d9 KC |
633 | |
634 | var = 4; | |
617f55e2 KC |
635 | check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)), |
636 | struct_size, obj, data, var++); | |
637 | check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)), | |
638 | struct_size, obj, data, var++); | |
639 | check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst); | |
640 | check_one_size_helper(sizeof(*obj) + sizeof(*obj->data), | |
641 | struct_size, obj, data, 1 + unconst); | |
642 | check_one_size_helper(SIZE_MAX, | |
643 | struct_size, obj, data, -3 + unconst); | |
644 | check_one_size_helper(SIZE_MAX, | |
645 | struct_size, obj, data, SIZE_MAX - 3 + unconst); | |
646 | ||
647 | kunit_info(test, "%d overflow size helper tests finished\n", count); | |
648 | #undef check_one_size_helper | |
e1be43d9 KC |
649 | } |
650 | ||
617f55e2 KC |
651 | static struct kunit_case overflow_test_cases[] = { |
652 | KUNIT_CASE(u8_overflow_test), | |
653 | KUNIT_CASE(s8_overflow_test), | |
654 | KUNIT_CASE(u16_overflow_test), | |
655 | KUNIT_CASE(s16_overflow_test), | |
656 | KUNIT_CASE(u32_overflow_test), | |
657 | KUNIT_CASE(s32_overflow_test), | |
6a022dd2 | 658 | /* Clang 13 and earlier generate unwanted libcalls on 32-bit. */ |
617f55e2 KC |
659 | #if BITS_PER_LONG == 64 |
660 | KUNIT_CASE(u64_overflow_test), | |
661 | KUNIT_CASE(s64_overflow_test), | |
662 | #endif | |
663 | KUNIT_CASE(overflow_shift_test), | |
664 | KUNIT_CASE(overflow_allocation_test), | |
665 | KUNIT_CASE(overflow_size_helpers_test), | |
666 | {} | |
667 | }; | |
455a35a6 | 668 | |
617f55e2 KC |
669 | static struct kunit_suite overflow_test_suite = { |
670 | .name = "overflow", | |
671 | .test_cases = overflow_test_cases, | |
672 | }; | |
455a35a6 | 673 | |
617f55e2 | 674 | kunit_test_suite(overflow_test_suite); |
455a35a6 | 675 | |
455a35a6 | 676 | MODULE_LICENSE("Dual MIT/GPL"); |