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1// SPDX-License-Identifier: GPL-2.0 OR MIT
2/*
3 * Test cases for arithmetic overflow checks. See:
4 * "Running tests with kunit_tool" at Documentation/dev-tools/kunit/start.rst
5 * ./tools/testing/kunit/kunit.py run overflow [--raw_output]
6 */
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <kunit/test.h>
10#include <linux/device.h>
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/module.h>
14#include <linux/overflow.h>
15#include <linux/slab.h>
16#include <linux/types.h>
17#include <linux/vmalloc.h>
18
19#define SKIP(cond, reason) do { \
20 if (cond) { \
21 kunit_skip(test, reason); \
22 return; \
23 } \
24} while (0)
25
26/*
27 * Clang 11 and earlier generate unwanted libcalls for signed output
28 * on unsigned input.
29 */
30#if defined(CONFIG_CC_IS_CLANG) && __clang_major__ <= 11
31# define SKIP_SIGN_MISMATCH(t) SKIP(t, "Clang 11 unwanted libcalls")
32#else
33# define SKIP_SIGN_MISMATCH(t) do { } while (0)
34#endif
35
36/*
37 * Clang 13 and earlier generate unwanted libcalls for 64-bit tests on
38 * 32-bit hosts.
39 */
40#if defined(CONFIG_CC_IS_CLANG) && __clang_major__ <= 13 && \
41 BITS_PER_LONG != 64
42# define SKIP_64_ON_32(t) SKIP(t, "Clang 13 unwanted libcalls")
43#else
44# define SKIP_64_ON_32(t) do { } while (0)
45#endif
46
47#define DEFINE_TEST_ARRAY_TYPED(t1, t2, t) \
48 static const struct test_ ## t1 ## _ ## t2 ## __ ## t { \
49 t1 a; \
50 t2 b; \
51 t sum, diff, prod; \
52 bool s_of, d_of, p_of; \
53 } t1 ## _ ## t2 ## __ ## t ## _tests[]
54
55#define DEFINE_TEST_ARRAY(t) DEFINE_TEST_ARRAY_TYPED(t, t, t)
56
57DEFINE_TEST_ARRAY(u8) = {
58 {0, 0, 0, 0, 0, false, false, false},
59 {1, 1, 2, 0, 1, false, false, false},
60 {0, 1, 1, U8_MAX, 0, false, true, false},
61 {1, 0, 1, 1, 0, false, false, false},
62 {0, U8_MAX, U8_MAX, 1, 0, false, true, false},
63 {U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false},
64 {1, U8_MAX, 0, 2, U8_MAX, true, true, false},
65 {U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false},
66 {U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true},
67
68 {U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true},
69 {U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true},
70
71 {1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false},
72 {1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true},
73 {1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false},
74 {1U << 7, 1U << 7, 0, 0, 0, true, false, true},
75
76 {48, 32, 80, 16, 0, false, false, true},
77 {128, 128, 0, 0, 0, true, false, true},
78 {123, 234, 101, 145, 110, true, true, true},
79};
80DEFINE_TEST_ARRAY(u16) = {
81 {0, 0, 0, 0, 0, false, false, false},
82 {1, 1, 2, 0, 1, false, false, false},
83 {0, 1, 1, U16_MAX, 0, false, true, false},
84 {1, 0, 1, 1, 0, false, false, false},
85 {0, U16_MAX, U16_MAX, 1, 0, false, true, false},
86 {U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false},
87 {1, U16_MAX, 0, 2, U16_MAX, true, true, false},
88 {U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false},
89 {U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true},
90
91 {U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true},
92 {U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true},
93
94 {1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false},
95 {1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true},
96 {1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false},
97 {1U << 15, 1U << 15, 0, 0, 0, true, false, true},
98
99 {123, 234, 357, 65425, 28782, false, true, false},
100 {1234, 2345, 3579, 64425, 10146, false, true, true},
101};
102DEFINE_TEST_ARRAY(u32) = {
103 {0, 0, 0, 0, 0, false, false, false},
104 {1, 1, 2, 0, 1, false, false, false},
105 {0, 1, 1, U32_MAX, 0, false, true, false},
106 {1, 0, 1, 1, 0, false, false, false},
107 {0, U32_MAX, U32_MAX, 1, 0, false, true, false},
108 {U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false},
109 {1, U32_MAX, 0, 2, U32_MAX, true, true, false},
110 {U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false},
111 {U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true},
112
113 {U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true},
114 {U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true},
115
116 {1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false},
117 {1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true},
118 {1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false},
119 {1U << 31, 1U << 31, 0, 0, 0, true, false, true},
120
121 {-2U, 1U, -1U, -3U, -2U, false, false, false},
122 {-4U, 5U, 1U, -9U, -20U, true, false, true},
123};
124
125DEFINE_TEST_ARRAY(u64) = {
126 {0, 0, 0, 0, 0, false, false, false},
127 {1, 1, 2, 0, 1, false, false, false},
128 {0, 1, 1, U64_MAX, 0, false, true, false},
129 {1, 0, 1, 1, 0, false, false, false},
130 {0, U64_MAX, U64_MAX, 1, 0, false, true, false},
131 {U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false},
132 {1, U64_MAX, 0, 2, U64_MAX, true, true, false},
133 {U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false},
134 {U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true},
135
136 {U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true},
137 {U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true},
138
139 {1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false},
140 {1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true},
141 {1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false},
142 {1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true},
143 {1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */,
144 11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL,
145 false, true, false},
146 {-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true},
147};
148
149DEFINE_TEST_ARRAY(s8) = {
150 {0, 0, 0, 0, 0, false, false, false},
151
152 {0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false},
153 {S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false},
154 {0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false},
155 {S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false},
156
157 {-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true},
158 {S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true},
159 {-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false},
160 {S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false},
161 {-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false},
162 {-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false},
163
164 {1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false},
165 {S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false},
166 {1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false},
167 {S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false},
168
169 {S8_MIN, S8_MIN, 0, 0, 0, true, false, true},
170 {S8_MAX, S8_MAX, -2, 0, 1, true, false, true},
171
172 {-4, -32, -36, 28, -128, false, false, true},
173 {-4, 32, 28, -36, -128, false, false, false},
174};
175
176DEFINE_TEST_ARRAY(s16) = {
177 {0, 0, 0, 0, 0, false, false, false},
178
179 {0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false},
180 {S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false},
181 {0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false},
182 {S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false},
183
184 {-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true},
185 {S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true},
186 {-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false},
187 {S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false},
188 {-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false},
189 {-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false},
190
191 {1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false},
192 {S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false},
193 {1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false},
194 {S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false},
195
196 {S16_MIN, S16_MIN, 0, 0, 0, true, false, true},
197 {S16_MAX, S16_MAX, -2, 0, 1, true, false, true},
198};
199DEFINE_TEST_ARRAY(s32) = {
200 {0, 0, 0, 0, 0, false, false, false},
201
202 {0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false},
203 {S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false},
204 {0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false},
205 {S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false},
206
207 {-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true},
208 {S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true},
209 {-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false},
210 {S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false},
211 {-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false},
212 {-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false},
213
214 {1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false},
215 {S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false},
216 {1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false},
217 {S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false},
218
219 {S32_MIN, S32_MIN, 0, 0, 0, true, false, true},
220 {S32_MAX, S32_MAX, -2, 0, 1, true, false, true},
221};
222
223DEFINE_TEST_ARRAY(s64) = {
224 {0, 0, 0, 0, 0, false, false, false},
225
226 {0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false},
227 {S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false},
228 {0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false},
229 {S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false},
230
231 {-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true},
232 {S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true},
233 {-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false},
234 {S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false},
235 {-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false},
236 {-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false},
237
238 {1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false},
239 {S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false},
240 {1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false},
241 {S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false},
242
243 {S64_MIN, S64_MIN, 0, 0, 0, true, false, true},
244 {S64_MAX, S64_MAX, -2, 0, 1, true, false, true},
245
246 {-1, -1, -2, 0, 1, false, false, false},
247 {-1, -128, -129, 127, 128, false, false, false},
248 {-128, -1, -129, -127, 128, false, false, false},
249 {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false},
250};
251
252#define check_one_op(t, fmt, op, sym, a, b, r, of) do { \
253 int _a_orig = a, _a_bump = a + 1; \
254 int _b_orig = b, _b_bump = b + 1; \
255 bool _of; \
256 t _r; \
257 \
258 _of = check_ ## op ## _overflow(a, b, &_r); \
259 KUNIT_EXPECT_EQ_MSG(test, _of, of, \
260 "expected "fmt" "sym" "fmt" to%s overflow (type %s)\n", \
261 a, b, of ? "" : " not", #t); \
262 KUNIT_EXPECT_EQ_MSG(test, _r, r, \
263 "expected "fmt" "sym" "fmt" == "fmt", got "fmt" (type %s)\n", \
264 a, b, r, _r, #t); \
265 /* Check for internal macro side-effects. */ \
266 _of = check_ ## op ## _overflow(_a_orig++, _b_orig++, &_r); \
267 KUNIT_EXPECT_EQ_MSG(test, _a_orig, _a_bump, "Unexpected " #op " macro side-effect!\n"); \
268 KUNIT_EXPECT_EQ_MSG(test, _b_orig, _b_bump, "Unexpected " #op " macro side-effect!\n"); \
269} while (0)
270
271#define DEFINE_TEST_FUNC_TYPED(n, t, fmt) \
272static void do_test_ ## n(struct kunit *test, const struct test_ ## n *p) \
273{ \
274 check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of); \
275 check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of); \
276 check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of); \
277 check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of); \
278 check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of); \
279} \
280 \
281static void n ## _overflow_test(struct kunit *test) { \
282 unsigned i; \
283 \
284 SKIP_64_ON_32(__same_type(t, u64)); \
285 SKIP_64_ON_32(__same_type(t, s64)); \
286 SKIP_SIGN_MISMATCH(__same_type(n ## _tests[0].a, u32) && \
287 __same_type(n ## _tests[0].b, u32) && \
288 __same_type(n ## _tests[0].sum, int)); \
289 \
290 for (i = 0; i < ARRAY_SIZE(n ## _tests); ++i) \
291 do_test_ ## n(test, &n ## _tests[i]); \
292 kunit_info(test, "%zu %s arithmetic tests finished\n", \
293 ARRAY_SIZE(n ## _tests), #n); \
294}
295
296#define DEFINE_TEST_FUNC(t, fmt) \
297 DEFINE_TEST_FUNC_TYPED(t ## _ ## t ## __ ## t, t, fmt)
298
299DEFINE_TEST_FUNC(u8, "%d");
300DEFINE_TEST_FUNC(s8, "%d");
301DEFINE_TEST_FUNC(u16, "%d");
302DEFINE_TEST_FUNC(s16, "%d");
303DEFINE_TEST_FUNC(u32, "%u");
304DEFINE_TEST_FUNC(s32, "%d");
305DEFINE_TEST_FUNC(u64, "%llu");
306DEFINE_TEST_FUNC(s64, "%lld");
307
308DEFINE_TEST_ARRAY_TYPED(u32, u32, u8) = {
309 {0, 0, 0, 0, 0, false, false, false},
310 {U8_MAX, 2, 1, U8_MAX - 2, U8_MAX - 1, true, false, true},
311 {U8_MAX + 1, 0, 0, 0, 0, true, true, false},
312};
313DEFINE_TEST_FUNC_TYPED(u32_u32__u8, u8, "%d");
314
315DEFINE_TEST_ARRAY_TYPED(u32, u32, int) = {
316 {0, 0, 0, 0, 0, false, false, false},
317 {U32_MAX, 0, -1, -1, 0, true, true, false},
318};
319DEFINE_TEST_FUNC_TYPED(u32_u32__int, int, "%d");
320
321DEFINE_TEST_ARRAY_TYPED(u8, u8, int) = {
322 {0, 0, 0, 0, 0, false, false, false},
323 {U8_MAX, U8_MAX, 2 * U8_MAX, 0, U8_MAX * U8_MAX, false, false, false},
324 {1, 2, 3, -1, 2, false, false, false},
325};
326DEFINE_TEST_FUNC_TYPED(u8_u8__int, int, "%d");
327
328DEFINE_TEST_ARRAY_TYPED(int, int, u8) = {
329 {0, 0, 0, 0, 0, false, false, false},
330 {1, 2, 3, U8_MAX, 2, false, true, false},
331 {-1, 0, U8_MAX, U8_MAX, 0, true, true, false},
332};
333DEFINE_TEST_FUNC_TYPED(int_int__u8, u8, "%d");
334
335/* Args are: value, shift, type, expected result, overflow expected */
336#define TEST_ONE_SHIFT(a, s, t, expect, of) do { \
337 typeof(a) __a = (a); \
338 typeof(s) __s = (s); \
339 t __e = (expect); \
340 t __d; \
341 bool __of = check_shl_overflow(__a, __s, &__d); \
342 if (__of != of) { \
343 KUNIT_EXPECT_EQ_MSG(test, __of, of, \
344 "expected (%s)(%s << %s) to%s overflow\n", \
345 #t, #a, #s, of ? "" : " not"); \
346 } else if (!__of && __d != __e) { \
347 KUNIT_EXPECT_EQ_MSG(test, __d, __e, \
348 "expected (%s)(%s << %s) == %s\n", \
349 #t, #a, #s, #expect); \
350 if ((t)-1 < 0) \
351 kunit_info(test, "got %lld\n", (s64)__d); \
352 else \
353 kunit_info(test, "got %llu\n", (u64)__d); \
354 } \
355 count++; \
356} while (0)
357
358static void shift_sane_test(struct kunit *test)
359{
360 int count = 0;
361
362 /* Sane shifts. */
363 TEST_ONE_SHIFT(1, 0, u8, 1 << 0, false);
364 TEST_ONE_SHIFT(1, 4, u8, 1 << 4, false);
365 TEST_ONE_SHIFT(1, 7, u8, 1 << 7, false);
366 TEST_ONE_SHIFT(0xF, 4, u8, 0xF << 4, false);
367 TEST_ONE_SHIFT(1, 0, u16, 1 << 0, false);
368 TEST_ONE_SHIFT(1, 10, u16, 1 << 10, false);
369 TEST_ONE_SHIFT(1, 15, u16, 1 << 15, false);
370 TEST_ONE_SHIFT(0xFF, 8, u16, 0xFF << 8, false);
371 TEST_ONE_SHIFT(1, 0, int, 1 << 0, false);
372 TEST_ONE_SHIFT(1, 16, int, 1 << 16, false);
373 TEST_ONE_SHIFT(1, 30, int, 1 << 30, false);
374 TEST_ONE_SHIFT(1, 0, s32, 1 << 0, false);
375 TEST_ONE_SHIFT(1, 16, s32, 1 << 16, false);
376 TEST_ONE_SHIFT(1, 30, s32, 1 << 30, false);
377 TEST_ONE_SHIFT(1, 0, unsigned int, 1U << 0, false);
378 TEST_ONE_SHIFT(1, 20, unsigned int, 1U << 20, false);
379 TEST_ONE_SHIFT(1, 31, unsigned int, 1U << 31, false);
380 TEST_ONE_SHIFT(0xFFFFU, 16, unsigned int, 0xFFFFU << 16, false);
381 TEST_ONE_SHIFT(1, 0, u32, 1U << 0, false);
382 TEST_ONE_SHIFT(1, 20, u32, 1U << 20, false);
383 TEST_ONE_SHIFT(1, 31, u32, 1U << 31, false);
384 TEST_ONE_SHIFT(0xFFFFU, 16, u32, 0xFFFFU << 16, false);
385 TEST_ONE_SHIFT(1, 0, u64, 1ULL << 0, false);
386 TEST_ONE_SHIFT(1, 40, u64, 1ULL << 40, false);
387 TEST_ONE_SHIFT(1, 63, u64, 1ULL << 63, false);
388 TEST_ONE_SHIFT(0xFFFFFFFFULL, 32, u64, 0xFFFFFFFFULL << 32, false);
389
390 /* Sane shift: start and end with 0, without a too-wide shift. */
391 TEST_ONE_SHIFT(0, 7, u8, 0, false);
392 TEST_ONE_SHIFT(0, 15, u16, 0, false);
393 TEST_ONE_SHIFT(0, 31, unsigned int, 0, false);
394 TEST_ONE_SHIFT(0, 31, u32, 0, false);
395 TEST_ONE_SHIFT(0, 63, u64, 0, false);
396
397 /* Sane shift: start and end with 0, without reaching signed bit. */
398 TEST_ONE_SHIFT(0, 6, s8, 0, false);
399 TEST_ONE_SHIFT(0, 14, s16, 0, false);
400 TEST_ONE_SHIFT(0, 30, int, 0, false);
401 TEST_ONE_SHIFT(0, 30, s32, 0, false);
402 TEST_ONE_SHIFT(0, 62, s64, 0, false);
403
404 kunit_info(test, "%d sane shift tests finished\n", count);
405}
406
407static void shift_overflow_test(struct kunit *test)
408{
409 int count = 0;
410
411 /* Overflow: shifted the bit off the end. */
412 TEST_ONE_SHIFT(1, 8, u8, 0, true);
413 TEST_ONE_SHIFT(1, 16, u16, 0, true);
414 TEST_ONE_SHIFT(1, 32, unsigned int, 0, true);
415 TEST_ONE_SHIFT(1, 32, u32, 0, true);
416 TEST_ONE_SHIFT(1, 64, u64, 0, true);
417
418 /* Overflow: shifted into the signed bit. */
419 TEST_ONE_SHIFT(1, 7, s8, 0, true);
420 TEST_ONE_SHIFT(1, 15, s16, 0, true);
421 TEST_ONE_SHIFT(1, 31, int, 0, true);
422 TEST_ONE_SHIFT(1, 31, s32, 0, true);
423 TEST_ONE_SHIFT(1, 63, s64, 0, true);
424
425 /* Overflow: high bit falls off unsigned types. */
426 /* 10010110 */
427 TEST_ONE_SHIFT(150, 1, u8, 0, true);
428 /* 1000100010010110 */
429 TEST_ONE_SHIFT(34966, 1, u16, 0, true);
430 /* 10000100000010001000100010010110 */
431 TEST_ONE_SHIFT(2215151766U, 1, u32, 0, true);
432 TEST_ONE_SHIFT(2215151766U, 1, unsigned int, 0, true);
433 /* 1000001000010000010000000100000010000100000010001000100010010110 */
434 TEST_ONE_SHIFT(9372061470395238550ULL, 1, u64, 0, true);
435
436 /* Overflow: bit shifted into signed bit on signed types. */
437 /* 01001011 */
438 TEST_ONE_SHIFT(75, 1, s8, 0, true);
439 /* 0100010001001011 */
440 TEST_ONE_SHIFT(17483, 1, s16, 0, true);
441 /* 01000010000001000100010001001011 */
442 TEST_ONE_SHIFT(1107575883, 1, s32, 0, true);
443 TEST_ONE_SHIFT(1107575883, 1, int, 0, true);
444 /* 0100000100001000001000000010000001000010000001000100010001001011 */
445 TEST_ONE_SHIFT(4686030735197619275LL, 1, s64, 0, true);
446
447 /* Overflow: bit shifted past signed bit on signed types. */
448 /* 01001011 */
449 TEST_ONE_SHIFT(75, 2, s8, 0, true);
450 /* 0100010001001011 */
451 TEST_ONE_SHIFT(17483, 2, s16, 0, true);
452 /* 01000010000001000100010001001011 */
453 TEST_ONE_SHIFT(1107575883, 2, s32, 0, true);
454 TEST_ONE_SHIFT(1107575883, 2, int, 0, true);
455 /* 0100000100001000001000000010000001000010000001000100010001001011 */
456 TEST_ONE_SHIFT(4686030735197619275LL, 2, s64, 0, true);
457
458 kunit_info(test, "%d overflow shift tests finished\n", count);
459}
460
461static void shift_truncate_test(struct kunit *test)
462{
463 int count = 0;
464
465 /* Overflow: values larger than destination type. */
466 TEST_ONE_SHIFT(0x100, 0, u8, 0, true);
467 TEST_ONE_SHIFT(0xFF, 0, s8, 0, true);
468 TEST_ONE_SHIFT(0x10000U, 0, u16, 0, true);
469 TEST_ONE_SHIFT(0xFFFFU, 0, s16, 0, true);
470 TEST_ONE_SHIFT(0x100000000ULL, 0, u32, 0, true);
471 TEST_ONE_SHIFT(0x100000000ULL, 0, unsigned int, 0, true);
472 TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, s32, 0, true);
473 TEST_ONE_SHIFT(0xFFFFFFFFUL, 0, int, 0, true);
474 TEST_ONE_SHIFT(0xFFFFFFFFFFFFFFFFULL, 0, s64, 0, true);
475
476 /* Overflow: shifted at or beyond entire type's bit width. */
477 TEST_ONE_SHIFT(0, 8, u8, 0, true);
478 TEST_ONE_SHIFT(0, 9, u8, 0, true);
479 TEST_ONE_SHIFT(0, 8, s8, 0, true);
480 TEST_ONE_SHIFT(0, 9, s8, 0, true);
481 TEST_ONE_SHIFT(0, 16, u16, 0, true);
482 TEST_ONE_SHIFT(0, 17, u16, 0, true);
483 TEST_ONE_SHIFT(0, 16, s16, 0, true);
484 TEST_ONE_SHIFT(0, 17, s16, 0, true);
485 TEST_ONE_SHIFT(0, 32, u32, 0, true);
486 TEST_ONE_SHIFT(0, 33, u32, 0, true);
487 TEST_ONE_SHIFT(0, 32, int, 0, true);
488 TEST_ONE_SHIFT(0, 33, int, 0, true);
489 TEST_ONE_SHIFT(0, 32, s32, 0, true);
490 TEST_ONE_SHIFT(0, 33, s32, 0, true);
491 TEST_ONE_SHIFT(0, 64, u64, 0, true);
492 TEST_ONE_SHIFT(0, 65, u64, 0, true);
493 TEST_ONE_SHIFT(0, 64, s64, 0, true);
494 TEST_ONE_SHIFT(0, 65, s64, 0, true);
495
496 kunit_info(test, "%d truncate shift tests finished\n", count);
497}
498
499static void shift_nonsense_test(struct kunit *test)
500{
501 int count = 0;
502
503 /* Nonsense: negative initial value. */
504 TEST_ONE_SHIFT(-1, 0, s8, 0, true);
505 TEST_ONE_SHIFT(-1, 0, u8, 0, true);
506 TEST_ONE_SHIFT(-5, 0, s16, 0, true);
507 TEST_ONE_SHIFT(-5, 0, u16, 0, true);
508 TEST_ONE_SHIFT(-10, 0, int, 0, true);
509 TEST_ONE_SHIFT(-10, 0, unsigned int, 0, true);
510 TEST_ONE_SHIFT(-100, 0, s32, 0, true);
511 TEST_ONE_SHIFT(-100, 0, u32, 0, true);
512 TEST_ONE_SHIFT(-10000, 0, s64, 0, true);
513 TEST_ONE_SHIFT(-10000, 0, u64, 0, true);
514
515 /* Nonsense: negative shift values. */
516 TEST_ONE_SHIFT(0, -5, s8, 0, true);
517 TEST_ONE_SHIFT(0, -5, u8, 0, true);
518 TEST_ONE_SHIFT(0, -10, s16, 0, true);
519 TEST_ONE_SHIFT(0, -10, u16, 0, true);
520 TEST_ONE_SHIFT(0, -15, int, 0, true);
521 TEST_ONE_SHIFT(0, -15, unsigned int, 0, true);
522 TEST_ONE_SHIFT(0, -20, s32, 0, true);
523 TEST_ONE_SHIFT(0, -20, u32, 0, true);
524 TEST_ONE_SHIFT(0, -30, s64, 0, true);
525 TEST_ONE_SHIFT(0, -30, u64, 0, true);
526
527 /*
528 * Corner case: for unsigned types, we fail when we've shifted
529 * through the entire width of bits. For signed types, we might
530 * want to match this behavior, but that would mean noticing if
531 * we shift through all but the signed bit, and this is not
532 * currently detected (but we'll notice an overflow into the
533 * signed bit). So, for now, we will test this condition but
534 * mark it as not expected to overflow.
535 */
536 TEST_ONE_SHIFT(0, 7, s8, 0, false);
537 TEST_ONE_SHIFT(0, 15, s16, 0, false);
538 TEST_ONE_SHIFT(0, 31, int, 0, false);
539 TEST_ONE_SHIFT(0, 31, s32, 0, false);
540 TEST_ONE_SHIFT(0, 63, s64, 0, false);
541
542 kunit_info(test, "%d nonsense shift tests finished\n", count);
543}
544#undef TEST_ONE_SHIFT
545
546/*
547 * Deal with the various forms of allocator arguments. See comments above
548 * the DEFINE_TEST_ALLOC() instances for mapping of the "bits".
549 */
550#define alloc_GFP (GFP_KERNEL | __GFP_NOWARN)
551#define alloc010(alloc, arg, sz) alloc(sz, alloc_GFP)
552#define alloc011(alloc, arg, sz) alloc(sz, alloc_GFP, NUMA_NO_NODE)
553#define alloc000(alloc, arg, sz) alloc(sz)
554#define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE)
555#define alloc110(alloc, arg, sz) alloc(arg, sz, alloc_GFP)
556#define free0(free, arg, ptr) free(ptr)
557#define free1(free, arg, ptr) free(arg, ptr)
558
559/* Wrap around to 16K */
560#define TEST_SIZE (5 * 4096)
561
562#define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\
563static void test_ ## func (struct kunit *test, void *arg) \
564{ \
565 volatile size_t a = TEST_SIZE; \
566 volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1; \
567 void *ptr; \
568 \
569 /* Tiny allocation test. */ \
570 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\
571 KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
572 #func " failed regular allocation?!\n"); \
573 free ## want_arg (free_func, arg, ptr); \
574 \
575 /* Wrapped allocation test. */ \
576 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
577 a * b); \
578 KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, \
579 #func " unexpectedly failed bad wrapping?!\n"); \
580 free ## want_arg (free_func, arg, ptr); \
581 \
582 /* Saturated allocation test. */ \
583 ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, \
584 array_size(a, b)); \
585 if (ptr) { \
586 KUNIT_FAIL(test, #func " missed saturation!\n"); \
587 free ## want_arg (free_func, arg, ptr); \
588 } \
589}
590
591/*
592 * Allocator uses a trailing node argument --------+ (e.g. kmalloc_node())
593 * Allocator uses the gfp_t argument -----------+ | (e.g. kmalloc())
594 * Allocator uses a special leading argument + | | (e.g. devm_kmalloc())
595 * | | |
596 */
597DEFINE_TEST_ALLOC(kmalloc, kfree, 0, 1, 0);
598DEFINE_TEST_ALLOC(kmalloc_node, kfree, 0, 1, 1);
599DEFINE_TEST_ALLOC(kzalloc, kfree, 0, 1, 0);
600DEFINE_TEST_ALLOC(kzalloc_node, kfree, 0, 1, 1);
601DEFINE_TEST_ALLOC(__vmalloc, vfree, 0, 1, 0);
602DEFINE_TEST_ALLOC(kvmalloc, kvfree, 0, 1, 0);
603DEFINE_TEST_ALLOC(kvmalloc_node, kvfree, 0, 1, 1);
604DEFINE_TEST_ALLOC(kvzalloc, kvfree, 0, 1, 0);
605DEFINE_TEST_ALLOC(kvzalloc_node, kvfree, 0, 1, 1);
606DEFINE_TEST_ALLOC(devm_kmalloc, devm_kfree, 1, 1, 0);
607DEFINE_TEST_ALLOC(devm_kzalloc, devm_kfree, 1, 1, 0);
608
609static void overflow_allocation_test(struct kunit *test)
610{
611 const char device_name[] = "overflow-test";
612 struct device *dev;
613 int count = 0;
614
615#define check_allocation_overflow(alloc) do { \
616 count++; \
617 test_ ## alloc(test, dev); \
618} while (0)
619
620 /* Create dummy device for devm_kmalloc()-family tests. */
621 dev = root_device_register(device_name);
622 KUNIT_ASSERT_FALSE_MSG(test, IS_ERR(dev),
623 "Cannot register test device\n");
624
625 check_allocation_overflow(kmalloc);
626 check_allocation_overflow(kmalloc_node);
627 check_allocation_overflow(kzalloc);
628 check_allocation_overflow(kzalloc_node);
629 check_allocation_overflow(__vmalloc);
630 check_allocation_overflow(kvmalloc);
631 check_allocation_overflow(kvmalloc_node);
632 check_allocation_overflow(kvzalloc);
633 check_allocation_overflow(kvzalloc_node);
634 check_allocation_overflow(devm_kmalloc);
635 check_allocation_overflow(devm_kzalloc);
636
637 device_unregister(dev);
638
639 kunit_info(test, "%d allocation overflow tests finished\n", count);
640#undef check_allocation_overflow
641}
642
643struct __test_flex_array {
644 unsigned long flags;
645 size_t count;
646 unsigned long data[];
647};
648
649static void overflow_size_helpers_test(struct kunit *test)
650{
651 /* Make sure struct_size() can be used in a constant expression. */
652 u8 ce_array[struct_size((struct __test_flex_array *)0, data, 55)];
653 struct __test_flex_array *obj;
654 int count = 0;
655 int var;
656 volatile int unconst = 0;
657
658 /* Verify constant expression against runtime version. */
659 var = 55;
660 OPTIMIZER_HIDE_VAR(var);
661 KUNIT_EXPECT_EQ(test, sizeof(ce_array), struct_size(obj, data, var));
662
663#define check_one_size_helper(expected, func, args...) do { \
664 size_t _r = func(args); \
665 KUNIT_EXPECT_EQ_MSG(test, _r, expected, \
666 "expected " #func "(" #args ") to return %zu but got %zu instead\n", \
667 (size_t)(expected), _r); \
668 count++; \
669} while (0)
670
671 var = 4;
672 check_one_size_helper(20, size_mul, var++, 5);
673 check_one_size_helper(20, size_mul, 4, var++);
674 check_one_size_helper(0, size_mul, 0, 3);
675 check_one_size_helper(0, size_mul, 3, 0);
676 check_one_size_helper(6, size_mul, 2, 3);
677 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 1);
678 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, 3);
679 check_one_size_helper(SIZE_MAX, size_mul, SIZE_MAX, -3);
680
681 var = 4;
682 check_one_size_helper(9, size_add, var++, 5);
683 check_one_size_helper(9, size_add, 4, var++);
684 check_one_size_helper(9, size_add, 9, 0);
685 check_one_size_helper(9, size_add, 0, 9);
686 check_one_size_helper(5, size_add, 2, 3);
687 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 1);
688 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, 3);
689 check_one_size_helper(SIZE_MAX, size_add, SIZE_MAX, -3);
690
691 var = 4;
692 check_one_size_helper(1, size_sub, var--, 3);
693 check_one_size_helper(1, size_sub, 4, var--);
694 check_one_size_helper(1, size_sub, 3, 2);
695 check_one_size_helper(9, size_sub, 9, 0);
696 check_one_size_helper(SIZE_MAX, size_sub, 9, -3);
697 check_one_size_helper(SIZE_MAX, size_sub, 0, 9);
698 check_one_size_helper(SIZE_MAX, size_sub, 2, 3);
699 check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 0);
700 check_one_size_helper(SIZE_MAX, size_sub, SIZE_MAX, 10);
701 check_one_size_helper(SIZE_MAX, size_sub, 0, SIZE_MAX);
702 check_one_size_helper(SIZE_MAX, size_sub, 14, SIZE_MAX);
703 check_one_size_helper(SIZE_MAX - 2, size_sub, SIZE_MAX - 1, 1);
704 check_one_size_helper(SIZE_MAX - 4, size_sub, SIZE_MAX - 1, 3);
705 check_one_size_helper(1, size_sub, SIZE_MAX - 1, -3);
706
707 var = 4;
708 check_one_size_helper(4 * sizeof(*obj->data),
709 flex_array_size, obj, data, var++);
710 check_one_size_helper(5 * sizeof(*obj->data),
711 flex_array_size, obj, data, var++);
712 check_one_size_helper(0, flex_array_size, obj, data, 0 + unconst);
713 check_one_size_helper(sizeof(*obj->data),
714 flex_array_size, obj, data, 1 + unconst);
715 check_one_size_helper(7 * sizeof(*obj->data),
716 flex_array_size, obj, data, 7 + unconst);
717 check_one_size_helper(SIZE_MAX,
718 flex_array_size, obj, data, -1 + unconst);
719 check_one_size_helper(SIZE_MAX,
720 flex_array_size, obj, data, SIZE_MAX - 4 + unconst);
721
722 var = 4;
723 check_one_size_helper(sizeof(*obj) + (4 * sizeof(*obj->data)),
724 struct_size, obj, data, var++);
725 check_one_size_helper(sizeof(*obj) + (5 * sizeof(*obj->data)),
726 struct_size, obj, data, var++);
727 check_one_size_helper(sizeof(*obj), struct_size, obj, data, 0 + unconst);
728 check_one_size_helper(sizeof(*obj) + sizeof(*obj->data),
729 struct_size, obj, data, 1 + unconst);
730 check_one_size_helper(SIZE_MAX,
731 struct_size, obj, data, -3 + unconst);
732 check_one_size_helper(SIZE_MAX,
733 struct_size, obj, data, SIZE_MAX - 3 + unconst);
734
735 kunit_info(test, "%d overflow size helper tests finished\n", count);
736#undef check_one_size_helper
737}
738
739static void overflows_type_test(struct kunit *test)
740{
741 int count = 0;
742 unsigned int var;
743
744#define __TEST_OVERFLOWS_TYPE(func, arg1, arg2, of) do { \
745 bool __of = func(arg1, arg2); \
746 KUNIT_EXPECT_EQ_MSG(test, __of, of, \
747 "expected " #func "(" #arg1 ", " #arg2 " to%s overflow\n",\
748 of ? "" : " not"); \
749 count++; \
750} while (0)
751
752/* Args are: first type, second type, value, overflow expected */
753#define TEST_OVERFLOWS_TYPE(__t1, __t2, v, of) do { \
754 __t1 t1 = (v); \
755 __t2 t2; \
756 __TEST_OVERFLOWS_TYPE(__overflows_type, t1, t2, of); \
757 __TEST_OVERFLOWS_TYPE(__overflows_type, t1, __t2, of); \
758 __TEST_OVERFLOWS_TYPE(__overflows_type_constexpr, t1, t2, of); \
759 __TEST_OVERFLOWS_TYPE(__overflows_type_constexpr, t1, __t2, of);\
760} while (0)
761
762 TEST_OVERFLOWS_TYPE(u8, u8, U8_MAX, false);
763 TEST_OVERFLOWS_TYPE(u8, u16, U8_MAX, false);
764 TEST_OVERFLOWS_TYPE(u8, s8, U8_MAX, true);
765 TEST_OVERFLOWS_TYPE(u8, s8, S8_MAX, false);
766 TEST_OVERFLOWS_TYPE(u8, s8, (u8)S8_MAX + 1, true);
767 TEST_OVERFLOWS_TYPE(u8, s16, U8_MAX, false);
768 TEST_OVERFLOWS_TYPE(s8, u8, S8_MAX, false);
769 TEST_OVERFLOWS_TYPE(s8, u8, -1, true);
770 TEST_OVERFLOWS_TYPE(s8, u8, S8_MIN, true);
771 TEST_OVERFLOWS_TYPE(s8, u16, S8_MAX, false);
772 TEST_OVERFLOWS_TYPE(s8, u16, -1, true);
773 TEST_OVERFLOWS_TYPE(s8, u16, S8_MIN, true);
774 TEST_OVERFLOWS_TYPE(s8, u32, S8_MAX, false);
775 TEST_OVERFLOWS_TYPE(s8, u32, -1, true);
776 TEST_OVERFLOWS_TYPE(s8, u32, S8_MIN, true);
777#if BITS_PER_LONG == 64
778 TEST_OVERFLOWS_TYPE(s8, u64, S8_MAX, false);
779 TEST_OVERFLOWS_TYPE(s8, u64, -1, true);
780 TEST_OVERFLOWS_TYPE(s8, u64, S8_MIN, true);
781#endif
782 TEST_OVERFLOWS_TYPE(s8, s8, S8_MAX, false);
783 TEST_OVERFLOWS_TYPE(s8, s8, S8_MIN, false);
784 TEST_OVERFLOWS_TYPE(s8, s16, S8_MAX, false);
785 TEST_OVERFLOWS_TYPE(s8, s16, S8_MIN, false);
786 TEST_OVERFLOWS_TYPE(u16, u8, U8_MAX, false);
787 TEST_OVERFLOWS_TYPE(u16, u8, (u16)U8_MAX + 1, true);
788 TEST_OVERFLOWS_TYPE(u16, u8, U16_MAX, true);
789 TEST_OVERFLOWS_TYPE(u16, s8, S8_MAX, false);
790 TEST_OVERFLOWS_TYPE(u16, s8, (u16)S8_MAX + 1, true);
791 TEST_OVERFLOWS_TYPE(u16, s8, U16_MAX, true);
792 TEST_OVERFLOWS_TYPE(u16, s16, S16_MAX, false);
793 TEST_OVERFLOWS_TYPE(u16, s16, (u16)S16_MAX + 1, true);
794 TEST_OVERFLOWS_TYPE(u16, s16, U16_MAX, true);
795 TEST_OVERFLOWS_TYPE(u16, u32, U16_MAX, false);
796 TEST_OVERFLOWS_TYPE(u16, s32, U16_MAX, false);
797 TEST_OVERFLOWS_TYPE(s16, u8, U8_MAX, false);
798 TEST_OVERFLOWS_TYPE(s16, u8, (s16)U8_MAX + 1, true);
799 TEST_OVERFLOWS_TYPE(s16, u8, -1, true);
800 TEST_OVERFLOWS_TYPE(s16, u8, S16_MIN, true);
801 TEST_OVERFLOWS_TYPE(s16, u16, S16_MAX, false);
802 TEST_OVERFLOWS_TYPE(s16, u16, -1, true);
803 TEST_OVERFLOWS_TYPE(s16, u16, S16_MIN, true);
804 TEST_OVERFLOWS_TYPE(s16, u32, S16_MAX, false);
805 TEST_OVERFLOWS_TYPE(s16, u32, -1, true);
806 TEST_OVERFLOWS_TYPE(s16, u32, S16_MIN, true);
807#if BITS_PER_LONG == 64
808 TEST_OVERFLOWS_TYPE(s16, u64, S16_MAX, false);
809 TEST_OVERFLOWS_TYPE(s16, u64, -1, true);
810 TEST_OVERFLOWS_TYPE(s16, u64, S16_MIN, true);
811#endif
812 TEST_OVERFLOWS_TYPE(s16, s8, S8_MAX, false);
813 TEST_OVERFLOWS_TYPE(s16, s8, S8_MIN, false);
814 TEST_OVERFLOWS_TYPE(s16, s8, (s16)S8_MAX + 1, true);
815 TEST_OVERFLOWS_TYPE(s16, s8, (s16)S8_MIN - 1, true);
816 TEST_OVERFLOWS_TYPE(s16, s8, S16_MAX, true);
817 TEST_OVERFLOWS_TYPE(s16, s8, S16_MIN, true);
818 TEST_OVERFLOWS_TYPE(s16, s16, S16_MAX, false);
819 TEST_OVERFLOWS_TYPE(s16, s16, S16_MIN, false);
820 TEST_OVERFLOWS_TYPE(s16, s32, S16_MAX, false);
821 TEST_OVERFLOWS_TYPE(s16, s32, S16_MIN, false);
822 TEST_OVERFLOWS_TYPE(u32, u8, U8_MAX, false);
823 TEST_OVERFLOWS_TYPE(u32, u8, (u32)U8_MAX + 1, true);
824 TEST_OVERFLOWS_TYPE(u32, u8, U32_MAX, true);
825 TEST_OVERFLOWS_TYPE(u32, s8, S8_MAX, false);
826 TEST_OVERFLOWS_TYPE(u32, s8, (u32)S8_MAX + 1, true);
827 TEST_OVERFLOWS_TYPE(u32, s8, U32_MAX, true);
828 TEST_OVERFLOWS_TYPE(u32, u16, U16_MAX, false);
829 TEST_OVERFLOWS_TYPE(u32, u16, U16_MAX + 1, true);
830 TEST_OVERFLOWS_TYPE(u32, u16, U32_MAX, true);
831 TEST_OVERFLOWS_TYPE(u32, s16, S16_MAX, false);
832 TEST_OVERFLOWS_TYPE(u32, s16, (u32)S16_MAX + 1, true);
833 TEST_OVERFLOWS_TYPE(u32, s16, U32_MAX, true);
834 TEST_OVERFLOWS_TYPE(u32, u32, U32_MAX, false);
835 TEST_OVERFLOWS_TYPE(u32, s32, S32_MAX, false);
836 TEST_OVERFLOWS_TYPE(u32, s32, U32_MAX, true);
837 TEST_OVERFLOWS_TYPE(u32, s32, (u32)S32_MAX + 1, true);
838#if BITS_PER_LONG == 64
839 TEST_OVERFLOWS_TYPE(u32, u64, U32_MAX, false);
840 TEST_OVERFLOWS_TYPE(u32, s64, U32_MAX, false);
841#endif
842 TEST_OVERFLOWS_TYPE(s32, u8, U8_MAX, false);
843 TEST_OVERFLOWS_TYPE(s32, u8, (s32)U8_MAX + 1, true);
844 TEST_OVERFLOWS_TYPE(s32, u16, S32_MAX, true);
845 TEST_OVERFLOWS_TYPE(s32, u8, -1, true);
846 TEST_OVERFLOWS_TYPE(s32, u8, S32_MIN, true);
847 TEST_OVERFLOWS_TYPE(s32, u16, U16_MAX, false);
848 TEST_OVERFLOWS_TYPE(s32, u16, (s32)U16_MAX + 1, true);
849 TEST_OVERFLOWS_TYPE(s32, u16, S32_MAX, true);
850 TEST_OVERFLOWS_TYPE(s32, u16, -1, true);
851 TEST_OVERFLOWS_TYPE(s32, u16, S32_MIN, true);
852 TEST_OVERFLOWS_TYPE(s32, u32, S32_MAX, false);
853 TEST_OVERFLOWS_TYPE(s32, u32, -1, true);
854 TEST_OVERFLOWS_TYPE(s32, u32, S32_MIN, true);
855#if BITS_PER_LONG == 64
856 TEST_OVERFLOWS_TYPE(s32, u64, S32_MAX, false);
857 TEST_OVERFLOWS_TYPE(s32, u64, -1, true);
858 TEST_OVERFLOWS_TYPE(s32, u64, S32_MIN, true);
859#endif
860 TEST_OVERFLOWS_TYPE(s32, s8, S8_MAX, false);
861 TEST_OVERFLOWS_TYPE(s32, s8, S8_MIN, false);
862 TEST_OVERFLOWS_TYPE(s32, s8, (s32)S8_MAX + 1, true);
863 TEST_OVERFLOWS_TYPE(s32, s8, (s32)S8_MIN - 1, true);
864 TEST_OVERFLOWS_TYPE(s32, s8, S32_MAX, true);
865 TEST_OVERFLOWS_TYPE(s32, s8, S32_MIN, true);
866 TEST_OVERFLOWS_TYPE(s32, s16, S16_MAX, false);
867 TEST_OVERFLOWS_TYPE(s32, s16, S16_MIN, false);
868 TEST_OVERFLOWS_TYPE(s32, s16, (s32)S16_MAX + 1, true);
869 TEST_OVERFLOWS_TYPE(s32, s16, (s32)S16_MIN - 1, true);
870 TEST_OVERFLOWS_TYPE(s32, s16, S32_MAX, true);
871 TEST_OVERFLOWS_TYPE(s32, s16, S32_MIN, true);
872 TEST_OVERFLOWS_TYPE(s32, s32, S32_MAX, false);
873 TEST_OVERFLOWS_TYPE(s32, s32, S32_MIN, false);
874#if BITS_PER_LONG == 64
875 TEST_OVERFLOWS_TYPE(s32, s64, S32_MAX, false);
876 TEST_OVERFLOWS_TYPE(s32, s64, S32_MIN, false);
877 TEST_OVERFLOWS_TYPE(u64, u8, U64_MAX, true);
878 TEST_OVERFLOWS_TYPE(u64, u8, U8_MAX, false);
879 TEST_OVERFLOWS_TYPE(u64, u8, (u64)U8_MAX + 1, true);
880 TEST_OVERFLOWS_TYPE(u64, u16, U64_MAX, true);
881 TEST_OVERFLOWS_TYPE(u64, u16, U16_MAX, false);
882 TEST_OVERFLOWS_TYPE(u64, u16, (u64)U16_MAX + 1, true);
883 TEST_OVERFLOWS_TYPE(u64, u32, U64_MAX, true);
884 TEST_OVERFLOWS_TYPE(u64, u32, U32_MAX, false);
885 TEST_OVERFLOWS_TYPE(u64, u32, (u64)U32_MAX + 1, true);
886 TEST_OVERFLOWS_TYPE(u64, u64, U64_MAX, false);
887 TEST_OVERFLOWS_TYPE(u64, s8, S8_MAX, false);
888 TEST_OVERFLOWS_TYPE(u64, s8, (u64)S8_MAX + 1, true);
889 TEST_OVERFLOWS_TYPE(u64, s8, U64_MAX, true);
890 TEST_OVERFLOWS_TYPE(u64, s16, S16_MAX, false);
891 TEST_OVERFLOWS_TYPE(u64, s16, (u64)S16_MAX + 1, true);
892 TEST_OVERFLOWS_TYPE(u64, s16, U64_MAX, true);
893 TEST_OVERFLOWS_TYPE(u64, s32, S32_MAX, false);
894 TEST_OVERFLOWS_TYPE(u64, s32, (u64)S32_MAX + 1, true);
895 TEST_OVERFLOWS_TYPE(u64, s32, U64_MAX, true);
896 TEST_OVERFLOWS_TYPE(u64, s64, S64_MAX, false);
897 TEST_OVERFLOWS_TYPE(u64, s64, U64_MAX, true);
898 TEST_OVERFLOWS_TYPE(u64, s64, (u64)S64_MAX + 1, true);
899 TEST_OVERFLOWS_TYPE(s64, u8, S64_MAX, true);
900 TEST_OVERFLOWS_TYPE(s64, u8, S64_MIN, true);
901 TEST_OVERFLOWS_TYPE(s64, u8, -1, true);
902 TEST_OVERFLOWS_TYPE(s64, u8, U8_MAX, false);
903 TEST_OVERFLOWS_TYPE(s64, u8, (s64)U8_MAX + 1, true);
904 TEST_OVERFLOWS_TYPE(s64, u16, S64_MAX, true);
905 TEST_OVERFLOWS_TYPE(s64, u16, S64_MIN, true);
906 TEST_OVERFLOWS_TYPE(s64, u16, -1, true);
907 TEST_OVERFLOWS_TYPE(s64, u16, U16_MAX, false);
908 TEST_OVERFLOWS_TYPE(s64, u16, (s64)U16_MAX + 1, true);
909 TEST_OVERFLOWS_TYPE(s64, u32, S64_MAX, true);
910 TEST_OVERFLOWS_TYPE(s64, u32, S64_MIN, true);
911 TEST_OVERFLOWS_TYPE(s64, u32, -1, true);
912 TEST_OVERFLOWS_TYPE(s64, u32, U32_MAX, false);
913 TEST_OVERFLOWS_TYPE(s64, u32, (s64)U32_MAX + 1, true);
914 TEST_OVERFLOWS_TYPE(s64, u64, S64_MAX, false);
915 TEST_OVERFLOWS_TYPE(s64, u64, S64_MIN, true);
916 TEST_OVERFLOWS_TYPE(s64, u64, -1, true);
917 TEST_OVERFLOWS_TYPE(s64, s8, S8_MAX, false);
918 TEST_OVERFLOWS_TYPE(s64, s8, S8_MIN, false);
919 TEST_OVERFLOWS_TYPE(s64, s8, (s64)S8_MAX + 1, true);
920 TEST_OVERFLOWS_TYPE(s64, s8, (s64)S8_MIN - 1, true);
921 TEST_OVERFLOWS_TYPE(s64, s8, S64_MAX, true);
922 TEST_OVERFLOWS_TYPE(s64, s16, S16_MAX, false);
923 TEST_OVERFLOWS_TYPE(s64, s16, S16_MIN, false);
924 TEST_OVERFLOWS_TYPE(s64, s16, (s64)S16_MAX + 1, true);
925 TEST_OVERFLOWS_TYPE(s64, s16, (s64)S16_MIN - 1, true);
926 TEST_OVERFLOWS_TYPE(s64, s16, S64_MAX, true);
927 TEST_OVERFLOWS_TYPE(s64, s32, S32_MAX, false);
928 TEST_OVERFLOWS_TYPE(s64, s32, S32_MIN, false);
929 TEST_OVERFLOWS_TYPE(s64, s32, (s64)S32_MAX + 1, true);
930 TEST_OVERFLOWS_TYPE(s64, s32, (s64)S32_MIN - 1, true);
931 TEST_OVERFLOWS_TYPE(s64, s32, S64_MAX, true);
932 TEST_OVERFLOWS_TYPE(s64, s64, S64_MAX, false);
933 TEST_OVERFLOWS_TYPE(s64, s64, S64_MIN, false);
934#endif
935
936 /* Check for macro side-effects. */
937 var = INT_MAX - 1;
938 __TEST_OVERFLOWS_TYPE(__overflows_type, var++, int, false);
939 __TEST_OVERFLOWS_TYPE(__overflows_type, var++, int, false);
940 __TEST_OVERFLOWS_TYPE(__overflows_type, var++, int, true);
941 var = INT_MAX - 1;
942 __TEST_OVERFLOWS_TYPE(overflows_type, var++, int, false);
943 __TEST_OVERFLOWS_TYPE(overflows_type, var++, int, false);
944 __TEST_OVERFLOWS_TYPE(overflows_type, var++, int, true);
945
946 kunit_info(test, "%d overflows_type() tests finished\n", count);
947#undef TEST_OVERFLOWS_TYPE
948#undef __TEST_OVERFLOWS_TYPE
949}
950
951static void same_type_test(struct kunit *test)
952{
953 int count = 0;
954 int var;
955
956#define TEST_SAME_TYPE(t1, t2, same) do { \
957 typeof(t1) __t1h = type_max(t1); \
958 typeof(t1) __t1l = type_min(t1); \
959 typeof(t2) __t2h = type_max(t2); \
960 typeof(t2) __t2l = type_min(t2); \
961 KUNIT_EXPECT_EQ(test, true, __same_type(t1, __t1h)); \
962 KUNIT_EXPECT_EQ(test, true, __same_type(t1, __t1l)); \
963 KUNIT_EXPECT_EQ(test, true, __same_type(__t1h, t1)); \
964 KUNIT_EXPECT_EQ(test, true, __same_type(__t1l, t1)); \
965 KUNIT_EXPECT_EQ(test, true, __same_type(t2, __t2h)); \
966 KUNIT_EXPECT_EQ(test, true, __same_type(t2, __t2l)); \
967 KUNIT_EXPECT_EQ(test, true, __same_type(__t2h, t2)); \
968 KUNIT_EXPECT_EQ(test, true, __same_type(__t2l, t2)); \
969 KUNIT_EXPECT_EQ(test, same, __same_type(t1, t2)); \
970 KUNIT_EXPECT_EQ(test, same, __same_type(t2, __t1h)); \
971 KUNIT_EXPECT_EQ(test, same, __same_type(t2, __t1l)); \
972 KUNIT_EXPECT_EQ(test, same, __same_type(__t1h, t2)); \
973 KUNIT_EXPECT_EQ(test, same, __same_type(__t1l, t2)); \
974 KUNIT_EXPECT_EQ(test, same, __same_type(t1, __t2h)); \
975 KUNIT_EXPECT_EQ(test, same, __same_type(t1, __t2l)); \
976 KUNIT_EXPECT_EQ(test, same, __same_type(__t2h, t1)); \
977 KUNIT_EXPECT_EQ(test, same, __same_type(__t2l, t1)); \
978} while (0)
979
980#if BITS_PER_LONG == 64
981# define TEST_SAME_TYPE64(base, t, m) TEST_SAME_TYPE(base, t, m)
982#else
983# define TEST_SAME_TYPE64(base, t, m) do { } while (0)
984#endif
985
986#define TEST_TYPE_SETS(base, mu8, mu16, mu32, ms8, ms16, ms32, mu64, ms64) \
987do { \
988 TEST_SAME_TYPE(base, u8, mu8); \
989 TEST_SAME_TYPE(base, u16, mu16); \
990 TEST_SAME_TYPE(base, u32, mu32); \
991 TEST_SAME_TYPE(base, s8, ms8); \
992 TEST_SAME_TYPE(base, s16, ms16); \
993 TEST_SAME_TYPE(base, s32, ms32); \
994 TEST_SAME_TYPE64(base, u64, mu64); \
995 TEST_SAME_TYPE64(base, s64, ms64); \
996} while (0)
997
998 TEST_TYPE_SETS(u8, true, false, false, false, false, false, false, false);
999 TEST_TYPE_SETS(u16, false, true, false, false, false, false, false, false);
1000 TEST_TYPE_SETS(u32, false, false, true, false, false, false, false, false);
1001 TEST_TYPE_SETS(s8, false, false, false, true, false, false, false, false);
1002 TEST_TYPE_SETS(s16, false, false, false, false, true, false, false, false);
1003 TEST_TYPE_SETS(s32, false, false, false, false, false, true, false, false);
1004#if BITS_PER_LONG == 64
1005 TEST_TYPE_SETS(u64, false, false, false, false, false, false, true, false);
1006 TEST_TYPE_SETS(s64, false, false, false, false, false, false, false, true);
1007#endif
1008
1009 /* Check for macro side-effects. */
1010 var = 4;
1011 KUNIT_EXPECT_EQ(test, var, 4);
1012 KUNIT_EXPECT_TRUE(test, __same_type(var++, int));
1013 KUNIT_EXPECT_EQ(test, var, 4);
1014 KUNIT_EXPECT_TRUE(test, __same_type(int, var++));
1015 KUNIT_EXPECT_EQ(test, var, 4);
1016 KUNIT_EXPECT_TRUE(test, __same_type(var++, var++));
1017 KUNIT_EXPECT_EQ(test, var, 4);
1018
1019 kunit_info(test, "%d __same_type() tests finished\n", count);
1020
1021#undef TEST_TYPE_SETS
1022#undef TEST_SAME_TYPE64
1023#undef TEST_SAME_TYPE
1024}
1025
1026static void castable_to_type_test(struct kunit *test)
1027{
1028 int count = 0;
1029
1030#define TEST_CASTABLE_TO_TYPE(arg1, arg2, pass) do { \
1031 bool __pass = castable_to_type(arg1, arg2); \
1032 KUNIT_EXPECT_EQ_MSG(test, __pass, pass, \
1033 "expected castable_to_type(" #arg1 ", " #arg2 ") to%s pass\n",\
1034 pass ? "" : " not"); \
1035 count++; \
1036} while (0)
1037
1038 TEST_CASTABLE_TO_TYPE(16, u8, true);
1039 TEST_CASTABLE_TO_TYPE(16, u16, true);
1040 TEST_CASTABLE_TO_TYPE(16, u32, true);
1041 TEST_CASTABLE_TO_TYPE(16, s8, true);
1042 TEST_CASTABLE_TO_TYPE(16, s16, true);
1043 TEST_CASTABLE_TO_TYPE(16, s32, true);
1044 TEST_CASTABLE_TO_TYPE(-16, s8, true);
1045 TEST_CASTABLE_TO_TYPE(-16, s16, true);
1046 TEST_CASTABLE_TO_TYPE(-16, s32, true);
1047#if BITS_PER_LONG == 64
1048 TEST_CASTABLE_TO_TYPE(16, u64, true);
1049 TEST_CASTABLE_TO_TYPE(-16, s64, true);
1050#endif
1051
1052#define TEST_CASTABLE_TO_TYPE_VAR(width) do { \
1053 u ## width u ## width ## var = 0; \
1054 s ## width s ## width ## var = 0; \
1055 \
1056 /* Constant expressions that fit types. */ \
1057 TEST_CASTABLE_TO_TYPE(type_max(u ## width), u ## width, true); \
1058 TEST_CASTABLE_TO_TYPE(type_min(u ## width), u ## width, true); \
1059 TEST_CASTABLE_TO_TYPE(type_max(u ## width), u ## width ## var, true); \
1060 TEST_CASTABLE_TO_TYPE(type_min(u ## width), u ## width ## var, true); \
1061 TEST_CASTABLE_TO_TYPE(type_max(s ## width), s ## width, true); \
1062 TEST_CASTABLE_TO_TYPE(type_min(s ## width), s ## width, true); \
1063 TEST_CASTABLE_TO_TYPE(type_max(s ## width), s ## width ## var, true); \
1064 TEST_CASTABLE_TO_TYPE(type_min(u ## width), s ## width ## var, true); \
1065 /* Constant expressions that do not fit types. */ \
1066 TEST_CASTABLE_TO_TYPE(type_max(u ## width), s ## width, false); \
1067 TEST_CASTABLE_TO_TYPE(type_max(u ## width), s ## width ## var, false); \
1068 TEST_CASTABLE_TO_TYPE(type_min(s ## width), u ## width, false); \
1069 TEST_CASTABLE_TO_TYPE(type_min(s ## width), u ## width ## var, false); \
1070 /* Non-constant expression with mismatched type. */ \
1071 TEST_CASTABLE_TO_TYPE(s ## width ## var, u ## width, false); \
1072 TEST_CASTABLE_TO_TYPE(u ## width ## var, s ## width, false); \
1073} while (0)
1074
1075#define TEST_CASTABLE_TO_TYPE_RANGE(width) do { \
1076 unsigned long big = U ## width ## _MAX; \
1077 signed long small = S ## width ## _MIN; \
1078 u ## width u ## width ## var = 0; \
1079 s ## width s ## width ## var = 0; \
1080 \
1081 /* Constant expression in range. */ \
1082 TEST_CASTABLE_TO_TYPE(U ## width ## _MAX, u ## width, true); \
1083 TEST_CASTABLE_TO_TYPE(U ## width ## _MAX, u ## width ## var, true); \
1084 TEST_CASTABLE_TO_TYPE(S ## width ## _MIN, s ## width, true); \
1085 TEST_CASTABLE_TO_TYPE(S ## width ## _MIN, s ## width ## var, true); \
1086 /* Constant expression out of range. */ \
1087 TEST_CASTABLE_TO_TYPE((unsigned long)U ## width ## _MAX + 1, u ## width, false); \
1088 TEST_CASTABLE_TO_TYPE((unsigned long)U ## width ## _MAX + 1, u ## width ## var, false); \
1089 TEST_CASTABLE_TO_TYPE((signed long)S ## width ## _MIN - 1, s ## width, false); \
1090 TEST_CASTABLE_TO_TYPE((signed long)S ## width ## _MIN - 1, s ## width ## var, false); \
1091 /* Non-constant expression with mismatched type. */ \
1092 TEST_CASTABLE_TO_TYPE(big, u ## width, false); \
1093 TEST_CASTABLE_TO_TYPE(big, u ## width ## var, false); \
1094 TEST_CASTABLE_TO_TYPE(small, s ## width, false); \
1095 TEST_CASTABLE_TO_TYPE(small, s ## width ## var, false); \
1096} while (0)
1097
1098 TEST_CASTABLE_TO_TYPE_VAR(8);
1099 TEST_CASTABLE_TO_TYPE_VAR(16);
1100 TEST_CASTABLE_TO_TYPE_VAR(32);
1101#if BITS_PER_LONG == 64
1102 TEST_CASTABLE_TO_TYPE_VAR(64);
1103#endif
1104
1105 TEST_CASTABLE_TO_TYPE_RANGE(8);
1106 TEST_CASTABLE_TO_TYPE_RANGE(16);
1107#if BITS_PER_LONG == 64
1108 TEST_CASTABLE_TO_TYPE_RANGE(32);
1109#endif
1110 kunit_info(test, "%d castable_to_type() tests finished\n", count);
1111
1112#undef TEST_CASTABLE_TO_TYPE_RANGE
1113#undef TEST_CASTABLE_TO_TYPE_VAR
1114#undef TEST_CASTABLE_TO_TYPE
1115}
1116
1117static struct kunit_case overflow_test_cases[] = {
1118 KUNIT_CASE(u8_u8__u8_overflow_test),
1119 KUNIT_CASE(s8_s8__s8_overflow_test),
1120 KUNIT_CASE(u16_u16__u16_overflow_test),
1121 KUNIT_CASE(s16_s16__s16_overflow_test),
1122 KUNIT_CASE(u32_u32__u32_overflow_test),
1123 KUNIT_CASE(s32_s32__s32_overflow_test),
1124 KUNIT_CASE(u64_u64__u64_overflow_test),
1125 KUNIT_CASE(s64_s64__s64_overflow_test),
1126 KUNIT_CASE(u32_u32__int_overflow_test),
1127 KUNIT_CASE(u32_u32__u8_overflow_test),
1128 KUNIT_CASE(u8_u8__int_overflow_test),
1129 KUNIT_CASE(int_int__u8_overflow_test),
1130 KUNIT_CASE(shift_sane_test),
1131 KUNIT_CASE(shift_overflow_test),
1132 KUNIT_CASE(shift_truncate_test),
1133 KUNIT_CASE(shift_nonsense_test),
1134 KUNIT_CASE(overflow_allocation_test),
1135 KUNIT_CASE(overflow_size_helpers_test),
1136 KUNIT_CASE(overflows_type_test),
1137 KUNIT_CASE(same_type_test),
1138 KUNIT_CASE(castable_to_type_test),
1139 {}
1140};
1141
1142static struct kunit_suite overflow_test_suite = {
1143 .name = "overflow",
1144 .test_cases = overflow_test_cases,
1145};
1146
1147kunit_test_suite(overflow_test_suite);
1148
1149MODULE_LICENSE("Dual MIT/GPL");