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