summaryrefslogtreecommitdiff
path: root/include/linux/overflow.h
blob: 0c7e3dcfe8670cb95f371a6f7d41bb8b63b1786c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
#ifndef __LINUX_OVERFLOW_H
#define __LINUX_OVERFLOW_H

#include <linux/compiler.h>
#include <linux/limits.h>
#include <linux/const.h>

/*
 * We need to compute the minimum and maximum values representable in a given
 * type. These macros may also be useful elsewhere. It would seem more obvious
 * to do something like:
 *
 * #define type_min(T) (T)(is_signed_type(T) ? (T)1 << (8*sizeof(T)-1) : 0)
 * #define type_max(T) (T)(is_signed_type(T) ? ((T)1 << (8*sizeof(T)-1)) - 1 : ~(T)0)
 *
 * Unfortunately, the middle expressions, strictly speaking, have
 * undefined behaviour, and at least some versions of gcc warn about
 * the type_max expression (but not if -fsanitize=undefined is in
 * effect; in that case, the warning is deferred to runtime...).
 *
 * The slightly excessive casting in type_min is to make sure the
 * macros also produce sensible values for the exotic type _Bool. [The
 * overflow checkers only almost work for _Bool, but that's
 * a-feature-not-a-bug, since people shouldn't be doing arithmetic on
 * _Bools. Besides, the gcc builtins don't allow _Bool* as third
 * argument.]
 *
 * Idea stolen from
 * https://mail-index.netbsd.org/tech-misc/2007/02/05/0000.html -
 * credit to Christian Biere.
 */
#define __type_half_max(type) ((type)1 << (8*sizeof(type) - 1 - is_signed_type(type)))
#define __type_max(T) ((T)((__type_half_max(T) - 1) + __type_half_max(T)))
#define type_max(t)	__type_max(typeof(t))
#define __type_min(T) ((T)((T)-type_max(T)-(T)1))
#define type_min(t)	__type_min(typeof(t))

/*
 * Avoids triggering -Wtype-limits compilation warning,
 * while using unsigned data types to check a < 0.
 */
#define is_non_negative(a) ((a) > 0 || (a) == 0)
#define is_negative(a) (!(is_non_negative(a)))

/*
 * Allows for effectively applying __must_check to a macro so we can have
 * both the type-agnostic benefits of the macros while also being able to
 * enforce that the return value is, in fact, checked.
 */
static inline bool __must_check __must_check_overflow(bool overflow)
{
	return unlikely(overflow);
}

/**
 * check_add_overflow() - Calculate addition with overflow checking
 * @a: first addend
 * @b: second addend
 * @d: pointer to store sum
 *
 * Returns true on wrap-around, false otherwise.
 *
 * *@d holds the results of the attempted addition, regardless of whether
 * wrap-around occurred.
 */
#define check_add_overflow(a, b, d)	\
	__must_check_overflow(__builtin_add_overflow(a, b, d))

/**
 * wrapping_add() - Intentionally perform a wrapping addition
 * @type: type for result of calculation
 * @a: first addend
 * @b: second addend
 *
 * Return the potentially wrapped-around addition without
 * tripping any wrap-around sanitizers that may be enabled.
 */
#define wrapping_add(type, a, b)				\
	({							\
		type __val;					\
		__builtin_add_overflow(a, b, &__val);		\
		__val;						\
	})

/**
 * wrapping_assign_add() - Intentionally perform a wrapping increment assignment
 * @var: variable to be incremented
 * @offset: amount to add
 *
 * Increments @var by @offset with wrap-around. Returns the resulting
 * value of @var. Will not trip any wrap-around sanitizers.
 *
 * Returns the new value of @var.
 */
#define wrapping_assign_add(var, offset)				\
	({								\
		typeof(var) *__ptr = &(var);				\
		*__ptr = wrapping_add(typeof(var), *__ptr, offset);	\
	})

/**
 * check_sub_overflow() - Calculate subtraction with overflow checking
 * @a: minuend; value to subtract from
 * @b: subtrahend; value to subtract from @a
 * @d: pointer to store difference
 *
 * Returns true on wrap-around, false otherwise.
 *
 * *@d holds the results of the attempted subtraction, regardless of whether
 * wrap-around occurred.
 */
#define check_sub_overflow(a, b, d)	\
	__must_check_overflow(__builtin_sub_overflow(a, b, d))

/**
 * wrapping_sub() - Intentionally perform a wrapping subtraction
 * @type: type for result of calculation
 * @a: minuend; value to subtract from
 * @b: subtrahend; value to subtract from @a
 *
 * Return the potentially wrapped-around subtraction without
 * tripping any wrap-around sanitizers that may be enabled.
 */
#define wrapping_sub(type, a, b)				\
	({							\
		type __val;					\
		__builtin_sub_overflow(a, b, &__val);		\
		__val;						\
	})

/**
 * wrapping_assign_sub() - Intentionally perform a wrapping decrement assign
 * @var: variable to be decremented
 * @offset: amount to subtract
 *
 * Decrements @var by @offset with wrap-around. Returns the resulting
 * value of @var. Will not trip any wrap-around sanitizers.
 *
 * Returns the new value of @var.
 */
#define wrapping_assign_sub(var, offset)				\
	({								\
		typeof(var) *__ptr = &(var);				\
		*__ptr = wrapping_sub(typeof(var), *__ptr, offset);	\
	})

/**
 * check_mul_overflow() - Calculate multiplication with overflow checking
 * @a: first factor
 * @b: second factor
 * @d: pointer to store product
 *
 * Returns true on wrap-around, false otherwise.
 *
 * *@d holds the results of the attempted multiplication, regardless of whether
 * wrap-around occurred.
 */
#define check_mul_overflow(a, b, d)	\
	__must_check_overflow(__builtin_mul_overflow(a, b, d))

/**
 * wrapping_mul() - Intentionally perform a wrapping multiplication
 * @type: type for result of calculation
 * @a: first factor
 * @b: second factor
 *
 * Return the potentially wrapped-around multiplication without
 * tripping any wrap-around sanitizers that may be enabled.
 */
#define wrapping_mul(type, a, b)				\
	({							\
		type __val;					\
		__builtin_mul_overflow(a, b, &__val);		\
		__val;						\
	})

/**
 * check_shl_overflow() - Calculate a left-shifted value and check overflow
 * @a: Value to be shifted
 * @s: How many bits left to shift
 * @d: Pointer to where to store the result
 *
 * Computes *@d = (@a << @s)
 *
 * Returns true if '*@d' cannot hold the result or when '@a << @s' doesn't
 * make sense. Example conditions:
 *
 * - '@a << @s' causes bits to be lost when stored in *@d.
 * - '@s' is garbage (e.g. negative) or so large that the result of
 *   '@a << @s' is guaranteed to be 0.
 * - '@a' is negative.
 * - '@a << @s' sets the sign bit, if any, in '*@d'.
 *
 * '*@d' will hold the results of the attempted shift, but is not
 * considered "safe for use" if true is returned.
 */
#define check_shl_overflow(a, s, d) __must_check_overflow(({		\
	typeof(a) _a = a;						\
	typeof(s) _s = s;						\
	typeof(d) _d = d;						\
	unsigned long long _a_full = _a;				\
	unsigned int _to_shift =					\
		is_non_negative(_s) && _s < 8 * sizeof(*d) ? _s : 0;	\
	*_d = (_a_full << _to_shift);					\
	(_to_shift != _s || is_negative(*_d) || is_negative(_a) ||	\
	(*_d >> _to_shift) != _a);					\
}))

#define __overflows_type_constexpr(x, T) (			\
	is_unsigned_type(typeof(x)) ?				\
		(x) > type_max(T) :				\
	is_unsigned_type(typeof(T)) ?				\
		(x) < 0 || (x) > type_max(T) :			\
	(x) < type_min(T) || (x) > type_max(T))

#define __overflows_type(x, T)		({	\
	typeof(T) v = 0;			\
	check_add_overflow((x), v, &v);		\
})

/**
 * overflows_type - helper for checking the overflows between value, variables,
 *		    or data type
 *
 * @n: source constant value or variable to be checked
 * @T: destination variable or data type proposed to store @x
 *
 * Compares the @x expression for whether or not it can safely fit in
 * the storage of the type in @T. @x and @T can have different types.
 * If @x is a constant expression, this will also resolve to a constant
 * expression.
 *
 * Returns: true if overflow can occur, false otherwise.
 */
#define overflows_type(n, T)					\
	__builtin_choose_expr(__is_constexpr(n),		\
			      __overflows_type_constexpr(n, T),	\
			      __overflows_type(n, T))

/**
 * castable_to_type - like __same_type(), but also allows for casted literals
 *
 * @n: variable or constant value
 * @T: variable or data type
 *
 * Unlike the __same_type() macro, this allows a constant value as the
 * first argument. If this value would not overflow into an assignment
 * of the second argument's type, it returns true. Otherwise, this falls
 * back to __same_type().
 */
#define castable_to_type(n, T)						\
	__builtin_choose_expr(__is_constexpr(n),			\
			      !__overflows_type_constexpr(n, T),	\
			      __same_type(n, T))

/**
 * size_mul() - Calculate size_t multiplication with saturation at SIZE_MAX
 * @factor1: first factor
 * @factor2: second factor
 *
 * Returns: calculate @factor1 * @factor2, both promoted to size_t,
 * with any overflow causing the return value to be SIZE_MAX. The
 * lvalue must be size_t to avoid implicit type conversion.
 */
static inline size_t __must_check size_mul(size_t factor1, size_t factor2)
{
	size_t bytes;

	if (check_mul_overflow(factor1, factor2, &bytes))
		return SIZE_MAX;

	return bytes;
}

/**
 * size_add() - Calculate size_t addition with saturation at SIZE_MAX
 * @addend1: first addend
 * @addend2: second addend
 *
 * Returns: calculate @addend1 + @addend2, both promoted to size_t,
 * with any overflow causing the return value to be SIZE_MAX. The
 * lvalue must be size_t to avoid implicit type conversion.
 */
static inline size_t __must_check size_add(size_t addend1, size_t addend2)
{
	size_t bytes;

	if (check_add_overflow(addend1, addend2, &bytes))
		return SIZE_MAX;

	return bytes;
}

/**
 * size_sub() - Calculate size_t subtraction with saturation at SIZE_MAX
 * @minuend: value to subtract from
 * @subtrahend: value to subtract from @minuend
 *
 * Returns: calculate @minuend - @subtrahend, both promoted to size_t,
 * with any overflow causing the return value to be SIZE_MAX. For
 * composition with the size_add() and size_mul() helpers, neither
 * argument may be SIZE_MAX (or the result with be forced to SIZE_MAX).
 * The lvalue must be size_t to avoid implicit type conversion.
 */
static inline size_t __must_check size_sub(size_t minuend, size_t subtrahend)
{
	size_t bytes;

	if (minuend == SIZE_MAX || subtrahend == SIZE_MAX ||
	    check_sub_overflow(minuend, subtrahend, &bytes))
		return SIZE_MAX;

	return bytes;
}

/**
 * array_size() - Calculate size of 2-dimensional array.
 * @a: dimension one
 * @b: dimension two
 *
 * Calculates size of 2-dimensional array: @a * @b.
 *
 * Returns: number of bytes needed to represent the array or SIZE_MAX on
 * overflow.
 */
#define array_size(a, b)	size_mul(a, b)

/**
 * array3_size() - Calculate size of 3-dimensional array.
 * @a: dimension one
 * @b: dimension two
 * @c: dimension three
 *
 * Calculates size of 3-dimensional array: @a * @b * @c.
 *
 * Returns: number of bytes needed to represent the array or SIZE_MAX on
 * overflow.
 */
#define array3_size(a, b, c)	size_mul(size_mul(a, b), c)

/**
 * flex_array_size() - Calculate size of a flexible array member
 *                     within an enclosing structure.
 * @p: Pointer to the structure.
 * @member: Name of the flexible array member.
 * @count: Number of elements in the array.
 *
 * Calculates size of a flexible array of @count number of @member
 * elements, at the end of structure @p.
 *
 * Return: number of bytes needed or SIZE_MAX on overflow.
 */
#define flex_array_size(p, member, count)				\
	__builtin_choose_expr(__is_constexpr(count),			\
		(count) * sizeof(*(p)->member) + __must_be_array((p)->member),	\
		size_mul(count, sizeof(*(p)->member) + __must_be_array((p)->member)))

/**
 * struct_size() - Calculate size of structure with trailing flexible array.
 * @p: Pointer to the structure.
 * @member: Name of the array member.
 * @count: Number of elements in the array.
 *
 * Calculates size of memory needed for structure of @p followed by an
 * array of @count number of @member elements.
 *
 * Return: number of bytes needed or SIZE_MAX on overflow.
 */
#define struct_size(p, member, count)					\
	__builtin_choose_expr(__is_constexpr(count),			\
		sizeof(*(p)) + flex_array_size(p, member, count),	\
		size_add(sizeof(*(p)), flex_array_size(p, member, count)))

/**
 * struct_size_t() - Calculate size of structure with trailing flexible array
 * @type: structure type name.
 * @member: Name of the array member.
 * @count: Number of elements in the array.
 *
 * Calculates size of memory needed for structure @type followed by an
 * array of @count number of @member elements. Prefer using struct_size()
 * when possible instead, to keep calculations associated with a specific
 * instance variable of type @type.
 *
 * Return: number of bytes needed or SIZE_MAX on overflow.
 */
#define struct_size_t(type, member, count)					\
	struct_size((type *)NULL, member, count)

/**
 * _DEFINE_FLEX() - helper macro for DEFINE_FLEX() family.
 * Enables caller macro to pass (different) initializer.
 *
 * @type: structure type name, including "struct" keyword.
 * @name: Name for a variable to define.
 * @member: Name of the array member.
 * @count: Number of elements in the array; must be compile-time const.
 * @initializer: initializer expression (could be empty for no init).
 */
#define _DEFINE_FLEX(type, name, member, count, initializer...)			\
	_Static_assert(__builtin_constant_p(count),				\
		       "onstack flex array members require compile-time const count"); \
	union {									\
		u8 bytes[struct_size_t(type, member, count)];			\
		type obj;							\
	} name##_u initializer;							\
	type *name = (type *)&name##_u

/**
 * DEFINE_RAW_FLEX() - Define an on-stack instance of structure with a trailing
 * flexible array member, when it does not have a __counted_by annotation.
 *
 * @type: structure type name, including "struct" keyword.
 * @name: Name for a variable to define.
 * @member: Name of the array member.
 * @count: Number of elements in the array; must be compile-time const.
 *
 * Define a zeroed, on-stack, instance of @type structure with a trailing
 * flexible array member.
 * Use __struct_size(@name) to get compile-time size of it afterwards.
 */
#define DEFINE_RAW_FLEX(type, name, member, count)	\
	_DEFINE_FLEX(type, name, member, count, = {})

/**
 * DEFINE_FLEX() - Define an on-stack instance of structure with a trailing
 * flexible array member.
 *
 * @TYPE: structure type name, including "struct" keyword.
 * @NAME: Name for a variable to define.
 * @MEMBER: Name of the array member.
 * @COUNTER: Name of the __counted_by member.
 * @COUNT: Number of elements in the array; must be compile-time const.
 *
 * Define a zeroed, on-stack, instance of @TYPE structure with a trailing
 * flexible array member.
 * Use __struct_size(@NAME) to get compile-time size of it afterwards.
 */
#define DEFINE_FLEX(TYPE, NAME, MEMBER, COUNTER, COUNT)	\
	_DEFINE_FLEX(TYPE, NAME, MEMBER, COUNT, = { .obj.COUNTER = COUNT, })

#endif /* __LINUX_OVERFLOW_H */