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/* SPDX-License-Identifier: GPL-2.0 OR MIT */
#ifndef __LINUX_OVERFLOW_H
#define __LINUX_OVERFLOW_H
#include <linux/compiler.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 is_signed_type(type) (((type)(-1)) < (type)1)
#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_min(T) ((T)((T)-type_max(T)-(T)1))
/*
* For simplicity and code hygiene, the fallback code below insists on
* a, b and *d having the same type (similar to the min() and max()
* macros), whereas gcc's type-generic overflow checkers accept
* different types. Hence we don't just make check_add_overflow an
* alias for __builtin_add_overflow, but add type checks similar to
* below.
*/
#define check_add_overflow(a, b, d) ({ \
typeof(a) __a = (a); \
typeof(b) __b = (b); \
typeof(d) __d = (d); \
(void) (&__a == &__b); \
(void) (&__a == __d); \
__builtin_add_overflow(__a, __b, __d); \
})
#define check_sub_overflow(a, b, d) ({ \
typeof(a) __a = (a); \
typeof(b) __b = (b); \
typeof(d) __d = (d); \
(void) (&__a == &__b); \
(void) (&__a == __d); \
__builtin_sub_overflow(__a, __b, __d); \
})
#define check_mul_overflow(a, b, d) ({ \
typeof(a) __a = (a); \
typeof(b) __b = (b); \
typeof(d) __d = (d); \
(void) (&__a == &__b); \
(void) (&__a == __d); \
__builtin_mul_overflow(__a, __b, __d); \
})
/**
* 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.
*/
static inline __must_check size_t array_size(size_t a, size_t b)
{
size_t bytes;
if (check_mul_overflow(a, b, &bytes))
return SIZE_MAX;
return bytes;
}
/**
* 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.
*/
static inline __must_check size_t array3_size(size_t a, size_t b, size_t c)
{
size_t bytes;
if (check_mul_overflow(a, b, &bytes))
return SIZE_MAX;
if (check_mul_overflow(bytes, c, &bytes))
return SIZE_MAX;
return bytes;
}
static inline __must_check size_t __ab_c_size(size_t n, size_t size, size_t c)
{
size_t bytes;
if (check_mul_overflow(n, size, &bytes))
return SIZE_MAX;
if (check_add_overflow(bytes, c, &bytes))
return SIZE_MAX;
return bytes;
}
/**
* struct_size() - Calculate size of structure with trailing array.
* @p: Pointer to the structure.
* @member: Name of the array member.
* @n: Number of elements in the array.
*
* Calculates size of memory needed for structure @p followed by an
* array of @n @member elements.
*
* Return: number of bytes needed or SIZE_MAX on overflow.
*/
#define struct_size(p, member, n) \
__ab_c_size(n, \
sizeof(*(p)->member) + __must_be_array((p)->member),\
sizeof(*(p)))
#endif /* __LINUX_OVERFLOW_H */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| sched | Folder | 0755 |
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| unaligned | Folder | 0755 |
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| align.h | File | 339 B | 0644 |
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| arm-smccc.h | File | 5.63 KB | 0644 |
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| atomic.h | File | 363 B | 0644 |
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| bitfield.h | File | 5.33 KB | 0644 |
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| bitmap.h | File | 4.82 KB | 0644 |
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| bitops.h | File | 2.15 KB | 0644 |
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| bits.h | File | 1.17 KB | 0644 |
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| btf_ids.h | File | 5.97 KB | 0644 |
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| bug.h | File | 442 B | 0644 |
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| build_bug.h | File | 3.04 KB | 0644 |
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| compiler-gcc.h | File | 1.24 KB | 0644 |
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| compiler.h | File | 5.82 KB | 0644 |
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| compiler_types.h | File | 1.09 KB | 0644 |
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| const.h | File | 421 B | 0644 |
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| coresight-pmu.h | File | 2.32 KB | 0644 |
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| ctype.h | File | 1.9 KB | 0644 |
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| debug_locks.h | File | 288 B | 0644 |
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| delay.h | File | 117 B | 0644 |
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| err.h | File | 1.99 KB | 0644 |
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| export.h | File | 129 B | 0644 |
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| filter.h | File | 9.59 KB | 0644 |
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| find.h | File | 5.77 KB | 0644 |
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| ftrace.h | File | 120 B | 0644 |
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| gfp.h | File | 322 B | 0644 |
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| gfp_types.h | File | 46 B | 0644 |
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| hardirq.h | File | 280 B | 0644 |
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| hash.h | File | 2.93 KB | 0644 |
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| hashtable.h | File | 4.44 KB | 0644 |
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| interrupt.h | File | 129 B | 0644 |
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| interval_tree_generic.h | File | 6.7 KB | 0644 |
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| irqflags.h | File | 1.37 KB | 0644 |
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| jhash.h | File | 4.46 KB | 0644 |
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| kallsyms.h | File | 646 B | 0644 |
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| kconfig.h | File | 2.39 KB | 0644 |
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| kern_levels.h | File | 954 B | 0644 |
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| kernel.h | File | 2.64 KB | 0644 |
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| linkage.h | File | 123 B | 0644 |
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| list.h | File | 22.48 KB | 0644 |
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| list_sort.h | File | 374 B | 0644 |
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| lockdep.h | File | 1.43 KB | 0644 |
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| log2.h | File | 4.46 KB | 0644 |
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| math.h | File | 764 B | 0644 |
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| math64.h | File | 1.22 KB | 0644 |
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| module.h | File | 270 B | 0644 |
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| mutex.h | File | 117 B | 0644 |
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| nmi.h | File | 0 B | 0644 |
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| numa.h | File | 292 B | 0644 |
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| objtool_types.h | File | 1.8 KB | 0644 |
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| overflow.h | File | 4.11 KB | 0644 |
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| poison.h | File | 2.5 KB | 0644 |
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| proc_fs.h | File | 123 B | 0644 |
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| rbtree.h | File | 9.32 KB | 0644 |
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| rbtree_augmented.h | File | 9.34 KB | 0644 |
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| rcu.h | File | 437 B | 0644 |
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| refcount.h | File | 4.11 KB | 0644 |
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| ring_buffer.h | File | 2.4 KB | 0644 |
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| rwsem.h | File | 920 B | 0644 |
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| seq_file.h | File | 126 B | 0644 |
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| sizes.h | File | 1.12 KB | 0644 |
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| slab.h | File | 1.17 KB | 0644 |
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| spinlock.h | File | 1.24 KB | 0644 |
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| stacktrace.h | File | 678 B | 0644 |
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| static_call_types.h | File | 2.74 KB | 0644 |
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| string.h | File | 1.4 KB | 0644 |
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| stringify.h | File | 380 B | 0644 |
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| time64.h | File | 347 B | 0644 |
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| types.h | File | 1.72 KB | 0644 |
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| zalloc.h | File | 252 B | 0644 |
|