4aee28c67b
Of course, this should never happen, but let's better be safe than sorry, and abort rather than continue when a too large memory block is allocated, simply asa safety precaution. An early abort is better than continuing with a likely memory corruption later.
163 lines
6.4 KiB
C
163 lines
6.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <alloca.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include "macro.h"
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typedef void (*free_func_t)(void *p);
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/* If for some reason more than 4M are allocated on the stack, let's abort immediately. It's better than
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* proceeding and smashing the stack limits. Note that by default RLIMIT_STACK is 8M on Linux. */
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#define ALLOCA_MAX (4U*1024U*1024U)
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#define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
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#define new0(t, n) ((t*) calloc((n) ?: 1, sizeof(t)))
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#define newa(t, n) \
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({ \
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size_t _n_ = n; \
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assert(!size_multiply_overflow(sizeof(t), _n_)); \
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assert(sizeof(t)*_n_ <= ALLOCA_MAX); \
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(t*) alloca(sizeof(t)*_n_); \
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})
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#define newa0(t, n) \
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({ \
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size_t _n_ = n; \
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assert(!size_multiply_overflow(sizeof(t), _n_)); \
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assert(sizeof(t)*_n_ <= ALLOCA_MAX); \
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(t*) alloca0(sizeof(t)*_n_); \
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})
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#define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
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#define newdup_suffix0(t, p, n) ((t*) memdup_suffix0_multiply(p, sizeof(t), (n)))
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#define malloc0(n) (calloc(1, (n)))
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static inline void *mfree(void *memory) {
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free(memory);
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return NULL;
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}
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#define free_and_replace(a, b) \
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({ \
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free(a); \
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(a) = (b); \
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(b) = NULL; \
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0; \
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})
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void* memdup(const void *p, size_t l) _alloc_(2);
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void* memdup_suffix0(const void *p, size_t l) _alloc_(2);
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#define memdupa(p, l) \
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({ \
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void *_q_; \
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size_t _l_ = l; \
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assert(_l_ <= ALLOCA_MAX); \
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_q_ = alloca(_l_); \
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memcpy(_q_, p, _l_); \
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})
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#define memdupa_suffix0(p, l) \
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({ \
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void *_q_; \
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size_t _l_ = l; \
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assert(_l_ <= ALLOCA_MAX); \
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_q_ = alloca(_l_ + 1); \
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((uint8_t*) _q_)[_l_] = 0; \
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memcpy(_q_, p, _l_); \
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})
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static inline void freep(void *p) {
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free(*(void**) p);
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}
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#define _cleanup_free_ _cleanup_(freep)
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static inline bool size_multiply_overflow(size_t size, size_t need) {
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return _unlikely_(need != 0 && size > (SIZE_MAX / need));
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}
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_malloc_ _alloc_(1, 2) static inline void *malloc_multiply(size_t size, size_t need) {
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if (size_multiply_overflow(size, need))
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return NULL;
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return malloc(size * need ?: 1);
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}
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#if !HAVE_REALLOCARRAY
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_alloc_(2, 3) static inline void *reallocarray(void *p, size_t need, size_t size) {
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if (size_multiply_overflow(size, need))
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return NULL;
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return realloc(p, size * need ?: 1);
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}
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#endif
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_alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t size, size_t need) {
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if (size_multiply_overflow(size, need))
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return NULL;
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return memdup(p, size * need);
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}
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_alloc_(2, 3) static inline void *memdup_suffix0_multiply(const void *p, size_t size, size_t need) {
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if (size_multiply_overflow(size, need))
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return NULL;
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return memdup_suffix0(p, size * need);
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}
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void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size);
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void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size);
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#define GREEDY_REALLOC(array, allocated, need) \
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greedy_realloc((void**) &(array), &(allocated), (need), sizeof((array)[0]))
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#define GREEDY_REALLOC0(array, allocated, need) \
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greedy_realloc0((void**) &(array), &(allocated), (need), sizeof((array)[0]))
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#define alloca0(n) \
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({ \
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char *_new_; \
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size_t _len_ = n; \
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assert(_len_ <= ALLOCA_MAX); \
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_new_ = alloca(_len_); \
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(void *) memset(_new_, 0, _len_); \
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})
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/* It's not clear what alignment glibc/gcc alloca() guarantee, hence provide a guaranteed safe version */
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#define alloca_align(size, align) \
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({ \
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void *_ptr_; \
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size_t _mask_ = (align) - 1; \
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size_t _size_ = size; \
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assert(_size_ <= ALLOCA_MAX); \
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_ptr_ = alloca(_size_ + _mask_); \
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(void*)(((uintptr_t)_ptr_ + _mask_) & ~_mask_); \
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})
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#define alloca0_align(size, align) \
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({ \
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void *_new_; \
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size_t _xsize_ = (size); \
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_new_ = alloca_align(_xsize_, (align)); \
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(void*)memset(_new_, 0, _xsize_); \
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})
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/* Takes inspiration from Rusts's Option::take() method: reads and returns a pointer, but at the same time resets it to
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* NULL. See: https://doc.rust-lang.org/std/option/enum.Option.html#method.take */
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#define TAKE_PTR(ptr) \
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({ \
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typeof(ptr) _ptr_ = (ptr); \
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(ptr) = NULL; \
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_ptr_; \
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})
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