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112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*-
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* Copyright 2013-2018,2022 Alexander Peslyak
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef __unix__
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#include <sys/mman.h>
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#endif
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#ifdef __linux__
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#include <linux/mman.h> /* for MAP_HUGE_2MB */
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#endif
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#define HUGEPAGE_THRESHOLD (32 * 1024 * 1024)
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#ifdef __x86_64__
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#define HUGEPAGE_SIZE (2 * 1024 * 1024)
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#else
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#undef HUGEPAGE_SIZE
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#endif
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static void *alloc_region(yescrypt_region_t *region, size_t size)
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{
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size_t base_size = size;
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uint8_t *base, *aligned;
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#ifdef MAP_ANON
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int flags =
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#ifdef MAP_NOCORE
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MAP_NOCORE |
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#endif
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MAP_ANON | MAP_PRIVATE;
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#if defined(MAP_HUGETLB) && defined(MAP_HUGE_2MB) && defined(HUGEPAGE_SIZE)
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size_t new_size = size;
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const size_t hugepage_mask = (size_t)HUGEPAGE_SIZE - 1;
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if (size >= HUGEPAGE_THRESHOLD && size + hugepage_mask >= size) {
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flags |= MAP_HUGETLB | MAP_HUGE_2MB;
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/*
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* Linux's munmap() fails on MAP_HUGETLB mappings if size is not a multiple of
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* huge page size, so let's round up to huge page size here.
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*/
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new_size = size + hugepage_mask;
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new_size &= ~hugepage_mask;
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}
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base = mmap(NULL, new_size, PROT_READ | PROT_WRITE, flags, -1, 0);
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if (base != MAP_FAILED) {
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base_size = new_size;
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} else if (flags & MAP_HUGETLB) {
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flags &= ~(MAP_HUGETLB | MAP_HUGE_2MB);
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base = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, -1, 0);
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}
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#else
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base = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, -1, 0);
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#endif
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if (base == MAP_FAILED)
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base = NULL;
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aligned = base;
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#elif defined(HAVE_POSIX_MEMALIGN)
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if ((errno = posix_memalign((void **)&base, 64, size)) != 0)
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base = NULL;
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aligned = base;
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#else
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base = aligned = NULL;
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if (size + 63 < size) {
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errno = ENOMEM;
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} else if ((base = malloc(size + 63)) != NULL) {
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aligned = base + 63;
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aligned -= (uintptr_t)aligned & 63;
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}
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#endif
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region->base = base;
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region->aligned = aligned;
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region->base_size = base ? base_size : 0;
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region->aligned_size = base ? size : 0;
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return aligned;
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}
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static inline void init_region(yescrypt_region_t *region)
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{
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region->base = region->aligned = NULL;
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region->base_size = region->aligned_size = 0;
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}
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static int free_region(yescrypt_region_t *region)
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{
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return 0;
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if (region->base) {
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#ifdef MAP_ANON
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if (munmap(region->base, region->base_size))
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return -1;
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#else
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free(region->base);
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#endif
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}
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init_region(region);
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return 0;
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}
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