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always use non-flat map in secure mode and validate pointers passed to free

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daanx 2025-05-21 16:32:06 -07:00
parent 09c2b7fdcf
commit 8a66ae818a
5 changed files with 13 additions and 3 deletions
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4
src/page-map.c
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@ -202,8 +202,12 @@ bool _mi_page_map_init(void) {
const size_t page_map_size = _mi_align_up( mi_page_map_count * sizeof(mi_page_t**), os_page_size);
const size_t submap_size = MI_PAGE_MAP_SUB_SIZE;
const size_t reserve_size = page_map_size + submap_size;
#if MI_SECURE
const bool commit = true; // the whole page map is valid and we can reliably check any pointer
#else
const bool commit = page_map_size <= 64*MI_KiB ||
mi_option_is_enabled(mi_option_pagemap_commit) || _mi_os_has_overcommit();
#endif
_mi_page_map = (_Atomic(mi_page_t**)*)_mi_os_alloc_aligned(reserve_size, 1, commit, true /* allow large */, &mi_page_map_memid);
if (_mi_page_map==NULL) {
_mi_error_message(ENOMEM, "unable to reserve virtual memory for the page map (%zu KiB)\n", page_map_size / MI_KiB);