mirror of
https://github.com/php/php-src.git
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112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
#include "phpdbg_sigsafe.h"
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#include "phpdbg.h"
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ZEND_EXTERN_MODULE_GLOBALS(phpdbg);
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static inline void zend_mm_init(zend_mm_heap *heap) {
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zend_mm_free_block *p;
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int i;
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heap->free_bitmap = 0;
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heap->large_free_bitmap = 0;
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#if ZEND_MM_CACHE
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heap->cached = 0;
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memset(heap->cache, 0, sizeof(heap->cache));
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#endif
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#if ZEND_MM_CACHE_STAT
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for (i = 0; i < ZEND_MM_NUM_BUCKETS; i++) {
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heap->cache_stat[i].count = 0;
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}
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#endif
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p = ZEND_MM_SMALL_FREE_BUCKET(heap, 0);
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for (i = 0; i < ZEND_MM_NUM_BUCKETS; i++) {
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p->next_free_block = p;
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p->prev_free_block = p;
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p = (zend_mm_free_block *)((char *)p + sizeof(zend_mm_free_block *) * 2);
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heap->large_free_buckets[i] = NULL;
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}
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heap->rest_buckets[0] = heap->rest_buckets[1] = ZEND_MM_REST_BUCKET(heap);
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heap->rest_count = 0;
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}
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static zend_mm_storage* zend_mm_mem_init(void *params) {
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TSRMLS_FETCH();
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return &PHPDBG_G(sigsafe_mem).storage;
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}
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static void zend_mm_mem_dummy(zend_mm_storage *storage) {
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}
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#define STR(x) #x
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#define EXP_STR(x) STR(x)
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static zend_mm_segment* zend_mm_mem_alloc(zend_mm_storage *storage, size_t size) {
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TSRMLS_FETCH();
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if (EXPECTED(size == PHPDBG_SIGSAFE_MEM_SIZE && !PHPDBG_G(sigsafe_mem).allocated)) {
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PHPDBG_G(sigsafe_mem).allocated = 1;
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return (zend_mm_segment *) PHPDBG_G(sigsafe_mem).mem;
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}
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write(PHPDBG_G(io)[PHPDBG_STDERR].fd, ZEND_STRL("Tried to allocate more than " EXP_STR(PHPDBG_SIGSAFE_MEM_SIZE) " bytes from stack memory in signal handler ... bailing out of signal handler\n"));
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if (*EG(bailout)) {
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LONGJMP(*EG(bailout), FAILURE);
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}
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write(PHPDBG_G(io)[PHPDBG_STDERR].fd, ZEND_STRL("Bailed out without a bailout address in signal handler!\n"));
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return NULL;
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}
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static zend_mm_segment* zend_mm_mem_realloc(zend_mm_storage *storage, zend_mm_segment *ptr, size_t size) {
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return zend_mm_mem_alloc(storage, size);
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}
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static void zend_mm_mem_free(zend_mm_storage *storage, zend_mm_segment *ptr) {
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}
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static const zend_mm_mem_handlers phpdbg_handlers_sigsafe_mem = { "stack", zend_mm_mem_init, zend_mm_mem_dummy, zend_mm_mem_dummy, zend_mm_mem_alloc, zend_mm_mem_realloc, zend_mm_mem_free };
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void phpdbg_set_sigsafe_mem(char *buffer TSRMLS_DC) {
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phpdbg_signal_safe_mem *mem = &PHPDBG_G(sigsafe_mem);
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mem->old_heap = zend_mm_set_heap(&mem->heap TSRMLS_CC);
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mem->mem = buffer;
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mem->allocated = 0;
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mem->storage.handlers = &phpdbg_handlers_sigsafe_mem;
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mem->heap.storage = &mem->storage;
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mem->heap.block_size = PHPDBG_SIGSAFE_MEM_SIZE;
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mem->heap.compact_size = 0;
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mem->heap.segments_list = NULL;
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zend_mm_init(&mem->heap);
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#if ZEND_MM_CACHE_STAT
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memset(mem->heap.cache_stat, 0, sizeof(mem->heap.cache_stat));
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#endif
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mem->heap.use_zend_alloc = 1;
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mem->heap.real_size = 0;
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mem->heap.overflow = 0;
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mem->heap.real_peak = 0;
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mem->heap.limit = PHPDBG_SIGSAFE_MEM_SIZE;
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mem->heap.size = 0;
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mem->heap.peak = 0;
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mem->heap.internal = 0;
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mem->heap.reserve = NULL;
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mem->heap.reserve_size = 0;
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}
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zend_mm_heap *phpdbg_original_heap_sigsafe_mem(TSRMLS_D) {
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return PHPDBG_G(sigsafe_mem).old_heap;
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}
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void phpdbg_clear_sigsafe_mem(TSRMLS_D) {
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zend_mm_set_heap(phpdbg_original_heap_sigsafe_mem(TSRMLS_C) TSRMLS_CC);
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PHPDBG_G(sigsafe_mem).mem = NULL;
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}
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zend_bool phpdbg_active_sigsafe_mem(TSRMLS_D) {
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return !!PHPDBG_G(sigsafe_mem).mem;
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}
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