| #include "phpdbg_sigsafe.h" |
| #include "phpdbg.h" |
|
|
| ZEND_EXTERN_MODULE_GLOBALS(phpdbg) |
|
|
| #define STR(x) #x |
| #define EXP_STR(x) STR(x) |
|
|
| static void* zend_mm_mem_alloc(zend_mm_storage *storage, size_t size, size_t alignment) { |
|
|
| if (EXPECTED(size <= PHPDBG_SIGSAFE_MEM_SIZE && !PHPDBG_G(sigsafe_mem).allocated)) { |
| PHPDBG_G(sigsafe_mem).allocated = 1; |
| return (void *) (((size_t) PHPDBG_G(sigsafe_mem).mem & ~(alignment - 1)) + alignment); |
| } |
|
|
| zend_quiet_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")); |
|
|
| if (*EG(bailout)) { |
| LONGJMP(*EG(bailout), FAILURE); |
| } |
|
|
| zend_quiet_write(PHPDBG_G(io)[PHPDBG_STDERR].fd, ZEND_STRL("Bailed out without a bailout address in signal handler!\n")); |
|
|
| return NULL; |
| } |
|
|
| static void zend_mm_mem_free(zend_mm_storage *storage, void *ptr, size_t size) { |
| } |
|
|
| void phpdbg_set_sigsafe_mem(char *buffer) { |
| phpdbg_signal_safe_mem *mem = &PHPDBG_G(sigsafe_mem); |
| const zend_mm_handlers phpdbg_handlers = { |
| zend_mm_mem_alloc, |
| zend_mm_mem_free, |
| NULL, |
| NULL, |
| }; |
|
|
| mem->mem = buffer; |
| mem->allocated = 0; |
|
|
| mem->heap = zend_mm_startup_ex(&phpdbg_handlers, NULL, 0); |
|
|
| mem->old_heap = zend_mm_set_heap(mem->heap); |
| } |
|
|
| zend_mm_heap *phpdbg_original_heap_sigsafe_mem(void) { |
| return PHPDBG_G(sigsafe_mem).old_heap; |
| } |
|
|
| void phpdbg_clear_sigsafe_mem(void) { |
| zend_mm_set_heap(phpdbg_original_heap_sigsafe_mem()); |
| PHPDBG_G(sigsafe_mem).mem = NULL; |
| } |
|
|
| bool phpdbg_active_sigsafe_mem(void) { |
| return !!PHPDBG_G(sigsafe_mem).mem; |
| } |
|
|
