1 // RUN: %clangxx_asan -O0 -mllvm -asan-instrument-allocas %s -o %t 2 // RUN: %run %t 2>&1 3 // 4 // REQUIRES: stable-runtime 5 6 // This testcase checks that allocas and VLAs inside loop are correctly unpoisoned. 7 8 #include <assert.h> 9 #include <stdint.h> 10 #include <stdlib.h> 11 #include "sanitizer/asan_interface.h" 12 13 // MSVC provides _alloca instead of alloca. 14 #if defined(_MSC_VER) && !defined(alloca) 15 # define alloca _alloca 16 #endif 17 18 void *top, *bot; 19 foo(int len)20__attribute__((noinline)) void foo(int len) { 21 char x; 22 top = &x; 23 char array[len]; // NOLINT 24 assert(!(reinterpret_cast<uintptr_t>(array) & 31L)); 25 alloca(len); 26 for (int i = 0; i < 32; ++i) { 27 char array[i]; // NOLINT 28 bot = alloca(i); 29 assert(!(reinterpret_cast<uintptr_t>(bot) & 31L)); 30 } 31 } 32 main(int argc,char ** argv)33int main(int argc, char **argv) { 34 foo(32); 35 void *q = __asan_region_is_poisoned(bot, (char *)top - (char *)bot); 36 assert(!q); 37 return 0; 38 } 39