1 // Test that out-of-scope local variables are ignored by LSan. 2 // RUN: LSAN_BASE="report_objects=1:use_registers=0:use_stacks=1" 3 // RUN: %clangxx_lsan %s -o %t 4 // RUN: %env_lsan_opts=$LSAN_BASE not %run %t 2>&1 | FileCheck %s 5 // RUN: %env_lsan_opts=$LSAN_BASE":exitcode=0" %run %t 2>&1 | FileCheck --check-prefix=CHECK-sanity %s 6 // 7 // x86 passes parameters through stack that may lead to false negatives 8 // UNSUPPORTED: x86,powerpc64 9 10 #include <stdio.h> 11 #include <stdlib.h> 12 #include "sanitizer_common/print_address.h" 13 14 void **pp; 15 16 // Put pointer far enough on the stack that LSan has space to run in without 17 // overwriting it. 18 // Hopefully the argument p will be passed on a register, saving us from false 19 // negatives. 20 __attribute__((noinline)) 21 void *PutPointerOnStaleStack(void *p) { 22 void *locals[2048]; 23 locals[0] = p; 24 pp = &locals[0]; 25 print_address("Test alloc: ", 1, locals[0]); 26 return 0; 27 } 28 29 int main() { 30 PutPointerOnStaleStack(malloc(1337)); 31 return 0; 32 } 33 34 // This must run after LSan, to ensure LSan didn't overwrite the pointer before 35 // it had a chance to see it. If LSan is invoked with atexit(), this works. 36 // Otherwise, we need a different method. 37 __attribute__((destructor)) 38 __attribute__((no_sanitize_address)) 39 void ConfirmPointerHasSurvived() { 40 print_address("Value after LSan: ", 1, *pp); 41 } 42 // CHECK: Test alloc: [[ADDR:0x[0-9,a-f]+]] 43 // CHECK-sanity: Test alloc: [[ADDR:0x[0-9,a-f]+]] 44 // CHECK: LeakSanitizer: detected memory leaks 45 // CHECK: [[ADDR]] (1337 bytes) 46 // CHECK: SUMMARY: {{(Leak|Address)}}Sanitizer: 47 // CHECK-sanity: Value after LSan: [[ADDR]] 48