compiler-rt/test/msan/realloc-large-origin.cpp

   1 // RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O0 %s -o %t && not %run %t >%t.out 2>&1
   2 // RUN: FileCheck --check-prefix=CHECK --check-prefix=CHECK-%short-stack %s < %t.out
   3 // RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -O2 %s -o %t && not %run %t >%t.out 2>&1
   4 // RUN: FileCheck --check-prefix=CHECK --check-prefix=CHECK-%short-stack %s < %t.out
   5
   6 // This is a regression test: there used to be broken "stored to memory at"
   7 // stacks with
   8 //   in __msan_memcpy
   9 //   in __msan::MsanReallocate
  10 // and nothing below that.
  11
  12 #include <stdlib.h>
  13 int main(int argc, char **argv) {
  14   char *p = (char *)malloc(100);
  15   p = (char *)realloc(p, 10000);
  16   char x = p[50];
  17   free(p);
  18   return x;
  19
  20 // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
  21 // CHECK:   {{#0 0x.* in main .*realloc-large-origin.cpp:}}[[@LINE-3]]
  22
  23 // CHECK:  Uninitialized value was stored to memory at
  24 // CHECK-FULL-STACK:   {{#0 0x.* in .*realloc}}
  25 // CHECK-FULL-STACK:   {{#1 0x.* in main .*realloc-large-origin.cpp:}}[[@LINE-10]]
  26 // CHECK-SHORT-STACK:   {{#0 0x.* in .*realloc}}
  27
  28 // CHECK:   Uninitialized value was created by a heap allocation
  29 // CHECK:   {{#0 0x.* in .*malloc}}
  30 // CHECK:   {{#1 0x.* in main .*realloc-large-origin.cpp:}}[[@LINE-16]]
  31 }