src/compiler-rt/test/msan/strlen_of_shadow.cc

   1 // RUN: %clangxx_msan -O0 %s -o %t && %run %t
   2
   3 // Check that strlen() and similar intercepted functions can be called on shadow
   4 // memory.
   5
   6 #include <assert.h>
   7 #include <stdint.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11 #include "test.h"
  12
  13 const char *mem_to_shadow(const char *p) {
  14 #if defined(__x86_64__)
  15   return (char *)((uintptr_t)p ^ 0x500000000000ULL);
  16 #elif defined (__mips64)
  17   return (char *)((uintptr_t)p & ~0x4000000000ULL);
  18 #elif defined(__powerpc64__)
  19 #define LINEARIZE_MEM(mem) \
  20   (((uintptr_t)(mem) & ~0x200000000000ULL) ^ 0x100000000000ULL)
  21   return (char *)(LINEARIZE_MEM(p) + 0x080000000000ULL);
  22 #elif defined(__aarch64__)
  23   return (char *)((uintptr_t)p ^ 0x6000000000ULL);
  24 #endif
  25 }
  26
  27 int main(void) {
  28   const char *s = "abcdef";
  29   assert(strlen(s) == 6);
  30   assert(strlen(mem_to_shadow(s)) == 0);
  31
  32   char *t = new char[42];
  33   t[41] = 0;
  34   assert(strlen(mem_to_shadow(t)) == 41);
  35   return 0;
  36 }