File: wrong_downcast_on_stack.cpp

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (26 lines) | stat: -rw-r--r-- 732 bytes parent folder | download | duplicates (10) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
 
// RUN: %clang_cl_asan -Od %s -Fe%t
// RUN: not %run %t 2>&1 | FileCheck %s

class Parent {
 public:
  int field;
};

class Child : public Parent {
 public:
  int extra_field;
};

int main(void) {
  Parent p;
  Child *c = (Child*)&p;  // Intentional error here!
  c->extra_field = 42;
// CHECK: AddressSanitizer: stack-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
// CHECK: WRITE of size 4 at [[ADDR]] thread T0
// CHECK-NEXT:  {{#0 0x[0-9a-f]* in main .*wrong_downcast_on_stack.cpp}}:[[@LINE-3]]
// CHECK: [[ADDR]] is located in stack of thread T0 at offset [[OFFSET:[0-9]+]] in frame
// CHECK-NEXT:  {{#0 0x[0-9a-f]* in main }}
// CHECK:  'p'{{.*}} <== Memory access at offset [[OFFSET]] overflows this variable
  return 0;
}