| // Test that use-after-return works with arguments passed by value. |
| // RUN: %clangxx_asan -O0 %s -o %t |
| // RUN: %env_asan_opts=detect_stack_use_after_return=0 %run %t 2>&1 | \ |
| // RUN: FileCheck --check-prefix=CHECK-NO-UAR %s |
| // RUN: not %env_asan_opts=detect_stack_use_after_return=1 %run %t 2>&1 | \ |
| // RUN: FileCheck --check-prefix=CHECK-UAR %s |
| // |
| // On several architectures, the IR does not use byval arguments for foo() and |
| // instead creates a copy in main() and gives foo() a pointer to the copy. In |
| // that case, ASAN has nothing to poison on return from foo() and will not |
| // detect the UAR. |
| // REQUIRES: x86_64-target-arch, linux, !android |
| |
| #include <cstdio> |
| |
| struct A { |
| int a[8]; |
| }; |
| |
| A *foo(A a) { |
| return &a; |
| } |
| |
| int main() { |
| A *a = foo(A()); |
| a->a[0] = 7; |
| std::fprintf(stderr, "\n"); // Ensures some output is generated for FileCheck |
| // to verify in the case where UAR is not |
| // detected. |
| } |
| |
| // CHECK-NO-UAR-NOT: ERROR: AddressSanitizer: stack-use-after-return |
| // CHECK-NO-UAR-NOT: WRITE of size 4 at |
| // CHECK-NO-UAR-NOT: Memory access at offset {{[0-9]+}} is inside this variable |
| // |
| // CHECK-UAR: ERROR: AddressSanitizer: stack-use-after-return |
| // CHECK-UAR: WRITE of size 4 at |
| // CHECK-UAR: Memory access at offset {{[0-9]+}} is inside this variable |
