| 1 | // Make sure we do not segfault when checking an address close to kLowMemEnd. |
|---|---|
| 2 | // RUN: %clang_hwasan %s -o %t |
| 3 | // RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK |
| 4 | |
| 5 | // REQUIRES: aarch64-target-arch || riscv64-target-arch |
| 6 | |
| 7 | #include <sanitizer/hwasan_interface.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <sys/auxv.h> |
| 11 | #include <sys/mman.h> |
| 12 | |
| 13 | static volatile char sink; |
| 14 | extern void *__hwasan_shadow_memory_dynamic_address; |
| 15 | |
| 16 | int main(int argc, char **argv) { |
| 17 | size_t page_size = getauxval(AT_PAGESZ); |
| 18 | void *high_addr = (char *)__hwasan_shadow_memory_dynamic_address - page_size; |
| 19 | void *r = mmap(addr: high_addr, len: page_size, PROT_READ, |
| 20 | MAP_FIXED | MAP_ANON | MAP_PRIVATE, fd: -1, offset: 0); |
| 21 | if (r == MAP_FAILED) { |
| 22 | fprintf(stderr, format: "Failed to mmap\n"); |
| 23 | abort(); |
| 24 | } |
| 25 | volatile char *x = (char *)__hwasan_tag_pointer(p: r, tag: 4); |
| 26 | sink = *x; |
| 27 | } |
| 28 | |
| 29 | // CHECK-NOT: Failed to mmap |
| 30 | // CHECK-NOT: Segmentation fault |
| 31 | // CHECK-NOT: SEGV |
| 32 |