| // RUN: %clang_scudo %s -o %t |
| // RUN: %run %t after 2>&1 | FileCheck %s |
| // RUN: %run %t before 2>&1 | FileCheck %s |
| |
| // Test that we hit a guard page when writing past the end of a chunk |
| // allocated by the Secondary allocator, or writing too far in front of it. |
| |
| #include <assert.h> |
| #include <malloc.h> |
| #include <signal.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| void handler(int signo, siginfo_t *info, void *uctx) { |
| if (info->si_code == SEGV_ACCERR) { |
| fprintf(stderr, "SCUDO SIGSEGV\n"); |
| exit(0); |
| } |
| exit(1); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| // The size must be large enough to be serviced by the secondary allocator. |
| long page_size = sysconf(_SC_PAGESIZE); |
| size_t size = (1U << 17) + page_size; |
| struct sigaction a; |
| |
| assert(argc == 2); |
| memset(&a, 0, sizeof(a)); |
| a.sa_sigaction = handler; |
| a.sa_flags = SA_SIGINFO; |
| |
| char *p = (char *)malloc(size); |
| assert(p); |
| memset(p, 'A', size); // This should not trigger anything. |
| // Set up the SIGSEGV handler now, as the rest should trigger an AV. |
| sigaction(SIGSEGV, &a, NULL); |
| if (!strcmp(argv[1], "after")) { |
| for (int i = 0; i < page_size; i++) |
| p[size + i] = 'A'; |
| } |
| if (!strcmp(argv[1], "before")) { |
| for (int i = 1; i < page_size; i++) |
| p[-i] = 'A'; |
| } |
| free(p); |
| |
| return 1; // A successful test means we shouldn't reach this. |
| } |
| |
| // CHECK: SCUDO SIGSEGV |