1 // Test fopencookie interceptor. 2 // RUN: %clangxx_msan -std=c++11 -O0 %s -o %t && %run %t 3 // RUN: %clangxx_msan -std=c++11 -fsanitize-memory-track-origins -O0 %s -o %t && %run %t 4 5 #include <assert.h> 6 #include <pthread.h> 7 #include <stdint.h> 8 #include <stdio.h> 9 #include <stdlib.h> 10 #include <string.h> 11 12 #include <sanitizer/msan_interface.h> 13 14 constexpr uintptr_t kMagicCookie = 0x12345678; 15 16 static ssize_t cookie_read(void *cookie, char *buf, size_t size) { 17 assert((uintptr_t)cookie == kMagicCookie); 18 memset(buf, 0, size); 19 return 0; 20 } 21 22 static ssize_t cookie_write(void *cookie, const char *buf, size_t size) { 23 assert((uintptr_t)cookie == kMagicCookie); 24 __msan_check_mem_is_initialized(buf, size); 25 return 0; 26 } 27 28 static int cookie_seek(void *cookie, off64_t *offset, int whence) { 29 assert((uintptr_t)cookie == kMagicCookie); 30 __msan_check_mem_is_initialized(offset, sizeof(*offset)); 31 return 0; 32 } 33 34 static int cookie_close(void *cookie) { 35 assert((uintptr_t)cookie == kMagicCookie); 36 return 0; 37 } 38 39 void PoisonStack() { char a[8192]; } 40 41 void TestPoisonStack() { 42 // Verify that PoisonStack has poisoned the stack - otherwise this test is not 43 // testing anything. 44 char a; 45 assert(__msan_test_shadow(&a - 1000, 1) == 0); 46 } 47 48 int main() { 49 void *cookie = (void *)kMagicCookie; 50 FILE *f = fopencookie(cookie, "rw", 51 {cookie_read, cookie_write, cookie_seek, cookie_close}); 52 PoisonStack(); 53 TestPoisonStack(); 54 fseek(f, 100, SEEK_SET); 55 char buf[50]; 56 fread(buf, 50, 1, f); 57 fwrite(buf, 50, 1, f); 58 fclose(f); 59 60 f = fopencookie(cookie, "rw", {nullptr, nullptr, nullptr, nullptr}); 61 fseek(f, 100, SEEK_SET); 62 fread(buf, 50, 1, f); 63 fwrite(buf, 50, 1, f); 64 fclose(f); 65 } 66
