1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2024 Bill Sommerfeld <sommerfeld@hamachi.org> 14 */ 15 16 /* 17 * Regression test for illumos bug #16352: verify that strftime behaves 18 * properly if the buffer length is overly large. 19 */ 20 21 #include <limits.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 #include <time.h> 26 27 static int status = EXIT_SUCCESS; 28 29 static const char expected_buf[] = "2024 04 23"; 30 static int expected_ret = 10; 31 32 static void 33 check_results(const char *name, int ret, const char *buf) 34 { 35 if (ret == 0) { 36 fprintf(stderr, "TEST FAILED: %s returned 0\n", name); 37 status = EXIT_FAILURE; 38 } 39 40 if (ret != 10) { 41 fprintf(stderr, "TEST FAILED: %s length %d (expected %d)\n", 42 name, ret, expected_ret); 43 status = EXIT_FAILURE; 44 } 45 46 if (strcmp(buf, expected_buf) != 0) { 47 fprintf(stderr, "TEST FAILED: %s contents [%s]" 48 " (expected [%s])\n", name, buf, expected_buf); 49 status = EXIT_FAILURE; 50 } 51 } 52 53 int 54 main(void) 55 { 56 int ret; 57 struct tm t; 58 char buf[1024]; 59 60 memset(&t, 0, sizeof (t)); 61 t.tm_year = 124; 62 t.tm_mon = 3; 63 t.tm_mday = 23; 64 65 /* 66 * Test that ascftime() behaves properly; ascftime calls 67 * strftime(buf, LONG_MAX, format, t). For an unfixed libc, 68 * this will fail if buf lies above the midpoint of the 69 * process address space, as the computation of buf + len 70 * overflows and wraps around. 71 */ 72 ret = ascftime(buf, "%Y %m %d", &t); 73 check_results("ascftime", ret, buf); 74 75 /* 76 * Repeat test with strftime passed the maximum possible length. 77 * This will wrap around as long as buf is not NULL, letting us 78 * exercise the fix even if the user address space is restricted 79 * in some way. 80 */ 81 ret = strftime(buf, ULONG_MAX, "%Y %m %d", &t); 82 check_results("strftime", ret, buf); 83 84 if (status == EXIT_SUCCESS) { 85 (void) printf("TEST PASSED: observed expected output\n"); 86 } 87 printf("NOTE: buffer is %p\n", buf); 88 return (status); 89 } 90