1/* $NetBSD: truncated_string.c,v 1.1.1.1 2019/12/22 12:34:06 skrll Exp $ */ 2 3// SPDX-License-Identifier: LGPL-2.1-or-later 4/* 5 * libfdt - Flat Device Tree manipulation 6 * Testcase for misbehaviour on a truncated string 7 * Copyright (C) 2018 David Gibson, IBM Corporation. 8 */ 9 10#include <stdlib.h> 11#include <stdio.h> 12#include <string.h> 13#include <stdint.h> 14 15#include <libfdt.h> 16 17#include "tests.h" 18#include "testdata.h" 19 20int main(int argc, char *argv[]) 21{ 22 void *fdt = &truncated_string; 23 const struct fdt_property *good, *bad; 24 int off, len; 25 const char *name; 26 27 test_init(argc, argv); 28 29 vg_prepare_blob(fdt, fdt_totalsize(fdt)); 30 31 off = fdt_first_property_offset(fdt, 0); 32 good = fdt_get_property_by_offset(fdt, off, NULL); 33 34 off = fdt_next_property_offset(fdt, off); 35 bad = fdt_get_property_by_offset(fdt, off, NULL); 36 37 if (fdt32_to_cpu(good->len) != 0) 38 FAIL("Unexpected length for good property"); 39 name = fdt_get_string(fdt, fdt32_to_cpu(good->nameoff), &len); 40 if (!name) 41 FAIL("fdt_get_string() failed on good property: %s", 42 fdt_strerror(len)); 43 if (len != 4) 44 FAIL("fdt_get_string() returned length %d (not 4) on good property", 45 len); 46 if (!streq(name, "good")) 47 FAIL("fdt_get_string() returned \"%s\" (not \"good\") on good property", 48 name); 49 50 if (fdt32_to_cpu(bad->len) != 0) 51 FAIL("Unexpected length for bad property\n"); 52 name = fdt_get_string(fdt, fdt32_to_cpu(bad->nameoff), &len); 53 if (name) 54 FAIL("fdt_get_string() succeeded incorrectly on bad property"); 55 else if (len != -FDT_ERR_TRUNCATED) 56 FAIL("fdt_get_string() gave unexpected error on bad property: %s", 57 fdt_strerror(len)); 58 59 /* Make sure the 'good' property breaks correctly if we 60 * truncate the strings section */ 61 fdt_set_size_dt_strings(fdt, fdt32_to_cpu(good->nameoff) + 4); 62 name = fdt_get_string(fdt, fdt32_to_cpu(good->nameoff), &len); 63 if (name) 64 FAIL("fdt_get_string() succeeded incorrectly on mangled property"); 65 else if (len != -FDT_ERR_TRUNCATED) 66 FAIL("fdt_get_string() gave unexpected error on mangled property: %s", 67 fdt_strerror(len)); 68 69 PASS(); 70} 71