mirror of
https://github.com/davea42/libdwarf-code.git
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550d3570b2
of the temp file to start with junk
to better match what is routine in the regressiontests.
And to something that works just fine with Win msys2.
(in msys2 "/tmp/anything" will not work for open( "wb")
whereas "anything" will work.)
modified: fuzz/fuzz_aranges.c
modified: fuzz/fuzz_crc.c
modified: fuzz/fuzz_crc_32.c
modified: fuzz/fuzz_debug_addr_access.c
modified: fuzz/fuzz_debug_str.c
modified: fuzz/fuzz_debuglink.c
modified: fuzz/fuzz_die_cu.c
modified: fuzz/fuzz_die_cu_attrs.c
modified: fuzz/fuzz_die_cu_attrs_loclist.c
modified: fuzz/fuzz_die_cu_e.c
modified: fuzz/fuzz_die_cu_e_print.c
modified: fuzz/fuzz_die_cu_info1.c
modified: fuzz/fuzz_die_cu_offset.c
modified: fuzz/fuzz_die_cu_print.c
modified: fuzz/fuzz_dnames.c
modified: fuzz/fuzz_findfuncbypc.c
modified: fuzz/fuzz_gdbindex.c
modified: fuzz/fuzz_globals.c
modified: fuzz/fuzz_gnu_index.c
modified: fuzz/fuzz_init_b.c
modified: fuzz/fuzz_init_binary.c
modified: fuzz/fuzz_init_path.c
modified: fuzz/fuzz_macro_dwarf4.c
modified: fuzz/fuzz_macro_dwarf5.c
modified: fuzz/fuzz_rng.c
modified: fuzz/fuzz_set_frame_all.c
modified: fuzz/fuzz_showsectgrp.c
modified: fuzz/fuzz_simplereader_tu.c
modified: fuzz/fuzz_srcfiles.c
modified: fuzz/fuzz_stack_frame_access.c
modified: fuzz/fuzz_str_offsets.c
modified: fuzz/fuzz_tie.c
modified: fuzz/fuzz_xuindex.c
modified: src/lib/libdwarf/libdwarf.h
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/* Copyright 2021 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <fcntl.h> /* open() O_RDONLY O_BINARY */
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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/*
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* Libdwarf library callers can only use these headers.
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*/
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#include "dwarf.h"
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#include "libdwarf.h"
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/*
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* Fuzzer function
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*/
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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char filename[256];
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#ifdef DWREGRESSIONTEMP
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/* Under msys2, the /tmp/ results in an open fail */
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sprintf(filename, "junklibfuzzer.%d", getpid());
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#else
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sprintf(filename, "/tmp/libfuzzer.%d", getpid());
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#endif
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FILE *fp = fopen(filename, "wb");
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if (!fp) {
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printf("FAIL libfuzzer cannot open temp as writeable %s\n",
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filename);
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return 0;
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}
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fwrite(data, size, 1, fp);
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fclose(fp);
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int fuzz_fd = 0;
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Dwarf_Ptr errarg = 0;
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Dwarf_Handler errhand = 0;
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Dwarf_Error *errp = NULL;
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Dwarf_Debug dbg = 0;
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off_t size_left = 0;
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off_t fsize = 0;
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ssize_t readlen = 1000;
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ssize_t readval = 0;
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unsigned char *readbuf = 0;
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unsigned int tcrc = 0;
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unsigned int init = 0;
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fuzz_fd = open(filename, O_RDONLY | O_BINARY);
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fsize = size_left = lseek(fuzz_fd, 0L, SEEK_END);
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readbuf = (unsigned char *)malloc(readlen);
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/* The read below will fail, so to avoid
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reading uninitialized data we ensure
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the data is initialized. */
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memset((void *)readbuf,10,(size_t)readlen);
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if (fuzz_fd != -1) {
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while (size_left > 0) {
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if (size_left < readlen) {
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readlen = size_left;
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}
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readval = read(fuzz_fd, readbuf, readlen);
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if (readval != readlen) {
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/* The read failed as it is expected to. */
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}
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size_left -= readlen;
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tcrc = dwarf_basic_crc32(readbuf, readlen, init);
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init = tcrc;
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}
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}
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free(readbuf);
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close(fuzz_fd);
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unlink(filename);
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return 0;
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}
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