mirror of
https://github.com/davea42/libdwarf-code.git
synced 2025-10-18 09:32:24 +08:00
128 lines
3.5 KiB
C
128 lines
3.5 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/types.h>
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#include <unistd.h>
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#ifndef O_BINARY
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#define O_BINARY 0 /* So it does nothing in Linux/Unix */
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#endif
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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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/*
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* Helper function definitions.
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*/
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static void cleanup_bad_arange(Dwarf_Debug dbg, Dwarf_Arange *arange,
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Dwarf_Signed i, Dwarf_Signed count);
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int arange_processing_example(Dwarf_Debug dbg, Dwarf_Error *error);
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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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Dwarf_Debug dbg = 0;
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int res = DW_DLV_ERROR;
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Dwarf_Error error = 0;
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Dwarf_Handler errhand = 0;
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Dwarf_Ptr errarg = 0;
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int fd = open(filename, O_RDONLY | O_BINARY);
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if (fd < 0) {
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exit(EXIT_FAILURE);
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}
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res = dwarf_init_b(fd, DW_GROUPNUMBER_ANY, errhand, errarg, &dbg, &error);
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if (res != DW_DLV_OK) {
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dwarf_dealloc_error(dbg, error);
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} else {
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/* Adding newline avoids a warning from diff
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in regressiontesting */
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printf("Processing\n");
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arange_processing_example(dbg, &error);
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}
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dwarf_finish(dbg);
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close(fd);
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unlink(filename);
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return 0;
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}
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static void cleanup_bad_arange(Dwarf_Debug dbg, Dwarf_Arange *arange,
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Dwarf_Signed i, Dwarf_Signed count) {
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Dwarf_Signed k = i;
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for (; k < count; ++k) {
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dwarf_dealloc(dbg, arange[k], DW_DLA_ARANGE);
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arange[k] = 0;
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}
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}
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// Source:
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// https://www.prevanders.net/libdwarfdoc/group__aranges.html#ga9b628e21a71f4280f93788815796ef92
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int arange_processing_example(Dwarf_Debug dbg, Dwarf_Error *error) {
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Dwarf_Signed count = 0;
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Dwarf_Arange *arange = 0;
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int res = 0;
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res = dwarf_get_aranges(dbg, &arange, &count, error);
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if (res == DW_DLV_OK) {
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Dwarf_Signed i = 0;
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for (i = 0; i < count; ++i) {
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Dwarf_Arange ara = arange[i];
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Dwarf_Unsigned segment = 0;
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Dwarf_Unsigned segment_entry_size = 0;
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Dwarf_Addr start = 0;
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Dwarf_Unsigned length = 0;
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Dwarf_Off cu_die_offset = 0;
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res = dwarf_get_arange_info_b(ara, &segment, &segment_entry_size, &start,
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&length, &cu_die_offset, error);
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if (res != DW_DLV_OK) {
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cleanup_bad_arange(dbg, arange, i, count);
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dwarf_dealloc(dbg, arange, DW_DLA_LIST);
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return res;
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}
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dwarf_dealloc(dbg, ara, DW_DLA_ARANGE);
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arange[i] = 0;
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}
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dwarf_dealloc(dbg, arange, DW_DLA_LIST);
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}
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return res;
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}
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