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https://github.com/morgan9e/systemd
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7db7d5b733
The fuzzers will be used by oss-fuzz to automatically and continuously fuzz systemd. This commit includes the build tooling necessary to build fuzz targets, and a fuzzer for the DNS packet parser.
44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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Copyright 2018 Jonathan Rudenberg
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "fuzz.h"
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#include "resolved-dns-packet.h"
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
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int r;
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if (size > DNS_PACKET_SIZE_MAX)
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return 0;
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r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0, DNS_PACKET_SIZE_MAX);
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if (r < 0)
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return 0;
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p->size = 0; /* by default append starts after the header, undo that */
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dns_packet_append_blob(p, data, size, NULL);
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if (size < DNS_PACKET_HEADER_SIZE) {
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/* make sure we pad the packet back up to the minimum header size */
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assert(p->allocated >= DNS_PACKET_HEADER_SIZE);
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memzero(DNS_PACKET_DATA(p) + size, DNS_PACKET_HEADER_SIZE - size);
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p->size = DNS_PACKET_HEADER_SIZE;
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}
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dns_packet_extract(p);
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return 0;
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}
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