[lxc] move the build script and fuzz target upstream (#5514)

Now that https://github.com/lxc/lxc/pull/3733 is merged, it should be
safe to point OSS-Fuzz to the lxc repository.

projects/lxc/Dockerfile

@@ -19,4 +19,4 @@ RUN apt-get update && \
     apt-get install -y pkgconf make libtool automake autoconf
 RUN git clone --depth 1 https://github.com/lxc/lxc
 WORKDIR lxc
-COPY build.sh *.c $SRC/
+COPY build.sh $SRC/

projects/lxc/build.sh

@@ -14,30 +14,4 @@
 # limitations under the License.
 #
 ################################################################################
-
-# -fsanitize=... isn't compatible with -Wl,-no-undefined
-# https://github.com/google/sanitizers/issues/380
-sed -i 's/-Wl,-no-undefined *\\/\\/' src/lxc/Makefile.am
-
-# AFL++ and hoggfuzz are both incompatible with lto=thin apparently
-sed -i '/-flto=thin/d' configure.ac
-
-# turn off the libutil dependency
-sed -i 's/^AC_CHECK_LIB(util/#/' configure.ac
-
-./autogen.sh
-./configure \
-    --disable-tools \
-    --disable-commands \
-    --disable-apparmor \
-    --disable-openssl \
-    --disable-selinux \
-    --disable-seccomp \
-    --disable-capabilities
-
-make -j$(nproc)
-
-$CC -c -o fuzz-lxc-config-read.o $CFLAGS -Isrc -Isrc/lxc $SRC/fuzz-lxc-config-read.c
-$CXX $CXXFLAGS $LIB_FUZZING_ENGINE fuzz-lxc-config-read.o src/lxc/.libs/liblxc.a -o $OUT/fuzz-lxc-config-read
-
-zip -r $OUT/fuzz-lxc-config-read_seed_corpus.zip doc/examples
+src/tests/oss-fuzz.sh

projects/lxc/fuzz-lxc-config-read.c

@@ -1,41 +0,0 @@
-/*
-# Copyright 2021 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-################################################################################
-*/
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include "conf.h"
-#include "confile.h"
-#include "utils.h"
-
-int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-	int fd = -1;
-	char tmpf[] = "fuzz-lxc-config-read-XXXXXX";
-	struct lxc_conf *conf = NULL;
-
-	fd = lxc_make_tmpfile(tmpf, false);
-	lxc_write_nointr(fd, data, size);
-	close(fd);
-
-	conf = lxc_conf_init();
-	lxc_config_read(tmpf, conf, false);
-	lxc_conf_free(conf);
-
-	(void) unlink(tmpf);
-	return 0;
-}