| diff -Nur ORIG.bind-9.15.4/bin/named/fuzz.c bind-9.15.4/bin/named/fuzz.c |
| --- ORIG.bind-9.15.4/bin/named/fuzz.c 2019-09-09 16:52:45.000000000 +0200 |
| +++ bind-9.15.4/bin/named/fuzz.c 2019-10-09 14:52:41.025018879 +0200 |
| @@ -736,7 +736,7 @@ |
| */ |
| void |
| named_fuzz_notify(void) { |
| -#ifdef ENABLE_AFL |
| +#if 0 |
| if (getenv("AFL_CMIN")) { |
| named_server_flushonshutdown(named_g_server, false); |
| isc_app_shutdown(); |
| diff -Nur ORIG.bind-9.15.4/bin/named/main.c bind-9.15.4/bin/named/main.c |
| --- ORIG.bind-9.15.4/bin/named/main.c 2019-09-09 16:52:45.000000000 +0200 |
| +++ bind-9.15.4/bin/named/main.c 2019-10-09 14:52:21.993025966 +0200 |
| @@ -1385,11 +1385,285 @@ |
| } |
| #endif /* HAVE_LIBSCF */ |
| |
| +#include <named/globals.h> |
| + |
| +#include <arpa/inet.h> |
| +#include <errno.h> |
| +#include <fcntl.h> |
| +#include <net/if.h> |
| +#include <net/route.h> |
| +#include <netinet/ip6.h> |
| +#include <netinet/tcp.h> |
| +#include <pthread.h> |
| +#include <sched.h> |
| +#include <sys/ioctl.h> |
| +#include <sys/resource.h> |
| +#include <sys/socket.h> |
| +#include <sys/stat.h> |
| +#include <sys/time.h> |
| +#include <sys/types.h> |
| +#include <sys/uio.h> |
| +#include <sys/wait.h> |
| +#include <unistd.h> |
| + |
| +#include <libhfcommon/util.h> |
| +#include <libhfuzz/libhfuzz.h> |
| + |
| +static void enter_namespaces(void) |
| +{ |
| + if (linuxEnterNs(CLONE_NEWUSER | CLONE_NEWNET | CLONE_NEWNS | CLONE_NEWIPC) == false) { |
| + exit(1); |
| + } |
| + if (linuxIfaceUp("lo") == false) { |
| + exit(1); |
| + } |
| + if (linuxMountTmpfs("/tmp", "size=10000000") == false) { |
| + exit(1); |
| + } |
| +} |
| + |
| +static size_t rlen = 0; |
| +static const uint8_t* rbuf = NULL; |
| + |
| +__attribute__((no_sanitize("memory"))) |
| +__attribute__((no_sanitize("address"))) static void* |
| +bind_thr(void* unused __attribute__((unused))) |
| +{ |
| + while (!named_g_run_done) { |
| + usleep(300000); |
| + } |
| + |
| + int myfd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP); |
| + if (myfd == -1) { |
| + perror("socket"); |
| + exit(1); |
| + } |
| + int val = 1; |
| + if (setsockopt(myfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) == -1) { |
| + perror("setsockopt(SO_REUSEADDR)"); |
| + } |
| + |
| + const struct sockaddr_in saddr = { |
| + .sin_family = AF_INET, |
| + .sin_port = htons(5353), |
| + .sin_addr.s_addr = inet_addr("127.0.0.2"), |
| + }; |
| + if (bind(myfd, &saddr, sizeof(saddr)) == -1) { |
| + perror("bind"); |
| + exit(1); |
| + } |
| + |
| + if (listen(myfd, SOMAXCONN) == -1) { |
| + perror("listen"); |
| + exit(1); |
| + } |
| + |
| + for (;;) { |
| + struct sockaddr_in cli; |
| + socklen_t cli_len = sizeof(cli); |
| + |
| + int nfd = accept(myfd, &cli, &cli_len); |
| + if (nfd == -1) { |
| + perror("accept"); |
| + exit(1); |
| + } |
| + |
| + static char b[1024 * 1024]; |
| + ssize_t sz = recv(nfd, b, sizeof(b), 0); |
| + if (sz <= 0) { |
| + perror("recv"); |
| + _exit(1); |
| + } |
| + if (sz < 4) { |
| + close(nfd); |
| + continue; |
| + } |
| + if (rlen < 1) { |
| + close(nfd); |
| + continue; |
| + } |
| + |
| + /* It's a response, so set QR bit to 1 */ |
| + uint8_t qr = rbuf[0] | 0x80; |
| + |
| + uint16_t t_l = htons(rlen + 2); |
| + const struct iovec iov[] = { |
| + { |
| + .iov_base = &t_l, |
| + .iov_len = sizeof(t_l), |
| + }, |
| + { |
| + .iov_base = &b[2], |
| + .iov_len = 2, |
| + }, |
| + { |
| + .iov_base = &qr, |
| + .iov_len = 1, |
| + }, |
| + { |
| + .iov_base = (void*)&rbuf[1], |
| + .iov_len = rlen - 1, |
| + }, |
| + }; |
| + |
| + if (writev(nfd, iov, 4) == -1) { |
| + perror("writev() failed"); |
| + } |
| + |
| + close(nfd); |
| + } |
| + |
| + return NULL; |
| +} |
| + |
| +static void rndloop(int sock) |
| +{ |
| + const struct sockaddr_in bsaddr = { |
| + .sin_family = AF_INET, |
| + .sin_port = htons(0), |
| + .sin_addr.s_addr = htonl((((uint32_t)util_rnd64()) & 0x00FFFFFF) | 0x7F000000), |
| + }; |
| + if (bind(sock, (const struct sockaddr*)&bsaddr, sizeof(bsaddr)) == -1) { |
| + perror("bind"); |
| + } |
| +} |
| + |
| +__attribute__((no_sanitize("memory"))) |
| +__attribute__((no_sanitize("address"))) static void* |
| +connect_thr(void* unused __attribute__((unused))) |
| +{ |
| + while (!named_g_run_done) { |
| + usleep(300000); |
| + } |
| + |
| + for (;;) { |
| + int myfd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP); |
| + if (myfd == -1) { |
| + perror("socket"); |
| + exit(1); |
| + } |
| + int val = 1; |
| + if (setsockopt(myfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) == -1) { |
| + perror("setsockopt(SO_REUSEADDR)"); |
| + } |
| + |
| + rndloop(myfd); |
| + |
| + const struct sockaddr_in saddr = { |
| + .sin_family = AF_INET, |
| + .sin_port = htons(53), |
| + .sin_addr.s_addr = htonl(INADDR_LOOPBACK), |
| + }; |
| + if (connect(myfd, &saddr, sizeof(saddr)) == -1) { |
| + close(myfd); |
| + continue; |
| + } |
| + |
| + const uint8_t* buf; |
| + size_t len; |
| + |
| + if (named_g_fuzz_type == isc_fuzz_client) { |
| + HF_ITER(&buf, &len); |
| + |
| + rlen = 0; |
| + rbuf = NULL; |
| + |
| + if (len < 32) { |
| + close(myfd); |
| + continue; |
| + } |
| + |
| + uint32_t tmplen = *((const uint32_t*)buf); |
| + |
| + buf = &buf[sizeof(uint32_t)]; |
| + len -= sizeof(uint32_t); |
| + |
| + tmplen %= len; |
| + |
| + rbuf = &buf[tmplen]; |
| + rlen = len - tmplen; |
| + len = tmplen; |
| + } else { |
| + static const uint8_t qbuf[] = { |
| + 0x88, 0x0c, 0x01, 0x20, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, |
| + 0x00, 0x01, 0x0a, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, |
| + 0x61, 0x61, 0x61, 0x07, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, |
| + 0x65, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x29, 0x10, |
| + 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00 |
| + }; |
| + buf = qbuf; |
| + len = sizeof(qbuf); |
| + HF_ITER(&rbuf, &rlen); |
| + } |
| + |
| + uint16_t t_l = htons(len); |
| + const struct iovec iov[] = { |
| + { |
| + .iov_base = &t_l, |
| + .iov_len = sizeof(t_l), |
| + }, |
| + { |
| + .iov_base = (void*)buf, |
| + .iov_len = len, |
| + }, |
| + }; |
| + |
| + if (writev(myfd, iov, 2) == -1) { |
| + perror("write"); |
| + close(myfd); |
| + continue; |
| + } |
| + |
| + if (shutdown(myfd, SHUT_WR) == -1) { |
| + if (errno == ENOTCONN) { |
| + close(myfd); |
| + continue; |
| + } |
| + perror("shutdown"); |
| + _exit(1); |
| + } |
| + |
| + uint8_t b[1024 * 512]; |
| + while (recv(myfd, b, sizeof(b), 0) > 0) |
| + ; |
| + close(myfd); |
| + } |
| +} |
| + |
| +static void launch_thr(void) |
| +{ |
| + pthread_attr_t attr; |
| + pthread_attr_init(&attr); |
| + pthread_attr_setstacksize(&attr, 1024 * 1024 * 4); |
| + pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| + |
| + pthread_t t; |
| + if (pthread_create(&t, &attr, bind_thr, NULL) < 0) { |
| + perror("pthread_create(bind_thr)"); |
| + exit(1); |
| + } |
| + |
| + pthread_attr_init(&attr); |
| + pthread_attr_setstacksize(&attr, 1024 * 1024 * 4); |
| + pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| + if (pthread_create(&t, &attr, connect_thr, NULL) < 0) { |
| + perror("pthread_create(connect_thr)"); |
| + exit(1); |
| + } |
| +} |
| + |
| /* main entry point, possibly hooked */ |
| |
| -int |
| -main(int argc, char *argv[]) { |
| - isc_result_t result; |
| +int main(int argc, char* argv[]) |
| +{ |
| + if (!getenv("NO_FUZZ")) { |
| + named_g_fuzz_addr = "127.0.0.1:53"; |
| + named_g_fuzz_type = isc_fuzz_client; |
| + enter_namespaces(); |
| + launch_thr(); |
| + } |
| + |
| + isc_result_t result; |
| #ifdef HAVE_LIBSCF |
| char *instance = NULL; |
| #endif |
| diff -Nur ORIG.bind-9.15.4/compile.sh bind-9.15.4/compile.sh |
| --- ORIG.bind-9.15.4/compile.sh 1970-01-01 01:00:00.000000000 +0100 |
| +++ bind-9.15.4/compile.sh 2019-10-09 14:52:21.993025966 +0200 |
| @@ -0,0 +1,20 @@ |
| +#!/bin/sh |
| + |
| +set -ex |
| + |
| +export CC="$HOME"/src/honggfuzz/hfuzz_cc/hfuzz-clang |
| +export CXX="$HOME"/src/honggfuzz/hfuzz_cc/hfuzz-clang++ |
| +export CFLAGS="-fsanitize=address -Wno-shift-negative-value -Wno-logical-not-parentheses -g -ggdb -O0 -D__AFL_COMPILER" |
| +./configure \ |
| + --prefix="$HOME"/fuzz/bind/dist/ \ |
| + --without-gssapi \ |
| + --disable-chroot \ |
| + --disable-linux-caps \ |
| + --without-libtool \ |
| + --enable-epoll \ |
| + --enable-fuzzing=afl \ |
| + --disable-backtrace \ |
| + --with-openssl=yes |
| + |
| +make clean |
| +make -j$(nproc) |
| diff -Nur ORIG.bind-9.15.4/lib/dns/request.c bind-9.15.4/lib/dns/request.c |
| --- ORIG.bind-9.15.4/lib/dns/request.c 2019-09-09 16:52:45.000000000 +0200 |
| +++ bind-9.15.4/lib/dns/request.c 2019-10-09 14:52:21.997025964 +0200 |
| @@ -747,7 +747,7 @@ |
| goto cleanup; |
| } |
| |
| - if ((options & DNS_REQUESTOPT_TCP) != 0 || r.length > 512) |
| + if ((options & DNS_REQUESTOPT_TCP) != 0 || r.length >= 0) |
| tcp = true; |
| share = (options & DNS_REQUESTOPT_SHARE); |
| |
| @@ -1033,6 +1033,8 @@ |
| dns_compress_t cctx; |
| bool cleanup_cctx = false; |
| |
| + options |= DNS_REQUESTOPT_TCP; |
| + |
| REQUIRE(bufferp != NULL && *bufferp == NULL); |
| |
| req_log(ISC_LOG_DEBUG(3), "request_render"); |
| diff -Nur ORIG.bind-9.15.4/lib/dns/resolver.c bind-9.15.4/lib/dns/resolver.c |
| --- ORIG.bind-9.15.4/lib/dns/resolver.c 2019-09-09 16:52:45.000000000 +0200 |
| +++ bind-9.15.4/lib/dns/resolver.c 2019-10-09 14:52:22.001025962 +0200 |
| @@ -1946,7 +1946,7 @@ |
| |
| query = isc_mem_get(fctx->mctx, sizeof(*query)); |
| query->mctx = fctx->mctx; |
| - query->options = options; |
| + query->options = options | DNS_FETCHOPT_TCP; |
| query->attributes = 0; |
| query->sends = 0; |
| query->connects = 0; |
| diff -Nur ORIG.bind-9.15.4/lib/isc/random.c bind-9.15.4/lib/isc/random.c |
| --- ORIG.bind-9.15.4/lib/isc/random.c 2019-09-09 16:52:45.000000000 +0200 |
| +++ bind-9.15.4/lib/isc/random.c 2019-10-09 14:52:22.001025962 +0200 |
| @@ -94,6 +94,7 @@ |
| isc_random8(void) { |
| RUNTIME_CHECK(isc_once_do(&isc_random_once, |
| isc_random_initialize) == ISC_R_SUCCESS); |
| + return 1; |
| return (next() & 0xff); |
| } |
| |
| @@ -101,6 +102,7 @@ |
| isc_random16(void) { |
| RUNTIME_CHECK(isc_once_do(&isc_random_once, |
| isc_random_initialize) == ISC_R_SUCCESS); |
| + return 1; |
| return (next() & 0xffff); |
| } |
| |
| @@ -108,6 +110,7 @@ |
| isc_random32(void) { |
| RUNTIME_CHECK(isc_once_do(&isc_random_once, |
| isc_random_initialize) == ISC_R_SUCCESS); |
| + return 1; |
| return (next()); |
| } |
| |
| @@ -122,6 +125,13 @@ |
| RUNTIME_CHECK(isc_once_do(&isc_random_once, |
| isc_random_initialize) == ISC_R_SUCCESS); |
| |
| + for (size_t z = 0; z < buflen; z++) { |
| + char * b = (char*)buf; |
| + b[z] = z + 1; |
| + } |
| + return; |
| + |
| + |
| for (i = 0; i + sizeof(r) <= buflen; i += sizeof(r)) { |
| r = next(); |
| memmove((uint8_t *)buf + i, &r, sizeof(r)); |
