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-rw-r--r--src/fuzz/fuzz-udev-rules.c2
-rw-r--r--src/fuzz/fuzz-varlink.c131
-rw-r--r--src/fuzz/fuzz.h3
-rw-r--r--src/fuzz/fuzzer-entry-point.c5
-rw-r--r--src/fuzz/meson.build4
5 files changed, 144 insertions, 1 deletions
diff --git a/src/fuzz/fuzz-udev-rules.c b/src/fuzz/fuzz-udev-rules.c
index e894fa8d2d..18a34496ed 100644
--- a/src/fuzz/fuzz-udev-rules.c
+++ b/src/fuzz/fuzz-udev-rules.c
@@ -14,7 +14,7 @@
#include "rm-rf.h"
#include "string-util.h"
#include "tests.h"
-#include "udev.h"
+#include "udev-rules.h"
static struct fakefs {
const char *target;
diff --git a/src/fuzz/fuzz-varlink.c b/src/fuzz/fuzz-varlink.c
new file mode 100644
index 0000000000..31c13e2bea
--- /dev/null
+++ b/src/fuzz/fuzz-varlink.c
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <unistd.h>
+
+#include "errno-util.h"
+#include "fd-util.h"
+#include "fuzz.h"
+#include "hexdecoct.h"
+#include "io-util.h"
+#include "varlink.h"
+#include "log.h"
+
+static FILE *null = NULL;
+
+static int method_something(Varlink *v, JsonVariant *p, VarlinkMethodFlags flags, void *userdata) {
+ json_variant_dump(p, JSON_FORMAT_NEWLINE|JSON_FORMAT_PRETTY, null, NULL);
+ return 0;
+}
+
+static int reply_callback(Varlink *v, JsonVariant *p, const char *error_id, VarlinkReplyFlags flags, void *userdata) {
+ json_variant_dump(p, JSON_FORMAT_NEWLINE|JSON_FORMAT_PRETTY, null, NULL);
+ return 0;
+}
+
+static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ struct iovec *iov = userdata;
+ bool write_eof = false, read_eof = false;
+
+ assert(s);
+ assert(fd >= 0);
+ assert(iov);
+
+ if ((revents & (EPOLLOUT|EPOLLHUP|EPOLLERR)) && iov->iov_len > 0) {
+ ssize_t n;
+
+ /* never write more than 143 bytes a time, to make broken up recv()s on the other side more
+ * likely, and thus test some additional code paths. */
+ n = send(fd, iov->iov_base, MIN(iov->iov_len, 143U), MSG_NOSIGNAL|MSG_DONTWAIT);
+ if (n < 0) {
+ if (ERRNO_IS_DISCONNECT(errno))
+ write_eof = true;
+ else
+ assert_se(errno == EAGAIN);
+ } else
+ IOVEC_INCREMENT(iov, 1, n);
+ }
+
+ if (revents & EPOLLIN) {
+ char c[137];
+ ssize_t n;
+
+ n = recv(fd, c, sizeof(c), MSG_DONTWAIT);
+ if (n < 0) {
+ if (ERRNO_IS_DISCONNECT(errno))
+ read_eof = true;
+ else
+ assert_se(errno == EAGAIN);
+ } else if (n == 0)
+ read_eof = true;
+ else
+ hexdump(null, c, (size_t) n);
+ }
+
+ /* After we wrote everything we could turn off EPOLLOUT. And if we reached read EOF too turn off the
+ * whole thing. */
+ if (write_eof || iov->iov_len == 0) {
+
+ if (read_eof)
+ assert_se(sd_event_source_set_enabled(s, SD_EVENT_OFF) >= 0);
+ else
+ assert_se(sd_event_source_set_io_events(s, EPOLLIN) >= 0);
+ }
+
+ return 0;
+}
+
+static int idle_callback(sd_event_source *s, void *userdata) {
+ assert(s);
+
+ /* Called as idle callback when there's nothing else to do anymore */
+ sd_event_exit(sd_event_source_get_event(s), 0);
+ return 0;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+ struct iovec server_iov = IOVEC_MAKE((void*) data, size), client_iov = IOVEC_MAKE((void*) data, size);
+ /* Important: the declaration order matters here! we want that the fds are closed on return after the
+ * event sources, hence we declare the fds first, the event sources second */
+ _cleanup_close_pair_ int server_pair[2] = { -1, -1 }, client_pair[2] = { -1, -1 };
+ _cleanup_(sd_event_source_unrefp) sd_event_source *idle_event_source = NULL,
+ *server_event_source = NULL, *client_event_source = NULL;
+ _cleanup_(varlink_server_unrefp) VarlinkServer *s = NULL;
+ _cleanup_(varlink_flush_close_unrefp) Varlink *c = NULL;
+ _cleanup_(sd_event_unrefp) sd_event *e = NULL;
+
+ log_set_max_level(LOG_CRIT);
+ log_parse_environment();
+
+ assert_se(null = fopen("/dev/null", "we"));
+
+ assert_se(sd_event_default(&e) >= 0);
+
+ /* Test one: write the data as method call to a server */
+ assert_se(socketpair(AF_UNIX, SOCK_STREAM, 0, server_pair) >= 0);
+ assert_se(varlink_server_new(&s, 0) >= 0);
+ assert_se(varlink_server_set_description(s, "myserver") >= 0);
+ assert_se(varlink_server_attach_event(s, e, 0) >= 0);
+ assert_se(varlink_server_add_connection(s, server_pair[0], NULL) >= 0);
+ TAKE_FD(server_pair[0]);
+ assert_se(varlink_server_bind_method(s, "io.test.DoSomething", method_something) >= 0);
+ assert_se(sd_event_add_io(e, &server_event_source, server_pair[1], EPOLLIN|EPOLLOUT, io_callback, &server_iov) >= 0);
+
+ /* Test two: write the data as method response to a client */
+ assert_se(socketpair(AF_UNIX, SOCK_STREAM, 0, client_pair) >= 0);
+ assert_se(varlink_connect_fd(&c, client_pair[0]) >= 0);
+ TAKE_FD(client_pair[0]);
+ assert_se(varlink_set_description(c, "myclient") >= 0);
+ assert_se(varlink_attach_event(c, e, 0) >= 0);
+ assert_se(varlink_bind_reply(c, reply_callback) >= 0);
+ assert_se(varlink_invoke(c, "io.test.DoSomething", NULL) >= 0);
+ assert_se(sd_event_add_io(e, &client_event_source, client_pair[1], EPOLLIN|EPOLLOUT, io_callback, &client_iov) >= 0);
+
+ assert_se(sd_event_add_defer(e, &idle_event_source, idle_callback, NULL) >= 0);
+ assert_se(sd_event_source_set_priority(idle_event_source, SD_EVENT_PRIORITY_IDLE) >= 0);
+
+ assert_se(sd_event_loop(e) >= 0);
+
+ null = safe_fclose(null);
+
+ return 0;
+}
diff --git a/src/fuzz/fuzz.h b/src/fuzz/fuzz.h
index 1e56526259..83b1ac11ad 100644
--- a/src/fuzz/fuzz.h
+++ b/src/fuzz/fuzz.h
@@ -6,3 +6,6 @@
/* The entry point into the fuzzer */
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
+
+/* https://docs.fuzzbuzz.io/developer-documentation/porting-targets-to-fuzzbuzz/libfuzzer-targets */
+int FuzzerEntrypoint(const uint8_t *data, size_t size);
diff --git a/src/fuzz/fuzzer-entry-point.c b/src/fuzz/fuzzer-entry-point.c
new file mode 100644
index 0000000000..020c111650
--- /dev/null
+++ b/src/fuzz/fuzzer-entry-point.c
@@ -0,0 +1,5 @@
+#include "fuzz.h"
+
+int FuzzerEntrypoint(const uint8_t *data, size_t size) {
+ return LLVMFuzzerTestOneInput(data, size);
+}
diff --git a/src/fuzz/meson.build b/src/fuzz/meson.build
index a6c6db372b..c88812d1de 100644
--- a/src/fuzz/meson.build
+++ b/src/fuzz/meson.build
@@ -51,6 +51,10 @@ fuzzers += [
[libshared],
[]],
+ [['src/fuzz/fuzz-varlink.c'],
+ [libshared],
+ []],
+
[['src/fuzz/fuzz-unit-file.c'],
[libcore,
libshared],
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 06:54:38 +0000