@@ -121,6 +121,65 @@ static void test_global_data_rdonly(struct bpf_object *obj, __u32 duration)
"err %d errno %d\n", err, errno);
}
+static void test_global_data_set_rdonly(__u32 duration)
+{
+ const char *file = "./test_global_data.o";
+ int err = -ENOMEM, map_fd, zero = 0;
+ __u8 *buff = NULL, *newval = NULL;
+ struct bpf_program *prog;
+ struct bpf_object *obj;
+ struct bpf_map *map;
+ size_t sz;
+
+ obj = bpf_object__open_file(file, NULL);
+ if (CHECK_FAIL(!obj))
+ return;
+ prog = bpf_program__next(NULL, obj);
+ if (CHECK_FAIL(!prog))
+ goto out;
+ err = bpf_program__set_sched_cls(prog);
+ if (CHECK_FAIL(err))
+ goto out;
+
+ map = bpf_object__find_map_by_name(obj, "test_glo.rodata");
+ if (CHECK_FAIL(!map || !bpf_map__is_internal(map)))
+ goto out;
+
+ sz = bpf_map__def(map)->value_size;
+ newval = malloc(sz);
+ if (CHECK_FAIL(!newval))
+ goto out;
+ memset(newval, 0, sz);
+
+ /* wrong size, should fail */
+ err = bpf_map__set_initial_value(map, newval, sz - 1);
+ if (CHECK(!err, "reject set initial value wrong size", "err %d\n", err))
+ goto out;
+
+ err = bpf_map__set_initial_value(map, newval, sz);
+ if (CHECK_FAIL(err))
+ goto out;
+
+ err = bpf_object__load(obj);
+ if (CHECK_FAIL(err))
+ goto out;
+
+ map_fd = bpf_map__fd(map);
+ if (CHECK_FAIL(map_fd < 0))
+ goto out;
+
+ buff = malloc(sz);
+ if (buff)
+ err = bpf_map_lookup_elem(map_fd, &zero, buff);
+ CHECK(!buff || err || memcmp(buff, newval, sz),
+ "compare .rodata map data override",
+ "err %d errno %d\n", err, errno);
+out:
+ free(buff);
+ free(newval);
+ bpf_object__close(obj);
+}
+
void test_global_data(void)
{
const char *file = "./test_global_data.o";
@@ -144,4 +203,6 @@ void test_global_data(void)
test_global_data_rdonly(obj, duration);
bpf_object__close(obj);
+
+ test_global_data_set_rdonly(duration);
}
This extends the global_data test to also exercise the new bpf_map__set_initial_value() function. The test simply overrides the global data section with all zeroes, and checks that the new value makes it into the kernel map on load. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> --- .../selftests/bpf/prog_tests/global_data.c | 61 +++++++++++++++++++ 1 file changed, 61 insertions(+)