aboutsummaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/bpf/progs/dynptr_success.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/testing/selftests/bpf/progs/dynptr_success.c')
-rw-r--r--tools/testing/selftests/bpf/progs/dynptr_success.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/dynptr_success.c b/tools/testing/selftests/bpf/progs/dynptr_success.c
new file mode 100644
index 000000000000..a3a6103c8569
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/dynptr_success.c
@@ -0,0 +1,164 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Facebook */
+
+#include <string.h>
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+#include "errno.h"
+
+char _license[] SEC("license") = "GPL";
+
+int pid, err, val;
+
+struct sample {
+ int pid;
+ int seq;
+ long value;
+ char comm[16];
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_RINGBUF);
+} ringbuf SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __uint(max_entries, 1);
+ __type(key, __u32);
+ __type(value, __u32);
+} array_map SEC(".maps");
+
+SEC("tp/syscalls/sys_enter_nanosleep")
+int test_read_write(void *ctx)
+{
+ char write_data[64] = "hello there, world!!";
+ char read_data[64] = {}, buf[64] = {};
+ struct bpf_dynptr ptr;
+ int i;
+
+ if (bpf_get_current_pid_tgid() >> 32 != pid)
+ return 0;
+
+ bpf_ringbuf_reserve_dynptr(&ringbuf, sizeof(write_data), 0, &ptr);
+
+ /* Write data into the dynptr */
+ err = bpf_dynptr_write(&ptr, 0, write_data, sizeof(write_data), 0);
+
+ /* Read the data that was written into the dynptr */
+ err = err ?: bpf_dynptr_read(read_data, sizeof(read_data), &ptr, 0, 0);
+
+ /* Ensure the data we read matches the data we wrote */
+ for (i = 0; i < sizeof(read_data); i++) {
+ if (read_data[i] != write_data[i]) {
+ err = 1;
+ break;
+ }
+ }
+
+ bpf_ringbuf_discard_dynptr(&ptr, 0);
+ return 0;
+}
+
+SEC("tp/syscalls/sys_enter_nanosleep")
+int test_data_slice(void *ctx)
+{
+ __u32 key = 0, val = 235, *map_val;
+ struct bpf_dynptr ptr;
+ __u32 map_val_size;
+ void *data;
+
+ map_val_size = sizeof(*map_val);
+
+ if (bpf_get_current_pid_tgid() >> 32 != pid)
+ return 0;
+
+ bpf_map_update_elem(&array_map, &key, &val, 0);
+
+ map_val = bpf_map_lookup_elem(&array_map, &key);
+ if (!map_val) {
+ err = 1;
+ return 0;
+ }
+
+ bpf_dynptr_from_mem(map_val, map_val_size, 0, &ptr);
+
+ /* Try getting a data slice that is out of range */
+ data = bpf_dynptr_data(&ptr, map_val_size + 1, 1);
+ if (data) {
+ err = 2;
+ return 0;
+ }
+
+ /* Try getting more bytes than available */
+ data = bpf_dynptr_data(&ptr, 0, map_val_size + 1);
+ if (data) {
+ err = 3;
+ return 0;
+ }
+
+ data = bpf_dynptr_data(&ptr, 0, sizeof(__u32));
+ if (!data) {
+ err = 4;
+ return 0;
+ }
+
+ *(__u32 *)data = 999;
+
+ err = bpf_probe_read_kernel(&val, sizeof(val), data);
+ if (err)
+ return 0;
+
+ if (val != *(int *)data)
+ err = 5;
+
+ return 0;
+}
+
+static int ringbuf_callback(__u32 index, void *data)
+{
+ struct sample *sample;
+
+ struct bpf_dynptr *ptr = (struct bpf_dynptr *)data;
+
+ sample = bpf_dynptr_data(ptr, 0, sizeof(*sample));
+ if (!sample)
+ err = 2;
+ else
+ sample->pid += index;
+
+ return 0;
+}
+
+SEC("tp/syscalls/sys_enter_nanosleep")
+int test_ringbuf(void *ctx)
+{
+ struct bpf_dynptr ptr;
+ struct sample *sample;
+
+ if (bpf_get_current_pid_tgid() >> 32 != pid)
+ return 0;
+
+ val = 100;
+
+ /* check that you can reserve a dynamic size reservation */
+ err = bpf_ringbuf_reserve_dynptr(&ringbuf, val, 0, &ptr);
+
+ sample = err ? NULL : bpf_dynptr_data(&ptr, 0, sizeof(*sample));
+ if (!sample) {
+ err = 1;
+ goto done;
+ }
+
+ sample->pid = 10;
+
+ /* Can pass dynptr to callback functions */
+ bpf_loop(10, ringbuf_callback, &ptr, 0);
+
+ if (sample->pid != 55)
+ err = 2;
+
+done:
+ bpf_ringbuf_discard_dynptr(&ptr, 0);
+ return 0;
+}