--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
+
+#define _GNU_SOURCE
+#include <linux/compiler.h>
+#include <linux/ring_buffer.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include <sys/sysinfo.h>
+#include <test_progs.h>
+#include <uapi/linux/bpf.h>
+#include <unistd.h>
+
+#include "user_ringbuf_fail.skel.h"
+#include "user_ringbuf_success.skel.h"
+
+#include "../progs/test_user_ringbuf.h"
+
+static size_t log_buf_sz = 1 << 20; /* 1 MB */
+static char obj_log_buf[1048576];
+static const long c_sample_size = sizeof(struct sample) + BPF_RINGBUF_HDR_SZ;
+static const long c_ringbuf_size = 1 << 12; /* 1 small page */
+static const long c_max_entries = c_ringbuf_size / c_sample_size;
+
+static void drain_current_samples(void)
+{
+ syscall(__NR_getpgid);
+}
+
+static int write_samples(struct user_ring_buffer *ringbuf, uint32_t num_samples)
+{
+ int i, err = 0;
+
+ /* Write some number of samples to the ring buffer. */
+ for (i = 0; i < num_samples; i++) {
+ struct sample *entry;
+ int read;
+
+ entry = user_ring_buffer__reserve(ringbuf, sizeof(*entry));
+ if (!entry) {
+ err = -errno;
+ goto done;
+ }
+
+ entry->pid = getpid();
+ entry->seq = i;
+ entry->value = i * i;
+
+ read = snprintf(entry->comm, sizeof(entry->comm), "%u", i);
+ if (read <= 0) {
+ /* Assert on the error path to avoid spamming logs with
+ * mostly success messages.
+ */
+ ASSERT_GT(read, 0, "snprintf_comm");
+ err = read;
+ user_ring_buffer__discard(ringbuf, entry);
+ goto done;
+ }
+
+ user_ring_buffer__submit(ringbuf, entry);
+ }
+
+done:
+ drain_current_samples();
+
+ return err;
+}
+
+static struct user_ringbuf_success *open_load_ringbuf_skel(void)
+{
+ struct user_ringbuf_success *skel;
+ int err;
+
+ skel = user_ringbuf_success__open();
+ if (!ASSERT_OK_PTR(skel, "skel_open"))
+ return NULL;
+
+ err = bpf_map__set_max_entries(skel->maps.user_ringbuf, c_ringbuf_size);
+ if (!ASSERT_OK(err, "set_max_entries"))
+ goto cleanup;
+
+ err = bpf_map__set_max_entries(skel->maps.kernel_ringbuf, c_ringbuf_size);
+ if (!ASSERT_OK(err, "set_max_entries"))
+ goto cleanup;
+
+ err = user_ringbuf_success__load(skel);
+ if (!ASSERT_OK(err, "skel_load"))
+ goto cleanup;
+
+ return skel;
+
+cleanup:
+ user_ringbuf_success__destroy(skel);
+ return NULL;
+}
+
+static void test_user_ringbuf_mappings(void)
+{
+ int err, rb_fd;
+ int page_size = getpagesize();
+ void *mmap_ptr;
+ struct user_ringbuf_success *skel;
+
+ skel = open_load_ringbuf_skel();
+ if (!skel)
+ return;
+
+ rb_fd = bpf_map__fd(skel->maps.user_ringbuf);
+ /* cons_pos can be mapped R/O, can't add +X with mprotect. */
+ mmap_ptr = mmap(NULL, page_size, PROT_READ, MAP_SHARED, rb_fd, 0);
+ ASSERT_OK_PTR(mmap_ptr, "ro_cons_pos");
+ ASSERT_ERR(mprotect(mmap_ptr, page_size, PROT_WRITE), "write_cons_pos_protect");
+ ASSERT_ERR(mprotect(mmap_ptr, page_size, PROT_EXEC), "exec_cons_pos_protect");
+ ASSERT_ERR_PTR(mremap(mmap_ptr, 0, 4 * page_size, MREMAP_MAYMOVE), "wr_prod_pos");
+ err = -errno;
+ ASSERT_ERR(err, "wr_prod_pos_err");
+ ASSERT_OK(munmap(mmap_ptr, page_size), "unmap_ro_cons");
+
+ /* prod_pos can be mapped RW, can't add +X with mprotect. */
+ mmap_ptr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED,
+ rb_fd, page_size);
+ ASSERT_OK_PTR(mmap_ptr, "rw_prod_pos");
+ ASSERT_ERR(mprotect(mmap_ptr, page_size, PROT_EXEC), "exec_prod_pos_protect");
+ err = -errno;
+ ASSERT_ERR(err, "wr_prod_pos_err");
+ ASSERT_OK(munmap(mmap_ptr, page_size), "unmap_rw_prod");
+
+ /* data pages can be mapped RW, can't add +X with mprotect. */
+ mmap_ptr = mmap(NULL, page_size, PROT_WRITE, MAP_SHARED, rb_fd,
+ 2 * page_size);
+ ASSERT_OK_PTR(mmap_ptr, "rw_data");
+ ASSERT_ERR(mprotect(mmap_ptr, page_size, PROT_EXEC), "exec_data_protect");
+ err = -errno;
+ ASSERT_ERR(err, "exec_data_err");
+ ASSERT_OK(munmap(mmap_ptr, page_size), "unmap_rw_data");
+
+ user_ringbuf_success__destroy(skel);
+}
+
+static int load_skel_create_ringbufs(struct user_ringbuf_success **skel_out,
+ struct ring_buffer **kern_ringbuf_out,
+ ring_buffer_sample_fn callback,
+ struct user_ring_buffer **user_ringbuf_out)
+{
+ struct user_ringbuf_success *skel;
+ struct ring_buffer *kern_ringbuf = NULL;
+ struct user_ring_buffer *user_ringbuf = NULL;
+ int err = -ENOMEM, rb_fd;
+
+ skel = open_load_ringbuf_skel();
+ if (!skel)
+ return err;
+
+ /* only trigger BPF program for current process */
+ skel->bss->pid = getpid();
+
+ if (kern_ringbuf_out) {
+ rb_fd = bpf_map__fd(skel->maps.kernel_ringbuf);
+ kern_ringbuf = ring_buffer__new(rb_fd, callback, skel, NULL);
+ if (!ASSERT_OK_PTR(kern_ringbuf, "kern_ringbuf_create"))
+ goto cleanup;
+
+ *kern_ringbuf_out = kern_ringbuf;
+ }
+
+ if (user_ringbuf_out) {
+ rb_fd = bpf_map__fd(skel->maps.user_ringbuf);
+ user_ringbuf = user_ring_buffer__new(rb_fd, NULL);
+ if (!ASSERT_OK_PTR(user_ringbuf, "user_ringbuf_create"))
+ goto cleanup;
+
+ *user_ringbuf_out = user_ringbuf;
+ ASSERT_EQ(skel->bss->read, 0, "no_reads_after_load");
+ }
+
+ err = user_ringbuf_success__attach(skel);
+ if (!ASSERT_OK(err, "skel_attach"))
+ goto cleanup;
+
+ *skel_out = skel;
+ return 0;
+
+cleanup:
+ if (kern_ringbuf_out)
+ *kern_ringbuf_out = NULL;
+ if (user_ringbuf_out)
+ *user_ringbuf_out = NULL;
+ ring_buffer__free(kern_ringbuf);
+ user_ring_buffer__free(user_ringbuf);
+ user_ringbuf_success__destroy(skel);
+ return err;
+}
+
+static int load_skel_create_user_ringbuf(struct user_ringbuf_success **skel_out,
+ struct user_ring_buffer **ringbuf_out)
+{
+ return load_skel_create_ringbufs(skel_out, NULL, NULL, ringbuf_out);
+}
+
+static void manually_write_test_invalid_sample(struct user_ringbuf_success *skel,
+ __u32 size, __u64 producer_pos, int err)
+{
+ void *data_ptr;
+ __u64 *producer_pos_ptr;
+ int rb_fd, page_size = getpagesize();
+
+ rb_fd = bpf_map__fd(skel->maps.user_ringbuf);
+
+ ASSERT_EQ(skel->bss->read, 0, "num_samples_before_bad_sample");
+
+ /* Map the producer_pos as RW. */
+ producer_pos_ptr = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
+ MAP_SHARED, rb_fd, page_size);
+ ASSERT_OK_PTR(producer_pos_ptr, "producer_pos_ptr");
+
+ /* Map the data pages as RW. */
+ data_ptr = mmap(NULL, page_size, PROT_WRITE, MAP_SHARED, rb_fd, 2 * page_size);
+ ASSERT_OK_PTR(data_ptr, "rw_data");
+
+ memset(data_ptr, 0, BPF_RINGBUF_HDR_SZ);
+ *(__u32 *)data_ptr = size;
+
+ /* Synchronizes with smp_load_acquire() in __bpf_user_ringbuf_peek() in the kernel. */
+ smp_store_release(producer_pos_ptr, producer_pos + BPF_RINGBUF_HDR_SZ);
+
+ drain_current_samples();
+ ASSERT_EQ(skel->bss->read, 0, "num_samples_after_bad_sample");
+ ASSERT_EQ(skel->bss->err, err, "err_after_bad_sample");
+
+ ASSERT_OK(munmap(producer_pos_ptr, page_size), "unmap_producer_pos");
+ ASSERT_OK(munmap(data_ptr, page_size), "unmap_data_ptr");
+}
+
+static void test_user_ringbuf_post_misaligned(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err;
+ __u32 size = (1 << 5) + 7;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (!ASSERT_OK(err, "misaligned_skel"))
+ return;
+
+ manually_write_test_invalid_sample(skel, size, size, -EINVAL);
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_post_producer_wrong_offset(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err;
+ __u32 size = (1 << 5);
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (!ASSERT_OK(err, "wrong_offset_skel"))
+ return;
+
+ manually_write_test_invalid_sample(skel, size, size - 8, -EINVAL);
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_post_larger_than_ringbuf_sz(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err;
+ __u32 size = c_ringbuf_size;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (!ASSERT_OK(err, "huge_sample_skel"))
+ return;
+
+ manually_write_test_invalid_sample(skel, size, size, -E2BIG);
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_basic(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (!ASSERT_OK(err, "ringbuf_basic_skel"))
+ return;
+
+ ASSERT_EQ(skel->bss->read, 0, "num_samples_read_before");
+
+ err = write_samples(ringbuf, 2);
+ if (!ASSERT_OK(err, "write_samples"))
+ goto cleanup;
+
+ ASSERT_EQ(skel->bss->read, 2, "num_samples_read_after");
+
+cleanup:
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_sample_full_ring_buffer(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err;
+ void *sample;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (!ASSERT_OK(err, "ringbuf_full_sample_skel"))
+ return;
+
+ sample = user_ring_buffer__reserve(ringbuf, c_ringbuf_size - BPF_RINGBUF_HDR_SZ);
+ if (!ASSERT_OK_PTR(sample, "full_sample"))
+ goto cleanup;
+
+ user_ring_buffer__submit(ringbuf, sample);
+ ASSERT_EQ(skel->bss->read, 0, "num_samples_read_before");
+ drain_current_samples();
+ ASSERT_EQ(skel->bss->read, 1, "num_samples_read_after");
+
+cleanup:
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_post_alignment_autoadjust(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ struct sample *sample;
+ int err;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (!ASSERT_OK(err, "ringbuf_align_autoadjust_skel"))
+ return;
+
+ /* libbpf should automatically round any sample up to an 8-byte alignment. */
+ sample = user_ring_buffer__reserve(ringbuf, sizeof(*sample) + 1);
+ ASSERT_OK_PTR(sample, "reserve_autoaligned");
+ user_ring_buffer__submit(ringbuf, sample);
+
+ ASSERT_EQ(skel->bss->read, 0, "num_samples_read_before");
+ drain_current_samples();
+ ASSERT_EQ(skel->bss->read, 1, "num_samples_read_after");
+
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_overfill(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (err)
+ return;
+
+ err = write_samples(ringbuf, c_max_entries * 5);
+ ASSERT_ERR(err, "write_samples");
+ ASSERT_EQ(skel->bss->read, c_max_entries, "max_entries");
+
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_discards_properly_ignored(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err, num_discarded = 0;
+ __u64 *token;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (err)
+ return;
+
+ ASSERT_EQ(skel->bss->read, 0, "num_samples_read_before");
+
+ while (1) {
+ /* Write samples until the buffer is full. */
+ token = user_ring_buffer__reserve(ringbuf, sizeof(*token));
+ if (!token)
+ break;
+
+ user_ring_buffer__discard(ringbuf, token);
+ num_discarded++;
+ }
+
+ if (!ASSERT_GE(num_discarded, 0, "num_discarded"))
+ goto cleanup;
+
+ /* Should not read any samples, as they are all discarded. */
+ ASSERT_EQ(skel->bss->read, 0, "num_pre_kick");
+ drain_current_samples();
+ ASSERT_EQ(skel->bss->read, 0, "num_post_kick");
+
+ /* Now that the ring buffer has been drained, we should be able to
+ * reserve another token.
+ */
+ token = user_ring_buffer__reserve(ringbuf, sizeof(*token));
+
+ if (!ASSERT_OK_PTR(token, "new_token"))
+ goto cleanup;
+
+ user_ring_buffer__discard(ringbuf, token);
+cleanup:
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void test_user_ringbuf_loop(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ uint32_t total_samples = 8192;
+ uint32_t remaining_samples = total_samples;
+ int err;
+
+ BUILD_BUG_ON(total_samples <= c_max_entries);
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (err)
+ return;
+
+ do {
+ uint32_t curr_samples;
+
+ curr_samples = remaining_samples > c_max_entries
+ ? c_max_entries : remaining_samples;
+ err = write_samples(ringbuf, curr_samples);
+ if (err != 0) {
+ /* Assert inside of if statement to avoid flooding logs
+ * on the success path.
+ */
+ ASSERT_OK(err, "write_samples");
+ goto cleanup;
+ }
+
+ remaining_samples -= curr_samples;
+ ASSERT_EQ(skel->bss->read, total_samples - remaining_samples,
+ "current_batched_entries");
+ } while (remaining_samples > 0);
+ ASSERT_EQ(skel->bss->read, total_samples, "total_batched_entries");
+
+cleanup:
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static int send_test_message(struct user_ring_buffer *ringbuf,
+ enum test_msg_op op, s64 operand_64,
+ s32 operand_32)
+{
+ struct test_msg *msg;
+
+ msg = user_ring_buffer__reserve(ringbuf, sizeof(*msg));
+ if (!msg) {
+ /* Assert on the error path to avoid spamming logs with mostly
+ * success messages.
+ */
+ ASSERT_OK_PTR(msg, "reserve_msg");
+ return -ENOMEM;
+ }
+
+ msg->msg_op = op;
+
+ switch (op) {
+ case TEST_MSG_OP_INC64:
+ case TEST_MSG_OP_MUL64:
+ msg->operand_64 = operand_64;
+ break;
+ case TEST_MSG_OP_INC32:
+ case TEST_MSG_OP_MUL32:
+ msg->operand_32 = operand_32;
+ break;
+ default:
+ PRINT_FAIL("Invalid operand %d\n", op);
+ user_ring_buffer__discard(ringbuf, msg);
+ return -EINVAL;
+ }
+
+ user_ring_buffer__submit(ringbuf, msg);
+
+ return 0;
+}
+
+static void kick_kernel_read_messages(void)
+{
+ syscall(__NR_prctl);
+}
+
+static int handle_kernel_msg(void *ctx, void *data, size_t len)
+{
+ struct user_ringbuf_success *skel = ctx;
+ struct test_msg *msg = data;
+
+ switch (msg->msg_op) {
+ case TEST_MSG_OP_INC64:
+ skel->bss->user_mutated += msg->operand_64;
+ return 0;
+ case TEST_MSG_OP_INC32:
+ skel->bss->user_mutated += msg->operand_32;
+ return 0;
+ case TEST_MSG_OP_MUL64:
+ skel->bss->user_mutated *= msg->operand_64;
+ return 0;
+ case TEST_MSG_OP_MUL32:
+ skel->bss->user_mutated *= msg->operand_32;
+ return 0;
+ default:
+ fprintf(stderr, "Invalid operand %d\n", msg->msg_op);
+ return -EINVAL;
+ }
+}
+
+static void drain_kernel_messages_buffer(struct ring_buffer *kern_ringbuf,
+ struct user_ringbuf_success *skel)
+{
+ int cnt;
+
+ cnt = ring_buffer__consume(kern_ringbuf);
+ ASSERT_EQ(cnt, 8, "consume_kern_ringbuf");
+ ASSERT_OK(skel->bss->err, "consume_kern_ringbuf_err");
+}
+
+static void test_user_ringbuf_msg_protocol(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *user_ringbuf;
+ struct ring_buffer *kern_ringbuf;
+ int err, i;
+ __u64 expected_kern = 0;
+
+ err = load_skel_create_ringbufs(&skel, &kern_ringbuf, handle_kernel_msg, &user_ringbuf);
+ if (!ASSERT_OK(err, "create_ringbufs"))
+ return;
+
+ for (i = 0; i < 64; i++) {
+ enum test_msg_op op = i % TEST_MSG_OP_NUM_OPS;
+ __u64 operand_64 = TEST_OP_64;
+ __u32 operand_32 = TEST_OP_32;
+
+ err = send_test_message(user_ringbuf, op, operand_64, operand_32);
+ if (err) {
+ /* Only assert on a failure to avoid spamming success logs. */
+ ASSERT_OK(err, "send_test_message");
+ goto cleanup;
+ }
+
+ switch (op) {
+ case TEST_MSG_OP_INC64:
+ expected_kern += operand_64;
+ break;
+ case TEST_MSG_OP_INC32:
+ expected_kern += operand_32;
+ break;
+ case TEST_MSG_OP_MUL64:
+ expected_kern *= operand_64;
+ break;
+ case TEST_MSG_OP_MUL32:
+ expected_kern *= operand_32;
+ break;
+ default:
+ PRINT_FAIL("Unexpected op %d\n", op);
+ goto cleanup;
+ }
+
+ if (i % 8 == 0) {
+ kick_kernel_read_messages();
+ ASSERT_EQ(skel->bss->kern_mutated, expected_kern, "expected_kern");
+ ASSERT_EQ(skel->bss->err, 0, "bpf_prog_err");
+ drain_kernel_messages_buffer(kern_ringbuf, skel);
+ }
+ }
+
+cleanup:
+ ring_buffer__free(kern_ringbuf);
+ user_ring_buffer__free(user_ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static void *kick_kernel_cb(void *arg)
+{
+ /* Kick the kernel, causing it to drain the ring buffer and then wake
+ * up the test thread waiting on epoll.
+ */
+ syscall(__NR_getrlimit);
+
+ return NULL;
+}
+
+static int spawn_kick_thread_for_poll(void)
+{
+ pthread_t thread;
+
+ return pthread_create(&thread, NULL, kick_kernel_cb, NULL);
+}
+
+static void test_user_ringbuf_blocking_reserve(void)
+{
+ struct user_ringbuf_success *skel;
+ struct user_ring_buffer *ringbuf;
+ int err, num_written = 0;
+ __u64 *token;
+
+ err = load_skel_create_user_ringbuf(&skel, &ringbuf);
+ if (err)
+ return;
+
+ ASSERT_EQ(skel->bss->read, 0, "num_samples_read_before");
+
+ while (1) {
+ /* Write samples until the buffer is full. */
+ token = user_ring_buffer__reserve(ringbuf, sizeof(*token));
+ if (!token)
+ break;
+
+ *token = 0xdeadbeef;
+
+ user_ring_buffer__submit(ringbuf, token);
+ num_written++;
+ }
+
+ if (!ASSERT_GE(num_written, 0, "num_written"))
+ goto cleanup;
+
+ /* Should not have read any samples until the kernel is kicked. */
+ ASSERT_EQ(skel->bss->read, 0, "num_pre_kick");
+
+ /* We correctly time out after 1 second, without a sample. */
+ token = user_ring_buffer__reserve_blocking(ringbuf, sizeof(*token), 1000);
+ if (!ASSERT_EQ(token, NULL, "pre_kick_timeout_token"))
+ goto cleanup;
+
+ err = spawn_kick_thread_for_poll();
+ if (!ASSERT_EQ(err, 0, "deferred_kick_thread\n"))
+ goto cleanup;
+
+ /* After spawning another thread that asychronously kicks the kernel to
+ * drain the messages, we're able to block and successfully get a
+ * sample once we receive an event notification.
+ */
+ token = user_ring_buffer__reserve_blocking(ringbuf, sizeof(*token), 10000);
+
+ if (!ASSERT_OK_PTR(token, "block_token"))
+ goto cleanup;
+
+ ASSERT_GT(skel->bss->read, 0, "num_post_kill");
+ ASSERT_LE(skel->bss->read, num_written, "num_post_kill");
+ ASSERT_EQ(skel->bss->err, 0, "err_post_poll");
+ user_ring_buffer__discard(ringbuf, token);
+
+cleanup:
+ user_ring_buffer__free(ringbuf);
+ user_ringbuf_success__destroy(skel);
+}
+
+static struct {
+ const char *prog_name;
+ const char *expected_err_msg;
+} failure_tests[] = {
+ /* failure cases */
+ {"user_ringbuf_callback_bad_access1", "negative offset dynptr_ptr ptr"},
+ {"user_ringbuf_callback_bad_access2", "dereference of modified dynptr_ptr ptr"},
+ {"user_ringbuf_callback_write_forbidden", "invalid mem access 'dynptr_ptr'"},
+ {"user_ringbuf_callback_null_context_write", "invalid mem access 'scalar'"},
+ {"user_ringbuf_callback_null_context_read", "invalid mem access 'scalar'"},
+ {"user_ringbuf_callback_discard_dynptr", "arg 1 is an unacquired reference"},
+ {"user_ringbuf_callback_submit_dynptr", "arg 1 is an unacquired reference"},
+ {"user_ringbuf_callback_invalid_return", "At callback return the register R0 has value"},
+};
+
+#define SUCCESS_TEST(_func) { _func, #_func }
+
+static struct {
+ void (*test_callback)(void);
+ const char *test_name;
+} success_tests[] = {
+ SUCCESS_TEST(test_user_ringbuf_mappings),
+ SUCCESS_TEST(test_user_ringbuf_post_misaligned),
+ SUCCESS_TEST(test_user_ringbuf_post_producer_wrong_offset),
+ SUCCESS_TEST(test_user_ringbuf_post_larger_than_ringbuf_sz),
+ SUCCESS_TEST(test_user_ringbuf_basic),
+ SUCCESS_TEST(test_user_ringbuf_sample_full_ring_buffer),
+ SUCCESS_TEST(test_user_ringbuf_post_alignment_autoadjust),
+ SUCCESS_TEST(test_user_ringbuf_overfill),
+ SUCCESS_TEST(test_user_ringbuf_discards_properly_ignored),
+ SUCCESS_TEST(test_user_ringbuf_loop),
+ SUCCESS_TEST(test_user_ringbuf_msg_protocol),
+ SUCCESS_TEST(test_user_ringbuf_blocking_reserve),
+};
+
+static void verify_fail(const char *prog_name, const char *expected_err_msg)
+{
+ LIBBPF_OPTS(bpf_object_open_opts, opts);
+ struct bpf_program *prog;
+ struct user_ringbuf_fail *skel;
+ int err;
+
+ opts.kernel_log_buf = obj_log_buf;
+ opts.kernel_log_size = log_buf_sz;
+ opts.kernel_log_level = 1;
+
+ skel = user_ringbuf_fail__open_opts(&opts);
+ if (!ASSERT_OK_PTR(skel, "dynptr_fail__open_opts"))
+ goto cleanup;
+
+ prog = bpf_object__find_program_by_name(skel->obj, prog_name);
+ if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
+ goto cleanup;
+
+ bpf_program__set_autoload(prog, true);
+
+ bpf_map__set_max_entries(skel->maps.user_ringbuf, getpagesize());
+
+ err = user_ringbuf_fail__load(skel);
+ if (!ASSERT_ERR(err, "unexpected load success"))
+ goto cleanup;
+
+ if (!ASSERT_OK_PTR(strstr(obj_log_buf, expected_err_msg), "expected_err_msg")) {
+ fprintf(stderr, "Expected err_msg: %s\n", expected_err_msg);
+ fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
+ }
+
+cleanup:
+ user_ringbuf_fail__destroy(skel);
+}
+
+void test_user_ringbuf(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(success_tests); i++) {
+ if (!test__start_subtest(success_tests[i].test_name))
+ continue;
+
+ success_tests[i].test_callback();
+ }
+
+ for (i = 0; i < ARRAY_SIZE(failure_tests); i++) {
+ if (!test__start_subtest(failure_tests[i].prog_name))
+ continue;
+
+ verify_fail(failure_tests[i].prog_name, failure_tests[i].expected_err_msg);
+ }
+}
projects / linux-block.git / commitdiff