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-rw-r--r--tools/testing/selftests/bpf/prog_tests/module_attach.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/module_attach.c b/tools/testing/selftests/bpf/prog_tests/module_attach.c
new file mode 100644
index 000000000..6d0e50dcf
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/module_attach.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+
+#include <test_progs.h>
+#include <stdbool.h>
+#include "test_module_attach.skel.h"
+
+static int duration;
+
+static int trigger_module_test_writable(int *val)
+{
+ int fd, err;
+ char buf[65];
+ ssize_t rd;
+
+ fd = open(BPF_TESTMOD_TEST_FILE, O_RDONLY);
+ err = -errno;
+ if (!ASSERT_GE(fd, 0, "testmode_file_open"))
+ return err;
+
+ rd = read(fd, buf, sizeof(buf) - 1);
+ err = -errno;
+ if (!ASSERT_GT(rd, 0, "testmod_file_rd_val")) {
+ close(fd);
+ return err;
+ }
+
+ buf[rd] = '\0';
+ *val = strtol(buf, NULL, 0);
+ close(fd);
+
+ return 0;
+}
+
+static int delete_module(const char *name, int flags)
+{
+ return syscall(__NR_delete_module, name, flags);
+}
+
+void test_module_attach(void)
+{
+ const int READ_SZ = 456;
+ const int WRITE_SZ = 457;
+ struct test_module_attach* skel;
+ struct test_module_attach__bss *bss;
+ struct bpf_link *link;
+ int err;
+ int writable_val = 0;
+
+ skel = test_module_attach__open();
+ if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
+ return;
+
+ err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
+ 0, "bpf_testmod_test_read");
+ ASSERT_OK(err, "set_attach_target");
+
+ err = test_module_attach__load(skel);
+ if (CHECK(err, "skel_load", "failed to load skeleton\n"))
+ return;
+
+ bss = skel->bss;
+
+ err = test_module_attach__attach(skel);
+ if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
+ goto cleanup;
+
+ /* trigger tracepoint */
+ ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
+ ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
+
+ ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
+ ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
+ ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
+ ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
+ ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
+ ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
+ ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
+ ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
+
+ bss->raw_tp_writable_bare_early_ret = true;
+ bss->raw_tp_writable_bare_out_val = 0xf1f2f3f4;
+ ASSERT_OK(trigger_module_test_writable(&writable_val),
+ "trigger_writable");
+ ASSERT_EQ(bss->raw_tp_writable_bare_in_val, 1024, "writable_test_in");
+ ASSERT_EQ(bss->raw_tp_writable_bare_out_val, writable_val,
+ "writable_test_out");
+
+ test_module_attach__detach(skel);
+
+ /* attach fentry/fexit and make sure it get's module reference */
+ link = bpf_program__attach(skel->progs.handle_fentry);
+ if (!ASSERT_OK_PTR(link, "attach_fentry"))
+ goto cleanup;
+
+ ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
+ bpf_link__destroy(link);
+
+ link = bpf_program__attach(skel->progs.handle_fexit);
+ if (!ASSERT_OK_PTR(link, "attach_fexit"))
+ goto cleanup;
+
+ ASSERT_ERR(delete_module("bpf_testmod", 0), "delete_module");
+ bpf_link__destroy(link);
+
+cleanup:
+ test_module_attach__destroy(skel);
+}