Commit 1e38abef authored by Andrii Nakryiko's avatar Andrii Nakryiko Committed by Alexei Starovoitov
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selftests/bpf: Add fentry/fexit/fmod_ret selftest for kernel module 



Add new selftest checking attachment of fentry/fexit/fmod_ret (and raw
tracepoint ones for completeness) BPF programs to kernel module function.

Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201203204634.1325171-15-andrii@kernel.org
parent bc9ed69c

tools/testing/selftests/bpf/prog_tests/module_attach.c

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// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2020 Facebook */



#include <test_progs.h>

#include "test_module_attach.skel.h"



static int duration;



static int trigger_module_test_read(int read_sz)

{

	int fd, err;



	fd = open("/sys/kernel/bpf_testmod", O_RDONLY);

	err = -errno;

	if (CHECK(fd < 0, "testmod_file_open", "failed: %d\n", err))

		return err;



	read(fd, NULL, read_sz);

	close(fd);



	return 0;

}



void test_module_attach(void)

{

	const int READ_SZ = 456;

	struct test_module_attach* skel;

	struct test_module_attach__bss *bss;

	int err;



	skel = test_module_attach__open_and_load();

	if (CHECK(!skel, "skel_open", "failed to open 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_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");

	ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");

	ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");

	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");



cleanup:

	test_module_attach__destroy(skel);

}

tools/testing/selftests/bpf/progs/test_module_attach.c

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// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2020 Facebook */



#include "vmlinux.h"

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>

#include <bpf/bpf_core_read.h>

#include "../bpf_testmod/bpf_testmod.h"



__u32 raw_tp_read_sz = 0;



SEC("raw_tp/bpf_testmod_test_read")

int BPF_PROG(handle_raw_tp,

	     struct task_struct *task, struct bpf_testmod_test_read_ctx *read_ctx)

{

	raw_tp_read_sz = BPF_CORE_READ(read_ctx, len);

	return 0;

}



__u32 tp_btf_read_sz = 0;



SEC("tp_btf/bpf_testmod_test_read")

int BPF_PROG(handle_tp_btf,

	     struct task_struct *task, struct bpf_testmod_test_read_ctx *read_ctx)

{

	tp_btf_read_sz = read_ctx->len;

	return 0;

}



__u32 fentry_read_sz = 0;



SEC("fentry/bpf_testmod_test_read")

int BPF_PROG(handle_fentry,

	     struct file *file, struct kobject *kobj,

	     struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)

{

	fentry_read_sz = len;

	return 0;

}



__u32 fexit_read_sz = 0;

int fexit_ret = 0;



SEC("fexit/bpf_testmod_test_read")

int BPF_PROG(handle_fexit,

	     struct file *file, struct kobject *kobj,

	     struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len,

	     int ret)

{

	fexit_read_sz = len;

	fexit_ret = ret;

	return 0;

}



__u32 fmod_ret_read_sz = 0;



SEC("fmod_ret/bpf_testmod_test_read")

int BPF_PROG(handle_fmod_ret,

	     struct file *file, struct kobject *kobj,

	     struct bin_attribute *bin_attr, char *buf, loff_t off, size_t len)

{

	fmod_ret_read_sz = len;

	return 0; /* don't override the exit code */

}



char _license[] SEC("license") = "GPL";