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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/test_kfunc_param_nullable.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/test_kfunc_param_nullable.c
Extension
.c
Size
872 bytes
Lines
44
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc */
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "bpf_kfuncs.h"
#include "../test_kmods/bpf_testmod_kfunc.h"

SEC("tc")
int kfunc_dynptr_nullable_test1(struct __sk_buff *skb)
{
	struct bpf_dynptr data;

	bpf_dynptr_from_skb(skb, 0, &data);
	bpf_kfunc_dynptr_test(&data, NULL);

	return 0;
}

SEC("tc")
int kfunc_dynptr_nullable_test2(struct __sk_buff *skb)
{
	struct bpf_dynptr data;

	bpf_dynptr_from_skb(skb, 0, &data);
	bpf_kfunc_dynptr_test(&data, &data);

	return 0;
}

SEC("tc")
__failure __msg("Possibly NULL pointer passed to trusted R1")
int kfunc_dynptr_nullable_test3(struct __sk_buff *skb)
{
	struct bpf_dynptr data;

	bpf_dynptr_from_skb(skb, 0, &data);
	bpf_kfunc_dynptr_test(NULL, &data);

	return 0;
}

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

Annotation

Implementation Notes