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e939f3d16d
Add trivial end-to-end tests to validate that KF_IMPLICIT_ARGS flag is properly handled by both resolve_btfids and the verifier. Declare kfuncs in bpf_testmod. Check that bpf_prog_aux pointer is set in the kfunc implementation. Verify that calls with implicit args and a legacy case all work. Acked-by: Eduard Zingerman <eddyz87@gmail.com> Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev> Link: https://lore.kernel.org/r/20260120222638.3976562-7-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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extern int bpf_kfunc_implicit_arg(int a) __weak __ksym;
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extern int bpf_kfunc_implicit_arg_impl(int a, struct bpf_prog_aux *aux) __weak __ksym; /* illegal */
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extern int bpf_kfunc_implicit_arg_legacy(int a, int b) __weak __ksym;
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extern int bpf_kfunc_implicit_arg_legacy_impl(int a, int b, struct bpf_prog_aux *aux) __weak __ksym;
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char _license[] SEC("license") = "GPL";
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SEC("syscall")
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__retval(5)
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int test_kfunc_implicit_arg(void *ctx)
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{
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return bpf_kfunc_implicit_arg(5);
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}
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SEC("syscall")
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__failure __msg("cannot find address for kernel function bpf_kfunc_implicit_arg_impl")
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int test_kfunc_implicit_arg_impl_illegal(void *ctx)
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{
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return bpf_kfunc_implicit_arg_impl(5, NULL);
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}
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SEC("syscall")
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__retval(7)
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int test_kfunc_implicit_arg_legacy(void *ctx)
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{
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return bpf_kfunc_implicit_arg_legacy(3, 4);
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}
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SEC("syscall")
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__retval(11)
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int test_kfunc_implicit_arg_legacy_impl(void *ctx)
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{
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return bpf_kfunc_implicit_arg_legacy_impl(5, 6, NULL);
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}
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