f612210d45
dummy_st_ops.test_2 and dummy_st_ops.test_sleepable do not have their 'state' parameter marked as nullable. Update dummy_st_ops.c to avoid passing NULL for such parameters, as the next patch would allow kernel to enforce this restriction. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/r/20240424012821.595216-4-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2021. Huawei Technologies Co., Ltd */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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SEC("struct_ops/test_1")
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int BPF_PROG(test_1, struct bpf_dummy_ops_state *state)
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{
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int ret;
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/* Check that 'state' nullable status is detected correctly.
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* If 'state' argument would be assumed non-null by verifier
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* the code below would be deleted as dead (which it shouldn't).
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* Hide it from the compiler behind 'asm' block to avoid
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* unnecessary optimizations.
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*/
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asm volatile (
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"if %[state] != 0 goto +2;"
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"r0 = 0xf2f3f4f5;"
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"exit;"
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::[state]"p"(state));
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ret = state->val;
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state->val = 0x5a;
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return ret;
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}
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__u64 test_2_args[5];
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SEC("struct_ops/test_2")
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int BPF_PROG(test_2, struct bpf_dummy_ops_state *state, int a1, unsigned short a2,
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char a3, unsigned long a4)
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{
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test_2_args[0] = state->val;
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test_2_args[1] = a1;
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test_2_args[2] = a2;
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test_2_args[3] = a3;
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test_2_args[4] = a4;
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return 0;
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}
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SEC("struct_ops.s/test_sleepable")
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int BPF_PROG(test_sleepable, struct bpf_dummy_ops_state *state)
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{
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return 0;
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}
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SEC(".struct_ops")
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struct bpf_dummy_ops dummy_1 = {
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.test_1 = (void *)test_1,
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.test_2 = (void *)test_2,
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.test_sleepable = (void *)test_sleepable,
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};
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