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bpf: Warn with bpf_unreachable() kfunc maybe due to uninitialized variable #8967

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bpf: Warn with bpf_unreachable() kfunc maybe due to uninitialized variable #8967

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d59b99b
bpf: Remove special_kfunc_set from verifier
May 21, 2025
1f1cea0
bpf: Warn with bpf_unreachable() kfunc maybe due to uninitialized var…
May 21, 2025
3452eaa
selftests/bpf: Add unit tests with bpf_unreachable() kfunc
May 21, 2025
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5 changes: 5 additions & 0 deletions kernel/bpf/helpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3273,6 +3273,10 @@ __bpf_kfunc void bpf_local_irq_restore(unsigned long *flags__irq_flag)
local_irq_restore(*flags__irq_flag);
}

__bpf_kfunc void bpf_unreachable(void)
{
}

__bpf_kfunc_end_defs();

BTF_KFUNCS_START(generic_btf_ids)
Expand Down Expand Up @@ -3386,6 +3390,7 @@ BTF_ID_FLAGS(func, bpf_copy_from_user_dynptr, KF_SLEEPABLE)
BTF_ID_FLAGS(func, bpf_copy_from_user_str_dynptr, KF_SLEEPABLE)
BTF_ID_FLAGS(func, bpf_copy_from_user_task_dynptr, KF_SLEEPABLE | KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_copy_from_user_task_str_dynptr, KF_SLEEPABLE | KF_TRUSTED_ARGS)
BTF_ID_FLAGS(func, bpf_unreachable)
BTF_KFUNCS_END(common_btf_ids)

static const struct btf_kfunc_id_set common_kfunc_set = {
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