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selftests/bpf: Test returning referenced kptr from struct_ops programs

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Test struct_ops programs returning referenced kptr. When the return type
of a struct_ops operator is pointer to struct, the verifier should
only allow programs that return a scalar NULL or a non-local kptr with the
correct type in its unmodified form.

Signed-off-by: Amery Hung <amery.hung@bytedance.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20250217190640.1748177-6-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Amery Hung
2025-02-17 11:06:40 -08:00
committed by Alexei Starovoitov
parent 8d9f547f74
commit af17bad9fb
8 changed files with 173 additions and 0 deletions
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8
tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
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@@ -1182,11 +1182,19 @@ static int bpf_testmod_ops__test_refcounted(int dummy,
return 0;
}
static struct task_struct *
bpf_testmod_ops__test_return_ref_kptr(int dummy, struct task_struct *task__ref,
struct cgroup *cgrp)
{
return NULL;
}
static struct bpf_testmod_ops __bpf_testmod_ops = {
.test_1 = bpf_testmod_test_1,
.test_2 = bpf_testmod_test_2,
.test_maybe_null = bpf_testmod_ops__test_maybe_null,
.test_refcounted = bpf_testmod_ops__test_refcounted,
.test_return_ref_kptr = bpf_testmod_ops__test_return_ref_kptr,
};
struct bpf_struct_ops bpf_bpf_testmod_ops = {