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selftests/bpf: Tweak cgroup kfunc test.
Adjust cgroup kfunc test to dereference RCU protected cgroup pointer as PTR_TRUSTED and pass into KF_TRUSTED_ARGS kfunc. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: David Vernet <void@manifault.com> Link: https://lore.kernel.org/bpf/20230303041446.3630-6-alexei.starovoitov@gmail.com
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@ -61,7 +61,7 @@ int BPF_PROG(test_cgrp_acquire_leave_in_map, struct cgroup *cgrp, const char *pa
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path)
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{
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struct cgroup *kptr;
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struct cgroup *kptr, *cg;
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struct __cgrps_kfunc_map_value *v;
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long status;
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@ -80,6 +80,16 @@ int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path)
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return 0;
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}
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kptr = v->cgrp;
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if (!kptr) {
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err = 4;
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return 0;
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}
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cg = bpf_cgroup_ancestor(kptr, 1);
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if (cg) /* verifier only check */
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bpf_cgroup_release(cg);
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kptr = bpf_kptr_xchg(&v->cgrp, NULL);
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if (!kptr) {
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err = 3;
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