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selftests/bpf: Tweak cgroup kfunc test.

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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
This commit is contained in:
Alexei Starovoitov 2023-03-02 20:14:45 -08:00 committed by Daniel Borkmann
parent 838bd4ac9a
commit 0047d8343f
1 changed files with 11 additions and 1 deletions
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12
tools/testing/selftests/bpf/progs/cgrp_kfunc_success.c
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@ -61,7 +61,7 @@ int BPF_PROG(test_cgrp_acquire_leave_in_map, struct cgroup *cgrp, const char *pa
SEC("tp_btf/cgroup_mkdir") SEC("tp_btf/cgroup_mkdir")
int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path) int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path)
{ {
struct cgroup *kptr; struct cgroup *kptr, *cg;
struct __cgrps_kfunc_map_value *v; struct __cgrps_kfunc_map_value *v;
long status; long status;
@ -80,6 +80,16 @@ int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path)
return 0; return 0;
} }
kptr = v->cgrp;
if (!kptr) {
err = 4;
return 0;
}
cg = bpf_cgroup_ancestor(kptr, 1);
if (cg) /* verifier only check */
bpf_cgroup_release(cg);
kptr = bpf_kptr_xchg(&v->cgrp, NULL); kptr = bpf_kptr_xchg(&v->cgrp, NULL);
if (!kptr) { if (!kptr) {
err = 3; err = 3;