diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/struct_ops_refcounted.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/struct_ops_refcounted.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/struct_ops_refcounted.c b/tools/testing/selftests/bpf/progs/struct_ops_refcounted.c new file mode 100644 index 000000000000..76dcb6089d7f --- /dev/null +++ b/tools/testing/selftests/bpf/progs/struct_ops_refcounted.c @@ -0,0 +1,31 @@ +#include <vmlinux.h> +#include <bpf/bpf_tracing.h> +#include "../test_kmods/bpf_testmod.h" +#include "bpf_misc.h" + +char _license[] SEC("license") = "GPL"; + +__attribute__((nomerge)) extern void bpf_task_release(struct task_struct *p) __ksym; + +/* This is a test BPF program that uses struct_ops to access a referenced + * kptr argument. This is a test for the verifier to ensure that it + * 1) recongnizes the task as a referenced object (i.e., ref_obj_id > 0), and + * 2) the same reference can be acquired from multiple paths as long as it + * has not been released. + */ +SEC("struct_ops/test_refcounted") +int BPF_PROG(refcounted, int dummy, struct task_struct *task) +{ + if (dummy == 1) + bpf_task_release(task); + else + bpf_task_release(task); + return 0; +} + +SEC(".struct_ops.link") +struct bpf_testmod_ops testmod_refcounted = { + .test_refcounted = (void *)refcounted, +}; + + |