1 // SPDX-License-Identifier: GPL-2.0
13 int err, pid;  variable
24 /* The two-param bpf_task_acquire doesn't exist */
36 	return pid == cur_pid;  in is_test_kfunc_task()
54 		asm volatile ("goto -1"); /* for (;;); */  in test_acquire_release()
147 	struct __tasks_kfunc_map_value *v, *local;  in BPF_PROG()  local
166 	kptr = bpf_kptr_xchg(&v->task, NULL);  in BPF_PROG()
172 	local = bpf_obj_new(typeof(*local));  in BPF_PROG()
173 	if (!local) {  in BPF_PROG()
179 	kptr = bpf_kptr_xchg(&local->task, kptr);  in BPF_PROG()
182 		bpf_obj_drop(local);  in BPF_PROG()
187 	kptr = bpf_kptr_xchg(&local->task, NULL);  in BPF_PROG()
190 		bpf_obj_drop(local);  in BPF_PROG()
194 	/* Stash a copy into local kptr and check if it is released recursively */  in BPF_PROG()
198 		bpf_obj_drop(local);  in BPF_PROG()
202 	bpf_probe_read_kernel(&refcnt, sizeof(refcnt), &acquired->rcu_users);  in BPF_PROG()
204 	acquired = bpf_kptr_xchg(&local->task, acquired);  in BPF_PROG()
207 		bpf_obj_drop(local);  in BPF_PROG()
213 	bpf_obj_drop(local);  in BPF_PROG()
215 	bpf_probe_read_kernel(&refcnt_after_drop, sizeof(refcnt_after_drop), &kptr->rcu_users);  in BPF_PROG()
250 	kptr = v->task;  in BPF_PROG()
287 	acquired = bpf_task_from_pid(p->pid);  in lookup_compare_pid()
293 	if (acquired->pid != p->pid)  in lookup_compare_pid()
318 static int is_pid_lookup_valid(s32 pid)  in is_pid_lookup_valid()  argument
322 	acquired = bpf_task_from_pid(pid);  in is_pid_lookup_valid()
337 	bpf_strncmp(task->comm, 12, "foo");  in BPF_PROG()
338 	bpf_strncmp(task->comm, 16, "foo");  in BPF_PROG()
339 	bpf_strncmp(&task->comm[8], 4, "foo");  in BPF_PROG()
341 	if (is_pid_lookup_valid(-1)) {  in BPF_PROG()
359 	/* task->group_leader is listed as a trusted, non-NULL field of task struct. */  in BPF_PROG()
360 	acquired = bpf_task_acquire(task->group_leader);  in BPF_PROG()
383 	/* The current process should be the init process (pid 1) in the new pid namespace. */  in test_task_from_vpid_current()
396 	v_task = bpf_task_from_vpid(-1);  in test_task_from_vpid_invalid()
402 	/* There should be only one process (current process) in the new pid namespace. */  in test_task_from_vpid_invalid()