bpf_task_from_vpid(9)

💅 bpf_task_from_vpid(9) — kernel API manual, but make it make sense

okay so bestie, welcome to bpf_task_from_vpid(9) ✨ this one lives in the kernel API manual, and it's genuinely one of the more useful little gremlins in the BPF helper family. let's get into it 🫶

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🌸 NAME 🌸

bpf_task_from_vpid — find a struct task_struct from its vpid by looking it up in the pid namespace of the current task. iykyk, that namespace part is the whole personality of this function 💅

⚠️ and like, listen to me: if a task is returned, you must either store it in a map, or release it with bpf_task_release(). no cap. don't just leave it vibing there, that's a leak and it's not cute 😭

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✨ SYNOPSIS ✨

__bpf_kfunc struct task_struct * bpf_task_from_vpid (s32 vpid );

that's it. that's the whole signature. iconic, honestly 👑

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🎀 ARGUMENTS 🎀

• vpid — the vpid of the task you're looking up. yes queen, that's the one you want 🍓

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🔥 SEE ALSO 🔥

the kernel file in question is ./kernel/bpf/helpers.c, and here's the full friend group — every single one of them, no skips, periodt:

bpf_obj_new(9), bpf_percpu_obj_new(9), bpf_obj_drop(9), bpf_percpu_obj_drop(9), bpf_refcount_acquire(9), bpf_list_push_front(9), bpf_list_push_back(9), bpf_rbtree_add(9), bpf_task_acquire(9), bpf_task_release(9), bpf_cgroup_acquire(9), bpf_cgroup_release(9), bpf_cgroup_ancestor(9), bpf_cgroup_from_id(9), bpf_task_under_cgroup(9), bpf_task_get_cgroup1(9), bpf_task_from_pid(9), bpf_dynptr_slice(9), bpf_dynptr_slice_rdwr(9), bpf_dynptr_copy(9), bpf_dynptr_memset(9), bpf_iter_bits_new(9), bpf_iter_bits_next(9), bpf_iter_bits_destroy(9), bpf_copy_from_user_str(9), bpf_copy_from_user_task_str(9), bpf_strcmp(9), bpf_strcasecmp(9), bpf_strnchr(9), bpf_strchr(9), bpf_strchrnul(9), bpf_strrchr(9), bpf_strnlen(9), bpf_strlen(9), bpf_strspn(9), bpf_strcspn(9), bpf_strstr(9), bpf_strcasestr(9), bpf_strnstr(9), bpf_strncasestr(9), bpf_lookup_user_key(9), bpf_lookup_system_key(9), bpf_key_put(9), bpf_verify_pkcs7_signature(9), bpf_task_work_schedule_signal(9), bpf_task_work_schedule_resume(9), bpf_timer_cancel_async(9)

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and that's the whole page bestie, go acquire (and release) responsibly 🧚💜

sign-off szn 🌈: this little beauty comes to you from ./kernel/bpf, dated October 2026, and its manual-page name is of course bpf_task_from_vpid(9) — screenshot it, frame it, put it on your wall 💖