Merge branch 'bpf-fix-bpf_send_signal_task-from-kernel-thread-context'

Aditya Sharma says:

====================
bpf: Fix bpf_send_signal_task() from kernel thread context

bpf_send_signal_task() returns -EPERM whenever the calling context is a
kernel thread, even when the signal is for a different task. The
cause is the nmi_uaccess_okay() check in bpf_send_signal_common(),
which is a statement about current and not about the target task.

Patch 1 removes the check, as the signal path does no user memory
access and the check has nothing to guard there.

Patch 2 adds a selftest that sends a signal to a user task from
tp_btf/workqueue_execute_start, where current is always a kworker.
Without patch 1, this test fails on x86.

v1 -> v2:
- Rebase onto current bpf-next.
- Add this cover letter (v1 was sent without one)
- Remove nmi_uaccess_okay() check (as per Andrii)
- Fixed a stale comment above checks in bpf_send_signal_common()
- Gate send_signal_kworker on a new kworker_test global that only this
  test sets. (Sashiko AI review)
- Put /* of a multi line comment on its own line (Sashiko AI review)

v1: https://lore.kernel.org/bpf/20260902150439.692725-1-adi.sharma@zohomail.in/
====================

Link: https://patch.msgid.link/20261001072449.1377267-1-adi.sharma@zohomail.in
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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