perf: Fix __perf_event_overflow() vs perf_remove_from_context() race

[ Upstream commit c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae ]

Make sure that __perf_event_overflow() runs with IRQs disabled for all
possible callchains. Specifically the software events can end up running
it with only preemption disabled.

This opens up a race vs perf_event_exit_event() and friends that will go
and free various things the overflow path expects to be present, like
the BPF program.

BUG=b/492076241
TEST=presubmit
RELEASE_NOTE=Fixed KCTF-c9bc175 in the Linux kernel.

cos-patch: security-high
Fixes: 592903cdcbf6 ("perf_counter: add an event_list")
Reported-by: Simond Hu <cmdhh1767@gmail.com>
Change-Id: Ia7da9a567882708c419a94709ce599a537ab5cb1
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Simond Hu <cmdhh1767@gmail.com>
Link: https://patch.msgid.link/20260224122909.GV1395416@noisy.programming.kicks-ass.net
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 5c48fdc4b4623533d86e279f51531a7ba212eb87)
Signed-off-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/138781
Reviewed-by: Miri Amarilio <mirilio@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Dom Huh <domhuh@google.com>