[PATCH v4 1/5] exit: perform add_device_randomness() without tasklist_lock

Mateusz Guzik
2025-02-05T19:32:57Z

Parallel calls to add_device_randomness() contend on their own.

The clone side aleady runs outside of tasklist_lock, which in turn means
any caller on the exit side extends the tasklist_lock hold time while
contending on the random-private lock.

Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
---
kernel/exit.c | 6 +++---
scripts/selinux/genheaders/genheaders | Bin 90112 -> 0 bytes
2 files changed, 3 insertions(+), 3 deletions(-)
delete mode 100755 scripts/selinux/genheaders/genheaders

diff --git a/kernel/exit.c b/kernel/exit.c
index 3485e5fc499e..c79b41509cd3 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -174,9 +174,6 @@ static void __exit_signal(struct task_struct *tsk)
sig->curr_target = next_thread(tsk);
}

- add_device_randomness((const void*) &tsk->se.sum_exec_runtime,
- sizeof(unsigned long long));
-
/*
* Accumulate here the counters for all threads as they die. We could
* skip the group leader because it is the last user of signal_struct,
@@ -278,6 +275,9 @@ void release_task(struct task_struct *p)
write_unlock_irq(&tasklist_lock);
proc_flush_pid(thread_pid);
put_pid(thread_pid);
+ add_device_randomness(&p->se.sum_exec_runtime,
+ sizeof(p->se.sum_exec_runtime));
+ free_pids(post.pids);
release_thread(p);
put_task_struct_rcu_user(p);

diff --git a/scripts/selinux/genheaders/genheaders b/scripts/selinux/genheaders/genheaders
deleted file mode 100755
index 3fc32a664a7930b12a38d02449aec78d49690dfe..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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2.43.0