diff options
Diffstat (limited to 'kernel/bpf/helpers.c')
| -rw-r--r-- | kernel/bpf/helpers.c | 53 |
1 files changed, 31 insertions, 22 deletions
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index c9fab9a356df..e4007fea4909 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -1215,13 +1215,20 @@ static void bpf_wq_work(struct work_struct *work) rcu_read_unlock_trace(); } +static void bpf_async_cb_rcu_free(struct rcu_head *rcu) +{ + struct bpf_async_cb *cb = container_of(rcu, struct bpf_async_cb, rcu); + + kfree_nolock(cb); +} + static void bpf_wq_delete_work(struct work_struct *work) { struct bpf_work *w = container_of(work, struct bpf_work, delete_work); cancel_work_sync(&w->work); - kfree_rcu(w, cb.rcu); + call_rcu(&w->cb.rcu, bpf_async_cb_rcu_free); } static void bpf_timer_delete_work(struct work_struct *work) @@ -1230,13 +1237,13 @@ static void bpf_timer_delete_work(struct work_struct *work) /* Cancel the timer and wait for callback to complete if it was running. * If hrtimer_cancel() can be safely called it's safe to call - * kfree_rcu(t) right after for both preallocated and non-preallocated + * call_rcu() right after for both preallocated and non-preallocated * maps. The async->cb = NULL was already done and no code path can see * address 't' anymore. Timer if armed for existing bpf_hrtimer before * bpf_timer_cancel_and_free will have been cancelled. */ hrtimer_cancel(&t->timer); - kfree_rcu(t, cb.rcu); + call_rcu(&t->cb.rcu, bpf_async_cb_rcu_free); } static int __bpf_async_init(struct bpf_async_kern *async, struct bpf_map *map, u64 flags, @@ -1270,11 +1277,7 @@ static int __bpf_async_init(struct bpf_async_kern *async, struct bpf_map *map, u goto out; } - /* Allocate via bpf_map_kmalloc_node() for memcg accounting. Until - * kmalloc_nolock() is available, avoid locking issues by using - * __GFP_HIGH (GFP_ATOMIC & ~__GFP_RECLAIM). - */ - cb = bpf_map_kmalloc_node(map, size, __GFP_HIGH, map->numa_node); + cb = bpf_map_kmalloc_nolock(map, size, 0, map->numa_node); if (!cb) { ret = -ENOMEM; goto out; @@ -1315,7 +1318,7 @@ static int __bpf_async_init(struct bpf_async_kern *async, struct bpf_map *map, u * or pinned in bpffs. */ WRITE_ONCE(async->cb, NULL); - kfree(cb); + kfree_nolock(cb); ret = -EPERM; } out: @@ -1580,7 +1583,7 @@ void bpf_timer_cancel_and_free(void *val) * timer _before_ calling us, such that failing to cancel it here will * cause it to possibly use struct hrtimer after freeing bpf_hrtimer. * Therefore, we _need_ to cancel any outstanding timers before we do - * kfree_rcu, even though no more timers can be armed. + * call_rcu, even though no more timers can be armed. * * Moreover, we need to schedule work even if timer does not belong to * the calling callback_fn, as on two different CPUs, we can end up in a @@ -1607,7 +1610,7 @@ void bpf_timer_cancel_and_free(void *val) * completion. */ if (hrtimer_try_to_cancel(&t->timer) >= 0) - kfree_rcu(t, cb.rcu); + call_rcu(&t->cb.rcu, bpf_async_cb_rcu_free); else queue_work(system_dfl_wq, &t->cb.delete_work); } else { @@ -4166,7 +4169,8 @@ release_prog: } /** - * bpf_task_work_schedule_signal - Schedule BPF callback using task_work_add with TWA_SIGNAL mode + * bpf_task_work_schedule_signal_impl - Schedule BPF callback using task_work_add with TWA_SIGNAL + * mode * @task: Task struct for which callback should be scheduled * @tw: Pointer to struct bpf_task_work in BPF map value for internal bookkeeping * @map__map: bpf_map that embeds struct bpf_task_work in the values @@ -4175,15 +4179,17 @@ release_prog: * * Return: 0 if task work has been scheduled successfully, negative error code otherwise */ -__bpf_kfunc int bpf_task_work_schedule_signal(struct task_struct *task, struct bpf_task_work *tw, - void *map__map, bpf_task_work_callback_t callback, - void *aux__prog) +__bpf_kfunc int bpf_task_work_schedule_signal_impl(struct task_struct *task, + struct bpf_task_work *tw, void *map__map, + bpf_task_work_callback_t callback, + void *aux__prog) { return bpf_task_work_schedule(task, tw, map__map, callback, aux__prog, TWA_SIGNAL); } /** - * bpf_task_work_schedule_resume - Schedule BPF callback using task_work_add with TWA_RESUME mode + * bpf_task_work_schedule_resume_impl - Schedule BPF callback using task_work_add with TWA_RESUME + * mode * @task: Task struct for which callback should be scheduled * @tw: Pointer to struct bpf_task_work in BPF map value for internal bookkeeping * @map__map: bpf_map that embeds struct bpf_task_work in the values @@ -4192,9 +4198,10 @@ __bpf_kfunc int bpf_task_work_schedule_signal(struct task_struct *task, struct b * * Return: 0 if task work has been scheduled successfully, negative error code otherwise */ -__bpf_kfunc int bpf_task_work_schedule_resume(struct task_struct *task, struct bpf_task_work *tw, - void *map__map, bpf_task_work_callback_t callback, - void *aux__prog) +__bpf_kfunc int bpf_task_work_schedule_resume_impl(struct task_struct *task, + struct bpf_task_work *tw, void *map__map, + bpf_task_work_callback_t callback, + void *aux__prog) { return bpf_task_work_schedule(task, tw, map__map, callback, aux__prog, TWA_RESUME); } @@ -4342,6 +4349,7 @@ BTF_ID_FLAGS(func, bpf_iter_kmem_cache_next, KF_ITER_NEXT | KF_RET_NULL | KF_SLE BTF_ID_FLAGS(func, bpf_iter_kmem_cache_destroy, KF_ITER_DESTROY | KF_SLEEPABLE) BTF_ID_FLAGS(func, bpf_local_irq_save) BTF_ID_FLAGS(func, bpf_local_irq_restore) +#ifdef CONFIG_BPF_EVENTS BTF_ID_FLAGS(func, bpf_probe_read_user_dynptr) BTF_ID_FLAGS(func, bpf_probe_read_kernel_dynptr) BTF_ID_FLAGS(func, bpf_probe_read_user_str_dynptr) @@ -4350,6 +4358,7 @@ BTF_ID_FLAGS(func, bpf_copy_from_user_dynptr, KF_SLEEPABLE) BTF_ID_FLAGS(func, bpf_copy_from_user_str_dynptr, KF_SLEEPABLE) BTF_ID_FLAGS(func, bpf_copy_from_user_task_dynptr, KF_SLEEPABLE | KF_TRUSTED_ARGS) BTF_ID_FLAGS(func, bpf_copy_from_user_task_str_dynptr, KF_SLEEPABLE | KF_TRUSTED_ARGS) +#endif #ifdef CONFIG_DMA_SHARED_BUFFER BTF_ID_FLAGS(func, bpf_iter_dmabuf_new, KF_ITER_NEW | KF_SLEEPABLE) BTF_ID_FLAGS(func, bpf_iter_dmabuf_next, KF_ITER_NEXT | KF_RET_NULL | KF_SLEEPABLE) @@ -4371,9 +4380,9 @@ BTF_ID_FLAGS(func, bpf_strnstr); #if defined(CONFIG_BPF_LSM) && defined(CONFIG_CGROUPS) BTF_ID_FLAGS(func, bpf_cgroup_read_xattr, KF_RCU) #endif -BTF_ID_FLAGS(func, bpf_stream_vprintk, KF_TRUSTED_ARGS) -BTF_ID_FLAGS(func, bpf_task_work_schedule_signal, KF_TRUSTED_ARGS) -BTF_ID_FLAGS(func, bpf_task_work_schedule_resume, KF_TRUSTED_ARGS) +BTF_ID_FLAGS(func, bpf_stream_vprintk_impl, KF_TRUSTED_ARGS) +BTF_ID_FLAGS(func, bpf_task_work_schedule_signal_impl, KF_TRUSTED_ARGS) +BTF_ID_FLAGS(func, bpf_task_work_schedule_resume_impl, KF_TRUSTED_ARGS) BTF_KFUNCS_END(common_btf_ids) static const struct btf_kfunc_id_set common_kfunc_set = { |