Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Cross-merge networking fixes after downstream PR.

Conflicts:

net/mac80211/rx.c
  91535613b609 ("wifi: mac80211: don't drop all unprotected public action frames")
  6c02fab72429 ("wifi: mac80211: split ieee80211_drop_unencrypted_mgmt() return value")

Adjacent changes:

drivers/net/ethernet/apm/xgene/xgene_enet_main.c
  61471264c018 ("net: ethernet: apm: Convert to platform remove callback returning void")
  d2ca43f30611 ("net: xgene: Fix unused xgene_enet_of_match warning for !CONFIG_OF")

net/vmw_vsock/virtio_transport.c
  64c99d2d6ada ("vsock/virtio: support to send non-linear skb")
  53b08c498515 ("vsock/virtio: initialize the_virtio_vsock before using VQs")

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 33 insertions, 6 deletions

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4c72a41f11af..d0663b9324e7 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1954,6 +1954,7 @@ static void perf_group_attach(struct perf_event *event)
 
 	list_add_tail(&event->sibling_list, &group_leader->sibling_list);
 	group_leader->nr_siblings++;
+	group_leader->group_generation++;
 
 	perf_event__header_size(group_leader);
 
@@ -2144,6 +2145,7 @@ static void perf_group_detach(struct perf_event *event)
 	if (leader != event) {
 		list_del_init(&event->sibling_list);
 		event->group_leader->nr_siblings--;
+		event->group_leader->group_generation++;
 		goto out;
 	}
 
@@ -5440,7 +5442,7 @@ static int __perf_read_group_add(struct perf_event *leader,
 					u64 read_format, u64 *values)
 {
 	struct perf_event_context *ctx = leader->ctx;
-	struct perf_event *sub;
+	struct perf_event *sub, *parent;
 	unsigned long flags;
 	int n = 1; /* skip @nr */
 	int ret;
@@ -5450,6 +5452,33 @@ static int __perf_read_group_add(struct perf_event *leader,
 		return ret;
 
 	raw_spin_lock_irqsave(&ctx->lock, flags);
+	/*
+	 * Verify the grouping between the parent and child (inherited)
+	 * events is still in tact.
+	 *
+	 * Specifically:
+	 *  - leader->ctx->lock pins leader->sibling_list
+	 *  - parent->child_mutex pins parent->child_list
+	 *  - parent->ctx->mutex pins parent->sibling_list
+	 *
+	 * Because parent->ctx != leader->ctx (and child_list nests inside
+	 * ctx->mutex), group destruction is not atomic between children, also
+	 * see perf_event_release_kernel(). Additionally, parent can grow the
+	 * group.
+	 *
+	 * Therefore it is possible to have parent and child groups in a
+	 * different configuration and summing over such a beast makes no sense
+	 * what so ever.
+	 *
+	 * Reject this.
+	 */
+	parent = leader->parent;
+	if (parent &&
+	    (parent->group_generation != leader->group_generation ||
+	     parent->nr_siblings != leader->nr_siblings)) {
+		ret = -ECHILD;
+		goto unlock;
+	}
 
 	/*
 	 * Since we co-schedule groups, {enabled,running} times of siblings
@@ -5483,8 +5512,9 @@ static int __perf_read_group_add(struct perf_event *leader,
 			values[n++] = atomic64_read(&sub->lost_samples);
 	}
 
+unlock:
 	raw_spin_unlock_irqrestore(&ctx->lock, flags);
-	return 0;
+	return ret;
 }
 
 static int perf_read_group(struct perf_event *event,
@@ -5503,10 +5533,6 @@ static int perf_read_group(struct perf_event *event,
 
 	values[0] = 1 + leader->nr_siblings;
 
-	/*
-	 * By locking the child_mutex of the leader we effectively
-	 * lock the child list of all siblings.. XXX explain how.
-	 */
 	mutex_lock(&leader->child_mutex);
 
 	ret = __perf_read_group_add(leader, read_format, values);
@@ -13346,6 +13372,7 @@ static int inherit_group(struct perf_event *parent_event,
 		    !perf_get_aux_event(child_ctr, leader))
 			return -EINVAL;
 	}
+	leader->group_generation = parent_event->group_generation;
 	return 0;
 }