perf_events: Fix races in group composition

commit 8a49542c0554af7d0073aac0ee73ee65b807ef34 upstream.

Group siblings don't pin each-other or the parent, so when we destroy
events we must make sure to clean up all cross referencing pointers.

In particular, for destruction of a group leader we must be able to
find all its siblings and remove their reference to it.

This means that detaching an event from its context must not detach it
from the group, otherwise we can end up failing to clear all pointers.

Solve this by clearly separating the attachment to a context and
attachment to a group, and keep the group composed until we destroy
the events.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index eea91881fe24f7bfd653e0c49ff58eb7e1c467f0..c6e14329b6567f12ad40dbdb56e72a4d8dc57d34 100644 (file)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -571,6 +571,9 @@ enum perf_group_flag {
        PERF_GROUP_SOFTWARE = 0x1,
 };
 
+#define PERF_ATTACH_CONTEXT    0x01
+#define PERF_ATTACH_GROUP      0x02
+
 /**
  * struct perf_event - performance event kernel representation:
  */
@@ -585,6 +588,7 @@ struct perf_event {
        const struct pmu                *pmu;
 
        enum perf_event_active_state    state;
+       unsigned int                    attach_state;
        atomic64_t                      count;
 
        /*

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 540c26b0ab11cdd69f27e9f080acf4e96ed6b7e2..0e4499e9b751fd1ababf476b61d2907e5152a155 100644 (file)
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -291,14 +291,15 @@ ctx_group_list(struct perf_event *event, struct perf_event_context *ctx)
 static void
 list_add_event(struct perf_event *event, struct perf_event_context *ctx)
 {
-       struct perf_event *group_leader = event->group_leader;
+       WARN_ON_ONCE(event->attach_state & PERF_ATTACH_CONTEXT);
+       event->attach_state |= PERF_ATTACH_CONTEXT;
 
        /*
-        * Depending on whether it is a standalone or sibling event,
-        * add it straight to the context's event list, or to the group
-        * leader's sibling list:
+        * If we're a stand alone event or group leader, we go to the context
+        * list, group events are kept attached to the group so that
+        * perf_group_detach can, at all times, locate all siblings.
         */
-       if (group_leader == event) {
+       if (event->group_leader == event) {
                struct list_head *list;
 
                if (is_software_event(event))
@@ -306,13 +307,6 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
 
                list = ctx_group_list(event, ctx);
                list_add_tail(&event->group_entry, list);
-       } else {
-               if (group_leader->group_flags & PERF_GROUP_SOFTWARE &&
-                   !is_software_event(event))
-                       group_leader->group_flags &= ~PERF_GROUP_SOFTWARE;
-
-               list_add_tail(&event->group_entry, &group_leader->sibling_list);
-               group_leader->nr_siblings++;
        }
 
        list_add_rcu(&event->event_entry, &ctx->event_list);
@@ -321,6 +315,24 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
                ctx->nr_stat++;
 }
 
+static void perf_group_attach(struct perf_event *event)
+{
+       struct perf_event *group_leader = event->group_leader;
+
+       WARN_ON_ONCE(event->attach_state & PERF_ATTACH_GROUP);
+       event->attach_state |= PERF_ATTACH_GROUP;
+
+       if (group_leader == event)
+               return;
+
+       if (group_leader->group_flags & PERF_GROUP_SOFTWARE &&
+                       !is_software_event(event))
+               group_leader->group_flags &= ~PERF_GROUP_SOFTWARE;
+
+       list_add_tail(&event->group_entry, &group_leader->sibling_list);
+       group_leader->nr_siblings++;
+}
+
 /*
  * Remove a event from the lists for its context.
  * Must be called with ctx->mutex and ctx->lock held.
@@ -328,17 +340,22 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
 static void
 list_del_event(struct perf_event *event, struct perf_event_context *ctx)
 {
-       if (list_empty(&event->group_entry))
+       /*
+        * We can have double detach due to exit/hot-unplug + close.
+        */
+       if (!(event->attach_state & PERF_ATTACH_CONTEXT))
                return;
+
+       event->attach_state &= ~PERF_ATTACH_CONTEXT;
+
        ctx->nr_events--;
        if (event->attr.inherit_stat)
                ctx->nr_stat--;
 
-       list_del_init(&event->group_entry);
        list_del_rcu(&event->event_entry);
 
-       if (event->group_leader != event)
-               event->group_leader->nr_siblings--;
+       if (event->group_leader == event)
+               list_del_init(&event->group_entry);
 
        update_group_times(event);
 
@@ -353,21 +370,39 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
                event->state = PERF_EVENT_STATE_OFF;
 }
 
-static void
-perf_destroy_group(struct perf_event *event, struct perf_event_context *ctx)
+static void perf_group_detach(struct perf_event *event)
 {
        struct perf_event *sibling, *tmp;
+       struct list_head *list = NULL;
+
+       /*
+        * We can have double detach due to exit/hot-unplug + close.
+        */
+       if (!(event->attach_state & PERF_ATTACH_GROUP))
+               return;
+
+       event->attach_state &= ~PERF_ATTACH_GROUP;
+
+       /*
+        * If this is a sibling, remove it from its group.
+        */
+       if (event->group_leader != event) {
+               list_del_init(&event->group_entry);
+               event->group_leader->nr_siblings--;
+               return;
+       }
+
+       if (!list_empty(&event->group_entry))
+               list = &event->group_entry;
 
        /*
         * If this was a group event with sibling events then
         * upgrade the siblings to singleton events by adding them
-        * to the context list directly:
+        * to whatever list we are on.
         */
        list_for_each_entry_safe(sibling, tmp, &event->sibling_list, group_entry) {
-               struct list_head *list;
-
-               list = ctx_group_list(event, ctx);
-               list_move_tail(&sibling->group_entry, list);
+               if (list)
+                       list_move_tail(&sibling->group_entry, list);
                sibling->group_leader = sibling;
 
                /* Inherit group flags from the previous leader */
@@ -720,6 +755,7 @@ static void add_event_to_ctx(struct perf_event *event,
                               struct perf_event_context *ctx)
 {
        list_add_event(event, ctx);
+       perf_group_attach(event);
        event->tstamp_enabled = ctx->time;
        event->tstamp_running = ctx->time;
        event->tstamp_stopped = ctx->time;
@@ -1874,8 +1910,8 @@ int perf_event_release_kernel(struct perf_event *event)
        WARN_ON_ONCE(ctx->parent_ctx);
        mutex_lock(&ctx->mutex);
        raw_spin_lock_irq(&ctx->lock);
+       perf_group_detach(event);
        list_del_event(event, ctx);
-       perf_destroy_group(event, ctx);
        raw_spin_unlock_irq(&ctx->lock);
        mutex_unlock(&ctx->mutex);
 
@@ -4946,6 +4982,12 @@ SYSCALL_DEFINE5(perf_event_open,
        list_add_tail(&event->owner_entry, &current->perf_event_list);
        mutex_unlock(&current->perf_event_mutex);
 
+       /*
+        * Drop the reference on the group_event after placing the
+        * new event on the sibling_list. This ensures destruction
+        * of the group leader will find the pointer to itself in
+        * perf_group_detach().
+        */
        fput_light(group_file, fput_needed);
        fd_install(event_fd, event_file);
        return event_fd;
@@ -5267,6 +5309,7 @@ static void perf_free_event(struct perf_event *event,
 
        fput(parent->filp);
 
+       perf_group_detach(event);
        list_del_event(event, ctx);
        free_event(event);
 }