perf/core: Fix event inheritance on fork()

commit e7cc4865f0f31698ef2f7aac01a50e78968985b7 upstream.

While hunting for clues to a use-after-free, Oleg spotted that
perf_event_init_context() can loose an error value with the result
that fork() can succeed even though we did not fully inherit the perf
event context.

Spotted-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: oleg@redhat.com
Fixes: 889ff0150661 ("perf/core: Split context's event group list into pinned and non-pinned lists")
Link: http://lkml.kernel.org/r/20170316125823.190342547@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 49a1db4..cd4f88a 100644 (file)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7273,7 +7273,7 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
                ret = inherit_task_group(event, parent, parent_ctx,
                                         child, ctxn, &inherited_all);
                if (ret)
-                       break;
+                       goto out_unlock;
        }
 
        /*
@@ -7289,7 +7289,7 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
                ret = inherit_task_group(event, parent, parent_ctx,
                                         child, ctxn, &inherited_all);
                if (ret)
-                       break;
+                       goto out_unlock;
        }
 
        raw_spin_lock_irqsave(&parent_ctx->lock, flags);
@@ -7317,6 +7317,7 @@ int perf_event_init_context(struct task_struct *child, int ctxn)
        }
 
        raw_spin_unlock_irqrestore(&parent_ctx->lock, flags);
+out_unlock:
        mutex_unlock(&parent_ctx->mutex);
 
        perf_unpin_context(parent_ctx);