Merge branch 'hasse/kernel/limit_crash_reports/OTP-14417'

* hasse/kernel/limit_crash_reports/OTP-14417:
  stdlib: Limit the size of gen_statem's error events
  kernel: Introcude error_logger:get_format_depth()
  stdlib: Limit the size of proc_lib's crash reports
  stdlib: Limit the size of gen_server's error events
  kernel: Add error_logger:limit_term/1
  stdlib: Add io_lib:limit_term/2

2 files changed, 34 insertions, 1 deletions

diff --git a/lib/kernel/doc/src/error_logger.xml b/lib/kernel/doc/src/error_logger.xml
index 814e8eac46..27db00819f 100644
--- a/lib/kernel/doc/src/error_logger.xml
+++ b/lib/kernel/doc/src/error_logger.xml
@@ -4,7 +4,7 @@
 <erlref>
   <header>
     <copyright>
-      <year>1996</year><year>2016</year>
+      <year>1996</year><year>2017</year>
       <holder>Ericsson AB. All Rights Reserved.</holder>
     </copyright>
     <legalnotice>
@@ -163,6 +163,19 @@ ok</pre>
       </desc>
     </func>
     <func>
+      <name name="get_format_depth" arity="0"/>
+      <fsummary>Get the value of the Kernel application variable
+                <c>error_logger_format_depth</c>.</fsummary>
+      <desc>
+	<p>Returns <c>max(10, Depth)</c>, where <c>Depth</c> is the
+	value of
+	<seealso marker="kernel:kernel_app#error_logger_format_depth">
+	error_logger_format_depth</seealso>
+	in the Kernel application, if Depth is an integer. Otherwise,
+	<c>unlimited</c> is returned.</p>
+      </desc>
+    </func>
+    <func>
       <name name="info_msg" arity="1"/>
       <name name="info_msg" arity="2"/>
       <fsummary>Send a standard information event to the error logger.</fsummary>
diff --git a/lib/kernel/src/error_logger.erl b/lib/kernel/src/error_logger.erl
index 81f1bf8d97..9bf8547745 100644
--- a/lib/kernel/src/error_logger.erl
+++ b/lib/kernel/src/error_logger.erl
@@ -31,6 +31,8 @@
 	 handle_event/2, handle_call/2, handle_info/2,
 	 terminate/2]).
 
+-export([get_format_depth/0, limit_term/1]).
+
 -define(buffer_size, 10).
 
 %%-----------------------------------------------------------------
@@ -518,3 +520,21 @@ string_p1([H|T]) when is_list(H) ->
     end;
 string_p1([]) -> true;
 string_p1(_) ->  false.
+
+-spec limit_term(term()) -> term().
+
+limit_term(Term) ->
+    case get_format_depth() of
+        unlimited -> Term;
+        D -> io_lib:limit_term(Term, D)
+    end.
+
+-spec get_format_depth() -> 'unlimited' | pos_integer().
+
+get_format_depth() ->
+    case application:get_env(kernel, error_logger_format_depth) of
+	{ok, Depth} when is_integer(Depth) ->
+	    max(10, Depth);
+	undefined ->
+	    unlimited
+    end.