Lasse Folger 3992ea83a2 all: implement depth limit for unmarshaling ... + This change introduce a default and configurable depth limit for proto.Unmarshal. If a message is nested deeper than the limit, unmarshaling will fail. There are two ways to nest messages. Either by having fields which are message types itself or by using groups. + The default limit is 10,000 for now. This might change in the future to align it with other language implementation (C++ and Java use 100 as limit). + If pure groups (groups that don't contain message fields) are nested deeper than the default limit the unmarshaling fails with: proto: cannot parse invalid wire-format data + Note: the configured limit does not apply to pure groups. + This change is introduced to improve security and robustness. Because unmarshaling is implemented using recursion it can lead to stack overflows for certain inputs. The introduced limit protects against this. + A secondary motivation for this limit is the alignment with other languages. Protocol buffers are a language interoperability mechanism and thus either all implementations should accept the input or all implementation should reject the input. Change-Id: I14bdb44d06e4bd1aa90d6336c2cf6446003b2037 Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/385854 Trust: Dmitri Shuralyov <dmitshur@golang.org> Reviewed-by: Damien Neil <dneil@google.com> Trust: Damien Neil <dneil@google.com> Reviewed-by: Nicolas Hillegeer <aktau@google.com> Reviewed-by: Chressie Himpel <chressie@google.com>		2022-02-17 17:07:31 +00:00
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wire_test.go	encoding/protowire: make package publicly available	2020-03-20 07:42:18 +00:00
wire.go	all: implement depth limit for unmarshaling	2022-02-17 17:07:31 +00:00