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A hand-edited object file can have a symbol name that uses newline and other normally invalid characters. The cgo tool will generate Go files containing symbol names, unquoted. That can permit those symbol names to inject Go code into a cgo-generated file. If that Go code uses the //go:cgo_ldflag pragma, it can cause the C linker to run arbitrary code when building a package. If you build an imported package we permit arbitrary code at run time, but we don't want to permit it at package build time. This CL prevents this in two ways. In cgo, reject invalid symbols that contain non-printable or space characters, or that contain anything that looks like a Go comment. In the go tool, double check all //go:cgo_ldflag directives in generated code, to make sure they follow the existing LDFLAG restrictions. Thanks to Chris Brown and Tempus Ex for reporting this. Fixes CVE-2020-28366 Change-Id: Ia1ad8f3791ea79612690fa7d26ac451d0f6df7c1 Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/895832 Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: Cherry Zhang <cherryyz@google.com> (cherry picked from commit 6bc814dd2bbfeaafa41d314dd4cc591b575dfbf6) Reviewed-on: https://team-review.git.corp.google.com/c/golang/go-private/+/901056 Reviewed-by: Filippo Valsorda <valsorda@google.com> Reviewed-by: Roland Shoemaker <bracewell@google.com> |
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