debug: add top level security docs for dwarf, elf, macho, pe, and plan9obj

Adds a package level doc comment to the debug/dwarf, debug/elf,
debug/macho, debug/pe, and debug/plan9obj noting that these packages
are not designed to be hardened against adversarial inputs.

Change-Id: I678d01bcdc8ad01c23805f09cc59e64cec6c3f76
Reviewed-on: https://go-review.googlesource.com/c/go/+/435417
Reviewed-by: Damien Neil <dneil@google.com>
Reviewed-by: Julie Qiu <julieqiu@google.com>
Run-TryBot: Roland Shoemaker <roland@golang.org>
Auto-Submit: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

src/debug/dwarf/open.go

@@ -2,9 +2,19 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package dwarf provides access to DWARF debugging information loaded from
-// executable files, as defined in the DWARF 2.0 Standard at
-// http://dwarfstd.org/doc/dwarf-2.0.0.pdf
+/*
+Package dwarf provides access to DWARF debugging information loaded from
+executable files, as defined in the DWARF 2.0 Standard at
+http://dwarfstd.org/doc/dwarf-2.0.0.pdf.
+
+# Security
+
+This package is not designed to be hardened against adversarial inputs, and is
+outside the scope of https://go.dev/security/policy. In particular, only basic
+validation is done when parsing object files. As such, care should be taken when
+parsing untrusted inputs, as parsing malformed files may consume significant
+resources, or cause panics.
+*/
 package dwarf
 
 import (

src/debug/elf/file.go

@@ -2,7 +2,17 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package elf implements access to ELF object files.
+/*
+Package elf implements access to ELF object files.
+
+# Security
+
+This package is not designed to be hardened against adversarial inputs, and is
+outside the scope of https://go.dev/security/policy. In particular, only basic
+validation is done when parsing object files. As such, care should be taken when
+parsing untrusted inputs, as parsing malformed files may consume significant
+resources, or cause panics.
+*/
 package elf
 
 import (

src/debug/macho/file.go

@@ -2,7 +2,17 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package macho implements access to Mach-O object files.
+/*
+Package macho implements access to Mach-O object files.
+
+# Security
+
+This package is not designed to be hardened against adversarial inputs, and is
+outside the scope of https://go.dev/security/policy. In particular, only basic
+validation is done when parsing object files. As such, care should be taken when
+parsing untrusted inputs, as parsing malformed files may consume significant
+resources, or cause panics.
+*/
 package macho
 
 // High level access to low level data structures.

src/debug/pe/file.go

@@ -2,7 +2,17 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package pe implements access to PE (Microsoft Windows Portable Executable) files.
+/*
+Package pe implements access to PE (Microsoft Windows Portable Executable) files.
+
+# Security
+
+This package is not designed to be hardened against adversarial inputs, and is
+outside the scope of https://go.dev/security/policy. In particular, only basic
+validation is done when parsing object files. As such, care should be taken when
+parsing untrusted inputs, as parsing malformed files may consume significant
+resources, or cause panics.
+*/
 package pe
 
 import (

src/debug/plan9obj/file.go

@@ -2,7 +2,17 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package plan9obj implements access to Plan 9 a.out object files.
+/*
+Package plan9obj implements access to Plan 9 a.out object files.
+
+# Security
+
+This package is not designed to be hardened against adversarial inputs, and is
+outside the scope of https://go.dev/security/policy. In particular, only basic
+validation is done when parsing object files. As such, care should be taken when
+parsing untrusted inputs, as parsing malformed files may consume significant
+resources, or cause panics.
+*/
 package plan9obj
 
 import (