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87 lines
2.4 KiB
Diff
87 lines
2.4 KiB
Diff
From 1e3895a863cb122b8262b5bf51a2984998f0fd3e Mon Sep 17 00:00:00 2001
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From: pagran <pagran@protonmail.com>
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Date: Mon, 9 Jan 2023 13:30:36 +0100
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Subject: [PATCH 2/3] add unexported function name removing
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---
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cmd/link/internal/ld/pcln.go | 44 +++++++++++++++++++++++++++++++++++-
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1 file changed, 43 insertions(+), 1 deletion(-)
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diff --git a/cmd/link/internal/ld/pcln.go b/cmd/link/internal/ld/pcln.go
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index e93532e510..8b670135de 100644
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--- a/cmd/link/internal/ld/pcln.go
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+++ b/cmd/link/internal/ld/pcln.go
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@@ -4,6 +4,11 @@
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package ld
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+import (
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+ "strings"
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+ "unicode"
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+)
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+
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import (
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"cmd/internal/goobj"
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"cmd/internal/objabi"
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@@ -301,19 +306,56 @@ func walkFuncs(ctxt *Link, funcs []loader.Sym, f func(loader.Sym)) {
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func (state *pclntab) generateFuncnametab(ctxt *Link, funcs []loader.Sym) map[loader.Sym]uint32 {
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nameOffsets := make(map[loader.Sym]uint32, state.nfunc)
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+ garbleTiny := os.Getenv("GARBLE_LINK_TINY") == "true"
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+
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// Write the null terminated strings.
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writeFuncNameTab := func(ctxt *Link, s loader.Sym) {
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symtab := ctxt.loader.MakeSymbolUpdater(s)
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+ if garbleTiny {
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+ symtab.AddStringAt(0, "")
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+ }
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+
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for s, off := range nameOffsets {
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+ if garbleTiny && off == 0 {
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+ continue
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+ }
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symtab.AddCStringAt(int64(off), ctxt.loader.SymName(s))
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}
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}
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// Loop through the CUs, and calculate the size needed.
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var size int64
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+
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+ if garbleTiny {
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+ size = 1 // first byte is reserved for empty string used for all non-exportable method names
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+ }
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+ // Kinds of SymNames found in the wild:
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+ //
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+ // * reflect.Value.CanAddr
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+ // * reflect.(*Value).String
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+ // * reflect.w6cEoKc
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+ // * internal/abi.(*RegArgs).IntRegArgAddr
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+ // * type:.eq.runtime.special
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+ // * runtime/internal/atomic.(*Pointer[go.shape.string]).Store
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+ //
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+ // Checking whether the first rune after the last dot is uppercase seems enough.
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+ isExported := func(name string) bool {
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+ for _, r := range name[strings.LastIndexByte(name, '.')+1:] {
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+ return unicode.IsUpper(r)
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+ }
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+ return false
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+ }
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+
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walkFuncs(ctxt, funcs, func(s loader.Sym) {
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+ name := ctxt.loader.SymName(s)
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+
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+ if garbleTiny && !isExported(name) {
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+ nameOffsets[s] = 0 // redirect name to empty string
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+ return
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+ }
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+
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nameOffsets[s] = uint32(size)
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- size += int64(len(ctxt.loader.SymName(s)) + 1) // NULL terminate
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+ size += int64(len(name) + 1) // NULL terminate
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})
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state.funcnametab = state.addGeneratedSym(ctxt, "runtime.funcnametab", size, writeFuncNameTab)
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--
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2.40.1
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