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44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
From b5524a7c84a994b43027723b4bb05441db365a1e Mon Sep 17 00:00:00 2001
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From: pagran <pagran@protonmail.com>
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Date: Sat, 14 Jan 2023 21:36:16 +0100
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Subject: [PATCH 3/3] add entryOff encryption
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---
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cmd/link/internal/ld/pcln.go | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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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 8b670135de..e4ccfc9330 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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@@ -779,6 +779,26 @@ func writeFuncs(ctxt *Link, sb *loader.SymbolBuilder, funcs []loader.Sym, inlSym
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sb.SetUint32(ctxt.Arch, dataoff, uint32(ldr.SymValue(fdsym)-gofuncBase))
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}
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}
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+
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+ // Moving next code higher is not recommended.
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+ // Only at the end of the current function no edits between go versions
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+ garbleEntryOffKeyStr := os.Getenv("GARBLE_LINK_ENTRYOFF_KEY")
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+ if garbleEntryOffKeyStr == "" {
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+ panic("[garble] entryOff key must be set")
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+ }
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+ var garbleEntryOffKey uint32
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+ // Use fmt package instead of strconv to avoid importing a new package
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+ if _, err := fmt.Sscan(garbleEntryOffKeyStr, &garbleEntryOffKey); err != nil {
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+ panic(fmt.Errorf("[garble] invalid entryOff key %s: %v", garbleEntryOffKeyStr, err))
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+ }
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+
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+ garbleData := sb.Data()
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+ for _, off := range startLocations {
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+ entryOff := ctxt.Arch.ByteOrder.Uint32(garbleData[off:])
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+ nameOff := ctxt.Arch.ByteOrder.Uint32(garbleData[off+4:])
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+
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+ sb.SetUint32(ctxt.Arch, int64(off), entryOff^(nameOff*garbleEntryOffKey))
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+ }
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}
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// pclntab initializes the pclntab symbol with
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--
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2.40.1
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