add linker patches for Go 1.23
Rebasing the Go 1.22 patches on top of Go 1.23.0, as published on https://github.com/burrowers/go-patches/pull/7. Updates #859.pull/876/head
Daniel Martí
7 months ago
parent
6e35ed3db3
commit
04df5ea4df
@ -0,0 +1,47 @@
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From a67db18d018b3626e80190cf33b5e7582b6e63cf 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 13:30:00 +0100
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Subject: [PATCH 1/3] add custom magic value
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---
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cmd/link/internal/ld/pcln.go | 17 +++++++++++++++++
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1 file changed, 17 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 57c88c03af..c09ae07e33 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 +4,10 @@
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package ld
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+import (
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+ "os"
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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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@@ -262,6 +266,19 @@ func (state *pclntab) generatePCHeader(ctxt *Link) {
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if off != size {
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panic(fmt.Sprintf("pcHeader size: %d != %d", off, size))
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}
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+
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+ // Use garble prefix in variable names to minimize collision risk
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+ garbleMagicStr := os.Getenv("GARBLE_LINK_MAGIC")
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+ if garbleMagicStr == "" {
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+ panic("[garble] magic value must be set")
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+ }
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+ var garbleMagicVal 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(garbleMagicStr, &garbleMagicVal); err != nil {
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+ panic(fmt.Errorf("[garble] invalid magic value %s: %v", garbleMagicStr, err))
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+ }
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+
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+ header.SetUint32(ctxt.Arch, 0, garbleMagicVal)
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}
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state.pcheader = state.addGeneratedSym(ctxt, "runtime.pcheader", size, writeHeader)
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--
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2.46.0
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@ -0,0 +1,85 @@
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From 05b8be787564fdcd9532e1aac5eca3ef41d4e0a1 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 | 43 +++++++++++++++++++++++++++++++++++-
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1 file changed, 42 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 c09ae07e33..056a1d3a72 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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@@ -8,6 +8,10 @@ import (
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"os"
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)
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+import (
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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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@@ -318,19 +322,56 @@ 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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2.46.0
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@ -0,0 +1,43 @@
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From 6bb03c1a0c523530b29fe6fdc48ca8f24f0bb13c 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 056a1d3a72..37226d0327 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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@@ -806,6 +806,26 @@ 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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2.46.0
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