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cmd/link: mark rel.ro segment as PT_GNU_RELRO

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Details: http://www.airs.com/blog/archives/189

Part of adding PIE internal linking on linux/amd64.

Change-Id: I8843a97f22f6f120346cccd694c7fff32f09f60b
Reviewed-on: https://go-review.googlesource.com/28541
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
David Crawshaw 2016-09-06 08:02:30 -04:00
parent 44ee2b00db
commit d9d1399eea
1 changed files with 13 additions and 0 deletions
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13
src/cmd/link/internal/ld/elf.go
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@ -236,6 +236,7 @@ const (
PT_LOPROC = 0x70000000 PT_LOPROC = 0x70000000
PT_HIPROC = 0x7fffffff PT_HIPROC = 0x7fffffff
PT_GNU_STACK = 0x6474e551 PT_GNU_STACK = 0x6474e551
PT_GNU_RELRO = 0x6474e552
PT_PAX_FLAGS = 0x65041580 PT_PAX_FLAGS = 0x65041580
PF_X = 0x1 PF_X = 0x1
PF_W = 0x2 PF_W = 0x2
@ -1599,6 +1600,17 @@ func elfphload(ctxt *Link, seg *Segment) *ElfPhdr {
return ph return ph
} }
func elfphrelro(ctxt *Link, seg *Segment) {
ph := newElfPhdr(ctxt)
ph.type_ = PT_GNU_RELRO
ph.vaddr = seg.Vaddr
ph.paddr = seg.Vaddr
ph.memsz = seg.Length
ph.off = seg.Fileoff
ph.filesz = seg.Filelen
ph.align = uint64(*FlagRound)
}
func elfshname(ctxt *Link, name string) *ElfShdr { func elfshname(ctxt *Link, name string) *ElfShdr {
var off int var off int
var sh *ElfShdr var sh *ElfShdr
@ -2291,6 +2303,7 @@ func Asmbelf(ctxt *Link, symo int64) {
} }
if Segrelrodata.Sect != nil { if Segrelrodata.Sect != nil {
elfphload(ctxt, &Segrelrodata) elfphload(ctxt, &Segrelrodata)
elfphrelro(ctxt, &Segrelrodata)
} }
elfphload(ctxt, &Segdata) elfphload(ctxt, &Segdata)