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cmd/link: align .reloc block starts by 32 bits for PE target

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Tweak the code that emits the PE ".reloc" section on Windows to ensure
that each relocation block is 32-bit aligned, which is required by the
PE standard.

Fixes #68260.

Change-Id: I39b75a7491b00fa97871aebb90d3be0ec09f9c40
Reviewed-on: https://go-review.googlesource.com/c/go/+/595896
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Than McIntosh 2024-07-01 16:11:33 +00:00
parent d3c93f2f00
commit f71c00b616
1 changed files with 13 additions and 0 deletions
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13
src/cmd/link/internal/ld/pe.go
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@ -1548,8 +1548,21 @@ func (rt *peBaseRelocTable) write(ctxt *Link) {
// sort the pages array
sort.Sort(rt.pages)
// .reloc section must be 32-bit aligned
if out.Offset()&3 != 0 {
Errorf(nil, "internal error, start of .reloc not 32-bit aligned")
}
for _, p := range rt.pages {
b := rt.blocks[p]
// Add a dummy entry at the end of the list if we have an
// odd number of entries, so as to ensure that the next
// block starts on a 32-bit boundary (see issue 68260).
if len(b.entries)&1 != 0 {
b.entries = append(b.entries, peBaseRelocEntry{})
}
const sizeOfPEbaseRelocBlock = 8 // 2 * sizeof(uint32)
blockSize := uint32(sizeOfPEbaseRelocBlock + len(b.entries)*2)
out.Write32(p)