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ld: modify macho linkedit segment to enable OS X code signing

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Move string table to the end of the __LINKEDIT segment.

This change allows Apple's codesign(1) utility to successfully sign
Go binaries, as long as they don't contain DWARF data (-w flag to
8l/6l).  This is because codesign(1) expects the string table to be
the last part of the file.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5271050
This commit is contained in:
Mikkel Krautz 2011-10-18 16:31:03 -04:00 committed by Russ Cox
parent cb2f6cb05d
commit 78ad19f214
1 changed files with 12 additions and 12 deletions
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24
src/cmd/ld/macho.c
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@ -413,9 +413,9 @@ asmbmacho(void)
// must match domacholink below
s1 = lookup(".dynsym", 0);
s2 = lookup(".dynstr", 0);
s3 = lookup(".linkedit.plt", 0);
s4 = lookup(".linkedit.got", 0);
s2 = lookup(".linkedit.plt", 0);
s3 = lookup(".linkedit.got", 0);
s4 = lookup(".dynstr", 0);
ms = newMachoSeg("__LINKEDIT", 0);
ms->vaddr = va+v+rnd(segdata.len, INITRND);
@ -428,8 +428,8 @@ asmbmacho(void)
ml = newMachoLoad(2, 4); /* LC_SYMTAB */
ml->data[0] = linkoff; /* symoff */
ml->data[1] = s1->size / (macho64 ? 16 : 12); /* nsyms */
ml->data[2] = linkoff + s1->size; /* stroff */
ml->data[3] = s2->size; /* strsize */
ml->data[2] = linkoff + s1->size + s2->size + s3->size; /* stroff */
ml->data[3] = s4->size; /* strsize */
ml = newMachoLoad(11, 18); /* LC_DYSYMTAB */
ml->data[0] = 0; /* ilocalsym */
@ -444,8 +444,8 @@ asmbmacho(void)
ml->data[9] = 0; /* nmodtab */
ml->data[10] = 0; /* extrefsymoff */
ml->data[11] = 0; /* nextrefsyms */
ml->data[12] = linkoff + s1->size + s2->size; /* indirectsymoff */
ml->data[13] = (s3->size + s4->size) / 4; /* nindirectsyms */
ml->data[12] = linkoff + s1->size; /* indirectsymoff */
ml->data[13] = (s2->size + s3->size) / 4; /* nindirectsyms */
ml->data[14] = 0; /* extreloff */
ml->data[15] = 0; /* nextrel */
ml->data[16] = 0; /* locreloff */
@ -495,12 +495,12 @@ domacholink(void)
// write data that will be linkedit section
s1 = lookup(".dynsym", 0);
relocsym(s1);
s2 = lookup(".dynstr", 0);
s3 = lookup(".linkedit.plt", 0);
s4 = lookup(".linkedit.got", 0);
s2 = lookup(".linkedit.plt", 0);
s3 = lookup(".linkedit.got", 0);
s4 = lookup(".dynstr", 0);
while(s2->size%4)
adduint8(s2, 0);
while(s4->size%4)
adduint8(s4, 0);
size = s1->size + s2->size + s3->size + s4->size;