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nixpkgs/pkgs/development/tools/misc/binutils/pt-pax-flags.patch

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binutils: 2.23.1 -> 2.26 There has been an abortive attempt to upgrade binutils in the past (see #909). Since we can't stay stuck at 2.23.1 forever, let's try again.
2016-02-28 00:10:35 +00:00
--- binutils-2.15.94.0.2.2.orig/bfd/elf-bfd.h 2005-02-07 20:42:44.000000000 +0100
+++ binutils-2.15.94.0.2.2/bfd/elf-bfd.h 2005-02-20 13:13:17.362558200 +0100
@@ -1266,6 +1266,9 @@
/* Should the PT_GNU_RELRO segment be emitted? */
bfd_boolean relro;
+ /* Segment flags for the PT_PAX_FLAGS segment. */
+ unsigned int pax_flags;
+
/* Symbol version definitions in external objects. */
Elf_Internal_Verdef *verdef;
--- binutils-2.17.50.0.18/bfd/elf.c.orig 2007-08-01 11:12:02.000000000 -0400
+++ binutils-2.17.50.0.18/bfd/elf.c 2007-08-01 14:27:36.086986774 -0400
@@ -1085,6 +1085,7 @@
case PT_GNU_EH_FRAME: pt = "EH_FRAME"; break;
case PT_GNU_STACK: pt = "STACK"; break;
case PT_GNU_RELRO: pt = "RELRO"; break;
+ case PT_PAX_FLAGS: pt = "PAX_FLAGS"; break;
default: pt = NULL; break;
}
return pt;
@@ -2346,6 +2347,9 @@
case PT_GNU_RELRO:
return _bfd_elf_make_section_from_phdr (abfd, hdr, hdr_index, "relro");
+ case PT_PAX_FLAGS:
+ return _bfd_elf_make_section_from_phdr (abfd, hdr, hdr_index, "pax_flags");
+
default:
/* Check for any processor-specific program segment types. */
bed = get_elf_backend_data (abfd);
@@ -3326,6 +3330,11 @@
++segs;
}
+ {
+ /* We need a PT_PAX_FLAGS segment. */
+ ++segs;
+ }
+
for (s = abfd->sections; s != NULL; s = s->next)
{
if ((s->flags & SEC_LOAD) != 0
@@ -3945,6 +3954,20 @@
pm = &m->next;
}
+ {
+ amt = sizeof (struct elf_segment_map);
+ m = bfd_zalloc (abfd, amt);
+ if (m == NULL)
+ goto error_return;
+ m->next = NULL;
+ m->p_type = PT_PAX_FLAGS;
+ m->p_flags = elf_tdata (abfd)->pax_flags;
+ m->p_flags_valid = 1;
+
+ *pm = m;
+ pm = &m->next;
+ }
+
free (sections);
elf_tdata (abfd)->segment_map = mfirst;
}
@@ -5129,7 +5152,8 @@
5. PT_GNU_STACK segments do not include any sections.
6. PT_TLS segment includes only SHF_TLS sections.
7. SHF_TLS sections are only in PT_TLS or PT_LOAD segments.
- 8. PT_DYNAMIC should not contain empty sections at the beginning
+ 8. PT_PAX_FLAGS segments do not include any sections.
+ 9. PT_DYNAMIC should not contain empty sections at the beginning
(with the possible exception of .dynamic). */
#define IS_SECTION_IN_INPUT_SEGMENT(section, segment, bed) \
((((segment->p_paddr \
@@ -5138,6 +5162,7 @@
&& (section->flags & SEC_ALLOC) != 0) \
|| IS_COREFILE_NOTE (segment, section)) \
&& segment->p_type != PT_GNU_STACK \
+ && segment->p_type != PT_PAX_FLAGS \
&& (segment->p_type != PT_TLS \
|| (section->flags & SEC_THREAD_LOCAL)) \
&& (segment->p_type == PT_LOAD \
--- binutils-2.23.52.0.1/bfd/elflink.c.orig 2013-02-27 21:28:03.000000000 +0100
+++ binutils-2.23.52.0.1/bfd/elflink.c 2013-03-01 17:32:44.922717879 +0100
@@ -5764,18 +5764,32 @@
&& ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
return FALSE;
+ elf_tdata (output_bfd)->pax_flags = PF_NORANDEXEC;
+
+ if (info->execheap)
+ elf_tdata (output_bfd)->pax_flags |= PF_NOMPROTECT;
+ else if (info->noexecheap)
+ elf_tdata (output_bfd)->pax_flags |= PF_MPROTECT;
+
/* Determine any GNU_STACK segment requirements, after the backend
has had a chance to set a default segment size. */
if (info->execstack)
+ {
elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
+ elf_tdata (output_bfd)->pax_flags |= PF_EMUTRAMP;
+ }
else if (info->noexecstack)
+ {
elf_stack_flags (output_bfd) = PF_R | PF_W;
+ elf_tdata (output_bfd)->pax_flags |= PF_NOEMUTRAMP;
+ }
else
{
bfd *inputobj;
asection *notesec = NULL;
int exec = 0;
+ elf_tdata (output_bfd)->pax_flags |= PF_NOEMUTRAMP;
for (inputobj = info->input_bfds;
inputobj;
inputobj = inputobj->link_next)
@@ -5789,7 +5803,11 @@
if (s)
{
if (s->flags & SEC_CODE)
- exec = PF_X;
+ {
+ elf_tdata (output_bfd)->pax_flags &= ~PF_NOEMUTRAMP;
+ elf_tdata (output_bfd)->pax_flags |= PF_EMUTRAMP;
+ exec = PF_X;
+ }
notesec = s;
}
else if (bed->default_execstack)
--- binutils-2.15.94.0.2.2.orig/binutils/readelf.c 2005-02-18 07:14:30.000000000 +0100
+++ binutils-2.15.94.0.2.2/binutils/readelf.c 2005-02-20 13:13:17.470541784 +0100
@@ -2293,6 +2293,7 @@
return "GNU_EH_FRAME";
case PT_GNU_STACK: return "GNU_STACK";
case PT_GNU_RELRO: return "GNU_RELRO";
+ case PT_PAX_FLAGS: return "PAX_FLAGS";
default:
if ((p_type >= PT_LOPROC) && (p_type <= PT_HIPROC))
--- binutils-2.15.94.0.2.2.orig/include/bfdlink.h 2004-11-22 21:33:32.000000000 +0100
+++ binutils-2.15.94.0.2.2/include/bfdlink.h 2005-02-20 13:13:17.476540872 +0100
@@ -313,6 +313,14 @@
flags. */
unsigned int noexecstack: 1;
+ /* TRUE if PT_PAX_FLAGS segment should be created with PF_NOMPROTECT
+ flags. */
+ unsigned int execheap: 1;
+
+ /* TRUE if PT_PAX_FLAGS segment should be created with PF_MPROTECT
+ flags. */
+ unsigned int noexecheap: 1;
+
/* TRUE if PT_GNU_RELRO segment should be created. */
unsigned int relro: 1;
--- binutils-2.15.94.0.2.2.orig/include/elf/common.h 2004-11-22 21:33:32.000000000 +0100
+++ binutils-2.15.94.0.2.2/include/elf/common.h 2005-02-20 13:13:17.482539960 +0100
@@ -423,6 +423,7 @@
#define PT_SUNW_EH_FRAME PT_GNU_EH_FRAME /* Solaris uses the same value */
#define PT_GNU_STACK (PT_LOOS + 0x474e551) /* Stack flags */
#define PT_GNU_RELRO (PT_LOOS + 0x474e552) /* Read-only after relocation */
+#define PT_PAX_FLAGS (PT_LOOS + 0x5041580) /* PaX flags */
/* Program segment permissions, in program header p_flags field. */
@@ -433,6 +434,19 @@
#define PF_MASKOS 0x0FF00000 /* New value, Oct 4, 1999 Draft */
#define PF_MASKPROC 0xF0000000 /* Processor-specific reserved bits */
+#define PF_PAGEEXEC (1 << 4) /* Enable PAGEEXEC */
+#define PF_NOPAGEEXEC (1 << 5) /* Disable PAGEEXEC */
+#define PF_SEGMEXEC (1 << 6) /* Enable SEGMEXEC */
+#define PF_NOSEGMEXEC (1 << 7) /* Disable SEGMEXEC */
+#define PF_MPROTECT (1 << 8) /* Enable MPROTECT */
+#define PF_NOMPROTECT (1 << 9) /* Disable MPROTECT */
+#define PF_RANDEXEC (1 << 10) /* Enable RANDEXEC */
+#define PF_NORANDEXEC (1 << 11) /* Disable RANDEXEC */
+#define PF_EMUTRAMP (1 << 12) /* Enable EMUTRAMP */
+#define PF_NOEMUTRAMP (1 << 13) /* Disable EMUTRAMP */
+#define PF_RANDMMAP (1 << 14) /* Enable RANDMMAP */
+#define PF_NORANDMMAP (1 << 15) /* Disable RANDMMAP */
+
/* Values for section header, sh_type field. */
#define SHT_NULL 0 /* Section header table entry unused */
--- binutils-2.18.50.0.1/ld/emultempl/elf32.em.orig 2007-09-08 19:34:12.000000000 +0200
+++ binutils-2.18.50.0.1/ld/emultempl/elf32.em 2007-09-15 21:41:35.688212063 +0200
@@ -2139,6 +2139,16 @@
link_info.noexecstack = TRUE;
link_info.execstack = FALSE;
}
+ else if (strcmp (optarg, "execheap") == 0)
+ {
+ link_info.execheap = TRUE;
+ link_info.noexecheap = FALSE;
+ }
+ else if (strcmp (optarg, "noexecheap") == 0)
+ {
+ link_info.noexecheap = TRUE;
+ link_info.execheap = FALSE;
+ }
EOF
if test -n "$COMMONPAGESIZE"; then
--- binutils-2.15.94.0.2.2.orig/ld/ldgram.y 2004-11-22 21:33:32.000000000 +0100
+++ binutils-2.15.94.0.2.2/ld/ldgram.y 2005-02-20 13:13:17.499537376 +0100
@@ -1073,6 +1073,8 @@
$$ = exp_intop (0x6474e550);
else if (strcmp (s, "PT_GNU_STACK") == 0)
$$ = exp_intop (0x6474e551);
+ else if (strcmp (s, "PT_PAX_FLAGS") == 0)
+ $$ = exp_intop (0x65041580);
else
{
einfo (_("\
--- binutils-2.26/ld/lexsup.c.orig 2015-11-13 09:27:42.000000000 +0100
+++ binutils-2.26/ld/lexsup.c 2016-01-26 21:08:41.787138458 +0100
@@ -1793,8 +1793,12 @@
fprintf (file, _("\
-z muldefs Allow multiple definitions\n"));
fprintf (file, _("\
+ -z execheap Mark executable as requiring executable heap\n"));
+ fprintf (file, _("\
-z execstack Mark executable as requiring executable stack\n"));
fprintf (file, _("\
+ -z noexecheap Mark executable as not requiring executable heap\n"));
+ fprintf (file, _("\
-z noexecstack Mark executable as not requiring executable stack\n"));
}
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