crosstool-ng/patches/binutils/2.20/150-pt-pax-flags-20090909.patch
Yann E. MORIN" ac17b542fe config/binutils: add latest version 2.20
Also add patchset vampirised from Gentoo.
2009-10-27 20:06:46 +01:00

239 lines
8.2 KiB
Diff

--- binutils-2.20/bfd/elf-bfd.h
+++ binutils-2.20/bfd/elf-bfd.h
@@ -1527,6 +1527,9 @@ struct elf_obj_tdata
/* Segment flags for the PT_GNU_STACK segment. */
unsigned int stack_flags;
+ /* Segment flags for the PT_PAX_FLAGS segment. */
+ unsigned int pax_flags;
+
/* Symbol version definitions in external objects. */
Elf_Internal_Verdef *verdef;
--- binutils-2.20/bfd/elf.c
+++ binutils-2.20/bfd/elf.c
@@ -1081,6 +1081,7 @@ get_segment_type (unsigned int p_type)
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;
@@ -2379,6 +2380,9 @@ bfd_section_from_phdr (bfd *abfd, Elf_Internal_Phdr *hdr, int index)
case PT_GNU_RELRO:
return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "relro");
+ case PT_PAX_FLAGS:
+ return _bfd_elf_make_section_from_phdr (abfd, hdr, index, "pax_flags");
+
default:
/* Check for any processor-specific program segment types. */
bed = get_elf_backend_data (abfd);
@@ -3393,6 +3397,11 @@ get_program_header_size (bfd *abfd, struct bfd_link_info *info)
++segs;
}
+ {
+ /* We need a PT_PAX_FLAGS segment. */
+ ++segs;
+ }
+
for (s = abfd->sections; s != NULL; s = s->next)
{
if ((s->flags & SEC_LOAD) != 0
@@ -3972,6 +3981,20 @@ _bfd_elf_map_sections_to_segments (bfd *abfd, struct bfd_link_info *info)
}
}
+ {
+ 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;
}
@@ -5176,7 +5199,8 @@ rewrite_elf_program_header (bfd *ibfd, bfd *obfd)
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
- (with the possible exception of .dynamic). */
+ (with the possible exception of .dynamic).
+ 9. PT_PAX_FLAGS segments do not include any sections. */
#define IS_SECTION_IN_INPUT_SEGMENT(section, segment, bed) \
((((segment->p_paddr \
? IS_CONTAINED_BY_LMA (section, segment, segment->p_paddr) \
@@ -5184,6 +5208,7 @@ rewrite_elf_program_header (bfd *ibfd, bfd *obfd)
&& (section->flags & SEC_ALLOC) != 0) \
|| IS_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-2.20/bfd/elflink.c
+++ binutils-2.20/bfd/elflink.c
@@ -5465,16 +5465,30 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
return TRUE;
bed = get_elf_backend_data (output_bfd);
+
+ 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;
+
if (info->execstack)
- elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
+ {
+ elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
+ elf_tdata (output_bfd)->pax_flags |= PF_EMUTRAMP;
+ }
else if (info->noexecstack)
- elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
+ {
+ elf_tdata (output_bfd)->stack_flags = 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)
@@ -5487,7 +5501,11 @@ bfd_elf_size_dynamic_sections (bfd *output_bfd,
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-2.20/binutils/readelf.c
+++ binutils-2.20/binutils/readelf.c
@@ -2556,6 +2556,7 @@ get_segment_type (unsigned long p_type)
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-2.20/include/bfdlink.h
+++ binutils-2.20/include/bfdlink.h
@@ -319,6 +319,14 @@ struct bfd_link_info
/* TRUE if PT_GNU_RELRO segment should be created. */
unsigned int relro: 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 we should warn when adding a DT_TEXTREL to a shared object. */
unsigned int warn_shared_textrel: 1;
--- binutils-2.20/include/elf/common.h
+++ binutils-2.20/include/elf/common.h
@@ -422,6 +422,7 @@
#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. */
@@ -432,6 +433,21 @@
#define PF_MASKOS 0x0FF00000 /* New value, Oct 4, 1999 Draft */
#define PF_MASKPROC 0xF0000000 /* Processor-specific reserved bits */
+/* Flags to control PaX behavior. */
+
+#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-2.20/ld/emultempl/elf32.em
+++ binutils-2.20/ld/emultempl/elf32.em
@@ -2159,6 +2159,16 @@ fragment <<EOF
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 "$COMMONPAGESIZE"; then
@@ -2237,6 +2247,8 @@ fragment <<EOF
fprintf (file, _("\
-z execstack Mark executable as requiring executable stack\n"));
fprintf (file, _("\
+ -z execheap Mark executable as requiring executable heap\n"));
+ fprintf (file, _("\
-z initfirst Mark DSO to be initialized first at runtime\n"));
fprintf (file, _("\
-z interpose Mark object to interpose all DSOs but executable\n"));
@@ -2260,6 +2272,8 @@ fragment <<EOF
-z nodump Mark DSO not available to dldump\n"));
fprintf (file, _("\
-z noexecstack Mark executable as not requiring executable stack\n"));
+ fprintf (file, _("\
+ -z noexecheap Mark executable as not requiring executable heap\n"));
EOF
if test -n "$COMMONPAGESIZE"; then
--- binutils-2.20/ld/ldgram.y
+++ binutils-2.20/ld/ldgram.y
@@ -1116,6 +1116,8 @@ phdr_type:
$$ = exp_intop (0x6474e550);
else if (strcmp (s, "PT_GNU_STACK") == 0)
$$ = exp_intop (0x6474e551);
+ else if (strcmp (s, "PT_PAX_FLAGS") == 0)
+ $$ = exp_intop (0x65041580);
else
{
einfo (_("\