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Diffstat (limited to 'patches/binutils/2.20/150-pt-pax-flags-20090909.patch')
-rw-r--r--patches/binutils/2.20/150-pt-pax-flags-20090909.patch238
1 files changed, 238 insertions, 0 deletions
diff --git a/patches/binutils/2.20/150-pt-pax-flags-20090909.patch b/patches/binutils/2.20/150-pt-pax-flags-20090909.patch
new file mode 100644
index 0000000..f0a9905
--- /dev/null
+++ b/patches/binutils/2.20/150-pt-pax-flags-20090909.patch
@@ -0,0 +1,238 @@
+--- 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 (_("\