aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--bfd/ChangeLog12
-rw-r--r--bfd/elf64-x86-64.c133
-rw-r--r--bfd/elfxx-x86.h7
-rw-r--r--ld/ChangeLog8
-rw-r--r--ld/testsuite/ld-x86-64/pr24151a-x32.d4
-rw-r--r--ld/testsuite/ld-x86-64/pr24151a.d3
-rw-r--r--ld/testsuite/ld-x86-64/pr24151a.s9
-rw-r--r--ld/testsuite/ld-x86-64/x86-64.exp2
8 files changed, 124 insertions, 54 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 5547cd2..22eab1e 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,15 @@
+2019-02-05 H.J. Lu <hongjiu.lu@intel.com>
+
+ PR ld/24151
+ * elf64-x86-64.c (elf_x86_64_need_pic): Check
+ SYMBOL_DEFINED_NON_SHARED_P instead of def_regular.
+ (elf_x86_64_relocate_section): Move PIC check for PC-relative
+ relocations to ...
+ (elf_x86_64_check_relocs): Here.
+ (elf_x86_64_finish_dynamic_symbol): Use SYMBOL_DEFINED_NON_SHARED_P
+ to check if a symbol is defined in a non-shared object.
+ * elfxx-x86.h (SYMBOL_DEFINED_NON_SHARED_P): New.
+
2019-01-21 Sergio Durigan Junior <sergiodj@redhat.com>
* elf32-arm.c (elf32_arm_final_link_relocate): Use 'llabs' instead
diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c
index c7d8bca..6a4b366 100644
--- a/bfd/elf64-x86-64.c
+++ b/bfd/elf64-x86-64.c
@@ -1426,7 +1426,7 @@ elf_x86_64_need_pic (struct bfd_link_info *info,
break;
}
- if (!h->def_regular && !h->def_dynamic)
+ if (!SYMBOL_DEFINED_NON_SHARED_P (h) && !h->def_dynamic)
und = _("undefined ");
}
else
@@ -1855,6 +1855,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
const char *name;
bfd_boolean size_reloc;
bfd_boolean converted_reloc;
+ bfd_boolean do_check_pic;
r_symndx = htab->r_sym (rel->r_info);
r_type = ELF32_R_TYPE (rel->r_info);
@@ -2130,6 +2131,13 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
size_reloc = TRUE;
goto do_size;
+ case R_X86_64_PC8:
+ case R_X86_64_PC16:
+ case R_X86_64_PC32:
+ case R_X86_64_PC32_BND:
+ do_check_pic = TRUE;
+ goto check_pic;
+
case R_X86_64_32:
if (!ABI_64_P (abfd))
goto pointer;
@@ -2153,13 +2161,11 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
&x86_64_elf_howto_table[r_type]);
/* Fall through. */
- case R_X86_64_PC8:
- case R_X86_64_PC16:
- case R_X86_64_PC32:
- case R_X86_64_PC32_BND:
case R_X86_64_PC64:
case R_X86_64_64:
pointer:
+ do_check_pic = FALSE;
+check_pic:
if (eh != NULL && (sec->flags & SEC_CODE) != 0)
eh->zero_undefweak |= 0x2;
/* We are called after all symbols have been resolved. Only
@@ -2223,6 +2229,67 @@ pointer:
}
}
+ if (do_check_pic)
+ {
+ /* Don't complain about -fPIC if the symbol is undefined
+ when building executable unless it is unresolved weak
+ symbol, references a dynamic definition in PIE or
+ -z nocopyreloc is used. */
+ bfd_boolean no_copyreloc_p
+ = (info->nocopyreloc
+ || (h != NULL
+ && eh->def_protected
+ && elf_has_no_copy_on_protected (h->root.u.def.section->owner)));
+ if ((sec->flags & SEC_ALLOC) != 0
+ && (sec->flags & SEC_READONLY) != 0
+ && h != NULL
+ && ((bfd_link_executable (info)
+ && ((h->root.type == bfd_link_hash_undefweak
+ && (eh == NULL
+ || !UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
+ eh)))
+ || (bfd_link_pie (info)
+ && !SYMBOL_DEFINED_NON_SHARED_P (h)
+ && h->def_dynamic)
+ || (no_copyreloc_p
+ && h->def_dynamic
+ && !(h->root.u.def.section->flags & SEC_CODE))))
+ || bfd_link_dll (info)))
+ {
+ bfd_boolean fail = FALSE;
+ if (SYMBOL_REFERENCES_LOCAL_P (info, h))
+ {
+ /* Symbol is referenced locally. Make sure it is
+ defined locally. */
+ fail = !SYMBOL_DEFINED_NON_SHARED_P (h);
+ }
+ else if (bfd_link_pie (info))
+ {
+ /* We can only use PC-relative relocations in PIE
+ from non-code sections. */
+ if (h->type == STT_FUNC
+ && (sec->flags & SEC_CODE) != 0)
+ fail = TRUE;
+ }
+ else if (no_copyreloc_p || bfd_link_dll (info))
+ {
+ /* Symbol doesn't need copy reloc and isn't
+ referenced locally. Don't allow PC-relative
+ relocations against default and protected
+ symbols since address of protected function
+ and location of protected data may not be in
+ the shared object. */
+ fail = (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+ || ELF_ST_VISIBILITY (h->other) == STV_PROTECTED);
+ }
+
+ if (fail)
+ return elf_x86_64_need_pic (info, abfd, sec, h,
+ symtab_hdr, isym,
+ &x86_64_elf_howto_table[r_type]);
+ }
+ }
+
size_reloc = FALSE;
do_size:
if (NEED_DYNAMIC_RELOCATION_P (info, TRUE, h, sec, r_type,
@@ -3065,56 +3132,14 @@ use_plt:
case R_X86_64_PC16:
case R_X86_64_PC32:
case R_X86_64_PC32_BND:
- /* Don't complain about -fPIC if the symbol is undefined when
- building executable unless it is unresolved weak symbol,
- references a dynamic definition in PIE or -z nocopyreloc
- is used. */
- if ((input_section->flags & SEC_ALLOC) != 0
- && (input_section->flags & SEC_READONLY) != 0
- && h != NULL
- && ((bfd_link_executable (info)
- && ((h->root.type == bfd_link_hash_undefweak
- && !resolved_to_zero)
- || (bfd_link_pie (info)
- && !h->def_regular
- && h->def_dynamic)
- || ((info->nocopyreloc
- || (eh->def_protected
- && elf_has_no_copy_on_protected (h->root.u.def.section->owner)))
- && h->def_dynamic
- && !(h->root.u.def.section->flags & SEC_CODE))))
- || bfd_link_dll (info)))
- {
- bfd_boolean fail = FALSE;
- if (SYMBOL_REFERENCES_LOCAL_P (info, h))
- {
- /* Symbol is referenced locally. Make sure it is
- defined locally. */
- fail = !(h->def_regular || ELF_COMMON_DEF_P (h));
- }
- else if (!(bfd_link_pie (info)
- && (h->needs_copy || eh->needs_copy)))
- {
- /* Symbol doesn't need copy reloc and isn't referenced
- locally. Address of protected function may not be
- reachable at run-time. */
- fail = (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
- || (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED
- && h->type == STT_FUNC));
- }
-
- if (fail)
- return elf_x86_64_need_pic (info, input_bfd, input_section,
- h, NULL, NULL, howto);
- }
/* Since x86-64 has PC-relative PLT, we can use PLT in PIE
as function address. */
- else if (h != NULL
- && (input_section->flags & SEC_CODE) == 0
- && bfd_link_pie (info)
- && h->type == STT_FUNC
- && !h->def_regular
- && h->def_dynamic)
+ if (h != NULL
+ && (input_section->flags & SEC_CODE) == 0
+ && bfd_link_pie (info)
+ && h->type == STT_FUNC
+ && !h->def_regular
+ && h->def_dynamic)
goto use_plt;
/* Fall through. */
@@ -4271,7 +4296,7 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
else if (bfd_link_pic (info)
&& SYMBOL_REFERENCES_LOCAL_P (info, h))
{
- if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
+ if (!SYMBOL_DEFINED_NON_SHARED_P (h))
return FALSE;
BFD_ASSERT((h->got.offset & 1) != 0);
rela.r_info = htab->r_info (0, R_X86_64_RELATIVE);
diff --git a/bfd/elfxx-x86.h b/bfd/elfxx-x86.h
index dce24dc..28d540b 100644
--- a/bfd/elfxx-x86.h
+++ b/bfd/elfxx-x86.h
@@ -161,6 +161,13 @@
|| (ELF_ST_VISIBILITY ((H)->other) \
&& (H)->root.type == bfd_link_hash_undefweak))
+/* TRUE if this symbol isn't defined by a shared object. */
+#define SYMBOL_DEFINED_NON_SHARED_P(H) \
+ ((H)->def_regular \
+ || (H)->root.linker_def \
+ || (H)->root.ldscript_def \
+ || ELF_COMMON_DEF_P (H))
+
/* TRUE if relative relocation should be generated. GOT reference to
global symbol in PIC will lead to dynamic symbol. It becomes a
problem when "time" or "times" is defined as a variable in an
diff --git a/ld/ChangeLog b/ld/ChangeLog
index 5713b00..262f7bf 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,11 @@
+2019-02-05 H.J. Lu <hongjiu.lu@intel.com>
+
+ PR ld/24151
+ * testsuite/ld-x86-64/pr24151a-x32.d: New file.
+ * testsuite/ld-x86-64/pr24151a.d: Likewise.
+ * testsuite/ld-x86-64/pr24151a.s: Likewise.
+ * testsuite/ld-x86-64/x86-64.exp: Run pr24151a and pr24151a-x32.
+
2019-01-31 Alan Modra <amodra@gmail.com>
* NEWS: Mention -t change.
diff --git a/ld/testsuite/ld-x86-64/pr24151a-x32.d b/ld/testsuite/ld-x86-64/pr24151a-x32.d
new file mode 100644
index 0000000..130611d
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr24151a-x32.d
@@ -0,0 +1,4 @@
+#source: pr24151a.s
+#as: --x32
+#ld: -shared -melf32_x86_64
+#error: .*relocation R_X86_64_PC32 against protected symbol `foo' can not be used when making a shared object
diff --git a/ld/testsuite/ld-x86-64/pr24151a.d b/ld/testsuite/ld-x86-64/pr24151a.d
new file mode 100644
index 0000000..783b85a
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr24151a.d
@@ -0,0 +1,3 @@
+#as: --64
+#ld: -shared -melf_x86_64
+#error: .*relocation R_X86_64_PC32 against protected symbol `foo' can not be used when making a shared object
diff --git a/ld/testsuite/ld-x86-64/pr24151a.s b/ld/testsuite/ld-x86-64/pr24151a.s
new file mode 100644
index 0000000..e4ec7c8
--- /dev/null
+++ b/ld/testsuite/ld-x86-64/pr24151a.s
@@ -0,0 +1,9 @@
+ .text
+ .globl bar
+ .type bar,@function
+bar:
+ movl $30, foo(%rip)
+ .size bar, .-bar
+ .protected foo
+ .type foo,@object
+ .comm foo,4,4
diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp
index 86b163f..5eb5565 100644
--- a/ld/testsuite/ld-x86-64/x86-64.exp
+++ b/ld/testsuite/ld-x86-64/x86-64.exp
@@ -424,6 +424,8 @@ run_dump_test "pr23486d-x32"
run_dump_test "pr23854"
run_dump_test "pr23930"
run_dump_test "pr23930-x32"
+run_dump_test "pr24151a"
+run_dump_test "pr24151a-x32"
if { ![istarget "x86_64-*-linux*"] && ![istarget "x86_64-*-nacl*"]} {
return
generated by cgit v1.1 at 2024-12-12 07:56:05 +0000