x86: don't request useless overflow checking

Relocations with a bitsize matching the architecture's address width
can't usefully use an overflow checking approach other than "dont" or
"signed": All others involve perhaps complex calculations in
_bfd_relocate_contents() (or, not as severe, in bfd_check_overflow())
without ever finding anything to complain about - because of the address
width masking applied. Avoid this unnecessary overhead and switch all
such reloc types to "dont".

Note that "signed" checking with rela relocations (i.e. x86-64 here) is
only going to be useful if the addend actually got passed to
_bfd_relocate_contents() (and maybe others) instead of bogusly adding in
prior section contents (which apparently is assumed to be zero, and
hence again no overflow would ever be detected). See
https://sourceware.org/pipermail/binutils/2021-April/116164.html.

1 files changed, 27 insertions, 27 deletions

diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c
index ffe764422ff..4451f9b451c 100644
--- a/bfd/elf32-i386.c
+++ b/bfd/elf32-i386.c
@@ -33,34 +33,34 @@ static reloc_howto_type elf_howto_table[]=
   HOWTO(R_386_NONE, 0, 3, 0, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_NONE",
 	true, 0x00000000, 0x00000000, false),
-  HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_bitfield,
+  HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_PC32",
 	true, 0xffffffff, 0xffffffff, true),
-  HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_GOT32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_bitfield,
+  HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_PLT32",
 	true, 0xffffffff, 0xffffffff, true),
-  HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_COPY",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_GLOB_DAT",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_RELATIVE",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_GOTOFF",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_bitfield,
+  HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_GOTPC",
 	true, 0xffffffff, 0xffffffff, true),
 
@@ -72,22 +72,22 @@ static reloc_howto_type elf_howto_table[]=
 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
 
   /* These relocs are a GNU extension.  */
-  HOWTO(R_386_TLS_TPOFF, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_TPOFF, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_IE, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_IE, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_IE",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_GOTIE, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_GOTIE, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_LE, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_LE, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_LE",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_GD, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_GD, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_GD",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_LDM, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_LDM, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_LDM",
 	true, 0xffffffff, 0xffffffff, false),
   HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
@@ -106,40 +106,40 @@ static reloc_howto_type elf_howto_table[]=
 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
   /* These are common with Solaris TLS implementation.  */
-  HOWTO(R_386_TLS_LDO_32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_LDO_32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_IE_32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_IE_32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_IE_32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_LE_32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_LE_32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_LE_32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_SIZE32, 0, 2, 32, false, 0, complain_overflow_unsigned,
+  HOWTO(R_386_SIZE32, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_SIZE32",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
 	true, 0xffffffff, 0xffffffff, false),
   HOWTO(R_386_TLS_DESC_CALL, 0, 3, 0, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
 	false, 0, 0, false),
-  HOWTO(R_386_TLS_DESC, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_TLS_DESC, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_TLS_DESC",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_IRELATIVE, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_IRELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_IRELATIVE",
 	true, 0xffffffff, 0xffffffff, false),
-  HOWTO(R_386_GOT32X, 0, 2, 32, false, 0, complain_overflow_bitfield,
+  HOWTO(R_386_GOT32X, 0, 2, 32, false, 0, complain_overflow_dont,
 	bfd_elf_generic_reloc, "R_386_GOT32X",
 	true, 0xffffffff, 0xffffffff, false),