[PATCH V4 3/8] bfd: fix recognition of arch-specific augmentations

[Jose E. Marchesi]

This patch fixes _bfd_elf_parse_eh_frame so it will not recognize
machine/architecture specific augmentation characters in EH Frame
CFIs.

Regtested in x86_64-linux-gnu and aarch64-linux-gnu.

bfd/ChangeLog:

	* elf-eh-frame.c (_bfd_elf_parse_eh_frame): Recognize augmentation
	'B' only if targetting aarch64.
---
 bfd/elf-eh-frame.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c
index 0250a8f8d11..ce17f715caa 100644
--- a/bfd/elf-eh-frame.c
+++ b/bfd/elf-eh-frame.c
@@ -802,6 +802,8 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info,
 		switch (*aug++)
 		  {
 		  case 'B':
+                    if (abfd->arch_info->arch != bfd_arch_aarch64)
+                      goto unrecognized;
 		    break;
 		  case 'L':
 		    REQUIRE (read_byte (&buf, end, &cie->lsda_encoding));
@@ -843,6 +845,7 @@ _bfd_elf_parse_eh_frame (bfd *abfd, struct bfd_link_info *info,
 		      REQUIRE (skip_bytes (&buf, end, per_width));
 		    }
 		    break;
+                  unrecognized:
 		  default:
 		    /* Unrecognized augmentation. Better bail out.  */
 		    goto free_no_table;
-- 
2.30.2