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authorAlan Modra <amodra@gmail.com>2020-09-01 08:59:05 +0930
committerAlan Modra <amodra@gmail.com>2020-09-01 16:02:48 +0930
commitf911bb2201c5642151d06622e6ad3d20d5d8cc7b (patch)
tree92118da533f94edc63a381d4b7f00a2c9b953544 /bfd/elf32-arm.c
parent00c91124d44f799a4fb9cd45a0ef44dc47ab1b1a (diff)
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PR26429 UBSAN: elf32-arm.c load /store misaligned address
PR 26429 * elf32-arm.c (elf32_arm_allocate_local_sym_info): Allocate arrays in descending order of alignment.
Diffstat (limited to 'bfd/elf32-arm.c')
-rw-r--r--bfd/elf32-arm.c29
1 files changed, 21 insertions, 8 deletions
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 4366b76..6202695 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -3593,27 +3593,40 @@ elf32_arm_allocate_local_sym_info (bfd *abfd)
num_syms = elf_tdata (abfd)->symtab_hdr.sh_info;
size = num_syms * (sizeof (bfd_signed_vma)
- + sizeof (struct arm_local_iplt_info *)
+ sizeof (bfd_vma)
- + sizeof (char)
- + sizeof (struct fdpic_local));
+ + sizeof (struct arm_local_iplt_info *)
+ + sizeof (struct fdpic_local)
+ + sizeof (char));
data = bfd_zalloc (abfd, size);
if (data == NULL)
return FALSE;
- elf32_arm_local_fdpic_cnts (abfd) = (struct fdpic_local *) data;
- data += num_syms * sizeof (struct fdpic_local);
-
+ /* It is important that these all be allocated in descending
+ order of required alignment, so that arrays allocated later
+ will be sufficiently aligned. */
elf_local_got_refcounts (abfd) = (bfd_signed_vma *) data;
data += num_syms * sizeof (bfd_signed_vma);
+ elf32_arm_local_tlsdesc_gotent (abfd) = (bfd_vma *) data;
+ data += num_syms * sizeof (bfd_vma);
+
elf32_arm_local_iplt (abfd) = (struct arm_local_iplt_info **) data;
data += num_syms * sizeof (struct arm_local_iplt_info *);
- elf32_arm_local_tlsdesc_gotent (abfd) = (bfd_vma *) data;
- data += num_syms * sizeof (bfd_vma);
+ elf32_arm_local_fdpic_cnts (abfd) = (struct fdpic_local *) data;
+ data += num_syms * sizeof (struct fdpic_local);
elf32_arm_local_got_tls_type (abfd) = data;
+#if GCC_VERSION >= 3000
+ BFD_ASSERT (__alignof__ (*elf32_arm_local_tlsdesc_gotent (abfd))
+ <= __alignof__ (*elf_local_got_refcounts (abfd)));
+ BFD_ASSERT (__alignof__ (*elf32_arm_local_iplt (abfd))
+ <= __alignof__ (*elf32_arm_local_tlsdesc_gotent (abfd)));
+ BFD_ASSERT (__alignof__ (*elf32_arm_local_fdpic_cnts (abfd))
+ <= __alignof__ (*elf32_arm_local_iplt (abfd)));
+ BFD_ASSERT (__alignof__ (*elf32_arm_local_got_tls_type (abfd))
+ <= __alignof__ (*elf32_arm_local_fdpic_cnts (abfd)));
+#endif
}
return TRUE;
}