Fix excessive memory allocation attempts and possible integer overfloaws when attempt...

[deliverable/binutils-gdb.git] / bfd / elf32-wasm32.c

diff --git a/bfd/elf32-wasm32.c b/bfd/elf32-wasm32.c
index 9b3827248fb464be331842843eac97fb9bb6ffba..6d2e04ece255a3ed62d6f63f042a63ecf3a7e984 100644 (file)
--- a/bfd/elf32-wasm32.c
+++ b/bfd/elf32-wasm32.c
@@ -23,8 +23,108 @@
 #include "libbfd.h"
 #include "elf-bfd.h"
 #include "bfd_stdint.h"
+#include "libiberty.h"
 #include "elf/wasm32.h"
 
+static reloc_howto_type elf32_wasm32_howto_table[] =
+{
+  HOWTO (R_WASM32_NONE,                /* type */
+         0,                    /* rightshift */
+         3,                    /* size (0 = byte, 1 = short, 2 = long) */
+         0,                    /* bitsize */
+         FALSE,                        /* pc_relative */
+         0,                    /* bitpos */
+         complain_overflow_dont,/* complain_on_overflow */
+         bfd_elf_generic_reloc,        /* special_function */
+         "R_WASM32_NONE",      /* name */
+         FALSE,                        /* partial_inplace */
+         0,                    /* src_mask */
+         0,                    /* dst_mask */
+         FALSE),               /* pcrel_offset */
+
+  /* 32 bit absolute */
+  HOWTO (R_WASM32_32,          /* type */
+         0,                    /* rightshift */
+         2,                    /* size (0 = byte, 1 = short, 2 = long) */
+         32,                   /* bitsize */
+         FALSE,                        /* pc_relative */
+         0,                    /* bitpos */
+         complain_overflow_bitfield,/* complain_on_overflow */
+         bfd_elf_generic_reloc,        /* special_function */
+         "R_WASM32_32",        /* name */
+         FALSE,                        /* partial_inplace */
+         0xffffffff,           /* src_mask */
+         0xffffffff,           /* dst_mask */
+         FALSE),               /* pcrel_offset */
+};
+
+/* Look up the relocation CODE.  */
+
+static reloc_howto_type *
+elf32_wasm32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+                                bfd_reloc_code_real_type code)
+{
+  switch (code)
+    {
+    case BFD_RELOC_NONE:
+      return &elf32_wasm32_howto_table[R_WASM32_NONE];
+    case BFD_RELOC_32:
+      return &elf32_wasm32_howto_table[R_WASM32_32];
+    default:
+      break;
+    }
+
+  return NULL;
+}
+
+/* Look up the relocation R_NAME.  */
+
+static reloc_howto_type *
+elf32_wasm32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+                                const char *r_name)
+{
+  unsigned int i;
+
+  for (i = 0; i < ARRAY_SIZE (elf32_wasm32_howto_table); i++)
+    if (elf32_wasm32_howto_table[i].name != NULL
+        && strcasecmp (elf32_wasm32_howto_table[i].name, r_name) == 0)
+      return &elf32_wasm32_howto_table[i];
+
+  return NULL;
+}
+
+/* Look up the relocation R_TYPE.  */
+
+static reloc_howto_type *
+elf32_wasm32_rtype_to_howto (bfd *abfd, unsigned r_type)
+{
+  unsigned int i = r_type;
+
+  if (i >= ARRAY_SIZE (elf32_wasm32_howto_table))
+    {
+      /* xgettext:c-format */
+      _bfd_error_handler (_("%B: invalid relocation type %d"),
+                         abfd, (int) r_type);
+      i = R_WASM32_NONE;
+    }
+
+  if (elf32_wasm32_howto_table[i].type != r_type)
+    return NULL;
+
+  return &elf32_wasm32_howto_table[i];
+}
+
+/* Translate the ELF-internal relocation RELA into CACHE_PTR.  */
+
+static void
+elf32_wasm32_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
+                                arelent *cache_ptr,
+                                Elf_Internal_Rela *dst)
+{
+  unsigned int r_type = ELF32_R_TYPE (dst->r_info);
+  cache_ptr->howto = elf32_wasm32_rtype_to_howto (abfd, r_type);
+}
+
 #define ELF_ARCH               bfd_arch_wasm32
 #define ELF_TARGET_ID          EM_WEBASSEMBLY
 #define ELF_MACHINE_CODE       EM_WEBASSEMBLY
@@ -40,8 +140,11 @@
 /* For testing. */
 #define elf_backend_want_dynrelro       1
 
-#define bfd_elf32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
-#define bfd_elf32_bfd_reloc_name_lookup _bfd_norelocs_bfd_reloc_name_lookup
+#define elf_info_to_howto              elf32_wasm32_info_to_howto_rela
+#define elf_info_to_howto_rel          NULL
+
+#define bfd_elf32_bfd_reloc_type_lookup elf32_wasm32_reloc_type_lookup
+#define bfd_elf32_bfd_reloc_name_lookup elf32_wasm32_reloc_name_lookup
 
 #define ELF_DYNAMIC_INTERPRETER  "/sbin/elf-dynamic-interpreter.so"