Fix integer overflow problems when reading an ELF binary with corrupt augmentation...

	PR 22386
	* dwarf.c (read_cie): Use bfd_size_type for
	augmentation_data_len.
	(display_augmentation_data): New function.
	(display_debug_frames): Use it.
	Check for integer overflow when testing augmentation_data_len.

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 19f9261..aa76e27 100644 (file)
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,13 @@
+2017-11-03  Mingi Cho  <mgcho.minic@gmail.com>
+           Nick Clifton  <nickc@redhat.com>
+
+       PR 22386
+       * dwarf.c (read_cie): Use bfd_size_type for
+       augmentation_data_len.
+       (display_augmentation_data): New function.
+       (display_debug_frames): Use it.
+       Check for integer overflow when testing augmentation_data_len.
+
 2017-11-02  Mingi Cho  <mgcho.minic@gmail.com>
 
        PR 22384

diff --git a/binutils/dwarf.c b/binutils/dwarf.c
index 873f104..fd9341a 100644 (file)
--- a/binutils/dwarf.c
+++ b/binutils/dwarf.c
@@ -6989,13 +6989,13 @@ frame_display_row (Frame_Chunk *fc, int *need_col_headers, unsigned int *max_reg
 static unsigned char *
 read_cie (unsigned char *start, unsigned char *end,
          Frame_Chunk **p_cie, int *p_version,
-         unsigned long *p_aug_len, unsigned char **p_aug)
+         bfd_size_type *p_aug_len, unsigned char **p_aug)
 {
   int version;
   Frame_Chunk *fc;
   unsigned int length_return;
   unsigned char *augmentation_data = NULL;
-  unsigned long augmentation_data_len = 0;
+  bfd_size_type augmentation_data_len = 0;
 
   * p_cie = NULL;
   /* PR 17512: file: 001-228113-0.004.  */
@@ -7065,10 +7065,11 @@ read_cie (unsigned char *start, unsigned char *end,
       READ_ULEB (augmentation_data_len);
       augmentation_data = start;
       /* PR 17512: file: 11042-2589-0.004.  */
-      if (augmentation_data_len > (size_t) (end - start))
+      if (augmentation_data_len > (bfd_size_type) (end - start))
        {
-         warn (_("Augmentation data too long: %#lx, expected at most %#lx\n"),
-               augmentation_data_len, (unsigned long) (end - start));
+         warn (_("Augmentation data too long: 0x%s, expected at most %#lx\n"),
+               dwarf_vmatoa ("x", augmentation_data_len),
+               (unsigned long) (end - start));
          return end;
        }
       start += augmentation_data_len;
@@ -7113,6 +7114,31 @@ read_cie (unsigned char *start, unsigned char *end,
   return start;
 }
 
+/* Prints out the contents on the augmentation data array.
+   If do_wide is not enabled, then formats the output to fit into 80 columns.  */
+
+static void
+display_augmentation_data (const unsigned char * data, const bfd_size_type len)
+{
+  bfd_size_type i;
+
+  i = printf (_("  Augmentation data:    "));
+
+  if (do_wide || len < ((80 - i) / 3))
+    for (i = 0; i < len; ++i)
+      printf (" %02x", data[i]);
+  else
+    {
+      for (i = 0; i < len; ++i)
+       {
+         if (i % (80 / 3) == 0)
+           putchar ('\n');
+         printf (" %02x", data[i]);
+       }
+    }
+  putchar ('\n');
+}
+
 static int
 display_debug_frames (struct dwarf_section *section,
                      void *file ATTRIBUTE_UNUSED)
@@ -7141,7 +7167,7 @@ display_debug_frames (struct dwarf_section *section,
       Frame_Chunk *cie;
       int need_col_headers = 1;
       unsigned char *augmentation_data = NULL;
-      unsigned long augmentation_data_len = 0;
+      bfd_size_type augmentation_data_len = 0;
       unsigned int encoded_ptr_size = saved_eh_addr_size;
       unsigned int offset_size;
       unsigned int initial_length_size;
@@ -7235,16 +7261,8 @@ display_debug_frames (struct dwarf_section *section,
              printf ("  Return address column: %d\n", fc->ra);
 
              if (augmentation_data_len)
-               {
-                 unsigned long i;
+               display_augmentation_data (augmentation_data, augmentation_data_len);
 
-                 printf ("  Augmentation data:    ");
-                 for (i = 0; i < augmentation_data_len; ++i)
-                   /* FIXME: If do_wide is FALSE, then we should
-                      add carriage returns at 80 columns...  */
-                   printf (" %02x", augmentation_data[i]);
-                 putchar ('\n');
-               }
              putchar ('\n');
            }
        }
@@ -7400,11 +7418,13 @@ display_debug_frames (struct dwarf_section *section,
              READ_ULEB (augmentation_data_len);
              augmentation_data = start;
              start += augmentation_data_len;
-             /* PR 17512: file: 722-8446-0.004.  */
-             if (start >= end || ((signed long) augmentation_data_len) < 0)
+             /* PR 17512 file: 722-8446-0.004 and PR 22386.  */
+             if (start >= end
+                 || ((bfd_signed_vma) augmentation_data_len) < 0
+                 || augmentation_data > start)
                {
-                 warn (_("Corrupt augmentation data length: %lx\n"),
-                       augmentation_data_len);
+                 warn (_("Corrupt augmentation data length: 0x%s\n"),
+                       dwarf_vmatoa ("x", augmentation_data_len));
                  start = end;
                  augmentation_data = NULL;
                  augmentation_data_len = 0;
@@ -7426,12 +7446,7 @@ display_debug_frames (struct dwarf_section *section,
 
          if (! do_debug_frames_interp && augmentation_data_len)
            {
-             unsigned long i;
-
-             printf ("  Augmentation data:    ");
-             for (i = 0; i < augmentation_data_len; ++i)
-               printf (" %02x", augmentation_data[i]);
-             putchar ('\n');
+             display_augmentation_data (augmentation_data, augmentation_data_len);
              putchar ('\n');
            }
        }