Refine size constraints applied to win32pstatus ELF notes

Don't reject any win32pstatus notes smaller than minimum size for a
NOTE_INFO_THREAD.

This only happens to work because the Cygwin dumper tool currently
writes all these notes as the largest size of the union, (which wastes
lots of space in the core dump).

Instead, apply the appropriate size constraint for each win32pstatus
note type.

bfd/ChangeLog:

2020-07-11  Jon Turney  <jon.turney@dronecode.org.uk>

	* elf.c (elfcore_grok_win32pstatus): Don't apply size constraint
	for NOTE_INFO_THREAD to all win32pstatus ELF notes, instead apply
	appropriate size constraint for each win32pstatus note type.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index c99e654cc20876af6bdb1354905fffc5b8cfff80..9b4e74d214e43713a5f2282f3c43f3319b4e1c2d 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2020-07-11  Jon Turney  <jon.turney@dronecode.org.uk>
+
+       * elf.c (elfcore_grok_win32pstatus): Don't apply size constraint
+       for NOTE_INFO_THREAD to all win32pstatus ELF notes, instead apply
+       appropriate size constraint for each win32pstatus note type.
+
 2020-07-01  Jon Turney  <jon.turney@dronecode.org.uk>
 
        * elf.c (elfcore_grok_win32pstatus): Don't hardcode the size of

diff --git a/bfd/elf.c b/bfd/elf.c
index 43a6cba89dacfa617950feb527a6819f80d4c0f0..171880d6c2a1f36b41bee0e53881b799733bace1 100644 (file)
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -10139,12 +10139,13 @@ elfcore_grok_win32pstatus (bfd *abfd, Elf_Internal_Note *note)
   char buf[30];
   char *name;
   size_t len;
+  size_t name_size;
   asection *sect;
   int type;
   int is_active_thread;
   bfd_vma base_addr;
 
-  if (note->descsz < 728)
+  if (note->descsz < 4)
     return TRUE;
 
   if (! CONST_STRNEQ (note->namedata, "win32"))
@@ -10155,12 +10156,18 @@ elfcore_grok_win32pstatus (bfd *abfd, Elf_Internal_Note *note)
   switch (type)
     {
     case NOTE_INFO_PROCESS:
+      if (note->descsz < 12)
+        return FALSE;
+
       /* FIXME: need to add ->core->command.  */
       elf_tdata (abfd)->core->pid = bfd_get_32 (abfd, note->descdata + 4);
       elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 8);
       break;
 
     case NOTE_INFO_THREAD:
+      if (note->descsz < 12)
+        return FALSE;
+
       /* Make a ".reg/<tid>" section containing the Win32 API thread CONTEXT
          structure. */
       /* thread_info.tid */
@@ -10192,6 +10199,9 @@ elfcore_grok_win32pstatus (bfd *abfd, Elf_Internal_Note *note)
       break;
 
     case NOTE_INFO_MODULE:
+      if (note->descsz < 12)
+        return FALSE;
+
       /* Make a ".module/xxxxxxxx" section.  */
       /* module_info.base_address */
       base_addr = bfd_get_32 (abfd, note->descdata + 4);
@@ -10209,6 +10219,11 @@ elfcore_grok_win32pstatus (bfd *abfd, Elf_Internal_Note *note)
       if (sect == NULL)
        return FALSE;
 
+      /* module_info.module_name_size */
+      name_size = bfd_get_32 (abfd, note->descdata + 8);
+      if (note->descsz < 12 + name_size)
+        return FALSE;
+
       sect->size = note->descsz;
       sect->filepos = note->descpos;
       sect->alignment_power = 2;