File libdwfl-sanity-check-partial-core-file-dyn-data-read.patch of Package elfutils.13244

[PATCH] libdwfl: Sanity check partial core file data reads.
From: Mark Wielaard <mark at klomp dot org>
To: elfutils-devel at sourceware dot org
Cc: Mark Wielaard <mark at klomp dot org>
Date: Sun, 14 Oct 2018 16:48:30 +0200
Subject: [PATCH] libdwfl: Sanity check partial core file data reads.
Reference: bnc#1123685

There were two issues when reading note data from a core file.
We didn't check if the data we already had in a buffer was big
enough. And if we did get the data, we should check if we got
everything, or just a part of the data.

https://sourceware.org/bugzilla/show_bug.cgi?id=23752

elfutils packaging edits:
 - changelog hunk removed from original patch to avoid conflict
 - backported from upstream patch to 0.158

Signed-off-by: Mark Wielaard <mark@klomp.org>
Sgined-off-by: Joao Moreira <jmoreira@suse.de>

--- a/libdwfl/dwfl_segment_report_module.c
+++ b/libdwfl/dwfl_segment_report_module.c
@@ -576,6 +576,9 @@
   if (dyn_filesz != 0 && dyn_filesz % dyn_entsize == 0
       && ! read_portion (&dyn_data, &dyn_data_size, dyn_vaddr, dyn_filesz))
     {
+      if (dyn_data_size != 0)
+        dyn_filesz = dyn_data_size;
+
       union
       {
 	Elf32_Dyn d32[dyn_filesz / sizeof (Elf32_Dyn)];