binutils: fix CVE-2019-17451

Backport upstream fix. No upstream release version of
binutils it yet, so backport the fix independently.

(From OE-Core rev: 3693a0a8b9461521b95613a76b7fd79c86a3bf8f)

Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 52 insertions, 0 deletions

diff --git a/meta/recipes-devtools/binutils/binutils-2.32.inc b/meta/recipes-devtools/binutils/binutils-2.32.inc
index 1e96cf494d..349c3e1154 100644
--- a/meta/recipes-devtools/binutils/binutils-2.32.inc
+++ b/meta/recipes-devtools/binutils/binutils-2.32.inc
@@ -50,6 +50,7 @@ SRC_URI = "\
      file://CVE-2019-14250.patch \
      file://CVE-2019-14444.patch \
      file://CVE-2019-17450.patch \
+     file://CVE-2019-17451.patch \
 "
 S  = "${WORKDIR}/git"
 
diff --git a/meta/recipes-devtools/binutils/binutils/CVE-2019-17451.patch b/meta/recipes-devtools/binutils/binutils/CVE-2019-17451.patch
new file mode 100644
index 0000000000..b36a532668
--- /dev/null
+++ b/meta/recipes-devtools/binutils/binutils/CVE-2019-17451.patch
@@ -0,0 +1,51 @@
+From 0192438051a7e781585647d5581a2a6f62fda362 Mon Sep 17 00:00:00 2001
+From: Alan Modra <amodra@gmail.com>
+Date: Wed, 9 Oct 2019 10:47:13 +1030
+Subject: [PATCH] PR25070, SEGV in function _bfd_dwarf2_find_nearest_line
+
+Selectively backporting fix for bfd/dwarf2.c, but not the ChangeLog
+file. There are newer versions of binutils, but none of them contain the
+commit fixing CVE-2019-17451, so backport it to master and zeus.
+
+Upstream-Status: Backport
+[https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=336bfbeb1848]
+CVE: CVE-2019-17451
+Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
+
+
+Evil testcase with two debug info sections, with sizes of 2aaaabac4ec1
+and ffffd5555453b140 result in a total size of 1.  Reading the first
+section of course overflows the buffer and tramples on other memory.
+
+        PR 25070
+        * dwarf2.c (_bfd_dwarf2_slurp_debug_info): Catch overflow of
+        total_size calculation.
+---
+ bfd/dwarf2.c | 11 ++++++++++-
+ 1 file changed, 10 insertions(+), 1 deletion(-)
+
+diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
+index 0b4e485582..a91597b1d0 100644
+--- a/bfd/dwarf2.c
++++ b/bfd/dwarf2.c
+@@ -4426,7 +4426,16 @@ _bfd_dwarf2_slurp_debug_info (bfd *abfd, bfd *debug_bfd,
+       for (total_size = 0;
+           msec;
+           msec = find_debug_info (debug_bfd, debug_sections, msec))
+-       total_size += msec->size;
++       {
++         /* Catch PR25070 testcase overflowing size calculation here.  */
++         if (total_size + msec->size < total_size
++             || total_size + msec->size < msec->size)
++           {
++             bfd_set_error (bfd_error_no_memory);
++             return FALSE;
++           }
++         total_size += msec->size;
++       }
+ 
+       stash->info_ptr_memory = (bfd_byte *) bfd_malloc (total_size);
+       if (stash->info_ptr_memory == NULL)
+-- 
+2.23.0
+