binutils: CVE-2017-7303

Source: git://sourceware.org/git/binutils-gdb.git
MR: 74205
Type: Security Fix
Disposition: Backport from binutils-2_28-branch
ChangeID: db5bfb63661d39846c3b03353e1383c621759d48
Description:

    Fix seg-fault attempting to strip a corrupt binary.

        PR binutils/20922
        * elf.c (find_link): Check for null headers before attempting to
        match them.

Affects: <= 2.28
Author: Nick Clifton <nickc@redhat.com>
(From OE-Core rev: ef1a98976886560396a514458edb80a21f09b808)

Signed-off-by: Thiruvadi Rajaraman <trajaraman@mvista.com>
Reviewed-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/binutils/binutils-2.27.inc

@@ -65,6 +65,7 @@ SRC_URI = "\
      file://CVE-2017-7227.patch \
      file://CVE-2017-7301.patch \
      file://CVE-2017-7302.patch \
+     file://CVE-2017-7303.patch \
 "
 S  = "${WORKDIR}/git"
 

meta/recipes-devtools/binutils/binutils/CVE-2017-7303.patch

@@ -0,0 +1,55 @@
+commit a55c9876bb111fd301b4762cf501de0040b8f9db
+Author: Nick Clifton <nickc@redhat.com>
+Date:   Mon Dec 5 13:35:50 2016 +0000
+
+    Fix seg-fault attempting to strip a corrupt binary.
+    
+        PR binutils/20922
+        * elf.c (find_link): Check for null headers before attempting to
+        match them.
+
+Upstream-Status: Backport
+
+CVE: CVE-2017-7303
+Signed-off-by: Thiruvadi Rajaraman <tarjaraman@mvista.com>
+
+Index: git/bfd/ChangeLog
+===================================================================
+--- git.orig/bfd/ChangeLog	2017-09-04 16:06:08.996688391 +0530
++++ git/bfd/ChangeLog	2017-09-04 16:09:26.810320541 +0530
+@@ -124,6 +124,10 @@
+        (aout_link_add_symbols): Fix off by one error checking for
+        overflow of string offset.
+ 
++       PR binutils/20922
++       * elf.c (find_link): Check for null headers before attempting to
++       match them.
++
+        PR binutils/20921
+        * aoutx.h (squirt_out_relocs): Check for and report any relocs
+        that could not be recognised.
+Index: git/bfd/elf.c
+===================================================================
+--- git.orig/bfd/elf.c	2017-09-04 16:05:55.612577527 +0530
++++ git/bfd/elf.c	2017-09-04 16:08:35.709900050 +0530
+@@ -1249,13 +1249,19 @@
+   Elf_Internal_Shdr ** oheaders = elf_elfsections (obfd);
+   unsigned int i;
+ 
+-  if (section_match (oheaders[hint], iheader))
++  BFD_ASSERT (iheader != NULL);
++
++  /* See PR 20922 for a reproducer of the NULL test.  */
++  if (oheaders[hint] != NULL
++      && section_match (oheaders[hint], iheader))
+     return hint;
+ 
+   for (i = 1; i < elf_numsections (obfd); i++)
+     {
+       Elf_Internal_Shdr * oheader = oheaders[i];
+ 
++      if (oheader == NULL)
++	continue;
+       if (section_match (oheader, iheader))
+ 	/* FIXME: Do we care if there is a potential for
+ 	   multiple matches ?  */