grep: fix for CVE-2012-5667

Multiple integer overflows in GNU Grep before 2.11 might allow
context-dependent attackers to execute arbitrary code via vectors
involving a long input line that triggers a heap-based buffer overflow.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-5667

(From OE-Core rev: 7dd4d0178e2b057f76cd2b0b6fe8402f8c1ab23d)

Signed-off-by: Ming Liu <ming.liu@windriver.com>
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/grep/grep-2.5.1a/grep-CVE-2012-5667.patch

@@ -0,0 +1,32 @@
+The patch to fix CVE-2012-5667
+Reference: https://bugzilla.redhat.com/attachment.cgi?id=686605&action=diff
+
+Multiple integer overflows in GNU Grep before 2.11 might allow
+context-dependent attackers to execute arbitrary code via vectors
+involving a long input line that triggers a heap-based buffer overflow.
+
+http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-5667
+
+Upstream-status: Inappropriate [other]
+This version of GNU Grep has been abandoned upstream and they are no longer
+accepting patches.  This is not a backport.
+
+Signed-off-by Ming Liu <ming.liu@windriver.com>
+---
+ grep.c |    7 +++----
+ 1 file changed, 3 insertions(+), 4 deletions(-)
+
+--- a/src/grep.c	2013-05-15 13:39:33.359191769 +0800
++++ a/src/grep.c	2013-05-15 13:50:22.609191882 +0800
+@@ -306,6 +306,11 @@ fillbuf (size_t save, struct stats const
+   int cc = 1;
+   char *readbuf;
+   size_t readsize;
++  const size_t max_save = INT_MAX / 2;
++
++  /* Limit the amount of saved data to INT_MAX to fix CVE-2012-5667 */
++  if (save > max_save)
++     error (2, 0, _("line too long"));
+ 
+   /* Offset from start of buffer to start of old stuff
+      that we want to save.  */

meta/recipes-extended/grep/grep_2.5.1a.bb

@@ -13,7 +13,8 @@ SRC_URI = "${GNU_MIRROR}/grep/grep-${PV}.tar.bz2 \
            file://gettext.patch \
            file://fix64-int-to-pointer.patch \
            file://Makevars \
-           "
+           file://grep-CVE-2012-5667.patch \
+          "
 
 SRC_URI[md5sum] = "52202fe462770fa6be1bb667bd6cf30c"
 SRC_URI[sha256sum] = "38c8a2bb9223d1fb1b10bdd607cf44830afc92fd451ac4cd07619bf92bdd3132"