glibc: Security fix CVE-2017-15670

The GNU C Library (aka glibc or libc6) before 2.27 contains an off-by-one error leading to a heap-based buffer overflow in the glob function in glob.c, related to the processing of home directories using the ~ operator followed by a long string.

Affects: glibc < 2.27

v2]
capitlize "signed-off-by" in patch

(From OE-Core rev: a29cb640e3c0ca77ea232b89b89900cb55fa727c)

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-core/glibc/glibc/CVE-2017-15670.patch

@@ -0,0 +1,61 @@
+From a76376df7c07e577a9515c3faa5dbd50bda5da07 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Fri, 20 Oct 2017 18:41:14 +0200
+Subject: [PATCH] CVE-2017-15670: glob: Fix one-byte overflow [BZ #22320]
+
+(cherry picked from commit c369d66e5426a30e4725b100d5cd28e372754f90)
+
+Upstream-Status: Backport
+CVE: CVE-2017-15670
+Affects: glibc < 2.27
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ ChangeLog    | 6 ++++++
+ NEWS         | 5 +++++
+ posix/glob.c | 2 +-
+ 3 files changed, 12 insertions(+), 1 deletion(-)
+
+Index: git/NEWS
+===================================================================
+--- git.orig/NEWS
++++ git/NEWS
+@@ -206,6 +206,11 @@ Security related changes:
+ * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
+   fixed (CVE-2017-12133).
+ 
++  CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
++  suffered from a one-byte overflow during ~ operator processing (either
++  on the stack or the heap, depending on the length of the user name).
++  Reported by Tim Rühsen.
++
+ The following bugs are resolved with this release:
+ 
+   [984] network: Respond to changed resolv.conf in gethostbyname
+Index: git/posix/glob.c
+===================================================================
+--- git.orig/posix/glob.c
++++ git/posix/glob.c
+@@ -843,7 +843,7 @@ glob (const char *pattern, int flags, in
+ 		  *p = '\0';
+ 		}
+ 	      else
+-		*((char *) mempcpy (newp, dirname + 1, end_name - dirname))
++		*((char *) mempcpy (newp, dirname + 1, end_name - dirname - 1))
+ 		  = '\0';
+ 	      user_name = newp;
+ 	    }
+Index: git/ChangeLog
+===================================================================
+--- git.orig/ChangeLog
++++ git/ChangeLog
+@@ -1,3 +1,9 @@
++2017-10-20  Paul Eggert <eggert@cs.ucla.edu>
++
++       [BZ #22320]
++       CVE-2017-15670
++       * posix/glob.c (__glob): Fix one-byte overflow.
++
+ 2017-08-02  Siddhesh Poyarekar  <siddhesh@sourceware.org>
+ 
+ 	* version.h (RELEASE): Set to "stable"

meta/recipes-core/glibc/glibc_2.26.bb

@@ -43,6 +43,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \
            file://0026-assert-Suppress-pedantic-warning-caused-by-statement.patch \
            file://0027-glibc-reset-dl-load-write-lock-after-forking.patch \
            file://0028-Bug-4578-add-ld.so-lock-while-fork.patch \
+           file://CVE-2017-15670.patch \
 "
 
 NATIVESDKFIXES ?= ""