[V3][PATCH] glibc: Security Fix CVE-2017-17426

[Armin Kuster <akuster808@gmail.com>]

From: Huang Qiyu <huangqy.fnst@cn.fujitsu.com>

Affects glibc < 2.27 including current master
hash 77f921dac17c5fa99bd9e926d926c327982895f7

Signed-off-by: Huang Qiyu <huangqy.fnst@cn.fujitsu.com>

[v2]
Rebased on new master

[v3]
Fix typo in patch status

Signed-off-by: Armin Kuster <akuster808@gmail.com>
---
 meta/recipes-core/glibc/glibc/CVE-2017-17426.patch | 53 ++++++++++++++++++++++
 meta/recipes-core/glibc/glibc_2.26.bb              |  1 +
 2 files changed, 54 insertions(+)
 create mode 100644 meta/recipes-core/glibc/glibc/CVE-2017-17426.patch

diff --git a/meta/recipes-core/glibc/glibc/CVE-2017-17426.patch b/meta/recipes-core/glibc/glibc/CVE-2017-17426.patch
new file mode 100644
index 0000000..bfa58bc
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/CVE-2017-17426.patch
@@ -0,0 +1,53 @@
+From 34697694e8a93b325b18f25f7dcded55d6baeaf6 Mon Sep 17 00:00:00 2001
+From: Arjun Shankar <arjun@redhat.com>
+Date: Thu, 30 Nov 2017 13:31:45 +0100
+Subject: [PATCH] Fix integer overflow in malloc when tcache is enabled [BZ
+ #22375]
+
+When the per-thread cache is enabled, __libc_malloc uses request2size (which
+does not perform an overflow check) to calculate the chunk size from the
+requested allocation size. This leads to an integer overflow causing malloc
+to incorrectly return the last successfully allocated block when called with
+a very large size argument (close to SIZE_MAX).
+
+This commit uses checked_request2size instead, removing the overflow.
+
+Upstream-Status: Backport
+CVE: CVE-2017-17426
+Signed-off-by: Huang Qiyu <huangqy.fnst@cn.fujitsu.com>
+Rebase on new master
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ ChangeLog       | 6 ++++++
+ malloc/malloc.c | 3 ++-
+ 2 files changed, 8 insertions(+), 1 deletion(-)
+
+Index: git/malloc/malloc.c
+===================================================================
+--- git.orig/malloc/malloc.c
++++ git/malloc/malloc.c
+@@ -3064,7 +3064,8 @@ __libc_malloc (size_t bytes)
+     return (*hook)(bytes, RETURN_ADDRESS (0));
+ #if USE_TCACHE
+   /* int_free also calls request2size, be careful to not pad twice.  */
+-  size_t tbytes = request2size (bytes);
++  size_t tbytes;
++  checked_request2size (bytes, tbytes);
+   size_t tc_idx = csize2tidx (tbytes);
+ 
+   MAYBE_INIT_TCACHE ();
+Index: git/ChangeLog
+===================================================================
+--- git.orig/ChangeLog
++++ git/ChangeLog
+@@ -1,3 +1,9 @@
++2017-11-30  Arjun Shankar  <arjun@redhat.com>
++
++       [BZ #22375]
++       * malloc/malloc.c (__libc_malloc): Use checked_request2size
++       instead of request2size.
++
+ 2017-12-30  Aurelien Jarno  <aurelien@aurel32.net>
+            Dmitry V. Levin  <ldv@altlinux.org>
+ 
diff --git a/meta/recipes-core/glibc/glibc_2.26.bb b/meta/recipes-core/glibc/glibc_2.26.bb
index 456ce12..ff3197b 100644
--- a/meta/recipes-core/glibc/glibc_2.26.bb
+++ b/meta/recipes-core/glibc/glibc_2.26.bb
@@ -45,6 +45,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \
            file://0029-malloc-add-missing-arena-lock-in-malloc-info.patch \
            file://CVE-2017-15671.patch \
            file://CVE-2017-16997.patch \
+           file://CVE-2017-17426.patch \
 "
 
 NATIVESDKFIXES ?= ""
-- 
2.7.4