ltp: fix CVE-2017-5669 test case

Adding CVE-2017-5669 test fix patch which is accepted upstream in LTP repo.

Ref:
cve-2017-5669: shmat() for 0 (or <PAGESIZE with RND flag) has to fail with REMAPs
https://github.com/linux-test-project/ltp/pull/324

Upstream-Status: Accepted [https://github.com/linux-test-project/ltp/pull/324]
Signed-off-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Ross Burton <ross.burton@intel.com>

2 files changed, 98 insertions, 0 deletions

diff --git a/meta/recipes-extended/ltp/ltp/0041-cve-2017-5669-shmat-for-0-or-PAGESIZE-with-RND-flag-.patch b/meta/recipes-extended/ltp/ltp/0041-cve-2017-5669-shmat-for-0-or-PAGESIZE-with-RND-flag-.patch
new file mode 100644
index 0000000000..0d2d2cbce4
--- /dev/null
+++ b/meta/recipes-extended/ltp/ltp/0041-cve-2017-5669-shmat-for-0-or-PAGESIZE-with-RND-flag-.patch
@@ -0,0 +1,97 @@
+From b767b73ef027ba8d35f297c7d3659265ac80425b Mon Sep 17 00:00:00 2001
+From: Rafael David Tinoco <rafael.tinoco@canonical.com>
+Date: Wed, 30 May 2018 09:14:34 -0300
+Subject: [PATCH] cve-2017-5669: shmat() for 0 (or <PAGESIZE with RND flag) has
+ to fail with REMAPs
+
+Fixes: https://github.com/linux-test-project/ltp/issues/319
+
+According to upstream thread (https://lkml.org/lkml/2018/5/28/2056),
+cve-2017-5669 needs to address the "new" way of handling nil addresses
+for shmat() when used with MAP_FIXED or SHM_REMAP flags.
+
+- mapping nil-page is OK on lower addresses with MAP_FIXED (or else X11 is broken)
+- mapping nil-page is NOT OK with SHM_REMAP on lower addresses
+
+Addresses Davidlohr Bueso's comments/changes:
+
+commit 8f89c007b6de
+Author: Davidlohr Bueso <dave@stgolabs.net>
+Date:   Fri May 25 14:47:30 2018 -0700
+
+    ipc/shm: fix shmat() nil address after round-down when remapping
+
+commit a73ab244f0da
+Author: Davidlohr Bueso <dave@stgolabs.net>
+Date:   Fri May 25 14:47:27 2018 -0700
+
+    Revert "ipc/shm: Fix shmat mmap nil-page protection"
+
+For previously test, and now broken, made based on:
+
+commit 95e91b831f87
+Author: Davidlohr Bueso <dave@stgolabs.net>
+Date:   Mon Feb 27 14:28:24 2017 -0800
+
+    ipc/shm: Fix shmat mmap nil-page protection
+
+Signed-off-by: Rafael David Tinoco <rafael.tinoco@linaro.org>
+Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
+Reviewed-by: Jan Stancek <jstancek@redhat.com>
+
+Upstream-Status: Accepted [https://github.com/linux-test-project/ltp/pull/324]
+CVE: CVE-2017-5669
+Signed-off-by: Rafael David Tinoco <rafael.tinoco@linaro.org>
+---
+ testcases/cve/cve-2017-5669.c | 20 +++++++++++++++++++-
+ 1 file changed, 19 insertions(+), 1 deletion(-)
+
+diff --git a/testcases/cve/cve-2017-5669.c b/testcases/cve/cve-2017-5669.c
+index 1ca5983..0834626 100644
+--- a/testcases/cve/cve-2017-5669.c
++++ b/testcases/cve/cve-2017-5669.c
+@@ -28,7 +28,20 @@
+  * is just to see if we get an access error or some other unexpected behaviour.
+  *
+  * See commit 95e91b831f (ipc/shm: Fix shmat mmap nil-page protection)
++ *
++ * The commit above disallowed SHM_RND maps to zero (and rounded) entirely and
++ * that broke userland for cases like Xorg. New behavior disallows REMAPs to
++ * lower addresses (0<=PAGESIZE).
++ *
++ * See commit a73ab244f0da (Revert "ipc/shm: Fix shmat mmap nil-page protect...)
++ * See commit 8f89c007b6de (ipc/shm: fix shmat() nil address after round-dow...)
++ * See https://github.com/linux-test-project/ltp/issues/319
++ *
++ * This test needs root permissions or else security_mmap_addr(), from
++ * get_unmapped_area(), will cause permission errors when trying to mmap lower
++ * addresses.
+  */
++
+ #include <sys/types.h>
+ #include <sys/ipc.h>
+ #include <sys/shm.h>
+@@ -60,7 +73,11 @@ static void cleanup(void)
+ static void run(void)
+ {
+ 	tst_res(TINFO, "Attempting to attach shared memory to null page");
+-	shm_addr = shmat(shm_id, ((void *)1), SHM_RND);
++	/*
++	 * shmat() for 0 (or < PAGESIZE with RND flag) has to fail with REMAPs
++	 * https://github.com/linux-test-project/ltp/issues/319
++	 */
++	shm_addr = shmat(shm_id, ((void *)1), SHM_RND | SHM_REMAP);
+ 	if (shm_addr == (void *)-1) {
+ 		shm_addr = NULL;
+ 		if (errno == EINVAL) {
+@@ -89,6 +106,7 @@ static void run(void)
+ }
+ 
+ static struct tst_test test = {
++	.needs_root = 1,
+ 	.setup = setup,
+ 	.cleanup = cleanup,
+ 	.test_all = run,
+-- 
+2.7.4
+
diff --git a/meta/recipes-extended/ltp/ltp_20180515.bb b/meta/recipes-extended/ltp/ltp_20180515.bb
index 21ff49830a..8f64d7b64a 100644
--- a/meta/recipes-extended/ltp/ltp_20180515.bb
+++ b/meta/recipes-extended/ltp/ltp_20180515.bb
@@ -48,6 +48,7 @@ SRC_URI = "git://github.com/linux-test-project/ltp.git \
            file://0036-testcases-network-nfsv4-acl-acl1.c-Security-fix-on-s.patch \
            file://0039-commands-ar01-Fix-for-test-in-deterministic-mode.patch \
            file://0040-read_all-Define-FNM_EXTMATCH-if-not-already-like-und.patch \
+           file://0041-cve-2017-5669-shmat-for-0-or-PAGESIZE-with-RND-flag-.patch \
            "
 
 S = "${WORKDIR}/git"