ltp: Add patch for string formatting security warning

A revamp of the syscalls/setregid tests made to use a new
library [LTP:7a1b4427] required a conversion to test messages.
This test in particular did not include a formatted string,
but a just a string element:
  testcases/kernel/syscalls/setregid/setregid01.c

This patch allows LTP to be built with -Wformat,
-Wformat-security, and -Werror=format-security.

(From OE-Core rev: ecee899dec53d324053112ed8764268fef930408)

Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ltp/ltp/setregid01-security-string-formatting.patch

@@ -0,0 +1,46 @@
+From 430e05c2169ed15aaa6d7f9459edd607603cee02 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Daniel=20D=C3=ADaz?= <daniel.diaz@linaro.org>
+Date: Mon, 25 Feb 2019 10:44:33 -0600
+Subject: [PATCH] setregid01: Fix security warning for string formatting
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+GCC 8.2.0 complains with the following:
+  setregid01.c: In function 'run':
+  setregid01.c:47:3: error: format not a string literal and no format arguments [-Werror=format-security]
+     tst_res(TFAIL | TTERRNO, tc->msg);
+     ^~~~~~~
+because there is no string formatting in the message. This can
+be seen with CFLAGS set to:
+  -Wformat -Wformat-security -Werror=format-security
+as Yocto Project's Poky does, e.g.:
+  http://errors.yoctoproject.org/Errors/Details/230043/
+
+Upstream-Status: Backport [46e1eda55f188810e6bf3a939b92d604321807ae]
+
+Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
+Reviewed-by: Enji Cooper <yaneurabeya@gmail.com>
+---
+ testcases/kernel/syscalls/setregid/setregid01.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/testcases/kernel/syscalls/setregid/setregid01.c b/testcases/kernel/syscalls/setregid/setregid01.c
+index f2e41e134..8c9e11918 100644
+--- a/testcases/kernel/syscalls/setregid/setregid01.c
++++ b/testcases/kernel/syscalls/setregid/setregid01.c
+@@ -44,9 +44,9 @@ static void run(unsigned int n)
+ 	TEST(SETREGID(*tc->arg1, *tc->arg2));
+ 
+ 	if (TST_RET == -1)
+-		tst_res(TFAIL | TTERRNO, tc->msg);
++		tst_res(TFAIL | TTERRNO, "%s", tc->msg);
+ 	else
+-		tst_res(TPASS, tc->msg);
++		tst_res(TPASS, "%s", tc->msg);
+ }
+ 
+ static void setup(void)
+-- 
+2.17.1
+

meta/recipes-extended/ltp/ltp_20190115.bb

@@ -29,11 +29,6 @@ CFLAGS_append_powerpc64 = " -D__SANE_USERSPACE_TYPES__"
 CFLAGS_append_mipsarchn64 = " -D__SANE_USERSPACE_TYPES__"
 SRCREV = "a6a5caef13632e669dda27b0461726eba546a2f3"
 
-# ltp doesn't currently build cleanly with
-# "-Wformat -Wformat-security -Werror=format-security" in CFLAGS
-# remove this when it does
-SECURITY_STRINGFORMAT = ""
-
 SRC_URI = "git://github.com/linux-test-project/ltp.git \
            file://0004-build-Add-option-to-select-libc-implementation.patch \
            file://0005-kernel-controllers-Link-with-libfts-explicitly-on-mu.patch \
@@ -53,6 +48,7 @@ SRC_URI = "git://github.com/linux-test-project/ltp.git \
            file://0039-commands-ar01-Fix-for-test-in-deterministic-mode.patch \
            file://0001-open_posix_testsuite-mmap24-2-Relax-condition-a-bit.patch \
            file://define-sigrtmin-and-sigrtmax-for-musl.patch \
+           file://setregid01-security-string-formatting.patch \
            "
 
 S = "${WORKDIR}/git"