linux-kernel - [PATCH 4.4 45/56] selftests: firmware: add empty string and async tests

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Message-Id: <20171113125603.496800201@linuxfoundation.org>
Date:   Mon, 13 Nov 2017 13:56:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Brian Norris <computersforpeace@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Shuah Khan <shuahkh@....samsung.com>,
        Amit Pundir <amit.pundir@...aro.org>
Subject: [PATCH 4.4 45/56] selftests: firmware: add empty string and async tests

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Brian Norris <computersforpeace@...il.com>

commit 1b1fe542b6f010cf6bc7e1c92805e1c0e133e007 upstream.

Now that we've added a 'trigger_async_request' knob to test the
request_firmware_nowait() API, let's use it. Also add tests for the
empty ("") string, since there have been a couple errors in that
handling already.

Since we now have real ways that the sysfs write might fail, let's add
the appropriate check on the 'echo' lines too.

Signed-off-by: Brian Norris <computersforpeace@...il.com>
Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
[AmitP: Dropped the async trigger testing parts from original commit]
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/testing/selftests/firmware/fw_filesystem.sh |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/firmware/fw_filesystem.sh
+++ b/tools/testing/selftests/firmware/fw_filesystem.sh
@@ -48,8 +48,16 @@ echo "ABCD0123" >"$FW"
 
 NAME=$(basename "$FW")
 
+if printf '\000' >"$DIR"/trigger_request; then
+	echo "$0: empty filename should not succeed" >&2
+	exit 1
+fi
+
 # Request a firmware that doesn't exist, it should fail.
-echo -n "nope-$NAME" >"$DIR"/trigger_request
+if echo -n "nope-$NAME" >"$DIR"/trigger_request; then
+	echo "$0: firmware shouldn't have loaded" >&2
+	exit 1
+fi
 if diff -q "$FW" /dev/test_firmware >/dev/null ; then
 	echo "$0: firmware was not expected to match" >&2
 	exit 1