linux-kernel - [PATCH] selftests: firmware: Fix it to do root uid check and skip

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Message-Id: <20191213015606.23058-1-skhan@linuxfoundation.org>
Date:   Thu, 12 Dec 2019 18:56:06 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     shuah@...nel.org, gregkh@...uxfoundation.org, mcgrof@...nel.org,
        scott.branden@...adcom.com, tiwai@...e.de
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] selftests: firmware: Fix it to do root uid check and skip

firmware attempts to load test modules that require root access
and fail. Fix it to check for root uid and exit with skip code
instead.

Before this fix:

selftests: firmware: fw_run_tests.sh
modprobe: ERROR: could not insert 'test_firmware': Operation not permitted
You must have the following enabled in your kernel:
CONFIG_TEST_FIRMWARE=y
CONFIG_FW_LOADER=y
CONFIG_FW_LOADER_USER_HELPER=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y
not ok 1 selftests: firmware: fw_run_tests.sh # SKIP

With this fix:

selftests: firmware: fw_run_tests.sh
skip all tests: must be run as root
not ok 1 selftests: firmware: fw_run_tests.sh # SKIP

Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
---
 tools/testing/selftests/firmware/fw_lib.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/firmware/fw_lib.sh b/tools/testing/selftests/firmware/fw_lib.sh
index b879305a766d..5b8c0fedee76 100755
--- a/tools/testing/selftests/firmware/fw_lib.sh
+++ b/tools/testing/selftests/firmware/fw_lib.sh
@@ -34,6 +34,12 @@ test_modprobe()
 
 check_mods()
 {
+	local uid=$(id -u)
+	if [ $uid -ne 0 ]; then
+		echo "skip all tests: must be run as root" >&2
+		exit $ksft_skip
+	fi
+
 	trap "test_modprobe" EXIT
 	if [ ! -d $DIR ]; then
 		modprobe test_firmware
-- 
2.20.1