linux-kernel - [PATCH v2 7/9] test_sysctl: add simple proc

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Date:   Fri, 10 Feb 2017 16:36:12 -0800
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        ebiederm@...ssion.com, keescook@...omium.org, acme@...hat.com,
        mingo@...nel.org, mgorman@...e.de, subashab@...eaurora.org
Cc:     jeyu@...hat.com, rusty@...tcorp.com.au, swhiteho@...hat.com,
        deepa.kernel@...il.com, matt@...eblueprint.co.uk,
        adobriyan@...il.com, bp@...e.de, dmitry.torokhov@...il.com,
        shuah@...nel.org, torvalds@...ux-foundation.org,
        linux@...ck-us.net, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>
Subject: [PATCH v2 7/9] test_sysctl: add simple proc_dointvec() case

Test against a simple proc_dointvec() case. While at it, add
a test against INT_MAX. Make sure INT_MAX works, and INT_MAX+1
will fail. Also test negative values work.

Signed-off-by: Luis R. Rodriguez <mcgrof@...nel.org>
---
 lib/test_sysctl.c                        | 11 ++++++
 tools/testing/selftests/sysctl/sysctl.sh | 62 ++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)

diff --git a/lib/test_sysctl.c b/lib/test_sysctl.c
index 9b9ae1a95ab3..c36a024d7351 100644
--- a/lib/test_sysctl.c
+++ b/lib/test_sysctl.c
@@ -34,11 +34,15 @@ static int i_one_hundred = 100;
 
 struct test_sysctl_data {
 	int int_0001;
+	int int_0002;
+
 	char string_0001[65];
 };
 
 static struct test_sysctl_data test_data = {
 	.int_0001 = 60,
+	.int_0002 = 1,
+
 	.string_0001 = "(none)",
 };
 
@@ -54,6 +58,13 @@ static struct ctl_table test_table[] = {
 		.extra2         = &i_one_hundred,
 	},
 	{
+		.procname	= "int_0002",
+		.data		= &test_data.int_0002,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{
 		.procname	= "string_0001",
 		.data		= &test_data.string_0001,
 		.maxlen		= sizeof(test_data.string_0001),
diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
index 14b9d875db42..45fd2ee5739c 100755
--- a/tools/testing/selftests/sysctl/sysctl.sh
+++ b/tools/testing/selftests/sysctl/sysctl.sh
@@ -24,6 +24,7 @@ TEST_FILE=$(mktemp)
 # we have tons of space.
 ALL_TESTS="0001:1:1"
 ALL_TESTS="$ALL_TESTS 0002:1:1"
+ALL_TESTS="$ALL_TESTS 0003:1:1"
 
 test_modprobe()
 {
@@ -52,6 +53,9 @@ function allow_user_defaults()
 	if [ -z $MAX_DIGITS ]; then
 		MAX_DIGITS=$(($PAGE_SIZE/8))
 	fi
+	if [ -z $INT_MAX ]; then
+		INT_MAX=$(getconf INT_MAX)
+	fi
 }
 
 test_reqs()
@@ -92,6 +96,9 @@ reset_vals()
 		int_0001)
 			VAL="60"
 			;;
+		int_0002)
+			VAL="1"
+			;;
 		string_0001)
 			VAL="(none)"
 			;;
@@ -261,6 +268,48 @@ run_limit_digit()
 	test_rc
 }
 
+# You are using an int
+run_limit_digit_int()
+{
+	echo -n "Testing INT_MAX works ..."
+	reset_vals
+	TEST_STR="$INT_MAX"
+	echo -n $TEST_STR > $TARGET
+
+	if ! verify "${TARGET}"; then
+		echo "FAIL" >&2
+		rc=1
+	else
+		echo "ok"
+	fi
+	test_rc
+
+	echo -n "Testing INT_MAX + 1 will fail as expected..."
+	reset_vals
+	TEST_STR=$(($INT_MAX+1))
+	echo -n $TEST_STR > $TARGET 2> /dev/null
+
+	if verify "${TARGET}"; then
+		echo "FAIL" >&2
+		rc=1
+	else
+		echo "ok"
+	fi
+	test_rc
+
+	echo -n "Testing negative values will work as expected..."
+	reset_vals
+	TEST_STR="-3"
+	echo -n $TEST_STR > $TARGET 2> /dev/null
+	if ! verify "${TARGET}"; then
+		echo "FAIL" >&2
+		rc=1
+	else
+		echo "ok"
+	fi
+	test_rc
+}
+
 run_stringtests()
 {
 	echo -n "Writing entire sysctl in short writes ... "
@@ -354,6 +403,18 @@ sysctl_test_0002()
 	run_stringtests
 }
 
+sysctl_test_0003()
+{
+	TARGET="${SYSCTL}/int_0002"
+	reset_vals
+	ORIG=$(cat "${TARGET}")
+	TEST_STR=$(( $ORIG + 1 ))
+
+	run_numerictests
+	run_limit_digit
+	run_limit_digit_int
+}
+
 list_tests()
 {
 	echo "Test ID list:"
@@ -364,6 +425,7 @@ list_tests()
 	echo
 	echo "0001 x $(get_test_count 0001) - tests proc_dointvec_minmax()"
 	echo "0002 x $(get_test_count 0002) - tests proc_dostring()"
+	echo "0003 x $(get_test_count 0003) - tests proc_dointvec()"
 }
 
 test_reqs
-- 
2.11.0