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Subject: [PATCH V2] test_sysctl: add proc_do_large_bitmap test function
To:     Eric Sandeen <sandeen@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        fsdevel <linux-fsdevel@vger.kernel.org>, netdev@vger.kernel.org
Cc:     Luis Chamberlain <mcgrof@kernel.org>,
        Kees Cook <keescook@chromium.org>
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From:   Eric Sandeen <sandeen@sandeen.net>
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Message-ID: <b89edbe2-0fc3-b99d-a54a-7a1053082f07@sandeen.net>
Date:   Thu, 21 Feb 2019 13:16:22 -0600
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Sender: linux-kernel-owner@vger.kernel.org
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Add test to build up bitmap range string and test the bitmap
proc handler.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

V2: set rc=0 for test success

however this still fails indeterminately for me.  Debugging, if I
save off the test write string and the read string, re-writing it to
the handler works fine.  My standalone test also works fine for 1000
iterations.  So I don't know what's going on here.

nb: test_modprobe & load_req_mod fail for me before we ever
get to this test, but commenting them out, my test runs as expected.
I'm new to this script, so careful review would be wise. 

Thanks,
-Eric


diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
index 584eb8ea780a..e531074f94bd 100755
--- a/tools/testing/selftests/sysctl/sysctl.sh
+++ b/tools/testing/selftests/sysctl/sysctl.sh
@@ -37,6 +37,7 @@ ALL_TESTS="$ALL_TESTS 0002:1:1"
 ALL_TESTS="$ALL_TESTS 0003:1:1"
 ALL_TESTS="$ALL_TESTS 0004:1:1"
 ALL_TESTS="$ALL_TESTS 0005:3:1"
+ALL_TESTS="$ALL_TESTS 0006:3:1"
 
 test_modprobe()
 {
@@ -149,6 +150,9 @@ reset_vals()
 		string_0001)
 			VAL="(none)"
 			;;
+		bitmap_0001)
+			VAL=""
+			;;
 		*)
 			;;
 	esac
@@ -548,6 +552,48 @@ run_stringtests()
 	test_rc
 }
 
+run_bitmaptest() {
+	# Total length of bitmaps string to use, a bit under
+	# the maximum input size of the test node
+	LENGTH=$((RANDOM % 65000))
+
+	# First bit to set
+	BIT=$((RANDOM % 1024))
+
+	# String containing our list of bits to set
+	TEST_STR=$BIT
+
+	# build up the string
+	while [ "${#TEST_STR}" -le "$LENGTH" ]; do
+		# Make sure next entry is discontiguous,
+		# skip ahead at least 2
+		BIT=$((BIT + $((2 + RANDOM % 10))))
+
+		# Add new bit to the list
+		TEST_STR="${TEST_STR},${BIT}"
+
+		# Randomly make it a range
+		if [ "$((RANDOM % 2))" -eq "1" ]; then
+			RANGE_END=$((BIT + $((1 + RANDOM % 10))))
+			TEST_STR="${TEST_STR}-${RANGE_END}"
+			BIT=$RANGE_END
+		fi
+	done
+
+	echo -n "Checking bitmap handler... "
+	echo $TEST_STR > /tmp/test_str
+	echo -n $TEST_STR > $TARGET 2> /dev/null
+
+	if verify "${TARGET}"; then
+		echo "FAIL" >&2
+		rc=1
+	else
+		echo "ok"
+		rc=0
+	fi
+	test_rc
+}
+
 sysctl_test_0001()
 {
 	TARGET="${SYSCTL}/int_0001"
@@ -605,6 +651,14 @@ sysctl_test_0005()
 	run_limit_digit_int_array
 }
 
+sysctl_test_0006()
+{
+	TARGET="${SYSCTL}/bitmap_0001"
+	reset_vals
+	ORIG=""
+	run_bitmaptest
+}
+
 list_tests()
 {
 	echo "Test ID list:"
@@ -618,6 +672,7 @@ list_tests()
 	echo "0003 x $(get_test_count 0003) - tests proc_dointvec()"
 	echo "0004 x $(get_test_count 0004) - tests proc_douintvec()"
 	echo "0005 x $(get_test_count 0005) - tests proc_douintvec() array"
+	echo "0006 x $(get_test_count 0006) - tests proc_do_large_bitmap"
 }
 
 test_reqs