[tests/selinux] pr775-checkpolicy-revdeps: Add a test for memory leak when SELinux mount options are used

[Ondrej Mosnacek <omosnace@redhat.com>]

            A new commit has been pushed.

            Repo   : tests/selinux
            Branch : pr775-checkpolicy-revdeps
            Commit : 7ce3757ef627376006115f0c6fdb972fcf86af4a
            Author : Ondrej Mosnacek <omosnace@redhat.com>
            Date   : 2023-05-16T13:54:25+00:00
            Stats  : +123/-0 in 2 file(s)
            URL    : https://src.fedoraproject.org/tests/selinux/c/7ce3757ef627376006115f0c6fdb972fcf86af4a?branch=pr775-checkpolicy-revdeps

            Log:
            Add a test for memory leak when SELinux mount options are used

Such memory leak was fixed upstream in the past. This test verifies that
it remains fixed.

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>

---
diff --git a/kernel/mount-options-memleak/main.fmf b/kernel/mount-options-memleak/main.fmf
new file mode 100644
index 0000000..e54f7b6
--- /dev/null
+++ b/kernel/mount-options-memleak/main.fmf
@@ -0,0 +1,17 @@
+summary: Mount options memory leak test
+description: |
+    Test that mounting with SELinux mount options doesn't leave behind
+    memory leaks.
+contact: Ondrej Mosnacek <omosnace@redhat.com>
+component:
+- kernel
+framework: beakerlib
+duration: 1h
+tier: 2
+enabled: true
+adjust:
+    enabled: false
+    when: distro < rhel-7
+    because: RHEL-6 and below are not worth supporting by this test
+link:
+  - verifies: https://bugzilla.redhat.com/show_bug.cgi?id=2187402

diff --git a/kernel/mount-options-memleak/runtest.sh b/kernel/mount-options-memleak/runtest.sh
new file mode 100755
index 0000000..c5e86e2
--- /dev/null
+++ b/kernel/mount-options-memleak/runtest.sh
@@ -0,0 +1,106 @@
+#!/bin/bash
+# vim: dict=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+# SPDX-License-Identifier: GPLv2
+# Copyright (c) 2023 Red Hat, Inc.
+# Author: Ondrej Mosnacek <omosnace@redhat.com>
+
+# Include Beakerlib environment
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+# Beaker compat
+if [ -n "$JOBID" ] && [ -n "$TESTID" ]; then
+    function tmt-reboot() { rstrnt-reboot; }
+    TMT_REBOOT_COUNT="$REBOOT_COUNT"
+fi
+
+function installDepsYum() {
+    local yum="$1"; shift
+
+    if "$yum" --help | grep -q -- --skip-broken; then
+        "$yum" install -y --skip-broken $*
+    else
+        for req in $*; do
+            if ! rpm -q --quiet --whatprovides "$req"; then
+                "$yum" install -y "$req" || true
+            fi
+        done
+    fi
+}
+
+function installDeps() {
+    if type yum >/dev/null; then
+        installDepsYum yum "$@"
+    elif type dnf >/dev/null; then
+        installDepsYum dnf "$@"
+    fi
+}
+
+rlJournalStart
+if [ $TMT_REBOOT_COUNT -lt 1 ]; then
+    rlPhaseStartSetup
+        rlRun "uname -r" 0 "Print initial running kernel version"
+
+        uname="$(uname -r)"
+        raw_uname="${uname%+*}"
+        debug_uname="${raw_uname}+debug"
+        echo "$uname" >"$BEAKERLIB_DIR/orig_uname"
+        echo "$debug_uname" >"$BEAKERLIB_DIR/debug_uname"
+        if [ "$uname" = "$debug_uname" ]; then
+            rlLog "Already running the debug kernel, nice!"
+        else
+            rlLog "Install and boot the debug kernel"
+
+            rlRun "installDeps kernel-debug-$raw_uname"
+            rlRun "grubby --set-default /boot/vmlinuz-$debug_uname"
+        fi
+
+        rlRun "grubby --update-kernel /boot/vmlinuz-$debug_uname --args kmemleak=on" 0 \
+            "Enable kmemleak on the debug kernel"
+        tmt-reboot
+fi
+if [ $TMT_REBOOT_COUNT -lt 2 ]; then
+        rlRun "uname -r" 0 "Print running kernel version after reboot"
+
+        rlRun "mkdir -p /mnt/test_mount" 0 \
+            "Create a directory for the test mount"
+    rlPhaseEnd
+
+    rlPhaseStartTest
+        rlRun "echo clear > /sys/kernel/debug/kmemleak" 0 \
+            "Clear the kmemleak buffer"
+
+        rlRun "mount -t tmpfs -o context=system_u:object_r:user_tmp_t:s0 tmpfs /mnt/test_mount" 0 \
+            "Do a context mount"
+        rlRun "umount /mnt/test_mount" 0 \
+            "Unmount the context mount"
+
+        # For whatever reason this needs to be run twice...
+        rlRun "echo scan > /sys/kernel/debug/kmemleak" 0 \
+            "Trigger a kmemleak scan"
+        rlRun "cat /sys/kernel/debug/kmemleak >/dev/null" 0 \
+            "Dump the kmemleak buffer once"
+        rlRun "echo scan > /sys/kernel/debug/kmemleak" 0 \
+            "Trigger a second kmemleak scan"
+
+        rlLog "Check that /sys/kernel/debug/kmemleak is empty"
+        rlAssertNotDiffer /sys/kernel/debug/kmemleak /dev/null
+        rlRun "cat /sys/kernel/debug/kmemleak" 0 \
+            "Dump the kmemleak buffer"
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlRun "rmdir /mnt/test_mount" 0 \
+            "Remove the directory for the test mount"
+        uname="$(cat "$BEAKERLIB_DIR/orig_uname")"
+        debug_uname="$(cat "$BEAKERLIB_DIR/debug_uname")"
+        rlRun "grubby --update-kernel /boot/vmlinuz-$debug_uname --remove-args kmemleak=on" 0 \
+            "Undo kmemleak enabling"
+        rlRun "grubby --set-default /boot/vmlinuz-$uname" 0 \
+            "Switch the default back to the initial kernel version"
+        tmt-reboot
+fi
+        rlRun "uname -r" 0 \
+            "Print running kernel version after cleanup reboot"
+    rlPhaseEnd
+rlJournalPrintText
+rlJournalEnd