ZTS: testing for leaked key mappings in encrypted non-raw send

This test covers a bug fixed by commit ea74cde: performing an
incremental non-raw send from an encrypted filesystem followed by
exporting the pool. Before that commit, exporting the sending pool
in this scenario would trigger a panic:

VERIFY(avl_is_empty(&sk->sk_dsl_keys)) failed
PANIC at dsl_crypt.c:353:spa_keystore_fini()
Call Trace:
 spl_dumpstack+0x29/0x2f [spl]
 spl_panic+0xd1/0xe9 [spl]
 spl_assert.constprop.0+0x1a/0x30 [zfs]
 spa_keystore_fini+0xc2/0xf0 [zfs]
 spa_deactivate+0x25f/0x610 [zfs]
 spa_evict_all+0xf4/0x200 [zfs]
 spa_fini+0x13/0x140 [zfs]
 zfs_kmod_fini+0x72/0xc0 [zfs]
 openzfs_fini_os+0x13/0x3a [zfs]
 openzfs_fini+0x9/0x6b8 [zfs]

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #17366

tests/runfiles/common.run

@@ -947,7 +947,7 @@ tests = ['recv_dedup', 'recv_dedup_encrypted_zvol', 'rsend_001_pos',
     'send_spill_block', 'send_holds', 'send_hole_birth', 'send_mixed_raw',
     'send-wR_encrypted_zvol', 'send_partial_dataset', 'send_invalid',
     'send_doall', 'send_raw_spill_block', 'send_raw_ashift',
-    'send_raw_large_blocks']
+    'send_raw_large_blocks', 'send_leak_keymaps']
 tags = ['functional', 'rsend']
 
 [tests/functional/scrub_mirror]

tests/zfs-tests/tests/Makefile.am

@@ -1984,6 +1984,7 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
 	functional/rsend/send_holds.ksh \
 	functional/rsend/send_hole_birth.ksh \
 	functional/rsend/send_invalid.ksh \
+	functional/rsend/send_leak_keymaps.ksh \
 	functional/rsend/send-L_toggle.ksh \
 	functional/rsend/send_mixed_raw.ksh \
 	functional/rsend/send_partial_dataset.ksh \

tests/zfs-tests/tests/functional/rsend/send_leak_keymaps.ksh

@@ -0,0 +1,82 @@
+#!/bin/ksh -p
+# SPDX-License-Identifier: CDDL-1.0
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2025 by George Amanakis. All rights reserved.
+#
+
+. $STF_SUITE/tests/functional/rsend/rsend.kshlib
+
+#
+# DESCRIPTION:
+# Verify that an incremental non-raw zfs send from an encrypted filesystem
+# does not leak any keys or key mappings.
+#
+# STRATEGY:
+# 1. Create a new encrypted filesystem
+# 2. Write some files and create snapshots.
+# 3. Send to a new filesystem
+# 4. Do an incremental (-I) send and before that access all properties on the
+#	sending filesystem (emulate sanoid)
+# 5. Export and re-import the pool. Upon exporting the pool if any keys/key
+#	mappings leaked a panic will occur.
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	datasetexists $TESTPOOL/$TESTFS2 && \
+		destroy_dataset $TESTPOOL/$TESTFS2 -r
+	datasetexists $TESTPOOL/recv && \
+		destroy_dataset $TESTPOOL/recv -r
+	[[ -f $keyfile ]] && log_must rm $keyfile
+}
+log_onexit cleanup
+
+log_assert "Verify non-raw send with encryption does not leak any key mappings"
+
+typeset keyfile=/$TESTPOOL/pkey
+
+# Create an encrypted dataset
+log_must eval "echo 'password' > $keyfile"
+log_must zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=file://$keyfile $TESTPOOL/$TESTFS2
+
+log_must dd if=/dev/urandom of=/$TESTPOOL/$TESTFS2/testfile bs=128K count=4 \
+	status=none
+
+for i in $(seq 0 20); do
+    log_note "Taking snapshots"
+    log_must zfs snapshot $TESTPOOL/$TESTFS2@snap_$i
+    log_must dd if=/dev/urandom of=/$TESTPOOL/$TESTFS2/testfile bs=128K \
+	    count=4 status=none
+done
+
+log_must eval "zfs send $TESTPOOL/$TESTFS2@snap_0 | zfs recv $TESTPOOL/recv"
+
+for i in $(seq 3 3 20); do
+    log_note "Sending incremental snapshot snap_$((i - 3)) -> snap_$i"
+    log_must zfs get -Hpd 1 -t snapshot all $TESTPOOL/$TESTFS2 &>/dev/null
+    log_must eval "zfs send -I $TESTPOOL/$TESTFS2@snap_$((i - 3)) \
+	$TESTPOOL/$TESTFS2@snap_$i | zfs recv $TESTPOOL/recv"
+done
+
+log_must zpool export $TESTPOOL
+log_must zpool import $TESTPOOL
+
+log_pass "Verify non-raw send with encryption does not leak any key mappings"