[PATCH blktests] nvme/046: add test for unprivileged passthrough

[Kanchan Joshi]

Ths creates a non-root user "blktest46", alters permissions for
char-device node (/dev/ngX) and runs few passthrough commands.
At the end of the test, user is deleted and permissions are reverted.

Signed-off-by: Kanchan Joshi <joshi.k at samsung.com>
---
 tests/nvme/046     | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/nvme/046.out |  2 ++
 2 files changed, 57 insertions(+)
 create mode 100644 tests/nvme/046
 create mode 100644 tests/nvme/046.out

diff --git a/tests/nvme/046 b/tests/nvme/046
new file mode 100644
index 0000000..40bda62
--- /dev/null
+++ b/tests/nvme/046
@@ -0,0 +1,55 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-3.0+
+# Copyright (C) 2023 Kanchan Joshi, Samsung Electronics
+# Test for unprivileged passthrough
+
+. tests/nvme/rc
+
+DESCRIPTION="basic test for unprivileged passthrough on /dev/ngX"
+QUICK=1
+
+requires() {
+	_nvme_requires
+	_have_fio
+}
+
+device_requires() {
+	_require_test_dev_is_nvme
+}
+
+test_device() {
+	echo "Running ${TEST_NAME}"
+	local ngdev=${TEST_DEV/nvme/ng}
+	local usr="blktest46"
+	local perm=$(stat -c "%a" $ngdev)
+	local nsid=$(_test_dev_nvme_nsid)
+
+	useradd -m $usr
+	chmod g+r,o+r "$ngdev"
+
+	if ! su $usr -c "nvme io-passthru ${ngdev} -o 2 -l 4096 \
+		-n $nsid -r" >> "${FULL}" 2>&1; then
+		echo "Error: io-passthru read failed"
+	fi
+
+	if su $usr -c "echo hello | nvme io-passthru ${ngdev} -o 1 -l 4096 \
+		-n $nsid -r" >> "${FULL}" 2>&1; then
+		echo "Error: io-passthru write passed (unexpected)"
+	fi
+
+	if ! su $usr -c "nvme id-ns ${ngdev}" >> "${FULL}" 2>&1; then
+		echo "Error: id-ns failed"
+	fi
+
+	if ! su $usr -c "nvme id-ctrl ${ngdev}" >> "${FULL}" 2>&1; then
+		echo "Error: id-ctrl failed"
+	fi
+
+	if su $usr -c "nvme ns-descs ${ngdev}" >> "${FULL}" 2>&1; then
+		echo "Error: ns-descs passed (unexpected)"
+	fi
+
+	echo "Test complete"
+	chmod  $perm "$ngdev"
+	userdel -r  $usr >> "${FULL}" 2>&1
+}
diff --git a/tests/nvme/046.out b/tests/nvme/046.out
new file mode 100644
index 0000000..2b5fa6a
--- /dev/null
+++ b/tests/nvme/046.out
@@ -0,0 +1,2 @@
+Running nvme/046
+Test complete
-- 
2.25.1