test_firmware: test three firmware kernel configs using a proc knob

Since we now have knobs to twiddle what used to be set on kernel
configurations we can build one base kernel configuration and modify
behaviour to mimic such kernel configurations to test them.

Provided you build a kernel with:

CONFIG_TEST_FIRMWARE=y
CONFIG_FW_LOADER=y
CONFIG_FW_LOADER_USER_HELPER=y
CONFIG_IKCONFIG=y
CONFIG_IKCONFIG_PROC=y

We should now be able test all possible kernel configurations
when FW_LOADER=y. Note that when FW_LOADER=m we just don't provide
the built-in functionality of the built-in firmware.

If you're on an old kernel and either don't have /proc/config.gz
(CONFIG_IKCONFIG_PROC) or haven't enabled CONFIG_FW_LOADER_USER_HELPER
we cannot run these dynamic tests, so just run both scripts just
as we used to before making blunt assumptions about your setup
and requirements exactly as we did before.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 122 insertions, 1 deletions

diff --git a/tools/testing/selftests/firmware/Makefile b/tools/testing/selftests/firmware/Makefile
index 1894d625af2da..826f38d5dd19f 100644
--- a/tools/testing/selftests/firmware/Makefile
+++ b/tools/testing/selftests/firmware/Makefile
@@ -3,7 +3,7 @@
 # No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
 all:
 
-TEST_PROGS := fw_filesystem.sh fw_fallback.sh
+TEST_PROGS := fw_run_tests.sh
 
 include ../lib.mk
 
diff --git a/tools/testing/selftests/firmware/fw_lib.sh b/tools/testing/selftests/firmware/fw_lib.sh
index e3cc4483fdba6..98dceb847ba02 100755
--- a/tools/testing/selftests/firmware/fw_lib.sh
+++ b/tools/testing/selftests/firmware/fw_lib.sh
@@ -47,6 +47,34 @@ check_setup()
 {
 	HAS_FW_LOADER_USER_HELPER="$(kconfig_has CONFIG_FW_LOADER_USER_HELPER=y)"
 	HAS_FW_LOADER_USER_HELPER_FALLBACK="$(kconfig_has CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y)"
+	PROC_FW_IGNORE_SYSFS_FALLBACK="0"
+	PROC_FW_FORCE_SYSFS_FALLBACK="0"
+
+	if [ -z $PROC_SYS_DIR ]; then
+		PROC_SYS_DIR="/proc/sys/kernel"
+	fi
+
+	FW_PROC="${PROC_SYS_DIR}/firmware_config"
+	FW_FORCE_SYSFS_FALLBACK="$FW_PROC/force_sysfs_fallback"
+	FW_IGNORE_SYSFS_FALLBACK="$FW_PROC/ignore_sysfs_fallback"
+
+	if [ -f $FW_FORCE_SYSFS_FALLBACK ]; then
+		PROC_FW_FORCE_SYSFS_FALLBACK="$(cat $FW_FORCE_SYSFS_FALLBACK)"
+	fi
+
+	if [ -f $FW_IGNORE_SYSFS_FALLBACK ]; then
+		PROC_FW_IGNORE_SYSFS_FALLBACK="$(cat $FW_IGNORE_SYSFS_FALLBACK)"
+	fi
+
+	if [ "$PROC_FW_FORCE_SYSFS_FALLBACK" = "1" ]; then
+		HAS_FW_LOADER_USER_HELPER="yes"
+		HAS_FW_LOADER_USER_HELPER_FALLBACK="yes"
+	fi
+
+	if [ "$PROC_FW_IGNORE_SYSFS_FALLBACK" = "1" ]; then
+		HAS_FW_LOADER_USER_HELPER_FALLBACK="no"
+		HAS_FW_LOADER_USER_HELPER="no"
+	fi
 
 	if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
 	       OLD_TIMEOUT="$(cat /sys/class/firmware/timeout)"
@@ -76,6 +104,28 @@ setup_tmp_file()
 	fi
 }
 
+proc_set_force_sysfs_fallback()
+{
+	if [ -f $FW_FORCE_SYSFS_FALLBACK ]; then
+		echo -n $1 > $FW_FORCE_SYSFS_FALLBACK
+		check_setup
+	fi
+}
+
+proc_set_ignore_sysfs_fallback()
+{
+	if [ -f $FW_IGNORE_SYSFS_FALLBACK ]; then
+		echo -n $1 > $FW_IGNORE_SYSFS_FALLBACK
+		check_setup
+	fi
+}
+
+proc_restore_defaults()
+{
+	proc_set_force_sysfs_fallback 0
+	proc_set_ignore_sysfs_fallback 0
+}
+
 test_finish()
 {
 	if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
@@ -93,6 +143,7 @@ test_finish()
 	if [ -d $FWPATH ]; then
 		rm -rf "$FWPATH"
 	fi
+	proc_restore_defaults
 }
 
 kconfig_has()
diff --git a/tools/testing/selftests/firmware/fw_run_tests.sh b/tools/testing/selftests/firmware/fw_run_tests.sh
new file mode 100755
index 0000000000000..06d638e9dc627
--- /dev/null
+++ b/tools/testing/selftests/firmware/fw_run_tests.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+# This runs all known tests across all known possible configurations we could
+# emulate in one run.
+
+set -e
+
+TEST_DIR=$(dirname $0)
+source $TEST_DIR/fw_lib.sh
+
+export HAS_FW_LOADER_USER_HELPER=""
+export HAS_FW_LOADER_USER_HELPER_FALLBACK=""
+
+run_tests()
+{
+	proc_set_force_sysfs_fallback $1
+	proc_set_ignore_sysfs_fallback $2
+	$TEST_DIR/fw_filesystem.sh
+
+	proc_set_force_sysfs_fallback $1
+	proc_set_ignore_sysfs_fallback $2
+	$TEST_DIR/fw_fallback.sh
+}
+
+run_test_config_0001()
+{
+	echo "-----------------------------------------------------"
+	echo "Running kernel configuration test 1 -- rare"
+	echo "Emulates:"
+	echo "CONFIG_FW_LOADER=y"
+	echo "CONFIG_FW_LOADER_USER_HELPER=n"
+	echo "CONFIG_FW_LOADER_USER_HELPER_FALLBACK=n"
+	run_tests 0 1
+}
+
+run_test_config_0002()
+{
+	echo "-----------------------------------------------------"
+	echo "Running kernel configuration test 2 -- distro"
+	echo "Emulates:"
+	echo "CONFIG_FW_LOADER=y"
+	echo "CONFIG_FW_LOADER_USER_HELPER=y"
+	echo "CONFIG_FW_LOADER_USER_HELPER_FALLBACK=n"
+	proc_set_ignore_sysfs_fallback 0
+	run_tests 0 0
+}
+
+run_test_config_0003()
+{
+	echo "-----------------------------------------------------"
+	echo "Running kernel configuration test 3 -- android"
+	echo "Emulates:"
+	echo "CONFIG_FW_LOADER=y"
+	echo "CONFIG_FW_LOADER_USER_HELPER=y"
+	echo "CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y"
+	run_tests 1 0
+}
+
+check_mods
+check_setup
+
+if [ -f $FW_FORCE_SYSFS_FALLBACK ]; then
+	run_test_config_0001
+	run_test_config_0002
+	run_test_config_0003
+else
+	echo "Running basic kernel configuration, working with your config"
+	run_test
+fi