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authorKees Cook <keescook@chromium.org>2014-07-14 14:38:12 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-17 18:44:19 -0700
commit0a8adf584759cbcbce5d88d419db01a8d0373abf (patch)
tree30f1901d7c12756f558d259d89299c505697b41c /tools
parentb1425189d0f928babb62bdc0609a4cd4d341654d (diff)
downloadlinux-next-0a8adf584759cbcbce5d88d419db01a8d0373abf.tar.gz
test: add firmware_class loader test
This provides a simple interface to trigger the firmware_class loader to test built-in, filesystem, and user helper modes. Additionally adds tests via the new interface to the selftests tree. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/Makefile1
-rw-r--r--tools/testing/selftests/firmware/Makefile27
-rw-r--r--tools/testing/selftests/firmware/fw_filesystem.sh62
-rw-r--r--tools/testing/selftests/firmware/fw_userhelper.sh89
4 files changed, 179 insertions, 0 deletions
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index e66e710cc595..5c2bf8ec18f3 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -11,6 +11,7 @@ TARGETS += vm
TARGETS += powerpc
TARGETS += user
TARGETS += sysctl
+TARGETS += firmware
all:
for TARGET in $(TARGETS); do \
diff --git a/tools/testing/selftests/firmware/Makefile b/tools/testing/selftests/firmware/Makefile
new file mode 100644
index 000000000000..e23cce0bbc3a
--- /dev/null
+++ b/tools/testing/selftests/firmware/Makefile
@@ -0,0 +1,27 @@
+# Makefile for firmware loading selftests
+
+# No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
+all:
+
+fw_filesystem:
+ @if /bin/sh ./fw_filesystem.sh ; then \
+ echo "fw_filesystem: ok"; \
+ else \
+ echo "fw_filesystem: [FAIL]"; \
+ exit 1; \
+ fi
+
+fw_userhelper:
+ @if /bin/sh ./fw_userhelper.sh ; then \
+ echo "fw_userhelper: ok"; \
+ else \
+ echo "fw_userhelper: [FAIL]"; \
+ exit 1; \
+ fi
+
+run_tests: all fw_filesystem fw_userhelper
+
+# Nothing to clean up.
+clean:
+
+.PHONY: all clean run_tests fw_filesystem fw_userhelper
diff --git a/tools/testing/selftests/firmware/fw_filesystem.sh b/tools/testing/selftests/firmware/fw_filesystem.sh
new file mode 100644
index 000000000000..3fc6c10c2479
--- /dev/null
+++ b/tools/testing/selftests/firmware/fw_filesystem.sh
@@ -0,0 +1,62 @@
+#!/bin/sh
+# This validates that the kernel will load firmware out of its list of
+# firmware locations on disk. Since the user helper does similar work,
+# we reset the custom load directory to a location the user helper doesn't
+# know so we can be sure we're not accidentally testing the user helper.
+set -e
+
+modprobe test_firmware
+
+DIR=/sys/devices/virtual/misc/test_firmware
+
+OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
+OLD_FWPATH=$(cat /sys/module/firmware_class/parameters/path)
+
+FWPATH=$(mktemp -d)
+FW="$FWPATH/test-firmware.bin"
+
+test_finish()
+{
+ echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
+ echo -n "$OLD_PATH" >/sys/module/firmware_class/parameters/path
+ rm -f "$FW"
+ rmdir "$FWPATH"
+}
+
+trap "test_finish" EXIT
+
+# Turn down the timeout so failures don't take so long.
+echo 1 >/sys/class/firmware/timeout
+# Set the kernel search path.
+echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
+
+# This is an unlikely real-world firmware content. :)
+echo "ABCD0123" >"$FW"
+
+NAME=$(basename "$FW")
+
+# Request a firmware that doesn't exist, it should fail.
+echo -n "nope-$NAME" >"$DIR"/trigger_request
+if diff -q "$FW" /dev/test_firmware >/dev/null ; then
+ echo "$0: firmware was not expected to match" >&2
+ exit 1
+else
+ echo "$0: timeout works"
+fi
+
+# This should succeed via kernel load or will fail after 1 second after
+# being handed over to the user helper, which won't find the fw either.
+if ! echo -n "$NAME" >"$DIR"/trigger_request ; then
+ echo "$0: could not trigger request" >&2
+ exit 1
+fi
+
+# Verify the contents are what we expect.
+if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
+ echo "$0: firmware was not loaded" >&2
+ exit 1
+else
+ echo "$0: filesystem loading works"
+fi
+
+exit 0
diff --git a/tools/testing/selftests/firmware/fw_userhelper.sh b/tools/testing/selftests/firmware/fw_userhelper.sh
new file mode 100644
index 000000000000..6efbade12139
--- /dev/null
+++ b/tools/testing/selftests/firmware/fw_userhelper.sh
@@ -0,0 +1,89 @@
+#!/bin/sh
+# This validates that the kernel will fall back to using the user helper
+# to load firmware it can't find on disk itself. We must request a firmware
+# that the kernel won't find, and any installed helper (e.g. udev) also
+# won't find so that we can do the load ourself manually.
+set -e
+
+modprobe test_firmware
+
+DIR=/sys/devices/virtual/misc/test_firmware
+
+OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
+
+FWPATH=$(mktemp -d)
+FW="$FWPATH/test-firmware.bin"
+
+test_finish()
+{
+ echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
+ rm -f "$FW"
+ rmdir "$FWPATH"
+}
+
+load_fw()
+{
+ local name="$1"
+ local file="$2"
+
+ # This will block until our load (below) has finished.
+ echo -n "$name" >"$DIR"/trigger_request &
+
+ # Give kernel a chance to react.
+ local timeout=10
+ while [ ! -e "$DIR"/"$name"/loading ]; do
+ sleep 0.1
+ timeout=$(( $timeout - 1 ))
+ if [ "$timeout" -eq 0 ]; then
+ echo "$0: firmware interface never appeared" >&2
+ exit 1
+ fi
+ done
+
+ echo 1 >"$DIR"/"$name"/loading
+ cat "$file" >"$DIR"/"$name"/data
+ echo 0 >"$DIR"/"$name"/loading
+
+ # Wait for request to finish.
+ wait
+}
+
+trap "test_finish" EXIT
+
+# This is an unlikely real-world firmware content. :)
+echo "ABCD0123" >"$FW"
+NAME=$(basename "$FW")
+
+# Test failure when doing nothing (timeout works).
+echo 1 >/sys/class/firmware/timeout
+echo -n "$NAME" >"$DIR"/trigger_request
+if diff -q "$FW" /dev/test_firmware >/dev/null ; then
+ echo "$0: firmware was not expected to match" >&2
+ exit 1
+else
+ echo "$0: timeout works"
+fi
+
+# Put timeout high enough for us to do work but not so long that failures
+# slow down this test too much.
+echo 4 >/sys/class/firmware/timeout
+
+# Load this script instead of the desired firmware.
+load_fw "$NAME" "$0"
+if diff -q "$FW" /dev/test_firmware >/dev/null ; then
+ echo "$0: firmware was not expected to match" >&2
+ exit 1
+else
+ echo "$0: firmware comparison works"
+fi
+
+# Do a proper load, which should work correctly.
+load_fw "$NAME" "$FW"
+if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
+ echo "$0: firmware was not loaded" >&2
+ exit 1
+else
+ echo "$0: user helper firmware loading works"
+fi
+
+exit 0