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0a8adf5847
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>
63 lines
1.7 KiB
Bash
63 lines
1.7 KiB
Bash
#!/bin/sh
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# This validates that the kernel will load firmware out of its list of
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# firmware locations on disk. Since the user helper does similar work,
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# we reset the custom load directory to a location the user helper doesn't
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# know so we can be sure we're not accidentally testing the user helper.
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set -e
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modprobe test_firmware
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DIR=/sys/devices/virtual/misc/test_firmware
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OLD_TIMEOUT=$(cat /sys/class/firmware/timeout)
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OLD_FWPATH=$(cat /sys/module/firmware_class/parameters/path)
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FWPATH=$(mktemp -d)
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FW="$FWPATH/test-firmware.bin"
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test_finish()
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{
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echo "$OLD_TIMEOUT" >/sys/class/firmware/timeout
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echo -n "$OLD_PATH" >/sys/module/firmware_class/parameters/path
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rm -f "$FW"
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rmdir "$FWPATH"
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}
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trap "test_finish" EXIT
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# Turn down the timeout so failures don't take so long.
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echo 1 >/sys/class/firmware/timeout
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# Set the kernel search path.
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echo -n "$FWPATH" >/sys/module/firmware_class/parameters/path
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# This is an unlikely real-world firmware content. :)
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echo "ABCD0123" >"$FW"
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NAME=$(basename "$FW")
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# Request a firmware that doesn't exist, it should fail.
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echo -n "nope-$NAME" >"$DIR"/trigger_request
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if diff -q "$FW" /dev/test_firmware >/dev/null ; then
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echo "$0: firmware was not expected to match" >&2
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exit 1
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else
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echo "$0: timeout works"
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fi
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# This should succeed via kernel load or will fail after 1 second after
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# being handed over to the user helper, which won't find the fw either.
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if ! echo -n "$NAME" >"$DIR"/trigger_request ; then
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echo "$0: could not trigger request" >&2
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exit 1
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fi
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# Verify the contents are what we expect.
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if ! diff -q "$FW" /dev/test_firmware >/dev/null ; then
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echo "$0: firmware was not loaded" >&2
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exit 1
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else
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echo "$0: filesystem loading works"
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fi
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exit 0
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