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@@ -0,0 +1,50 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Test device path functions
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+ *
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+ * Copyright (c) 2020 Heinrich Schuchardt <xypron.glpk@gmx.de>
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+ */
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+
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+#include <common.h>
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+#include <efi_loader.h>
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+#include <test/lib.h>
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+#include <test/test.h>
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+#include <test/ut.h>
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+
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+static int lib_test_efi_dp_check_length(struct unit_test_state *uts)
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+{
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+ /* end of device path */
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+ u8 d1[] __aligned(2) = {
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+ 0x7f, 0xff, 0x04, 0x00 };
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+ /* device path node with length less then 4 */
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+ u8 d2[] __aligned(2) = {
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+ 0x01, 0x02, 0x02, 0x00, 0x04, 0x00, 0x7f, 0xff, 0x04, 0x00 };
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+ /* well formed device path */
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+ u8 d3[] __aligned(2) = {
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+ 0x03, 0x02, 0x08, 0x00, 0x01, 0x00, 0x01, 0x00,
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+ 0x7f, 0xff, 0x04, 0x00 };
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+
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+ struct efi_device_path *p1 = (struct efi_device_path *)d1;
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+ struct efi_device_path *p2 = (struct efi_device_path *)d2;
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+ struct efi_device_path *p3 = (struct efi_device_path *)d3;
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+
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+ ut_asserteq((ssize_t)-EINVAL, efi_dp_check_length(p1, SIZE_MAX));
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+ ut_asserteq((ssize_t)sizeof(d1), efi_dp_check_length(p1, sizeof(d1)));
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+ ut_asserteq((ssize_t)sizeof(d1),
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+ efi_dp_check_length(p1, sizeof(d1) + 4));
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+ ut_asserteq((ssize_t)-1, efi_dp_check_length(p1, sizeof(d1) - 1));
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+
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+ ut_asserteq((ssize_t)-1, efi_dp_check_length(p2, sizeof(d2)));
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+
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+ ut_asserteq((ssize_t)-1, efi_dp_check_length(p3, sizeof(d3) - 1));
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+ ut_asserteq((ssize_t)sizeof(d3), efi_dp_check_length(p3, sizeof(d3)));
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+ ut_asserteq((ssize_t)sizeof(d3), efi_dp_check_length(p3, SSIZE_MAX));
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+ ut_asserteq((ssize_t)-EINVAL,
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+ efi_dp_check_length(p3, (size_t)SSIZE_MAX + 1));
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+ ut_asserteq((ssize_t)sizeof(d3),
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+ efi_dp_check_length(p3, sizeof(d3) + 4));
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+
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+ return 0;
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+}
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+
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+LIB_TEST(lib_test_efi_dp_check_length, 0);
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