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79b9e326a1
Ensure that the alias found matches the device tree specification v0.4:
Each property of the /aliases node defines an alias. The property
name specifies the alias name. The property value specifies the full
path to a node in the devicetree.
This protects against a stack overflow caused by
fdt_path_offset_namelen(fdt, path, namelen)
calling
fdt_path_offset(fdt, fdt_get_alias_namelen(fdt, path, namelen))
leading to infinite recursion on DTs with "circular" aliases.
This fix was originally written by Mike McTernan for Android in [1].
[1]: https://android.googlesource.com/platform/external/dtc/+/9308e7f9772bd226fea9925b1fc4d53c127ed4d5
Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>
Acked-by: Mike McTernan <mikemcternan@google.com>
Message-ID: <20231010092725.63h7c45p2fnmj577@google.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
// SPDX-License-Identifier: LGPL-2.1-or-later
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/*
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* libfdt - Flat Device Tree manipulation
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* Testcase for fdt_get_alias()
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* Copyright (C) 2006 David Gibson, IBM Corporation.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <libfdt.h>
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#include "tests.h"
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#include "testdata.h"
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static void check_alias(void *fdt, const char *path, const char *alias)
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{
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const char *aliaspath;
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aliaspath = fdt_get_alias(fdt, alias);
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if (!path && !aliaspath)
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return;
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if (!aliaspath)
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FAIL("fdt_get_alias(%s) failed\n", alias);
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if (!path)
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FAIL("fdt_get_alias(%s) returned %s instead of NULL",
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alias, aliaspath);
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if (strcmp(aliaspath, path) != 0)
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FAIL("fdt_get_alias(%s) returned %s instead of %s\n",
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alias, aliaspath, path);
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}
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int main(int argc, char *argv[])
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{
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void *fdt;
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test_init(argc, argv);
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fdt = load_blob_arg(argc, argv);
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check_alias(fdt, NULL, "empty");
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check_alias(fdt, NULL, "nonull");
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check_alias(fdt, NULL, "relative");
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check_alias(fdt, "/subnode@1", "s1");
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check_alias(fdt, "/subnode@1/subsubnode", "ss1");
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check_alias(fdt, "/subnode@1/subsubnode/subsubsubnode", "sss1");
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check_alias(fdt, NULL, "loop"); // Might trigger a stack overflow
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PASS();
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}
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