{"id":4762,"date":"2022-03-31T22:44:51","date_gmt":"2022-03-31T13:44:51","guid":{"rendered":"https:\/\/column.prime-strategy.co.jp\/?p=4762"},"modified":"2026-02-17T02:08:56","modified_gmt":"2026-02-16T17:08:56","slug":"post-4762","status":"publish","type":"post","link":"https:\/\/kusanagi.tokyo\/column\/archives\/column_4762","title":{"rendered":"PHP\u306e\u6700\u65b0\u72b6\u6cc1\uff1aPHP\u306e\u91cd\u5927\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6b20\u9665\u306e\u4fee\u6b63\u7248\u30ea\u30ea\u30fc\u30b9\uff08\u7b2c23\u56de\uff09"},"content":{"rendered":"\n

\u6625\u3092\u8fce\u3048\u3066\u6696\u304b\u3044\u65e5\u304c\u5897\u3048\u3066\u304d\u307e\u3057\u305f\u304c\uff0c\u6b21\u306e\u30de\u30a4\u30ca\u30fc\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3042\u308bPHP 8.2\u306e\u958b\u767a\u3082\u5c11\u3057\u305a\u3064\u9032\u3093\u3067\u3044\u307e\u3059\uff0e PHP\u958b\u767a\u7528\u30e1\u30fc\u30ea\u30f3\u30b0\u30ea\u30b9\u30c8\uff08php-internals\uff09\u3067\u306f\uff0c\u65b0\u3057\u3044\u6a5f\u80fd\u306b\u95a2\u3059\u308b\u8b70\u8ad6\u304c\u884c\u308f\u308c\u3066\u304a\u308a\uff0cPHP-RFC\u3067\u65b0\u3057\u3044\u6a5f\u80fd\u306e\u63d0\u6848\u304a\u3088\u3073\u6295\u7968\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\uff0e<\/p>\n\n\n\n

\u4e00\u65b9\uff0c2\u670818\u65e5\u306b\u6bd4\u8f03\u7684\u5f71\u97ff\u5ea6\u304c\u5927\u304d\u3044\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u95a2\u9023\u306ePHP\u306e\u30ea\u30ea\u30fc\u30b9\u304c\u884c\u308f\u308c\u307e\u3057\u305f\uff0e\u672c\u7a3f\u3067\u306f\uff0c\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u95a2\u9023\u4fee\u6b63\u30ea\u30ea\u30fc\u30b9\u306e\u60c5\u5831\u3068PHP 8.2\u306b\u5411\u3051\u3066\u63d0\u6848\u3055\u308c\u3066\u3044\u308b\u6a5f\u80fd\u306e\u7d39\u4ecb\u3092\u884c\u3044\u307e\u3059\uff0e<\/p>\n\n\n\n

PHP8\u306e\u6700\u65b0\u7248\u3067\u3042\u308bPHP 8.1.0\u304c11\u670825\u65e5\u306b\u6b63\u5f0f\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305f\u5f8c\uff0cPHP\u306e\u958b\u767a\u9663\u306f\u6b21\u306e\u30de\u30a4\u30ca\u30fc\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3042\u308bPHP 8.2\u306e\u958b\u767a\u3092\u958b\u59cb\u3057\u307e\u3057\u305f\uff0e\u672c\u7a3f\u3067\u306f\uff0cPHP 8.2\u306b\u304a\u3051\u308b\u73fe\u6642\u70b9\u3067\u306e\u5909\u66f4\u70b9\u3092\u542b\u3080PHP\u95a2\u9023\u306e\u6700\u65b0\u306e\u72b6\u6cc1\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3059\uff0eCVE-2021-21708<\/p>\n\n\n\n

Filter_validate_float\u95a2\u6570\u3068min\/max limit\u3092\u7528\u3044\u305f\u969b\uff0c\u30d5\u30a3\u30eb\u30bf\u304c\u5931\u6557\u3059\u308b\u3068<\/p>\n\n\n\n

\u958b\u653e\u5f8c\u306e\u30e1\u30e2\u30ea\u3092\u4f7f\u7528\u3057\u3066\u3057\u307e\u3046use after free\u304c\u767a\u751f\u3057\uff0c\u30ea\u30e2\u30fc\u30c8\u30b3\u30fc\u30c9\u5b9f\u884c\u306e\u8106\u5f31\u6027\u304c\u767a\u751f\u3057\u307e\u3059\uff0e<\/p>\n\n\n\n

\u30d5\u30a3\u30eb\u30bf\u6a5f\u80fd\u306b\u95a2\u3059\u308b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8106\u5f31\u6027\u306b\u3088\u308a\u4fee\u6b63\u7248\u30ea\u30ea\u30fc\u30b9<\/h4>\n\n\n\n

\u3000PHP\u306e\u5168\u3066\u306e\u30ea\u30ea\u30fc\u30b9\u306b\u5171\u901a\u3059\u308b\u6bd4\u8f03\u7684\u5f71\u97ff\u5ea6\u304c\u5927\u304d\u3044\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u8106\u5f31\u6027\u304c\u767a\u898b\u3055\u308c\uff0c2\u670818\u65e5\u306b\u305d\u308c\u305e\u308c PHP 7.4\uff0c8.0\uff0c8.1\u306b\u95a2\u3059\u308b\u4fee\u6b63\u7248\u3068\u3057\u3066PHP 7.4.28\uff0c8.0.16\uff0c8.1.3\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3057\u305f\uff0e\u3059\u3079\u3066\u306ePHP\u30e6\u30fc\u30b6\u306f\uff0c\u4fee\u6b63\u5f8c\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3078\u306e\u65e9\u671f\u306e\u66f4\u65b0\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\uff0e\u306a\u304a\uff0cPHP 7.\uff14\u306f\u3059\u3067\u306b\u901a\u5e38\u306e\u30d0\u30b0\u4fee\u6b63\u671f\u9593\u306f\u7d42\u4e86\u3057\u3066\u304a\u308a\uff0c\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4fee\u6b63\u306e\u307f\u304c\u884c\u308f\u308c\u308b\u671f\u9593\u3068\u306a\u3063\u3066\u3044\u307e\u3059\uff0e\u95a2\u9023\u3057\u3066\uff0c\u5404\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u540c\u69d8\u306e\u4fee\u6b63\u304c\u9069\u7528\u3055\u308c\u305f\u7248\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\uff0e<\/p>\n\n\n\n

\u306a\u304a\uff0c\u672c\u4fee\u6b63\u306fPHP 7.4\u4ee5\u964d\u3067\u5c0e\u5165\u3055\u308c\u305f\u6a5f\u80fd\uff08float\u7528\u30d5\u30a3\u30eb\u30bf\u3078\u306e\u6700\u5c0f\u5024\u30fb\u6700\u5927\u5024\u6307\u5b9a\uff09\u306b\u95a2\u9023\u3059\u308b\u30d0\u30b0\u3067\u3042\u308a\uff0cPHP 7.3\u4ee5\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u306f\u5f71\u97ff\u3057\u306a\u3044\u3082\u306e\u3068\u601d\u308f\u308c\u307e\u3059\uff0e\u305f\u3060\u3057\uff0cPHP 7.3\u304a\u3088\u3073\u4ee5\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306f\u3059\u3067\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u95a2\u9023\u306e\u4fee\u6b63\u3082\u542b\u3081\u3066\u30b5\u30dd\u30fc\u30c8\u304c\u7d42\u4e86\u3057\u3066\u3044\u307e\u3059\uff0e\u8a72\u5f53\u3059\u308b\u30b5\u30dd\u30fc\u30c8\u5bfe\u8c61\u5916\u306ePHP\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u30e6\u30fc\u30b6\u306f\u3088\u308a\u65b0\u3057\u3044\u30b5\u30dd\u30fc\u30c8\u4e2d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3078\u306e\u66f4\u65b0\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\uff0e<\/p>\n\n\n\n

\u672c\u4ef6\u306e\u8106\u5f31\u6027\u304c\u95a2\u9023\u3059\u308b\u30b3\u30fc\u30c9\u306e\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3057\u307e\u3059\uff0e<\/p>\n\n\n\n

filter_var($input,FILTER_VALIDATE_FLOAT,\n\u00a0 \u00a0 [\"options\" => ['min_range' => -1, 'max_range' => 1]]);<\/code><\/pre>\n\n\n\n
\u3000filter_var()\u95a2\u6570\u306f\uff0c\u30e6\u30fc\u30b6\u304b\u3089\u5165\u529b\u3055\u308c\u305f\u5909\u6570\u306e\u5185\u5bb9\u3092\u6307\u5b9a\u3057\u305f\u5909\u6570\u306e\u7a2e\u5225\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u305f\u3081\u306e\u3082\u306e\u3067\uff0c\u30e6\u30fc\u30b6\u5165\u529b\u5024\u306e\u78ba\u8a8d\u306e\u305f\u3081\u306b\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\uff0e\u4eca\u56de\u306e\u8106\u5f31\u6027\u306ffloat\u306e\u5224\u5b9a\u3092\u884c\u3046FILTER_VALIDATE_FLOAT\u3092\u6307\u5b9a\u3057\uff0c\u304b\u3064\uff0c\u7bc4\u56f2\u3092\u6307\u5b9a\u3059\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\uff08min_range\uff0cmax_range\uff09\u3092\u6307\u5b9a\u3057\u305f\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\uff0e\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\uff0c-1\uff5e+1\u306e\u7bc4\u56f2\u5185\u306b\u3042\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u304c\uff0c\u3053\u306e\u969b\uff0c\u5909\u6570$input\u306b\u30c1\u30a7\u30c3\u30af\u7bc4\u56f2\u5916\u306e\u5024\uff08\u4f8b\u3048\u3070\u201d+11\u201d\uff09\u304c\u5165\u3063\u3066\u3044\u308b\u3068\uff0c\u68c4\u5374\u51e6\u7406\u306b\u5165\u308a\u307e\u3059\uff0e\u3057\u304b\u3057\uff0c\u3053\u306e\u969b\u306e\u30e1\u30e2\u30ea\u958b\u653e\u306e\u624b\u9806\u306b\u554f\u984c\u304c\u3042\u308a\uff0c\u78ba\u4fdd\u3055\u308c\u305f\u30e1\u30e2\u30ea\u304c\u89e3\u653e\u3055\u308c\u305f\u5f8c\u306b\u5229\u7528\u3055\u308c\u308b\u72b6\u614b\uff08use after free\uff09\u3068\u306a\u308b\u305f\u3081\uff0c\u30ea\u30e2\u30fc\u30c8\u30b3\u30fc\u30c9\u5b9f\u884c\u306a\u3069\u306e\u8106\u5f31\u6027\u304c\u767a\u751f\u3057\u307e\u3059\uff0e<\/p>\n\n\n\n
\u3000\u30e6\u30fc\u30b6\u5165\u529b\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3092\u884c\u3046\u6a5f\u80fd\u3067\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u95a2\u9023\u306e\u8106\u5f31\u6027\u304c\u767a\u751f\u3059\u308b\u306e\u306f\u76ae\u8089\u3067\u3059\u304c\uff0c\u30e1\u30e2\u30ea\u958b\u653e\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5bfe\u7b56\u3068\u3057\u3066\u3082\u91cd\u8981\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3059\u4f8b\u3067\u3042\u308b\u3068\u3044\u3048\u307e\u3059\uff0e<\/p>\n\n\n\n
PHP 8.2\u306e\u958b\u767a\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3068\u4f53\u5236<\/h4>\n\n\n\n
\u3000\u6b21\u306e\u30de\u30a4\u30ca\u30fc\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3042\u308bPHP 8.2\u306f\uff0c\u5f93\u6765\u306e\u30ea\u30ea\u30fc\u30b9\u30b5\u30a4\u30af\u30eb\u306b\u57fa\u3065\u304f\u3068\u3059\u308b\u3068\uff0c\u672c\u5e74\u672b\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u304c\uff0c\u672c\u7a3f\u57f7\u7b46\u6642\u70b9\u3067\u306f\u30ea\u30ea\u30fc\u30b9\u306b\u5411\u3051\u305f\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3084\u30ea\u30ea\u30fc\u30b9\u30de\u30cd\u30fc\u30b8\u30e3\u306e\u9078\u5b9a\u306a\u3069\u306f\u59cb\u307e\u3063\u3066\u304a\u3089\u305a\uff0c\u4ee3\u8868\u7684\u306a\u5909\u66f4\u70b9\u3084\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u7b49\u306e\u8a73\u7d30\u306f\u672a\u78ba\u5b9a\u306e\u72b6\u614b\u3067\u3059\uff0e\u73fe\u6642\u70b9\u3067\u306f\uff0c\u65b0\u3057\u3044\u6a5f\u80fd\u306e\u63d0\u6848\u3084\u8b70\u8ad6\u304c\u884c\u308f\u308c\u3066\u3044\u308b\u72b6\u614b\u3067\u3059\u306e\u3067\uff0c\u304a\u305d\u3089\u304f6\u6708\u9803\u306b\u306f\u30ea\u30ea\u30fc\u30b9\u306b\u5411\u3051\u305f\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u7b49\u304c\u898b\u3048\u3066\u304f\u308b\u3082\u306e\u3068\u601d\u308f\u308c\u307e\u3059\uff0e\u4ee5\u4e0b\uff0cPHP \u306b\u5411\u3051\u3066\u63d0\u6848\u3055\u308c\u3066\u3044\u308b\u6a5f\u80fd\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff0e<\/p>\n\n\n\n
null\u578b\u304a\u3088\u3073false\u578b\u306e\u8ffd\u52a0\uff08https:\/\/wiki.php.net\/rfc\/null-false-standalone-types\uff09<\/h4>\n\n\n\n
\u3000\u672c\u63d0\u6848\u306f\uff0cPHP\u306bnull\u3068false\u3092\u65b0\u305f\u306a\u6a19\u6e96\u578b\u306b\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3092\u63d0\u6848\u3059\u308b\u3082\u306e\u3067\u3059\uff0e\u73fe\u5728\uff0cPHP 8.2\u306b\u5411\u3051\u305f\u8ffd\u52a0\u6a5f\u80fd\u3068\u3057\u3066\u63d0\u6848\u6bb5\u968e\u306b\u3042\u308a\uff0c\u63a1\u5426\u3092\u554f\u3046\u6295\u7968\u304c\u884c\u308f\u308c\u3044\u307e\u3059\u304c\uff0c\u672c\u7a3f\u57f7\u7b46\u6bb5\u968e\u3067\u306f\u8cdb\u621033\uff0c\u53cd\u5bfe0\u3068\u306a\u3063\u3066\u304a\u308a\uff0c\u63a1\u7528\u306e\u8981\u4ef6\u3067\u3042\u308b2\/3\u3092\u4e0a\u56de\u308b\u8cdb\u6210\u591a\u6570\u3067\u63a1\u7528\u3055\u308c\u308b\u898b\u8fbc\u307f\u3067\u3059\uff0e\u4ee5\u4e0b\u63d0\u6848\u5185\u5bb9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\uff0e<\/p>\n\n\n\n
\u3000\u5f93\u6765\u306ePHP\u306b\u304a\u3044\u3066\uff0cnull\u306f\u5358\u4e00\u306e\u5024\u3092\u4fdd\u6301\u3059\u308b\u30e6\u30cb\u30c3\u30c8\u578b\uff0cfalse\u306f\u8ad6\u7406\u5024\u3092\u4fdd\u6301\u3059\u308b\u30ea\u30c6\u30e9\u30eb\u578b\u3068\u3057\u3066\u6271\u308f\u308c\u3066\u3044\u307e\u3059\uff0e\u30e6\u30cb\u30c3\u30c8\u578b\u306f\u60c5\u5831\u3092\u4fdd\u6301\u3067\u304d\u305a\uff0c\u95a2\u6570\u306a\u3069\u306e\u578b\u5ba3\u8a00\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u5236\u7d04\u304c\u3042\u308a\u307e\u3059\uff0e<\/p>\n\n\n\n
\u3000\u6700\u8fd1\u306ePHP\u3067\u306f\uff0c\u578b\u5ba3\u8a00\u3092\u4f7f\u3044\u3084\u3059\u304f\u3059\u308b\u62e1\u5f35\u304c\u884c\u308f\u308c\u3066\u304a\u308a\uff0cPHP 8.0\u3067\u306f\u5171\u7528\u578b\uff08union\uff09\uff0cPHP 8.1\u3067\u306f\u4ea4\u5dee\u578b\uff08intersection\uff09\u304c\u5c0e\u5165\u3055\u308c\u3066\u3044\u307e\u3059\uff0efalse\u306f\uff0c\u5171\u7528\u578b\u306e\u4e2d\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\uff0c\u201dnull | false\u201d\u306e\u3088\u3046\u306b\u7d44\u307f\u5408\u308f\u305b\u3066\u6307\u5b9a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\uff0e<\/p>\n\n\n\n
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