{"id":1269,"date":"2026-10-24T15:00:00","date_gmt":"2026-10-24T06:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1269"},"modified":"2026-10-23T00:17:58","modified_gmt":"2026-10-22T15:17:58","slug":"qs-umask-creation-permission-mask-20261022","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1269","title":{"rendered":"umask\u306f\u5f15\u304d\u7b97\u3067\u306f\u306a\u3044\u3001\u65b0\u3057\u3044\u30d5\u30a1\u30a4\u30eb\u306e\u6a29\u9650\u304b\u3089\u6d88\u3059\u30d3\u30c3\u30c8"},"content":{"rendered":"<p>\u540c\u3058\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u3063\u305f\u306e\u306b\u3001\u7aef\u672b\u3067\u5b9f\u884c\u3057\u305f\u3068\u304d\u3068\u30b5\u30fc\u30d3\u30b9\u3068\u3057\u3066\u52d5\u304b\u3057\u305f\u3068\u304d\u3067\u3001\u4ed6\u306e\u5229\u7528\u8005\u304b\u3089\u8aad\u3081\u308b\u7bc4\u56f2\u304c\u9055\u3046\u3002\u3053\u3093\u306a\u5834\u9762\u3067\u306f\u3001\u4f5c\u6210\u6642\u306b\u8981\u6c42\u3057\u305f\u6a29\u9650\u3060\u3051\u3067\u306a\u304f\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u6301\u3064<strong>umask\uff08\u30d5\u30a1\u30a4\u30eb\u4f5c\u6210\u30de\u30b9\u30af\uff09<\/strong>\u3082\u624b\u639b\u304b\u308a\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>umask\u306f\u3001\u8981\u6c42\u3057\u305f\u6a29\u9650\u304b\u3089\u7279\u5b9a\u306e\u30d3\u30c3\u30c8\u3092\u53d6\u308a\u9664\u304f\u4ed5\u7d44\u307f\u3067\u3059\u3002\u300c666\u304b\u3089022\u3092\u5f15\u3051\u3070644\u300d\u3068\u3044\u3046\u899a\u3048\u65b9\u3067\u306f\u3001\u305f\u307e\u305f\u307e\u7b54\u3048\u304c\u5408\u3046\u7d44\u5408\u305b\u3057\u304b\u8aac\u660e\u3067\u304d\u307e\u305b\u3093\u3002Linux man-pages 6.19\u306e\u5b9a\u7fa9\u306b\u6cbf\u3063\u3066\u3001\u4f55\u3092\u53d6\u308a\u9664\u304d\u3001\u4f55\u3092\u8ffd\u52a0\u3057\u306a\u3044\u306e\u304b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\" aria-label=\"\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>\u89aa\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u65e2\u5b9aACL\u304c\u306a\u3044\u5834\u5408\u3001\u65b0\u3057\u304f\u4f5c\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u901a\u5e38\u306e\u6a29\u9650\u30d3\u30c3\u30c8\u306f\u3001\u8981\u6c42\u3057\u305fmode\u304b\u3089umask\u304c\u6307\u5b9a\u3059\u308b\u30d3\u30c3\u30c8\u3092\u6d88\u3057\u3066\u6c7a\u307e\u308a\u307e\u3059\u3002<\/li>\n<li>\u8a08\u7b97\u306f\u5f15\u304d\u7b97\u3067\u306f\u306a\u304f\u30d3\u30c3\u30c8\u5358\u4f4d\u306e\u51e6\u7406\u3067\u3059\u30020666\u30680077\u306a\u30890600\u30010600\u30680077\u3067\u30820600\u3068\u306a\u308a\u3001\u8981\u6c42\u3057\u3066\u3044\u306a\u3044\u6a29\u9650\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<li>\u65e2\u5b9aACL\u304c\u3042\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u306f\u6c7a\u3081\u65b9\u304c\u5909\u308f\u308a\u307e\u3059\u3002umask\u3060\u3051\u3067\u7d50\u679c\u3092\u4e88\u6e2c\u305b\u305a\u3001\u4f5c\u6210\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3001\u8981\u6c42mode\u3001\u89aa\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306eACL\u3092\u5206\u3051\u3066\u8abf\u3079\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u8aad\u307f\u66f8\u304d\u5b9f\u884c\u306e\u4e09\u3064\u3092\u3001\u4e09\u7d44\u306b\u5206\u3051\u308b<\/h2>\n<p>\u901a\u5e38\u306e\u30d5\u30a1\u30a4\u30eb\u6a29\u9650\u306b\u306f\u3001\u6240\u6709\u8005\u30fb\u30b0\u30eb\u30fc\u30d7\u30fb\u305d\u306e\u4ed6\u3068\u3044\u3046\u4e09\u7d44\u304c\u3042\u308a\u3001\u5404\u7d44\u306b\u8aad\u307f\u53d6\u308ar\u3001\u66f8\u304d\u8fbc\u307fw\u3001\u5b9f\u884cx\u306e\u30d3\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002\u516b\u9032\u6570\u3067\u306fr\u304c4\u3001w\u304c2\u3001x\u304c1\u306a\u306e\u3067\u30016\u306f\u8aad\u307f\u66f8\u304d\u30017\u306f\u8aad\u307f\u66f8\u304d\u5b9f\u884c\u30014\u306f\u8aad\u307f\u53d6\u308a\u3060\u3051\u3092\u8868\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u7279\u6b8a\u306a\u6a29\u9650\u30d3\u30c3\u30c8\u3092\u9664\u304d\u3001\u3053\u306e\u4e5d\u3064\u306e\u30d3\u30c3\u30c8\u306b\u6ce8\u76ee\u3057\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070mode\u306e0666\u306f\u3001\u4e09\u7d44\u305d\u308c\u305e\u308c\u306b\u8aad\u307f\u66f8\u304d\u3092\u8981\u6c42\u3057\u3001\u5b9f\u884c\u306f\u8981\u6c42\u3057\u306a\u3044\u6307\u5b9a\u3067\u3059\u3002\u5148\u982d\u306e0\u3092\u542b\u3080\u8868\u8a18\u306f\u516b\u9032\u6570\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u5bfe\u3057\u3066umask\u306e0022\u306f\u3001\u30b0\u30eb\u30fc\u30d7\u3068\u305d\u306e\u4ed6\u306e\u300c\u66f8\u304d\u8fbc\u307f\u300d\u3092\u53d6\u308a\u9664\u304f\u6307\u5b9a\u3067\u3059\u3002\u6570\u5b57\u306e\u6841\u304c\u5bfe\u5fdc\u3057\u3066\u3044\u3066\u3082\u3001umask\u306f\u6700\u7d42\u7684\u306b\u4e0e\u3048\u305f\u3044\u6a29\u9650\u305d\u306e\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u300c\u8981\u6c42\u3059\u308b\u5074\u300d\u3068\u300c\u6d88\u3059\u5074\u300d\u3092\u5225\u306b\u7f6e\u304f\u3068\u3001\u7d50\u679c\u304c\u5206\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u30020666\u304b\u30890022\u306e\u66f8\u304d\u8fbc\u307f\u30d3\u30c3\u30c8\u3092\u6d88\u305b\u30700644\u3001\u3064\u307e\u308a\u6240\u6709\u8005\u306f\u8aad\u307f\u66f8\u304d\u3001\u30b0\u30eb\u30fc\u30d7\u3068\u305d\u306e\u4ed6\u306f\u8aad\u307f\u53d6\u308a\u3060\u3051\u3067\u3059\u3002<\/p>\n<h2>\u5f15\u304d\u7b97\u3068\u4e00\u81f4\u3057\u306a\u3044\u4f8b\u304c\u3001\u5f79\u5272\u3092\u306f\u3063\u304d\u308a\u3055\u305b\u308b<\/h2>\n<p>\u89aa\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u65e2\u5b9aACL\u304c\u306a\u3044\u5834\u5408\u3001\u901a\u5e38\u306e\u6a29\u9650\u30d3\u30c3\u30c8\u306e\u8a08\u7b97\u306f <code>mode &amp; ~umask<\/code> \u3067\u3059\u3002<code>~<\/code>\u306f\u30d3\u30c3\u30c8\u306e\u53cd\u8ee2\u3001<code>&amp;<\/code>\u306f\u4e21\u5074\u30671\u306b\u306a\u3063\u3066\u3044\u308b\u30d3\u30c3\u30c8\u3060\u3051\u3092\u6b8b\u3059\u6f14\u7b97\u3092\u8868\u3057\u307e\u3059\u3002\u4e5d\u30d3\u30c3\u30c8\u306b\u9650\u308c\u3070\u3001umask\u304c1\u306b\u3057\u305f\u7b87\u6240\u3092mode\u304b\u3089\u843d\u3068\u3059\u64cd\u4f5c\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>0666\u30680077\u3092\u4f8b\u306b\u3059\u308b\u3068\u3001umask\u306f\u30b0\u30eb\u30fc\u30d7\u3068\u305d\u306e\u4ed6\u306e\u8aad\u307f\u53d6\u308a\u30fb\u66f8\u304d\u8fbc\u307f\u30fb\u5b9f\u884c\u3092\u3059\u3079\u3066\u843d\u3068\u3057\u307e\u3059\u3002\u8981\u6c42mode\u306b\u5b9f\u884c\u30d3\u30c3\u30c8\u306f\u521d\u3081\u304b\u3089\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u305d\u308c\u3092\u6d88\u305d\u3046\u3068\u3057\u3066\u3082\u4ed6\u306e\u30d3\u30c3\u30c8\u3078\u5f71\u97ff\u306f\u51fa\u307e\u305b\u3093\u3002\u6b8b\u308b\u306e\u306f\u6240\u6709\u8005\u306e\u8aad\u307f\u66f8\u304d\u3060\u3051\u3067\u3001\u7d50\u679c\u306f0600\u3067\u3059\u3002<\/p>\n<p>\u4e00\u65b9\u3001\u516b\u9032\u6570\u3068\u3057\u30660666\u304b\u30890077\u3092\u7b97\u8853\u7684\u306b\u5f15\u304f\u30680567\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u6240\u6709\u8005\u306b\u5b9f\u884c\u30d3\u30c3\u30c8\u3092\u751f\u3058\u3055\u305b\u308b\u306a\u3069\u3001\u8981\u6c42mode\u3068\u306f\u7570\u306a\u308b\u6a29\u9650\u3092\u4f5c\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002umask\u306e\u51e6\u7406\u3067\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u7e70\u308a\u4e0b\u304c\u308a\u306f\u8d77\u3053\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3055\u3089\u306bmode\u304c\u6700\u521d\u304b\u30890600\u306a\u3089\u3001umask\u304c0077\u3067\u3082\u7d50\u679c\u306f0600\u306e\u307e\u307e\u3067\u3059\u3002\u3059\u3067\u306b\u5b58\u5728\u3057\u306a\u3044\u30b0\u30eb\u30fc\u30d7\u3068\u305d\u306e\u4ed6\u306e\u6a29\u9650\u3092\u6d88\u3057\u3066\u3082\u3001\u6240\u6709\u8005\u306e\u6a29\u9650\u306f\u6e1b\u308a\u307e\u305b\u3093\u3002\u9006\u306bumask\u30920000\u306b\u3057\u3066\u3082\u30010600\u304c0666\u3078\u5897\u3048\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002umask\u306f\u8981\u6c42\u306e\u4e0a\u9650\u3092\u72ed\u3081\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304c\u3001\u8981\u6c42\u3057\u3066\u3044\u306a\u3044\u30d3\u30c3\u30c8\u3092\u8db3\u3059\u5f79\u5272\u306f\u6301\u305f\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n<figure><a href=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-umask-creation-permission-mask-20261022-figure-384b38f89b0f.png\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-umask-creation-permission-mask-20261022-figure-384b38f89b0f.png\" alt=\"\u8981\u6c420666\u3068\u30de\u30b9\u30af0077\u306e\u30d3\u30c3\u30c8\u9664\u53bb\u306f0600\u306b\u306a\u308b\u3002\u7b97\u8853\u7684\u306a\u5f15\u304d\u7b97\u306f0567\u3068\u306a\u308a\u4e00\u81f4\u3057\u306a\u3044\u3002\u8981\u6c420600\u306a\u3089\u540c\u30580077\u3067\u30820600\u306e\u307e\u307e\u3002\" style=\"width:100%;height:auto;max-width:1200px\"><\/a><figcaption>\u4e5d\u3064\u306e\u901a\u5e38\u6a29\u9650\u30d3\u30c3\u30c8\u3060\u3051\u3092\u4f7f\u3063\u305f\u8a08\u7b97\u4f8b\u3002\u65e2\u5b9aACL\u304c\u306a\u3044\u5834\u5408\u3092\u5bfe\u8c61\u3068\u3059\u308b\u3002\u72ec\u81ea\u306e\u6574\u6570\u6f14\u7b97\u306b\u3088\u308b\u56f3\u3067\u3001\u7279\u5b9a\u306eLinux\u74b0\u5883\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u305f\u5b9f\u6e2c\u3067\u306f\u306a\u3044\u3002<\/figcaption><\/figure>\n<h2>\u540c\u3058umask\u3067\u3082\u3001\u4f5c\u308a\u624b\u304c\u8981\u6c42\u3059\u308bmode\u3067\u7d50\u679c\u304c\u5909\u308f\u308b<\/h2>\n<p>\u6b21\u306e\u8868\u306f\u3001\u901a\u5e38\u306e\u6a29\u9650\u30d3\u30c3\u30c8\u306b\u5bfe\u3059\u308b\u8a08\u7b97\u4f8b\u3067\u3059\u3002\u3044\u305a\u308c\u3082\u65e2\u5b9aACL\u304c\u306a\u3044\u5834\u5408\u306b\u9650\u308a\u307e\u3059\u3002<\/p>\n<div style=\"overflow-x:auto\">\n<table>\n<thead>\n<tr>\n<th>\u8981\u6c42mode<\/th>\n<th>umask<\/th>\n<th>\u7d50\u679c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0666<\/td>\n<td>0022<\/td>\n<td>0644<\/td>\n<\/tr>\n<tr>\n<td>0666<\/td>\n<td>0027<\/td>\n<td>0640<\/td>\n<\/tr>\n<tr>\n<td>0666<\/td>\n<td>0077<\/td>\n<td>0600<\/td>\n<\/tr>\n<tr>\n<td>0777<\/td>\n<td>0022<\/td>\n<td>0755<\/td>\n<\/tr>\n<tr>\n<td>0600<\/td>\n<td>0022<\/td>\n<td>0600<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>0666\u3092\u8981\u6c42\u3059\u308b\u901a\u5e38\u30d5\u30a1\u30a4\u30eb\u3068\u30010777\u3092\u8981\u6c42\u3059\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u306f\u3001\u540c\u30580022\u3067\u30820644\u30680755\u306b\u5206\u304b\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30d5\u30a1\u30a4\u30eb\u7a2e\u5225\u3092\u898b\u3066umask\u304c\u5b9f\u884c\u30d3\u30c3\u30c8\u3092\u8db3\u3057\u305f\u7d50\u679c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4f5c\u6210\u3092\u8981\u6c42\u3059\u308b\u5074\u304c\u6e21\u3057\u305fmode\u306e\u9055\u3044\u3067\u3059\u3002\u5b9f\u969b\u306b\u3069\u306emode\u3092\u6e21\u3059\u304b\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u6c7a\u3081\u308b\u305f\u3081\u3001\u3059\u3079\u3066\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u5fc5\u305a0666\u3092\u51fa\u767a\u70b9\u306b\u3059\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u9055\u3044\u306f\u539f\u56e0\u3092\u8abf\u3079\u308b\u9806\u5e8f\u306b\u3082\u95a2\u308f\u308a\u307e\u3059\u3002\u7d50\u679c\u304c0600\u3060\u304b\u3089\u3068\u3044\u3063\u3066\u3001\u76f4\u3061\u306b\u300cumask\u304c0077\u3060\u3063\u305f\u300d\u3068\u306f\u65ad\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002\u30d7\u30ed\u30b0\u30e9\u30e0\u304c0600\u3060\u3051\u3092\u8981\u6c42\u3057\u3066\u3044\u308c\u3070\u30010022\u3067\u3082\u540c\u3058\u7d50\u679c\u306b\u306a\u308b\u304b\u3089\u3067\u3059\u3002\u6700\u7d42\u7684\u306a\u6a29\u9650\u304b\u3089\u539f\u56e0\u3092\u9006\u7b97\u3059\u308b\u3068\u304d\u306b\u306f\u3001\u8907\u6570\u306e\u7d44\u5408\u305b\u304c\u540c\u3058\u7d50\u679c\u3092\u4f5c\u308b\u3053\u3068\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h2>\u65e2\u5b9aACL\u304c\u3042\u308b\u3068\u3001\u540c\u3058\u5f0f\u3092\u305d\u306e\u307e\u307e\u4f7f\u3048\u306a\u3044<\/h2>\n<p>ACL\u306f\u3001\u901a\u5e38\u306e\u6240\u6709\u8005\u30fb\u30b0\u30eb\u30fc\u30d7\u30fb\u305d\u306e\u4ed6\u306e\u533a\u5206\u3092\u62e1\u5f35\u3057\u3066\u30a2\u30af\u30bb\u30b9\u3092\u8868\u73fe\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002Linux\u3067\u306f\u89aa\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b<strong>\u65e2\u5b9aACL\uff08default ACL\uff09<\/strong>\u304c\u3042\u308b\u3068\u3001\u65b0\u3057\u3044\u30d5\u30a1\u30a4\u30eb\u306f\u305d\u306eACL\u3092\u7d99\u627f\u3057\u3001umask\u306f\u4f7f\u308f\u308c\u307e\u305b\u3093\u3002\u305d\u306e\u3046\u3048\u3067\u3001\u4f5c\u6210\u6642\u306emode\u306b\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u6a29\u9650\u30d3\u30c3\u30c8\u304c\u53d6\u308a\u9664\u304b\u308c\u307e\u3059\u3002<\/p>\n<p>umask\u306e\u8aac\u660e\u3092\u899a\u3048\u3066\u3082\u3001\u3053\u3053\u3092\u98db\u3070\u3059\u3068\u5171\u6709\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u4e88\u6e2c\u3092\u5916\u3057\u307e\u3059\u3002\u540c\u3058umask\u3067\u540c\u3058\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u306e\u306b\u4fdd\u5b58\u5834\u6240\u306b\u3088\u3063\u3066\u7d50\u679c\u304c\u7570\u306a\u308b\u306a\u3089\u3001\u89aa\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e\u65e2\u5b9aACL\u306f\u78ba\u8a8d\u3059\u308b\u5bfe\u8c61\u3067\u3059\u3002\u65e2\u5b9aACL\u306e\u5b58\u5728\u306f\u300c\u5fc5\u305a\u3088\u308a\u5e83\u3044\u6a29\u9650\u306b\u306a\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u306a\u304f\u3001\u6c7a\u5b9a\u306e\u7d4c\u8def\u304c\u5909\u308f\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306fACL\u306e\u5404\u30a8\u30f3\u30c8\u30ea\u3084\u5b9f\u52b9\u6a29\u9650\u306e\u8a73\u7d30\u307e\u3067\u306f\u6271\u3044\u307e\u305b\u3093\u3002\u8868\u3084\u56f3\u306e\u8a08\u7b97\u3092\u305d\u306e\u307e\u307e\u5f53\u3066\u306f\u3081\u3089\u308c\u308b\u306e\u306f\u3001\u65e2\u5b9aACL\u304c\u306a\u3044\u5834\u5408\u3060\u3068\u3044\u3046\u5883\u754c\u3092\u4fdd\u3064\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002<\/p>\n<h2>\u30d7\u30ed\u30bb\u30b9\u306e\u8a2d\u5b9a\u3068\u3001\u65e2\u5b58\u30d5\u30a1\u30a4\u30eb\u306e\u6a29\u9650\u3092\u5206\u3051\u3066\u8abf\u3079\u308b<\/h2>\n<p>umask\u306f\u547c\u3073\u51fa\u3057\u305f\u30d7\u30ed\u30bb\u30b9\u304c\u6301\u3064\u8a2d\u5b9a\u3067\u3059\u3002Linux\u306e\u4ed5\u69d8\u3067\u306ffork\u3067\u4f5c\u3063\u305f\u5b50\u30d7\u30ed\u30bb\u30b9\u306b\u7d99\u627f\u3055\u308c\u3001execve\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7f6e\u304d\u63db\u3048\u3066\u3082\u7dad\u6301\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u7aef\u672b\u3068\u30b5\u30fc\u30d3\u30b9\u306e\u7d50\u679c\u3092\u6bd4\u3079\u308b\u3068\u304d\u306f\u3001\u5bfe\u8a71\u30b7\u30a7\u30eb\u3067\u898b\u305f\u5024\u3060\u3051\u3067\u7d50\u8ad6\u3092\u51fa\u3055\u305a\u3001\u5b9f\u969b\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u3063\u305f\u30d7\u30ed\u30bb\u30b9\u306e\u6761\u4ef6\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001umask\u3092\u5909\u3048\u3066\u3082\u3001\u3059\u3067\u306b\u3042\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u6a29\u9650\u3092\u4e00\u62ec\u3057\u3066\u5909\u66f4\u3059\u308b\u3053\u3068\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u65b0\u898f\u4f5c\u6210\u6642\u306e\u5236\u9650\u3068\u3001\u65e2\u5b58\u30d5\u30a1\u30a4\u30eb\u306e\u6a29\u9650\u5909\u66f4\u306f\u5225\u306e\u64cd\u4f5c\u3067\u3059\u3002\u300c\u3053\u308c\u304b\u3089\u4f5c\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u521d\u671f\u6a29\u9650\u304c\u9055\u3046\u300d\u306e\u304b\u3001\u300c\u4f5c\u6210\u5f8c\u306b\u5225\u306e\u51e6\u7406\u304c\u5909\u66f4\u3057\u305f\u300d\u306e\u304b\u3092\u5206\u3051\u308b\u3068\u3001\u8abf\u3079\u308b\u5bfe\u8c61\u3092\u7d5e\u308c\u307e\u3059\u3002<\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u5024\u3092\u8abf\u3079\u308b\u5834\u5408\u306b\u3082\u6ce8\u610f\u304c\u3042\u308a\u307e\u3059\u3002<code>umask()<\/code>\u306f\u4ee5\u524d\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u304c\u3001\u540c\u6642\u306b\u65b0\u3057\u3044\u5024\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u53d6\u5f97\u5f8c\u306b\u5143\u3078\u623b\u3059\u4e8c\u56de\u306e\u547c\u3073\u51fa\u3057\u306f\u4e00\u3064\u306e\u4e0d\u53ef\u5206\u306a\u64cd\u4f5c\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u304c\u540c\u6642\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u7af6\u5408\u306e\u539f\u56e0\u306b\u306a\u308a\u307e\u3059\u3002Linux 4.7\u4ee5\u964d\u3067\u306f\u3001<code>\/proc\/pid\/status<\/code>\u306eUmask\u6b04\u3067\u5bfe\u8c61\u30d7\u30ed\u30bb\u30b9\u306e\u5024\u3092\u5909\u66f4\u305b\u305a\u306b\u78ba\u8a8d\u3067\u304d\u308b\u3068\u30de\u30cb\u30e5\u30a2\u30eb\u306b\u8a18\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u7d50\u679c\u304c\u60f3\u5b9a\u3068\u9055\u3046\u3068\u304d\u306f\u3001\u307e\u305a\u300c\u8ab0\u304c\u4f5c\u3063\u305f\u304b\u300d\u300c\u3069\u306emode\u3092\u8981\u6c42\u3057\u305f\u304b\u300d\u300c\u65e2\u5b9aACL\u304c\u3042\u308b\u304b\u300d\u3092\u305d\u308d\u3048\u3001\u305d\u306e\u5f8c\u3067\u4fdd\u5b58\u3055\u308c\u305f\u6a29\u9650\u3068\u6bd4\u8f03\u3057\u307e\u3059\u3002umask\u3092\u5358\u72ec\u306e\u7b54\u3048\u306b\u305b\u305a\u3001\u4f5c\u6210\u6642\u306b\u6a29\u9650\u3092\u6c7a\u3081\u308b\u5165\u529b\u306e\u4e00\u3064\u3068\u3057\u3066\u6271\u3046\u3068\u3001\u540c\u3058\u6570\u5b57\u304c\u9055\u3046\u7d50\u679c\u306b\u306a\u308b\u7406\u7531\u3092\u8aac\u660e\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ul>\n<li><a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/umask.2.html\">Linux man-pages 6.19, umask(2)<\/a>\uff08\u30da\u30fc\u30b8\u65e5\u4ed82026\u5e742\u67088\u65e5\uff09\u3002DESCRIPTION\u306e\u6a29\u9650\u30d3\u30c3\u30c8\u3068\u65e2\u5b9aACL\u3001NOTES\u306e\u7d99\u627f\u30fb\u53d6\u5f97\u6642\u306e\u7af6\u5408\u30fb\/proc\u8868\u793a\u3092\u53c2\u7167\u3002\u56f3\u3068\u8868\u306f\u3053\u306e\u5b9a\u7fa9\u306b\u57fa\u3065\u304f\u72ec\u81ea\u306e\u6574\u6570\u8a08\u7b97\u4f8b\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u540c\u3058\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u3063\u305f\u306e\u306b\u3001\u7aef\u672b\u3067\u5b9f\u884c\u3057\u305f\u3068\u304d\u3068\u30b5\u30fc\u30d3\u30b9\u3068\u3057\u3066\u52d5\u304b\u3057\u305f\u3068\u304d\u3067\u3001\u4ed6\u306e\u5229\u7528\u8005\u304b\u3089\u8aad\u3081\u308b\u7bc4\u56f2\u304c\u9055\u3046\u3002\u3053\u3093\u306a\u5834\u9762\u3067\u306f\u3001\u4f5c\u6210\u6642\u306b\u8981\u6c42\u3057\u305f\u6a29\u9650\u3060\u3051\u3067\u306a\u304f\u3001\u30d7\u30ed\u30bb\u30b9\u304c\u6301\u3064umask\uff08\u30d5\u30a1\u30a4\u30eb\u4f5c\u6210\u30de\u30b9\u30af\uff09\u3082\u624b\u639b [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1267,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[30],"tags":[244],"class_list":["post-1269","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computing","tag-linux"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-umask-creation-permission-mask-20261022-featured-9797bdbdad66.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1269","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1269"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1269\/revisions"}],"predecessor-version":[{"id":1270,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1269\/revisions\/1270"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1267"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1269"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1269"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}