{"id":1317,"date":"2026-10-25T03:00:00","date_gmt":"2026-10-24T18:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1317"},"modified":"2026-10-23T03:23:34","modified_gmt":"2026-10-22T18:23:34","slug":"qs-memfd-seals-content-size-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1317","title":{"rendered":"memfd\u306e\u30b7\u30fc\u30eb\u3001\u5185\u5bb9\u306e\u56fa\u5b9a\u3068\u30b5\u30a4\u30ba\u306e\u56fa\u5b9a\u3092\u5206\u3051\u3066\u8003\u3048\u308b"},"content":{"rendered":"<p>\u5171\u6709\u3059\u308b\u30c7\u30fc\u30bf\u3092\u300c\u78ba\u5b9a\u3057\u305f\u306e\u3067\u3001\u3082\u3046\u5909\u3048\u3089\u308c\u306a\u3044\u72b6\u614b\u300d\u306b\u3057\u305f\u3044\u3002\u305f\u3060\u3057\u3001\u5185\u5bb9\u306e\u66f8\u304d\u63db\u3048\u3092\u6b62\u3081\u308b\u3053\u3068\u3068\u3001\u5165\u308c\u7269\u306e\u5927\u304d\u3055\u3092\u5909\u3048\u3089\u308c\u306a\u304f\u3059\u308b\u3053\u3068\u306f\u540c\u3058\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Linux\u306ememfd\u3067\u5229\u7528\u3067\u304d\u308b<strong>\u30d5\u30a1\u30a4\u30eb\u30b7\u30fc\u30eb<\/strong>\u306f\u3001\u5909\u66f4\u306e\u7a2e\u985e\u3054\u3068\u306b\u5236\u7d04\u3092\u52a0\u3048\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306fmemfd_create\u3068fcntl\u306e\u30b7\u30fc\u30eb\u64cd\u4f5c\u3092\u5bfe\u8c61\u306b\u3001\u5185\u5bb9\u3001\u7e2e\u5c0f\u3001\u62e1\u5927\u3001\u30b7\u30fc\u30eb\u306e\u8ffd\u52a0\u3068\u3044\u3046\u56db\u3064\u306e\u9055\u3044\u3092\u6574\u7406\u3057\u307e\u3059\u3002\u540d\u524d\u304b\u3089\u300c\u5168\u3066\u56fa\u5b9a\u3055\u308c\u305f\u300d\u3068\u5224\u65ad\u305b\u305a\u3001\u4f55\u304c\u7981\u6b62\u3055\u308c\u3001\u4f55\u304c\u6b8b\u308b\u304b\u3092\u8aad\u307f\u53d6\u308b\u305f\u3081\u306e\u8aac\u660e\u3067\u3059\u3002<\/p>\n<section 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href=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-memfd-seals-content-size-20261023-figure-e600317adab2.png\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-memfd-seals-content-size-20261023-figure-e600317adab2.png\" alt=\"WRITE\u306e\u307f\u3067\u306f\u5185\u5bb9\u5909\u66f4\u3092\u7981\u6b62\u3057\u30b5\u30a4\u30ba\u5909\u66f4\u306f\u5236\u9650\u3057\u306a\u3044\u3002SHRINK\u3068GROW\u3067\u306f\u30b5\u30a4\u30ba\u5909\u66f4\u3092\u7981\u6b62\u3057\u3001\u4e09\u3064\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u5185\u5bb9\u3068\u30b5\u30a4\u30ba\u306e\u4e21\u65b9\u3092\u5236\u9650\u3059\u308b\u3002\" style=\"width:100%;height:auto;max-width:1080px\" 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088\u3046\u306a\u30de\u30c3\u30d4\u30f3\u30b0\u3092\u89e3\u9664\u3057\u3066\u304b\u3089\u8ffd\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30b7\u30fc\u30eb\u3092\u8981\u6c42\u3057\u305f\u3068\u3044\u3046\u30ed\u30b0\u3060\u3051\u3067\u306f\u3001\u5185\u5bb9\u306e\u56fa\u5b9a\u3092\u78ba\u8a8d\u3057\u305f\u3053\u3068\u306b\u306a\u308a\u307e\u305b\u3093\u3002\u623b\u308a\u5024\u3068\u5b9f\u969b\u306e\u30b7\u30fc\u30eb\u96c6\u5408\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002[2]<\/p>\n<p>Linux 5.1\u3067\u5c0e\u5165\u3055\u308c\u305fF_SEAL_FUTURE_WRITE\u306f\u3001\u65e2\u306b\u5b58\u5728\u3059\u308b\u5171\u6709\u30fb\u66f8\u8fbc\u307f\u53ef\u80fd\u306a\u30de\u30c3\u30d4\u30f3\u30b0\u3092\u901a\u3057\u305f\u5185\u5bb9\u5909\u66f4\u3092\u6b8b\u305b\u308b\u70b9\u304c\u9055\u3044\u307e\u3059\u3002\u65b0\u3057\u3044\u5171\u6709\u30fb\u66f8\u8fbc\u307f\u53ef\u80fd\u306a\u30de\u30c3\u30d4\u30f3\u30b0\u3084write\u306b\u3088\u308b\u66f8\u8fbc\u307f\u306f\u5236\u9650\u3057\u307e\u3059\u304c\u3001\u8a2d\u5b9a\u524d\u304b\u3089\u6301\u3063\u3066\u3044\u305f\u7d4c\u8def\u306f\u6b8b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u3001\u4f5c\u6210\u5074\u304c\u66f4\u65b0\u3092\u7d9a\u3051\u3001\u4ed6\u306e\u51e6\u7406\u306b\u306f\u8aad\u53d6\u308a\u7528\u3068\u3057\u3066\u5171\u6709\u3057\u305f\u3044\u8a2d\u8a08\u3067\u5f79\u7acb\u3061\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u53d7\u3051\u624b\u304c\u5185\u5bb9\u3092\u78ba\u8a8d\u3057\u305f\u76f4\u5f8c\u304b\u3089\u6c38\u9060\u306b\u540c\u3058\u5024\u3067\u3042\u308b\u3001\u3068\u63a8\u8ad6\u3059\u308b\u6839\u62e0\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u66f4\u65b0\u3059\u308b\u4e3b\u4f53\u3092\u6b8b\u3059\u306e\u304b\u3001\u5168\u3066\u306e\u5185\u5bb9\u5909\u66f4\u3092\u6b62\u3081\u308b\u306e\u304b\u3092\u3001\u30b7\u30fc\u30eb\u306e\u9078\u629e\u3068\u5bfe\u5fdc\u3055\u305b\u307e\u3059\u3002\u672c\u7a3f\u306e\u56f3\u306fF_SEAL_WRITE\u306e\u6bd4\u8f03\u3067\u3042\u308a\u3001FUTURE_WRITE\u3078\u305d\u306e\u307e\u307e\u7f6e\u304d\u63db\u3048\u305f\u8868\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u53d7\u3051\u53d6\u3063\u305f\u5074\u3082\u3001\u5b9f\u969b\u306e\u5236\u7d04\u3092\u8aad\u3080<\/h2>\n<p>F_GET_SEALS\u306f\u73fe\u5728\u306e\u30b7\u30fc\u30eb\u96c6\u5408\u3092\u30d3\u30c3\u30c8\u30de\u30b9\u30af\u3067\u8fd4\u3057\u307e\u3059\u3002\u53d7\u3051\u624b\u306f\u3001\u5fc5\u8981\u306a\u5236\u7d04\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u4f5c\u6210\u5074\u304c\u300c\u78ba\u5b9a\u6e08\u307f\u300d\u3068\u8aac\u660e\u3057\u305f\u3053\u3068\u3068\u3001\u5fc5\u8981\u306a\u30b7\u30fc\u30eb\u304c\u4ed8\u3044\u305f\u3053\u3068\u306f\u5225\u306e\u89b3\u6e2c\u3067\u3059\u3002\u30b7\u30fc\u30eb\u3092\u6271\u3048\u306a\u3044\u5bfe\u8c61\u3084\u64cd\u4f5c\u5931\u6557\u306e\u5834\u5408\u3082\u3042\u308b\u305f\u3081\u3001\u623b\u308a\u5024\u3068errno\u3092\u5206\u3051\u3066\u8a18\u9332\u3057\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u5185\u5bb9\u3068\u30b5\u30a4\u30ba\u306e\u4e21\u65b9\u304c\u56fa\u5b9a\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u524d\u63d0\u306b\u3059\u308b\u8aad\u307f\u624b\u306a\u3089\u3001WRITE\u3001SHRINK\u3001GROW\u3092\u305d\u308c\u305e\u308c\u70b9\u691c\u3057\u307e\u3059\u3002\u3055\u3089\u306b\u5236\u7d04\u96c6\u5408\u3092\u5909\u3048\u3089\u308c\u306a\u3044\u3053\u3068\u307e\u3067\u5fc5\u8981\u304b\u306f\u3001\u5225\u306e\u8a2d\u8a08\u5224\u65ad\u306b\u306a\u308a\u307e\u3059\u3002\u5358\u4e00\u306e\u771f\u507d\u5024\u3068\u3057\u3066\u300csealed\u300d\u3068\u8a18\u9332\u3059\u308b\u3060\u3051\u3067\u306f\u3001\u3053\u306e\u9055\u3044\u304c\u6d88\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<p>\u672c\u7a3f\u306fLinux man-pages 6.19\u306e\u8a18\u8ff0\u304b\u3089\u5236\u7d04\u306e\u7d44\u5408\u305b\u3092\u6574\u7406\u3057\u305f\u3082\u306e\u3067\u3001Linux\u30ab\u30fc\u30cd\u30eb\u4e0a\u3067\u5404\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u5b9f\u884c\u3057\u305f\u8a66\u9a13\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u6c38\u7d9a\u5316\u3001\u6697\u53f7\u5316\u3001\u30a2\u30af\u30bb\u30b9\u6a29\u306e\u4ed8\u4e0e\u3001\u51e6\u7406\u540c\u58eb\u306e\u540c\u671f\u307e\u3067\u30b7\u30fc\u30eb\u3060\u3051\u3067\u4fdd\u8a3c\u3059\u308b\u8aac\u660e\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u5185\u5bb9\u3001\u30b5\u30a4\u30ba\u3001\u5909\u66f4\u3067\u304d\u308b\u7d4c\u8def\u3001\u5b9f\u969b\u306e\u8a2d\u5b9a\u7d50\u679c\u3092\u5206\u3051\u3066\u8ffd\u3046\u3053\u3068\u304c\u3001\u5171\u6709\u30c7\u30fc\u30bf\u306e\u524d\u63d0\u3092\u6b63\u78ba\u306b\u4fdd\u3064\u51fa\u767a\u70b9\u3067\u3059\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ol>\n<li>Linux man-pages 6.19\u3001<a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/memfd_create.2.html\">memfd_create(2)<\/a>\u3001DESCRIPTION\u3068NOTES\u306eFile sealing\u3002<\/li>\n<li>\u540c\u3001<a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/F_ADD_SEALS.2const.html\">F_GET_SEALS \/ F_ADD_SEALS<\/a>\u3001\u5404\u30b7\u30fc\u30eb\u306e\u8aac\u660e\u3068ERRORS\u3002\u56f3\u306f\u6307\u5b9a\u3057\u305f\u64cd\u4f5c\u306b\u5bfe\u3059\u308b\u72ec\u81ea\u306e\u5236\u7d04\u6574\u7406\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5171\u6709\u3059\u308b\u30c7\u30fc\u30bf\u3092\u300c\u78ba\u5b9a\u3057\u305f\u306e\u3067\u3001\u3082\u3046\u5909\u3048\u3089\u308c\u306a\u3044\u72b6\u614b\u300d\u306b\u3057\u305f\u3044\u3002\u305f\u3060\u3057\u3001\u5185\u5bb9\u306e\u66f8\u304d\u63db\u3048\u3092\u6b62\u3081\u308b\u3053\u3068\u3068\u3001\u5165\u308c\u7269\u306e\u5927\u304d\u3055\u3092\u5909\u3048\u3089\u308c\u306a\u304f\u3059\u308b\u3053\u3068\u306f\u540c\u3058\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Linux\u306ememfd\u3067\u5229\u7528\u3067\u304d\u308b\u30d5\u30a1\u30a4\u30eb\u30b7\u30fc\u30eb\u306f\u3001\u5909\u66f4\u306e\u7a2e [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1315,"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-1317","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-memfd-seals-content-size-20261023-featured-9bb02e5b7230.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1317","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=1317"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1317\/revisions"}],"predecessor-version":[{"id":1318,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1317\/revisions\/1318"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1315"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1317"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1317"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1317"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}