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Backporting is the action of taking parts from a newer version of a software system or software component and porting them to an older version of the same software. It forms part of the maintenance step in a software development process, and it is commonly used for fixing security issues in older versions of the software and also for providing new features to older versions. ==Overview== The simplest and probably most common situation of backporting is a fixed security hole in a newer version of a piece of software. Consider this simplified example: * Software v2.0 had a security vulnerability that is fixed by changing the text 'is_unsecured' to 'is_secured'. * The same security hole exists in Software v1.0, from which the codebase for the newer version is derived, but there the text may read 'is_notsecure'. By taking the modification that fixes Software v2.0 and changing it so that it applies to Software v1.0, one has effectively backported the fix.〔(【引用サイトリンク】 Backporting Security Fixes )〕 In real-life situations, the modifications that a single aspect of the software has undergone may be simple (only a few lines of code have changed) up to heavy and massive (many modifications spread across multiple files of the code). In the latter case, backporting may become tedious and inefficient and should only be undergone if the older version of the software is really needed in favour of the newer (if, for example, the newer version still suffers stability problems that prevent its use in mission-critical situations).〔(【引用サイトリンク】 Staying close to upstream projects )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Backporting」の詳細全文を読む スポンサード リンク
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