Time-of-check to time-of-use: Difference between revisions

Revision as of 20:33, 15 March 2025

Revision as of 02:09, 16 March 2025

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{{Short description|Class of software bugs}}

In [[software development]], '''time-of-check to time-of-use''' ('''TOCTOU''', '''TOCTTOU''', or '''TOC/TOU''', or '''Tock Tuah''') is a class of [[software bug]]s caused by a [[race condition]] involving the ''checking'' of the state of a part of a system (such as a security credential) and the ''use'' of the results of that check.

TOCTOU race conditions are common in [[Unix]] between operations on the [[File system#Metadata|file system]],<ref>{{Cite web