Why Linus Torvalds Calls Case‑Insensitive Filesystems a Massive Mistake
Linus Torvalds sharply criticized the case‑insensitive feature in file systems as a huge mistake, warning that it introduces serious security vulnerabilities by allowing mismatched filenames and Unicode characters to be treated as equivalent, undermining user‑space security checks and exposing systems to attacks.
Linus Torvalds, the creator of Linux, posted a lengthy message on the Linux Kernel Mailing List (LKML) sharply criticizing the case‑insensitive feature in file systems.
He called the design “a huge mistake” and warned that it introduces serious security risks.
According to his argument, many user‑space programs verify filenames against security‑sensitive patterns, but a case‑insensitive file system may ignore non‑printable characters, causing filenames that should not match to be incorrectly accepted, rendering security checks ineffective.
He also pointed out that Unicode characters such as “❤” and “❤️” can be treated as identical when certain code points are ignored, potentially leading to misclassification of security‑critical files.
Netizens reacted, asking why the displayed heart symbols differ.
Source: IT Home (https://www.ithome.com/0/849/067.html).
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