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CONFIG_XFS_SUPPORT_ASCII_CI: Support deprecated case-insensitive ascii (ascii-ci=1) format

General informations

The Linux kernel configuration item CONFIG_XFS_SUPPORT_ASCII_CI:

Help text

The ASCII case insensitivity filesystem feature only works correctly on systems that have been coerced into using ISO 8859-1, and it does not work on extended attributes. The kernel has no visibility into the locale settings in userspace, so it corrupts UTF-8 names. Enabling this feature makes XFS vulnerable to mixed case sensitivity attacks. Because of this, the feature is deprecated. All users should upgrade by backing up their files, reformatting, and restoring from the backup.

Administrators and users can detect such a filesystem by running xfs_info against a filesystem mountpoint and checking for a string beginning with "ascii-ci=". If the string "ascii-ci=1" is found, the filesystem is a case-insensitive filesystem. If no such string is found, please upgrade xfsprogs to the latest version and try again.

This option will become default N in September 2025. Support for the feature will be removed entirely in September 2030. Distributors can say N here to withdraw support earlier.

To continue supporting case-insensitivity (ascii-ci=1), say Y. To close off an attack surface, say N.



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