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In a discussion over a proposed patch, "ext4: replace strcpy() with '.' assignment"[1], I had asserted that directory entries in ext4 were not NUL terminated, and hence it was safe to replace strcpy() with a direct assignment. As it turns out, this was incorrect. It's true for all all directory entries *except* for '.' and '..' where the kernel was using strcmp() and where e2fsck actually checks and offers to fix things if '.' and '..' are not NUL terminated. [1] https://lore.kernel.org/r/202505191316.JJMnPobO-lkp@intel.com We can't change this without breaking old kernel versions, but in the spirit of "be liberal in what you receive", use direct comparison of de->name_len and de->name[0,1] instead of strcmp(). This has the side benefit of reducing the compiled text size by 96 bytes on x86_64. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Link: https://patch.msgid.link/20250712181249.434530-1-tytso@mit.edu Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.