Vulnerability CVE-2024-41034
Published: 2024-07-29

Description:
In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix kernel bug on rename operation of broken directory

Syzbot reported that in rename directory operation on broken directory on
nilfs2, __block_write_begin_int() called to prepare block write may fail
BUG_ON check for access exceeding the folio/page size.

This is because nilfs_dotdot(), which gets parent directory reference
entry ("..") of the directory to be moved or renamed, does not check
consistency enough, and may return location exceeding folio/page size for
broken directories.

Fix this issue by checking required directory entries ("." and "..") in
the first chunk of the directory in nilfs_dotdot().

 References:
https://git.kernel.org/stable/c/ff9767ba2cb949701e45e6e4287f8af82986b703
https://git.kernel.org/stable/c/24c1c8566a9b6be51f5347be2ea76e25fc82b11e
https://git.kernel.org/stable/c/a9a466a69b85059b341239766a10efdd3ee68a4b
https://git.kernel.org/stable/c/7000b438dda9d0f41a956fc9bffed92d2eb6be0d
https://git.kernel.org/stable/c/1a8879c0771a68d70ee2e5e66eea34207e8c6231
https://git.kernel.org/stable/c/60f61514374e4a0c3b65b08c6024dd7e26150bfd
https://git.kernel.org/stable/c/298cd810d7fb687c90a14d8f9fd1b8719a7cb8a5
https://git.kernel.org/stable/c/a9e1ddc09ca55746079cc479aa3eb6411f0d99d4
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