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Change History

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

bfs: Reconstruct file type when loading from disk

syzbot is reporting that S_IFMT bits of inode->i_mode can become bogus when
the S_IFMT bits of the 32bits "mode" field loaded from disk are corrupted
or when the 32bits "attributes" field loaded from disk are corrupted.

A documentation says that BFS uses only lower 9 bits of the "mode" field.
But I can't find an explicit explanation that the unused upper 23 bits
(especially, the S_IFMT bits) are initialized with 0.

Therefore, ignore the S_IFMT bits of the "mode" field loaded from disk.
Also, verify that the value of the "attributes" field loaded from disk is
either BFS_VREG or BFS_VDIR (because BFS supports only regular files and
the root directory).

https://git.kernel.org/stable/c/34ab4c75588c07cca12884f2bf6b0347c7a13872

https://git.kernel.org/stable/c/77899444d46162aeb65f229590c26ba266864223

https://git.kernel.org/stable/c/a8cb796e7e2cb7971311ba236922f5e7e1be77e6