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Change History

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

erofs: fix the out-of-bounds nameoff handling for trailing dirents

Currently we already have boundary-checks for nameoffs, but the trailing
dirents are special since the namelens are calculated with strnlen()
with unchecked nameoffs.

If a crafted EROFS has a trailing dirent with nameoff >= maxsize,
maxsize - nameoff can underflow, causing strnlen() to read past the
directory block.

nameoff0 should also be verified to be a multiple of
`sizeof(struct erofs_dirent)` as well [1].

[1] https://sashiko.dev/#/patchset/20260416063511.3173774-1-hsiangkao%40linux.alibaba.com

https://git.kernel.org/stable/c/1d55445226c75ddd4e78b09b3e7d99109b28c366

https://git.kernel.org/stable/c/222055e6b4063abd2d9e13c3d49bbd1724c50789

https://git.kernel.org/stable/c/48b27a955d22391c7f30169fa7b6b2e1977f1ce4

https://git.kernel.org/stable/c/8ebb951a284b7446e025afc7dc5e9516ef9a7214

https://git.kernel.org/stable/c/d18a3b5d337fa412a38e776e6b4b857a58836575