CVE-2024-46744
Squashfs: sanity check symbolic link size
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Squashfs: sanity check symbolic link size
In the Linux kernel, the following vulnerability has been resolved: Squashfs: sanity check symbolic link size Syzkiller reports a "KMSAN: uninit-value in pick_link" bug. This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk. The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events: 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size. 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number. 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page. This patch adds a sanity check which checks that the symbolic link size is not larger than expected. -- V2: fix spelling mistake.
Reserved 2024-09-11 | Published 2024-09-18 | Updated 2024-11-05 | Assigner Linuxgit.kernel.org/...c/f82cb7f24032ed023fc67d26ea9bf322d8431a90
git.kernel.org/...c/1b9451ba6f21478a75288ea3e3fca4be35e2a438
git.kernel.org/...c/5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4
git.kernel.org/...c/087f25b2d36adae19951114ffcbb7106ed405ebb
git.kernel.org/...c/fac5e82ab1334fc8ed6ff7183702df634bd1d93d
git.kernel.org/...c/c3af7e460a526007e4bed1ce3623274a1a6afe5e
git.kernel.org/...c/ef4e249971eb77ec33d74c5c3de1e2576faf6c90
git.kernel.org/...c/810ee43d9cd245d138a2733d87a24858a23f577d
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