CVE-2022-49554
Description
In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.
How to fix
- linux linux_kernel4.14.282, 4.19.246, 5.4.197, 5.10.120, 5.15.45, 5.17.13, 5.18.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.14 ≤ v < 4.14.282, 4.15 ≤ v < 4.19.246, 4.20 ≤ v < 5.4.197, 5.5 ≤ v < 5.10.120, 5.11 ≤ v < 5.15.45, 5.16 ≤ v < 5.17.13, 5.18 ≤ v < 5.18.2 | 4.14.282, 4.19.246, 5.4.197, 5.10.120, 5.15.45, 5.17.13, 5.18.2 |
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