Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 77ff465799c60294e248000cd22ae8171da3304c before 3674d8a8dadd03a447dd21069d4dacfc3399b63b; affected 77ff465799c60294e248000cd22ae8171da3304c before 645996efc2ae391246d595832aaa6f9d3cc338c7; affected 77ff465799c60294e248000cd22ae8171da3304c before fc658c083904427abbf8f18280d517ee2668677c; affected 77ff465799c60294e248000cd22ae8171da3304c before fae05b2314b147a78fbed1dc4c645d9a66313758; affected 77ff465799c60294e248000cd22ae8171da3304c before 3ec459c8810e658401be428d3168eacfc380bdd0; affected 77ff465799c60294e248000cd22ae8171da3304c before 8ba7b7c1dad1f6503c541778f31b33f7f62eb966; affected 77ff465799c60294e248000cd22ae8171da3304c before c5402fb5f71f1a725f1e55d9c6799c0c7bec308f; affected 77ff465799c60294e248000cd22ae8171da3304c before 2505a981114dcb715f8977b8433f7540854851d8 |
| Linux / Linux | affected 4.14; unaffected 0 before 4.14; unaffected 4.14.282 through 4.14.*; unaffected 4.19.246 through 4.19.*; unaffected 5.4.197 through 5.4.*; unaffected 5.10.120 through 5.10.*; unaffected 5.15.45 through 5.15.*; unaffected 5.17.13 through 5.17.*; unaffected 5.18.2 through 5.18.*; unaffected 5.19 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b
- https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7
- https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c
- https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758
- https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0
- https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966
- https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f
- https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8
ADP enrichment
No English description supplied.
No references supplied.