Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: Revert "readahead: properly shorten readahead when falling back to do_page_cache_ra()" This reverts commit 7c877586da3178974a8a94577b6045a48377ff25. Anders and Philippe have reported that recent kernels occasionally hang when used with NFS in readahead code. The problem has been bisected to 7c877586da3 ("readahead: properly shorten readahead when falling back to do_page_cache_ra()"). The cause of the problem is that ra->size can be shrunk by read_pages() call and subsequently we end up calling do_page_cache_ra() with negative (read huge positive) number of pages. Let's revert 7c877586da3 for now until we can find a proper way how the logic in read_pages() and page_cache_ra_order() can coexist. This can lead to reduced readahead throughput due to readahead window confusion but that's better than outright hangs.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7c877586da3178974a8a94577b6045a48377ff25 before 85351e4941a253e4c50fb7048bfc19b60b4ec44b; affected 7c877586da3178974a8a94577b6045a48377ff25 before a220d6b95b1ae12c7626283d7609f0a1438e6437 |
| Linux / Linux | affected 6.11; unaffected 0 before 6.11; unaffected 6.12.5 through 6.12.*; unaffected 6.13 through * |
CWE
No CWE identifiers supplied.