发布时间: 2025年1月23日
修改时间: 2025年4月2日
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.
| NVD | openEuler | |
|---|---|---|
| Confidentiality | None | |
| Attack Vector | Local | |
| CVSS评分 | N/A | 5.5 |
| Attack Complexity | Low | |
| Privileges Required | Low | |
| Scope | Unchanged | |
| Integrity | None | |
| User Interaction | None | |
| Availability | High |
| 公告名 | 概要 | 发布时间 |
|---|---|---|
| KylinSec-SA-2025-1288 | 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. | 2025年3月10日 |
| 产品 | 包 | 状态 |
|---|---|---|
| KY3.4-5 | kernel | Unaffected |
| KY3.5.3 | kernel | Unaffected |
| V6 | kernel | Unaffected |
