漏洞详情: CVE-2024-35872

漏洞标题
mm/secretmem: fix GUP-fast succeeding on secretmem folios
来源:NVD
Linux kernel 安全漏洞
来源:CNNVD
漏洞描述
In the Linux kernel, the following vulnerability has been resolved: mm/secretmem: fix GUP-fast succeeding on secretmem folios folio_is_secretmem() currently relies on secretmem folios being LRU folios, to save some cycles. However, folios might reside in a folio batch without the LRU flag set, or temporarily have their LRU flag cleared. Consequently, the LRU flag is unreliable for this purpose. In particular, this is the case when secretmem_fault() allocates a fresh page and calls filemap_add_folio()->folio_add_lru(). The folio might be added to the per-cpu folio batch and won't get the LRU flag set until the batch was drained using e.g., lru_add_drain(). Consequently, folio_is_secretmem() might not detect secretmem folios and GUP-fast can succeed in grabbing a secretmem folio, crashing the kernel when we would later try reading/writing to the folio, because the folio has been unmapped from the directmap. Fix it by removing that unreliable check.
来源:NVD
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞。攻击者利用该漏洞导致内核崩溃。
来源:CNNVD
None
来源:神龙机器人
漏洞评分(CVSS)
NVD 暂无评分
来源:NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
来源:神龙机器人, 准确率:N/A
漏洞类别
NVD 暂无漏洞类别信息
来源:NVD
其他
来源:CNNVD
相关链接