kernel: mm/MADV_COLLAPSE: catch !none !huge !bad pmd lookups

A flaw was found in the Linux kernel MADVCOLLAPSE path. A race with khugepaged can clear a PMD after the collapse code has decided it is a page-table pointer. A local user can trigger a bad PMD lookup and crash the kernel...

Linux Kernel mm: thp: pmd_present和PROT_NONE本地拒绝服务漏洞

BUGTRAQ ID: 58046 CVECAN ID: CVE-2013-0309 Linux Kernel是Linux操作系统的内核。 使用pmdpresent的VM会返回错误的PROTNONE范围值，当使用pmdpresent的代码得到漏报后，内核会崩溃，本地未授权用户可利用此漏洞使系统崩溃。 0 Linux kernel 2.6.x 厂商补丁： Linux ----- 目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：...