0x00简介. 在5.1.17之前的Linux内核中,kernel / ptrace.c中的ptrace_link错误地处理了想要创建ptrace关系的进程的凭据记录,这允许本地用户通过利用父子的某些方案来获取root访问权限 进程关系,父进程删除权限并调用execve可能允许攻击者控制。 0x01漏洞概述. Linux执行PTRACE_TRACEME函数时,ptrace_link函数将获得对父进程凭据的RCU引用,然后将该指针指向get_cred函数,但是,对象struct cred的生存周期规则不允许无条件的将RCU引用转换为稳定引用。PTRACE_TRACEME获取父进程的凭证,使其能够像….

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