retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS); task_unlock(task); if (retval) goto unlock_creds; write_lock_irq(&tasklist_lock); retval = -EPERM; if (unlikely(task->exit_state)) goto unlock_tasklist; ...
,PTRACE_MODE_ATTACH_REALCREDS); task_unlock(task); if(retval) gotounlock_creds; write_lock_irq(&tasklist_lock); retval=-EPERM; if(unlikely(task->exit_state)) gotounlock_tasklist; if(task->ptrace) gotounlock_tasklist; if(seize) flags...
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301 * SUID, SGID and LSM creds get determined differently 302 * under ptrace. 303 */304retval=-ERESTARTNOINTR;305if(mutex_lock_interruptible(&task->signal->cred_guard_mutex))306gotoout;307308task_lock(task);309retval=__ptrace_may_access(task,PTRACE_MODE_ATTACH);310task_unlock(task);311if...
ptracer_cred 这个概念是由 2016 年的一个补丁ptrace: Capture the ptracer’s creds not PT_PTRACE_CAP引入的, 引入 ptracer_cred 的目的是用于当 tracee 执行 exec 去加载setuid executable时做安全检测 为什么需要这个安全检测呢? exec函数族可以更新进程的镜像, 如果被执行文件的setuid 位置位,则运行这个可执行...
ptrace系统调用提供了一个进程(tracer)可以控制另一个进程(tracee)运行的方法,并且tracer可以监控和修改tracee的内存和寄存器,主要用作实现断点调试和系统调用跟踪。 tracee首先要被attach到tracer上,这里的attach以线程为对象,在多线程场景(这里的多线程场景指的使用clone CLONE_THREADflag创建的线程组)下,每个线程可以分...