函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\capability.c Create Date:2022-07-27 10:12:26
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：ptracer_capable - Determine if the ptracer holds CAP_SYS_PTRACE in the namespace*@tsk: The task that may be ptraced*@ns: The user namespace to search for CAP_SYS_PTRACE in* Return true if the task that is ptracing the current task had CAP_SYS_PTRACE

函数原型：bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns)

返回类型：bool

参数：

类型参数名称
struct task_struct *tsk
struct user_namespace *ns
520  ret等于0
523  _read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other
524  cred等于cu_dereference() - fetch RCU-protected pointer for dereferencing*@p: The pointer to read, prior to dereferencing* This is a simple wrapper around rcu_dereference_check().( Tracer's credentials at attach: )
525  如果cred则ret等于security_capable(cred, ns, Allow ptrace() of any process , If capable should audit the security request )
528  _read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()
529  返回:ret恒等于0
调用者
名称描述
ptrace_access_vmAccess another process' address space via ptrace.* Source/target buffer must be kernel space,* Do not walk the page table directly, use get_user_pages
cap_bprm_set_credsap_bprm_set_creds - Set up the proposed credentials for execve().*@bprm: The execution parameters, including the proposed creds* Set up the proposed credentials for a new execution context being* constructed by execve()