cap_ptrace_access

函数名称：ap_ptrace_access_check - Determine whether the current process may access* another*@child: The process to be accessed*@mode: The mode of attachment.* If we are in the same or an ancestor user_ns and have all the target

函数原型：int cap_ptrace_access_check(struct task_struct *child, unsigned int mode)

返回类型：int

参数：

类型	参数	名称
struct task_struct *	child
unsigned int	mode

135

ret等于0

139

_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

140

cred等于current_cred - Access the current task's subjective credentials* Access the subjective credentials of the current task. RCU-safe,* since nobody else can modify it.()

141

child_cred等于__task_cred - Access a task's objective credentials*@task: The task to query* Access the objective credentials of a task. The caller must hold the RCU* readlock.* The result of this function should not be passed directly to get_cred();(child)

142

如果mode按位与PTRACE_MODE_FSCREDS则caller_caps等于 caps we can actually use

144

否则caller_caps等于 caps we're permitted

146

如果 user_ns the caps and keyrings are relative to. 恒等于 user_ns the caps and keyrings are relative to. 且Check if "a" is a subset of "set".* return true if ALL of the capabilities in "a" are also in "set"* cap_issubset(0101, 1111) will return true* return false if ANY of the capabilities in "a" are not in "set"* cap_issubset(1111, 0101) will return false则转到:out

149

如果ns_capable( user_ns the caps and keyrings are relative to. , Allow ptrace() of any process )则转到:out

151

ret等于负EPERM

152

out :

153

_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()

154

返回:ret

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