函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\yama\yama_lsm.c Create Date:2022-07-27 21:49:14
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：yama_task_prctl - check for Yama-specific prctl operations*@option: operation*@arg2: argument*@arg3: argument*@arg4: argument*@arg5: argument* Return 0 on success, -ve on error. -ENOSYS is returned when Yama* does not handle the given option.

函数原型：static int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3, unsigned long arg4, unsigned long arg5)

返回类型：int

参数：

类型参数名称
intoption
unsigned longarg2
unsigned longarg3
unsigned longarg4
unsigned longarg5
224  rc等于负ENOSYS
225  myself等于当前进程
228  当:option恒等于Set specific pid that is allowed to ptrace the current task.* A value of 0 mean "no process".
235  _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
236  如果非thread_group_leader(myself)则myself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().(线程组主管)
238  get_task_struct(myself)
239  _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()
241  如果arg2恒等于0则
242  yama_ptracer_del - remove exceptions related to the given tasks*@tracer: remove any relation where tracer task matches*@tracee: remove any relation where tracee task matches
243  rc等于0
244  否则如果arg2恒等于PR_SET_PTRACER_ANY或arg2恒等于负1则
245  rc等于yama_ptracer_add - add/replace an exception for this tracer/tracee pair*@tracer: the task_struct of the process doing the ptrace*@tracee: the task_struct of the process to be ptraced* Each tracee can have, at most, one tracer registered. Each time this
246  否则
249  tracer等于find_get_task_by_vpid(arg2)
250  如果非tracer则
251  rc等于负EINVAL
252  否则
258  put_task_struct(myself)
259  退出
262  返回:rc