函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\selinux\hooks.c Create Date:2022-07-27 20:30:36
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：file_map_prot_check

函数原型：static int file_map_prot_check(struct file *file, unsigned long prot, int shared)

返回类型：int

参数：

类型参数名称
struct file *file
unsigned longprot
intshared
3662  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.()
3663  sid等于get the security ID of a set of credentials
3664  rc等于0
3666  如果default_noexec且prot按位与page can be executed 且非file或IS_PRIVATE(file_inode(file))或非shared且prot按位与page can be written 的值则
3674  rc等于avc_has_perm - Check permissions and perform any appropriate auditing
3677  如果rc则转到:error
3681  如果file则
3683  av等于FILE__READ
3686  如果shared且prot按位与page can be written 则av或等于FILE__WRITE
3689  如果prot按位与page can be executed 则av或等于FILE__EXECUTE
3692  返回:Check whether a task can use an open file descriptor toaccess an inode in a given way. Check access to thedescriptor itself, and then use dentry_has_perm tocheck a particular permission to the file.Access to the descriptor is implicitly granted if it
3695  error :
3696  返回:rc
调用者
名称描述
selinux_mmap_file
selinux_file_mprotect