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 20:28:50
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Derived from fs/exec.c:flush_old_files.

函数原型：static inline void flush_unauthorized_files(const struct cred *cred, struct files_struct *files)

返回类型：void

参数：

类型参数名称
const struct cred *cred
struct files_struct *files
2454  struct file * file, * devnull = NULL
2456  drop_tty等于0
2459  tty等于get_current_tty()
2460  如果tty则
2461  加自旋锁
2462  如果非链表为空则
2470  file_priv等于list_first_entry - get the first element from a list*@ptr: the list head to take the element from.*@type: the type of the struct this is embedded in.*@member: the name of the list_head within the struct.* Note, that list is expected to be not empty.( & tty_files, structtty_file_private, list)
2472  file等于file
2473  如果Same as path_has_perm, but uses the inode from the file struct. 则drop_tty等于1
2476  自旋锁解锁
2477  tty_kref_put(tty)
2480  如果drop_tty则no_tty()
2484  n等于iterate_fd(files, 0, match_file, cred)
2485  如果非n则返回
2488  devnull等于dentry_open( & selinux_null, O_RDWR, cred)
2489  如果是错误则devnull = NULL
2492  循环
2493  replace_fd(n - 1, devnull, 0)
2494  当n等于iterate_fd(files, n, match_file, cred)不等于0循环
2495  如果devnull则fput(devnull)
调用者
名称描述
selinux_bprm_committing_credsPrepare a process for imminent new credential changes due to exec