函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\tomoyo\common.c Create Date:2022-07-27 21:06:34
Last Modify:2020-03-18 09:15:18 Copyright©Brick
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函数名称：moyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.*@head: Pointer to "struct tomoyo_io_buffer".*@buffer: Pointer to buffer to read from.*@buffer_len: Size of @buffer.* Returns @buffer_len on success, negative value otherwise.

函数原型：ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head, const char __user *buffer, const int buffer_len)

返回类型：ssize_t

参数：

类型参数名称
struct tomoyo_io_buffer *head
const char __user *buffer
const intbuffer_len
2658  error等于buffer_len
2659  avail_len等于buffer_len
2660  cp0等于Buffer for writing.
2663  如果非write则返回:负EINVAL
2665  如果非access_ok - Checks if a user space pointer is valid*@addr: User space pointer to start of block to check*@size: Size of block to check* Context: User context only. This function may sleep if pagefaults are* enabled.(buffer, buffer_len)则返回:负EFAULT
2667  如果mutex_lock_interruptible( & Exclusive lock for this structure. )则返回:负EINTR
2669  read_user_buf_avail等于0
2670  idx等于moyo_read_lock - Take lock for protecting policy.* Returns index number for tomoyo_read_unlock().
2672  当avail_len大于0循环
2675  如果 Bytes available for writing. 大于等于Size of write buffer. 减1则
2676  len等于Size of write buffer. 乘2
2677  cp等于分配内存并置零
2679  如果非cp则
2680  error等于负ENOMEM
2681  退出
2683  memmove(cp, cp0, Bytes available for writing. )
2684  释放内存
2685  Buffer for writing. 等于cp
2686  cp0等于cp
2687  Size of write buffer. 等于len
2689  如果Careful: we have to cast the result to the type of the pointer* for sign reasons(c, buffer)则
2690  error等于负EFAULT
2691  退出
2693  buffer自加
2694  avail_len自减
2695  cp0[ Bytes available for writing. ++]等于c
2696  如果c不等于'\n'则继续下一循环
2698  cp0[ Bytes available for writing. - 1]等于'\0'
2699  Bytes available for writing. 等于0
2700  tomoyo_normalize_line(cp0)
2701  如果非字符串比较则
2702  ns等于tomoyo_kernel_namespace
2703  The position currently writing to. = NULL
2704  memset( & r, 0, r的长度)
2705  继续下一循环
2709  当:Type of this interface. 恒等于TOMOYO_PROCESS_STATUS
2711  退出
2712  当:Type of this interface. 恒等于TOMOYO_DOMAINPOLICY
2716  当:Type of this interface. 恒等于TOMOYO_EXCEPTIONPOLICY
2717  如果非字符串比较则
2718  print_transition_related_only = true
2719  继续下一循环
2722  默认
2723  如果非moyo_manager - Check whether the current process is a policy manager.* Returns true if the current process is permitted to modify policy* via /sys/kernel/security/tomoyo/ interface.* Caller holds tomoyo_read_lock().则
2747  out :
2748  moyo_read_unlock - Release lock for protecting policy.*@idx: Index number returned by tomoyo_read_lock().* Returns nothing.
2749  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
2750  返回:error
调用者
名称描述
tomoyo_writemoyo_write - write() for /sys/kernel/security/tomoyo/ interface.*@file: Pointer to "struct file".*@buf: Pointer to buffer.*@count: Size of @buf.*@ppos: Unused.* Returns @count on success, negative value otherwise.