Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\smack\smackfs.c Create Date:2022-07-28 19:28:38
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:smk_write_onlycap - write() for smackfs/onlycap*@file: file pointer, not actually used*@buf: where to get the data from*@count: bytes sent*@ppos: where to start* Returns number of bytes written or error code, as appropriate

Proto:static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, size_t count, loff_t *ppos)

Type:ssize_t

Parameter:

TypeParameterName
struct file *file
const char __user *buf
size_tcount
loff_t *ppos
1984  LIST_HEAD(list_tmp)
1987  If Not smack_privileged - are all privilege requirements met*@cap: The requested capability* Is the task privileged and allowed to be privileged* by the onlycap rule.* Returns true if the task is allowed to be privileged, false if it's not. Then Return -EPERM
1990  data = memdup_user_nul - duplicate memory region from user space and NUL-terminate*@src: source address in user space*@len: number of bytes to copy* Return: an ERR_PTR() on failure.
1991  If IS_ERR(data) Then Return PTR_ERR(data)
1994  rc = smk_parse_label_list - parse list of Smack labels, separated by spaces*@data: the string to parse*@private: destination list* Returns zero on success or error code, as appropriate
1995  kfree(data)
2007  If Not rc || rc == -EINVAL && list_empty - tests whether a list is empty*@head: the list to test. Then
2008  mutex_lock( & smack_onlycap_lock)
2009  smk_list_swap_rcu - swap public list with a private one in RCU-safe way* The caller must hold appropriate mutex to prevent concurrent modifications* to the public list
2010  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.
2011  rc = count
2014  smk_destroy_label_list - destroy a list of smack_known_list_elem*@head: header pointer of the list to destroy
2016  Return rc