Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\smack\smackfs.c Create Date:2022-07-28 19:28:25
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:smk_write_ambient - write() for /smack/ambient*@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_ambient(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
1814  rc = count
1816  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
1819  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.
1820  If IS_ERR(data) Then Return PTR_ERR(data)
1823  skp = smk_import_entry - import a label, return the list entry*@string: a text string that might be a Smack label*@len: the maximum size, or zero if it is NULL terminated
1824  If IS_ERR(skp) Then
1825  rc = PTR_ERR(skp)
1826  Go to out
1829  mutex_lock( & smack_ambient_lock)
1831  oldambient = smk_known
1832  This is the "ambient" label for network traffic.* If it isn't somehow marked, use this.* It can be reset via smackfs/ambient = skp
1833  smk_unlbl_ambient - initialize the unlabeled domain*@oldambient: previous domain string
1835  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.
1837  out :
1838  kfree(data)
1839  Return rc