smk_write_ambient

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:

Type	Parameter	Name
struct file *	file
const char __user *	buf
size_t	count
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

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