函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\keys\keyctl.c Create Date:2022-07-27 19:55:41
Last Modify:2020-03-18 07:59:52 Copyright©Brick
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函数名称：Apply a restriction to a given keyring.* The caller must have Setattr permission to change keyring restrictions.* The requested type name may be a NULL pointer to reject all attempts* to link to the keyring. In this case, _restriction must also be NULL.

函数原型：long keyctl_restrict_keyring(key_serial_t id, const char __user *_type, const char __user *_restriction)

返回类型：long

参数：

类型参数名称
key_serial_tid
const char __user *_type
const char __user *_restriction
1658  char * restriction = NULL
1661  key_ref等于Look up a key ID given us by userspace with a given permissions mask to get* the key it refers to.* Flags can be passed to request that special keyrings be created if referred* to directly, to permit partially constructed keys to be found and to skip
1662  如果是错误则返回:错误
1665  ret等于负EINVAL
1666  如果_type则
1667  如果非_restriction则转到:error
1670  ret等于key_get_type_from_user(type, _type, type的长度)
1671  如果ret小于0则转到:error
1674  restriction等于strndup_user - duplicate an existing string from user space*@s: The string to duplicate*@n: Maximum number of bytes to copy, including the trailing NUL.* Return: newly allocated copy of @s or an ERR_PTR() in case of error
1675  如果是错误则
1676  ret等于错误
1677  转到:error
1679  否则
1680  如果_restriction则转到:error
1684  ret等于keyring_restrict - Look up and apply a restriction to a keyring*@keyring_ref: The keyring to be restricted*@type: The key type that will provide the restriction checker.*@restriction: The restriction options to apply to the keyring
1685  释放内存
1686  error :
1687  key_ref_put(key_ref)
1688  返回:ret
调用者
名称描述
SYSCALL_DEFINE5The key control system call
COMPAT_SYSCALL_DEFINE5The key control system call, 32-bit compatibility version for 64-bit archs