函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\integrity\evm\evm_crypto.c Create Date:2022-07-27 22:09:27
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Get the key from the TPM for the SHA1-HMAC

函数原型：int evm_init_key(void)

返回类型：int

参数：无

359  evm_key等于quest_key - Request a key and wait for construction*@type: Type of key.*@description: The searchable description of the key.*@callout_info: The data to pass to the instantiation upcall (or NULL).
360  如果是错误则返回:负ENOENT
363  lock for reading
364  ekp等于data[0]
366  rc等于vm_set_key() - set EVM HMAC key from the kernel*@key: pointer to a buffer with the key data*@size: length of the key data* This function allows setting the EVM HMAC key from the kernel* without using the "encrypted" key subsystem keys
369  memset( decrypted data , 0, decrypted data length )
370  lease a read lock
371  key_put - Discard a reference to a key.*@key: The key to discard a reference from.* Discard a reference to a key, and when all the references are gone, we* schedule the cleanup task to come and pull it out of the tree in process
372  返回:rc
调用者
名称描述
evm_write_keyvm_write_key - write() for /evm*@file: file pointer, not actually used*@buf: where to get the data from*@count: bytes sent*@ppos: where to start* Used to signal that key is on the kernel key ring