/* * Copyright (C) 2010 IBM Corporation * * Authors: * Mimi Zohar * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2 of the License. * * File: evm_secfs.c * - Used to signal when key is on keyring * - Get the key and enable EVM */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include "evm.h" static struct dentry *evm_init_tpm; /** * evm_read_key - read() for /evm * * @filp: file pointer, not actually used * @buf: where to put the result * @count: maximum to send along * @ppos: where to start * * Returns number of bytes read or error code, as appropriate */ static ssize_t evm_read_key(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char temp[80]; ssize_t rc; if (*ppos != 0) return 0; sprintf(temp, "%d", evm_initialized); rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); return rc; } /** * evm_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. * - get the integrity hmac key from the kernel key ring * - create list of hmac protected extended attributes * Returns number of bytes written or error code, as appropriate */ static ssize_t evm_write_key(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char temp[80]; int i; if (!capable(CAP_SYS_ADMIN) || (evm_initialized & EVM_INIT_HMAC)) return -EPERM; if (count >= sizeof(temp) || count == 0) return -EINVAL; if (copy_from_user(temp, buf, count) != 0) return -EFAULT; temp[count] = '\0'; if ((sscanf(temp, "%d", &i) != 1) || (i != 1)) return -EINVAL; evm_init_key(); return count; } static const struct file_operations evm_key_ops = { .read = evm_read_key, .write = evm_write_key, }; int __init evm_init_secfs(void) { int error = 0; evm_init_tpm = securityfs_create_file("evm", S_IRUSR | S_IRGRP, NULL, NULL, &evm_key_ops); if (!evm_init_tpm || IS_ERR(evm_init_tpm)) error = -EFAULT; return error; } g msg

path: root/include/sound/cs8427.h

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