1 /* 2 * security/tomoyo/common.c 3 * 4 * Securityfs interface for TOMOYO. 5 * 6 * Copyright (C) 2005-2010 NTT DATA CORPORATION 7 */ 8 9 #include <linux/security.h> 10 #include "common.h" 11 12 /** 13 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface. 14 * 15 * @inode: Pointer to "struct inode". 16 * @file: Pointer to "struct file". 17 * 18 * Returns 0 on success, negative value otherwise. 19 */ 20 static int tomoyo_open(struct inode *inode, struct file *file) 21 { 22 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private) 23 - ((u8 *) NULL); 24 return tomoyo_open_control(key, file); 25 } 26 27 /** 28 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface. 29 * 30 * @inode: Pointer to "struct inode". 31 * @file: Pointer to "struct file". 32 * 33 * Returns 0 on success, negative value otherwise. 34 */ 35 static int tomoyo_release(struct inode *inode, struct file *file) 36 { 37 return tomoyo_close_control(file->private_data); 38 } 39 40 /** 41 * tomoyo_poll - poll() for /sys/kernel/security/tomoyo/ interface. 42 * 43 * @file: Pointer to "struct file". 44 * @wait: Pointer to "poll_table". 45 * 46 * Returns 0 on success, negative value otherwise. 47 */ 48 static unsigned int tomoyo_poll(struct file *file, poll_table *wait) 49 { 50 return tomoyo_poll_control(file, wait); 51 } 52 53 /** 54 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface. 55 * 56 * @file: Pointer to "struct file". 57 * @buf: Pointer to buffer. 58 * @count: Size of @buf. 59 * @ppos: Unused. 60 * 61 * Returns bytes read on success, negative value otherwise. 62 */ 63 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count, 64 loff_t *ppos) 65 { 66 return tomoyo_read_control(file->private_data, buf, count); 67 } 68 69 /** 70 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface. 71 * 72 * @file: Pointer to "struct file". 73 * @buf: Pointer to buffer. 74 * @count: Size of @buf. 75 * @ppos: Unused. 76 * 77 * Returns @count on success, negative value otherwise. 78 */ 79 static ssize_t tomoyo_write(struct file *file, const char __user *buf, 80 size_t count, loff_t *ppos) 81 { 82 return tomoyo_write_control(file->private_data, buf, count); 83 } 84 85 /* 86 * tomoyo_operations is a "struct file_operations" which is used for handling 87 * /sys/kernel/security/tomoyo/ interface. 88 * 89 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR). 90 * See tomoyo_io_buffer for internals. 91 */ 92 static const struct file_operations tomoyo_operations = { 93 .open = tomoyo_open, 94 .release = tomoyo_release, 95 .poll = tomoyo_poll, 96 .read = tomoyo_read, 97 .write = tomoyo_write, 98 .llseek = noop_llseek, 99 }; 100 101 /** 102 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory. 103 * 104 * @name: The name of the interface file. 105 * @mode: The permission of the interface file. 106 * @parent: The parent directory. 107 * @key: Type of interface. 108 * 109 * Returns nothing. 110 */ 111 static void __init tomoyo_create_entry(const char *name, const mode_t mode, 112 struct dentry *parent, const u8 key) 113 { 114 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key, 115 &tomoyo_operations); 116 } 117 118 /** 119 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface. 120 * 121 * Returns 0. 122 */ 123 static int __init tomoyo_initerface_init(void) 124 { 125 struct dentry *tomoyo_dir; 126 127 /* Don't create securityfs entries unless registered. */ 128 if (current_cred()->security != &tomoyo_kernel_domain) 129 return 0; 130 131 tomoyo_dir = securityfs_create_dir("tomoyo", NULL); 132 tomoyo_create_entry("query", 0600, tomoyo_dir, 133 TOMOYO_QUERY); 134 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir, 135 TOMOYO_DOMAINPOLICY); 136 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir, 137 TOMOYO_EXCEPTIONPOLICY); 138 tomoyo_create_entry("audit", 0400, tomoyo_dir, 139 TOMOYO_AUDIT); 140 tomoyo_create_entry("self_domain", 0400, tomoyo_dir, 141 TOMOYO_SELFDOMAIN); 142 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir, 143 TOMOYO_DOMAIN_STATUS); 144 tomoyo_create_entry(".process_status", 0600, tomoyo_dir, 145 TOMOYO_PROCESS_STATUS); 146 tomoyo_create_entry("stat", 0644, tomoyo_dir, 147 TOMOYO_STAT); 148 tomoyo_create_entry("profile", 0600, tomoyo_dir, 149 TOMOYO_PROFILE); 150 tomoyo_create_entry("manager", 0600, tomoyo_dir, 151 TOMOYO_MANAGER); 152 tomoyo_create_entry("version", 0400, tomoyo_dir, 153 TOMOYO_VERSION); 154 return 0; 155 } 156 157 fs_initcall(tomoyo_initerface_init); 158