/* Updated: Karl MacMillan <kmacmillan@tresys.com> * * Added conditional policy language extensions * * Copyright (C) 2003 - 2004 Tresys Technology, LLC * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> * 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. */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/string.h> #include <linux/security.h> #include <linux/major.h> #include <linux/seq_file.h> #include <linux/percpu.h> #include <asm/uaccess.h> #include <asm/semaphore.h> /* selinuxfs pseudo filesystem for exporting the security policy API. Based on the proc code and the fs/nfsd/nfsctl.c code. */ #include "flask.h" #include "avc.h" #include "avc_ss.h" #include "security.h" #include "objsec.h" #include "conditional.h" unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; static int __init checkreqprot_setup(char *str) { selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; return 1; } __setup("checkreqprot=", checkreqprot_setup); static DECLARE_MUTEX(sel_sem); /* global data for booleans */ static struct dentry *bool_dir = NULL; static int bool_num = 0; static int *bool_pending_values = NULL; extern void selnl_notify_setenforce(int val); /* Check whether a task is allowed to use a security operation. */ static int task_has_security(struct task_struct *tsk, u32 perms) { struct task_security_struct *tsec; tsec = tsk->security; if (!tsec) return -EACCES; return avc_has_perm(tsec->sid, SECINITSID_SECURITY, SECCLASS_SECURITY, perms, NULL); } enum sel_inos { SEL_ROOT_INO = 2, SEL_LOAD, /* load policy */ SEL_ENFORCE, /* get or set enforcing status */ SEL_CONTEXT, /* validate context */ SEL_ACCESS, /* compute access decision */ SEL_CREATE, /* compute create labeling decision */ SEL_RELABEL, /* compute relabeling decision */ SEL_USER, /* compute reachable user contexts */ SEL_POLICYVERS, /* return policy version for this kernel */ SEL_COMMIT_BOOLS, /* commit new boolean values */ SEL_MLS, /* return if MLS policy is enabled */ SEL_DISABLE, /* disable SELinux until next reboot */ SEL_AVC, /* AVC management directory */ SEL_MEMBER, /* compute polyinstantiation membership decision */ SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ }; #define TMPBUFLEN 12 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } #ifdef CONFIG_SECURITY_SELINUX_DEVELOP static ssize_t sel_write_enforce(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { char *page; ssize_t length; int new_value; if (count < 0 || count >= PAGE_SIZE) return -ENOMEM; if (*ppos != 0) { /* No partial writes. */ return -EINVAL; } page = (char*)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; length = -EINVAL; if (sscanf(page, "%d", &new_value) != 1) goto out; if (new_value != selinux_enforcing) { length = task_has_security(current, SECURITY__SETENFORCE); if (length) goto out; selinux_enforcing = new_value; if (selinux_enforcing) avc_ss_reset(0); selnl_notify_setenforce(selinux_enforcing); } length = count; out: free_page((unsigned long) page); return length; } #else #define sel_write_enforce NULL #endif static struct file_operations sel_enforce_ops = { .read = sel_read_enforce, .write = sel_write_enforce, }; #ifdef CONFIG_SECURITY_SELINUX_DISABLE static ssize_t sel_write_disable(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { char *page; ssize_t length; int new_value; extern int selinux_disable(void); if (count < 0 || count >= PAGE_SIZE) return -ENOMEM; if (*ppos != 0) { /* No partial writes. */ return -EINVAL; } page = (char*)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; length = -EINVAL; if (sscanf(page, "%d", &new_value) != 1) goto out; if (new_value) { length = selinux_disable(); if (length < 0) goto out; } length = count; out: free_page((unsigned long) page); return length; } #else #define sel_write_disable NULL #endif static struct file_operations sel_disable_ops = { .write = sel_write_disable, }; static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static struct file_operations sel_policyvers_ops = { .read = sel_read_policyvers, }; /* declaration for sel_write_load */ static int sel_make_bools(void); static ssize_t sel_read_mls(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static struct file_operations sel_mls_ops = { .read = sel_read_mls, }; static ssize_t sel_write_load(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { int ret; ssize_t length; void *data = NULL; down(&sel_sem); length = task_has_security(current, SECURITY__LOAD_POLICY); if (length) goto out; if (*ppos != 0) { /* No partial writes. */ length = -EINVAL; goto out; } if ((count < 0) || (count > 64 * 1024 * 1024) || (data = vmalloc(count)) == NULL) { length = -ENOMEM; goto out; } length = -EFAULT; if (copy_from_user(data, buf, count) != 0) goto out; length = security_load_policy(data, count); if (length) goto out; ret = sel_make_bools(); if (ret) length = ret; else length = count; out: up(&sel_sem); vfree(data); return length; } static struct file_operations sel_load_ops = { .write = sel_write_load, }; static ssize_t sel_write_context(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { char *page; u32 sid; ssize_t length; length = task_has_security(current, SECURITY__CHECK_CONTEXT); if (length) return length; if (count < 0 || count >= PAGE_SIZE) return -ENOMEM; if (*ppos != 0) { /* No partial writes. */ return -EINVAL; } page = (char*)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; length = security_context_to_sid(page, count, &sid); if (length < 0) goto out; length = count; out: free_page((unsigned long) page); return length; } static struct file_operations sel_context_ops = { .write = sel_write_context, }; static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { char *page; ssize_t length; unsigned int new_value; length = task_has_security(current, SECURITY__SETCHECKREQPROT); if (length) return length; if (count < 0 || count >= PAGE_SIZE) return -ENOMEM; if (*ppos != 0) { /* No partial writes. */ return -EINVAL; } page = (char*)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; length = -EINVAL; if (sscanf(page, "%u", &new_value) != 1) goto out; selinux_checkreqprot = new_value ? 1 : 0; length = count; out: free_page((unsigned long) page); return length; } static struct file_operations sel_checkreqprot_ops = { .read = sel_read_checkreqprot, .write = sel_write_checkreqprot, }; /* * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c */ static ssize_t sel_write_access(struct file * file, char *buf, size_t size); static ssize_t sel_write_create(struct file * file, char *buf, size_t size); static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); static ssize_t sel_write_user(struct file * file, char *buf, size_t size); static ssize_t sel_write_member(struct file * file, char *buf, size_t size); static ssize_t (*write_op[])(struct file *, char *, size_t) = { [SEL_ACCESS] = sel_write_access, [SEL_CREATE] = sel_write_create, [SEL_RELABEL] = sel_write_relabel, [SEL_USER] = sel_write_user, [SEL_MEMBER] = sel_write_member, }; static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) { ino_t ino = file->f_dentry->d_inode->i_ino; char *data; ssize_t rv; if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino]) return -EINVAL; data = simple_transaction_get(file, buf, size); if (IS_ERR(data)) return PTR_ERR(data); rv = write_op[ino](file, data, size); if (rv>0) { simple_transaction_set(file, rv); rv = size; } return rv; } static struct file_operations transaction_ops = { .write = selinux_transaction_write, .read = simple_transaction_read, .release = simple_transaction_release, }; /* * payload - write methods * If the method has a response, the response should be put in buf, * and the length returned. Otherwise return 0 or and -error. */ static ssize_t sel_write_access(struct file * file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid; u16 tclass; u32 req; struct av_decision avd; ssize_t length; length = task_has_security(current, SECURITY__COMPUTE_AV); if (length) return length; length = -ENOMEM; scon = kmalloc(size+1, GFP_KERNEL); if (!scon) return length; memset(scon, 0, size+1); tcon = kmalloc(size+1, GFP_KERNEL); if (!tcon) goto out; memset(tcon, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) goto out2; length = security_context_to_sid(scon, strlen(scon)+1, &ssid); if (length < 0) goto out2; length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); if (length < 0) goto out2; length = security_compute_av(ssid, tsid, tclass, req, &avd); if (length < 0) goto out2; length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%x %x %x %x %u", avd.allowed, avd.decided, avd.auditallow, avd.auditdeny, avd.seqno); out2: kfree(tcon); out: kfree(scon); return length; } static ssize_t sel_write_create(struct file * file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; char *newcon; u32 len; length = task_has_security(current, SECURITY__COMPUTE_CREATE); if (length) return length; length = -ENOMEM; scon = kmalloc(size+1, GFP_KERNEL); if (!scon) return length; memset(scon, 0, size+1); tcon = kmalloc(size+1, GFP_KERNEL); if (!tcon) goto out; memset(tcon, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out2; length = security_context_to_sid(scon, strlen(scon)+1, &ssid); if (length < 0) goto out2; length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); if (length < 0) goto out2; length = security_transition_sid(ssid, tsid, tclass, &newsid); if (length < 0) goto out2; length = security_sid_to_context(newsid, &newcon, &len); if (length < 0) goto out2; if (len > SIMPLE_TRANSACTION_LIMIT) { printk(KERN_ERR "%s: context size (%u) exceeds payload " "max\n", __FUNCTION__, len); length = -ERANGE; goto out3; } memcpy(buf, newcon, len); length = len; out3: kfree(newcon); out2: kfree(tcon); out: kfree(scon); return length; } static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; char *newcon; u32 len; length = task_has_security(current, SECURITY__COMPUTE_RELABEL); if (length) return length; length = -ENOMEM; scon = kmalloc(size+1, GFP_KERNEL); if (!scon) return length; memset(scon, 0, size+1); tcon = kmalloc(size+1, GFP_KERNEL); if (!tcon) goto out; memset(tcon, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out2; length = security_context_to_sid(scon, strlen(scon)+1, &ssid); if (length < 0) goto out2; length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); if (length < 0) goto out2; length = security_change_sid(ssid, tsid, tclass, &newsid); if (length < 0) goto out2; length = security_sid_to_context(newsid, &newcon, &len); if (length < 0) goto out2; if (len > SIMPLE_TRANSACTION_LIMIT) { length = -ERANGE; goto out3; } memcpy(buf, newcon, len); length = len; out3: kfree(newcon); out2: kfree(tcon); out: kfree(scon); return length; } static ssize_t sel_write_user(struct file * file, char *buf, size_t size) { char *con, *user, *ptr; u32 sid, *sids; ssize_t length; char *newcon; int i, rc; u32 len, nsids; length = task_has_security(current, SECURITY__COMPUTE_USER); if (length) return length; length = -ENOMEM; con = kmalloc(size+1, GFP_KERNEL); if (!con) return length; memset(con, 0, size+1); user = kmalloc(size+1, GFP_KERNEL); if (!user) goto out; memset(user, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s", con, user) != 2) goto out2; length = security_context_to_sid(con, strlen(con)+1, &sid); if (length < 0) goto out2; length = security_get_user_sids(sid, user, &sids, &nsids); if (length < 0) goto out2; length = sprintf(buf, "%u", nsids) + 1; ptr = buf + length; for (i = 0; i < nsids; i++) { rc = security_sid_to_context(sids[i], &newcon, &len); if (rc) { length = rc; goto out3; } if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { kfree(newcon); length = -ERANGE; goto out3; } memcpy(ptr, newcon, len); kfree(newcon); ptr += len; length += len; } out3: kfree(sids); out2: kfree(user); out: kfree(con); return length; } static ssize_t sel_write_member(struct file * file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid, newsid; u16 tclass; ssize_t length; char *newcon; u32 len; length = task_has_security(current, SECURITY__COMPUTE_MEMBER); if (length) return length; length = -ENOMEM; scon = kmalloc(size+1, GFP_KERNEL); if (!scon) return length; memset(scon, 0, size+1); tcon = kmalloc(size+1, GFP_KERNEL); if (!tcon) goto out; memset(tcon, 0, size+1); length = -EINVAL; if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) goto out2; length = security_context_to_sid(scon, strlen(scon)+1, &ssid); if (length < 0) goto out2; length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); if (length < 0) goto out2; length = security_member_sid(ssid, tsid, tclass, &newsid); if (length < 0) goto out2; length = security_sid_to_context(newsid, &newcon, &len); if (length < 0) goto out2; if (len > SIMPLE_TRANSACTION_LIMIT) { printk(KERN_ERR "%s: context size (%u) exceeds payload " "max\n", __FUNCTION__, len); length = -ERANGE; goto out3; } memcpy(buf, newcon, len); length = len; out3: kfree(newcon); out2: kfree(tcon); out: kfree(scon); return length; } static struct inode *sel_make_inode(struct super_block *sb, int mode) { struct inode *ret = new_inode(sb); if (ret) { ret->i_mode = mode; ret->i_uid = ret->i_gid = 0; ret->i_blksize = PAGE_CACHE_SIZE; ret->i_blocks = 0; ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; } return ret; } #define BOOL_INO_OFFSET 30 static ssize_t sel_read_bool(struct file *filep, char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; ssize_t length; ssize_t end; ssize_t ret; int cur_enforcing; struct inode *inode; down(&sel_sem); ret = -EFAULT; /* check to see if this file has been deleted */ if (!filep->f_op) goto out; if (count < 0 || count > PAGE_SIZE) { ret = -EINVAL; goto out; } if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { ret = -ENOMEM; goto out; } inode = filep->f_dentry->d_inode; cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); if (cur_enforcing < 0) { ret = cur_enforcing; goto out; } length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); if (length < 0) { ret = length; goto out; } if (*ppos >= length) { ret = 0; goto out; } if (count + *ppos > length) count = length - *ppos; end = count + *ppos; if (copy_to_user(buf, (char *) page + *ppos, count)) { ret = -EFAULT; goto out; } *ppos = end; ret = count; out: up(&sel_sem); if (page) free_page((unsigned long)page); return ret; } static ssize_t sel_write_bool(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; ssize_t length = -EFAULT; int new_value; struct inode *inode; down(&sel_sem); length = task_has_security(current, SECURITY__SETBOOL); if (length) goto out; /* check to see if this file has been deleted */ if (!filep->f_op) goto out; if (count < 0 || count >= PAGE_SIZE) { length = -ENOMEM; goto out; } if (*ppos != 0) { /* No partial writes. */ goto out; } page = (char*)get_zeroed_page(GFP_KERNEL); if (!page) { length = -ENOMEM; goto out; } if (copy_from_user(page, buf, count)) goto out; length = -EINVAL; if (sscanf(page, "%d", &new_value) != 1) goto out; if (new_value) new_value = 1; inode = filep->f_dentry->d_inode; bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; length = count; out: up(&sel_sem); if (page) free_page((unsigned long) page); return length; } static struct file_operations sel_bool_ops = { .read = sel_read_bool, .write = sel_write_bool, }; static ssize_t sel_commit_bools_write(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; ssize_t length = -EFAULT; int new_value; down(&sel_sem); length = task_has_security(current, SECURITY__SETBOOL); if (length) goto out; /* check to see if this file has been deleted */ if (!filep->f_op) goto out; if (count < 0 || count >= PAGE_SIZE) { length = -ENOMEM; goto out; } if (*ppos != 0) { /* No partial writes. */ goto out; } page = (char*)get_zeroed_page(GFP_KERNEL); if (!page) { length = -ENOMEM; goto out; } if (copy_from_user(page, buf, count)) goto out; length = -EINVAL; if (sscanf(page, "%d", &new_value) != 1) goto out; if (new_value) { security_set_bools(bool_num, bool_pending_values); } length = count; out: up(&sel_sem); if (page) free_page((unsigned long) page); return length; } static struct file_operations sel_commit_bools_ops = { .write = sel_commit_bools_write, }; /* delete booleans - partial revoke() from * fs/proc/generic.c proc_kill_inodes */ static void sel_remove_bools(struct dentry *de) { struct list_head *p, *node; struct super_block *sb = de->d_sb; spin_lock(&dcache_lock); node = de->d_subdirs.next; while (node != &de->d_subdirs) { struct dentry *d = list_entry(node, struct dentry, d_child); list_del_init(node); if (d->d_inode) { d = dget_locked(d); spin_unlock(&dcache_lock); d_delete(d); simple_unlink(de->d_inode, d); dput(d); spin_lock(&dcache_lock); } node = de->d_subdirs.next; } spin_unlock(&dcache_lock); file_list_lock(); list_for_each(p, &sb->s_files) { struct file * filp = list_entry(p, struct file, f_list); struct dentry * dentry = filp->f_dentry; if (dentry->d_parent != de) { continue; } filp->f_op = NULL; } file_list_unlock(); } #define BOOL_DIR_NAME "booleans" static int sel_make_bools(void) { int i, ret = 0; ssize_t len; struct dentry *dentry = NULL; struct dentry *dir = bool_dir; struct inode *inode = NULL; struct inode_security_struct *isec; char **names = NULL, *page; int num; int *values = NULL; u32 sid; /* remove any existing files */ kfree(bool_pending_values); sel_remove_bools(dir); if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) return -ENOMEM; ret = security_get_bools(&num, &names, &values); if (ret != 0) goto out; for (i = 0; i < num; i++) { dentry = d_alloc_name(dir, names[i]); if (!dentry) { ret = -ENOMEM; goto err; } inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); if (!inode) { ret = -ENOMEM; goto err; } len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); if (len < 0) { ret = -EINVAL; goto err; } else if (len >= PAGE_SIZE) { ret = -ENAMETOOLONG; goto err; } isec = (struct inode_security_struct*)inode->i_security; if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) goto err; isec->sid = sid; isec->initialized = 1; inode->i_fop = &sel_bool_ops; inode->i_ino = i + BOOL_INO_OFFSET; d_add(dentry, inode); } bool_num = num; bool_pending_values = values; out: free_page((unsigned long)page); if (names) { for (i = 0; i < num; i++) kfree(names[i]); kfree(names); } return ret; err: d_genocide(dir); ret = -ENOMEM; goto out; } #define NULL_FILE_NAME "null" struct dentry *selinux_null = NULL; static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static ssize_t sel_write_avc_cache_threshold(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { char *page; ssize_t ret; int new_value; if (count < 0 || count >= PAGE_SIZE) { ret = -ENOMEM; goto out; } if (*ppos != 0) { /* No partial writes. */ ret = -EINVAL; goto out; } page = (char*)get_zeroed_page(GFP_KERNEL); if (!page) { ret = -ENOMEM; goto out; } if (copy_from_user(page, buf, count)) { ret = -EFAULT; goto out_free; } if (sscanf(page, "%u", &new_value) != 1) { ret = -EINVAL; goto out; } if (new_value != avc_cache_threshold) { ret = task_has_security(current, SECURITY__SETSECPARAM); if (ret) goto out_free; avc_cache_threshold = new_value; } ret = count; out_free: free_page((unsigned long)page); out: return ret; } static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, size_t count, loff_t *ppos) { char *page; ssize_t ret = 0; page = (char *)__get_free_page(GFP_KERNEL); if (!page) { ret = -ENOMEM; goto out; } ret = avc_get_hash_stats(page); if (ret >= 0) ret = simple_read_from_buffer(buf, count, ppos, page, ret); free_page((unsigned long)page); out: return ret; } static struct file_operations sel_avc_cache_threshold_ops = { .read = sel_read_avc_cache_threshold, .write = sel_write_avc_cache_threshold, }; static struct file_operations sel_avc_hash_stats_ops = { .read = sel_read_avc_hash_stats, }; #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) { int cpu; for (cpu = *idx; cpu < NR_CPUS; ++cpu) { if (!cpu_possible(cpu)) continue; *idx = cpu + 1; return &per_cpu(avc_cache_stats, cpu); } return NULL; } static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) { loff_t n = *pos - 1; if (*pos == 0) return SEQ_START_TOKEN; return sel_avc_get_stat_idx(&n); } static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) { return sel_avc_get_stat_idx(pos); } static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) { struct avc_cache_stats *st = v; if (v == SEQ_START_TOKEN) seq_printf(seq, "lookups hits misses allocations reclaims " "frees\n"); else seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, st->hits, st->misses, st->allocations, st->reclaims, st->frees); return 0; } static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) { } static struct seq_operations sel_avc_cache_stats_seq_ops = { .start = sel_avc_stats_seq_start, .next = sel_avc_stats_seq_next, .show = sel_avc_stats_seq_show, .stop = sel_avc_stats_seq_stop, }; static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) { return seq_open(file, &sel_avc_cache_stats_seq_ops); } static struct file_operations sel_avc_cache_stats_ops = { .open = sel_open_avc_cache_stats, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; #endif static int sel_make_avc_files(struct dentry *dir) { int i, ret = 0; static struct tree_descr files[] = { { "cache_threshold", &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, #endif }; for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) { struct inode *inode; struct dentry *dentry; dentry = d_alloc_name(dir, files[i].name); if (!dentry) { ret = -ENOMEM; goto err; } inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); if (!inode) { ret = -ENOMEM; goto err; } inode->i_fop = files[i].ops; d_add(dentry, inode); } out: return ret; err: d_genocide(dir); goto out; } static int sel_make_dir(struct super_block *sb, struct dentry *dentry) { int ret = 0; struct inode *inode; inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) { ret = -ENOMEM; goto out; } inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; d_add(dentry, inode); out: return ret; } static int sel_fill_super(struct super_block * sb, void * data, int silent) { int ret; struct dentry *dentry; struct inode *inode; struct inode_security_struct *isec; static struct tree_descr selinux_files[] = { [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, [SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO}, [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, /* last one */ {""} }; ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); if (ret) return ret; dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); if (!dentry) return -ENOMEM; inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) goto out; inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; d_add(dentry, inode); bool_dir = dentry; ret = sel_make_bools(); if (ret) goto out; dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); if (!dentry) return -ENOMEM; inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); if (!inode) goto out; isec = (struct inode_security_struct*)inode->i_security; isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; isec->initialized = 1; init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); d_add(dentry, inode); selinux_null = dentry; dentry = d_alloc_name(sb->s_root, "avc"); if (!dentry) return -ENOMEM; ret = sel_make_dir(sb, dentry); if (ret) goto out; ret = sel_make_avc_files(dentry); if (ret) goto out; return 0; out: dput(dentry); printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); return -ENOMEM; } static struct super_block *sel_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return get_sb_single(fs_type, flags, data, sel_fill_super); } static struct file_system_type sel_fs_type = { .name = "selinuxfs", .get_sb = sel_get_sb, .kill_sb = kill_litter_super, }; struct vfsmount *selinuxfs_mount; static int __init init_sel_fs(void) { int err; if (!selinux_enabled) return 0; err = register_filesystem(&sel_fs_type); if (!err) { selinuxfs_mount = kern_mount(&sel_fs_type); if (IS_ERR(selinuxfs_mount)) { printk(KERN_ERR "selinuxfs: could not mount!\n"); err = PTR_ERR(selinuxfs_mount); selinuxfs_mount = NULL; } } return err; } __initcall(init_sel_fs); #ifdef CONFIG_SECURITY_SELINUX_DISABLE void exit_sel_fs(void) { unregister_filesystem(&sel_fs_type); } #endif