diff options
Diffstat (limited to 'security/selinux/selinuxfs.c')
| -rw-r--r-- | security/selinux/selinuxfs.c | 1340 |
1 files changed, 1340 insertions, 0 deletions
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c new file mode 100644 index 00000000000..07221568b50 --- /dev/null +++ b/security/selinux/selinuxfs.c @@ -0,0 +1,1340 @@ +/* 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 */ + if (bool_pending_values) + 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++) { + if (names[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 |