diff options
Diffstat (limited to 'kernel/security/selinux/selinuxfs.c')
| -rw-r--r-- | kernel/security/selinux/selinuxfs.c | 1893 |
1 files changed, 1893 insertions, 0 deletions
diff --git a/kernel/security/selinux/selinuxfs.c b/kernel/security/selinux/selinuxfs.c new file mode 100644 index 000000000..3d2201413 --- /dev/null +++ b/kernel/security/selinux/selinuxfs.c @@ -0,0 +1,1893 @@ +/* Updated: Karl MacMillan <kmacmillan@tresys.com> + * + * Added conditional policy language extensions + * + * Updated: Hewlett-Packard <paul@paul-moore.com> + * + * Added support for the policy capability bitmap + * + * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. + * 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/kernel.h> +#include <linux/pagemap.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include <linux/mutex.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 <linux/audit.h> +#include <linux/uaccess.h> +#include <linux/kobject.h> +#include <linux/ctype.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" + +/* Policy capability filenames */ +static char *policycap_names[] = { + "network_peer_controls", + "open_perms", + "redhat1", + "always_check_network" +}; + +unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; + +static int __init checkreqprot_setup(char *str) +{ + unsigned long checkreqprot; + if (!kstrtoul(str, 0, &checkreqprot)) + selinux_checkreqprot = checkreqprot ? 1 : 0; + return 1; +} +__setup("checkreqprot=", checkreqprot_setup); + +static DEFINE_MUTEX(sel_mutex); + +/* global data for booleans */ +static struct dentry *bool_dir; +static int bool_num; +static char **bool_pending_names; +static int *bool_pending_values; + +/* global data for classes */ +static struct dentry *class_dir; +static unsigned long last_class_ino; + +static char policy_opened; + +/* global data for policy capabilities */ +static struct dentry *policycap_dir; + +/* Check whether a task is allowed to use a security operation. */ +static int task_has_security(struct task_struct *tsk, + u32 perms) +{ + const struct task_security_struct *tsec; + u32 sid = 0; + + rcu_read_lock(); + tsec = __task_cred(tsk)->security; + if (tsec) + sid = tsec->sid; + rcu_read_unlock(); + if (!tsec) + return -EACCES; + + return avc_has_perm(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_MEMBER, /* compute polyinstantiation membership decision */ + SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ + SEL_COMPAT_NET, /* whether to use old compat network packet controls */ + SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ + SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ + SEL_STATUS, /* export current status using mmap() */ + SEL_POLICY, /* allow userspace to read the in kernel policy */ + SEL_INO_NEXT, /* The next inode number to use */ +}; + +static unsigned long sel_last_ino = SEL_INO_NEXT - 1; + +#define SEL_INITCON_INO_OFFSET 0x01000000 +#define SEL_BOOL_INO_OFFSET 0x02000000 +#define SEL_CLASS_INO_OFFSET 0x04000000 +#define SEL_POLICYCAP_INO_OFFSET 0x08000000 +#define SEL_INO_MASK 0x00ffffff + +#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 = NULL; + ssize_t length; + int new_value; + + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + 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; + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, + "enforcing=%d old_enforcing=%d auid=%u ses=%u", + new_value, selinux_enforcing, + from_kuid(&init_user_ns, audit_get_loginuid(current)), + audit_get_sessionid(current)); + selinux_enforcing = new_value; + if (selinux_enforcing) + avc_ss_reset(0); + selnl_notify_setenforce(selinux_enforcing); + selinux_status_update_setenforce(selinux_enforcing); + } + length = count; +out: + free_page((unsigned long) page); + return length; +} +#else +#define sel_write_enforce NULL +#endif + +static const struct file_operations sel_enforce_ops = { + .read = sel_read_enforce, + .write = sel_write_enforce, + .llseek = generic_file_llseek, +}; + +static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + char tmpbuf[TMPBUFLEN]; + ssize_t length; + ino_t ino = file_inode(filp)->i_ino; + int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? + security_get_reject_unknown() : !security_get_allow_unknown(); + + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_handle_unknown_ops = { + .read = sel_read_handle_unknown, + .llseek = generic_file_llseek, +}; + +static int sel_open_handle_status(struct inode *inode, struct file *filp) +{ + struct page *status = selinux_kernel_status_page(); + + if (!status) + return -ENOMEM; + + filp->private_data = status; + + return 0; +} + +static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + struct page *status = filp->private_data; + + BUG_ON(!status); + + return simple_read_from_buffer(buf, count, ppos, + page_address(status), + sizeof(struct selinux_kernel_status)); +} + +static int sel_mmap_handle_status(struct file *filp, + struct vm_area_struct *vma) +{ + struct page *status = filp->private_data; + unsigned long size = vma->vm_end - vma->vm_start; + + BUG_ON(!status); + + /* only allows one page from the head */ + if (vma->vm_pgoff > 0 || size != PAGE_SIZE) + return -EIO; + /* disallow writable mapping */ + if (vma->vm_flags & VM_WRITE) + return -EPERM; + /* disallow mprotect() turns it into writable */ + vma->vm_flags &= ~VM_MAYWRITE; + + return remap_pfn_range(vma, vma->vm_start, + page_to_pfn(status), + size, vma->vm_page_prot); +} + +static const struct file_operations sel_handle_status_ops = { + .open = sel_open_handle_status, + .read = sel_read_handle_status, + .mmap = sel_mmap_handle_status, + .llseek = generic_file_llseek, +}; + +#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 = NULL; + ssize_t length; + int new_value; + + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + 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) + goto out; + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, + "selinux=0 auid=%u ses=%u", + from_kuid(&init_user_ns, audit_get_loginuid(current)), + audit_get_sessionid(current)); + } + + length = count; +out: + free_page((unsigned long) page); + return length; +} +#else +#define sel_write_disable NULL +#endif + +static const struct file_operations sel_disable_ops = { + .write = sel_write_disable, + .llseek = generic_file_llseek, +}; + +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 const struct file_operations sel_policyvers_ops = { + .read = sel_read_policyvers, + .llseek = generic_file_llseek, +}; + +/* declaration for sel_write_load */ +static int sel_make_bools(void); +static int sel_make_classes(void); +static int sel_make_policycap(void); + +/* declaration for sel_make_class_dirs */ +static struct dentry *sel_make_dir(struct dentry *dir, const char *name, + unsigned long *ino); + +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", + security_mls_enabled()); + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_mls_ops = { + .read = sel_read_mls, + .llseek = generic_file_llseek, +}; + +struct policy_load_memory { + size_t len; + void *data; +}; + +static int sel_open_policy(struct inode *inode, struct file *filp) +{ + struct policy_load_memory *plm = NULL; + int rc; + + BUG_ON(filp->private_data); + + mutex_lock(&sel_mutex); + + rc = task_has_security(current, SECURITY__READ_POLICY); + if (rc) + goto err; + + rc = -EBUSY; + if (policy_opened) + goto err; + + rc = -ENOMEM; + plm = kzalloc(sizeof(*plm), GFP_KERNEL); + if (!plm) + goto err; + + if (i_size_read(inode) != security_policydb_len()) { + mutex_lock(&inode->i_mutex); + i_size_write(inode, security_policydb_len()); + mutex_unlock(&inode->i_mutex); + } + + rc = security_read_policy(&plm->data, &plm->len); + if (rc) + goto err; + + policy_opened = 1; + + filp->private_data = plm; + + mutex_unlock(&sel_mutex); + + return 0; +err: + mutex_unlock(&sel_mutex); + + if (plm) + vfree(plm->data); + kfree(plm); + return rc; +} + +static int sel_release_policy(struct inode *inode, struct file *filp) +{ + struct policy_load_memory *plm = filp->private_data; + + BUG_ON(!plm); + + policy_opened = 0; + + vfree(plm->data); + kfree(plm); + + return 0; +} + +static ssize_t sel_read_policy(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + struct policy_load_memory *plm = filp->private_data; + int ret; + + mutex_lock(&sel_mutex); + + ret = task_has_security(current, SECURITY__READ_POLICY); + if (ret) + goto out; + + ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); +out: + mutex_unlock(&sel_mutex); + return ret; +} + +static int sel_mmap_policy_fault(struct vm_area_struct *vma, + struct vm_fault *vmf) +{ + struct policy_load_memory *plm = vma->vm_file->private_data; + unsigned long offset; + struct page *page; + + if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) + return VM_FAULT_SIGBUS; + + offset = vmf->pgoff << PAGE_SHIFT; + if (offset >= roundup(plm->len, PAGE_SIZE)) + return VM_FAULT_SIGBUS; + + page = vmalloc_to_page(plm->data + offset); + get_page(page); + + vmf->page = page; + + return 0; +} + +static struct vm_operations_struct sel_mmap_policy_ops = { + .fault = sel_mmap_policy_fault, + .page_mkwrite = sel_mmap_policy_fault, +}; + +static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) +{ + if (vma->vm_flags & VM_SHARED) { + /* do not allow mprotect to make mapping writable */ + vma->vm_flags &= ~VM_MAYWRITE; + + if (vma->vm_flags & VM_WRITE) + return -EACCES; + } + + vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; + vma->vm_ops = &sel_mmap_policy_ops; + + return 0; +} + +static const struct file_operations sel_policy_ops = { + .open = sel_open_policy, + .read = sel_read_policy, + .mmap = sel_mmap_policy, + .release = sel_release_policy, + .llseek = generic_file_llseek, +}; + +static ssize_t sel_write_load(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) + +{ + ssize_t length; + void *data = NULL; + + mutex_lock(&sel_mutex); + + length = task_has_security(current, SECURITY__LOAD_POLICY); + if (length) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -EFBIG; + if (count > 64 * 1024 * 1024) + goto out; + + length = -ENOMEM; + data = vmalloc(count); + if (!data) + goto out; + + length = -EFAULT; + if (copy_from_user(data, buf, count) != 0) + goto out; + + length = security_load_policy(data, count); + if (length) + goto out; + + length = sel_make_bools(); + if (length) + goto out1; + + length = sel_make_classes(); + if (length) + goto out1; + + length = sel_make_policycap(); + if (length) + goto out1; + + length = count; + +out1: + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, + "policy loaded auid=%u ses=%u", + from_kuid(&init_user_ns, audit_get_loginuid(current)), + audit_get_sessionid(current)); +out: + mutex_unlock(&sel_mutex); + vfree(data); + return length; +} + +static const struct file_operations sel_load_ops = { + .write = sel_write_load, + .llseek = generic_file_llseek, +}; + +static ssize_t sel_write_context(struct file *file, char *buf, size_t size) +{ + char *canon = NULL; + u32 sid, len; + ssize_t length; + + length = task_has_security(current, SECURITY__CHECK_CONTEXT); + if (length) + goto out; + + length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); + if (length) + goto out; + + length = security_sid_to_context(sid, &canon, &len); + if (length) + goto out; + + length = -ERANGE; + if (len > SIMPLE_TRANSACTION_LIMIT) { + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); + goto out; + } + + memcpy(buf, canon, len); + length = len; +out: + kfree(canon); + return length; +} + +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 = NULL; + ssize_t length; + unsigned int new_value; + + length = task_has_security(current, SECURITY__SETCHECKREQPROT); + if (length) + goto out; + + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + 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 const struct file_operations sel_checkreqprot_ops = { + .read = sel_read_checkreqprot, + .write = sel_write_checkreqprot, + .llseek = generic_file_llseek, +}; + +/* + * 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, + [SEL_CONTEXT] = sel_write_context, +}; + +static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) +{ + ino_t ino = file_inode(file)->i_ino; + char *data; + ssize_t rv; + + if (ino >= ARRAY_SIZE(write_op) || !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 const struct file_operations transaction_ops = { + .write = selinux_transaction_write, + .read = simple_transaction_read, + .release = simple_transaction_release, + .llseek = generic_file_llseek, +}; + +/* + * 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 = NULL, *tcon = NULL; + u32 ssid, tsid; + u16 tclass; + struct av_decision avd; + ssize_t length; + + length = task_has_security(current, SECURITY__COMPUTE_AV); + if (length) + goto out; + + length = -ENOMEM; + scon = kzalloc(size + 1, GFP_KERNEL); + if (!scon) + goto out; + + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); + if (!tcon) + goto out; + + length = -EINVAL; + if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) + goto out; + + length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; + + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; + + security_compute_av_user(ssid, tsid, tclass, &avd); + + length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, + "%x %x %x %x %u %x", + avd.allowed, 0xffffffff, + avd.auditallow, avd.auditdeny, + avd.seqno, avd.flags); +out: + kfree(tcon); + kfree(scon); + return length; +} + +static ssize_t sel_write_create(struct file *file, char *buf, size_t size) +{ + char *scon = NULL, *tcon = NULL; + char *namebuf = NULL, *objname = NULL; + u32 ssid, tsid, newsid; + u16 tclass; + ssize_t length; + char *newcon = NULL; + u32 len; + int nargs; + + length = task_has_security(current, SECURITY__COMPUTE_CREATE); + if (length) + goto out; + + length = -ENOMEM; + scon = kzalloc(size + 1, GFP_KERNEL); + if (!scon) + goto out; + + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); + if (!tcon) + goto out; + + length = -ENOMEM; + namebuf = kzalloc(size + 1, GFP_KERNEL); + if (!namebuf) + goto out; + + length = -EINVAL; + nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); + if (nargs < 3 || nargs > 4) + goto out; + if (nargs == 4) { + /* + * If and when the name of new object to be queried contains + * either whitespace or multibyte characters, they shall be + * encoded based on the percentage-encoding rule. + * If not encoded, the sscanf logic picks up only left-half + * of the supplied name; splitted by a whitespace unexpectedly. + */ + char *r, *w; + int c1, c2; + + r = w = namebuf; + do { + c1 = *r++; + if (c1 == '+') + c1 = ' '; + else if (c1 == '%') { + c1 = hex_to_bin(*r++); + if (c1 < 0) + goto out; + c2 = hex_to_bin(*r++); + if (c2 < 0) + goto out; + c1 = (c1 << 4) | c2; + } + *w++ = c1; + } while (c1 != '\0'); + + objname = namebuf; + } + + length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; + + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; + + length = security_transition_sid_user(ssid, tsid, tclass, + objname, &newsid); + if (length) + goto out; + + length = security_sid_to_context(newsid, &newcon, &len); + if (length) + goto out; + + length = -ERANGE; + if (len > SIMPLE_TRANSACTION_LIMIT) { + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); + goto out; + } + + memcpy(buf, newcon, len); + length = len; +out: + kfree(newcon); + kfree(namebuf); + kfree(tcon); + kfree(scon); + return length; +} + +static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) +{ + char *scon = NULL, *tcon = NULL; + u32 ssid, tsid, newsid; + u16 tclass; + ssize_t length; + char *newcon = NULL; + u32 len; + + length = task_has_security(current, SECURITY__COMPUTE_RELABEL); + if (length) + goto out; + + length = -ENOMEM; + scon = kzalloc(size + 1, GFP_KERNEL); + if (!scon) + goto out; + + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); + if (!tcon) + goto out; + + length = -EINVAL; + if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) + goto out; + + length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; + + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; + + length = security_change_sid(ssid, tsid, tclass, &newsid); + if (length) + goto out; + + length = security_sid_to_context(newsid, &newcon, &len); + if (length) + goto out; + + length = -ERANGE; + if (len > SIMPLE_TRANSACTION_LIMIT) + goto out; + + memcpy(buf, newcon, len); + length = len; +out: + kfree(newcon); + kfree(tcon); + kfree(scon); + return length; +} + +static ssize_t sel_write_user(struct file *file, char *buf, size_t size) +{ + char *con = NULL, *user = NULL, *ptr; + u32 sid, *sids = NULL; + ssize_t length; + char *newcon; + int i, rc; + u32 len, nsids; + + length = task_has_security(current, SECURITY__COMPUTE_USER); + if (length) + goto out; + + length = -ENOMEM; + con = kzalloc(size + 1, GFP_KERNEL); + if (!con) + goto out; + + length = -ENOMEM; + user = kzalloc(size + 1, GFP_KERNEL); + if (!user) + goto out; + + length = -EINVAL; + if (sscanf(buf, "%s %s", con, user) != 2) + goto out; + + length = security_context_to_sid(con, strlen(con) + 1, &sid, GFP_KERNEL); + if (length) + goto out; + + length = security_get_user_sids(sid, user, &sids, &nsids); + if (length) + goto out; + + 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 out; + } + if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { + kfree(newcon); + length = -ERANGE; + goto out; + } + memcpy(ptr, newcon, len); + kfree(newcon); + ptr += len; + length += len; + } +out: + kfree(sids); + kfree(user); + kfree(con); + return length; +} + +static ssize_t sel_write_member(struct file *file, char *buf, size_t size) +{ + char *scon = NULL, *tcon = NULL; + u32 ssid, tsid, newsid; + u16 tclass; + ssize_t length; + char *newcon = NULL; + u32 len; + + length = task_has_security(current, SECURITY__COMPUTE_MEMBER); + if (length) + goto out; + + length = -ENOMEM; + scon = kzalloc(size + 1, GFP_KERNEL); + if (!scon) + goto out; + + length = -ENOMEM; + tcon = kzalloc(size + 1, GFP_KERNEL); + if (!tcon) + goto out; + + length = -EINVAL; + if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) + goto out; + + length = security_context_to_sid(scon, strlen(scon) + 1, &ssid, + GFP_KERNEL); + if (length) + goto out; + + length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid, + GFP_KERNEL); + if (length) + goto out; + + length = security_member_sid(ssid, tsid, tclass, &newsid); + if (length) + goto out; + + length = security_sid_to_context(newsid, &newcon, &len); + if (length) + goto out; + + length = -ERANGE; + if (len > SIMPLE_TRANSACTION_LIMIT) { + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); + goto out; + } + + memcpy(buf, newcon, len); + length = len; +out: + kfree(newcon); + kfree(tcon); + 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_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; + } + return ret; +} + +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 ret; + int cur_enforcing; + unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; + + mutex_lock(&sel_mutex); + + ret = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) + goto out; + + ret = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + cur_enforcing = security_get_bool_value(index); + if (cur_enforcing < 0) { + ret = cur_enforcing; + goto out; + } + length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, + bool_pending_values[index]); + ret = simple_read_from_buffer(buf, count, ppos, page, length); +out: + mutex_unlock(&sel_mutex); + 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; + int new_value; + unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; + + mutex_lock(&sel_mutex); + + length = task_has_security(current, SECURITY__SETBOOL); + if (length) + goto out; + + length = -EINVAL; + if (index >= bool_num || strcmp(name, bool_pending_names[index])) + goto out; + + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + 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) + new_value = 1; + + bool_pending_values[index] = new_value; + length = count; + +out: + mutex_unlock(&sel_mutex); + free_page((unsigned long) page); + return length; +} + +static const struct file_operations sel_bool_ops = { + .read = sel_read_bool, + .write = sel_write_bool, + .llseek = generic_file_llseek, +}; + +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; + int new_value; + + mutex_lock(&sel_mutex); + + length = task_has_security(current, SECURITY__SETBOOL); + if (length) + goto out; + + length = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + length = -EINVAL; + if (*ppos != 0) + goto out; + + length = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + length = -EFAULT; + if (copy_from_user(page, buf, count)) + goto out; + + length = -EINVAL; + if (sscanf(page, "%d", &new_value) != 1) + goto out; + + length = 0; + if (new_value && bool_pending_values) + length = security_set_bools(bool_num, bool_pending_values); + + if (!length) + length = count; + +out: + mutex_unlock(&sel_mutex); + free_page((unsigned long) page); + return length; +} + +static const struct file_operations sel_commit_bools_ops = { + .write = sel_commit_bools_write, + .llseek = generic_file_llseek, +}; + +static void sel_remove_entries(struct dentry *de) +{ + d_genocide(de); + shrink_dcache_parent(de); +} + +#define BOOL_DIR_NAME "booleans" + +static int sel_make_bools(void) +{ + int i, ret; + 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 */ + for (i = 0; i < bool_num; i++) + kfree(bool_pending_names[i]); + kfree(bool_pending_names); + kfree(bool_pending_values); + bool_num = 0; + bool_pending_names = NULL; + bool_pending_values = NULL; + + sel_remove_entries(dir); + + ret = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + ret = security_get_bools(&num, &names, &values); + if (ret) + goto out; + + for (i = 0; i < num; i++) { + ret = -ENOMEM; + dentry = d_alloc_name(dir, names[i]); + if (!dentry) + goto out; + + ret = -ENOMEM; + inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); + if (!inode) + goto out; + + ret = -ENAMETOOLONG; + len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); + if (len >= PAGE_SIZE) + goto out; + + isec = (struct inode_security_struct *)inode->i_security; + ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); + if (ret) + goto out; + + isec->sid = sid; + isec->initialized = 1; + inode->i_fop = &sel_bool_ops; + inode->i_ino = i|SEL_BOOL_INO_OFFSET; + d_add(dentry, inode); + } + bool_num = num; + bool_pending_names = names; + bool_pending_values = values; + + free_page((unsigned long)page); + return 0; +out: + free_page((unsigned long)page); + + if (names) { + for (i = 0; i < num; i++) + kfree(names[i]); + kfree(names); + } + kfree(values); + sel_remove_entries(dir); + + return ret; +} + +#define NULL_FILE_NAME "null" + +struct path selinux_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 = NULL; + ssize_t ret; + int new_value; + + ret = task_has_security(current, SECURITY__SETSECPARAM); + if (ret) + goto out; + + ret = -ENOMEM; + if (count >= PAGE_SIZE) + goto out; + + /* No partial writes. */ + ret = -EINVAL; + if (*ppos != 0) + goto out; + + ret = -ENOMEM; + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + goto out; + + ret = -EFAULT; + if (copy_from_user(page, buf, count)) + goto out; + + ret = -EINVAL; + if (sscanf(page, "%u", &new_value) != 1) + goto out; + + avc_cache_threshold = new_value; + + ret = count; +out: + free_page((unsigned long)page); + 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 length; + + page = (char *)__get_free_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + + length = avc_get_hash_stats(page); + if (length >= 0) + length = simple_read_from_buffer(buf, count, ppos, page, length); + free_page((unsigned long)page); + + return length; +} + +static const struct file_operations sel_avc_cache_threshold_ops = { + .read = sel_read_avc_cache_threshold, + .write = sel_write_avc_cache_threshold, + .llseek = generic_file_llseek, +}; + +static const struct file_operations sel_avc_hash_stats_ops = { + .read = sel_read_avc_hash_stats, + .llseek = generic_file_llseek, +}; + +#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_cpu_ids; ++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 { + unsigned int lookups = st->lookups; + unsigned int misses = st->misses; + unsigned int hits = lookups - misses; + seq_printf(seq, "%u %u %u %u %u %u\n", lookups, + hits, misses, st->allocations, + st->reclaims, st->frees); + } + return 0; +} + +static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) +{ } + +static const 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 const 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; + 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 < ARRAY_SIZE(files); i++) { + struct inode *inode; + struct dentry *dentry; + + dentry = d_alloc_name(dir, files[i].name); + if (!dentry) + return -ENOMEM; + + inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); + if (!inode) + return -ENOMEM; + + inode->i_fop = files[i].ops; + inode->i_ino = ++sel_last_ino; + d_add(dentry, inode); + } + + return 0; +} + +static ssize_t sel_read_initcon(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + char *con; + u32 sid, len; + ssize_t ret; + + sid = file_inode(file)->i_ino&SEL_INO_MASK; + ret = security_sid_to_context(sid, &con, &len); + if (ret) + return ret; + + ret = simple_read_from_buffer(buf, count, ppos, con, len); + kfree(con); + return ret; +} + +static const struct file_operations sel_initcon_ops = { + .read = sel_read_initcon, + .llseek = generic_file_llseek, +}; + +static int sel_make_initcon_files(struct dentry *dir) +{ + int i; + + for (i = 1; i <= SECINITSID_NUM; i++) { + struct inode *inode; + struct dentry *dentry; + dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); + if (!dentry) + return -ENOMEM; + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) + return -ENOMEM; + + inode->i_fop = &sel_initcon_ops; + inode->i_ino = i|SEL_INITCON_INO_OFFSET; + d_add(dentry, inode); + } + + return 0; +} + +static inline unsigned long sel_class_to_ino(u16 class) +{ + return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; +} + +static inline u16 sel_ino_to_class(unsigned long ino) +{ + return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); +} + +static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) +{ + return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; +} + +static inline u32 sel_ino_to_perm(unsigned long ino) +{ + return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); +} + +static ssize_t sel_read_class(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + unsigned long ino = file_inode(file)->i_ino; + char res[TMPBUFLEN]; + ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); + return simple_read_from_buffer(buf, count, ppos, res, len); +} + +static const struct file_operations sel_class_ops = { + .read = sel_read_class, + .llseek = generic_file_llseek, +}; + +static ssize_t sel_read_perm(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + unsigned long ino = file_inode(file)->i_ino; + char res[TMPBUFLEN]; + ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); + return simple_read_from_buffer(buf, count, ppos, res, len); +} + +static const struct file_operations sel_perm_ops = { + .read = sel_read_perm, + .llseek = generic_file_llseek, +}; + +static ssize_t sel_read_policycap(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int value; + char tmpbuf[TMPBUFLEN]; + ssize_t length; + unsigned long i_ino = file_inode(file)->i_ino; + + value = security_policycap_supported(i_ino & SEL_INO_MASK); + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); + + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_policycap_ops = { + .read = sel_read_policycap, + .llseek = generic_file_llseek, +}; + +static int sel_make_perm_files(char *objclass, int classvalue, + struct dentry *dir) +{ + int i, rc, nperms; + char **perms; + + rc = security_get_permissions(objclass, &perms, &nperms); + if (rc) + return rc; + + for (i = 0; i < nperms; i++) { + struct inode *inode; + struct dentry *dentry; + + rc = -ENOMEM; + dentry = d_alloc_name(dir, perms[i]); + if (!dentry) + goto out; + + rc = -ENOMEM; + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) + goto out; + + inode->i_fop = &sel_perm_ops; + /* i+1 since perm values are 1-indexed */ + inode->i_ino = sel_perm_to_ino(classvalue, i + 1); + d_add(dentry, inode); + } + rc = 0; +out: + for (i = 0; i < nperms; i++) + kfree(perms[i]); + kfree(perms); + return rc; +} + +static int sel_make_class_dir_entries(char *classname, int index, + struct dentry *dir) +{ + struct dentry *dentry = NULL; + struct inode *inode = NULL; + int rc; + + dentry = d_alloc_name(dir, "index"); + if (!dentry) + return -ENOMEM; + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) + return -ENOMEM; + + inode->i_fop = &sel_class_ops; + inode->i_ino = sel_class_to_ino(index); + d_add(dentry, inode); + + dentry = sel_make_dir(dir, "perms", &last_class_ino); + if (IS_ERR(dentry)) + return PTR_ERR(dentry); + + rc = sel_make_perm_files(classname, index, dentry); + + return rc; +} + +static int sel_make_classes(void) +{ + int rc, nclasses, i; + char **classes; + + /* delete any existing entries */ + sel_remove_entries(class_dir); + + rc = security_get_classes(&classes, &nclasses); + if (rc) + return rc; + + /* +2 since classes are 1-indexed */ + last_class_ino = sel_class_to_ino(nclasses + 2); + + for (i = 0; i < nclasses; i++) { + struct dentry *class_name_dir; + + class_name_dir = sel_make_dir(class_dir, classes[i], + &last_class_ino); + if (IS_ERR(class_name_dir)) { + rc = PTR_ERR(class_name_dir); + goto out; + } + + /* i+1 since class values are 1-indexed */ + rc = sel_make_class_dir_entries(classes[i], i + 1, + class_name_dir); + if (rc) + goto out; + } + rc = 0; +out: + for (i = 0; i < nclasses; i++) + kfree(classes[i]); + kfree(classes); + return rc; +} + +static int sel_make_policycap(void) +{ + unsigned int iter; + struct dentry *dentry = NULL; + struct inode *inode = NULL; + + sel_remove_entries(policycap_dir); + + for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { + if (iter < ARRAY_SIZE(policycap_names)) + dentry = d_alloc_name(policycap_dir, + policycap_names[iter]); + else + dentry = d_alloc_name(policycap_dir, "unknown"); + + if (dentry == NULL) + return -ENOMEM; + + inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); + if (inode == NULL) + return -ENOMEM; + + inode->i_fop = &sel_policycap_ops; + inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; + d_add(dentry, inode); + } + + return 0; +} + +static struct dentry *sel_make_dir(struct dentry *dir, const char *name, + unsigned long *ino) +{ + struct dentry *dentry = d_alloc_name(dir, name); + struct inode *inode; + + if (!dentry) + return ERR_PTR(-ENOMEM); + + inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); + if (!inode) { + dput(dentry); + return ERR_PTR(-ENOMEM); + } + + inode->i_op = &simple_dir_inode_operations; + inode->i_fop = &simple_dir_operations; + inode->i_ino = ++(*ino); + /* directory inodes start off with i_nlink == 2 (for "." entry) */ + inc_nlink(inode); + d_add(dentry, inode); + /* bump link count on parent directory, too */ + inc_nlink(d_inode(dir)); + + return dentry; +} + +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", &transaction_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}, + [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, + [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, + [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, + [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, + /* last one */ {""} + }; + ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); + if (ret) + goto err; + + bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); + if (IS_ERR(bool_dir)) { + ret = PTR_ERR(bool_dir); + bool_dir = NULL; + goto err; + } + + ret = -ENOMEM; + dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); + if (!dentry) + goto err; + + ret = -ENOMEM; + inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); + if (!inode) + goto err; + + inode->i_ino = ++sel_last_ino; + 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; + + dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); + if (IS_ERR(dentry)) { + ret = PTR_ERR(dentry); + goto err; + } + + ret = sel_make_avc_files(dentry); + if (ret) + goto err; + + dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); + if (IS_ERR(dentry)) { + ret = PTR_ERR(dentry); + goto err; + } + + ret = sel_make_initcon_files(dentry); + if (ret) + goto err; + + class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); + if (IS_ERR(class_dir)) { + ret = PTR_ERR(class_dir); + class_dir = NULL; + goto err; + } + + policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); + if (IS_ERR(policycap_dir)) { + ret = PTR_ERR(policycap_dir); + policycap_dir = NULL; + goto err; + } + return 0; +err: + printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", + __func__); + return ret; +} + +static struct dentry *sel_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return mount_single(fs_type, flags, data, sel_fill_super); +} + +static struct file_system_type sel_fs_type = { + .name = "selinuxfs", + .mount = sel_mount, + .kill_sb = kill_litter_super, +}; + +struct vfsmount *selinuxfs_mount; + +static int __init init_sel_fs(void) +{ + int err; + + if (!selinux_enabled) + return 0; + + err = sysfs_create_mount_point(fs_kobj, "selinux"); + if (err) + return err; + + err = register_filesystem(&sel_fs_type); + if (err) { + sysfs_remove_mount_point(fs_kobj, "selinux"); + return err; + } + + selinux_null.mnt = 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) +{ + sysfs_remove_mount_point(fs_kobj, "selinux"); + kern_unmount(selinuxfs_mount); + unregister_filesystem(&sel_fs_type); +} +#endif |