| /* 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_VALIDATE_TRANS, /* compute validatetrans decision */ |
| 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; |
| |
| if (count >= PAGE_SIZE) |
| return -ENOMEM; |
| |
| /* No partial writes. */ |
| if (*ppos != 0) |
| return -EINVAL; |
| |
| page = memdup_user_nul(buf, count); |
| if (IS_ERR(page)) |
| return PTR_ERR(page); |
| |
| 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: |
| kfree(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; |
| ssize_t length; |
| int new_value; |
| |
| if (count >= PAGE_SIZE) |
| return -ENOMEM; |
| |
| /* No partial writes. */ |
| if (*ppos != 0) |
| return -EINVAL; |
| |
| page = memdup_user_nul(buf, count); |
| if (IS_ERR(page)) |
| return PTR_ERR(page); |
| |
| 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: |
| kfree(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 const 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; |
| ssize_t length; |
| unsigned int new_value; |
| |
| length = task_has_security(current, SECURITY__SETCHECKREQPROT); |
| if (length) |
| return length; |
| |
| if (count >= PAGE_SIZE) |
| return -ENOMEM; |
| |
| /* No partial writes. */ |
| if (*ppos != 0) |
| return -EINVAL; |
| |
| page = memdup_user_nul(buf, count); |
| if (IS_ERR(page)) |
| return PTR_ERR(page); |
| |
| length = -EINVAL; |
| if (sscanf(page, "%u", &new_value) != 1) |
| goto out; |
| |
| selinux_checkreqprot = new_value ? 1 : 0; |
| length = count; |
| out: |
| kfree(page); |
| return length; |
| } |
| static const struct file_operations sel_checkreqprot_ops = { |
| .read = sel_read_checkreqprot, |
| .write = sel_write_checkreqprot, |
| .llseek = generic_file_llseek, |
| }; |
| |
| static ssize_t sel_write_validatetrans(struct file *file, |
| const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; |
| char *req = NULL; |
| u32 osid, nsid, tsid; |
| u16 tclass; |
| int rc; |
| |
| rc = task_has_security(current, SECURITY__VALIDATE_TRANS); |
| if (rc) |
| goto out; |
| |
| rc = -ENOMEM; |
| if (count >= PAGE_SIZE) |
| goto out; |
| |
| /* No partial writes. */ |
| rc = -EINVAL; |
| if (*ppos != 0) |
| goto out; |
| |
| rc = -ENOMEM; |
| req = kzalloc(count + 1, GFP_KERNEL); |
| if (!req) |
| goto out; |
| |
| rc = -EFAULT; |
| if (copy_from_user(req, buf, count)) |
| goto out; |
| |
| rc = -ENOMEM; |
| oldcon = kzalloc(count + 1, GFP_KERNEL); |
| if (!oldcon) |
| goto out; |
| |
| newcon = kzalloc(count + 1, GFP_KERNEL); |
| if (!newcon) |
| goto out; |
| |
| taskcon = kzalloc(count + 1, GFP_KERNEL); |
| if (!taskcon) |
| goto out; |
| |
| rc = -EINVAL; |
| if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) |
| goto out; |
| |
| rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); |
| if (rc) |
| goto out; |
| |
| rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); |
| if (rc) |
| goto out; |
| |
| rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); |
| if (rc) |
| goto out; |
| |
| rc = security_validate_transition_user(osid, nsid, tsid, tclass); |
| if (!rc) |
| rc = count; |
| out: |
| kfree(req); |
| kfree(oldcon); |
| kfree(newcon); |
| kfree(taskcon); |
| return rc; |
| } |
| |
| static const struct file_operations sel_transition_ops = { |
| .write = sel_write_validatetrans, |
| .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_str_to_sid(scon, &ssid, GFP_KERNEL); |
| if (length) |
| goto out; |
| |
| length = security_context_str_to_sid(tcon, &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_str_to_sid(scon, &ssid, GFP_KERNEL); |
| if (length) |
| goto out; |
| |
| length = security_context_str_to_sid(tcon, &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_str_to_sid(scon, &ssid, GFP_KERNEL); |
| if (length) |
| goto out; |
| |
| length = security_context_str_to_sid(tcon, &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_str_to_sid(con, &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_str_to_sid(scon, &ssid, GFP_KERNEL); |
| if (length) |
| goto out; |
| |
| length = security_context_str_to_sid(tcon, &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; |
| |
| page = memdup_user_nul(buf, count); |
| if (IS_ERR(page)) { |
| length = PTR_ERR(page); |
| page = NULL; |
| 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); |
| kfree(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; |
| |
| page = memdup_user_nul(buf, count); |
| if (IS_ERR(page)) { |
| length = PTR_ERR(page); |
| page = NULL; |
| 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); |
| kfree(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; |
| ssize_t ret; |
| int new_value; |
| |
| ret = task_has_security(current, SECURITY__SETSECPARAM); |
| if (ret) |
| return ret; |
| |
| if (count >= PAGE_SIZE) |
| return -ENOMEM; |
| |
| /* No partial writes. */ |
| if (*ppos != 0) |
| return -EINVAL; |
| |
| page = memdup_user_nul(buf, count); |
| if (IS_ERR(page)) |
| return PTR_ERR(page); |
| |
| ret = -EINVAL; |
| if (sscanf(page, "%u", &new_value) != 1) |
| goto out; |
| |
| avc_cache_threshold = new_value; |
| |
| ret = count; |
| out: |
| kfree(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}, |
| [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
| S_IWUGO}, |
| /* 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 |