11da177e4SLinus Torvalds /* Updated: Karl MacMillan <kmacmillan@tresys.com> 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Added conditional policy language extensions 41da177e4SLinus Torvalds * 53bb56b25SPaul Moore * Updated: Hewlett-Packard <paul.moore@hp.com> 63bb56b25SPaul Moore * 73bb56b25SPaul Moore * Added support for the policy capability bitmap 83bb56b25SPaul Moore * 93bb56b25SPaul Moore * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. 101da177e4SLinus Torvalds * Copyright (C) 2003 - 2004 Tresys Technology, LLC 111da177e4SLinus Torvalds * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> 121da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 131da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 141da177e4SLinus Torvalds * the Free Software Foundation, version 2. 151da177e4SLinus Torvalds */ 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds #include <linux/kernel.h> 181da177e4SLinus Torvalds #include <linux/pagemap.h> 191da177e4SLinus Torvalds #include <linux/slab.h> 201da177e4SLinus Torvalds #include <linux/vmalloc.h> 211da177e4SLinus Torvalds #include <linux/fs.h> 22bb003079SIngo Molnar #include <linux/mutex.h> 231da177e4SLinus Torvalds #include <linux/init.h> 241da177e4SLinus Torvalds #include <linux/string.h> 251da177e4SLinus Torvalds #include <linux/security.h> 261da177e4SLinus Torvalds #include <linux/major.h> 271da177e4SLinus Torvalds #include <linux/seq_file.h> 281da177e4SLinus Torvalds #include <linux/percpu.h> 29af601e46SSteve Grubb #include <linux/audit.h> 30f5269710SEric Paris #include <linux/uaccess.h> 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds /* selinuxfs pseudo filesystem for exporting the security policy API. 331da177e4SLinus Torvalds Based on the proc code and the fs/nfsd/nfsctl.c code. */ 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include "flask.h" 361da177e4SLinus Torvalds #include "avc.h" 371da177e4SLinus Torvalds #include "avc_ss.h" 381da177e4SLinus Torvalds #include "security.h" 391da177e4SLinus Torvalds #include "objsec.h" 401da177e4SLinus Torvalds #include "conditional.h" 411da177e4SLinus Torvalds 423bb56b25SPaul Moore /* Policy capability filenames */ 433bb56b25SPaul Moore static char *policycap_names[] = { 44b0c636b9SEric Paris "network_peer_controls", 45b0c636b9SEric Paris "open_perms" 463bb56b25SPaul Moore }; 473bb56b25SPaul Moore 481da177e4SLinus Torvalds unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds static int __init checkreqprot_setup(char *str) 511da177e4SLinus Torvalds { 52f5269710SEric Paris unsigned long checkreqprot; 53f5269710SEric Paris if (!strict_strtoul(str, 0, &checkreqprot)) 54f5269710SEric Paris selinux_checkreqprot = checkreqprot ? 1 : 0; 551da177e4SLinus Torvalds return 1; 561da177e4SLinus Torvalds } 571da177e4SLinus Torvalds __setup("checkreqprot=", checkreqprot_setup); 581da177e4SLinus Torvalds 59bb003079SIngo Molnar static DEFINE_MUTEX(sel_mutex); 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds /* global data for booleans */ 621872981bSEric Paris static struct dentry *bool_dir; 631872981bSEric Paris static int bool_num; 64d313f948SStephen Smalley static char **bool_pending_names; 651872981bSEric Paris static int *bool_pending_values; 661da177e4SLinus Torvalds 67e47c8fc5SChristopher J. PeBenito /* global data for classes */ 681872981bSEric Paris static struct dentry *class_dir; 69e47c8fc5SChristopher J. PeBenito static unsigned long last_class_ino; 70e47c8fc5SChristopher J. PeBenito 71cee74f47SEric Paris static char policy_opened; 72cee74f47SEric Paris 733bb56b25SPaul Moore /* global data for policy capabilities */ 741872981bSEric Paris static struct dentry *policycap_dir; 753bb56b25SPaul Moore 761da177e4SLinus Torvalds extern void selnl_notify_setenforce(int val); 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds /* Check whether a task is allowed to use a security operation. */ 791da177e4SLinus Torvalds static int task_has_security(struct task_struct *tsk, 801da177e4SLinus Torvalds u32 perms) 811da177e4SLinus Torvalds { 82c69e8d9cSDavid Howells const struct task_security_struct *tsec; 83c69e8d9cSDavid Howells u32 sid = 0; 841da177e4SLinus Torvalds 85c69e8d9cSDavid Howells rcu_read_lock(); 86c69e8d9cSDavid Howells tsec = __task_cred(tsk)->security; 87c69e8d9cSDavid Howells if (tsec) 88c69e8d9cSDavid Howells sid = tsec->sid; 89c69e8d9cSDavid Howells rcu_read_unlock(); 901da177e4SLinus Torvalds if (!tsec) 911da177e4SLinus Torvalds return -EACCES; 921da177e4SLinus Torvalds 93c69e8d9cSDavid Howells return avc_has_perm(sid, SECINITSID_SECURITY, 941da177e4SLinus Torvalds SECCLASS_SECURITY, perms, NULL); 951da177e4SLinus Torvalds } 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds enum sel_inos { 981da177e4SLinus Torvalds SEL_ROOT_INO = 2, 991da177e4SLinus Torvalds SEL_LOAD, /* load policy */ 1001da177e4SLinus Torvalds SEL_ENFORCE, /* get or set enforcing status */ 1011da177e4SLinus Torvalds SEL_CONTEXT, /* validate context */ 1021da177e4SLinus Torvalds SEL_ACCESS, /* compute access decision */ 1031da177e4SLinus Torvalds SEL_CREATE, /* compute create labeling decision */ 1041da177e4SLinus Torvalds SEL_RELABEL, /* compute relabeling decision */ 1051da177e4SLinus Torvalds SEL_USER, /* compute reachable user contexts */ 1061da177e4SLinus Torvalds SEL_POLICYVERS, /* return policy version for this kernel */ 1071da177e4SLinus Torvalds SEL_COMMIT_BOOLS, /* commit new boolean values */ 1081da177e4SLinus Torvalds SEL_MLS, /* return if MLS policy is enabled */ 1091da177e4SLinus Torvalds SEL_DISABLE, /* disable SELinux until next reboot */ 1101da177e4SLinus Torvalds SEL_MEMBER, /* compute polyinstantiation membership decision */ 1111da177e4SLinus Torvalds SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ 1124e5ab4cbSJames Morris SEL_COMPAT_NET, /* whether to use old compat network packet controls */ 1133f12070eSEric Paris SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ 1143f12070eSEric Paris SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ 11511904167SKaiGai Kohei SEL_STATUS, /* export current status using mmap() */ 116cee74f47SEric Paris SEL_POLICY, /* allow userspace to read the in kernel policy */ 1176174eafcSJames Carter SEL_INO_NEXT, /* The next inode number to use */ 1181da177e4SLinus Torvalds }; 1191da177e4SLinus Torvalds 1206174eafcSJames Carter static unsigned long sel_last_ino = SEL_INO_NEXT - 1; 1216174eafcSJames Carter 122f0ee2e46SJames Carter #define SEL_INITCON_INO_OFFSET 0x01000000 123bce34bc0SJames Carter #define SEL_BOOL_INO_OFFSET 0x02000000 124e47c8fc5SChristopher J. PeBenito #define SEL_CLASS_INO_OFFSET 0x04000000 1253bb56b25SPaul Moore #define SEL_POLICYCAP_INO_OFFSET 0x08000000 126f0ee2e46SJames Carter #define SEL_INO_MASK 0x00ffffff 127f0ee2e46SJames Carter 1281da177e4SLinus Torvalds #define TMPBUFLEN 12 1291da177e4SLinus Torvalds static ssize_t sel_read_enforce(struct file *filp, char __user *buf, 1301da177e4SLinus Torvalds size_t count, loff_t *ppos) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 1331da177e4SLinus Torvalds ssize_t length; 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); 1361da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 1401da177e4SLinus Torvalds static ssize_t sel_write_enforce(struct file *file, const char __user *buf, 1411da177e4SLinus Torvalds size_t count, loff_t *ppos) 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds { 1441da177e4SLinus Torvalds char *page; 1451da177e4SLinus Torvalds ssize_t length; 1461da177e4SLinus Torvalds int new_value; 1471da177e4SLinus Torvalds 148bfd51626SDavi Arnaut if (count >= PAGE_SIZE) 1491da177e4SLinus Torvalds return -ENOMEM; 1501da177e4SLinus Torvalds if (*ppos != 0) { 1511da177e4SLinus Torvalds /* No partial writes. */ 1521da177e4SLinus Torvalds return -EINVAL; 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 1551da177e4SLinus Torvalds if (!page) 1561da177e4SLinus Torvalds return -ENOMEM; 1571da177e4SLinus Torvalds length = -EFAULT; 1581da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 1591da177e4SLinus Torvalds goto out; 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds length = -EINVAL; 1621da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 1631da177e4SLinus Torvalds goto out; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds if (new_value != selinux_enforcing) { 1661da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETENFORCE); 1671da177e4SLinus Torvalds if (length) 1681da177e4SLinus Torvalds goto out; 169af601e46SSteve Grubb audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 1704746ec5bSEric Paris "enforcing=%d old_enforcing=%d auid=%u ses=%u", 1714746ec5bSEric Paris new_value, selinux_enforcing, 1724746ec5bSEric Paris audit_get_loginuid(current), 1734746ec5bSEric Paris audit_get_sessionid(current)); 1741da177e4SLinus Torvalds selinux_enforcing = new_value; 1751da177e4SLinus Torvalds if (selinux_enforcing) 1761da177e4SLinus Torvalds avc_ss_reset(0); 1771da177e4SLinus Torvalds selnl_notify_setenforce(selinux_enforcing); 17811904167SKaiGai Kohei selinux_status_update_setenforce(selinux_enforcing); 1791da177e4SLinus Torvalds } 1801da177e4SLinus Torvalds length = count; 1811da177e4SLinus Torvalds out: 1821da177e4SLinus Torvalds free_page((unsigned long) page); 1831da177e4SLinus Torvalds return length; 1841da177e4SLinus Torvalds } 1851da177e4SLinus Torvalds #else 1861da177e4SLinus Torvalds #define sel_write_enforce NULL 1871da177e4SLinus Torvalds #endif 1881da177e4SLinus Torvalds 1899c2e08c5SArjan van de Ven static const struct file_operations sel_enforce_ops = { 1901da177e4SLinus Torvalds .read = sel_read_enforce, 1911da177e4SLinus Torvalds .write = sel_write_enforce, 19257a62c23SArnd Bergmann .llseek = generic_file_llseek, 1931da177e4SLinus Torvalds }; 1941da177e4SLinus Torvalds 1953f12070eSEric Paris static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, 1963f12070eSEric Paris size_t count, loff_t *ppos) 1973f12070eSEric Paris { 1983f12070eSEric Paris char tmpbuf[TMPBUFLEN]; 1993f12070eSEric Paris ssize_t length; 2003f12070eSEric Paris ino_t ino = filp->f_path.dentry->d_inode->i_ino; 2013f12070eSEric Paris int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? 2023f12070eSEric Paris security_get_reject_unknown() : !security_get_allow_unknown(); 2033f12070eSEric Paris 2043f12070eSEric Paris length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); 2053f12070eSEric Paris return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 2063f12070eSEric Paris } 2073f12070eSEric Paris 2083f12070eSEric Paris static const struct file_operations sel_handle_unknown_ops = { 2093f12070eSEric Paris .read = sel_read_handle_unknown, 21057a62c23SArnd Bergmann .llseek = generic_file_llseek, 2113f12070eSEric Paris }; 2123f12070eSEric Paris 21311904167SKaiGai Kohei static int sel_open_handle_status(struct inode *inode, struct file *filp) 21411904167SKaiGai Kohei { 21511904167SKaiGai Kohei struct page *status = selinux_kernel_status_page(); 21611904167SKaiGai Kohei 21711904167SKaiGai Kohei if (!status) 21811904167SKaiGai Kohei return -ENOMEM; 21911904167SKaiGai Kohei 22011904167SKaiGai Kohei filp->private_data = status; 22111904167SKaiGai Kohei 22211904167SKaiGai Kohei return 0; 22311904167SKaiGai Kohei } 22411904167SKaiGai Kohei 22511904167SKaiGai Kohei static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, 22611904167SKaiGai Kohei size_t count, loff_t *ppos) 22711904167SKaiGai Kohei { 22811904167SKaiGai Kohei struct page *status = filp->private_data; 22911904167SKaiGai Kohei 23011904167SKaiGai Kohei BUG_ON(!status); 23111904167SKaiGai Kohei 23211904167SKaiGai Kohei return simple_read_from_buffer(buf, count, ppos, 23311904167SKaiGai Kohei page_address(status), 23411904167SKaiGai Kohei sizeof(struct selinux_kernel_status)); 23511904167SKaiGai Kohei } 23611904167SKaiGai Kohei 23711904167SKaiGai Kohei static int sel_mmap_handle_status(struct file *filp, 23811904167SKaiGai Kohei struct vm_area_struct *vma) 23911904167SKaiGai Kohei { 24011904167SKaiGai Kohei struct page *status = filp->private_data; 24111904167SKaiGai Kohei unsigned long size = vma->vm_end - vma->vm_start; 24211904167SKaiGai Kohei 24311904167SKaiGai Kohei BUG_ON(!status); 24411904167SKaiGai Kohei 24511904167SKaiGai Kohei /* only allows one page from the head */ 24611904167SKaiGai Kohei if (vma->vm_pgoff > 0 || size != PAGE_SIZE) 24711904167SKaiGai Kohei return -EIO; 24811904167SKaiGai Kohei /* disallow writable mapping */ 24911904167SKaiGai Kohei if (vma->vm_flags & VM_WRITE) 25011904167SKaiGai Kohei return -EPERM; 25111904167SKaiGai Kohei /* disallow mprotect() turns it into writable */ 25211904167SKaiGai Kohei vma->vm_flags &= ~VM_MAYWRITE; 25311904167SKaiGai Kohei 25411904167SKaiGai Kohei return remap_pfn_range(vma, vma->vm_start, 25511904167SKaiGai Kohei page_to_pfn(status), 25611904167SKaiGai Kohei size, vma->vm_page_prot); 25711904167SKaiGai Kohei } 25811904167SKaiGai Kohei 25911904167SKaiGai Kohei static const struct file_operations sel_handle_status_ops = { 26011904167SKaiGai Kohei .open = sel_open_handle_status, 26111904167SKaiGai Kohei .read = sel_read_handle_status, 26211904167SKaiGai Kohei .mmap = sel_mmap_handle_status, 26311904167SKaiGai Kohei .llseek = generic_file_llseek, 26411904167SKaiGai Kohei }; 26511904167SKaiGai Kohei 2661da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_DISABLE 2671da177e4SLinus Torvalds static ssize_t sel_write_disable(struct file *file, const char __user *buf, 2681da177e4SLinus Torvalds size_t count, loff_t *ppos) 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvalds { 2711da177e4SLinus Torvalds char *page; 2721da177e4SLinus Torvalds ssize_t length; 2731da177e4SLinus Torvalds int new_value; 2741da177e4SLinus Torvalds extern int selinux_disable(void); 2751da177e4SLinus Torvalds 276bfd51626SDavi Arnaut if (count >= PAGE_SIZE) 2771da177e4SLinus Torvalds return -ENOMEM; 2781da177e4SLinus Torvalds if (*ppos != 0) { 2791da177e4SLinus Torvalds /* No partial writes. */ 2801da177e4SLinus Torvalds return -EINVAL; 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 2831da177e4SLinus Torvalds if (!page) 2841da177e4SLinus Torvalds return -ENOMEM; 2851da177e4SLinus Torvalds length = -EFAULT; 2861da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 2871da177e4SLinus Torvalds goto out; 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds length = -EINVAL; 2901da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 2911da177e4SLinus Torvalds goto out; 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvalds if (new_value) { 2941da177e4SLinus Torvalds length = selinux_disable(); 2951da177e4SLinus Torvalds if (length < 0) 2961da177e4SLinus Torvalds goto out; 297af601e46SSteve Grubb audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 2984746ec5bSEric Paris "selinux=0 auid=%u ses=%u", 2994746ec5bSEric Paris audit_get_loginuid(current), 3004746ec5bSEric Paris audit_get_sessionid(current)); 3011da177e4SLinus Torvalds } 3021da177e4SLinus Torvalds 3031da177e4SLinus Torvalds length = count; 3041da177e4SLinus Torvalds out: 3051da177e4SLinus Torvalds free_page((unsigned long) page); 3061da177e4SLinus Torvalds return length; 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds #else 3091da177e4SLinus Torvalds #define sel_write_disable NULL 3101da177e4SLinus Torvalds #endif 3111da177e4SLinus Torvalds 3129c2e08c5SArjan van de Ven static const struct file_operations sel_disable_ops = { 3131da177e4SLinus Torvalds .write = sel_write_disable, 31457a62c23SArnd Bergmann .llseek = generic_file_llseek, 3151da177e4SLinus Torvalds }; 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvalds static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, 3181da177e4SLinus Torvalds size_t count, loff_t *ppos) 3191da177e4SLinus Torvalds { 3201da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 3211da177e4SLinus Torvalds ssize_t length; 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); 3241da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 3251da177e4SLinus Torvalds } 3261da177e4SLinus Torvalds 3279c2e08c5SArjan van de Ven static const struct file_operations sel_policyvers_ops = { 3281da177e4SLinus Torvalds .read = sel_read_policyvers, 32957a62c23SArnd Bergmann .llseek = generic_file_llseek, 3301da177e4SLinus Torvalds }; 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* declaration for sel_write_load */ 3331da177e4SLinus Torvalds static int sel_make_bools(void); 334e47c8fc5SChristopher J. PeBenito static int sel_make_classes(void); 3353bb56b25SPaul Moore static int sel_make_policycap(void); 336e47c8fc5SChristopher J. PeBenito 337e47c8fc5SChristopher J. PeBenito /* declaration for sel_make_class_dirs */ 338e47c8fc5SChristopher J. PeBenito static int sel_make_dir(struct inode *dir, struct dentry *dentry, 339e47c8fc5SChristopher J. PeBenito unsigned long *ino); 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds static ssize_t sel_read_mls(struct file *filp, char __user *buf, 3421da177e4SLinus Torvalds size_t count, loff_t *ppos) 3431da177e4SLinus Torvalds { 3441da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 3451da177e4SLinus Torvalds ssize_t length; 3461da177e4SLinus Torvalds 3470719aaf5SGuido Trentalancia length = scnprintf(tmpbuf, TMPBUFLEN, "%d", 3480719aaf5SGuido Trentalancia security_mls_enabled()); 3491da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 3501da177e4SLinus Torvalds } 3511da177e4SLinus Torvalds 3529c2e08c5SArjan van de Ven static const struct file_operations sel_mls_ops = { 3531da177e4SLinus Torvalds .read = sel_read_mls, 35457a62c23SArnd Bergmann .llseek = generic_file_llseek, 3551da177e4SLinus Torvalds }; 3561da177e4SLinus Torvalds 357cee74f47SEric Paris struct policy_load_memory { 358cee74f47SEric Paris size_t len; 359cee74f47SEric Paris void *data; 360cee74f47SEric Paris }; 361cee74f47SEric Paris 362cee74f47SEric Paris static int sel_open_policy(struct inode *inode, struct file *filp) 363cee74f47SEric Paris { 364cee74f47SEric Paris struct policy_load_memory *plm = NULL; 365cee74f47SEric Paris int rc; 366cee74f47SEric Paris 367cee74f47SEric Paris BUG_ON(filp->private_data); 368cee74f47SEric Paris 369cee74f47SEric Paris mutex_lock(&sel_mutex); 370cee74f47SEric Paris 371cee74f47SEric Paris rc = task_has_security(current, SECURITY__READ_POLICY); 372cee74f47SEric Paris if (rc) 373cee74f47SEric Paris goto err; 374cee74f47SEric Paris 375cee74f47SEric Paris rc = -EBUSY; 376cee74f47SEric Paris if (policy_opened) 377cee74f47SEric Paris goto err; 378cee74f47SEric Paris 379cee74f47SEric Paris rc = -ENOMEM; 380cee74f47SEric Paris plm = kzalloc(sizeof(*plm), GFP_KERNEL); 381cee74f47SEric Paris if (!plm) 382cee74f47SEric Paris goto err; 383cee74f47SEric Paris 384cee74f47SEric Paris if (i_size_read(inode) != security_policydb_len()) { 385cee74f47SEric Paris mutex_lock(&inode->i_mutex); 386cee74f47SEric Paris i_size_write(inode, security_policydb_len()); 387cee74f47SEric Paris mutex_unlock(&inode->i_mutex); 388cee74f47SEric Paris } 389cee74f47SEric Paris 390cee74f47SEric Paris rc = security_read_policy(&plm->data, &plm->len); 391cee74f47SEric Paris if (rc) 392cee74f47SEric Paris goto err; 393cee74f47SEric Paris 394cee74f47SEric Paris policy_opened = 1; 395cee74f47SEric Paris 396cee74f47SEric Paris filp->private_data = plm; 397cee74f47SEric Paris 398cee74f47SEric Paris mutex_unlock(&sel_mutex); 399cee74f47SEric Paris 400cee74f47SEric Paris return 0; 401cee74f47SEric Paris err: 402cee74f47SEric Paris mutex_unlock(&sel_mutex); 403cee74f47SEric Paris 404cee74f47SEric Paris if (plm) 405cee74f47SEric Paris vfree(plm->data); 406cee74f47SEric Paris kfree(plm); 407cee74f47SEric Paris return rc; 408cee74f47SEric Paris } 409cee74f47SEric Paris 410cee74f47SEric Paris static int sel_release_policy(struct inode *inode, struct file *filp) 411cee74f47SEric Paris { 412cee74f47SEric Paris struct policy_load_memory *plm = filp->private_data; 413cee74f47SEric Paris 414cee74f47SEric Paris BUG_ON(!plm); 415cee74f47SEric Paris 416cee74f47SEric Paris policy_opened = 0; 417cee74f47SEric Paris 418cee74f47SEric Paris vfree(plm->data); 419cee74f47SEric Paris kfree(plm); 420cee74f47SEric Paris 421cee74f47SEric Paris return 0; 422cee74f47SEric Paris } 423cee74f47SEric Paris 424cee74f47SEric Paris static ssize_t sel_read_policy(struct file *filp, char __user *buf, 425cee74f47SEric Paris size_t count, loff_t *ppos) 426cee74f47SEric Paris { 427cee74f47SEric Paris struct policy_load_memory *plm = filp->private_data; 428cee74f47SEric Paris int ret; 429cee74f47SEric Paris 430cee74f47SEric Paris mutex_lock(&sel_mutex); 431cee74f47SEric Paris 432cee74f47SEric Paris ret = task_has_security(current, SECURITY__READ_POLICY); 433cee74f47SEric Paris if (ret) 434cee74f47SEric Paris goto out; 435cee74f47SEric Paris 436cee74f47SEric Paris ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); 437cee74f47SEric Paris out: 438cee74f47SEric Paris mutex_unlock(&sel_mutex); 439cee74f47SEric Paris return ret; 440cee74f47SEric Paris } 441cee74f47SEric Paris 442cee74f47SEric Paris static const struct file_operations sel_policy_ops = { 443cee74f47SEric Paris .open = sel_open_policy, 444cee74f47SEric Paris .read = sel_read_policy, 445cee74f47SEric Paris .release = sel_release_policy, 446cee74f47SEric Paris }; 447cee74f47SEric Paris 4481da177e4SLinus Torvalds static ssize_t sel_write_load(struct file *file, const char __user *buf, 4491da177e4SLinus Torvalds size_t count, loff_t *ppos) 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds { 4521da177e4SLinus Torvalds int ret; 4531da177e4SLinus Torvalds ssize_t length; 4541da177e4SLinus Torvalds void *data = NULL; 4551da177e4SLinus Torvalds 456bb003079SIngo Molnar mutex_lock(&sel_mutex); 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds length = task_has_security(current, SECURITY__LOAD_POLICY); 4591da177e4SLinus Torvalds if (length) 4601da177e4SLinus Torvalds goto out; 4611da177e4SLinus Torvalds 4621da177e4SLinus Torvalds if (*ppos != 0) { 4631da177e4SLinus Torvalds /* No partial writes. */ 4641da177e4SLinus Torvalds length = -EINVAL; 4651da177e4SLinus Torvalds goto out; 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds 468bfd51626SDavi Arnaut if ((count > 64 * 1024 * 1024) 4691da177e4SLinus Torvalds || (data = vmalloc(count)) == NULL) { 4701da177e4SLinus Torvalds length = -ENOMEM; 4711da177e4SLinus Torvalds goto out; 4721da177e4SLinus Torvalds } 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds length = -EFAULT; 4751da177e4SLinus Torvalds if (copy_from_user(data, buf, count) != 0) 4761da177e4SLinus Torvalds goto out; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds length = security_load_policy(data, count); 4791da177e4SLinus Torvalds if (length) 4801da177e4SLinus Torvalds goto out; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds ret = sel_make_bools(); 483e47c8fc5SChristopher J. PeBenito if (ret) { 484e47c8fc5SChristopher J. PeBenito length = ret; 485e47c8fc5SChristopher J. PeBenito goto out1; 486e47c8fc5SChristopher J. PeBenito } 487e47c8fc5SChristopher J. PeBenito 488e47c8fc5SChristopher J. PeBenito ret = sel_make_classes(); 4893bb56b25SPaul Moore if (ret) { 4903bb56b25SPaul Moore length = ret; 4913bb56b25SPaul Moore goto out1; 4923bb56b25SPaul Moore } 4933bb56b25SPaul Moore 4943bb56b25SPaul Moore ret = sel_make_policycap(); 4951da177e4SLinus Torvalds if (ret) 4961da177e4SLinus Torvalds length = ret; 4971da177e4SLinus Torvalds else 4981da177e4SLinus Torvalds length = count; 499e47c8fc5SChristopher J. PeBenito 500e47c8fc5SChristopher J. PeBenito out1: 501af601e46SSteve Grubb audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, 5024746ec5bSEric Paris "policy loaded auid=%u ses=%u", 5034746ec5bSEric Paris audit_get_loginuid(current), 5044746ec5bSEric Paris audit_get_sessionid(current)); 5051da177e4SLinus Torvalds out: 506bb003079SIngo Molnar mutex_unlock(&sel_mutex); 5071da177e4SLinus Torvalds vfree(data); 5081da177e4SLinus Torvalds return length; 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds 5119c2e08c5SArjan van de Ven static const struct file_operations sel_load_ops = { 5121da177e4SLinus Torvalds .write = sel_write_load, 51357a62c23SArnd Bergmann .llseek = generic_file_llseek, 5141da177e4SLinus Torvalds }; 5151da177e4SLinus Torvalds 516ce9982d0SStephen Smalley static ssize_t sel_write_context(struct file *file, char *buf, size_t size) 5171da177e4SLinus Torvalds { 518ce9982d0SStephen Smalley char *canon; 519ce9982d0SStephen Smalley u32 sid, len; 5201da177e4SLinus Torvalds ssize_t length; 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds length = task_has_security(current, SECURITY__CHECK_CONTEXT); 5231da177e4SLinus Torvalds if (length) 5241da177e4SLinus Torvalds return length; 5251da177e4SLinus Torvalds 526ce9982d0SStephen Smalley length = security_context_to_sid(buf, size, &sid); 5271da177e4SLinus Torvalds if (length < 0) 528ce9982d0SStephen Smalley return length; 5291da177e4SLinus Torvalds 530ce9982d0SStephen Smalley length = security_sid_to_context(sid, &canon, &len); 531ce9982d0SStephen Smalley if (length < 0) 532ce9982d0SStephen Smalley return length; 533ce9982d0SStephen Smalley 534ce9982d0SStephen Smalley if (len > SIMPLE_TRANSACTION_LIMIT) { 535744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 536744ba35eSEric Paris "payload max\n", __func__, len); 537ce9982d0SStephen Smalley length = -ERANGE; 538ce9982d0SStephen Smalley goto out; 539ce9982d0SStephen Smalley } 540ce9982d0SStephen Smalley 541ce9982d0SStephen Smalley memcpy(buf, canon, len); 542ce9982d0SStephen Smalley length = len; 5431da177e4SLinus Torvalds out: 544ce9982d0SStephen Smalley kfree(canon); 5451da177e4SLinus Torvalds return length; 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, 5491da177e4SLinus Torvalds size_t count, loff_t *ppos) 5501da177e4SLinus Torvalds { 5511da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 5521da177e4SLinus Torvalds ssize_t length; 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); 5551da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 5561da177e4SLinus Torvalds } 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, 5591da177e4SLinus Torvalds size_t count, loff_t *ppos) 5601da177e4SLinus Torvalds { 5611da177e4SLinus Torvalds char *page; 5621da177e4SLinus Torvalds ssize_t length; 5631da177e4SLinus Torvalds unsigned int new_value; 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETCHECKREQPROT); 5661da177e4SLinus Torvalds if (length) 5671da177e4SLinus Torvalds return length; 5681da177e4SLinus Torvalds 569bfd51626SDavi Arnaut if (count >= PAGE_SIZE) 5701da177e4SLinus Torvalds return -ENOMEM; 5711da177e4SLinus Torvalds if (*ppos != 0) { 5721da177e4SLinus Torvalds /* No partial writes. */ 5731da177e4SLinus Torvalds return -EINVAL; 5741da177e4SLinus Torvalds } 5751da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 5761da177e4SLinus Torvalds if (!page) 5771da177e4SLinus Torvalds return -ENOMEM; 5781da177e4SLinus Torvalds length = -EFAULT; 5791da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 5801da177e4SLinus Torvalds goto out; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds length = -EINVAL; 5831da177e4SLinus Torvalds if (sscanf(page, "%u", &new_value) != 1) 5841da177e4SLinus Torvalds goto out; 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds selinux_checkreqprot = new_value ? 1 : 0; 5871da177e4SLinus Torvalds length = count; 5881da177e4SLinus Torvalds out: 5891da177e4SLinus Torvalds free_page((unsigned long) page); 5901da177e4SLinus Torvalds return length; 5911da177e4SLinus Torvalds } 5929c2e08c5SArjan van de Ven static const struct file_operations sel_checkreqprot_ops = { 5931da177e4SLinus Torvalds .read = sel_read_checkreqprot, 5941da177e4SLinus Torvalds .write = sel_write_checkreqprot, 59557a62c23SArnd Bergmann .llseek = generic_file_llseek, 5961da177e4SLinus Torvalds }; 5971da177e4SLinus Torvalds 5981da177e4SLinus Torvalds /* 5991da177e4SLinus Torvalds * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c 6001da177e4SLinus Torvalds */ 6011da177e4SLinus Torvalds static ssize_t sel_write_access(struct file *file, char *buf, size_t size); 6021da177e4SLinus Torvalds static ssize_t sel_write_create(struct file *file, char *buf, size_t size); 6031da177e4SLinus Torvalds static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); 6041da177e4SLinus Torvalds static ssize_t sel_write_user(struct file *file, char *buf, size_t size); 6051da177e4SLinus Torvalds static ssize_t sel_write_member(struct file *file, char *buf, size_t size); 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds static ssize_t (*write_op[])(struct file *, char *, size_t) = { 6081da177e4SLinus Torvalds [SEL_ACCESS] = sel_write_access, 6091da177e4SLinus Torvalds [SEL_CREATE] = sel_write_create, 6101da177e4SLinus Torvalds [SEL_RELABEL] = sel_write_relabel, 6111da177e4SLinus Torvalds [SEL_USER] = sel_write_user, 6121da177e4SLinus Torvalds [SEL_MEMBER] = sel_write_member, 613ce9982d0SStephen Smalley [SEL_CONTEXT] = sel_write_context, 6141da177e4SLinus Torvalds }; 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 6171da177e4SLinus Torvalds { 6183d5ff529SJosef Sipek ino_t ino = file->f_path.dentry->d_inode->i_ino; 6191da177e4SLinus Torvalds char *data; 6201da177e4SLinus Torvalds ssize_t rv; 6211da177e4SLinus Torvalds 6226e20a64aSNicolas Kaiser if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 6231da177e4SLinus Torvalds return -EINVAL; 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds data = simple_transaction_get(file, buf, size); 6261da177e4SLinus Torvalds if (IS_ERR(data)) 6271da177e4SLinus Torvalds return PTR_ERR(data); 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds rv = write_op[ino](file, data, size); 6301da177e4SLinus Torvalds if (rv > 0) { 6311da177e4SLinus Torvalds simple_transaction_set(file, rv); 6321da177e4SLinus Torvalds rv = size; 6331da177e4SLinus Torvalds } 6341da177e4SLinus Torvalds return rv; 6351da177e4SLinus Torvalds } 6361da177e4SLinus Torvalds 6379c2e08c5SArjan van de Ven static const struct file_operations transaction_ops = { 6381da177e4SLinus Torvalds .write = selinux_transaction_write, 6391da177e4SLinus Torvalds .read = simple_transaction_read, 6401da177e4SLinus Torvalds .release = simple_transaction_release, 64157a62c23SArnd Bergmann .llseek = generic_file_llseek, 6421da177e4SLinus Torvalds }; 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvalds /* 6451da177e4SLinus Torvalds * payload - write methods 6461da177e4SLinus Torvalds * If the method has a response, the response should be put in buf, 6471da177e4SLinus Torvalds * and the length returned. Otherwise return 0 or and -error. 6481da177e4SLinus Torvalds */ 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvalds static ssize_t sel_write_access(struct file *file, char *buf, size_t size) 6511da177e4SLinus Torvalds { 6521da177e4SLinus Torvalds char *scon, *tcon; 6531da177e4SLinus Torvalds u32 ssid, tsid; 6541da177e4SLinus Torvalds u16 tclass; 6551da177e4SLinus Torvalds struct av_decision avd; 6561da177e4SLinus Torvalds ssize_t length; 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_AV); 6591da177e4SLinus Torvalds if (length) 6601da177e4SLinus Torvalds return length; 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds length = -ENOMEM; 66389d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 6641da177e4SLinus Torvalds if (!scon) 6651da177e4SLinus Torvalds return length; 6661da177e4SLinus Torvalds 66789d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 6681da177e4SLinus Torvalds if (!tcon) 6691da177e4SLinus Torvalds goto out; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds length = -EINVAL; 67219439d05SStephen Smalley if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 6731da177e4SLinus Torvalds goto out2; 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); 6761da177e4SLinus Torvalds if (length < 0) 6771da177e4SLinus Torvalds goto out2; 6781da177e4SLinus Torvalds length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); 6791da177e4SLinus Torvalds if (length < 0) 6801da177e4SLinus Torvalds goto out2; 6811da177e4SLinus Torvalds 68219439d05SStephen Smalley security_compute_av_user(ssid, tsid, tclass, &avd); 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, 6858a6f83afSKaiGai Kohei "%x %x %x %x %u %x", 686f1c6381aSEric Paris avd.allowed, 0xffffffff, 6871da177e4SLinus Torvalds avd.auditallow, avd.auditdeny, 6888a6f83afSKaiGai Kohei avd.seqno, avd.flags); 6891da177e4SLinus Torvalds out2: 6901da177e4SLinus Torvalds kfree(tcon); 6911da177e4SLinus Torvalds out: 6921da177e4SLinus Torvalds kfree(scon); 6931da177e4SLinus Torvalds return length; 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 6971da177e4SLinus Torvalds { 6981da177e4SLinus Torvalds char *scon, *tcon; 6991da177e4SLinus Torvalds u32 ssid, tsid, newsid; 7001da177e4SLinus Torvalds u16 tclass; 7011da177e4SLinus Torvalds ssize_t length; 7021da177e4SLinus Torvalds char *newcon; 7031da177e4SLinus Torvalds u32 len; 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_CREATE); 7061da177e4SLinus Torvalds if (length) 7071da177e4SLinus Torvalds return length; 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds length = -ENOMEM; 71089d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 7111da177e4SLinus Torvalds if (!scon) 7121da177e4SLinus Torvalds return length; 7131da177e4SLinus Torvalds 71489d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 7151da177e4SLinus Torvalds if (!tcon) 7161da177e4SLinus Torvalds goto out; 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds length = -EINVAL; 7191da177e4SLinus Torvalds if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 7201da177e4SLinus Torvalds goto out2; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); 7231da177e4SLinus Torvalds if (length < 0) 7241da177e4SLinus Torvalds goto out2; 7251da177e4SLinus Torvalds length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); 7261da177e4SLinus Torvalds if (length < 0) 7271da177e4SLinus Torvalds goto out2; 7281da177e4SLinus Torvalds 729c6d3aaa4SStephen Smalley length = security_transition_sid_user(ssid, tsid, tclass, &newsid); 7301da177e4SLinus Torvalds if (length < 0) 7311da177e4SLinus Torvalds goto out2; 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvalds length = security_sid_to_context(newsid, &newcon, &len); 7341da177e4SLinus Torvalds if (length < 0) 7351da177e4SLinus Torvalds goto out2; 7361da177e4SLinus Torvalds 7371da177e4SLinus Torvalds if (len > SIMPLE_TRANSACTION_LIMIT) { 738744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 739744ba35eSEric Paris "payload max\n", __func__, len); 7401da177e4SLinus Torvalds length = -ERANGE; 7411da177e4SLinus Torvalds goto out3; 7421da177e4SLinus Torvalds } 7431da177e4SLinus Torvalds 7441da177e4SLinus Torvalds memcpy(buf, newcon, len); 7451da177e4SLinus Torvalds length = len; 7461da177e4SLinus Torvalds out3: 7471da177e4SLinus Torvalds kfree(newcon); 7481da177e4SLinus Torvalds out2: 7491da177e4SLinus Torvalds kfree(tcon); 7501da177e4SLinus Torvalds out: 7511da177e4SLinus Torvalds kfree(scon); 7521da177e4SLinus Torvalds return length; 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) 7561da177e4SLinus Torvalds { 7571da177e4SLinus Torvalds char *scon, *tcon; 7581da177e4SLinus Torvalds u32 ssid, tsid, newsid; 7591da177e4SLinus Torvalds u16 tclass; 7601da177e4SLinus Torvalds ssize_t length; 7611da177e4SLinus Torvalds char *newcon; 7621da177e4SLinus Torvalds u32 len; 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_RELABEL); 7651da177e4SLinus Torvalds if (length) 7661da177e4SLinus Torvalds return length; 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds length = -ENOMEM; 76989d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 7701da177e4SLinus Torvalds if (!scon) 7711da177e4SLinus Torvalds return length; 7721da177e4SLinus Torvalds 77389d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 7741da177e4SLinus Torvalds if (!tcon) 7751da177e4SLinus Torvalds goto out; 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds length = -EINVAL; 7781da177e4SLinus Torvalds if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 7791da177e4SLinus Torvalds goto out2; 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); 7821da177e4SLinus Torvalds if (length < 0) 7831da177e4SLinus Torvalds goto out2; 7841da177e4SLinus Torvalds length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); 7851da177e4SLinus Torvalds if (length < 0) 7861da177e4SLinus Torvalds goto out2; 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvalds length = security_change_sid(ssid, tsid, tclass, &newsid); 7891da177e4SLinus Torvalds if (length < 0) 7901da177e4SLinus Torvalds goto out2; 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvalds length = security_sid_to_context(newsid, &newcon, &len); 7931da177e4SLinus Torvalds if (length < 0) 7941da177e4SLinus Torvalds goto out2; 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds if (len > SIMPLE_TRANSACTION_LIMIT) { 7971da177e4SLinus Torvalds length = -ERANGE; 7981da177e4SLinus Torvalds goto out3; 7991da177e4SLinus Torvalds } 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvalds memcpy(buf, newcon, len); 8021da177e4SLinus Torvalds length = len; 8031da177e4SLinus Torvalds out3: 8041da177e4SLinus Torvalds kfree(newcon); 8051da177e4SLinus Torvalds out2: 8061da177e4SLinus Torvalds kfree(tcon); 8071da177e4SLinus Torvalds out: 8081da177e4SLinus Torvalds kfree(scon); 8091da177e4SLinus Torvalds return length; 8101da177e4SLinus Torvalds } 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds static ssize_t sel_write_user(struct file *file, char *buf, size_t size) 8131da177e4SLinus Torvalds { 8141da177e4SLinus Torvalds char *con, *user, *ptr; 8151da177e4SLinus Torvalds u32 sid, *sids; 8161da177e4SLinus Torvalds ssize_t length; 8171da177e4SLinus Torvalds char *newcon; 8181da177e4SLinus Torvalds int i, rc; 8191da177e4SLinus Torvalds u32 len, nsids; 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_USER); 8221da177e4SLinus Torvalds if (length) 8231da177e4SLinus Torvalds return length; 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds length = -ENOMEM; 82689d155efSJames Morris con = kzalloc(size + 1, GFP_KERNEL); 8271da177e4SLinus Torvalds if (!con) 8281da177e4SLinus Torvalds return length; 8291da177e4SLinus Torvalds 83089d155efSJames Morris user = kzalloc(size + 1, GFP_KERNEL); 8311da177e4SLinus Torvalds if (!user) 8321da177e4SLinus Torvalds goto out; 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds length = -EINVAL; 8351da177e4SLinus Torvalds if (sscanf(buf, "%s %s", con, user) != 2) 8361da177e4SLinus Torvalds goto out2; 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds length = security_context_to_sid(con, strlen(con) + 1, &sid); 8391da177e4SLinus Torvalds if (length < 0) 8401da177e4SLinus Torvalds goto out2; 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds length = security_get_user_sids(sid, user, &sids, &nsids); 8431da177e4SLinus Torvalds if (length < 0) 8441da177e4SLinus Torvalds goto out2; 8451da177e4SLinus Torvalds 8461da177e4SLinus Torvalds length = sprintf(buf, "%u", nsids) + 1; 8471da177e4SLinus Torvalds ptr = buf + length; 8481da177e4SLinus Torvalds for (i = 0; i < nsids; i++) { 8491da177e4SLinus Torvalds rc = security_sid_to_context(sids[i], &newcon, &len); 8501da177e4SLinus Torvalds if (rc) { 8511da177e4SLinus Torvalds length = rc; 8521da177e4SLinus Torvalds goto out3; 8531da177e4SLinus Torvalds } 8541da177e4SLinus Torvalds if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { 8551da177e4SLinus Torvalds kfree(newcon); 8561da177e4SLinus Torvalds length = -ERANGE; 8571da177e4SLinus Torvalds goto out3; 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds memcpy(ptr, newcon, len); 8601da177e4SLinus Torvalds kfree(newcon); 8611da177e4SLinus Torvalds ptr += len; 8621da177e4SLinus Torvalds length += len; 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds out3: 8651da177e4SLinus Torvalds kfree(sids); 8661da177e4SLinus Torvalds out2: 8671da177e4SLinus Torvalds kfree(user); 8681da177e4SLinus Torvalds out: 8691da177e4SLinus Torvalds kfree(con); 8701da177e4SLinus Torvalds return length; 8711da177e4SLinus Torvalds } 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds static ssize_t sel_write_member(struct file *file, char *buf, size_t size) 8741da177e4SLinus Torvalds { 8751da177e4SLinus Torvalds char *scon, *tcon; 8761da177e4SLinus Torvalds u32 ssid, tsid, newsid; 8771da177e4SLinus Torvalds u16 tclass; 8781da177e4SLinus Torvalds ssize_t length; 8791da177e4SLinus Torvalds char *newcon; 8801da177e4SLinus Torvalds u32 len; 8811da177e4SLinus Torvalds 8821da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_MEMBER); 8831da177e4SLinus Torvalds if (length) 8841da177e4SLinus Torvalds return length; 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds length = -ENOMEM; 88789d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 8881da177e4SLinus Torvalds if (!scon) 8891da177e4SLinus Torvalds return length; 8901da177e4SLinus Torvalds 89189d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 8921da177e4SLinus Torvalds if (!tcon) 8931da177e4SLinus Torvalds goto out; 8941da177e4SLinus Torvalds 8951da177e4SLinus Torvalds length = -EINVAL; 8961da177e4SLinus Torvalds if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 8971da177e4SLinus Torvalds goto out2; 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); 9001da177e4SLinus Torvalds if (length < 0) 9011da177e4SLinus Torvalds goto out2; 9021da177e4SLinus Torvalds length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); 9031da177e4SLinus Torvalds if (length < 0) 9041da177e4SLinus Torvalds goto out2; 9051da177e4SLinus Torvalds 9061da177e4SLinus Torvalds length = security_member_sid(ssid, tsid, tclass, &newsid); 9071da177e4SLinus Torvalds if (length < 0) 9081da177e4SLinus Torvalds goto out2; 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds length = security_sid_to_context(newsid, &newcon, &len); 9111da177e4SLinus Torvalds if (length < 0) 9121da177e4SLinus Torvalds goto out2; 9131da177e4SLinus Torvalds 9141da177e4SLinus Torvalds if (len > SIMPLE_TRANSACTION_LIMIT) { 915744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 916744ba35eSEric Paris "payload max\n", __func__, len); 9171da177e4SLinus Torvalds length = -ERANGE; 9181da177e4SLinus Torvalds goto out3; 9191da177e4SLinus Torvalds } 9201da177e4SLinus Torvalds 9211da177e4SLinus Torvalds memcpy(buf, newcon, len); 9221da177e4SLinus Torvalds length = len; 9231da177e4SLinus Torvalds out3: 9241da177e4SLinus Torvalds kfree(newcon); 9251da177e4SLinus Torvalds out2: 9261da177e4SLinus Torvalds kfree(tcon); 9271da177e4SLinus Torvalds out: 9281da177e4SLinus Torvalds kfree(scon); 9291da177e4SLinus Torvalds return length; 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds static struct inode *sel_make_inode(struct super_block *sb, int mode) 9331da177e4SLinus Torvalds { 9341da177e4SLinus Torvalds struct inode *ret = new_inode(sb); 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds if (ret) { 9371da177e4SLinus Torvalds ret->i_mode = mode; 9381da177e4SLinus Torvalds ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 9391da177e4SLinus Torvalds } 9401da177e4SLinus Torvalds return ret; 9411da177e4SLinus Torvalds } 9421da177e4SLinus Torvalds 9431da177e4SLinus Torvalds static ssize_t sel_read_bool(struct file *filep, char __user *buf, 9441da177e4SLinus Torvalds size_t count, loff_t *ppos) 9451da177e4SLinus Torvalds { 9461da177e4SLinus Torvalds char *page = NULL; 9471da177e4SLinus Torvalds ssize_t length; 9481da177e4SLinus Torvalds ssize_t ret; 9491da177e4SLinus Torvalds int cur_enforcing; 950d313f948SStephen Smalley struct inode *inode = filep->f_path.dentry->d_inode; 951d313f948SStephen Smalley unsigned index = inode->i_ino & SEL_INO_MASK; 952d313f948SStephen Smalley const char *name = filep->f_path.dentry->d_name.name; 9531da177e4SLinus Torvalds 954bb003079SIngo Molnar mutex_lock(&sel_mutex); 9551da177e4SLinus Torvalds 956d313f948SStephen Smalley if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 957d313f948SStephen Smalley ret = -EINVAL; 958d313f948SStephen Smalley goto out; 959d313f948SStephen Smalley } 9601da177e4SLinus Torvalds 9611872981bSEric Paris page = (char *)get_zeroed_page(GFP_KERNEL); 9621872981bSEric Paris if (!page) { 9631da177e4SLinus Torvalds ret = -ENOMEM; 9641da177e4SLinus Torvalds goto out; 9651da177e4SLinus Torvalds } 9661da177e4SLinus Torvalds 967d313f948SStephen Smalley cur_enforcing = security_get_bool_value(index); 9681da177e4SLinus Torvalds if (cur_enforcing < 0) { 9691da177e4SLinus Torvalds ret = cur_enforcing; 9701da177e4SLinus Torvalds goto out; 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, 973d313f948SStephen Smalley bool_pending_values[index]); 97468bdcf28SStephen Smalley ret = simple_read_from_buffer(buf, count, ppos, page, length); 9751da177e4SLinus Torvalds out: 976bb003079SIngo Molnar mutex_unlock(&sel_mutex); 9771da177e4SLinus Torvalds if (page) 9781da177e4SLinus Torvalds free_page((unsigned long)page); 9791da177e4SLinus Torvalds return ret; 9801da177e4SLinus Torvalds } 9811da177e4SLinus Torvalds 9821da177e4SLinus Torvalds static ssize_t sel_write_bool(struct file *filep, const char __user *buf, 9831da177e4SLinus Torvalds size_t count, loff_t *ppos) 9841da177e4SLinus Torvalds { 9851da177e4SLinus Torvalds char *page = NULL; 986d313f948SStephen Smalley ssize_t length; 9871da177e4SLinus Torvalds int new_value; 988d313f948SStephen Smalley struct inode *inode = filep->f_path.dentry->d_inode; 989d313f948SStephen Smalley unsigned index = inode->i_ino & SEL_INO_MASK; 990d313f948SStephen Smalley const char *name = filep->f_path.dentry->d_name.name; 9911da177e4SLinus Torvalds 992bb003079SIngo Molnar mutex_lock(&sel_mutex); 9931da177e4SLinus Torvalds 9941da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETBOOL); 9951da177e4SLinus Torvalds if (length) 9961da177e4SLinus Torvalds goto out; 9971da177e4SLinus Torvalds 998d313f948SStephen Smalley if (index >= bool_num || strcmp(name, bool_pending_names[index])) { 999d313f948SStephen Smalley length = -EINVAL; 1000d313f948SStephen Smalley goto out; 1001d313f948SStephen Smalley } 1002d313f948SStephen Smalley 1003bfd51626SDavi Arnaut if (count >= PAGE_SIZE) { 10041da177e4SLinus Torvalds length = -ENOMEM; 10051da177e4SLinus Torvalds goto out; 10061da177e4SLinus Torvalds } 1007d313f948SStephen Smalley 10081da177e4SLinus Torvalds if (*ppos != 0) { 10091da177e4SLinus Torvalds /* No partial writes. */ 1010d313f948SStephen Smalley length = -EINVAL; 10111da177e4SLinus Torvalds goto out; 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 10141da177e4SLinus Torvalds if (!page) { 10151da177e4SLinus Torvalds length = -ENOMEM; 10161da177e4SLinus Torvalds goto out; 10171da177e4SLinus Torvalds } 10181da177e4SLinus Torvalds 1019d313f948SStephen Smalley length = -EFAULT; 10201da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 10211da177e4SLinus Torvalds goto out; 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds length = -EINVAL; 10241da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 10251da177e4SLinus Torvalds goto out; 10261da177e4SLinus Torvalds 10271da177e4SLinus Torvalds if (new_value) 10281da177e4SLinus Torvalds new_value = 1; 10291da177e4SLinus Torvalds 1030d313f948SStephen Smalley bool_pending_values[index] = new_value; 10311da177e4SLinus Torvalds length = count; 10321da177e4SLinus Torvalds 10331da177e4SLinus Torvalds out: 1034bb003079SIngo Molnar mutex_unlock(&sel_mutex); 10351da177e4SLinus Torvalds if (page) 10361da177e4SLinus Torvalds free_page((unsigned long) page); 10371da177e4SLinus Torvalds return length; 10381da177e4SLinus Torvalds } 10391da177e4SLinus Torvalds 10409c2e08c5SArjan van de Ven static const struct file_operations sel_bool_ops = { 10411da177e4SLinus Torvalds .read = sel_read_bool, 10421da177e4SLinus Torvalds .write = sel_write_bool, 104357a62c23SArnd Bergmann .llseek = generic_file_llseek, 10441da177e4SLinus Torvalds }; 10451da177e4SLinus Torvalds 10461da177e4SLinus Torvalds static ssize_t sel_commit_bools_write(struct file *filep, 10471da177e4SLinus Torvalds const char __user *buf, 10481da177e4SLinus Torvalds size_t count, loff_t *ppos) 10491da177e4SLinus Torvalds { 10501da177e4SLinus Torvalds char *page = NULL; 1051d313f948SStephen Smalley ssize_t length; 10521da177e4SLinus Torvalds int new_value; 10531da177e4SLinus Torvalds 1054bb003079SIngo Molnar mutex_lock(&sel_mutex); 10551da177e4SLinus Torvalds 10561da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETBOOL); 10571da177e4SLinus Torvalds if (length) 10581da177e4SLinus Torvalds goto out; 10591da177e4SLinus Torvalds 1060bfd51626SDavi Arnaut if (count >= PAGE_SIZE) { 10611da177e4SLinus Torvalds length = -ENOMEM; 10621da177e4SLinus Torvalds goto out; 10631da177e4SLinus Torvalds } 10641da177e4SLinus Torvalds if (*ppos != 0) { 10651da177e4SLinus Torvalds /* No partial writes. */ 10661da177e4SLinus Torvalds goto out; 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 10691da177e4SLinus Torvalds if (!page) { 10701da177e4SLinus Torvalds length = -ENOMEM; 10711da177e4SLinus Torvalds goto out; 10721da177e4SLinus Torvalds } 10731da177e4SLinus Torvalds 1074d313f948SStephen Smalley length = -EFAULT; 10751da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 10761da177e4SLinus Torvalds goto out; 10771da177e4SLinus Torvalds 10781da177e4SLinus Torvalds length = -EINVAL; 10791da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 10801da177e4SLinus Torvalds goto out; 10811da177e4SLinus Torvalds 10821872981bSEric Paris if (new_value && bool_pending_values) 10831da177e4SLinus Torvalds security_set_bools(bool_num, bool_pending_values); 10841da177e4SLinus Torvalds 10851da177e4SLinus Torvalds length = count; 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds out: 1088bb003079SIngo Molnar mutex_unlock(&sel_mutex); 10891da177e4SLinus Torvalds if (page) 10901da177e4SLinus Torvalds free_page((unsigned long) page); 10911da177e4SLinus Torvalds return length; 10921da177e4SLinus Torvalds } 10931da177e4SLinus Torvalds 10949c2e08c5SArjan van de Ven static const struct file_operations sel_commit_bools_ops = { 10951da177e4SLinus Torvalds .write = sel_commit_bools_write, 109657a62c23SArnd Bergmann .llseek = generic_file_llseek, 10971da177e4SLinus Torvalds }; 10981da177e4SLinus Torvalds 10990c92d7c7SChristopher J. PeBenito static void sel_remove_entries(struct dentry *de) 11001da177e4SLinus Torvalds { 11010955dc03SStephen Smalley struct list_head *node; 11021da177e4SLinus Torvalds 11031da177e4SLinus Torvalds spin_lock(&dcache_lock); 11041da177e4SLinus Torvalds node = de->d_subdirs.next; 11051da177e4SLinus Torvalds while (node != &de->d_subdirs) { 11065160ee6fSEric Dumazet struct dentry *d = list_entry(node, struct dentry, d_u.d_child); 11071da177e4SLinus Torvalds list_del_init(node); 11081da177e4SLinus Torvalds 11091da177e4SLinus Torvalds if (d->d_inode) { 11101da177e4SLinus Torvalds d = dget_locked(d); 11111da177e4SLinus Torvalds spin_unlock(&dcache_lock); 11121da177e4SLinus Torvalds d_delete(d); 11131da177e4SLinus Torvalds simple_unlink(de->d_inode, d); 11141da177e4SLinus Torvalds dput(d); 11151da177e4SLinus Torvalds spin_lock(&dcache_lock); 11161da177e4SLinus Torvalds } 11171da177e4SLinus Torvalds node = de->d_subdirs.next; 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds spin_unlock(&dcache_lock); 11211da177e4SLinus Torvalds } 11221da177e4SLinus Torvalds 11231da177e4SLinus Torvalds #define BOOL_DIR_NAME "booleans" 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds static int sel_make_bools(void) 11261da177e4SLinus Torvalds { 11271da177e4SLinus Torvalds int i, ret = 0; 11281da177e4SLinus Torvalds ssize_t len; 11291da177e4SLinus Torvalds struct dentry *dentry = NULL; 11301da177e4SLinus Torvalds struct dentry *dir = bool_dir; 11311da177e4SLinus Torvalds struct inode *inode = NULL; 11321da177e4SLinus Torvalds struct inode_security_struct *isec; 11331da177e4SLinus Torvalds char **names = NULL, *page; 11341da177e4SLinus Torvalds int num; 11351da177e4SLinus Torvalds int *values = NULL; 11361da177e4SLinus Torvalds u32 sid; 11371da177e4SLinus Torvalds 11381da177e4SLinus Torvalds /* remove any existing files */ 11398007f102SXiaotian Feng for (i = 0; i < bool_num; i++) 11408007f102SXiaotian Feng kfree(bool_pending_names[i]); 1141d313f948SStephen Smalley kfree(bool_pending_names); 11421da177e4SLinus Torvalds kfree(bool_pending_values); 1143d313f948SStephen Smalley bool_pending_names = NULL; 114420c19e41SDavi Arnaut bool_pending_values = NULL; 11451da177e4SLinus Torvalds 11460c92d7c7SChristopher J. PeBenito sel_remove_entries(dir); 11471da177e4SLinus Torvalds 11481872981bSEric Paris page = (char *)get_zeroed_page(GFP_KERNEL); 11491872981bSEric Paris if (!page) 11501da177e4SLinus Torvalds return -ENOMEM; 11511da177e4SLinus Torvalds 11521da177e4SLinus Torvalds ret = security_get_bools(&num, &names, &values); 11531da177e4SLinus Torvalds if (ret != 0) 11541da177e4SLinus Torvalds goto out; 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds for (i = 0; i < num; i++) { 11571da177e4SLinus Torvalds dentry = d_alloc_name(dir, names[i]); 11581da177e4SLinus Torvalds if (!dentry) { 11591da177e4SLinus Torvalds ret = -ENOMEM; 11601da177e4SLinus Torvalds goto err; 11611da177e4SLinus Torvalds } 11621da177e4SLinus Torvalds inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); 11631da177e4SLinus Torvalds if (!inode) { 11641da177e4SLinus Torvalds ret = -ENOMEM; 11651da177e4SLinus Torvalds goto err; 11661da177e4SLinus Torvalds } 11671da177e4SLinus Torvalds 11681da177e4SLinus Torvalds len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); 11691da177e4SLinus Torvalds if (len < 0) { 11701da177e4SLinus Torvalds ret = -EINVAL; 11711da177e4SLinus Torvalds goto err; 11721da177e4SLinus Torvalds } else if (len >= PAGE_SIZE) { 11731da177e4SLinus Torvalds ret = -ENAMETOOLONG; 11741da177e4SLinus Torvalds goto err; 11751da177e4SLinus Torvalds } 11761da177e4SLinus Torvalds isec = (struct inode_security_struct *)inode->i_security; 11771872981bSEric Paris ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); 11781872981bSEric Paris if (ret) 11791da177e4SLinus Torvalds goto err; 11801da177e4SLinus Torvalds isec->sid = sid; 11811da177e4SLinus Torvalds isec->initialized = 1; 11821da177e4SLinus Torvalds inode->i_fop = &sel_bool_ops; 1183bce34bc0SJames Carter inode->i_ino = i|SEL_BOOL_INO_OFFSET; 11841da177e4SLinus Torvalds d_add(dentry, inode); 11851da177e4SLinus Torvalds } 11861da177e4SLinus Torvalds bool_num = num; 1187d313f948SStephen Smalley bool_pending_names = names; 11881da177e4SLinus Torvalds bool_pending_values = values; 11891da177e4SLinus Torvalds out: 11901da177e4SLinus Torvalds free_page((unsigned long)page); 1191d313f948SStephen Smalley return ret; 1192d313f948SStephen Smalley err: 11931da177e4SLinus Torvalds if (names) { 11949a5f04bfSJesper Juhl for (i = 0; i < num; i++) 11951da177e4SLinus Torvalds kfree(names[i]); 11961da177e4SLinus Torvalds kfree(names); 11971da177e4SLinus Torvalds } 119820c19e41SDavi Arnaut kfree(values); 11990c92d7c7SChristopher J. PeBenito sel_remove_entries(dir); 12001da177e4SLinus Torvalds ret = -ENOMEM; 12011da177e4SLinus Torvalds goto out; 12021da177e4SLinus Torvalds } 12031da177e4SLinus Torvalds 12041da177e4SLinus Torvalds #define NULL_FILE_NAME "null" 12051da177e4SLinus Torvalds 12061872981bSEric Paris struct dentry *selinux_null; 12071da177e4SLinus Torvalds 12081da177e4SLinus Torvalds static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, 12091da177e4SLinus Torvalds size_t count, loff_t *ppos) 12101da177e4SLinus Torvalds { 12111da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 12121da177e4SLinus Torvalds ssize_t length; 12131da177e4SLinus Torvalds 12141da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); 12151da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 12161da177e4SLinus Torvalds } 12171da177e4SLinus Torvalds 12181da177e4SLinus Torvalds static ssize_t sel_write_avc_cache_threshold(struct file *file, 12191da177e4SLinus Torvalds const char __user *buf, 12201da177e4SLinus Torvalds size_t count, loff_t *ppos) 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds { 12231da177e4SLinus Torvalds char *page; 12241da177e4SLinus Torvalds ssize_t ret; 12251da177e4SLinus Torvalds int new_value; 12261da177e4SLinus Torvalds 1227bfd51626SDavi Arnaut if (count >= PAGE_SIZE) { 12281da177e4SLinus Torvalds ret = -ENOMEM; 12291da177e4SLinus Torvalds goto out; 12301da177e4SLinus Torvalds } 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds if (*ppos != 0) { 12331da177e4SLinus Torvalds /* No partial writes. */ 12341da177e4SLinus Torvalds ret = -EINVAL; 12351da177e4SLinus Torvalds goto out; 12361da177e4SLinus Torvalds } 12371da177e4SLinus Torvalds 12381da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 12391da177e4SLinus Torvalds if (!page) { 12401da177e4SLinus Torvalds ret = -ENOMEM; 12411da177e4SLinus Torvalds goto out; 12421da177e4SLinus Torvalds } 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) { 12451da177e4SLinus Torvalds ret = -EFAULT; 12461da177e4SLinus Torvalds goto out_free; 12471da177e4SLinus Torvalds } 12481da177e4SLinus Torvalds 12491da177e4SLinus Torvalds if (sscanf(page, "%u", &new_value) != 1) { 12501da177e4SLinus Torvalds ret = -EINVAL; 12511da177e4SLinus Torvalds goto out; 12521da177e4SLinus Torvalds } 12531da177e4SLinus Torvalds 12541da177e4SLinus Torvalds if (new_value != avc_cache_threshold) { 12551da177e4SLinus Torvalds ret = task_has_security(current, SECURITY__SETSECPARAM); 12561da177e4SLinus Torvalds if (ret) 12571da177e4SLinus Torvalds goto out_free; 12581da177e4SLinus Torvalds avc_cache_threshold = new_value; 12591da177e4SLinus Torvalds } 12601da177e4SLinus Torvalds ret = count; 12611da177e4SLinus Torvalds out_free: 12621da177e4SLinus Torvalds free_page((unsigned long)page); 12631da177e4SLinus Torvalds out: 12641da177e4SLinus Torvalds return ret; 12651da177e4SLinus Torvalds } 12661da177e4SLinus Torvalds 12671da177e4SLinus Torvalds static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, 12681da177e4SLinus Torvalds size_t count, loff_t *ppos) 12691da177e4SLinus Torvalds { 12701da177e4SLinus Torvalds char *page; 12711da177e4SLinus Torvalds ssize_t ret = 0; 12721da177e4SLinus Torvalds 12731da177e4SLinus Torvalds page = (char *)__get_free_page(GFP_KERNEL); 12741da177e4SLinus Torvalds if (!page) { 12751da177e4SLinus Torvalds ret = -ENOMEM; 12761da177e4SLinus Torvalds goto out; 12771da177e4SLinus Torvalds } 12781da177e4SLinus Torvalds ret = avc_get_hash_stats(page); 12791da177e4SLinus Torvalds if (ret >= 0) 12801da177e4SLinus Torvalds ret = simple_read_from_buffer(buf, count, ppos, page, ret); 12811da177e4SLinus Torvalds free_page((unsigned long)page); 12821da177e4SLinus Torvalds out: 12831da177e4SLinus Torvalds return ret; 12841da177e4SLinus Torvalds } 12851da177e4SLinus Torvalds 12869c2e08c5SArjan van de Ven static const struct file_operations sel_avc_cache_threshold_ops = { 12871da177e4SLinus Torvalds .read = sel_read_avc_cache_threshold, 12881da177e4SLinus Torvalds .write = sel_write_avc_cache_threshold, 128957a62c23SArnd Bergmann .llseek = generic_file_llseek, 12901da177e4SLinus Torvalds }; 12911da177e4SLinus Torvalds 12929c2e08c5SArjan van de Ven static const struct file_operations sel_avc_hash_stats_ops = { 12931da177e4SLinus Torvalds .read = sel_read_avc_hash_stats, 129457a62c23SArnd Bergmann .llseek = generic_file_llseek, 12951da177e4SLinus Torvalds }; 12961da177e4SLinus Torvalds 12971da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 12981da177e4SLinus Torvalds static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) 12991da177e4SLinus Torvalds { 13001da177e4SLinus Torvalds int cpu; 13011da177e4SLinus Torvalds 13024f4b6c1aSRusty Russell for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { 13031da177e4SLinus Torvalds if (!cpu_possible(cpu)) 13041da177e4SLinus Torvalds continue; 13051da177e4SLinus Torvalds *idx = cpu + 1; 13061da177e4SLinus Torvalds return &per_cpu(avc_cache_stats, cpu); 13071da177e4SLinus Torvalds } 13081da177e4SLinus Torvalds return NULL; 13091da177e4SLinus Torvalds } 13101da177e4SLinus Torvalds 13111da177e4SLinus Torvalds static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) 13121da177e4SLinus Torvalds { 13131da177e4SLinus Torvalds loff_t n = *pos - 1; 13141da177e4SLinus Torvalds 13151da177e4SLinus Torvalds if (*pos == 0) 13161da177e4SLinus Torvalds return SEQ_START_TOKEN; 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds return sel_avc_get_stat_idx(&n); 13191da177e4SLinus Torvalds } 13201da177e4SLinus Torvalds 13211da177e4SLinus Torvalds static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) 13221da177e4SLinus Torvalds { 13231da177e4SLinus Torvalds return sel_avc_get_stat_idx(pos); 13241da177e4SLinus Torvalds } 13251da177e4SLinus Torvalds 13261da177e4SLinus Torvalds static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) 13271da177e4SLinus Torvalds { 13281da177e4SLinus Torvalds struct avc_cache_stats *st = v; 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds if (v == SEQ_START_TOKEN) 13311da177e4SLinus Torvalds seq_printf(seq, "lookups hits misses allocations reclaims " 13321da177e4SLinus Torvalds "frees\n"); 13331da177e4SLinus Torvalds else 13341da177e4SLinus Torvalds seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, 13351da177e4SLinus Torvalds st->hits, st->misses, st->allocations, 13361da177e4SLinus Torvalds st->reclaims, st->frees); 13371da177e4SLinus Torvalds return 0; 13381da177e4SLinus Torvalds } 13391da177e4SLinus Torvalds 13401da177e4SLinus Torvalds static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) 13411da177e4SLinus Torvalds { } 13421da177e4SLinus Torvalds 13431996a109SJan Engelhardt static const struct seq_operations sel_avc_cache_stats_seq_ops = { 13441da177e4SLinus Torvalds .start = sel_avc_stats_seq_start, 13451da177e4SLinus Torvalds .next = sel_avc_stats_seq_next, 13461da177e4SLinus Torvalds .show = sel_avc_stats_seq_show, 13471da177e4SLinus Torvalds .stop = sel_avc_stats_seq_stop, 13481da177e4SLinus Torvalds }; 13491da177e4SLinus Torvalds 13501da177e4SLinus Torvalds static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) 13511da177e4SLinus Torvalds { 13521da177e4SLinus Torvalds return seq_open(file, &sel_avc_cache_stats_seq_ops); 13531da177e4SLinus Torvalds } 13541da177e4SLinus Torvalds 13559c2e08c5SArjan van de Ven static const struct file_operations sel_avc_cache_stats_ops = { 13561da177e4SLinus Torvalds .open = sel_open_avc_cache_stats, 13571da177e4SLinus Torvalds .read = seq_read, 13581da177e4SLinus Torvalds .llseek = seq_lseek, 13591da177e4SLinus Torvalds .release = seq_release, 13601da177e4SLinus Torvalds }; 13611da177e4SLinus Torvalds #endif 13621da177e4SLinus Torvalds 13631da177e4SLinus Torvalds static int sel_make_avc_files(struct dentry *dir) 13641da177e4SLinus Torvalds { 13651da177e4SLinus Torvalds int i, ret = 0; 13661da177e4SLinus Torvalds static struct tree_descr files[] = { 13671da177e4SLinus Torvalds { "cache_threshold", 13681da177e4SLinus Torvalds &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, 13691da177e4SLinus Torvalds { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, 13701da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 13711da177e4SLinus Torvalds { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, 13721da177e4SLinus Torvalds #endif 13731da177e4SLinus Torvalds }; 13741da177e4SLinus Torvalds 13756e20a64aSNicolas Kaiser for (i = 0; i < ARRAY_SIZE(files); i++) { 13761da177e4SLinus Torvalds struct inode *inode; 13771da177e4SLinus Torvalds struct dentry *dentry; 13781da177e4SLinus Torvalds 13791da177e4SLinus Torvalds dentry = d_alloc_name(dir, files[i].name); 13801da177e4SLinus Torvalds if (!dentry) { 13811da177e4SLinus Torvalds ret = -ENOMEM; 1382d6aafa65SJames Morris goto out; 13831da177e4SLinus Torvalds } 13841da177e4SLinus Torvalds 13851da177e4SLinus Torvalds inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); 13861da177e4SLinus Torvalds if (!inode) { 13871da177e4SLinus Torvalds ret = -ENOMEM; 1388d6aafa65SJames Morris goto out; 13891da177e4SLinus Torvalds } 13901da177e4SLinus Torvalds inode->i_fop = files[i].ops; 13916174eafcSJames Carter inode->i_ino = ++sel_last_ino; 13921da177e4SLinus Torvalds d_add(dentry, inode); 13931da177e4SLinus Torvalds } 13941da177e4SLinus Torvalds out: 13951da177e4SLinus Torvalds return ret; 13961da177e4SLinus Torvalds } 13971da177e4SLinus Torvalds 1398f0ee2e46SJames Carter static ssize_t sel_read_initcon(struct file *file, char __user *buf, 1399f0ee2e46SJames Carter size_t count, loff_t *ppos) 1400f0ee2e46SJames Carter { 1401f0ee2e46SJames Carter struct inode *inode; 1402f0ee2e46SJames Carter char *con; 1403f0ee2e46SJames Carter u32 sid, len; 1404f0ee2e46SJames Carter ssize_t ret; 1405f0ee2e46SJames Carter 1406f0ee2e46SJames Carter inode = file->f_path.dentry->d_inode; 1407f0ee2e46SJames Carter sid = inode->i_ino&SEL_INO_MASK; 1408f0ee2e46SJames Carter ret = security_sid_to_context(sid, &con, &len); 1409f0ee2e46SJames Carter if (ret < 0) 1410f0ee2e46SJames Carter return ret; 1411f0ee2e46SJames Carter 1412f0ee2e46SJames Carter ret = simple_read_from_buffer(buf, count, ppos, con, len); 1413f0ee2e46SJames Carter kfree(con); 1414f0ee2e46SJames Carter return ret; 1415f0ee2e46SJames Carter } 1416f0ee2e46SJames Carter 1417f0ee2e46SJames Carter static const struct file_operations sel_initcon_ops = { 1418f0ee2e46SJames Carter .read = sel_read_initcon, 141957a62c23SArnd Bergmann .llseek = generic_file_llseek, 1420f0ee2e46SJames Carter }; 1421f0ee2e46SJames Carter 1422f0ee2e46SJames Carter static int sel_make_initcon_files(struct dentry *dir) 1423f0ee2e46SJames Carter { 1424f0ee2e46SJames Carter int i, ret = 0; 1425f0ee2e46SJames Carter 1426f0ee2e46SJames Carter for (i = 1; i <= SECINITSID_NUM; i++) { 1427f0ee2e46SJames Carter struct inode *inode; 1428f0ee2e46SJames Carter struct dentry *dentry; 1429f0ee2e46SJames Carter dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); 1430f0ee2e46SJames Carter if (!dentry) { 1431f0ee2e46SJames Carter ret = -ENOMEM; 1432f0ee2e46SJames Carter goto out; 1433f0ee2e46SJames Carter } 1434f0ee2e46SJames Carter 1435f0ee2e46SJames Carter inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1436f0ee2e46SJames Carter if (!inode) { 1437f0ee2e46SJames Carter ret = -ENOMEM; 1438f0ee2e46SJames Carter goto out; 1439f0ee2e46SJames Carter } 1440f0ee2e46SJames Carter inode->i_fop = &sel_initcon_ops; 1441f0ee2e46SJames Carter inode->i_ino = i|SEL_INITCON_INO_OFFSET; 1442f0ee2e46SJames Carter d_add(dentry, inode); 1443f0ee2e46SJames Carter } 1444f0ee2e46SJames Carter out: 1445f0ee2e46SJames Carter return ret; 1446f0ee2e46SJames Carter } 1447f0ee2e46SJames Carter 1448e47c8fc5SChristopher J. PeBenito static inline unsigned int sel_div(unsigned long a, unsigned long b) 1449e47c8fc5SChristopher J. PeBenito { 1450e47c8fc5SChristopher J. PeBenito return a / b - (a % b < 0); 1451e47c8fc5SChristopher J. PeBenito } 1452e47c8fc5SChristopher J. PeBenito 1453e47c8fc5SChristopher J. PeBenito static inline unsigned long sel_class_to_ino(u16 class) 1454e47c8fc5SChristopher J. PeBenito { 1455e47c8fc5SChristopher J. PeBenito return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; 1456e47c8fc5SChristopher J. PeBenito } 1457e47c8fc5SChristopher J. PeBenito 1458e47c8fc5SChristopher J. PeBenito static inline u16 sel_ino_to_class(unsigned long ino) 1459e47c8fc5SChristopher J. PeBenito { 1460e47c8fc5SChristopher J. PeBenito return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); 1461e47c8fc5SChristopher J. PeBenito } 1462e47c8fc5SChristopher J. PeBenito 1463e47c8fc5SChristopher J. PeBenito static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) 1464e47c8fc5SChristopher J. PeBenito { 1465e47c8fc5SChristopher J. PeBenito return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; 1466e47c8fc5SChristopher J. PeBenito } 1467e47c8fc5SChristopher J. PeBenito 1468e47c8fc5SChristopher J. PeBenito static inline u32 sel_ino_to_perm(unsigned long ino) 1469e47c8fc5SChristopher J. PeBenito { 1470e47c8fc5SChristopher J. PeBenito return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); 1471e47c8fc5SChristopher J. PeBenito } 1472e47c8fc5SChristopher J. PeBenito 1473e47c8fc5SChristopher J. PeBenito static ssize_t sel_read_class(struct file *file, char __user *buf, 1474e47c8fc5SChristopher J. PeBenito size_t count, loff_t *ppos) 1475e47c8fc5SChristopher J. PeBenito { 1476e47c8fc5SChristopher J. PeBenito ssize_t rc, len; 1477e47c8fc5SChristopher J. PeBenito char *page; 1478e47c8fc5SChristopher J. PeBenito unsigned long ino = file->f_path.dentry->d_inode->i_ino; 1479e47c8fc5SChristopher J. PeBenito 1480e47c8fc5SChristopher J. PeBenito page = (char *)__get_free_page(GFP_KERNEL); 1481e47c8fc5SChristopher J. PeBenito if (!page) { 1482e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1483e47c8fc5SChristopher J. PeBenito goto out; 1484e47c8fc5SChristopher J. PeBenito } 1485e47c8fc5SChristopher J. PeBenito 1486e47c8fc5SChristopher J. PeBenito len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); 1487e47c8fc5SChristopher J. PeBenito rc = simple_read_from_buffer(buf, count, ppos, page, len); 1488e47c8fc5SChristopher J. PeBenito free_page((unsigned long)page); 1489e47c8fc5SChristopher J. PeBenito out: 1490e47c8fc5SChristopher J. PeBenito return rc; 1491e47c8fc5SChristopher J. PeBenito } 1492e47c8fc5SChristopher J. PeBenito 1493e47c8fc5SChristopher J. PeBenito static const struct file_operations sel_class_ops = { 1494e47c8fc5SChristopher J. PeBenito .read = sel_read_class, 149557a62c23SArnd Bergmann .llseek = generic_file_llseek, 1496e47c8fc5SChristopher J. PeBenito }; 1497e47c8fc5SChristopher J. PeBenito 1498e47c8fc5SChristopher J. PeBenito static ssize_t sel_read_perm(struct file *file, char __user *buf, 1499e47c8fc5SChristopher J. PeBenito size_t count, loff_t *ppos) 1500e47c8fc5SChristopher J. PeBenito { 1501e47c8fc5SChristopher J. PeBenito ssize_t rc, len; 1502e47c8fc5SChristopher J. PeBenito char *page; 1503e47c8fc5SChristopher J. PeBenito unsigned long ino = file->f_path.dentry->d_inode->i_ino; 1504e47c8fc5SChristopher J. PeBenito 1505e47c8fc5SChristopher J. PeBenito page = (char *)__get_free_page(GFP_KERNEL); 1506e47c8fc5SChristopher J. PeBenito if (!page) { 1507e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1508e47c8fc5SChristopher J. PeBenito goto out; 1509e47c8fc5SChristopher J. PeBenito } 1510e47c8fc5SChristopher J. PeBenito 1511e47c8fc5SChristopher J. PeBenito len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); 1512e47c8fc5SChristopher J. PeBenito rc = simple_read_from_buffer(buf, count, ppos, page, len); 1513e47c8fc5SChristopher J. PeBenito free_page((unsigned long)page); 1514e47c8fc5SChristopher J. PeBenito out: 1515e47c8fc5SChristopher J. PeBenito return rc; 1516e47c8fc5SChristopher J. PeBenito } 1517e47c8fc5SChristopher J. PeBenito 1518e47c8fc5SChristopher J. PeBenito static const struct file_operations sel_perm_ops = { 1519e47c8fc5SChristopher J. PeBenito .read = sel_read_perm, 152057a62c23SArnd Bergmann .llseek = generic_file_llseek, 1521e47c8fc5SChristopher J. PeBenito }; 1522e47c8fc5SChristopher J. PeBenito 15233bb56b25SPaul Moore static ssize_t sel_read_policycap(struct file *file, char __user *buf, 15243bb56b25SPaul Moore size_t count, loff_t *ppos) 15253bb56b25SPaul Moore { 15263bb56b25SPaul Moore int value; 15273bb56b25SPaul Moore char tmpbuf[TMPBUFLEN]; 15283bb56b25SPaul Moore ssize_t length; 15293bb56b25SPaul Moore unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; 15303bb56b25SPaul Moore 15313bb56b25SPaul Moore value = security_policycap_supported(i_ino & SEL_INO_MASK); 15323bb56b25SPaul Moore length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); 15333bb56b25SPaul Moore 15343bb56b25SPaul Moore return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 15353bb56b25SPaul Moore } 15363bb56b25SPaul Moore 15373bb56b25SPaul Moore static const struct file_operations sel_policycap_ops = { 15383bb56b25SPaul Moore .read = sel_read_policycap, 153957a62c23SArnd Bergmann .llseek = generic_file_llseek, 15403bb56b25SPaul Moore }; 15413bb56b25SPaul Moore 1542e47c8fc5SChristopher J. PeBenito static int sel_make_perm_files(char *objclass, int classvalue, 1543e47c8fc5SChristopher J. PeBenito struct dentry *dir) 1544e47c8fc5SChristopher J. PeBenito { 1545e47c8fc5SChristopher J. PeBenito int i, rc = 0, nperms; 1546e47c8fc5SChristopher J. PeBenito char **perms; 1547e47c8fc5SChristopher J. PeBenito 1548e47c8fc5SChristopher J. PeBenito rc = security_get_permissions(objclass, &perms, &nperms); 1549e47c8fc5SChristopher J. PeBenito if (rc) 1550e47c8fc5SChristopher J. PeBenito goto out; 1551e47c8fc5SChristopher J. PeBenito 1552e47c8fc5SChristopher J. PeBenito for (i = 0; i < nperms; i++) { 1553e47c8fc5SChristopher J. PeBenito struct inode *inode; 1554e47c8fc5SChristopher J. PeBenito struct dentry *dentry; 1555e47c8fc5SChristopher J. PeBenito 1556e47c8fc5SChristopher J. PeBenito dentry = d_alloc_name(dir, perms[i]); 1557e47c8fc5SChristopher J. PeBenito if (!dentry) { 1558e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1559e47c8fc5SChristopher J. PeBenito goto out1; 1560e47c8fc5SChristopher J. PeBenito } 1561e47c8fc5SChristopher J. PeBenito 1562e47c8fc5SChristopher J. PeBenito inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1563e47c8fc5SChristopher J. PeBenito if (!inode) { 1564e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1565e47c8fc5SChristopher J. PeBenito goto out1; 1566e47c8fc5SChristopher J. PeBenito } 1567e47c8fc5SChristopher J. PeBenito inode->i_fop = &sel_perm_ops; 1568e47c8fc5SChristopher J. PeBenito /* i+1 since perm values are 1-indexed */ 1569e47c8fc5SChristopher J. PeBenito inode->i_ino = sel_perm_to_ino(classvalue, i + 1); 1570e47c8fc5SChristopher J. PeBenito d_add(dentry, inode); 1571e47c8fc5SChristopher J. PeBenito } 1572e47c8fc5SChristopher J. PeBenito 1573e47c8fc5SChristopher J. PeBenito out1: 1574e47c8fc5SChristopher J. PeBenito for (i = 0; i < nperms; i++) 1575e47c8fc5SChristopher J. PeBenito kfree(perms[i]); 1576e47c8fc5SChristopher J. PeBenito kfree(perms); 1577e47c8fc5SChristopher J. PeBenito out: 1578e47c8fc5SChristopher J. PeBenito return rc; 1579e47c8fc5SChristopher J. PeBenito } 1580e47c8fc5SChristopher J. PeBenito 1581e47c8fc5SChristopher J. PeBenito static int sel_make_class_dir_entries(char *classname, int index, 1582e47c8fc5SChristopher J. PeBenito struct dentry *dir) 1583e47c8fc5SChristopher J. PeBenito { 1584e47c8fc5SChristopher J. PeBenito struct dentry *dentry = NULL; 1585e47c8fc5SChristopher J. PeBenito struct inode *inode = NULL; 1586e47c8fc5SChristopher J. PeBenito int rc; 1587e47c8fc5SChristopher J. PeBenito 1588e47c8fc5SChristopher J. PeBenito dentry = d_alloc_name(dir, "index"); 1589e47c8fc5SChristopher J. PeBenito if (!dentry) { 1590e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1591e47c8fc5SChristopher J. PeBenito goto out; 1592e47c8fc5SChristopher J. PeBenito } 1593e47c8fc5SChristopher J. PeBenito 1594e47c8fc5SChristopher J. PeBenito inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1595e47c8fc5SChristopher J. PeBenito if (!inode) { 1596e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1597e47c8fc5SChristopher J. PeBenito goto out; 1598e47c8fc5SChristopher J. PeBenito } 1599e47c8fc5SChristopher J. PeBenito 1600e47c8fc5SChristopher J. PeBenito inode->i_fop = &sel_class_ops; 1601e47c8fc5SChristopher J. PeBenito inode->i_ino = sel_class_to_ino(index); 1602e47c8fc5SChristopher J. PeBenito d_add(dentry, inode); 1603e47c8fc5SChristopher J. PeBenito 1604e47c8fc5SChristopher J. PeBenito dentry = d_alloc_name(dir, "perms"); 1605e47c8fc5SChristopher J. PeBenito if (!dentry) { 1606e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1607e47c8fc5SChristopher J. PeBenito goto out; 1608e47c8fc5SChristopher J. PeBenito } 1609e47c8fc5SChristopher J. PeBenito 1610e47c8fc5SChristopher J. PeBenito rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); 1611e47c8fc5SChristopher J. PeBenito if (rc) 1612e47c8fc5SChristopher J. PeBenito goto out; 1613e47c8fc5SChristopher J. PeBenito 1614e47c8fc5SChristopher J. PeBenito rc = sel_make_perm_files(classname, index, dentry); 1615e47c8fc5SChristopher J. PeBenito 1616e47c8fc5SChristopher J. PeBenito out: 1617e47c8fc5SChristopher J. PeBenito return rc; 1618e47c8fc5SChristopher J. PeBenito } 1619e47c8fc5SChristopher J. PeBenito 1620e47c8fc5SChristopher J. PeBenito static void sel_remove_classes(void) 1621e47c8fc5SChristopher J. PeBenito { 1622e47c8fc5SChristopher J. PeBenito struct list_head *class_node; 1623e47c8fc5SChristopher J. PeBenito 1624e47c8fc5SChristopher J. PeBenito list_for_each(class_node, &class_dir->d_subdirs) { 1625e47c8fc5SChristopher J. PeBenito struct dentry *class_subdir = list_entry(class_node, 1626e47c8fc5SChristopher J. PeBenito struct dentry, d_u.d_child); 1627e47c8fc5SChristopher J. PeBenito struct list_head *class_subdir_node; 1628e47c8fc5SChristopher J. PeBenito 1629e47c8fc5SChristopher J. PeBenito list_for_each(class_subdir_node, &class_subdir->d_subdirs) { 1630e47c8fc5SChristopher J. PeBenito struct dentry *d = list_entry(class_subdir_node, 1631e47c8fc5SChristopher J. PeBenito struct dentry, d_u.d_child); 1632e47c8fc5SChristopher J. PeBenito 1633e47c8fc5SChristopher J. PeBenito if (d->d_inode) 1634e47c8fc5SChristopher J. PeBenito if (d->d_inode->i_mode & S_IFDIR) 1635e47c8fc5SChristopher J. PeBenito sel_remove_entries(d); 1636e47c8fc5SChristopher J. PeBenito } 1637e47c8fc5SChristopher J. PeBenito 1638e47c8fc5SChristopher J. PeBenito sel_remove_entries(class_subdir); 1639e47c8fc5SChristopher J. PeBenito } 1640e47c8fc5SChristopher J. PeBenito 1641e47c8fc5SChristopher J. PeBenito sel_remove_entries(class_dir); 1642e47c8fc5SChristopher J. PeBenito } 1643e47c8fc5SChristopher J. PeBenito 1644e47c8fc5SChristopher J. PeBenito static int sel_make_classes(void) 1645e47c8fc5SChristopher J. PeBenito { 1646e47c8fc5SChristopher J. PeBenito int rc = 0, nclasses, i; 1647e47c8fc5SChristopher J. PeBenito char **classes; 1648e47c8fc5SChristopher J. PeBenito 1649e47c8fc5SChristopher J. PeBenito /* delete any existing entries */ 1650e47c8fc5SChristopher J. PeBenito sel_remove_classes(); 1651e47c8fc5SChristopher J. PeBenito 1652e47c8fc5SChristopher J. PeBenito rc = security_get_classes(&classes, &nclasses); 1653e47c8fc5SChristopher J. PeBenito if (rc < 0) 1654e47c8fc5SChristopher J. PeBenito goto out; 1655e47c8fc5SChristopher J. PeBenito 1656e47c8fc5SChristopher J. PeBenito /* +2 since classes are 1-indexed */ 1657e47c8fc5SChristopher J. PeBenito last_class_ino = sel_class_to_ino(nclasses + 2); 1658e47c8fc5SChristopher J. PeBenito 1659e47c8fc5SChristopher J. PeBenito for (i = 0; i < nclasses; i++) { 1660e47c8fc5SChristopher J. PeBenito struct dentry *class_name_dir; 1661e47c8fc5SChristopher J. PeBenito 1662e47c8fc5SChristopher J. PeBenito class_name_dir = d_alloc_name(class_dir, classes[i]); 1663e47c8fc5SChristopher J. PeBenito if (!class_name_dir) { 1664e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1665e47c8fc5SChristopher J. PeBenito goto out1; 1666e47c8fc5SChristopher J. PeBenito } 1667e47c8fc5SChristopher J. PeBenito 1668e47c8fc5SChristopher J. PeBenito rc = sel_make_dir(class_dir->d_inode, class_name_dir, 1669e47c8fc5SChristopher J. PeBenito &last_class_ino); 1670e47c8fc5SChristopher J. PeBenito if (rc) 1671e47c8fc5SChristopher J. PeBenito goto out1; 1672e47c8fc5SChristopher J. PeBenito 1673e47c8fc5SChristopher J. PeBenito /* i+1 since class values are 1-indexed */ 1674e47c8fc5SChristopher J. PeBenito rc = sel_make_class_dir_entries(classes[i], i + 1, 1675e47c8fc5SChristopher J. PeBenito class_name_dir); 1676e47c8fc5SChristopher J. PeBenito if (rc) 1677e47c8fc5SChristopher J. PeBenito goto out1; 1678e47c8fc5SChristopher J. PeBenito } 1679e47c8fc5SChristopher J. PeBenito 1680e47c8fc5SChristopher J. PeBenito out1: 1681e47c8fc5SChristopher J. PeBenito for (i = 0; i < nclasses; i++) 1682e47c8fc5SChristopher J. PeBenito kfree(classes[i]); 1683e47c8fc5SChristopher J. PeBenito kfree(classes); 1684e47c8fc5SChristopher J. PeBenito out: 1685e47c8fc5SChristopher J. PeBenito return rc; 1686e47c8fc5SChristopher J. PeBenito } 1687e47c8fc5SChristopher J. PeBenito 16883bb56b25SPaul Moore static int sel_make_policycap(void) 16893bb56b25SPaul Moore { 16903bb56b25SPaul Moore unsigned int iter; 16913bb56b25SPaul Moore struct dentry *dentry = NULL; 16923bb56b25SPaul Moore struct inode *inode = NULL; 16933bb56b25SPaul Moore 16943bb56b25SPaul Moore sel_remove_entries(policycap_dir); 16953bb56b25SPaul Moore 16963bb56b25SPaul Moore for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { 16973bb56b25SPaul Moore if (iter < ARRAY_SIZE(policycap_names)) 16983bb56b25SPaul Moore dentry = d_alloc_name(policycap_dir, 16993bb56b25SPaul Moore policycap_names[iter]); 17003bb56b25SPaul Moore else 17013bb56b25SPaul Moore dentry = d_alloc_name(policycap_dir, "unknown"); 17023bb56b25SPaul Moore 17033bb56b25SPaul Moore if (dentry == NULL) 17043bb56b25SPaul Moore return -ENOMEM; 17053bb56b25SPaul Moore 17063bb56b25SPaul Moore inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); 17073bb56b25SPaul Moore if (inode == NULL) 17083bb56b25SPaul Moore return -ENOMEM; 17093bb56b25SPaul Moore 17103bb56b25SPaul Moore inode->i_fop = &sel_policycap_ops; 17113bb56b25SPaul Moore inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; 17123bb56b25SPaul Moore d_add(dentry, inode); 17133bb56b25SPaul Moore } 17143bb56b25SPaul Moore 17153bb56b25SPaul Moore return 0; 17163bb56b25SPaul Moore } 17173bb56b25SPaul Moore 17180dd4ae51SChristopher J. PeBenito static int sel_make_dir(struct inode *dir, struct dentry *dentry, 17190dd4ae51SChristopher J. PeBenito unsigned long *ino) 17201da177e4SLinus Torvalds { 17211da177e4SLinus Torvalds int ret = 0; 17221da177e4SLinus Torvalds struct inode *inode; 17231da177e4SLinus Torvalds 1724edb20fb5SJames Morris inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); 17251da177e4SLinus Torvalds if (!inode) { 17261da177e4SLinus Torvalds ret = -ENOMEM; 17271da177e4SLinus Torvalds goto out; 17281da177e4SLinus Torvalds } 17291da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 17301da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 17310dd4ae51SChristopher J. PeBenito inode->i_ino = ++(*ino); 173240e906f8SJames Morris /* directory inodes start off with i_nlink == 2 (for "." entry) */ 1733d8c76e6fSDave Hansen inc_nlink(inode); 17341da177e4SLinus Torvalds d_add(dentry, inode); 1735edb20fb5SJames Morris /* bump link count on parent directory, too */ 1736d8c76e6fSDave Hansen inc_nlink(dir); 17371da177e4SLinus Torvalds out: 17381da177e4SLinus Torvalds return ret; 17391da177e4SLinus Torvalds } 17401da177e4SLinus Torvalds 17411da177e4SLinus Torvalds static int sel_fill_super(struct super_block *sb, void *data, int silent) 17421da177e4SLinus Torvalds { 17431da177e4SLinus Torvalds int ret; 17441da177e4SLinus Torvalds struct dentry *dentry; 1745edb20fb5SJames Morris struct inode *inode, *root_inode; 17461da177e4SLinus Torvalds struct inode_security_struct *isec; 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds static struct tree_descr selinux_files[] = { 17491da177e4SLinus Torvalds [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, 17501da177e4SLinus Torvalds [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, 1751ce9982d0SStephen Smalley [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, 17521da177e4SLinus Torvalds [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, 17531da177e4SLinus Torvalds [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, 17541da177e4SLinus Torvalds [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, 17551da177e4SLinus Torvalds [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, 17561da177e4SLinus Torvalds [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, 17571da177e4SLinus Torvalds [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, 17581da177e4SLinus Torvalds [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, 17591da177e4SLinus Torvalds [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, 17601da177e4SLinus Torvalds [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, 17611da177e4SLinus Torvalds [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, 17623f12070eSEric Paris [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, 17633f12070eSEric Paris [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, 176411904167SKaiGai Kohei [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, 1765cee74f47SEric Paris [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR}, 17661da177e4SLinus Torvalds /* last one */ {""} 17671da177e4SLinus Torvalds }; 17681da177e4SLinus Torvalds ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); 17691da177e4SLinus Torvalds if (ret) 1770161ce45aSJames Morris goto err; 17711da177e4SLinus Torvalds 1772edb20fb5SJames Morris root_inode = sb->s_root->d_inode; 1773edb20fb5SJames Morris 17741da177e4SLinus Torvalds dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); 1775161ce45aSJames Morris if (!dentry) { 1776161ce45aSJames Morris ret = -ENOMEM; 1777161ce45aSJames Morris goto err; 1778161ce45aSJames Morris } 17791da177e4SLinus Torvalds 17800dd4ae51SChristopher J. PeBenito ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1781cde174a8SJames Morris if (ret) 1782161ce45aSJames Morris goto err; 1783cde174a8SJames Morris 17841da177e4SLinus Torvalds bool_dir = dentry; 17851da177e4SLinus Torvalds 17861da177e4SLinus Torvalds dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); 1787161ce45aSJames Morris if (!dentry) { 1788161ce45aSJames Morris ret = -ENOMEM; 1789161ce45aSJames Morris goto err; 1790161ce45aSJames Morris } 17911da177e4SLinus Torvalds 17921da177e4SLinus Torvalds inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); 1793161ce45aSJames Morris if (!inode) { 1794161ce45aSJames Morris ret = -ENOMEM; 1795161ce45aSJames Morris goto err; 1796161ce45aSJames Morris } 17976174eafcSJames Carter inode->i_ino = ++sel_last_ino; 17981da177e4SLinus Torvalds isec = (struct inode_security_struct *)inode->i_security; 17991da177e4SLinus Torvalds isec->sid = SECINITSID_DEVNULL; 18001da177e4SLinus Torvalds isec->sclass = SECCLASS_CHR_FILE; 18011da177e4SLinus Torvalds isec->initialized = 1; 18021da177e4SLinus Torvalds 18031da177e4SLinus Torvalds init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); 18041da177e4SLinus Torvalds d_add(dentry, inode); 18051da177e4SLinus Torvalds selinux_null = dentry; 18061da177e4SLinus Torvalds 18071da177e4SLinus Torvalds dentry = d_alloc_name(sb->s_root, "avc"); 1808161ce45aSJames Morris if (!dentry) { 1809161ce45aSJames Morris ret = -ENOMEM; 1810161ce45aSJames Morris goto err; 1811161ce45aSJames Morris } 18121da177e4SLinus Torvalds 18130dd4ae51SChristopher J. PeBenito ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 18141da177e4SLinus Torvalds if (ret) 1815161ce45aSJames Morris goto err; 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds ret = sel_make_avc_files(dentry); 18181da177e4SLinus Torvalds if (ret) 1819161ce45aSJames Morris goto err; 1820f0ee2e46SJames Carter 1821f0ee2e46SJames Carter dentry = d_alloc_name(sb->s_root, "initial_contexts"); 1822f0ee2e46SJames Carter if (!dentry) { 1823f0ee2e46SJames Carter ret = -ENOMEM; 1824f0ee2e46SJames Carter goto err; 1825f0ee2e46SJames Carter } 1826f0ee2e46SJames Carter 18270dd4ae51SChristopher J. PeBenito ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1828f0ee2e46SJames Carter if (ret) 1829f0ee2e46SJames Carter goto err; 1830f0ee2e46SJames Carter 1831f0ee2e46SJames Carter ret = sel_make_initcon_files(dentry); 1832f0ee2e46SJames Carter if (ret) 1833f0ee2e46SJames Carter goto err; 1834f0ee2e46SJames Carter 1835e47c8fc5SChristopher J. PeBenito dentry = d_alloc_name(sb->s_root, "class"); 1836e47c8fc5SChristopher J. PeBenito if (!dentry) { 1837e47c8fc5SChristopher J. PeBenito ret = -ENOMEM; 1838e47c8fc5SChristopher J. PeBenito goto err; 1839e47c8fc5SChristopher J. PeBenito } 1840e47c8fc5SChristopher J. PeBenito 1841e47c8fc5SChristopher J. PeBenito ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 1842e47c8fc5SChristopher J. PeBenito if (ret) 1843e47c8fc5SChristopher J. PeBenito goto err; 1844e47c8fc5SChristopher J. PeBenito 1845e47c8fc5SChristopher J. PeBenito class_dir = dentry; 1846e47c8fc5SChristopher J. PeBenito 18473bb56b25SPaul Moore dentry = d_alloc_name(sb->s_root, "policy_capabilities"); 18483bb56b25SPaul Moore if (!dentry) { 18493bb56b25SPaul Moore ret = -ENOMEM; 18503bb56b25SPaul Moore goto err; 18513bb56b25SPaul Moore } 18523bb56b25SPaul Moore 18533bb56b25SPaul Moore ret = sel_make_dir(root_inode, dentry, &sel_last_ino); 18543bb56b25SPaul Moore if (ret) 18553bb56b25SPaul Moore goto err; 18563bb56b25SPaul Moore 18573bb56b25SPaul Moore policycap_dir = dentry; 18583bb56b25SPaul Moore 18591da177e4SLinus Torvalds out: 1860161ce45aSJames Morris return ret; 1861161ce45aSJames Morris err: 1862744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", 1863744ba35eSEric Paris __func__); 1864161ce45aSJames Morris goto out; 18651da177e4SLinus Torvalds } 18661da177e4SLinus Torvalds 1867454e2398SDavid Howells static int sel_get_sb(struct file_system_type *fs_type, 1868454e2398SDavid Howells int flags, const char *dev_name, void *data, 1869454e2398SDavid Howells struct vfsmount *mnt) 18701da177e4SLinus Torvalds { 1871454e2398SDavid Howells return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); 18721da177e4SLinus Torvalds } 18731da177e4SLinus Torvalds 18741da177e4SLinus Torvalds static struct file_system_type sel_fs_type = { 18751da177e4SLinus Torvalds .name = "selinuxfs", 18761da177e4SLinus Torvalds .get_sb = sel_get_sb, 18771da177e4SLinus Torvalds .kill_sb = kill_litter_super, 18781da177e4SLinus Torvalds }; 18791da177e4SLinus Torvalds 18801da177e4SLinus Torvalds struct vfsmount *selinuxfs_mount; 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds static int __init init_sel_fs(void) 18831da177e4SLinus Torvalds { 18841da177e4SLinus Torvalds int err; 18851da177e4SLinus Torvalds 18861da177e4SLinus Torvalds if (!selinux_enabled) 18871da177e4SLinus Torvalds return 0; 18881da177e4SLinus Torvalds err = register_filesystem(&sel_fs_type); 18891da177e4SLinus Torvalds if (!err) { 18901da177e4SLinus Torvalds selinuxfs_mount = kern_mount(&sel_fs_type); 18911da177e4SLinus Torvalds if (IS_ERR(selinuxfs_mount)) { 18921da177e4SLinus Torvalds printk(KERN_ERR "selinuxfs: could not mount!\n"); 18931da177e4SLinus Torvalds err = PTR_ERR(selinuxfs_mount); 18941da177e4SLinus Torvalds selinuxfs_mount = NULL; 18951da177e4SLinus Torvalds } 18961da177e4SLinus Torvalds } 18971da177e4SLinus Torvalds return err; 18981da177e4SLinus Torvalds } 18991da177e4SLinus Torvalds 19001da177e4SLinus Torvalds __initcall(init_sel_fs); 19011da177e4SLinus Torvalds 19021da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_DISABLE 19031da177e4SLinus Torvalds void exit_sel_fs(void) 19041da177e4SLinus Torvalds { 19051da177e4SLinus Torvalds unregister_filesystem(&sel_fs_type); 19061da177e4SLinus Torvalds } 19071da177e4SLinus Torvalds #endif 1908