11da177e4SLinus Torvalds /* Updated: Karl MacMillan <kmacmillan@tresys.com> 21da177e4SLinus Torvalds * 31da177e4SLinus Torvalds * Added conditional policy language extensions 41da177e4SLinus Torvalds * 582c21bfaSPaul Moore * Updated: Hewlett-Packard <paul@paul-moore.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> 317a627e3bSGreg Kroah-Hartman #include <linux/kobject.h> 320f7e4c33SKohei Kaigai #include <linux/ctype.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds /* selinuxfs pseudo filesystem for exporting the security policy API. 351da177e4SLinus Torvalds Based on the proc code and the fs/nfsd/nfsctl.c code. */ 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds #include "flask.h" 381da177e4SLinus Torvalds #include "avc.h" 391da177e4SLinus Torvalds #include "avc_ss.h" 401da177e4SLinus Torvalds #include "security.h" 411da177e4SLinus Torvalds #include "objsec.h" 421da177e4SLinus Torvalds #include "conditional.h" 431da177e4SLinus Torvalds 443bb56b25SPaul Moore /* Policy capability filenames */ 453bb56b25SPaul Moore static char *policycap_names[] = { 46b0c636b9SEric Paris "network_peer_controls", 472be4d74fSChris PeBenito "open_perms", 482be4d74fSChris PeBenito "redhat1", 492be4d74fSChris PeBenito "always_check_network" 503bb56b25SPaul Moore }; 513bb56b25SPaul Moore 521da177e4SLinus Torvalds unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static int __init checkreqprot_setup(char *str) 551da177e4SLinus Torvalds { 56f5269710SEric Paris unsigned long checkreqprot; 5729707b20SJingoo Han if (!kstrtoul(str, 0, &checkreqprot)) 58f5269710SEric Paris selinux_checkreqprot = checkreqprot ? 1 : 0; 591da177e4SLinus Torvalds return 1; 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds __setup("checkreqprot=", checkreqprot_setup); 621da177e4SLinus Torvalds 63bb003079SIngo Molnar static DEFINE_MUTEX(sel_mutex); 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds /* global data for booleans */ 661872981bSEric Paris static struct dentry *bool_dir; 671872981bSEric Paris static int bool_num; 68d313f948SStephen Smalley static char **bool_pending_names; 691872981bSEric Paris static int *bool_pending_values; 701da177e4SLinus Torvalds 71e47c8fc5SChristopher J. PeBenito /* global data for classes */ 721872981bSEric Paris static struct dentry *class_dir; 73e47c8fc5SChristopher J. PeBenito static unsigned long last_class_ino; 74e47c8fc5SChristopher J. PeBenito 75cee74f47SEric Paris static char policy_opened; 76cee74f47SEric Paris 773bb56b25SPaul Moore /* global data for policy capabilities */ 781872981bSEric Paris static struct dentry *policycap_dir; 793bb56b25SPaul Moore 801da177e4SLinus Torvalds /* Check whether a task is allowed to use a security operation. */ 811da177e4SLinus Torvalds static int task_has_security(struct task_struct *tsk, 821da177e4SLinus Torvalds u32 perms) 831da177e4SLinus Torvalds { 84c69e8d9cSDavid Howells const struct task_security_struct *tsec; 85c69e8d9cSDavid Howells u32 sid = 0; 861da177e4SLinus Torvalds 87c69e8d9cSDavid Howells rcu_read_lock(); 88c69e8d9cSDavid Howells tsec = __task_cred(tsk)->security; 89c69e8d9cSDavid Howells if (tsec) 90c69e8d9cSDavid Howells sid = tsec->sid; 91c69e8d9cSDavid Howells rcu_read_unlock(); 921da177e4SLinus Torvalds if (!tsec) 931da177e4SLinus Torvalds return -EACCES; 941da177e4SLinus Torvalds 95c69e8d9cSDavid Howells return avc_has_perm(sid, SECINITSID_SECURITY, 961da177e4SLinus Torvalds SECCLASS_SECURITY, perms, NULL); 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds enum sel_inos { 1001da177e4SLinus Torvalds SEL_ROOT_INO = 2, 1011da177e4SLinus Torvalds SEL_LOAD, /* load policy */ 1021da177e4SLinus Torvalds SEL_ENFORCE, /* get or set enforcing status */ 1031da177e4SLinus Torvalds SEL_CONTEXT, /* validate context */ 1041da177e4SLinus Torvalds SEL_ACCESS, /* compute access decision */ 1051da177e4SLinus Torvalds SEL_CREATE, /* compute create labeling decision */ 1061da177e4SLinus Torvalds SEL_RELABEL, /* compute relabeling decision */ 1071da177e4SLinus Torvalds SEL_USER, /* compute reachable user contexts */ 1081da177e4SLinus Torvalds SEL_POLICYVERS, /* return policy version for this kernel */ 1091da177e4SLinus Torvalds SEL_COMMIT_BOOLS, /* commit new boolean values */ 1101da177e4SLinus Torvalds SEL_MLS, /* return if MLS policy is enabled */ 1111da177e4SLinus Torvalds SEL_DISABLE, /* disable SELinux until next reboot */ 1121da177e4SLinus Torvalds SEL_MEMBER, /* compute polyinstantiation membership decision */ 1131da177e4SLinus Torvalds SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ 1144e5ab4cbSJames Morris SEL_COMPAT_NET, /* whether to use old compat network packet controls */ 1153f12070eSEric Paris SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ 1163f12070eSEric Paris SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ 11711904167SKaiGai Kohei SEL_STATUS, /* export current status using mmap() */ 118cee74f47SEric Paris SEL_POLICY, /* allow userspace to read the in kernel policy */ 119f9df6458SAndrew Perepechko SEL_VALIDATE_TRANS, /* compute validatetrans decision */ 1206174eafcSJames Carter SEL_INO_NEXT, /* The next inode number to use */ 1211da177e4SLinus Torvalds }; 1221da177e4SLinus Torvalds 1236174eafcSJames Carter static unsigned long sel_last_ino = SEL_INO_NEXT - 1; 1246174eafcSJames Carter 125f0ee2e46SJames Carter #define SEL_INITCON_INO_OFFSET 0x01000000 126bce34bc0SJames Carter #define SEL_BOOL_INO_OFFSET 0x02000000 127e47c8fc5SChristopher J. PeBenito #define SEL_CLASS_INO_OFFSET 0x04000000 1283bb56b25SPaul Moore #define SEL_POLICYCAP_INO_OFFSET 0x08000000 129f0ee2e46SJames Carter #define SEL_INO_MASK 0x00ffffff 130f0ee2e46SJames Carter 1311da177e4SLinus Torvalds #define TMPBUFLEN 12 1321da177e4SLinus Torvalds static ssize_t sel_read_enforce(struct file *filp, char __user *buf, 1331da177e4SLinus Torvalds size_t count, loff_t *ppos) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 1361da177e4SLinus Torvalds ssize_t length; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); 1391da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 1431da177e4SLinus Torvalds static ssize_t sel_write_enforce(struct file *file, const char __user *buf, 1441da177e4SLinus Torvalds size_t count, loff_t *ppos) 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds { 147b77a493bSEric Paris char *page = NULL; 1481da177e4SLinus Torvalds ssize_t length; 1491da177e4SLinus Torvalds int new_value; 1501da177e4SLinus Torvalds 151b77a493bSEric Paris length = -ENOMEM; 152bfd51626SDavi Arnaut if (count >= PAGE_SIZE) 153b77a493bSEric Paris goto out; 154b77a493bSEric Paris 1551da177e4SLinus Torvalds /* No partial writes. */ 1566436a123SJoe Perches length = -EINVAL; 157b77a493bSEric Paris if (*ppos != 0) 158b77a493bSEric Paris goto out; 159b77a493bSEric Paris 160b77a493bSEric Paris length = -ENOMEM; 1611da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 1621da177e4SLinus Torvalds if (!page) 163b77a493bSEric Paris goto out; 164b77a493bSEric Paris 1651da177e4SLinus Torvalds length = -EFAULT; 1661da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 1671da177e4SLinus Torvalds goto out; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds length = -EINVAL; 1701da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 1711da177e4SLinus Torvalds goto out; 1721da177e4SLinus Torvalds 1731da177e4SLinus Torvalds if (new_value != selinux_enforcing) { 1741da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETENFORCE); 1751da177e4SLinus Torvalds if (length) 1761da177e4SLinus Torvalds goto out; 177af601e46SSteve Grubb audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 1784746ec5bSEric Paris "enforcing=%d old_enforcing=%d auid=%u ses=%u", 1794746ec5bSEric Paris new_value, selinux_enforcing, 180581abc09SEric W. Biederman from_kuid(&init_user_ns, audit_get_loginuid(current)), 1814746ec5bSEric Paris audit_get_sessionid(current)); 1821da177e4SLinus Torvalds selinux_enforcing = new_value; 1831da177e4SLinus Torvalds if (selinux_enforcing) 1841da177e4SLinus Torvalds avc_ss_reset(0); 1851da177e4SLinus Torvalds selnl_notify_setenforce(selinux_enforcing); 18611904167SKaiGai Kohei selinux_status_update_setenforce(selinux_enforcing); 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds length = count; 1891da177e4SLinus Torvalds out: 1901da177e4SLinus Torvalds free_page((unsigned long) page); 1911da177e4SLinus Torvalds return length; 1921da177e4SLinus Torvalds } 1931da177e4SLinus Torvalds #else 1941da177e4SLinus Torvalds #define sel_write_enforce NULL 1951da177e4SLinus Torvalds #endif 1961da177e4SLinus Torvalds 1979c2e08c5SArjan van de Ven static const struct file_operations sel_enforce_ops = { 1981da177e4SLinus Torvalds .read = sel_read_enforce, 1991da177e4SLinus Torvalds .write = sel_write_enforce, 20057a62c23SArnd Bergmann .llseek = generic_file_llseek, 2011da177e4SLinus Torvalds }; 2021da177e4SLinus Torvalds 2033f12070eSEric Paris static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, 2043f12070eSEric Paris size_t count, loff_t *ppos) 2053f12070eSEric Paris { 2063f12070eSEric Paris char tmpbuf[TMPBUFLEN]; 2073f12070eSEric Paris ssize_t length; 208496ad9aaSAl Viro ino_t ino = file_inode(filp)->i_ino; 2093f12070eSEric Paris int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? 2103f12070eSEric Paris security_get_reject_unknown() : !security_get_allow_unknown(); 2113f12070eSEric Paris 2123f12070eSEric Paris length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); 2133f12070eSEric Paris return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 2143f12070eSEric Paris } 2153f12070eSEric Paris 2163f12070eSEric Paris static const struct file_operations sel_handle_unknown_ops = { 2173f12070eSEric Paris .read = sel_read_handle_unknown, 21857a62c23SArnd Bergmann .llseek = generic_file_llseek, 2193f12070eSEric Paris }; 2203f12070eSEric Paris 22111904167SKaiGai Kohei static int sel_open_handle_status(struct inode *inode, struct file *filp) 22211904167SKaiGai Kohei { 22311904167SKaiGai Kohei struct page *status = selinux_kernel_status_page(); 22411904167SKaiGai Kohei 22511904167SKaiGai Kohei if (!status) 22611904167SKaiGai Kohei return -ENOMEM; 22711904167SKaiGai Kohei 22811904167SKaiGai Kohei filp->private_data = status; 22911904167SKaiGai Kohei 23011904167SKaiGai Kohei return 0; 23111904167SKaiGai Kohei } 23211904167SKaiGai Kohei 23311904167SKaiGai Kohei static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, 23411904167SKaiGai Kohei size_t count, loff_t *ppos) 23511904167SKaiGai Kohei { 23611904167SKaiGai Kohei struct page *status = filp->private_data; 23711904167SKaiGai Kohei 23811904167SKaiGai Kohei BUG_ON(!status); 23911904167SKaiGai Kohei 24011904167SKaiGai Kohei return simple_read_from_buffer(buf, count, ppos, 24111904167SKaiGai Kohei page_address(status), 24211904167SKaiGai Kohei sizeof(struct selinux_kernel_status)); 24311904167SKaiGai Kohei } 24411904167SKaiGai Kohei 24511904167SKaiGai Kohei static int sel_mmap_handle_status(struct file *filp, 24611904167SKaiGai Kohei struct vm_area_struct *vma) 24711904167SKaiGai Kohei { 24811904167SKaiGai Kohei struct page *status = filp->private_data; 24911904167SKaiGai Kohei unsigned long size = vma->vm_end - vma->vm_start; 25011904167SKaiGai Kohei 25111904167SKaiGai Kohei BUG_ON(!status); 25211904167SKaiGai Kohei 25311904167SKaiGai Kohei /* only allows one page from the head */ 25411904167SKaiGai Kohei if (vma->vm_pgoff > 0 || size != PAGE_SIZE) 25511904167SKaiGai Kohei return -EIO; 25611904167SKaiGai Kohei /* disallow writable mapping */ 25711904167SKaiGai Kohei if (vma->vm_flags & VM_WRITE) 25811904167SKaiGai Kohei return -EPERM; 25911904167SKaiGai Kohei /* disallow mprotect() turns it into writable */ 26011904167SKaiGai Kohei vma->vm_flags &= ~VM_MAYWRITE; 26111904167SKaiGai Kohei 26211904167SKaiGai Kohei return remap_pfn_range(vma, vma->vm_start, 26311904167SKaiGai Kohei page_to_pfn(status), 26411904167SKaiGai Kohei size, vma->vm_page_prot); 26511904167SKaiGai Kohei } 26611904167SKaiGai Kohei 26711904167SKaiGai Kohei static const struct file_operations sel_handle_status_ops = { 26811904167SKaiGai Kohei .open = sel_open_handle_status, 26911904167SKaiGai Kohei .read = sel_read_handle_status, 27011904167SKaiGai Kohei .mmap = sel_mmap_handle_status, 27111904167SKaiGai Kohei .llseek = generic_file_llseek, 27211904167SKaiGai Kohei }; 27311904167SKaiGai Kohei 2741da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_DISABLE 2751da177e4SLinus Torvalds static ssize_t sel_write_disable(struct file *file, const char __user *buf, 2761da177e4SLinus Torvalds size_t count, loff_t *ppos) 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvalds { 279b77a493bSEric Paris char *page = NULL; 2801da177e4SLinus Torvalds ssize_t length; 2811da177e4SLinus Torvalds int new_value; 2821da177e4SLinus Torvalds 283b77a493bSEric Paris length = -ENOMEM; 284bfd51626SDavi Arnaut if (count >= PAGE_SIZE) 2856eab04a8SJustin P. Mattock goto out; 286b77a493bSEric Paris 2871da177e4SLinus Torvalds /* No partial writes. */ 288b77a493bSEric Paris length = -EINVAL; 289b77a493bSEric Paris if (*ppos != 0) 290b77a493bSEric Paris goto out; 291b77a493bSEric Paris 292b77a493bSEric Paris length = -ENOMEM; 2931da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 2941da177e4SLinus Torvalds if (!page) 295b77a493bSEric Paris goto out; 296b77a493bSEric Paris 2971da177e4SLinus Torvalds length = -EFAULT; 2981da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 2991da177e4SLinus Torvalds goto out; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds length = -EINVAL; 3021da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 3031da177e4SLinus Torvalds goto out; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds if (new_value) { 3061da177e4SLinus Torvalds length = selinux_disable(); 307b77a493bSEric Paris if (length) 3081da177e4SLinus Torvalds goto out; 309af601e46SSteve Grubb audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, 3104746ec5bSEric Paris "selinux=0 auid=%u ses=%u", 311581abc09SEric W. Biederman from_kuid(&init_user_ns, audit_get_loginuid(current)), 3124746ec5bSEric Paris audit_get_sessionid(current)); 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds length = count; 3161da177e4SLinus Torvalds out: 3171da177e4SLinus Torvalds free_page((unsigned long) page); 3181da177e4SLinus Torvalds return length; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds #else 3211da177e4SLinus Torvalds #define sel_write_disable NULL 3221da177e4SLinus Torvalds #endif 3231da177e4SLinus Torvalds 3249c2e08c5SArjan van de Ven static const struct file_operations sel_disable_ops = { 3251da177e4SLinus Torvalds .write = sel_write_disable, 32657a62c23SArnd Bergmann .llseek = generic_file_llseek, 3271da177e4SLinus Torvalds }; 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, 3301da177e4SLinus Torvalds size_t count, loff_t *ppos) 3311da177e4SLinus Torvalds { 3321da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 3331da177e4SLinus Torvalds ssize_t length; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); 3361da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 3371da177e4SLinus Torvalds } 3381da177e4SLinus Torvalds 3399c2e08c5SArjan van de Ven static const struct file_operations sel_policyvers_ops = { 3401da177e4SLinus Torvalds .read = sel_read_policyvers, 34157a62c23SArnd Bergmann .llseek = generic_file_llseek, 3421da177e4SLinus Torvalds }; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds /* declaration for sel_write_load */ 3451da177e4SLinus Torvalds static int sel_make_bools(void); 346e47c8fc5SChristopher J. PeBenito static int sel_make_classes(void); 3473bb56b25SPaul Moore static int sel_make_policycap(void); 348e47c8fc5SChristopher J. PeBenito 349e47c8fc5SChristopher J. PeBenito /* declaration for sel_make_class_dirs */ 350a1c2aa1eSAl Viro static struct dentry *sel_make_dir(struct dentry *dir, const char *name, 351e47c8fc5SChristopher J. PeBenito unsigned long *ino); 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds static ssize_t sel_read_mls(struct file *filp, char __user *buf, 3541da177e4SLinus Torvalds size_t count, loff_t *ppos) 3551da177e4SLinus Torvalds { 3561da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 3571da177e4SLinus Torvalds ssize_t length; 3581da177e4SLinus Torvalds 3590719aaf5SGuido Trentalancia length = scnprintf(tmpbuf, TMPBUFLEN, "%d", 3600719aaf5SGuido Trentalancia security_mls_enabled()); 3611da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds 3649c2e08c5SArjan van de Ven static const struct file_operations sel_mls_ops = { 3651da177e4SLinus Torvalds .read = sel_read_mls, 36657a62c23SArnd Bergmann .llseek = generic_file_llseek, 3671da177e4SLinus Torvalds }; 3681da177e4SLinus Torvalds 369cee74f47SEric Paris struct policy_load_memory { 370cee74f47SEric Paris size_t len; 371cee74f47SEric Paris void *data; 372cee74f47SEric Paris }; 373cee74f47SEric Paris 374cee74f47SEric Paris static int sel_open_policy(struct inode *inode, struct file *filp) 375cee74f47SEric Paris { 376cee74f47SEric Paris struct policy_load_memory *plm = NULL; 377cee74f47SEric Paris int rc; 378cee74f47SEric Paris 379cee74f47SEric Paris BUG_ON(filp->private_data); 380cee74f47SEric Paris 381cee74f47SEric Paris mutex_lock(&sel_mutex); 382cee74f47SEric Paris 383cee74f47SEric Paris rc = task_has_security(current, SECURITY__READ_POLICY); 384cee74f47SEric Paris if (rc) 385cee74f47SEric Paris goto err; 386cee74f47SEric Paris 387cee74f47SEric Paris rc = -EBUSY; 388cee74f47SEric Paris if (policy_opened) 389cee74f47SEric Paris goto err; 390cee74f47SEric Paris 391cee74f47SEric Paris rc = -ENOMEM; 392cee74f47SEric Paris plm = kzalloc(sizeof(*plm), GFP_KERNEL); 393cee74f47SEric Paris if (!plm) 394cee74f47SEric Paris goto err; 395cee74f47SEric Paris 396cee74f47SEric Paris if (i_size_read(inode) != security_policydb_len()) { 397cee74f47SEric Paris mutex_lock(&inode->i_mutex); 398cee74f47SEric Paris i_size_write(inode, security_policydb_len()); 399cee74f47SEric Paris mutex_unlock(&inode->i_mutex); 400cee74f47SEric Paris } 401cee74f47SEric Paris 402cee74f47SEric Paris rc = security_read_policy(&plm->data, &plm->len); 403cee74f47SEric Paris if (rc) 404cee74f47SEric Paris goto err; 405cee74f47SEric Paris 406cee74f47SEric Paris policy_opened = 1; 407cee74f47SEric Paris 408cee74f47SEric Paris filp->private_data = plm; 409cee74f47SEric Paris 410cee74f47SEric Paris mutex_unlock(&sel_mutex); 411cee74f47SEric Paris 412cee74f47SEric Paris return 0; 413cee74f47SEric Paris err: 414cee74f47SEric Paris mutex_unlock(&sel_mutex); 415cee74f47SEric Paris 416cee74f47SEric Paris if (plm) 417cee74f47SEric Paris vfree(plm->data); 418cee74f47SEric Paris kfree(plm); 419cee74f47SEric Paris return rc; 420cee74f47SEric Paris } 421cee74f47SEric Paris 422cee74f47SEric Paris static int sel_release_policy(struct inode *inode, struct file *filp) 423cee74f47SEric Paris { 424cee74f47SEric Paris struct policy_load_memory *plm = filp->private_data; 425cee74f47SEric Paris 426cee74f47SEric Paris BUG_ON(!plm); 427cee74f47SEric Paris 428cee74f47SEric Paris policy_opened = 0; 429cee74f47SEric Paris 430cee74f47SEric Paris vfree(plm->data); 431cee74f47SEric Paris kfree(plm); 432cee74f47SEric Paris 433cee74f47SEric Paris return 0; 434cee74f47SEric Paris } 435cee74f47SEric Paris 436cee74f47SEric Paris static ssize_t sel_read_policy(struct file *filp, char __user *buf, 437cee74f47SEric Paris size_t count, loff_t *ppos) 438cee74f47SEric Paris { 439cee74f47SEric Paris struct policy_load_memory *plm = filp->private_data; 440cee74f47SEric Paris int ret; 441cee74f47SEric Paris 442cee74f47SEric Paris mutex_lock(&sel_mutex); 443cee74f47SEric Paris 444cee74f47SEric Paris ret = task_has_security(current, SECURITY__READ_POLICY); 445cee74f47SEric Paris if (ret) 446cee74f47SEric Paris goto out; 447cee74f47SEric Paris 448cee74f47SEric Paris ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); 449cee74f47SEric Paris out: 450cee74f47SEric Paris mutex_unlock(&sel_mutex); 451cee74f47SEric Paris return ret; 452cee74f47SEric Paris } 453cee74f47SEric Paris 454845ca30fSEric Paris static int sel_mmap_policy_fault(struct vm_area_struct *vma, 455845ca30fSEric Paris struct vm_fault *vmf) 456845ca30fSEric Paris { 457845ca30fSEric Paris struct policy_load_memory *plm = vma->vm_file->private_data; 458845ca30fSEric Paris unsigned long offset; 459845ca30fSEric Paris struct page *page; 460845ca30fSEric Paris 461845ca30fSEric Paris if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) 462845ca30fSEric Paris return VM_FAULT_SIGBUS; 463845ca30fSEric Paris 464845ca30fSEric Paris offset = vmf->pgoff << PAGE_SHIFT; 465845ca30fSEric Paris if (offset >= roundup(plm->len, PAGE_SIZE)) 466845ca30fSEric Paris return VM_FAULT_SIGBUS; 467845ca30fSEric Paris 468845ca30fSEric Paris page = vmalloc_to_page(plm->data + offset); 469845ca30fSEric Paris get_page(page); 470845ca30fSEric Paris 471845ca30fSEric Paris vmf->page = page; 472845ca30fSEric Paris 473845ca30fSEric Paris return 0; 474845ca30fSEric Paris } 475845ca30fSEric Paris 4767cbea8dcSKirill A. Shutemov static const struct vm_operations_struct sel_mmap_policy_ops = { 477845ca30fSEric Paris .fault = sel_mmap_policy_fault, 478845ca30fSEric Paris .page_mkwrite = sel_mmap_policy_fault, 479845ca30fSEric Paris }; 480845ca30fSEric Paris 481ad3fa08cSJames Morris static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) 482845ca30fSEric Paris { 483845ca30fSEric Paris if (vma->vm_flags & VM_SHARED) { 484845ca30fSEric Paris /* do not allow mprotect to make mapping writable */ 485845ca30fSEric Paris vma->vm_flags &= ~VM_MAYWRITE; 486845ca30fSEric Paris 487845ca30fSEric Paris if (vma->vm_flags & VM_WRITE) 488845ca30fSEric Paris return -EACCES; 489845ca30fSEric Paris } 490845ca30fSEric Paris 491314e51b9SKonstantin Khlebnikov vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 492845ca30fSEric Paris vma->vm_ops = &sel_mmap_policy_ops; 493845ca30fSEric Paris 494845ca30fSEric Paris return 0; 495845ca30fSEric Paris } 496845ca30fSEric Paris 497cee74f47SEric Paris static const struct file_operations sel_policy_ops = { 498cee74f47SEric Paris .open = sel_open_policy, 499cee74f47SEric Paris .read = sel_read_policy, 500845ca30fSEric Paris .mmap = sel_mmap_policy, 501cee74f47SEric Paris .release = sel_release_policy, 50247a93a5bSEric Paris .llseek = generic_file_llseek, 503cee74f47SEric Paris }; 504cee74f47SEric Paris 5051da177e4SLinus Torvalds static ssize_t sel_write_load(struct file *file, const char __user *buf, 5061da177e4SLinus Torvalds size_t count, loff_t *ppos) 5071da177e4SLinus Torvalds 5081da177e4SLinus Torvalds { 5091da177e4SLinus Torvalds ssize_t length; 5101da177e4SLinus Torvalds void *data = NULL; 5111da177e4SLinus Torvalds 512bb003079SIngo Molnar mutex_lock(&sel_mutex); 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds length = task_has_security(current, SECURITY__LOAD_POLICY); 5151da177e4SLinus Torvalds if (length) 5161da177e4SLinus Torvalds goto out; 5171da177e4SLinus Torvalds 5181da177e4SLinus Torvalds /* No partial writes. */ 5191da177e4SLinus Torvalds length = -EINVAL; 520b77a493bSEric Paris if (*ppos != 0) 5211da177e4SLinus Torvalds goto out; 5221da177e4SLinus Torvalds 523b77a493bSEric Paris length = -EFBIG; 524b77a493bSEric Paris if (count > 64 * 1024 * 1024) 5251da177e4SLinus Torvalds goto out; 526b77a493bSEric Paris 527b77a493bSEric Paris length = -ENOMEM; 528b77a493bSEric Paris data = vmalloc(count); 529b77a493bSEric Paris if (!data) 530b77a493bSEric Paris goto out; 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds length = -EFAULT; 5331da177e4SLinus Torvalds if (copy_from_user(data, buf, count) != 0) 5341da177e4SLinus Torvalds goto out; 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds length = security_load_policy(data, count); 5371da177e4SLinus Torvalds if (length) 5381da177e4SLinus Torvalds goto out; 5391da177e4SLinus Torvalds 540b77a493bSEric Paris length = sel_make_bools(); 541b77a493bSEric Paris if (length) 542e47c8fc5SChristopher J. PeBenito goto out1; 543e47c8fc5SChristopher J. PeBenito 544b77a493bSEric Paris length = sel_make_classes(); 545b77a493bSEric Paris if (length) 5463bb56b25SPaul Moore goto out1; 5473bb56b25SPaul Moore 548b77a493bSEric Paris length = sel_make_policycap(); 549b77a493bSEric Paris if (length) 550b77a493bSEric Paris goto out1; 551b77a493bSEric Paris 5521da177e4SLinus Torvalds length = count; 553e47c8fc5SChristopher J. PeBenito 554e47c8fc5SChristopher J. PeBenito out1: 555af601e46SSteve Grubb audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, 5564746ec5bSEric Paris "policy loaded auid=%u ses=%u", 557581abc09SEric W. Biederman from_kuid(&init_user_ns, audit_get_loginuid(current)), 5584746ec5bSEric Paris audit_get_sessionid(current)); 5591da177e4SLinus Torvalds out: 560bb003079SIngo Molnar mutex_unlock(&sel_mutex); 5611da177e4SLinus Torvalds vfree(data); 5621da177e4SLinus Torvalds return length; 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds 5659c2e08c5SArjan van de Ven static const struct file_operations sel_load_ops = { 5661da177e4SLinus Torvalds .write = sel_write_load, 56757a62c23SArnd Bergmann .llseek = generic_file_llseek, 5681da177e4SLinus Torvalds }; 5691da177e4SLinus Torvalds 570ce9982d0SStephen Smalley static ssize_t sel_write_context(struct file *file, char *buf, size_t size) 5711da177e4SLinus Torvalds { 572b77a493bSEric Paris char *canon = NULL; 573ce9982d0SStephen Smalley u32 sid, len; 5741da177e4SLinus Torvalds ssize_t length; 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds length = task_has_security(current, SECURITY__CHECK_CONTEXT); 5771da177e4SLinus Torvalds if (length) 578b77a493bSEric Paris goto out; 5791da177e4SLinus Torvalds 58052a4c640SNikolay Aleksandrov length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); 581b77a493bSEric Paris if (length) 582b77a493bSEric Paris goto out; 5831da177e4SLinus Torvalds 584ce9982d0SStephen Smalley length = security_sid_to_context(sid, &canon, &len); 585b77a493bSEric Paris if (length) 586b77a493bSEric Paris goto out; 587ce9982d0SStephen Smalley 588b77a493bSEric Paris length = -ERANGE; 589ce9982d0SStephen Smalley if (len > SIMPLE_TRANSACTION_LIMIT) { 590744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 591744ba35eSEric Paris "payload max\n", __func__, len); 592ce9982d0SStephen Smalley goto out; 593ce9982d0SStephen Smalley } 594ce9982d0SStephen Smalley 595ce9982d0SStephen Smalley memcpy(buf, canon, len); 596ce9982d0SStephen Smalley length = len; 5971da177e4SLinus Torvalds out: 598ce9982d0SStephen Smalley kfree(canon); 5991da177e4SLinus Torvalds return length; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, 6031da177e4SLinus Torvalds size_t count, loff_t *ppos) 6041da177e4SLinus Torvalds { 6051da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 6061da177e4SLinus Torvalds ssize_t length; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); 6091da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, 6131da177e4SLinus Torvalds size_t count, loff_t *ppos) 6141da177e4SLinus Torvalds { 615b77a493bSEric Paris char *page = NULL; 6161da177e4SLinus Torvalds ssize_t length; 6171da177e4SLinus Torvalds unsigned int new_value; 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETCHECKREQPROT); 6201da177e4SLinus Torvalds if (length) 621b77a493bSEric Paris goto out; 6221da177e4SLinus Torvalds 623b77a493bSEric Paris length = -ENOMEM; 624bfd51626SDavi Arnaut if (count >= PAGE_SIZE) 625b77a493bSEric Paris goto out; 626b77a493bSEric Paris 6271da177e4SLinus Torvalds /* No partial writes. */ 628b77a493bSEric Paris length = -EINVAL; 629b77a493bSEric Paris if (*ppos != 0) 630b77a493bSEric Paris goto out; 631b77a493bSEric Paris 632b77a493bSEric Paris length = -ENOMEM; 6331da177e4SLinus Torvalds page = (char *)get_zeroed_page(GFP_KERNEL); 6341da177e4SLinus Torvalds if (!page) 635b77a493bSEric Paris goto out; 636b77a493bSEric Paris 6371da177e4SLinus Torvalds length = -EFAULT; 6381da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 6391da177e4SLinus Torvalds goto out; 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds length = -EINVAL; 6421da177e4SLinus Torvalds if (sscanf(page, "%u", &new_value) != 1) 6431da177e4SLinus Torvalds goto out; 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds selinux_checkreqprot = new_value ? 1 : 0; 6461da177e4SLinus Torvalds length = count; 6471da177e4SLinus Torvalds out: 6481da177e4SLinus Torvalds free_page((unsigned long) page); 6491da177e4SLinus Torvalds return length; 6501da177e4SLinus Torvalds } 6519c2e08c5SArjan van de Ven static const struct file_operations sel_checkreqprot_ops = { 6521da177e4SLinus Torvalds .read = sel_read_checkreqprot, 6531da177e4SLinus Torvalds .write = sel_write_checkreqprot, 65457a62c23SArnd Bergmann .llseek = generic_file_llseek, 6551da177e4SLinus Torvalds }; 6561da177e4SLinus Torvalds 657f9df6458SAndrew Perepechko static ssize_t sel_write_validatetrans(struct file *file, 658f9df6458SAndrew Perepechko const char __user *buf, 659f9df6458SAndrew Perepechko size_t count, loff_t *ppos) 660f9df6458SAndrew Perepechko { 661f9df6458SAndrew Perepechko char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; 662f9df6458SAndrew Perepechko char *req = NULL; 663f9df6458SAndrew Perepechko u32 osid, nsid, tsid; 664f9df6458SAndrew Perepechko u16 tclass; 665f9df6458SAndrew Perepechko int rc; 666f9df6458SAndrew Perepechko 667f9df6458SAndrew Perepechko rc = task_has_security(current, SECURITY__VALIDATE_TRANS); 668f9df6458SAndrew Perepechko if (rc) 669f9df6458SAndrew Perepechko goto out; 670f9df6458SAndrew Perepechko 671f9df6458SAndrew Perepechko rc = -ENOMEM; 672f9df6458SAndrew Perepechko if (count >= PAGE_SIZE) 673f9df6458SAndrew Perepechko goto out; 674f9df6458SAndrew Perepechko 675f9df6458SAndrew Perepechko /* No partial writes. */ 676f9df6458SAndrew Perepechko rc = -EINVAL; 677f9df6458SAndrew Perepechko if (*ppos != 0) 678f9df6458SAndrew Perepechko goto out; 679f9df6458SAndrew Perepechko 680f9df6458SAndrew Perepechko rc = -ENOMEM; 681f9df6458SAndrew Perepechko req = kzalloc(count + 1, GFP_KERNEL); 682f9df6458SAndrew Perepechko if (!req) 683f9df6458SAndrew Perepechko goto out; 684f9df6458SAndrew Perepechko 685f9df6458SAndrew Perepechko rc = -EFAULT; 686f9df6458SAndrew Perepechko if (copy_from_user(req, buf, count)) 687f9df6458SAndrew Perepechko goto out; 688f9df6458SAndrew Perepechko 689f9df6458SAndrew Perepechko rc = -ENOMEM; 690f9df6458SAndrew Perepechko oldcon = kzalloc(count + 1, GFP_KERNEL); 691f9df6458SAndrew Perepechko if (!oldcon) 692f9df6458SAndrew Perepechko goto out; 693f9df6458SAndrew Perepechko 694f9df6458SAndrew Perepechko newcon = kzalloc(count + 1, GFP_KERNEL); 695f9df6458SAndrew Perepechko if (!newcon) 696f9df6458SAndrew Perepechko goto out; 697f9df6458SAndrew Perepechko 698f9df6458SAndrew Perepechko taskcon = kzalloc(count + 1, GFP_KERNEL); 699f9df6458SAndrew Perepechko if (!taskcon) 700f9df6458SAndrew Perepechko goto out; 701f9df6458SAndrew Perepechko 702f9df6458SAndrew Perepechko rc = -EINVAL; 703f9df6458SAndrew Perepechko if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) 704f9df6458SAndrew Perepechko goto out; 705f9df6458SAndrew Perepechko 706f9df6458SAndrew Perepechko rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); 707f9df6458SAndrew Perepechko if (rc) 708f9df6458SAndrew Perepechko goto out; 709f9df6458SAndrew Perepechko 710f9df6458SAndrew Perepechko rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); 711f9df6458SAndrew Perepechko if (rc) 712f9df6458SAndrew Perepechko goto out; 713f9df6458SAndrew Perepechko 714f9df6458SAndrew Perepechko rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); 715f9df6458SAndrew Perepechko if (rc) 716f9df6458SAndrew Perepechko goto out; 717f9df6458SAndrew Perepechko 718f9df6458SAndrew Perepechko rc = security_validate_transition_user(osid, nsid, tsid, tclass); 719f9df6458SAndrew Perepechko if (!rc) 720f9df6458SAndrew Perepechko rc = count; 721f9df6458SAndrew Perepechko out: 722f9df6458SAndrew Perepechko kfree(req); 723f9df6458SAndrew Perepechko kfree(oldcon); 724f9df6458SAndrew Perepechko kfree(newcon); 725f9df6458SAndrew Perepechko kfree(taskcon); 726f9df6458SAndrew Perepechko return rc; 727f9df6458SAndrew Perepechko } 728f9df6458SAndrew Perepechko 729f9df6458SAndrew Perepechko static const struct file_operations sel_transition_ops = { 730f9df6458SAndrew Perepechko .write = sel_write_validatetrans, 731f9df6458SAndrew Perepechko .llseek = generic_file_llseek, 732f9df6458SAndrew Perepechko }; 733f9df6458SAndrew Perepechko 7341da177e4SLinus Torvalds /* 7351da177e4SLinus Torvalds * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c 7361da177e4SLinus Torvalds */ 7371da177e4SLinus Torvalds static ssize_t sel_write_access(struct file *file, char *buf, size_t size); 7381da177e4SLinus Torvalds static ssize_t sel_write_create(struct file *file, char *buf, size_t size); 7391da177e4SLinus Torvalds static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); 7401da177e4SLinus Torvalds static ssize_t sel_write_user(struct file *file, char *buf, size_t size); 7411da177e4SLinus Torvalds static ssize_t sel_write_member(struct file *file, char *buf, size_t size); 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvalds static ssize_t (*write_op[])(struct file *, char *, size_t) = { 7441da177e4SLinus Torvalds [SEL_ACCESS] = sel_write_access, 7451da177e4SLinus Torvalds [SEL_CREATE] = sel_write_create, 7461da177e4SLinus Torvalds [SEL_RELABEL] = sel_write_relabel, 7471da177e4SLinus Torvalds [SEL_USER] = sel_write_user, 7481da177e4SLinus Torvalds [SEL_MEMBER] = sel_write_member, 749ce9982d0SStephen Smalley [SEL_CONTEXT] = sel_write_context, 7501da177e4SLinus Torvalds }; 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) 7531da177e4SLinus Torvalds { 754496ad9aaSAl Viro ino_t ino = file_inode(file)->i_ino; 7551da177e4SLinus Torvalds char *data; 7561da177e4SLinus Torvalds ssize_t rv; 7571da177e4SLinus Torvalds 7586e20a64aSNicolas Kaiser if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) 7591da177e4SLinus Torvalds return -EINVAL; 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds data = simple_transaction_get(file, buf, size); 7621da177e4SLinus Torvalds if (IS_ERR(data)) 7631da177e4SLinus Torvalds return PTR_ERR(data); 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds rv = write_op[ino](file, data, size); 7661da177e4SLinus Torvalds if (rv > 0) { 7671da177e4SLinus Torvalds simple_transaction_set(file, rv); 7681da177e4SLinus Torvalds rv = size; 7691da177e4SLinus Torvalds } 7701da177e4SLinus Torvalds return rv; 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds 7739c2e08c5SArjan van de Ven static const struct file_operations transaction_ops = { 7741da177e4SLinus Torvalds .write = selinux_transaction_write, 7751da177e4SLinus Torvalds .read = simple_transaction_read, 7761da177e4SLinus Torvalds .release = simple_transaction_release, 77757a62c23SArnd Bergmann .llseek = generic_file_llseek, 7781da177e4SLinus Torvalds }; 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvalds /* 7811da177e4SLinus Torvalds * payload - write methods 7821da177e4SLinus Torvalds * If the method has a response, the response should be put in buf, 7831da177e4SLinus Torvalds * and the length returned. Otherwise return 0 or and -error. 7841da177e4SLinus Torvalds */ 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvalds static ssize_t sel_write_access(struct file *file, char *buf, size_t size) 7871da177e4SLinus Torvalds { 788b77a493bSEric Paris char *scon = NULL, *tcon = NULL; 7891da177e4SLinus Torvalds u32 ssid, tsid; 7901da177e4SLinus Torvalds u16 tclass; 7911da177e4SLinus Torvalds struct av_decision avd; 7921da177e4SLinus Torvalds ssize_t length; 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_AV); 7951da177e4SLinus Torvalds if (length) 796b77a493bSEric Paris goto out; 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvalds length = -ENOMEM; 79989d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 8001da177e4SLinus Torvalds if (!scon) 801b77a493bSEric Paris goto out; 8021da177e4SLinus Torvalds 803b77a493bSEric Paris length = -ENOMEM; 80489d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 8051da177e4SLinus Torvalds if (!tcon) 8061da177e4SLinus Torvalds goto out; 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds length = -EINVAL; 80919439d05SStephen Smalley if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 810b77a493bSEric Paris goto out; 8111da177e4SLinus Torvalds 81244be2f65SRasmus Villemoes length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); 813b77a493bSEric Paris if (length) 814b77a493bSEric Paris goto out; 815b77a493bSEric Paris 81644be2f65SRasmus Villemoes length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); 817b77a493bSEric Paris if (length) 818b77a493bSEric Paris goto out; 8191da177e4SLinus Torvalds 82019439d05SStephen Smalley security_compute_av_user(ssid, tsid, tclass, &avd); 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, 8238a6f83afSKaiGai Kohei "%x %x %x %x %u %x", 824f1c6381aSEric Paris avd.allowed, 0xffffffff, 8251da177e4SLinus Torvalds avd.auditallow, avd.auditdeny, 8268a6f83afSKaiGai Kohei avd.seqno, avd.flags); 8271da177e4SLinus Torvalds out: 828b77a493bSEric Paris kfree(tcon); 8291da177e4SLinus Torvalds kfree(scon); 8301da177e4SLinus Torvalds return length; 8311da177e4SLinus Torvalds } 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvalds static ssize_t sel_write_create(struct file *file, char *buf, size_t size) 8341da177e4SLinus Torvalds { 835b77a493bSEric Paris char *scon = NULL, *tcon = NULL; 836f50a3ec9SKohei Kaigai char *namebuf = NULL, *objname = NULL; 8371da177e4SLinus Torvalds u32 ssid, tsid, newsid; 8381da177e4SLinus Torvalds u16 tclass; 8391da177e4SLinus Torvalds ssize_t length; 840b77a493bSEric Paris char *newcon = NULL; 8411da177e4SLinus Torvalds u32 len; 842f50a3ec9SKohei Kaigai int nargs; 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_CREATE); 8451da177e4SLinus Torvalds if (length) 846b77a493bSEric Paris goto out; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds length = -ENOMEM; 84989d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 8501da177e4SLinus Torvalds if (!scon) 851b77a493bSEric Paris goto out; 8521da177e4SLinus Torvalds 853b77a493bSEric Paris length = -ENOMEM; 85489d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 8551da177e4SLinus Torvalds if (!tcon) 8561da177e4SLinus Torvalds goto out; 8571da177e4SLinus Torvalds 858f50a3ec9SKohei Kaigai length = -ENOMEM; 859f50a3ec9SKohei Kaigai namebuf = kzalloc(size + 1, GFP_KERNEL); 860f50a3ec9SKohei Kaigai if (!namebuf) 861b77a493bSEric Paris goto out; 8621da177e4SLinus Torvalds 863f50a3ec9SKohei Kaigai length = -EINVAL; 864f50a3ec9SKohei Kaigai nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); 865f50a3ec9SKohei Kaigai if (nargs < 3 || nargs > 4) 866f50a3ec9SKohei Kaigai goto out; 8670f7e4c33SKohei Kaigai if (nargs == 4) { 8680f7e4c33SKohei Kaigai /* 8690f7e4c33SKohei Kaigai * If and when the name of new object to be queried contains 8700f7e4c33SKohei Kaigai * either whitespace or multibyte characters, they shall be 8710f7e4c33SKohei Kaigai * encoded based on the percentage-encoding rule. 8720f7e4c33SKohei Kaigai * If not encoded, the sscanf logic picks up only left-half 8730f7e4c33SKohei Kaigai * of the supplied name; splitted by a whitespace unexpectedly. 8740f7e4c33SKohei Kaigai */ 8750f7e4c33SKohei Kaigai char *r, *w; 8760f7e4c33SKohei Kaigai int c1, c2; 8770f7e4c33SKohei Kaigai 8780f7e4c33SKohei Kaigai r = w = namebuf; 8790f7e4c33SKohei Kaigai do { 8800f7e4c33SKohei Kaigai c1 = *r++; 8810f7e4c33SKohei Kaigai if (c1 == '+') 8820f7e4c33SKohei Kaigai c1 = ' '; 8830f7e4c33SKohei Kaigai else if (c1 == '%') { 884af7ff2c2SAndy Shevchenko c1 = hex_to_bin(*r++); 885af7ff2c2SAndy Shevchenko if (c1 < 0) 8860f7e4c33SKohei Kaigai goto out; 887af7ff2c2SAndy Shevchenko c2 = hex_to_bin(*r++); 888af7ff2c2SAndy Shevchenko if (c2 < 0) 8890f7e4c33SKohei Kaigai goto out; 8900f7e4c33SKohei Kaigai c1 = (c1 << 4) | c2; 8910f7e4c33SKohei Kaigai } 8920f7e4c33SKohei Kaigai *w++ = c1; 8930f7e4c33SKohei Kaigai } while (c1 != '\0'); 8940f7e4c33SKohei Kaigai 895f50a3ec9SKohei Kaigai objname = namebuf; 8960f7e4c33SKohei Kaigai } 897f50a3ec9SKohei Kaigai 89844be2f65SRasmus Villemoes length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); 899b77a493bSEric Paris if (length) 900b77a493bSEric Paris goto out; 901b77a493bSEric Paris 90244be2f65SRasmus Villemoes length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); 903b77a493bSEric Paris if (length) 904b77a493bSEric Paris goto out; 9051da177e4SLinus Torvalds 906f50a3ec9SKohei Kaigai length = security_transition_sid_user(ssid, tsid, tclass, 907f50a3ec9SKohei Kaigai objname, &newsid); 908b77a493bSEric Paris if (length) 909b77a493bSEric Paris goto out; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds length = security_sid_to_context(newsid, &newcon, &len); 912b77a493bSEric Paris if (length) 913b77a493bSEric Paris goto out; 9141da177e4SLinus Torvalds 915b77a493bSEric Paris length = -ERANGE; 9161da177e4SLinus Torvalds if (len > SIMPLE_TRANSACTION_LIMIT) { 917744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 918744ba35eSEric Paris "payload max\n", __func__, len); 919b77a493bSEric Paris goto out; 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds memcpy(buf, newcon, len); 9231da177e4SLinus Torvalds length = len; 9241da177e4SLinus Torvalds out: 925b77a493bSEric Paris kfree(newcon); 926f50a3ec9SKohei Kaigai kfree(namebuf); 927b77a493bSEric Paris kfree(tcon); 9281da177e4SLinus Torvalds kfree(scon); 9291da177e4SLinus Torvalds return length; 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds 9321da177e4SLinus Torvalds static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) 9331da177e4SLinus Torvalds { 934b77a493bSEric Paris char *scon = NULL, *tcon = NULL; 9351da177e4SLinus Torvalds u32 ssid, tsid, newsid; 9361da177e4SLinus Torvalds u16 tclass; 9371da177e4SLinus Torvalds ssize_t length; 938b77a493bSEric Paris char *newcon = NULL; 9391da177e4SLinus Torvalds u32 len; 9401da177e4SLinus Torvalds 9411da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_RELABEL); 9421da177e4SLinus Torvalds if (length) 943b77a493bSEric Paris goto out; 9441da177e4SLinus Torvalds 9451da177e4SLinus Torvalds length = -ENOMEM; 94689d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 9471da177e4SLinus Torvalds if (!scon) 948b77a493bSEric Paris goto out; 9491da177e4SLinus Torvalds 950b77a493bSEric Paris length = -ENOMEM; 95189d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 9521da177e4SLinus Torvalds if (!tcon) 9531da177e4SLinus Torvalds goto out; 9541da177e4SLinus Torvalds 9551da177e4SLinus Torvalds length = -EINVAL; 9561da177e4SLinus Torvalds if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 957b77a493bSEric Paris goto out; 9581da177e4SLinus Torvalds 95944be2f65SRasmus Villemoes length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); 960b77a493bSEric Paris if (length) 961b77a493bSEric Paris goto out; 962b77a493bSEric Paris 96344be2f65SRasmus Villemoes length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); 964b77a493bSEric Paris if (length) 965b77a493bSEric Paris goto out; 9661da177e4SLinus Torvalds 9671da177e4SLinus Torvalds length = security_change_sid(ssid, tsid, tclass, &newsid); 968b77a493bSEric Paris if (length) 969b77a493bSEric Paris goto out; 9701da177e4SLinus Torvalds 9711da177e4SLinus Torvalds length = security_sid_to_context(newsid, &newcon, &len); 972b77a493bSEric Paris if (length) 973b77a493bSEric Paris goto out; 9741da177e4SLinus Torvalds 9751da177e4SLinus Torvalds length = -ERANGE; 976b77a493bSEric Paris if (len > SIMPLE_TRANSACTION_LIMIT) 977b77a493bSEric Paris goto out; 9781da177e4SLinus Torvalds 9791da177e4SLinus Torvalds memcpy(buf, newcon, len); 9801da177e4SLinus Torvalds length = len; 9811da177e4SLinus Torvalds out: 982b77a493bSEric Paris kfree(newcon); 983b77a493bSEric Paris kfree(tcon); 9841da177e4SLinus Torvalds kfree(scon); 9851da177e4SLinus Torvalds return length; 9861da177e4SLinus Torvalds } 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds static ssize_t sel_write_user(struct file *file, char *buf, size_t size) 9891da177e4SLinus Torvalds { 990b77a493bSEric Paris char *con = NULL, *user = NULL, *ptr; 991b77a493bSEric Paris u32 sid, *sids = NULL; 9921da177e4SLinus Torvalds ssize_t length; 9931da177e4SLinus Torvalds char *newcon; 9941da177e4SLinus Torvalds int i, rc; 9951da177e4SLinus Torvalds u32 len, nsids; 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_USER); 9981da177e4SLinus Torvalds if (length) 9996eab04a8SJustin P. Mattock goto out; 10001da177e4SLinus Torvalds 10011da177e4SLinus Torvalds length = -ENOMEM; 100289d155efSJames Morris con = kzalloc(size + 1, GFP_KERNEL); 10031da177e4SLinus Torvalds if (!con) 10046eab04a8SJustin P. Mattock goto out; 10051da177e4SLinus Torvalds 1006b77a493bSEric Paris length = -ENOMEM; 100789d155efSJames Morris user = kzalloc(size + 1, GFP_KERNEL); 10081da177e4SLinus Torvalds if (!user) 10091da177e4SLinus Torvalds goto out; 10101da177e4SLinus Torvalds 10111da177e4SLinus Torvalds length = -EINVAL; 10121da177e4SLinus Torvalds if (sscanf(buf, "%s %s", con, user) != 2) 1013b77a493bSEric Paris goto out; 10141da177e4SLinus Torvalds 101544be2f65SRasmus Villemoes length = security_context_str_to_sid(con, &sid, GFP_KERNEL); 1016b77a493bSEric Paris if (length) 1017b77a493bSEric Paris goto out; 10181da177e4SLinus Torvalds 10191da177e4SLinus Torvalds length = security_get_user_sids(sid, user, &sids, &nsids); 1020b77a493bSEric Paris if (length) 1021b77a493bSEric Paris goto out; 10221da177e4SLinus Torvalds 10231da177e4SLinus Torvalds length = sprintf(buf, "%u", nsids) + 1; 10241da177e4SLinus Torvalds ptr = buf + length; 10251da177e4SLinus Torvalds for (i = 0; i < nsids; i++) { 10261da177e4SLinus Torvalds rc = security_sid_to_context(sids[i], &newcon, &len); 10271da177e4SLinus Torvalds if (rc) { 10281da177e4SLinus Torvalds length = rc; 1029b77a493bSEric Paris goto out; 10301da177e4SLinus Torvalds } 10311da177e4SLinus Torvalds if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { 10321da177e4SLinus Torvalds kfree(newcon); 10331da177e4SLinus Torvalds length = -ERANGE; 1034b77a493bSEric Paris goto out; 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds memcpy(ptr, newcon, len); 10371da177e4SLinus Torvalds kfree(newcon); 10381da177e4SLinus Torvalds ptr += len; 10391da177e4SLinus Torvalds length += len; 10401da177e4SLinus Torvalds } 10411da177e4SLinus Torvalds out: 1042b77a493bSEric Paris kfree(sids); 1043b77a493bSEric Paris kfree(user); 10441da177e4SLinus Torvalds kfree(con); 10451da177e4SLinus Torvalds return length; 10461da177e4SLinus Torvalds } 10471da177e4SLinus Torvalds 10481da177e4SLinus Torvalds static ssize_t sel_write_member(struct file *file, char *buf, size_t size) 10491da177e4SLinus Torvalds { 1050b77a493bSEric Paris char *scon = NULL, *tcon = NULL; 10511da177e4SLinus Torvalds u32 ssid, tsid, newsid; 10521da177e4SLinus Torvalds u16 tclass; 10531da177e4SLinus Torvalds ssize_t length; 1054b77a493bSEric Paris char *newcon = NULL; 10551da177e4SLinus Torvalds u32 len; 10561da177e4SLinus Torvalds 10571da177e4SLinus Torvalds length = task_has_security(current, SECURITY__COMPUTE_MEMBER); 10581da177e4SLinus Torvalds if (length) 1059b77a493bSEric Paris goto out; 10601da177e4SLinus Torvalds 10611da177e4SLinus Torvalds length = -ENOMEM; 106289d155efSJames Morris scon = kzalloc(size + 1, GFP_KERNEL); 10631da177e4SLinus Torvalds if (!scon) 10646eab04a8SJustin P. Mattock goto out; 10651da177e4SLinus Torvalds 1066b77a493bSEric Paris length = -ENOMEM; 106789d155efSJames Morris tcon = kzalloc(size + 1, GFP_KERNEL); 10681da177e4SLinus Torvalds if (!tcon) 10691da177e4SLinus Torvalds goto out; 10701da177e4SLinus Torvalds 10711da177e4SLinus Torvalds length = -EINVAL; 10721da177e4SLinus Torvalds if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) 1073b77a493bSEric Paris goto out; 10741da177e4SLinus Torvalds 107544be2f65SRasmus Villemoes length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); 1076b77a493bSEric Paris if (length) 1077b77a493bSEric Paris goto out; 1078b77a493bSEric Paris 107944be2f65SRasmus Villemoes length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); 1080b77a493bSEric Paris if (length) 1081b77a493bSEric Paris goto out; 10821da177e4SLinus Torvalds 10831da177e4SLinus Torvalds length = security_member_sid(ssid, tsid, tclass, &newsid); 1084b77a493bSEric Paris if (length) 1085b77a493bSEric Paris goto out; 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds length = security_sid_to_context(newsid, &newcon, &len); 1088b77a493bSEric Paris if (length) 1089b77a493bSEric Paris goto out; 10901da177e4SLinus Torvalds 1091b77a493bSEric Paris length = -ERANGE; 10921da177e4SLinus Torvalds if (len > SIMPLE_TRANSACTION_LIMIT) { 1093744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " 1094744ba35eSEric Paris "payload max\n", __func__, len); 1095b77a493bSEric Paris goto out; 10961da177e4SLinus Torvalds } 10971da177e4SLinus Torvalds 10981da177e4SLinus Torvalds memcpy(buf, newcon, len); 10991da177e4SLinus Torvalds length = len; 11001da177e4SLinus Torvalds out: 1101b77a493bSEric Paris kfree(newcon); 1102b77a493bSEric Paris kfree(tcon); 11031da177e4SLinus Torvalds kfree(scon); 11041da177e4SLinus Torvalds return length; 11051da177e4SLinus Torvalds } 11061da177e4SLinus Torvalds 11071da177e4SLinus Torvalds static struct inode *sel_make_inode(struct super_block *sb, int mode) 11081da177e4SLinus Torvalds { 11091da177e4SLinus Torvalds struct inode *ret = new_inode(sb); 11101da177e4SLinus Torvalds 11111da177e4SLinus Torvalds if (ret) { 11121da177e4SLinus Torvalds ret->i_mode = mode; 11131da177e4SLinus Torvalds ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; 11141da177e4SLinus Torvalds } 11151da177e4SLinus Torvalds return ret; 11161da177e4SLinus Torvalds } 11171da177e4SLinus Torvalds 11181da177e4SLinus Torvalds static ssize_t sel_read_bool(struct file *filep, char __user *buf, 11191da177e4SLinus Torvalds size_t count, loff_t *ppos) 11201da177e4SLinus Torvalds { 11211da177e4SLinus Torvalds char *page = NULL; 11221da177e4SLinus Torvalds ssize_t length; 11231da177e4SLinus Torvalds ssize_t ret; 11241da177e4SLinus Torvalds int cur_enforcing; 1125496ad9aaSAl Viro unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; 1126d313f948SStephen Smalley const char *name = filep->f_path.dentry->d_name.name; 11271da177e4SLinus Torvalds 1128bb003079SIngo Molnar mutex_lock(&sel_mutex); 11291da177e4SLinus Torvalds 1130d313f948SStephen Smalley ret = -EINVAL; 1131b77a493bSEric Paris if (index >= bool_num || strcmp(name, bool_pending_names[index])) 1132d313f948SStephen Smalley goto out; 11331da177e4SLinus Torvalds 11341da177e4SLinus Torvalds ret = -ENOMEM; 1135b77a493bSEric Paris page = (char *)get_zeroed_page(GFP_KERNEL); 1136b77a493bSEric Paris if (!page) 11371da177e4SLinus Torvalds goto out; 11381da177e4SLinus Torvalds 1139d313f948SStephen Smalley cur_enforcing = security_get_bool_value(index); 11401da177e4SLinus Torvalds if (cur_enforcing < 0) { 11411da177e4SLinus Torvalds ret = cur_enforcing; 11421da177e4SLinus Torvalds goto out; 11431da177e4SLinus Torvalds } 11441da177e4SLinus Torvalds length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, 1145d313f948SStephen Smalley bool_pending_values[index]); 114668bdcf28SStephen Smalley ret = simple_read_from_buffer(buf, count, ppos, page, length); 11471da177e4SLinus Torvalds out: 1148bb003079SIngo Molnar mutex_unlock(&sel_mutex); 11491da177e4SLinus Torvalds free_page((unsigned long)page); 11501da177e4SLinus Torvalds return ret; 11511da177e4SLinus Torvalds } 11521da177e4SLinus Torvalds 11531da177e4SLinus Torvalds static ssize_t sel_write_bool(struct file *filep, const char __user *buf, 11541da177e4SLinus Torvalds size_t count, loff_t *ppos) 11551da177e4SLinus Torvalds { 11561da177e4SLinus Torvalds char *page = NULL; 1157d313f948SStephen Smalley ssize_t length; 11581da177e4SLinus Torvalds int new_value; 1159496ad9aaSAl Viro unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; 1160d313f948SStephen Smalley const char *name = filep->f_path.dentry->d_name.name; 11611da177e4SLinus Torvalds 1162bb003079SIngo Molnar mutex_lock(&sel_mutex); 11631da177e4SLinus Torvalds 11641da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETBOOL); 11651da177e4SLinus Torvalds if (length) 11661da177e4SLinus Torvalds goto out; 11671da177e4SLinus Torvalds 1168d313f948SStephen Smalley length = -EINVAL; 1169b77a493bSEric Paris if (index >= bool_num || strcmp(name, bool_pending_names[index])) 1170d313f948SStephen Smalley goto out; 1171d313f948SStephen Smalley 11721da177e4SLinus Torvalds length = -ENOMEM; 1173b77a493bSEric Paris if (count >= PAGE_SIZE) 11741da177e4SLinus Torvalds goto out; 1175d313f948SStephen Smalley 11761da177e4SLinus Torvalds /* No partial writes. */ 1177d313f948SStephen Smalley length = -EINVAL; 1178b77a493bSEric Paris if (*ppos != 0) 11791da177e4SLinus Torvalds goto out; 1180b77a493bSEric Paris 11811da177e4SLinus Torvalds length = -ENOMEM; 1182b77a493bSEric Paris page = (char *)get_zeroed_page(GFP_KERNEL); 1183b77a493bSEric Paris if (!page) 11841da177e4SLinus Torvalds goto out; 11851da177e4SLinus Torvalds 1186d313f948SStephen Smalley length = -EFAULT; 11871da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 11881da177e4SLinus Torvalds goto out; 11891da177e4SLinus Torvalds 11901da177e4SLinus Torvalds length = -EINVAL; 11911da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 11921da177e4SLinus Torvalds goto out; 11931da177e4SLinus Torvalds 11941da177e4SLinus Torvalds if (new_value) 11951da177e4SLinus Torvalds new_value = 1; 11961da177e4SLinus Torvalds 1197d313f948SStephen Smalley bool_pending_values[index] = new_value; 11981da177e4SLinus Torvalds length = count; 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds out: 1201bb003079SIngo Molnar mutex_unlock(&sel_mutex); 12021da177e4SLinus Torvalds free_page((unsigned long) page); 12031da177e4SLinus Torvalds return length; 12041da177e4SLinus Torvalds } 12051da177e4SLinus Torvalds 12069c2e08c5SArjan van de Ven static const struct file_operations sel_bool_ops = { 12071da177e4SLinus Torvalds .read = sel_read_bool, 12081da177e4SLinus Torvalds .write = sel_write_bool, 120957a62c23SArnd Bergmann .llseek = generic_file_llseek, 12101da177e4SLinus Torvalds }; 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds static ssize_t sel_commit_bools_write(struct file *filep, 12131da177e4SLinus Torvalds const char __user *buf, 12141da177e4SLinus Torvalds size_t count, loff_t *ppos) 12151da177e4SLinus Torvalds { 12161da177e4SLinus Torvalds char *page = NULL; 1217d313f948SStephen Smalley ssize_t length; 12181da177e4SLinus Torvalds int new_value; 12191da177e4SLinus Torvalds 1220bb003079SIngo Molnar mutex_lock(&sel_mutex); 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds length = task_has_security(current, SECURITY__SETBOOL); 12231da177e4SLinus Torvalds if (length) 12241da177e4SLinus Torvalds goto out; 12251da177e4SLinus Torvalds 12261da177e4SLinus Torvalds length = -ENOMEM; 1227b77a493bSEric Paris if (count >= PAGE_SIZE) 12281da177e4SLinus Torvalds goto out; 1229b77a493bSEric Paris 12301da177e4SLinus Torvalds /* No partial writes. */ 1231b77a493bSEric Paris length = -EINVAL; 1232b77a493bSEric Paris if (*ppos != 0) 12331da177e4SLinus Torvalds goto out; 1234b77a493bSEric Paris 12351da177e4SLinus Torvalds length = -ENOMEM; 1236b77a493bSEric Paris page = (char *)get_zeroed_page(GFP_KERNEL); 1237b77a493bSEric Paris if (!page) 12381da177e4SLinus Torvalds goto out; 12391da177e4SLinus Torvalds 1240d313f948SStephen Smalley length = -EFAULT; 12411da177e4SLinus Torvalds if (copy_from_user(page, buf, count)) 12421da177e4SLinus Torvalds goto out; 12431da177e4SLinus Torvalds 12441da177e4SLinus Torvalds length = -EINVAL; 12451da177e4SLinus Torvalds if (sscanf(page, "%d", &new_value) != 1) 12461da177e4SLinus Torvalds goto out; 12471da177e4SLinus Torvalds 1248b77a493bSEric Paris length = 0; 12491872981bSEric Paris if (new_value && bool_pending_values) 1250b77a493bSEric Paris length = security_set_bools(bool_num, bool_pending_values); 12511da177e4SLinus Torvalds 1252b77a493bSEric Paris if (!length) 12531da177e4SLinus Torvalds length = count; 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds out: 1256bb003079SIngo Molnar mutex_unlock(&sel_mutex); 12571da177e4SLinus Torvalds free_page((unsigned long) page); 12581da177e4SLinus Torvalds return length; 12591da177e4SLinus Torvalds } 12601da177e4SLinus Torvalds 12619c2e08c5SArjan van de Ven static const struct file_operations sel_commit_bools_ops = { 12621da177e4SLinus Torvalds .write = sel_commit_bools_write, 126357a62c23SArnd Bergmann .llseek = generic_file_llseek, 12641da177e4SLinus Torvalds }; 12651da177e4SLinus Torvalds 12660c92d7c7SChristopher J. PeBenito static void sel_remove_entries(struct dentry *de) 12671da177e4SLinus Torvalds { 1268ad52184bSAl Viro d_genocide(de); 1269ad52184bSAl Viro shrink_dcache_parent(de); 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds #define BOOL_DIR_NAME "booleans" 12731da177e4SLinus Torvalds 12741da177e4SLinus Torvalds static int sel_make_bools(void) 12751da177e4SLinus Torvalds { 1276b77a493bSEric Paris int i, ret; 12771da177e4SLinus Torvalds ssize_t len; 12781da177e4SLinus Torvalds struct dentry *dentry = NULL; 12791da177e4SLinus Torvalds struct dentry *dir = bool_dir; 12801da177e4SLinus Torvalds struct inode *inode = NULL; 12811da177e4SLinus Torvalds struct inode_security_struct *isec; 12821da177e4SLinus Torvalds char **names = NULL, *page; 12831da177e4SLinus Torvalds int num; 12841da177e4SLinus Torvalds int *values = NULL; 12851da177e4SLinus Torvalds u32 sid; 12861da177e4SLinus Torvalds 12871da177e4SLinus Torvalds /* remove any existing files */ 12888007f102SXiaotian Feng for (i = 0; i < bool_num; i++) 12898007f102SXiaotian Feng kfree(bool_pending_names[i]); 1290d313f948SStephen Smalley kfree(bool_pending_names); 12911da177e4SLinus Torvalds kfree(bool_pending_values); 1292154c50caSEric Paris bool_num = 0; 1293d313f948SStephen Smalley bool_pending_names = NULL; 129420c19e41SDavi Arnaut bool_pending_values = NULL; 12951da177e4SLinus Torvalds 12960c92d7c7SChristopher J. PeBenito sel_remove_entries(dir); 12971da177e4SLinus Torvalds 1298b77a493bSEric Paris ret = -ENOMEM; 12991872981bSEric Paris page = (char *)get_zeroed_page(GFP_KERNEL); 13001872981bSEric Paris if (!page) 1301b77a493bSEric Paris goto out; 13021da177e4SLinus Torvalds 13031da177e4SLinus Torvalds ret = security_get_bools(&num, &names, &values); 1304b77a493bSEric Paris if (ret) 13051da177e4SLinus Torvalds goto out; 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds for (i = 0; i < num; i++) { 1308b77a493bSEric Paris ret = -ENOMEM; 13091da177e4SLinus Torvalds dentry = d_alloc_name(dir, names[i]); 1310b77a493bSEric Paris if (!dentry) 1311b77a493bSEric Paris goto out; 13121da177e4SLinus Torvalds 1313b77a493bSEric Paris ret = -ENOMEM; 1314b77a493bSEric Paris inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); 1315b77a493bSEric Paris if (!inode) 1316b77a493bSEric Paris goto out; 1317b77a493bSEric Paris 13181da177e4SLinus Torvalds ret = -ENAMETOOLONG; 1319cc1dad71SAl Viro len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); 1320b77a493bSEric Paris if (len >= PAGE_SIZE) 1321b77a493bSEric Paris goto out; 1322b77a493bSEric Paris 13231da177e4SLinus Torvalds isec = (struct inode_security_struct *)inode->i_security; 13241872981bSEric Paris ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); 13251872981bSEric Paris if (ret) 1326b77a493bSEric Paris goto out; 1327b77a493bSEric Paris 13281da177e4SLinus Torvalds isec->sid = sid; 13291da177e4SLinus Torvalds isec->initialized = 1; 13301da177e4SLinus Torvalds inode->i_fop = &sel_bool_ops; 1331bce34bc0SJames Carter inode->i_ino = i|SEL_BOOL_INO_OFFSET; 13321da177e4SLinus Torvalds d_add(dentry, inode); 13331da177e4SLinus Torvalds } 13341da177e4SLinus Torvalds bool_num = num; 1335d313f948SStephen Smalley bool_pending_names = names; 13361da177e4SLinus Torvalds bool_pending_values = values; 1337b77a493bSEric Paris 1338b77a493bSEric Paris free_page((unsigned long)page); 1339b77a493bSEric Paris return 0; 13401da177e4SLinus Torvalds out: 13411da177e4SLinus Torvalds free_page((unsigned long)page); 1342b77a493bSEric Paris 13431da177e4SLinus Torvalds if (names) { 13449a5f04bfSJesper Juhl for (i = 0; i < num; i++) 13451da177e4SLinus Torvalds kfree(names[i]); 13461da177e4SLinus Torvalds kfree(names); 13471da177e4SLinus Torvalds } 134820c19e41SDavi Arnaut kfree(values); 13490c92d7c7SChristopher J. PeBenito sel_remove_entries(dir); 1350b77a493bSEric Paris 1351b77a493bSEric Paris return ret; 13521da177e4SLinus Torvalds } 13531da177e4SLinus Torvalds 13541da177e4SLinus Torvalds #define NULL_FILE_NAME "null" 13551da177e4SLinus Torvalds 1356765927b2SAl Viro struct path selinux_null; 13571da177e4SLinus Torvalds 13581da177e4SLinus Torvalds static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, 13591da177e4SLinus Torvalds size_t count, loff_t *ppos) 13601da177e4SLinus Torvalds { 13611da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 13621da177e4SLinus Torvalds ssize_t length; 13631da177e4SLinus Torvalds 13641da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); 13651da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 13661da177e4SLinus Torvalds } 13671da177e4SLinus Torvalds 13681da177e4SLinus Torvalds static ssize_t sel_write_avc_cache_threshold(struct file *file, 13691da177e4SLinus Torvalds const char __user *buf, 13701da177e4SLinus Torvalds size_t count, loff_t *ppos) 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds { 1373b77a493bSEric Paris char *page = NULL; 13741da177e4SLinus Torvalds ssize_t ret; 13751da177e4SLinus Torvalds int new_value; 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds ret = task_has_security(current, SECURITY__SETSECPARAM); 13781da177e4SLinus Torvalds if (ret) 1379b77a493bSEric Paris goto out; 1380b77a493bSEric Paris 1381b77a493bSEric Paris ret = -ENOMEM; 1382b77a493bSEric Paris if (count >= PAGE_SIZE) 1383b77a493bSEric Paris goto out; 1384b77a493bSEric Paris 1385b77a493bSEric Paris /* No partial writes. */ 1386b77a493bSEric Paris ret = -EINVAL; 1387b77a493bSEric Paris if (*ppos != 0) 1388b77a493bSEric Paris goto out; 1389b77a493bSEric Paris 1390b77a493bSEric Paris ret = -ENOMEM; 1391b77a493bSEric Paris page = (char *)get_zeroed_page(GFP_KERNEL); 1392b77a493bSEric Paris if (!page) 1393b77a493bSEric Paris goto out; 1394b77a493bSEric Paris 1395b77a493bSEric Paris ret = -EFAULT; 1396b77a493bSEric Paris if (copy_from_user(page, buf, count)) 1397b77a493bSEric Paris goto out; 1398b77a493bSEric Paris 1399b77a493bSEric Paris ret = -EINVAL; 1400b77a493bSEric Paris if (sscanf(page, "%u", &new_value) != 1) 1401b77a493bSEric Paris goto out; 1402b77a493bSEric Paris 14031da177e4SLinus Torvalds avc_cache_threshold = new_value; 1404b77a493bSEric Paris 14051da177e4SLinus Torvalds ret = count; 14061da177e4SLinus Torvalds out: 1407b77a493bSEric Paris free_page((unsigned long)page); 14081da177e4SLinus Torvalds return ret; 14091da177e4SLinus Torvalds } 14101da177e4SLinus Torvalds 14111da177e4SLinus Torvalds static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, 14121da177e4SLinus Torvalds size_t count, loff_t *ppos) 14131da177e4SLinus Torvalds { 14141da177e4SLinus Torvalds char *page; 1415b77a493bSEric Paris ssize_t length; 14161da177e4SLinus Torvalds 14171da177e4SLinus Torvalds page = (char *)__get_free_page(GFP_KERNEL); 1418b77a493bSEric Paris if (!page) 1419b77a493bSEric Paris return -ENOMEM; 1420b77a493bSEric Paris 1421b77a493bSEric Paris length = avc_get_hash_stats(page); 1422b77a493bSEric Paris if (length >= 0) 1423b77a493bSEric Paris length = simple_read_from_buffer(buf, count, ppos, page, length); 14241da177e4SLinus Torvalds free_page((unsigned long)page); 1425b77a493bSEric Paris 1426b77a493bSEric Paris return length; 14271da177e4SLinus Torvalds } 14281da177e4SLinus Torvalds 14299c2e08c5SArjan van de Ven static const struct file_operations sel_avc_cache_threshold_ops = { 14301da177e4SLinus Torvalds .read = sel_read_avc_cache_threshold, 14311da177e4SLinus Torvalds .write = sel_write_avc_cache_threshold, 143257a62c23SArnd Bergmann .llseek = generic_file_llseek, 14331da177e4SLinus Torvalds }; 14341da177e4SLinus Torvalds 14359c2e08c5SArjan van de Ven static const struct file_operations sel_avc_hash_stats_ops = { 14361da177e4SLinus Torvalds .read = sel_read_avc_hash_stats, 143757a62c23SArnd Bergmann .llseek = generic_file_llseek, 14381da177e4SLinus Torvalds }; 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 14411da177e4SLinus Torvalds static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) 14421da177e4SLinus Torvalds { 14431da177e4SLinus Torvalds int cpu; 14441da177e4SLinus Torvalds 14454f4b6c1aSRusty Russell for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { 14461da177e4SLinus Torvalds if (!cpu_possible(cpu)) 14471da177e4SLinus Torvalds continue; 14481da177e4SLinus Torvalds *idx = cpu + 1; 14491da177e4SLinus Torvalds return &per_cpu(avc_cache_stats, cpu); 14501da177e4SLinus Torvalds } 14511da177e4SLinus Torvalds return NULL; 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) 14551da177e4SLinus Torvalds { 14561da177e4SLinus Torvalds loff_t n = *pos - 1; 14571da177e4SLinus Torvalds 14581da177e4SLinus Torvalds if (*pos == 0) 14591da177e4SLinus Torvalds return SEQ_START_TOKEN; 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds return sel_avc_get_stat_idx(&n); 14621da177e4SLinus Torvalds } 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) 14651da177e4SLinus Torvalds { 14661da177e4SLinus Torvalds return sel_avc_get_stat_idx(pos); 14671da177e4SLinus Torvalds } 14681da177e4SLinus Torvalds 14691da177e4SLinus Torvalds static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) 14701da177e4SLinus Torvalds { 14711da177e4SLinus Torvalds struct avc_cache_stats *st = v; 14721da177e4SLinus Torvalds 14731da177e4SLinus Torvalds if (v == SEQ_START_TOKEN) 14741da177e4SLinus Torvalds seq_printf(seq, "lookups hits misses allocations reclaims " 14751da177e4SLinus Torvalds "frees\n"); 1476257313b2SLinus Torvalds else { 1477257313b2SLinus Torvalds unsigned int lookups = st->lookups; 1478257313b2SLinus Torvalds unsigned int misses = st->misses; 1479257313b2SLinus Torvalds unsigned int hits = lookups - misses; 1480257313b2SLinus Torvalds seq_printf(seq, "%u %u %u %u %u %u\n", lookups, 1481257313b2SLinus Torvalds hits, misses, st->allocations, 14821da177e4SLinus Torvalds st->reclaims, st->frees); 1483257313b2SLinus Torvalds } 14841da177e4SLinus Torvalds return 0; 14851da177e4SLinus Torvalds } 14861da177e4SLinus Torvalds 14871da177e4SLinus Torvalds static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) 14881da177e4SLinus Torvalds { } 14891da177e4SLinus Torvalds 14901996a109SJan Engelhardt static const struct seq_operations sel_avc_cache_stats_seq_ops = { 14911da177e4SLinus Torvalds .start = sel_avc_stats_seq_start, 14921da177e4SLinus Torvalds .next = sel_avc_stats_seq_next, 14931da177e4SLinus Torvalds .show = sel_avc_stats_seq_show, 14941da177e4SLinus Torvalds .stop = sel_avc_stats_seq_stop, 14951da177e4SLinus Torvalds }; 14961da177e4SLinus Torvalds 14971da177e4SLinus Torvalds static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) 14981da177e4SLinus Torvalds { 14991da177e4SLinus Torvalds return seq_open(file, &sel_avc_cache_stats_seq_ops); 15001da177e4SLinus Torvalds } 15011da177e4SLinus Torvalds 15029c2e08c5SArjan van de Ven static const struct file_operations sel_avc_cache_stats_ops = { 15031da177e4SLinus Torvalds .open = sel_open_avc_cache_stats, 15041da177e4SLinus Torvalds .read = seq_read, 15051da177e4SLinus Torvalds .llseek = seq_lseek, 15061da177e4SLinus Torvalds .release = seq_release, 15071da177e4SLinus Torvalds }; 15081da177e4SLinus Torvalds #endif 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds static int sel_make_avc_files(struct dentry *dir) 15111da177e4SLinus Torvalds { 1512b77a493bSEric Paris int i; 15131da177e4SLinus Torvalds static struct tree_descr files[] = { 15141da177e4SLinus Torvalds { "cache_threshold", 15151da177e4SLinus Torvalds &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, 15161da177e4SLinus Torvalds { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, 15171da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS 15181da177e4SLinus Torvalds { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, 15191da177e4SLinus Torvalds #endif 15201da177e4SLinus Torvalds }; 15211da177e4SLinus Torvalds 15226e20a64aSNicolas Kaiser for (i = 0; i < ARRAY_SIZE(files); i++) { 15231da177e4SLinus Torvalds struct inode *inode; 15241da177e4SLinus Torvalds struct dentry *dentry; 15251da177e4SLinus Torvalds 15261da177e4SLinus Torvalds dentry = d_alloc_name(dir, files[i].name); 1527b77a493bSEric Paris if (!dentry) 1528b77a493bSEric Paris return -ENOMEM; 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); 1531b77a493bSEric Paris if (!inode) 1532b77a493bSEric Paris return -ENOMEM; 1533b77a493bSEric Paris 15341da177e4SLinus Torvalds inode->i_fop = files[i].ops; 15356174eafcSJames Carter inode->i_ino = ++sel_last_ino; 15361da177e4SLinus Torvalds d_add(dentry, inode); 15371da177e4SLinus Torvalds } 1538b77a493bSEric Paris 1539b77a493bSEric Paris return 0; 15401da177e4SLinus Torvalds } 15411da177e4SLinus Torvalds 1542f0ee2e46SJames Carter static ssize_t sel_read_initcon(struct file *file, char __user *buf, 1543f0ee2e46SJames Carter size_t count, loff_t *ppos) 1544f0ee2e46SJames Carter { 1545f0ee2e46SJames Carter char *con; 1546f0ee2e46SJames Carter u32 sid, len; 1547f0ee2e46SJames Carter ssize_t ret; 1548f0ee2e46SJames Carter 1549496ad9aaSAl Viro sid = file_inode(file)->i_ino&SEL_INO_MASK; 1550f0ee2e46SJames Carter ret = security_sid_to_context(sid, &con, &len); 1551b77a493bSEric Paris if (ret) 1552f0ee2e46SJames Carter return ret; 1553f0ee2e46SJames Carter 1554f0ee2e46SJames Carter ret = simple_read_from_buffer(buf, count, ppos, con, len); 1555f0ee2e46SJames Carter kfree(con); 1556f0ee2e46SJames Carter return ret; 1557f0ee2e46SJames Carter } 1558f0ee2e46SJames Carter 1559f0ee2e46SJames Carter static const struct file_operations sel_initcon_ops = { 1560f0ee2e46SJames Carter .read = sel_read_initcon, 156157a62c23SArnd Bergmann .llseek = generic_file_llseek, 1562f0ee2e46SJames Carter }; 1563f0ee2e46SJames Carter 1564f0ee2e46SJames Carter static int sel_make_initcon_files(struct dentry *dir) 1565f0ee2e46SJames Carter { 1566b77a493bSEric Paris int i; 1567f0ee2e46SJames Carter 1568f0ee2e46SJames Carter for (i = 1; i <= SECINITSID_NUM; i++) { 1569f0ee2e46SJames Carter struct inode *inode; 1570f0ee2e46SJames Carter struct dentry *dentry; 1571f0ee2e46SJames Carter dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); 1572b77a493bSEric Paris if (!dentry) 1573b77a493bSEric Paris return -ENOMEM; 1574f0ee2e46SJames Carter 1575f0ee2e46SJames Carter inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1576b77a493bSEric Paris if (!inode) 1577b77a493bSEric Paris return -ENOMEM; 1578b77a493bSEric Paris 1579f0ee2e46SJames Carter inode->i_fop = &sel_initcon_ops; 1580f0ee2e46SJames Carter inode->i_ino = i|SEL_INITCON_INO_OFFSET; 1581f0ee2e46SJames Carter d_add(dentry, inode); 1582f0ee2e46SJames Carter } 1583b77a493bSEric Paris 1584b77a493bSEric Paris return 0; 1585f0ee2e46SJames Carter } 1586f0ee2e46SJames Carter 1587e47c8fc5SChristopher J. PeBenito static inline unsigned long sel_class_to_ino(u16 class) 1588e47c8fc5SChristopher J. PeBenito { 1589e47c8fc5SChristopher J. PeBenito return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; 1590e47c8fc5SChristopher J. PeBenito } 1591e47c8fc5SChristopher J. PeBenito 1592e47c8fc5SChristopher J. PeBenito static inline u16 sel_ino_to_class(unsigned long ino) 1593e47c8fc5SChristopher J. PeBenito { 159492ae9e82SEric Paris return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); 1595e47c8fc5SChristopher J. PeBenito } 1596e47c8fc5SChristopher J. PeBenito 1597e47c8fc5SChristopher J. PeBenito static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) 1598e47c8fc5SChristopher J. PeBenito { 1599e47c8fc5SChristopher J. PeBenito return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; 1600e47c8fc5SChristopher J. PeBenito } 1601e47c8fc5SChristopher J. PeBenito 1602e47c8fc5SChristopher J. PeBenito static inline u32 sel_ino_to_perm(unsigned long ino) 1603e47c8fc5SChristopher J. PeBenito { 1604e47c8fc5SChristopher J. PeBenito return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); 1605e47c8fc5SChristopher J. PeBenito } 1606e47c8fc5SChristopher J. PeBenito 1607e47c8fc5SChristopher J. PeBenito static ssize_t sel_read_class(struct file *file, char __user *buf, 1608e47c8fc5SChristopher J. PeBenito size_t count, loff_t *ppos) 1609e47c8fc5SChristopher J. PeBenito { 1610496ad9aaSAl Viro unsigned long ino = file_inode(file)->i_ino; 1611cc1dad71SAl Viro char res[TMPBUFLEN]; 1612cc1dad71SAl Viro ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); 1613cc1dad71SAl Viro return simple_read_from_buffer(buf, count, ppos, res, len); 1614e47c8fc5SChristopher J. PeBenito } 1615e47c8fc5SChristopher J. PeBenito 1616e47c8fc5SChristopher J. PeBenito static const struct file_operations sel_class_ops = { 1617e47c8fc5SChristopher J. PeBenito .read = sel_read_class, 161857a62c23SArnd Bergmann .llseek = generic_file_llseek, 1619e47c8fc5SChristopher J. PeBenito }; 1620e47c8fc5SChristopher J. PeBenito 1621e47c8fc5SChristopher J. PeBenito static ssize_t sel_read_perm(struct file *file, char __user *buf, 1622e47c8fc5SChristopher J. PeBenito size_t count, loff_t *ppos) 1623e47c8fc5SChristopher J. PeBenito { 1624496ad9aaSAl Viro unsigned long ino = file_inode(file)->i_ino; 1625cc1dad71SAl Viro char res[TMPBUFLEN]; 1626cc1dad71SAl Viro ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); 1627cc1dad71SAl Viro return simple_read_from_buffer(buf, count, ppos, res, len); 1628e47c8fc5SChristopher J. PeBenito } 1629e47c8fc5SChristopher J. PeBenito 1630e47c8fc5SChristopher J. PeBenito static const struct file_operations sel_perm_ops = { 1631e47c8fc5SChristopher J. PeBenito .read = sel_read_perm, 163257a62c23SArnd Bergmann .llseek = generic_file_llseek, 1633e47c8fc5SChristopher J. PeBenito }; 1634e47c8fc5SChristopher J. PeBenito 16353bb56b25SPaul Moore static ssize_t sel_read_policycap(struct file *file, char __user *buf, 16363bb56b25SPaul Moore size_t count, loff_t *ppos) 16373bb56b25SPaul Moore { 16383bb56b25SPaul Moore int value; 16393bb56b25SPaul Moore char tmpbuf[TMPBUFLEN]; 16403bb56b25SPaul Moore ssize_t length; 1641496ad9aaSAl Viro unsigned long i_ino = file_inode(file)->i_ino; 16423bb56b25SPaul Moore 16433bb56b25SPaul Moore value = security_policycap_supported(i_ino & SEL_INO_MASK); 16443bb56b25SPaul Moore length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); 16453bb56b25SPaul Moore 16463bb56b25SPaul Moore return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 16473bb56b25SPaul Moore } 16483bb56b25SPaul Moore 16493bb56b25SPaul Moore static const struct file_operations sel_policycap_ops = { 16503bb56b25SPaul Moore .read = sel_read_policycap, 165157a62c23SArnd Bergmann .llseek = generic_file_llseek, 16523bb56b25SPaul Moore }; 16533bb56b25SPaul Moore 1654e47c8fc5SChristopher J. PeBenito static int sel_make_perm_files(char *objclass, int classvalue, 1655e47c8fc5SChristopher J. PeBenito struct dentry *dir) 1656e47c8fc5SChristopher J. PeBenito { 1657b77a493bSEric Paris int i, rc, nperms; 1658e47c8fc5SChristopher J. PeBenito char **perms; 1659e47c8fc5SChristopher J. PeBenito 1660e47c8fc5SChristopher J. PeBenito rc = security_get_permissions(objclass, &perms, &nperms); 1661e47c8fc5SChristopher J. PeBenito if (rc) 1662b77a493bSEric Paris return rc; 1663e47c8fc5SChristopher J. PeBenito 1664e47c8fc5SChristopher J. PeBenito for (i = 0; i < nperms; i++) { 1665e47c8fc5SChristopher J. PeBenito struct inode *inode; 1666e47c8fc5SChristopher J. PeBenito struct dentry *dentry; 1667e47c8fc5SChristopher J. PeBenito 1668b77a493bSEric Paris rc = -ENOMEM; 1669e47c8fc5SChristopher J. PeBenito dentry = d_alloc_name(dir, perms[i]); 1670b77a493bSEric Paris if (!dentry) 1671b77a493bSEric Paris goto out; 1672e47c8fc5SChristopher J. PeBenito 1673e47c8fc5SChristopher J. PeBenito rc = -ENOMEM; 1674b77a493bSEric Paris inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1675b77a493bSEric Paris if (!inode) 1676b77a493bSEric Paris goto out; 1677b77a493bSEric Paris 1678e47c8fc5SChristopher J. PeBenito inode->i_fop = &sel_perm_ops; 1679e47c8fc5SChristopher J. PeBenito /* i+1 since perm values are 1-indexed */ 1680e47c8fc5SChristopher J. PeBenito inode->i_ino = sel_perm_to_ino(classvalue, i + 1); 1681e47c8fc5SChristopher J. PeBenito d_add(dentry, inode); 1682e47c8fc5SChristopher J. PeBenito } 1683b77a493bSEric Paris rc = 0; 1684b77a493bSEric Paris out: 1685e47c8fc5SChristopher J. PeBenito for (i = 0; i < nperms; i++) 1686e47c8fc5SChristopher J. PeBenito kfree(perms[i]); 1687e47c8fc5SChristopher J. PeBenito kfree(perms); 1688e47c8fc5SChristopher J. PeBenito return rc; 1689e47c8fc5SChristopher J. PeBenito } 1690e47c8fc5SChristopher J. PeBenito 1691e47c8fc5SChristopher J. PeBenito static int sel_make_class_dir_entries(char *classname, int index, 1692e47c8fc5SChristopher J. PeBenito struct dentry *dir) 1693e47c8fc5SChristopher J. PeBenito { 1694e47c8fc5SChristopher J. PeBenito struct dentry *dentry = NULL; 1695e47c8fc5SChristopher J. PeBenito struct inode *inode = NULL; 1696e47c8fc5SChristopher J. PeBenito int rc; 1697e47c8fc5SChristopher J. PeBenito 1698e47c8fc5SChristopher J. PeBenito dentry = d_alloc_name(dir, "index"); 1699b77a493bSEric Paris if (!dentry) 1700b77a493bSEric Paris return -ENOMEM; 1701e47c8fc5SChristopher J. PeBenito 1702e47c8fc5SChristopher J. PeBenito inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); 1703b77a493bSEric Paris if (!inode) 1704b77a493bSEric Paris return -ENOMEM; 1705e47c8fc5SChristopher J. PeBenito 1706e47c8fc5SChristopher J. PeBenito inode->i_fop = &sel_class_ops; 1707e47c8fc5SChristopher J. PeBenito inode->i_ino = sel_class_to_ino(index); 1708e47c8fc5SChristopher J. PeBenito d_add(dentry, inode); 1709e47c8fc5SChristopher J. PeBenito 1710a1c2aa1eSAl Viro dentry = sel_make_dir(dir, "perms", &last_class_ino); 1711a1c2aa1eSAl Viro if (IS_ERR(dentry)) 1712a1c2aa1eSAl Viro return PTR_ERR(dentry); 1713e47c8fc5SChristopher J. PeBenito 1714e47c8fc5SChristopher J. PeBenito rc = sel_make_perm_files(classname, index, dentry); 1715e47c8fc5SChristopher J. PeBenito 1716e47c8fc5SChristopher J. PeBenito return rc; 1717e47c8fc5SChristopher J. PeBenito } 1718e47c8fc5SChristopher J. PeBenito 1719e47c8fc5SChristopher J. PeBenito static int sel_make_classes(void) 1720e47c8fc5SChristopher J. PeBenito { 1721b77a493bSEric Paris int rc, nclasses, i; 1722e47c8fc5SChristopher J. PeBenito char **classes; 1723e47c8fc5SChristopher J. PeBenito 1724e47c8fc5SChristopher J. PeBenito /* delete any existing entries */ 1725ad52184bSAl Viro sel_remove_entries(class_dir); 1726e47c8fc5SChristopher J. PeBenito 1727e47c8fc5SChristopher J. PeBenito rc = security_get_classes(&classes, &nclasses); 1728b77a493bSEric Paris if (rc) 1729b77a493bSEric Paris return rc; 1730e47c8fc5SChristopher J. PeBenito 1731e47c8fc5SChristopher J. PeBenito /* +2 since classes are 1-indexed */ 1732e47c8fc5SChristopher J. PeBenito last_class_ino = sel_class_to_ino(nclasses + 2); 1733e47c8fc5SChristopher J. PeBenito 1734e47c8fc5SChristopher J. PeBenito for (i = 0; i < nclasses; i++) { 1735e47c8fc5SChristopher J. PeBenito struct dentry *class_name_dir; 1736e47c8fc5SChristopher J. PeBenito 1737a1c2aa1eSAl Viro class_name_dir = sel_make_dir(class_dir, classes[i], 1738e47c8fc5SChristopher J. PeBenito &last_class_ino); 1739a1c2aa1eSAl Viro if (IS_ERR(class_name_dir)) { 1740a1c2aa1eSAl Viro rc = PTR_ERR(class_name_dir); 1741b77a493bSEric Paris goto out; 1742a1c2aa1eSAl Viro } 1743e47c8fc5SChristopher J. PeBenito 1744e47c8fc5SChristopher J. PeBenito /* i+1 since class values are 1-indexed */ 1745e47c8fc5SChristopher J. PeBenito rc = sel_make_class_dir_entries(classes[i], i + 1, 1746e47c8fc5SChristopher J. PeBenito class_name_dir); 1747e47c8fc5SChristopher J. PeBenito if (rc) 1748b77a493bSEric Paris goto out; 1749e47c8fc5SChristopher J. PeBenito } 1750b77a493bSEric Paris rc = 0; 1751b77a493bSEric Paris out: 1752e47c8fc5SChristopher J. PeBenito for (i = 0; i < nclasses; i++) 1753e47c8fc5SChristopher J. PeBenito kfree(classes[i]); 1754e47c8fc5SChristopher J. PeBenito kfree(classes); 1755e47c8fc5SChristopher J. PeBenito return rc; 1756e47c8fc5SChristopher J. PeBenito } 1757e47c8fc5SChristopher J. PeBenito 17583bb56b25SPaul Moore static int sel_make_policycap(void) 17593bb56b25SPaul Moore { 17603bb56b25SPaul Moore unsigned int iter; 17613bb56b25SPaul Moore struct dentry *dentry = NULL; 17623bb56b25SPaul Moore struct inode *inode = NULL; 17633bb56b25SPaul Moore 17643bb56b25SPaul Moore sel_remove_entries(policycap_dir); 17653bb56b25SPaul Moore 17663bb56b25SPaul Moore for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { 17673bb56b25SPaul Moore if (iter < ARRAY_SIZE(policycap_names)) 17683bb56b25SPaul Moore dentry = d_alloc_name(policycap_dir, 17693bb56b25SPaul Moore policycap_names[iter]); 17703bb56b25SPaul Moore else 17713bb56b25SPaul Moore dentry = d_alloc_name(policycap_dir, "unknown"); 17723bb56b25SPaul Moore 17733bb56b25SPaul Moore if (dentry == NULL) 17743bb56b25SPaul Moore return -ENOMEM; 17753bb56b25SPaul Moore 17763bb56b25SPaul Moore inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); 17773bb56b25SPaul Moore if (inode == NULL) 17783bb56b25SPaul Moore return -ENOMEM; 17793bb56b25SPaul Moore 17803bb56b25SPaul Moore inode->i_fop = &sel_policycap_ops; 17813bb56b25SPaul Moore inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; 17823bb56b25SPaul Moore d_add(dentry, inode); 17833bb56b25SPaul Moore } 17843bb56b25SPaul Moore 17853bb56b25SPaul Moore return 0; 17863bb56b25SPaul Moore } 17873bb56b25SPaul Moore 1788a1c2aa1eSAl Viro static struct dentry *sel_make_dir(struct dentry *dir, const char *name, 17890dd4ae51SChristopher J. PeBenito unsigned long *ino) 17901da177e4SLinus Torvalds { 1791a1c2aa1eSAl Viro struct dentry *dentry = d_alloc_name(dir, name); 17921da177e4SLinus Torvalds struct inode *inode; 17931da177e4SLinus Torvalds 1794a1c2aa1eSAl Viro if (!dentry) 1795a1c2aa1eSAl Viro return ERR_PTR(-ENOMEM); 1796a1c2aa1eSAl Viro 1797a1c2aa1eSAl Viro inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); 1798a1c2aa1eSAl Viro if (!inode) { 1799a1c2aa1eSAl Viro dput(dentry); 1800a1c2aa1eSAl Viro return ERR_PTR(-ENOMEM); 1801a1c2aa1eSAl Viro } 1802b77a493bSEric Paris 18031da177e4SLinus Torvalds inode->i_op = &simple_dir_inode_operations; 18041da177e4SLinus Torvalds inode->i_fop = &simple_dir_operations; 18050dd4ae51SChristopher J. PeBenito inode->i_ino = ++(*ino); 180640e906f8SJames Morris /* directory inodes start off with i_nlink == 2 (for "." entry) */ 1807d8c76e6fSDave Hansen inc_nlink(inode); 18081da177e4SLinus Torvalds d_add(dentry, inode); 1809edb20fb5SJames Morris /* bump link count on parent directory, too */ 1810ce0b16ddSDavid Howells inc_nlink(d_inode(dir)); 1811b77a493bSEric Paris 1812a1c2aa1eSAl Viro return dentry; 18131da177e4SLinus Torvalds } 18141da177e4SLinus Torvalds 18151da177e4SLinus Torvalds static int sel_fill_super(struct super_block *sb, void *data, int silent) 18161da177e4SLinus Torvalds { 18171da177e4SLinus Torvalds int ret; 18181da177e4SLinus Torvalds struct dentry *dentry; 1819a1c2aa1eSAl Viro struct inode *inode; 18201da177e4SLinus Torvalds struct inode_security_struct *isec; 18211da177e4SLinus Torvalds 18221da177e4SLinus Torvalds static struct tree_descr selinux_files[] = { 18231da177e4SLinus Torvalds [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, 18241da177e4SLinus Torvalds [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, 1825ce9982d0SStephen Smalley [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, 18261da177e4SLinus Torvalds [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, 18271da177e4SLinus Torvalds [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, 18281da177e4SLinus Torvalds [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, 18291da177e4SLinus Torvalds [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, 18301da177e4SLinus Torvalds [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, 18311da177e4SLinus Torvalds [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, 18321da177e4SLinus Torvalds [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, 18331da177e4SLinus Torvalds [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, 18341da177e4SLinus Torvalds [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, 18351da177e4SLinus Torvalds [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, 18363f12070eSEric Paris [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, 18373f12070eSEric Paris [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, 183811904167SKaiGai Kohei [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, 183972e8c859SEric Paris [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, 1840f9df6458SAndrew Perepechko [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, 1841f9df6458SAndrew Perepechko S_IWUGO}, 18421da177e4SLinus Torvalds /* last one */ {""} 18431da177e4SLinus Torvalds }; 18441da177e4SLinus Torvalds ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); 18451da177e4SLinus Torvalds if (ret) 1846161ce45aSJames Morris goto err; 18471da177e4SLinus Torvalds 1848a1c2aa1eSAl Viro bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); 1849a1c2aa1eSAl Viro if (IS_ERR(bool_dir)) { 1850a1c2aa1eSAl Viro ret = PTR_ERR(bool_dir); 1851a1c2aa1eSAl Viro bool_dir = NULL; 1852161ce45aSJames Morris goto err; 1853a1c2aa1eSAl Viro } 18541da177e4SLinus Torvalds 1855b77a493bSEric Paris ret = -ENOMEM; 18561da177e4SLinus Torvalds dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); 1857b77a493bSEric Paris if (!dentry) 1858161ce45aSJames Morris goto err; 18591da177e4SLinus Torvalds 1860161ce45aSJames Morris ret = -ENOMEM; 1861b77a493bSEric Paris inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); 1862b77a493bSEric Paris if (!inode) 1863161ce45aSJames Morris goto err; 1864b77a493bSEric Paris 18656174eafcSJames Carter inode->i_ino = ++sel_last_ino; 18661da177e4SLinus Torvalds isec = (struct inode_security_struct *)inode->i_security; 18671da177e4SLinus Torvalds isec->sid = SECINITSID_DEVNULL; 18681da177e4SLinus Torvalds isec->sclass = SECCLASS_CHR_FILE; 18691da177e4SLinus Torvalds isec->initialized = 1; 18701da177e4SLinus Torvalds 18711da177e4SLinus Torvalds init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); 18721da177e4SLinus Torvalds d_add(dentry, inode); 1873765927b2SAl Viro selinux_null.dentry = dentry; 18741da177e4SLinus Torvalds 1875a1c2aa1eSAl Viro dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); 1876a1c2aa1eSAl Viro if (IS_ERR(dentry)) { 1877a1c2aa1eSAl Viro ret = PTR_ERR(dentry); 1878161ce45aSJames Morris goto err; 1879a1c2aa1eSAl Viro } 18801da177e4SLinus Torvalds 18811da177e4SLinus Torvalds ret = sel_make_avc_files(dentry); 18821da177e4SLinus Torvalds if (ret) 1883161ce45aSJames Morris goto err; 1884f0ee2e46SJames Carter 1885a1c2aa1eSAl Viro dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); 1886a1c2aa1eSAl Viro if (IS_ERR(dentry)) { 1887a1c2aa1eSAl Viro ret = PTR_ERR(dentry); 1888f0ee2e46SJames Carter goto err; 1889a1c2aa1eSAl Viro } 1890f0ee2e46SJames Carter 1891f0ee2e46SJames Carter ret = sel_make_initcon_files(dentry); 1892f0ee2e46SJames Carter if (ret) 1893f0ee2e46SJames Carter goto err; 1894f0ee2e46SJames Carter 1895a1c2aa1eSAl Viro class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); 1896a1c2aa1eSAl Viro if (IS_ERR(class_dir)) { 1897a1c2aa1eSAl Viro ret = PTR_ERR(class_dir); 1898a1c2aa1eSAl Viro class_dir = NULL; 1899e47c8fc5SChristopher J. PeBenito goto err; 1900a1c2aa1eSAl Viro } 1901e47c8fc5SChristopher J. PeBenito 1902a1c2aa1eSAl Viro policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); 1903a1c2aa1eSAl Viro if (IS_ERR(policycap_dir)) { 1904a1c2aa1eSAl Viro ret = PTR_ERR(policycap_dir); 1905a1c2aa1eSAl Viro policycap_dir = NULL; 1906e47c8fc5SChristopher J. PeBenito goto err; 1907a1c2aa1eSAl Viro } 1908b77a493bSEric Paris return 0; 1909161ce45aSJames Morris err: 1910744ba35eSEric Paris printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", 1911744ba35eSEric Paris __func__); 1912b77a493bSEric Paris return ret; 19131da177e4SLinus Torvalds } 19141da177e4SLinus Torvalds 1915fc14f2feSAl Viro static struct dentry *sel_mount(struct file_system_type *fs_type, 1916fc14f2feSAl Viro int flags, const char *dev_name, void *data) 19171da177e4SLinus Torvalds { 1918fc14f2feSAl Viro return mount_single(fs_type, flags, data, sel_fill_super); 19191da177e4SLinus Torvalds } 19201da177e4SLinus Torvalds 19211da177e4SLinus Torvalds static struct file_system_type sel_fs_type = { 19221da177e4SLinus Torvalds .name = "selinuxfs", 1923fc14f2feSAl Viro .mount = sel_mount, 19241da177e4SLinus Torvalds .kill_sb = kill_litter_super, 19251da177e4SLinus Torvalds }; 19261da177e4SLinus Torvalds 19271da177e4SLinus Torvalds struct vfsmount *selinuxfs_mount; 19281da177e4SLinus Torvalds 19291da177e4SLinus Torvalds static int __init init_sel_fs(void) 19301da177e4SLinus Torvalds { 19311da177e4SLinus Torvalds int err; 19321da177e4SLinus Torvalds 19331da177e4SLinus Torvalds if (!selinux_enabled) 19341da177e4SLinus Torvalds return 0; 19357a627e3bSGreg Kroah-Hartman 1936f9bb4882SEric W. Biederman err = sysfs_create_mount_point(fs_kobj, "selinux"); 1937f9bb4882SEric W. Biederman if (err) 1938f9bb4882SEric W. Biederman return err; 19397a627e3bSGreg Kroah-Hartman 19401da177e4SLinus Torvalds err = register_filesystem(&sel_fs_type); 19417a627e3bSGreg Kroah-Hartman if (err) { 1942f9bb4882SEric W. Biederman sysfs_remove_mount_point(fs_kobj, "selinux"); 1943b77a493bSEric Paris return err; 19447a627e3bSGreg Kroah-Hartman } 1945b77a493bSEric Paris 1946765927b2SAl Viro selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); 19471da177e4SLinus Torvalds if (IS_ERR(selinuxfs_mount)) { 19481da177e4SLinus Torvalds printk(KERN_ERR "selinuxfs: could not mount!\n"); 19491da177e4SLinus Torvalds err = PTR_ERR(selinuxfs_mount); 19501da177e4SLinus Torvalds selinuxfs_mount = NULL; 19511da177e4SLinus Torvalds } 1952b77a493bSEric Paris 19531da177e4SLinus Torvalds return err; 19541da177e4SLinus Torvalds } 19551da177e4SLinus Torvalds 19561da177e4SLinus Torvalds __initcall(init_sel_fs); 19571da177e4SLinus Torvalds 19581da177e4SLinus Torvalds #ifdef CONFIG_SECURITY_SELINUX_DISABLE 19591da177e4SLinus Torvalds void exit_sel_fs(void) 19601da177e4SLinus Torvalds { 1961f9bb4882SEric W. Biederman sysfs_remove_mount_point(fs_kobj, "selinux"); 1962423e0ab0STim Chen kern_unmount(selinuxfs_mount); 19631da177e4SLinus Torvalds unregister_filesystem(&sel_fs_type); 19641da177e4SLinus Torvalds } 19651da177e4SLinus Torvalds #endif 1966