X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=security%2Fselinux%2Fselinuxfs.c;h=e5520996a75be16960c09324ac572e36de06eac2;hb=4f4b6c1a94a8735bbdc030a2911cf395495645b6;hp=1bfb40701b5a40b7b356c6aa0d1c5e47058e9588;hpb=161ce45a8a34ba81673f60c603e6fc6d37d99c8f;p=safe%2Fjmp%2Flinux-2.6 diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c index 1bfb407..e552099 100644 --- a/security/selinux/selinuxfs.c +++ b/security/selinux/selinuxfs.c @@ -1,15 +1,19 @@ /* Updated: Karl MacMillan * - * Added conditional policy language extensions + * Added conditional policy language extensions * + * Updated: Hewlett-Packard + * + * Added support for the policy capability bitmap + * + * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. * Copyright (C) 2003 - 2004 Tresys Technology, LLC * Copyright (C) 2004 Red Hat, Inc., James Morris * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by + * it under the terms of the GNU General Public License as published by * the Free Software Foundation, version 2. */ -#include #include #include #include @@ -22,8 +26,8 @@ #include #include #include -#include -#include +#include +#include /* selinuxfs pseudo filesystem for exporting the security policy API. Based on the proc code and the fs/nfsd/nfsctl.c code. */ @@ -35,22 +39,55 @@ #include "objsec.h" #include "conditional.h" +/* Policy capability filenames */ +static char *policycap_names[] = { + "network_peer_controls", + "open_perms" +}; + unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; +#ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT +#define SELINUX_COMPAT_NET_VALUE 0 +#else +#define SELINUX_COMPAT_NET_VALUE 1 +#endif + +int selinux_compat_net = SELINUX_COMPAT_NET_VALUE; + static int __init checkreqprot_setup(char *str) { - selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; + unsigned long checkreqprot; + if (!strict_strtoul(str, 0, &checkreqprot)) + selinux_checkreqprot = checkreqprot ? 1 : 0; return 1; } __setup("checkreqprot=", checkreqprot_setup); +static int __init selinux_compat_net_setup(char *str) +{ + unsigned long compat_net; + if (!strict_strtoul(str, 0, &compat_net)) + selinux_compat_net = compat_net ? 1 : 0; + return 1; +} +__setup("selinux_compat_net=", selinux_compat_net_setup); + static DEFINE_MUTEX(sel_mutex); /* global data for booleans */ -static struct dentry *bool_dir = NULL; -static int bool_num = 0; -static int *bool_pending_values = NULL; +static struct dentry *bool_dir; +static int bool_num; +static char **bool_pending_names; +static int *bool_pending_values; + +/* global data for classes */ +static struct dentry *class_dir; +static unsigned long last_class_ino; + +/* global data for policy capabilities */ +static struct dentry *policycap_dir; extern void selnl_notify_setenforce(int val); @@ -58,13 +95,18 @@ extern void selnl_notify_setenforce(int val); static int task_has_security(struct task_struct *tsk, u32 perms) { - struct task_security_struct *tsec; - - tsec = tsk->security; + const struct task_security_struct *tsec; + u32 sid = 0; + + rcu_read_lock(); + tsec = __task_cred(tsk)->security; + if (tsec) + sid = tsec->sid; + rcu_read_unlock(); if (!tsec) return -EACCES; - return avc_has_perm(tsec->sid, SECINITSID_SECURITY, + return avc_has_perm(sid, SECINITSID_SECURITY, SECCLASS_SECURITY, perms, NULL); } @@ -81,11 +123,22 @@ enum sel_inos { SEL_COMMIT_BOOLS, /* commit new boolean values */ SEL_MLS, /* return if MLS policy is enabled */ SEL_DISABLE, /* disable SELinux until next reboot */ - SEL_AVC, /* AVC management directory */ SEL_MEMBER, /* compute polyinstantiation membership decision */ SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ + SEL_COMPAT_NET, /* whether to use old compat network packet controls */ + SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ + SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ + SEL_INO_NEXT, /* The next inode number to use */ }; +static unsigned long sel_last_ino = SEL_INO_NEXT - 1; + +#define SEL_INITCON_INO_OFFSET 0x01000000 +#define SEL_BOOL_INO_OFFSET 0x02000000 +#define SEL_CLASS_INO_OFFSET 0x04000000 +#define SEL_POLICYCAP_INO_OFFSET 0x08000000 +#define SEL_INO_MASK 0x00ffffff + #define TMPBUFLEN 12 static ssize_t sel_read_enforce(struct file *filp, char __user *buf, size_t count, loff_t *ppos) @@ -98,7 +151,7 @@ static ssize_t sel_read_enforce(struct file *filp, char __user *buf, } #ifdef CONFIG_SECURITY_SELINUX_DEVELOP -static ssize_t sel_write_enforce(struct file * file, const char __user * buf, +static ssize_t sel_write_enforce(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -112,7 +165,7 @@ static ssize_t sel_write_enforce(struct file * file, const char __user * buf, /* No partial writes. */ return -EINVAL; } - page = (char*)get_zeroed_page(GFP_KERNEL); + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; length = -EFAULT; @@ -127,6 +180,11 @@ static ssize_t sel_write_enforce(struct file * file, const char __user * buf, length = task_has_security(current, SECURITY__SETENFORCE); if (length) goto out; + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, + "enforcing=%d old_enforcing=%d auid=%u ses=%u", + new_value, selinux_enforcing, + audit_get_loginuid(current), + audit_get_sessionid(current)); selinux_enforcing = new_value; if (selinux_enforcing) avc_ss_reset(0); @@ -141,13 +199,30 @@ out: #define sel_write_enforce NULL #endif -static struct file_operations sel_enforce_ops = { +static const struct file_operations sel_enforce_ops = { .read = sel_read_enforce, .write = sel_write_enforce, }; +static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + char tmpbuf[TMPBUFLEN]; + ssize_t length; + ino_t ino = filp->f_path.dentry->d_inode->i_ino; + int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? + security_get_reject_unknown() : !security_get_allow_unknown(); + + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_handle_unknown_ops = { + .read = sel_read_handle_unknown, +}; + #ifdef CONFIG_SECURITY_SELINUX_DISABLE -static ssize_t sel_write_disable(struct file * file, const char __user * buf, +static ssize_t sel_write_disable(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -162,7 +237,7 @@ static ssize_t sel_write_disable(struct file * file, const char __user * buf, /* No partial writes. */ return -EINVAL; } - page = (char*)get_zeroed_page(GFP_KERNEL); + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; length = -EFAULT; @@ -177,6 +252,10 @@ static ssize_t sel_write_disable(struct file * file, const char __user * buf, length = selinux_disable(); if (length < 0) goto out; + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, + "selinux=0 auid=%u ses=%u", + audit_get_loginuid(current), + audit_get_sessionid(current)); } length = count; @@ -188,12 +267,12 @@ out: #define sel_write_disable NULL #endif -static struct file_operations sel_disable_ops = { +static const struct file_operations sel_disable_ops = { .write = sel_write_disable, }; static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, - size_t count, loff_t *ppos) + size_t count, loff_t *ppos) { char tmpbuf[TMPBUFLEN]; ssize_t length; @@ -202,12 +281,18 @@ static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } -static struct file_operations sel_policyvers_ops = { +static const struct file_operations sel_policyvers_ops = { .read = sel_read_policyvers, }; /* declaration for sel_write_load */ static int sel_make_bools(void); +static int sel_make_classes(void); +static int sel_make_policycap(void); + +/* declaration for sel_make_class_dirs */ +static int sel_make_dir(struct inode *dir, struct dentry *dentry, + unsigned long *ino); static ssize_t sel_read_mls(struct file *filp, char __user *buf, size_t count, loff_t *ppos) @@ -219,11 +304,11 @@ static ssize_t sel_read_mls(struct file *filp, char __user *buf, return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } -static struct file_operations sel_mls_ops = { +static const struct file_operations sel_mls_ops = { .read = sel_read_mls, }; -static ssize_t sel_write_load(struct file * file, const char __user * buf, +static ssize_t sel_write_load(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -258,21 +343,39 @@ static ssize_t sel_write_load(struct file * file, const char __user * buf, goto out; ret = sel_make_bools(); + if (ret) { + length = ret; + goto out1; + } + + ret = sel_make_classes(); + if (ret) { + length = ret; + goto out1; + } + + ret = sel_make_policycap(); if (ret) length = ret; else length = count; + +out1: + audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, + "policy loaded auid=%u ses=%u", + audit_get_loginuid(current), + audit_get_sessionid(current)); out: mutex_unlock(&sel_mutex); vfree(data); return length; } -static struct file_operations sel_load_ops = { +static const struct file_operations sel_load_ops = { .write = sel_write_load, }; -static ssize_t sel_write_context(struct file * file, char *buf, size_t size) +static ssize_t sel_write_context(struct file *file, char *buf, size_t size) { char *canon; u32 sid, len; @@ -291,8 +394,8 @@ static ssize_t sel_write_context(struct file * file, char *buf, size_t size) return length; if (len > SIMPLE_TRANSACTION_LIMIT) { - printk(KERN_ERR "%s: context size (%u) exceeds payload " - "max\n", __FUNCTION__, len); + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); length = -ERANGE; goto out; } @@ -314,7 +417,7 @@ static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } -static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, +static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { char *page; @@ -331,7 +434,7 @@ static ssize_t sel_write_checkreqprot(struct file * file, const char __user * bu /* No partial writes. */ return -EINVAL; } - page = (char*)get_zeroed_page(GFP_KERNEL); + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) return -ENOMEM; length = -EFAULT; @@ -348,19 +451,68 @@ out: free_page((unsigned long) page); return length; } -static struct file_operations sel_checkreqprot_ops = { +static const struct file_operations sel_checkreqprot_ops = { .read = sel_read_checkreqprot, .write = sel_write_checkreqprot, }; +static ssize_t sel_read_compat_net(struct file *filp, char __user *buf, + size_t count, loff_t *ppos) +{ + char tmpbuf[TMPBUFLEN]; + ssize_t length; + + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net); + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static ssize_t sel_write_compat_net(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + char *page; + ssize_t length; + int new_value; + + length = task_has_security(current, SECURITY__LOAD_POLICY); + if (length) + return length; + + if (count >= PAGE_SIZE) + return -ENOMEM; + if (*ppos != 0) { + /* No partial writes. */ + return -EINVAL; + } + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + length = -EFAULT; + if (copy_from_user(page, buf, count)) + goto out; + + length = -EINVAL; + if (sscanf(page, "%d", &new_value) != 1) + goto out; + + selinux_compat_net = new_value ? 1 : 0; + length = count; +out: + free_page((unsigned long) page); + return length; +} +static const struct file_operations sel_compat_net_ops = { + .read = sel_read_compat_net, + .write = sel_write_compat_net, +}; + /* * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c */ -static ssize_t sel_write_access(struct file * file, char *buf, size_t size); -static ssize_t sel_write_create(struct file * file, char *buf, size_t size); -static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); -static ssize_t sel_write_user(struct file * file, char *buf, size_t size); -static ssize_t sel_write_member(struct file * file, char *buf, size_t size); +static ssize_t sel_write_access(struct file *file, char *buf, size_t size); +static ssize_t sel_write_create(struct file *file, char *buf, size_t size); +static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); +static ssize_t sel_write_user(struct file *file, char *buf, size_t size); +static ssize_t sel_write_member(struct file *file, char *buf, size_t size); static ssize_t (*write_op[])(struct file *, char *, size_t) = { [SEL_ACCESS] = sel_write_access, @@ -373,7 +525,7 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = { static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) { - ino_t ino = file->f_dentry->d_inode->i_ino; + ino_t ino = file->f_path.dentry->d_inode->i_ino; char *data; ssize_t rv; @@ -384,15 +536,15 @@ static ssize_t selinux_transaction_write(struct file *file, const char __user *b if (IS_ERR(data)) return PTR_ERR(data); - rv = write_op[ino](file, data, size); - if (rv>0) { + rv = write_op[ino](file, data, size); + if (rv > 0) { simple_transaction_set(file, rv); rv = size; } return rv; } -static struct file_operations transaction_ops = { +static const struct file_operations transaction_ops = { .write = selinux_transaction_write, .read = simple_transaction_read, .release = simple_transaction_release, @@ -404,7 +556,7 @@ static struct file_operations transaction_ops = { * and the length returned. Otherwise return 0 or and -error. */ -static ssize_t sel_write_access(struct file * file, char *buf, size_t size) +static ssize_t sel_write_access(struct file *file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid; @@ -453,7 +605,7 @@ out: return length; } -static ssize_t sel_write_create(struct file * file, char *buf, size_t size) +static ssize_t sel_write_create(struct file *file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid, newsid; @@ -495,8 +647,8 @@ static ssize_t sel_write_create(struct file * file, char *buf, size_t size) goto out2; if (len > SIMPLE_TRANSACTION_LIMIT) { - printk(KERN_ERR "%s: context size (%u) exceeds payload " - "max\n", __FUNCTION__, len); + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); length = -ERANGE; goto out3; } @@ -512,7 +664,7 @@ out: return length; } -static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) +static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid, newsid; @@ -569,7 +721,7 @@ out: return length; } -static ssize_t sel_write_user(struct file * file, char *buf, size_t size) +static ssize_t sel_write_user(struct file *file, char *buf, size_t size) { char *con, *user, *ptr; u32 sid, *sids; @@ -630,7 +782,7 @@ out: return length; } -static ssize_t sel_write_member(struct file * file, char *buf, size_t size) +static ssize_t sel_write_member(struct file *file, char *buf, size_t size) { char *scon, *tcon; u32 ssid, tsid, newsid; @@ -672,8 +824,8 @@ static ssize_t sel_write_member(struct file * file, char *buf, size_t size) goto out2; if (len > SIMPLE_TRANSACTION_LIMIT) { - printk(KERN_ERR "%s: context size (%u) exceeds payload " - "max\n", __FUNCTION__, len); + printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " + "payload max\n", __func__, len); length = -ERANGE; goto out3; } @@ -696,15 +848,12 @@ static struct inode *sel_make_inode(struct super_block *sb, int mode) if (ret) { ret->i_mode = mode; ret->i_uid = ret->i_gid = 0; - ret->i_blksize = PAGE_CACHE_SIZE; ret->i_blocks = 0; ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; } return ret; } -#define BOOL_INO_OFFSET 30 - static ssize_t sel_read_bool(struct file *filep, char __user *buf, size_t count, loff_t *ppos) { @@ -712,34 +861,34 @@ static ssize_t sel_read_bool(struct file *filep, char __user *buf, ssize_t length; ssize_t ret; int cur_enforcing; - struct inode *inode; + struct inode *inode = filep->f_path.dentry->d_inode; + unsigned index = inode->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; mutex_lock(&sel_mutex); - ret = -EFAULT; - - /* check to see if this file has been deleted */ - if (!filep->f_op) + if (index >= bool_num || strcmp(name, bool_pending_names[index])) { + ret = -EINVAL; goto out; + } if (count > PAGE_SIZE) { ret = -EINVAL; goto out; } - if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) { ret = -ENOMEM; goto out; } - inode = filep->f_dentry->d_inode; - cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); + cur_enforcing = security_get_bool_value(index); if (cur_enforcing < 0) { ret = cur_enforcing; goto out; } - length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, - bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); + bool_pending_values[index]); ret = simple_read_from_buffer(buf, count, ppos, page, length); out: mutex_unlock(&sel_mutex); @@ -752,9 +901,11 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, size_t count, loff_t *ppos) { char *page = NULL; - ssize_t length = -EFAULT; + ssize_t length; int new_value; - struct inode *inode; + struct inode *inode = filep->f_path.dentry->d_inode; + unsigned index = inode->i_ino & SEL_INO_MASK; + const char *name = filep->f_path.dentry->d_name.name; mutex_lock(&sel_mutex); @@ -762,24 +913,28 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (length) goto out; - /* check to see if this file has been deleted */ - if (!filep->f_op) + if (index >= bool_num || strcmp(name, bool_pending_names[index])) { + length = -EINVAL; goto out; + } if (count >= PAGE_SIZE) { length = -ENOMEM; goto out; } + if (*ppos != 0) { /* No partial writes. */ + length = -EINVAL; goto out; } - page = (char*)get_zeroed_page(GFP_KERNEL); + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) { length = -ENOMEM; goto out; } + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -790,8 +945,7 @@ static ssize_t sel_write_bool(struct file *filep, const char __user *buf, if (new_value) new_value = 1; - inode = filep->f_dentry->d_inode; - bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; + bool_pending_values[index] = new_value; length = count; out: @@ -801,9 +955,9 @@ out: return length; } -static struct file_operations sel_bool_ops = { - .read = sel_read_bool, - .write = sel_write_bool, +static const struct file_operations sel_bool_ops = { + .read = sel_read_bool, + .write = sel_write_bool, }; static ssize_t sel_commit_bools_write(struct file *filep, @@ -811,7 +965,7 @@ static ssize_t sel_commit_bools_write(struct file *filep, size_t count, loff_t *ppos) { char *page = NULL; - ssize_t length = -EFAULT; + ssize_t length; int new_value; mutex_lock(&sel_mutex); @@ -820,10 +974,6 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (length) goto out; - /* check to see if this file has been deleted */ - if (!filep->f_op) - goto out; - if (count >= PAGE_SIZE) { length = -ENOMEM; goto out; @@ -832,12 +982,13 @@ static ssize_t sel_commit_bools_write(struct file *filep, /* No partial writes. */ goto out; } - page = (char*)get_zeroed_page(GFP_KERNEL); + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) { length = -ENOMEM; goto out; } + length = -EFAULT; if (copy_from_user(page, buf, count)) goto out; @@ -845,9 +996,8 @@ static ssize_t sel_commit_bools_write(struct file *filep, if (sscanf(page, "%d", &new_value) != 1) goto out; - if (new_value && bool_pending_values) { + if (new_value && bool_pending_values) security_set_bools(bool_num, bool_pending_values); - } length = count; @@ -858,16 +1008,13 @@ out: return length; } -static struct file_operations sel_commit_bools_ops = { - .write = sel_commit_bools_write, +static const struct file_operations sel_commit_bools_ops = { + .write = sel_commit_bools_write, }; -/* delete booleans - partial revoke() from - * fs/proc/generic.c proc_kill_inodes */ -static void sel_remove_bools(struct dentry *de) +static void sel_remove_entries(struct dentry *de) { - struct list_head *p, *node; - struct super_block *sb = de->d_sb; + struct list_head *node; spin_lock(&dcache_lock); node = de->d_subdirs.next; @@ -887,18 +1034,6 @@ static void sel_remove_bools(struct dentry *de) } spin_unlock(&dcache_lock); - - file_list_lock(); - list_for_each(p, &sb->s_files) { - struct file * filp = list_entry(p, struct file, f_u.fu_list); - struct dentry * dentry = filp->f_dentry; - - if (dentry->d_parent != de) { - continue; - } - filp->f_op = NULL; - } - file_list_unlock(); } #define BOOL_DIR_NAME "booleans" @@ -917,12 +1052,15 @@ static int sel_make_bools(void) u32 sid; /* remove any existing files */ + kfree(bool_pending_names); kfree(bool_pending_values); + bool_pending_names = NULL; bool_pending_values = NULL; - sel_remove_bools(dir); + sel_remove_entries(dir); - if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) + page = (char *)get_zeroed_page(GFP_KERNEL); + if (!page) return -ENOMEM; ret = security_get_bools(&num, &names, &values); @@ -949,35 +1087,37 @@ static int sel_make_bools(void) ret = -ENAMETOOLONG; goto err; } - isec = (struct inode_security_struct*)inode->i_security; - if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) + isec = (struct inode_security_struct *)inode->i_security; + ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); + if (ret) goto err; isec->sid = sid; isec->initialized = 1; inode->i_fop = &sel_bool_ops; - inode->i_ino = i + BOOL_INO_OFFSET; + inode->i_ino = i|SEL_BOOL_INO_OFFSET; d_add(dentry, inode); } bool_num = num; + bool_pending_names = names; bool_pending_values = values; out: free_page((unsigned long)page); + return ret; +err: if (names) { for (i = 0; i < num; i++) kfree(names[i]); kfree(names); } - return ret; -err: kfree(values); - d_genocide(dir); + sel_remove_entries(dir); ret = -ENOMEM; goto out; } #define NULL_FILE_NAME "null" -struct dentry *selinux_null = NULL; +struct dentry *selinux_null; static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, size_t count, loff_t *ppos) @@ -989,8 +1129,8 @@ static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } -static ssize_t sel_write_avc_cache_threshold(struct file * file, - const char __user * buf, +static ssize_t sel_write_avc_cache_threshold(struct file *file, + const char __user *buf, size_t count, loff_t *ppos) { @@ -1009,7 +1149,7 @@ static ssize_t sel_write_avc_cache_threshold(struct file * file, goto out; } - page = (char*)get_zeroed_page(GFP_KERNEL); + page = (char *)get_zeroed_page(GFP_KERNEL); if (!page) { ret = -ENOMEM; goto out; @@ -1057,12 +1197,12 @@ out: return ret; } -static struct file_operations sel_avc_cache_threshold_ops = { +static const struct file_operations sel_avc_cache_threshold_ops = { .read = sel_read_avc_cache_threshold, .write = sel_write_avc_cache_threshold, }; -static struct file_operations sel_avc_hash_stats_ops = { +static const struct file_operations sel_avc_hash_stats_ops = { .read = sel_read_avc_hash_stats, }; @@ -1071,7 +1211,7 @@ static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) { int cpu; - for (cpu = *idx; cpu < NR_CPUS; ++cpu) { + for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { if (!cpu_possible(cpu)) continue; *idx = cpu + 1; @@ -1112,7 +1252,7 @@ static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) { } -static struct seq_operations sel_avc_cache_stats_seq_ops = { +static const struct seq_operations sel_avc_cache_stats_seq_ops = { .start = sel_avc_stats_seq_start, .next = sel_avc_stats_seq_next, .show = sel_avc_stats_seq_show, @@ -1124,7 +1264,7 @@ static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) return seq_open(file, &sel_avc_cache_stats_seq_ops); } -static struct file_operations sel_avc_cache_stats_ops = { +static const struct file_operations sel_avc_cache_stats_ops = { .open = sel_open_avc_cache_stats, .read = seq_read, .llseek = seq_lseek, @@ -1151,48 +1291,366 @@ static int sel_make_avc_files(struct dentry *dir) dentry = d_alloc_name(dir, files[i].name); if (!dentry) { ret = -ENOMEM; - goto err; + goto out; } inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); if (!inode) { ret = -ENOMEM; - goto err; + goto out; } inode->i_fop = files[i].ops; + inode->i_ino = ++sel_last_ino; d_add(dentry, inode); } out: return ret; -err: - d_genocide(dir); - goto out; } -static int sel_make_dir(struct super_block *sb, struct dentry *dentry) +static ssize_t sel_read_initcon(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct inode *inode; + char *con; + u32 sid, len; + ssize_t ret; + + inode = file->f_path.dentry->d_inode; + sid = inode->i_ino&SEL_INO_MASK; + ret = security_sid_to_context(sid, &con, &len); + if (ret < 0) + return ret; + + ret = simple_read_from_buffer(buf, count, ppos, con, len); + kfree(con); + return ret; +} + +static const struct file_operations sel_initcon_ops = { + .read = sel_read_initcon, +}; + +static int sel_make_initcon_files(struct dentry *dir) +{ + int i, ret = 0; + + for (i = 1; i <= SECINITSID_NUM; i++) { + struct inode *inode; + struct dentry *dentry; + dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); + if (!dentry) { + ret = -ENOMEM; + goto out; + } + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) { + ret = -ENOMEM; + goto out; + } + inode->i_fop = &sel_initcon_ops; + inode->i_ino = i|SEL_INITCON_INO_OFFSET; + d_add(dentry, inode); + } +out: + return ret; +} + +static inline unsigned int sel_div(unsigned long a, unsigned long b) +{ + return a / b - (a % b < 0); +} + +static inline unsigned long sel_class_to_ino(u16 class) +{ + return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; +} + +static inline u16 sel_ino_to_class(unsigned long ino) +{ + return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); +} + +static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) +{ + return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; +} + +static inline u32 sel_ino_to_perm(unsigned long ino) +{ + return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); +} + +static ssize_t sel_read_class(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t rc, len; + char *page; + unsigned long ino = file->f_path.dentry->d_inode->i_ino; + + page = (char *)__get_free_page(GFP_KERNEL); + if (!page) { + rc = -ENOMEM; + goto out; + } + + len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); + rc = simple_read_from_buffer(buf, count, ppos, page, len); + free_page((unsigned long)page); +out: + return rc; +} + +static const struct file_operations sel_class_ops = { + .read = sel_read_class, +}; + +static ssize_t sel_read_perm(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t rc, len; + char *page; + unsigned long ino = file->f_path.dentry->d_inode->i_ino; + + page = (char *)__get_free_page(GFP_KERNEL); + if (!page) { + rc = -ENOMEM; + goto out; + } + + len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); + rc = simple_read_from_buffer(buf, count, ppos, page, len); + free_page((unsigned long)page); +out: + return rc; +} + +static const struct file_operations sel_perm_ops = { + .read = sel_read_perm, +}; + +static ssize_t sel_read_policycap(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + int value; + char tmpbuf[TMPBUFLEN]; + ssize_t length; + unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; + + value = security_policycap_supported(i_ino & SEL_INO_MASK); + length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); + + return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); +} + +static const struct file_operations sel_policycap_ops = { + .read = sel_read_policycap, +}; + +static int sel_make_perm_files(char *objclass, int classvalue, + struct dentry *dir) +{ + int i, rc = 0, nperms; + char **perms; + + rc = security_get_permissions(objclass, &perms, &nperms); + if (rc) + goto out; + + for (i = 0; i < nperms; i++) { + struct inode *inode; + struct dentry *dentry; + + dentry = d_alloc_name(dir, perms[i]); + if (!dentry) { + rc = -ENOMEM; + goto out1; + } + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) { + rc = -ENOMEM; + goto out1; + } + inode->i_fop = &sel_perm_ops; + /* i+1 since perm values are 1-indexed */ + inode->i_ino = sel_perm_to_ino(classvalue, i+1); + d_add(dentry, inode); + } + +out1: + for (i = 0; i < nperms; i++) + kfree(perms[i]); + kfree(perms); +out: + return rc; +} + +static int sel_make_class_dir_entries(char *classname, int index, + struct dentry *dir) +{ + struct dentry *dentry = NULL; + struct inode *inode = NULL; + int rc; + + dentry = d_alloc_name(dir, "index"); + if (!dentry) { + rc = -ENOMEM; + goto out; + } + + inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); + if (!inode) { + rc = -ENOMEM; + goto out; + } + + inode->i_fop = &sel_class_ops; + inode->i_ino = sel_class_to_ino(index); + d_add(dentry, inode); + + dentry = d_alloc_name(dir, "perms"); + if (!dentry) { + rc = -ENOMEM; + goto out; + } + + rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); + if (rc) + goto out; + + rc = sel_make_perm_files(classname, index, dentry); + +out: + return rc; +} + +static void sel_remove_classes(void) +{ + struct list_head *class_node; + + list_for_each(class_node, &class_dir->d_subdirs) { + struct dentry *class_subdir = list_entry(class_node, + struct dentry, d_u.d_child); + struct list_head *class_subdir_node; + + list_for_each(class_subdir_node, &class_subdir->d_subdirs) { + struct dentry *d = list_entry(class_subdir_node, + struct dentry, d_u.d_child); + + if (d->d_inode) + if (d->d_inode->i_mode & S_IFDIR) + sel_remove_entries(d); + } + + sel_remove_entries(class_subdir); + } + + sel_remove_entries(class_dir); +} + +static int sel_make_classes(void) +{ + int rc = 0, nclasses, i; + char **classes; + + /* delete any existing entries */ + sel_remove_classes(); + + rc = security_get_classes(&classes, &nclasses); + if (rc < 0) + goto out; + + /* +2 since classes are 1-indexed */ + last_class_ino = sel_class_to_ino(nclasses+2); + + for (i = 0; i < nclasses; i++) { + struct dentry *class_name_dir; + + class_name_dir = d_alloc_name(class_dir, classes[i]); + if (!class_name_dir) { + rc = -ENOMEM; + goto out1; + } + + rc = sel_make_dir(class_dir->d_inode, class_name_dir, + &last_class_ino); + if (rc) + goto out1; + + /* i+1 since class values are 1-indexed */ + rc = sel_make_class_dir_entries(classes[i], i+1, + class_name_dir); + if (rc) + goto out1; + } + +out1: + for (i = 0; i < nclasses; i++) + kfree(classes[i]); + kfree(classes); +out: + return rc; +} + +static int sel_make_policycap(void) +{ + unsigned int iter; + struct dentry *dentry = NULL; + struct inode *inode = NULL; + + sel_remove_entries(policycap_dir); + + for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { + if (iter < ARRAY_SIZE(policycap_names)) + dentry = d_alloc_name(policycap_dir, + policycap_names[iter]); + else + dentry = d_alloc_name(policycap_dir, "unknown"); + + if (dentry == NULL) + return -ENOMEM; + + inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); + if (inode == NULL) + return -ENOMEM; + + inode->i_fop = &sel_policycap_ops; + inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; + d_add(dentry, inode); + } + + return 0; +} + +static int sel_make_dir(struct inode *dir, struct dentry *dentry, + unsigned long *ino) { int ret = 0; struct inode *inode; - inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); + inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); if (!inode) { ret = -ENOMEM; goto out; } inode->i_op = &simple_dir_inode_operations; inode->i_fop = &simple_dir_operations; + inode->i_ino = ++(*ino); /* directory inodes start off with i_nlink == 2 (for "." entry) */ - inode->i_nlink++; + inc_nlink(inode); d_add(dentry, inode); + /* bump link count on parent directory, too */ + inc_nlink(dir); out: return ret; } -static int sel_fill_super(struct super_block * sb, void * data, int silent) +static int sel_fill_super(struct super_block *sb, void *data, int silent) { int ret; struct dentry *dentry; - struct inode *inode; + struct inode *inode, *root_inode; struct inode_security_struct *isec; static struct tree_descr selinux_files[] = { @@ -1209,26 +1667,28 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, + [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR}, + [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, + [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, /* last one */ {""} }; ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); if (ret) goto err; + root_inode = sb->s_root->d_inode; + dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); if (!dentry) { ret = -ENOMEM; goto err; } - ret = sel_make_dir(sb, dentry); + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) goto err; bool_dir = dentry; - ret = sel_make_bools(); - if (ret) - goto err; dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); if (!dentry) { @@ -1241,7 +1701,8 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) ret = -ENOMEM; goto err; } - isec = (struct inode_security_struct*)inode->i_security; + inode->i_ino = ++sel_last_ino; + isec = (struct inode_security_struct *)inode->i_security; isec->sid = SECINITSID_DEVNULL; isec->sclass = SECCLASS_CHR_FILE; isec->initialized = 1; @@ -1256,24 +1717,65 @@ static int sel_fill_super(struct super_block * sb, void * data, int silent) goto err; } - ret = sel_make_dir(sb, dentry); + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); if (ret) goto err; ret = sel_make_avc_files(dentry); if (ret) goto err; + + dentry = d_alloc_name(sb->s_root, "initial_contexts"); + if (!dentry) { + ret = -ENOMEM; + goto err; + } + + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); + if (ret) + goto err; + + ret = sel_make_initcon_files(dentry); + if (ret) + goto err; + + dentry = d_alloc_name(sb->s_root, "class"); + if (!dentry) { + ret = -ENOMEM; + goto err; + } + + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); + if (ret) + goto err; + + class_dir = dentry; + + dentry = d_alloc_name(sb->s_root, "policy_capabilities"); + if (!dentry) { + ret = -ENOMEM; + goto err; + } + + ret = sel_make_dir(root_inode, dentry, &sel_last_ino); + if (ret) + goto err; + + policycap_dir = dentry; + out: return ret; err: - printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); + printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", + __func__); goto out; } -static struct super_block *sel_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) +static int sel_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data, + struct vfsmount *mnt) { - return get_sb_single(fs_type, flags, data, sel_fill_super); + return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); } static struct file_system_type sel_fs_type = {