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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /security/selinux/selinuxfs.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'security/selinux/selinuxfs.c')
-rw-r--r--security/selinux/selinuxfs.c1340
1 files changed, 1340 insertions, 0 deletions
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
new file mode 100644
index 000000000000..07221568b505
--- /dev/null
+++ b/security/selinux/selinuxfs.c
@@ -0,0 +1,1340 @@
+/* Updated: Karl MacMillan <kmacmillan@tresys.com>
+ *
+ * Added conditional policy language extensions
+ *
+ * Copyright (C) 2003 - 2004 Tresys Technology, LLC
+ * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/security.h>
+#include <linux/major.h>
+#include <linux/seq_file.h>
+#include <linux/percpu.h>
+#include <asm/uaccess.h>
+#include <asm/semaphore.h>
+
+/* selinuxfs pseudo filesystem for exporting the security policy API.
+ Based on the proc code and the fs/nfsd/nfsctl.c code. */
+
+#include "flask.h"
+#include "avc.h"
+#include "avc_ss.h"
+#include "security.h"
+#include "objsec.h"
+#include "conditional.h"
+
+unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
+
+static int __init checkreqprot_setup(char *str)
+{
+ selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
+ return 1;
+}
+__setup("checkreqprot=", checkreqprot_setup);
+
+
+static DECLARE_MUTEX(sel_sem);
+
+/* global data for booleans */
+static struct dentry *bool_dir = NULL;
+static int bool_num = 0;
+static int *bool_pending_values = NULL;
+
+extern void selnl_notify_setenforce(int val);
+
+/* Check whether a task is allowed to use a security operation. */
+static int task_has_security(struct task_struct *tsk,
+ u32 perms)
+{
+ struct task_security_struct *tsec;
+
+ tsec = tsk->security;
+ if (!tsec)
+ return -EACCES;
+
+ return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
+ SECCLASS_SECURITY, perms, NULL);
+}
+
+enum sel_inos {
+ SEL_ROOT_INO = 2,
+ SEL_LOAD, /* load policy */
+ SEL_ENFORCE, /* get or set enforcing status */
+ SEL_CONTEXT, /* validate context */
+ SEL_ACCESS, /* compute access decision */
+ SEL_CREATE, /* compute create labeling decision */
+ SEL_RELABEL, /* compute relabeling decision */
+ SEL_USER, /* compute reachable user contexts */
+ SEL_POLICYVERS, /* return policy version for this kernel */
+ SEL_COMMIT_BOOLS, /* commit new boolean values */
+ SEL_MLS, /* return if MLS policy is enabled */
+ SEL_DISABLE, /* disable SELinux until next reboot */
+ SEL_AVC, /* AVC management directory */
+ SEL_MEMBER, /* compute polyinstantiation membership decision */
+ SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
+};
+
+#define TMPBUFLEN 12
+static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char tmpbuf[TMPBUFLEN];
+ ssize_t length;
+
+ length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
+ return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
+static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
+ size_t count, loff_t *ppos)
+
+{
+ char *page;
+ ssize_t length;
+ int new_value;
+
+ if (count < 0 || 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;
+
+ if (new_value != selinux_enforcing) {
+ length = task_has_security(current, SECURITY__SETENFORCE);
+ if (length)
+ goto out;
+ selinux_enforcing = new_value;
+ if (selinux_enforcing)
+ avc_ss_reset(0);
+ selnl_notify_setenforce(selinux_enforcing);
+ }
+ length = count;
+out:
+ free_page((unsigned long) page);
+ return length;
+}
+#else
+#define sel_write_enforce NULL
+#endif
+
+static struct file_operations sel_enforce_ops = {
+ .read = sel_read_enforce,
+ .write = sel_write_enforce,
+};
+
+#ifdef CONFIG_SECURITY_SELINUX_DISABLE
+static ssize_t sel_write_disable(struct file * file, const char __user * buf,
+ size_t count, loff_t *ppos)
+
+{
+ char *page;
+ ssize_t length;
+ int new_value;
+ extern int selinux_disable(void);
+
+ if (count < 0 || 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;
+
+ if (new_value) {
+ length = selinux_disable();
+ if (length < 0)
+ goto out;
+ }
+
+ length = count;
+out:
+ free_page((unsigned long) page);
+ return length;
+}
+#else
+#define sel_write_disable NULL
+#endif
+
+static 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)
+{
+ char tmpbuf[TMPBUFLEN];
+ ssize_t length;
+
+ length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
+ return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static struct file_operations sel_policyvers_ops = {
+ .read = sel_read_policyvers,
+};
+
+/* declaration for sel_write_load */
+static int sel_make_bools(void);
+
+static ssize_t sel_read_mls(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char tmpbuf[TMPBUFLEN];
+ ssize_t length;
+
+ length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
+ return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static struct file_operations sel_mls_ops = {
+ .read = sel_read_mls,
+};
+
+static ssize_t sel_write_load(struct file * file, const char __user * buf,
+ size_t count, loff_t *ppos)
+
+{
+ int ret;
+ ssize_t length;
+ void *data = NULL;
+
+ down(&sel_sem);
+
+ length = task_has_security(current, SECURITY__LOAD_POLICY);
+ if (length)
+ goto out;
+
+ if (*ppos != 0) {
+ /* No partial writes. */
+ length = -EINVAL;
+ goto out;
+ }
+
+ if ((count < 0) || (count > 64 * 1024 * 1024)
+ || (data = vmalloc(count)) == NULL) {
+ length = -ENOMEM;
+ goto out;
+ }
+
+ length = -EFAULT;
+ if (copy_from_user(data, buf, count) != 0)
+ goto out;
+
+ length = security_load_policy(data, count);
+ if (length)
+ goto out;
+
+ ret = sel_make_bools();
+ if (ret)
+ length = ret;
+ else
+ length = count;
+out:
+ up(&sel_sem);
+ vfree(data);
+ return length;
+}
+
+static struct file_operations sel_load_ops = {
+ .write = sel_write_load,
+};
+
+
+static ssize_t sel_write_context(struct file * file, const char __user * buf,
+ size_t count, loff_t *ppos)
+
+{
+ char *page;
+ u32 sid;
+ ssize_t length;
+
+ length = task_has_security(current, SECURITY__CHECK_CONTEXT);
+ if (length)
+ return length;
+
+ if (count < 0 || 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 = security_context_to_sid(page, count, &sid);
+ if (length < 0)
+ goto out;
+
+ length = count;
+out:
+ free_page((unsigned long) page);
+ return length;
+}
+
+static struct file_operations sel_context_ops = {
+ .write = sel_write_context,
+};
+
+static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char tmpbuf[TMPBUFLEN];
+ ssize_t length;
+
+ length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
+ return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
+ size_t count, loff_t *ppos)
+{
+ char *page;
+ ssize_t length;
+ unsigned int new_value;
+
+ length = task_has_security(current, SECURITY__SETCHECKREQPROT);
+ if (length)
+ return length;
+
+ if (count < 0 || 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, "%u", &new_value) != 1)
+ goto out;
+
+ selinux_checkreqprot = new_value ? 1 : 0;
+ length = count;
+out:
+ free_page((unsigned long) page);
+ return length;
+}
+static struct file_operations sel_checkreqprot_ops = {
+ .read = sel_read_checkreqprot,
+ .write = sel_write_checkreqprot,
+};
+
+/*
+ * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
+ */
+static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
+static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
+static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
+static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
+static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
+
+static ssize_t (*write_op[])(struct file *, char *, size_t) = {
+ [SEL_ACCESS] = sel_write_access,
+ [SEL_CREATE] = sel_write_create,
+ [SEL_RELABEL] = sel_write_relabel,
+ [SEL_USER] = sel_write_user,
+ [SEL_MEMBER] = sel_write_member,
+};
+
+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;
+ char *data;
+ ssize_t rv;
+
+ if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
+ return -EINVAL;
+
+ data = simple_transaction_get(file, buf, size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ rv = write_op[ino](file, data, size);
+ if (rv>0) {
+ simple_transaction_set(file, rv);
+ rv = size;
+ }
+ return rv;
+}
+
+static struct file_operations transaction_ops = {
+ .write = selinux_transaction_write,
+ .read = simple_transaction_read,
+ .release = simple_transaction_release,
+};
+
+/*
+ * payload - write methods
+ * If the method has a response, the response should be put in buf,
+ * and the length returned. Otherwise return 0 or and -error.
+ */
+
+static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
+{
+ char *scon, *tcon;
+ u32 ssid, tsid;
+ u16 tclass;
+ u32 req;
+ struct av_decision avd;
+ ssize_t length;
+
+ length = task_has_security(current, SECURITY__COMPUTE_AV);
+ if (length)
+ return length;
+
+ length = -ENOMEM;
+ scon = kmalloc(size+1, GFP_KERNEL);
+ if (!scon)
+ return length;
+ memset(scon, 0, size+1);
+
+ tcon = kmalloc(size+1, GFP_KERNEL);
+ if (!tcon)
+ goto out;
+ memset(tcon, 0, size+1);
+
+ length = -EINVAL;
+ if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
+ goto out2;
+
+ length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
+ if (length < 0)
+ goto out2;
+ length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
+ if (length < 0)
+ goto out2;
+
+ length = security_compute_av(ssid, tsid, tclass, req, &avd);
+ if (length < 0)
+ goto out2;
+
+ length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
+ "%x %x %x %x %u",
+ avd.allowed, avd.decided,
+ avd.auditallow, avd.auditdeny,
+ avd.seqno);
+out2:
+ kfree(tcon);
+out:
+ kfree(scon);
+ return length;
+}
+
+static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
+{
+ char *scon, *tcon;
+ u32 ssid, tsid, newsid;
+ u16 tclass;
+ ssize_t length;
+ char *newcon;
+ u32 len;
+
+ length = task_has_security(current, SECURITY__COMPUTE_CREATE);
+ if (length)
+ return length;
+
+ length = -ENOMEM;
+ scon = kmalloc(size+1, GFP_KERNEL);
+ if (!scon)
+ return length;
+ memset(scon, 0, size+1);
+
+ tcon = kmalloc(size+1, GFP_KERNEL);
+ if (!tcon)
+ goto out;
+ memset(tcon, 0, size+1);
+
+ length = -EINVAL;
+ if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
+ goto out2;
+
+ length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
+ if (length < 0)
+ goto out2;
+ length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
+ if (length < 0)
+ goto out2;
+
+ length = security_transition_sid(ssid, tsid, tclass, &newsid);
+ if (length < 0)
+ goto out2;
+
+ length = security_sid_to_context(newsid, &newcon, &len);
+ if (length < 0)
+ goto out2;
+
+ if (len > SIMPLE_TRANSACTION_LIMIT) {
+ printk(KERN_ERR "%s: context size (%u) exceeds payload "
+ "max\n", __FUNCTION__, len);
+ length = -ERANGE;
+ goto out3;
+ }
+
+ memcpy(buf, newcon, len);
+ length = len;
+out3:
+ kfree(newcon);
+out2:
+ kfree(tcon);
+out:
+ kfree(scon);
+ return length;
+}
+
+static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
+{
+ char *scon, *tcon;
+ u32 ssid, tsid, newsid;
+ u16 tclass;
+ ssize_t length;
+ char *newcon;
+ u32 len;
+
+ length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
+ if (length)
+ return length;
+
+ length = -ENOMEM;
+ scon = kmalloc(size+1, GFP_KERNEL);
+ if (!scon)
+ return length;
+ memset(scon, 0, size+1);
+
+ tcon = kmalloc(size+1, GFP_KERNEL);
+ if (!tcon)
+ goto out;
+ memset(tcon, 0, size+1);
+
+ length = -EINVAL;
+ if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
+ goto out2;
+
+ length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
+ if (length < 0)
+ goto out2;
+ length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
+ if (length < 0)
+ goto out2;
+
+ length = security_change_sid(ssid, tsid, tclass, &newsid);
+ if (length < 0)
+ goto out2;
+
+ length = security_sid_to_context(newsid, &newcon, &len);
+ if (length < 0)
+ goto out2;
+
+ if (len > SIMPLE_TRANSACTION_LIMIT) {
+ length = -ERANGE;
+ goto out3;
+ }
+
+ memcpy(buf, newcon, len);
+ length = len;
+out3:
+ kfree(newcon);
+out2:
+ kfree(tcon);
+out:
+ kfree(scon);
+ return length;
+}
+
+static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
+{
+ char *con, *user, *ptr;
+ u32 sid, *sids;
+ ssize_t length;
+ char *newcon;
+ int i, rc;
+ u32 len, nsids;
+
+ length = task_has_security(current, SECURITY__COMPUTE_USER);
+ if (length)
+ return length;
+
+ length = -ENOMEM;
+ con = kmalloc(size+1, GFP_KERNEL);
+ if (!con)
+ return length;
+ memset(con, 0, size+1);
+
+ user = kmalloc(size+1, GFP_KERNEL);
+ if (!user)
+ goto out;
+ memset(user, 0, size+1);
+
+ length = -EINVAL;
+ if (sscanf(buf, "%s %s", con, user) != 2)
+ goto out2;
+
+ length = security_context_to_sid(con, strlen(con)+1, &sid);
+ if (length < 0)
+ goto out2;
+
+ length = security_get_user_sids(sid, user, &sids, &nsids);
+ if (length < 0)
+ goto out2;
+
+ length = sprintf(buf, "%u", nsids) + 1;
+ ptr = buf + length;
+ for (i = 0; i < nsids; i++) {
+ rc = security_sid_to_context(sids[i], &newcon, &len);
+ if (rc) {
+ length = rc;
+ goto out3;
+ }
+ if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
+ kfree(newcon);
+ length = -ERANGE;
+ goto out3;
+ }
+ memcpy(ptr, newcon, len);
+ kfree(newcon);
+ ptr += len;
+ length += len;
+ }
+out3:
+ kfree(sids);
+out2:
+ kfree(user);
+out:
+ kfree(con);
+ return length;
+}
+
+static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
+{
+ char *scon, *tcon;
+ u32 ssid, tsid, newsid;
+ u16 tclass;
+ ssize_t length;
+ char *newcon;
+ u32 len;
+
+ length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
+ if (length)
+ return length;
+
+ length = -ENOMEM;
+ scon = kmalloc(size+1, GFP_KERNEL);
+ if (!scon)
+ return length;
+ memset(scon, 0, size+1);
+
+ tcon = kmalloc(size+1, GFP_KERNEL);
+ if (!tcon)
+ goto out;
+ memset(tcon, 0, size+1);
+
+ length = -EINVAL;
+ if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
+ goto out2;
+
+ length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
+ if (length < 0)
+ goto out2;
+ length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
+ if (length < 0)
+ goto out2;
+
+ length = security_member_sid(ssid, tsid, tclass, &newsid);
+ if (length < 0)
+ goto out2;
+
+ length = security_sid_to_context(newsid, &newcon, &len);
+ if (length < 0)
+ goto out2;
+
+ if (len > SIMPLE_TRANSACTION_LIMIT) {
+ printk(KERN_ERR "%s: context size (%u) exceeds payload "
+ "max\n", __FUNCTION__, len);
+ length = -ERANGE;
+ goto out3;
+ }
+
+ memcpy(buf, newcon, len);
+ length = len;
+out3:
+ kfree(newcon);
+out2:
+ kfree(tcon);
+out:
+ kfree(scon);
+ return length;
+}
+
+static struct inode *sel_make_inode(struct super_block *sb, int mode)
+{
+ struct inode *ret = new_inode(sb);
+
+ if (ret) {
+ ret->i_mode = mode;
+ ret->i_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)
+{
+ char *page = NULL;
+ ssize_t length;
+ ssize_t end;
+ ssize_t ret;
+ int cur_enforcing;
+ struct inode *inode;
+
+ down(&sel_sem);
+
+ ret = -EFAULT;
+
+ /* check to see if this file has been deleted */
+ if (!filep->f_op)
+ goto out;
+
+ if (count < 0 || count > PAGE_SIZE) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ inode = filep->f_dentry->d_inode;
+ cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
+ 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]);
+ if (length < 0) {
+ ret = length;
+ goto out;
+ }
+
+ if (*ppos >= length) {
+ ret = 0;
+ goto out;
+ }
+ if (count + *ppos > length)
+ count = length - *ppos;
+ end = count + *ppos;
+ if (copy_to_user(buf, (char *) page + *ppos, count)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ *ppos = end;
+ ret = count;
+out:
+ up(&sel_sem);
+ if (page)
+ free_page((unsigned long)page);
+ return ret;
+}
+
+static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char *page = NULL;
+ ssize_t length = -EFAULT;
+ int new_value;
+ struct inode *inode;
+
+ down(&sel_sem);
+
+ length = task_has_security(current, SECURITY__SETBOOL);
+ if (length)
+ goto out;
+
+ /* check to see if this file has been deleted */
+ if (!filep->f_op)
+ goto out;
+
+ if (count < 0 || count >= PAGE_SIZE) {
+ length = -ENOMEM;
+ goto out;
+ }
+ if (*ppos != 0) {
+ /* No partial writes. */
+ goto out;
+ }
+ page = (char*)get_zeroed_page(GFP_KERNEL);
+ if (!page) {
+ length = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(page, buf, count))
+ goto out;
+
+ length = -EINVAL;
+ if (sscanf(page, "%d", &new_value) != 1)
+ goto out;
+
+ if (new_value)
+ new_value = 1;
+
+ inode = filep->f_dentry->d_inode;
+ bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
+ length = count;
+
+out:
+ up(&sel_sem);
+ if (page)
+ free_page((unsigned long) page);
+ return length;
+}
+
+static struct file_operations sel_bool_ops = {
+ .read = sel_read_bool,
+ .write = sel_write_bool,
+};
+
+static ssize_t sel_commit_bools_write(struct file *filep,
+ const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char *page = NULL;
+ ssize_t length = -EFAULT;
+ int new_value;
+
+ down(&sel_sem);
+
+ length = task_has_security(current, SECURITY__SETBOOL);
+ if (length)
+ goto out;
+
+ /* check to see if this file has been deleted */
+ if (!filep->f_op)
+ goto out;
+
+ if (count < 0 || count >= PAGE_SIZE) {
+ length = -ENOMEM;
+ goto out;
+ }
+ if (*ppos != 0) {
+ /* No partial writes. */
+ goto out;
+ }
+ page = (char*)get_zeroed_page(GFP_KERNEL);
+ if (!page) {
+ length = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(page, buf, count))
+ goto out;
+
+ length = -EINVAL;
+ if (sscanf(page, "%d", &new_value) != 1)
+ goto out;
+
+ if (new_value) {
+ security_set_bools(bool_num, bool_pending_values);
+ }
+
+ length = count;
+
+out:
+ up(&sel_sem);
+ if (page)
+ free_page((unsigned long) page);
+ return length;
+}
+
+static 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)
+{
+ struct list_head *p, *node;
+ struct super_block *sb = de->d_sb;
+
+ spin_lock(&dcache_lock);
+ node = de->d_subdirs.next;
+ while (node != &de->d_subdirs) {
+ struct dentry *d = list_entry(node, struct dentry, d_child);
+ list_del_init(node);
+
+ if (d->d_inode) {
+ d = dget_locked(d);
+ spin_unlock(&dcache_lock);
+ d_delete(d);
+ simple_unlink(de->d_inode, d);
+ dput(d);
+ spin_lock(&dcache_lock);
+ }
+ node = de->d_subdirs.next;
+ }
+
+ spin_unlock(&dcache_lock);
+
+ file_list_lock();
+ list_for_each(p, &sb->s_files) {
+ struct file * filp = list_entry(p, struct file, f_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"
+
+static int sel_make_bools(void)
+{
+ int i, ret = 0;
+ ssize_t len;
+ struct dentry *dentry = NULL;
+ struct dentry *dir = bool_dir;
+ struct inode *inode = NULL;
+ struct inode_security_struct *isec;
+ char **names = NULL, *page;
+ int num;
+ int *values = NULL;
+ u32 sid;
+
+ /* remove any existing files */
+ if (bool_pending_values)
+ kfree(bool_pending_values);
+
+ sel_remove_bools(dir);
+
+ if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
+ return -ENOMEM;
+
+ ret = security_get_bools(&num, &names, &values);
+ if (ret != 0)
+ goto out;
+
+ for (i = 0; i < num; i++) {
+ dentry = d_alloc_name(dir, names[i]);
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
+ if (!inode) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
+ if (len < 0) {
+ ret = -EINVAL;
+ goto err;
+ } else if (len >= PAGE_SIZE) {
+ ret = -ENAMETOOLONG;
+ goto err;
+ }
+ isec = (struct inode_security_struct*)inode->i_security;
+ if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
+ goto err;
+ isec->sid = sid;
+ isec->initialized = 1;
+ inode->i_fop = &sel_bool_ops;
+ inode->i_ino = i + BOOL_INO_OFFSET;
+ d_add(dentry, inode);
+ }
+ bool_num = num;
+ bool_pending_values = values;
+out:
+ free_page((unsigned long)page);
+ if (names) {
+ for (i = 0; i < num; i++) {
+ if (names[i])
+ kfree(names[i]);
+ }
+ kfree(names);
+ }
+ return ret;
+err:
+ d_genocide(dir);
+ ret = -ENOMEM;
+ goto out;
+}
+
+#define NULL_FILE_NAME "null"
+
+struct dentry *selinux_null = NULL;
+
+static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char tmpbuf[TMPBUFLEN];
+ ssize_t length;
+
+ length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
+ return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static ssize_t sel_write_avc_cache_threshold(struct file * file,
+ const char __user * buf,
+ size_t count, loff_t *ppos)
+
+{
+ char *page;
+ ssize_t ret;
+ int new_value;
+
+ if (count < 0 || count >= PAGE_SIZE) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (*ppos != 0) {
+ /* No partial writes. */
+ ret = -EINVAL;
+ goto out;
+ }
+
+ page = (char*)get_zeroed_page(GFP_KERNEL);
+ if (!page) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(page, buf, count)) {
+ ret = -EFAULT;
+ goto out_free;
+ }
+
+ if (sscanf(page, "%u", &new_value) != 1) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (new_value != avc_cache_threshold) {
+ ret = task_has_security(current, SECURITY__SETSECPARAM);
+ if (ret)
+ goto out_free;
+ avc_cache_threshold = new_value;
+ }
+ ret = count;
+out_free:
+ free_page((unsigned long)page);
+out:
+ return ret;
+}
+
+static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ char *page;
+ ssize_t ret = 0;
+
+ page = (char *)__get_free_page(GFP_KERNEL);
+ if (!page) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = avc_get_hash_stats(page);
+ if (ret >= 0)
+ ret = simple_read_from_buffer(buf, count, ppos, page, ret);
+ free_page((unsigned long)page);
+out:
+ return ret;
+}
+
+static 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 = {
+ .read = sel_read_avc_hash_stats,
+};
+
+#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
+static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
+{
+ int cpu;
+
+ for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
+ if (!cpu_possible(cpu))
+ continue;
+ *idx = cpu + 1;
+ return &per_cpu(avc_cache_stats, cpu);
+ }
+ return NULL;
+}
+
+static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ loff_t n = *pos - 1;
+
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
+
+ return sel_avc_get_stat_idx(&n);
+}
+
+static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ return sel_avc_get_stat_idx(pos);
+}
+
+static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
+{
+ struct avc_cache_stats *st = v;
+
+ if (v == SEQ_START_TOKEN)
+ seq_printf(seq, "lookups hits misses allocations reclaims "
+ "frees\n");
+ else
+ seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
+ st->hits, st->misses, st->allocations,
+ st->reclaims, st->frees);
+ return 0;
+}
+
+static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
+{ }
+
+static struct seq_operations sel_avc_cache_stats_seq_ops = {
+ .start = sel_avc_stats_seq_start,
+ .next = sel_avc_stats_seq_next,
+ .show = sel_avc_stats_seq_show,
+ .stop = sel_avc_stats_seq_stop,
+};
+
+static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &sel_avc_cache_stats_seq_ops);
+}
+
+static struct file_operations sel_avc_cache_stats_ops = {
+ .open = sel_open_avc_cache_stats,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+#endif
+
+static int sel_make_avc_files(struct dentry *dir)
+{
+ int i, ret = 0;
+ static struct tree_descr files[] = {
+ { "cache_threshold",
+ &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
+ { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
+#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
+ { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
+#endif
+ };
+
+ for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) {
+ struct inode *inode;
+ struct dentry *dentry;
+
+ dentry = d_alloc_name(dir, files[i].name);
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
+ if (!inode) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ inode->i_fop = files[i].ops;
+ 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)
+{
+ int ret = 0;
+ struct inode *inode;
+
+ inode = sel_make_inode(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;
+ d_add(dentry, inode);
+out:
+ return ret;
+}
+
+static int sel_fill_super(struct super_block * sb, void * data, int silent)
+{
+ int ret;
+ struct dentry *dentry;
+ struct inode *inode;
+ struct inode_security_struct *isec;
+
+ static struct tree_descr selinux_files[] = {
+ [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
+ [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
+ [SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO},
+ [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
+ [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
+ [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
+ [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
+ [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
+ [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
+ [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
+ [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
+ [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
+ [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
+ /* last one */ {""}
+ };
+ ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
+ if (ret)
+ return ret;
+
+ dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
+ if (!dentry)
+ return -ENOMEM;
+
+ inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
+ if (!inode)
+ goto out;
+ inode->i_op = &simple_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ d_add(dentry, inode);
+ bool_dir = dentry;
+ ret = sel_make_bools();
+ if (ret)
+ goto out;
+
+ dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
+ if (!dentry)
+ return -ENOMEM;
+
+ inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
+ if (!inode)
+ goto out;
+ isec = (struct inode_security_struct*)inode->i_security;
+ isec->sid = SECINITSID_DEVNULL;
+ isec->sclass = SECCLASS_CHR_FILE;
+ isec->initialized = 1;
+
+ init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
+ d_add(dentry, inode);
+ selinux_null = dentry;
+
+ dentry = d_alloc_name(sb->s_root, "avc");
+ if (!dentry)
+ return -ENOMEM;
+
+ ret = sel_make_dir(sb, dentry);
+ if (ret)
+ goto out;
+
+ ret = sel_make_avc_files(dentry);
+ if (ret)
+ goto out;
+
+ return 0;
+out:
+ dput(dentry);
+ printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
+ return -ENOMEM;
+}
+
+static struct super_block *sel_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return get_sb_single(fs_type, flags, data, sel_fill_super);
+}
+
+static struct file_system_type sel_fs_type = {
+ .name = "selinuxfs",
+ .get_sb = sel_get_sb,
+ .kill_sb = kill_litter_super,
+};
+
+struct vfsmount *selinuxfs_mount;
+
+static int __init init_sel_fs(void)
+{
+ int err;
+
+ if (!selinux_enabled)
+ return 0;
+ err = register_filesystem(&sel_fs_type);
+ if (!err) {
+ selinuxfs_mount = kern_mount(&sel_fs_type);
+ if (IS_ERR(selinuxfs_mount)) {
+ printk(KERN_ERR "selinuxfs: could not mount!\n");
+ err = PTR_ERR(selinuxfs_mount);
+ selinuxfs_mount = NULL;
+ }
+ }
+ return err;
+}
+
+__initcall(init_sel_fs);
+
+#ifdef CONFIG_SECURITY_SELINUX_DISABLE
+void exit_sel_fs(void)
+{
+ unregister_filesystem(&sel_fs_type);
+}
+#endif

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