* 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/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>
return -EACCES;
return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
- SECCLASS_SECURITY, perms, NULL, NULL);
+ SECCLASS_SECURITY, perms, NULL);
}
enum sel_inos {
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_DISABLE, /* disable SELinux until next reboot */
+ SEL_AVC, /* AVC management directory */
+ SEL_MEMBER, /* compute polyinstantiation membership decision */
};
#define TMPBUFLEN 12
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)
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);
struct dentry *dir = bool_dir;
struct inode *inode = NULL;
struct inode_security_struct *isec;
- struct qstr qname;
char **names = NULL, *page;
int num;
int *values = NULL;
goto out;
for (i = 0; i < num; i++) {
- qname.name = names[i];
- qname.len = strlen(qname.name);
- qname.hash = full_name_hash(qname.name, qname.len);
- dentry = d_alloc(dir, &qname);
+ dentry = d_alloc_name(dir, names[i]);
if (!dentry) {
ret = -ENOMEM;
goto err;
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 qstr qname;
struct inode_security_struct *isec;
static struct tree_descr selinux_files[] = {
[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},
/* last one */ {""}
};
ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
if (ret)
return ret;
- qname.name = BOOL_DIR_NAME;
- qname.len = strlen(qname.name);
- qname.hash = full_name_hash(qname.name, qname.len);
- dentry = d_alloc(sb->s_root, &qname);
+ dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
if (!dentry)
return -ENOMEM;
if (ret)
goto out;
- qname.name = NULL_FILE_NAME;
- qname.len = strlen(qname.name);
- qname.hash = full_name_hash(qname.name, qname.len);
- dentry = d_alloc(sb->s_root, &qname);
+ dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
if (!dentry)
return -ENOMEM;
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);
git://git.onelab.eu / linux-2.6.git / blobdiff