Release 4.10 fs/proc/proc_sysctl.c

Directory: fs/proc
/*
 * /proc/sys support
 */
#include <linux/init.h>
#include <linux/sysctl.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/printk.h>
#include <linux/security.h>
#include <linux/sched.h>
#include <linux/namei.h>
#include <linux/mm.h>
#include <linux/module.h>
#include "internal.h"


static const struct dentry_operations proc_sys_dentry_operations;

static const struct file_operations proc_sys_file_operations;

static const struct inode_operations proc_sys_inode_operations;

static const struct file_operations proc_sys_dir_file_operations;

static const struct inode_operations proc_sys_dir_operations;

/* Support for permanently empty directories */


struct ctl_table sysctl_mount_point[] = {
	{ }
};



static bool is_empty_dir(struct ctl_table_header *head)
{
	return head->ctl_table[0].child == sysctl_mount_point;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 23 100.00% 1 100.00%
Total 23 100.00% 1 100.00%



static void set_empty_dir(struct ctl_dir *dir)
{
	dir->header.ctl_table[0].child = sysctl_mount_point;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static void clear_empty_dir(struct ctl_dir *dir)

{
	dir->header.ctl_table[0].child = NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



void proc_sys_poll_notify(struct ctl_table_poll *poll)
{
	if (!poll)
		return;

	atomic_inc(&poll->event);
	wake_up_interruptible(&poll->wait);
}

Contributors
Person Tokens Prop Commits CommitProp
lucas de marchi lucas de marchi 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%


static struct ctl_table root_table[] = {
	{
		.procname = "",
		.mode = S_IFDIR|S_IRUGO|S_IXUGO,
        },
	{ }
};

static struct ctl_table_root sysctl_table_root = {
	.default_set.dir.header = {
		{{.count = 1,
		  .nreg = 1,
		  .ctl_table = root_table }},
		.ctl_table_arg = root_table,
		.root = &sysctl_table_root,
		.set = &sysctl_table_root.default_set,
        },
};

static DEFINE_SPINLOCK(sysctl_lock);

static void drop_sysctl_table(struct ctl_table_header *header);
static int sysctl_follow_link(struct ctl_table_header **phead,
	struct ctl_table **pentry);
static int insert_links(struct ctl_table_header *head);
static void put_links(struct ctl_table_header *header);



static void sysctl_print_dir(struct ctl_dir *dir)
{
	if (dir->header.parent)
		sysctl_print_dir(dir->header.parent);
	pr_cont("%s/", dir->header.ctl_table[0].procname);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 41 93.18% 2 40.00%
al viro al viro 1 2.27% 1 20.00%
christoph hellwig christoph hellwig 1 2.27% 1 20.00%
andrew morton andrew morton 1 2.27% 1 20.00%
Total 44 100.00% 5 100.00%



static int namecmp(const char *name1, int len1, const char *name2, int len2)
{
	int minlen;
	int cmp;

	minlen = len1;
	if (minlen > len2)
		minlen = len2;

	cmp = memcmp(name1, name2, minlen);
	if (cmp == 0)
		cmp = len1 - len2;
	return cmp;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 63 92.65% 2 66.67%
al viro al viro 5 7.35% 1 33.33%
Total 68 100.00% 3 100.00%

/* Called under sysctl_lock */


static struct ctl_table *find_entry(struct ctl_table_header **phead,
	struct ctl_dir *dir, const char *name, int namelen)
{
	struct ctl_table_header *head;
	struct ctl_table *entry;
	struct rb_node *node = dir->root.rb_node;

	while (node)
	{
		struct ctl_node *ctl_node;
		const char *procname;
		int cmp;

		ctl_node = rb_entry(node, struct ctl_node, node);
		head = ctl_node->header;
		entry = &head->ctl_table[ctl_node - head->node];
		procname = entry->procname;

		cmp = namecmp(name, namelen, procname, strlen(procname));
		if (cmp < 0)
			node = node->rb_left;
		else if (cmp > 0)
			node = node->rb_right;
		else {
			*phead = head;
			return entry;
		}
	}
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 159 99.38% 4 80.00%
al viro al viro 1 0.62% 1 20.00%
Total 160 100.00% 5 100.00%



static int insert_entry(struct ctl_table_header *head, struct ctl_table *entry)
{
	struct rb_node *node = &head->node[entry - head->ctl_table].node;
	struct rb_node **p = &head->parent->root.rb_node;
	struct rb_node *parent = NULL;
	const char *name = entry->procname;
	int namelen = strlen(name);

	while (*p) {
		struct ctl_table_header *parent_head;
		struct ctl_table *parent_entry;
		struct ctl_node *parent_node;
		const char *parent_name;
		int cmp;

		parent = *p;
		parent_node = rb_entry(parent, struct ctl_node, node);
		parent_head = parent_node->header;
		parent_entry = &parent_head->ctl_table[parent_node - parent_head->node];
		parent_name = parent_entry->procname;

		cmp = namecmp(name, namelen, parent_name, strlen(parent_name));
		if (cmp < 0)
			p = &(*p)->rb_left;
		else if (cmp > 0)
			p = &(*p)->rb_right;
		else {
			pr_err("sysctl duplicate entry: ");
			sysctl_print_dir(head->parent);
			pr_cont("/%s\n", entry->procname);
			return -EEXIST;
		}
	}

	rb_link_node(node, parent, p);
	rb_insert_color(node, &head->parent->root);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 199 80.24% 3 42.86%
al viro al viro 33 13.31% 1 14.29%
michel lespinasse michel lespinasse 12 4.84% 1 14.29%
nick piggin nick piggin 2 0.81% 1 14.29%
andrew morton andrew morton 2 0.81% 1 14.29%
Total 248 100.00% 7 100.00%



static void erase_entry(struct ctl_table_header *head, struct ctl_table *entry)
{
	struct rb_node *node = &head->node[entry - head->ctl_table].node;

	rb_erase(node, &head->parent->root);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 44 93.62% 2 66.67%
al viro al viro 3 6.38% 1 33.33%
Total 47 100.00% 3 100.00%



static void init_header(struct ctl_table_header *head,
	struct ctl_table_root *root, struct ctl_table_set *set,
	struct ctl_node *node, struct ctl_table *table)
{
	head->ctl_table = table;
	head->ctl_table_arg = table;
	head->used = 0;
	head->count = 1;
	head->nreg = 1;
	head->unregistering = NULL;
	head->root = root;
	head->set = set;
	head->parent = NULL;
	head->node = node;
	if (node) {
		struct ctl_table *entry;
		for (entry = table; entry->procname; entry++, node++)
			node->header = head;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 116 93.55% 4 66.67%
al viro al viro 5 4.03% 1 16.67%
pavel emelianov pavel emelianov 3 2.42% 1 16.67%
Total 124 100.00% 6 100.00%



static void erase_header(struct ctl_table_header *head)
{
	struct ctl_table *entry;
	for (entry = head->ctl_table; entry->procname; entry++)
		erase_entry(head, entry);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 36 94.74% 3 75.00%
pavel emelianov pavel emelianov 2 5.26% 1 25.00%
Total 38 100.00% 4 100.00%



static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
{
	struct ctl_table *entry;
	int err;

	/* Is this a permanently empty directory? */
	if (is_empty_dir(&dir->header))
		return -EROFS;

	/* Am I creating a permanently empty directory? */
	if (header->ctl_table == sysctl_mount_point) {
		if (!RB_EMPTY_ROOT(&dir->root))
			return -EINVAL;
		set_empty_dir(dir);
	}

	dir->header.nreg++;
	header->parent = dir;
	err = insert_links(header);
	if (err)
		goto fail_links;
	for (entry = header->ctl_table; entry->procname; entry++) {
		err = insert_entry(header, entry);
		if (err)
			goto fail;
	}
	return 0;
fail:
	erase_header(header);
	put_links(header);
fail_links:
	if (header->ctl_table == sysctl_mount_point)
		clear_empty_dir(dir);
	header->parent = NULL;
	drop_sysctl_table(&dir->header);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 151 85.31% 5 71.43%
lucas de marchi lucas de marchi 20 11.30% 1 14.29%
pavel emelianov pavel emelianov 6 3.39% 1 14.29%
Total 177 100.00% 7 100.00%

/* called under sysctl_lock */


static int use_table(struct ctl_table_header *p)
{
	if (unlikely(p->unregistering))
		return 0;
	p->used++;
	return 1;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 19 61.29% 2 40.00%
lucas de marchi lucas de marchi 9 29.03% 1 20.00%
al viro al viro 2 6.45% 1 20.00%
miklos szeredi miklos szeredi 1 3.23% 1 20.00%
Total 31 100.00% 5 100.00%

/* called under sysctl_lock */


static void unuse_table(struct ctl_table_header *p)
{
	if (!--p->used)
		if (unlikely(p->unregistering))
			complete(p->unregistering);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 16 45.71% 2 50.00%
lucas de marchi lucas de marchi 15 42.86% 1 25.00%
al viro al viro 4 11.43% 1 25.00%
Total 35 100.00% 4 100.00%

/* called under sysctl_lock, will reacquire if has to wait */


static void start_unregistering(struct ctl_table_header *p)
{
	/*
         * if p->used is 0, nobody will ever touch that entry again;
         * we'll eliminate all paths to it before dropping sysctl_lock
         */
	if (unlikely(p->used)) {
		struct completion wait;
		init_completion(&wait);
		p->unregistering = &wait;
		spin_unlock(&sysctl_lock);
		wait_for_completion(&wait);
		spin_lock(&sysctl_lock);
	} else {
		/* anything non-NULL; we'll never dereference it */
		p->unregistering = ERR_PTR(-EINVAL);
	}
	/*
         * do not remove from the list until nobody holds it; walking the
         * list in do_sysctl() relies on that.
         */
	erase_header(p);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 59 75.64% 3 50.00%
lucas de marchi lucas de marchi 14 17.95% 1 16.67%
al viro al viro 4 5.13% 1 16.67%
adrian bunk adrian bunk 1 1.28% 1 16.67%
Total 78 100.00% 6 100.00%



static void sysctl_head_get(struct ctl_table_header *head)
{
	spin_lock(&sysctl_lock);
	head->count++;
	spin_unlock(&sysctl_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 26 92.86% 2 66.67%
al viro al viro 2 7.14% 1 33.33%
Total 28 100.00% 3 100.00%



void sysctl_head_put(struct ctl_table_header *head)
{
	spin_lock(&sysctl_lock);
	if (!--head->count)
		kfree_rcu(head, rcu);
	spin_unlock(&sysctl_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 31 83.78% 2 66.67%
al viro al viro 6 16.22% 1 33.33%
Total 37 100.00% 3 100.00%



static struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
{
	BUG_ON(!head);
	spin_lock(&sysctl_lock);
	if (!use_table(head))
		head = ERR_PTR(-ENOENT);
	spin_unlock(&sysctl_lock);
	return head;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 42 84.00% 2 50.00%
al viro al viro 5 10.00% 1 25.00%
prasad joshi prasad joshi 3 6.00% 1 25.00%
Total 50 100.00% 4 100.00%



static void sysctl_head_finish(struct ctl_table_header *head)
{
	if (!head)
		return;
	spin_lock(&sysctl_lock);
	unuse_table(head);
	spin_unlock(&sysctl_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 25 73.53% 2 50.00%
al viro al viro 7 20.59% 1 25.00%
nick piggin nick piggin 2 5.88% 1 25.00%
Total 34 100.00% 4 100.00%


static struct ctl_table_set *

lookup_header_set(struct ctl_table_root *root)
{
	struct ctl_table_set *set = &root->default_set;
	if (root->lookup)
		set = root->lookup(root);
	return set;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 39 95.12% 2 66.67%
al viro al viro 2 4.88% 1 33.33%
Total 41 100.00% 3 100.00%



static struct ctl_table *lookup_entry(struct ctl_table_header **phead,
				      struct ctl_dir *dir,
				      const char *name, int namelen)
{
	struct ctl_table_header *head;
	struct ctl_table *entry;

	spin_lock(&sysctl_lock);
	entry = find_entry(&head, dir, name, namelen);
	if (entry && use_table(head))
		*phead = head;
	else
		entry = NULL;
	spin_unlock(&sysctl_lock);
	return entry;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 72 84.71% 3 75.00%
al viro al viro 13 15.29% 1 25.00%
Total 85 100.00% 4 100.00%



static struct ctl_node *first_usable_entry(struct rb_node *node)
{
	struct ctl_node *ctl_node;

	for (;node; node = rb_next(node)) {
		ctl_node = rb_entry(node, struct ctl_node, node);
		if (use_table(ctl_node->header))
			return ctl_node;
	}
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 36 61.02% 5 83.33%
al viro al viro 23 38.98% 1 16.67%
Total 59 100.00% 6 100.00%



static void first_entry(struct ctl_dir *dir,
	struct ctl_table_header **phead, struct ctl_table **pentry)
{
	struct ctl_table_header *head = NULL;
	struct ctl_table *entry = NULL;
	struct ctl_node *ctl_node;

	spin_lock(&sysctl_lock);
	ctl_node = first_usable_entry(rb_first(&dir->root));
	spin_unlock(&sysctl_lock);
	if (ctl_node) {
		head = ctl_node->header;
		entry = &head->ctl_table[ctl_node - head->node];
	}
	*phead = head;
	*pentry = entry;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 98 95.15% 5 83.33%
al viro al viro 5 4.85% 1 16.67%
Total 103 100.00% 6 100.00%



static void next_entry(struct ctl_table_header **phead, struct ctl_table **pentry)
{
	struct ctl_table_header *head = *phead;
	struct ctl_table *entry = *pentry;
	struct ctl_node *ctl_node = &head->node[entry - head->ctl_table];

	spin_lock(&sysctl_lock);
	unuse_table(head);

	ctl_node = first_usable_entry(rb_next(&ctl_node->node));
	spin_unlock(&sysctl_lock);
	head = NULL;
	if (ctl_node) {
		head = ctl_node->header;
		entry = &head->ctl_table[ctl_node - head->node];
	}
	*phead = head;
	*pentry = entry;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 101 83.47% 5 71.43%
al viro al viro 19 15.70% 1 14.29%
pavel emelianov pavel emelianov 1 0.83% 1 14.29%
Total 121 100.00% 7 100.00%



void register_sysctl_root(struct ctl_table_root *root)
{
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 5 55.56% 2 66.67%
pavel emelianov pavel emelianov 4 44.44% 1 33.33%
Total 9 100.00% 3 100.00%

/*
 * sysctl_perm does NOT grant the superuser all rights automatically, because
 * some sysctl variables are readonly even to root.
 */



static int test_perm(int mode, int op)
{
	if (uid_eq(current_euid(), GLOBAL_ROOT_UID))
		mode >>= 6;
	else if (in_egroup_p(GLOBAL_ROOT_GID))
		mode >>= 3;
	if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
		return 0;
	return -EACCES;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 56 87.50% 3 75.00%
lucas de marchi lucas de marchi 8 12.50% 1 25.00%
Total 64 100.00% 4 100.00%



static int sysctl_perm(struct ctl_table_header *head, struct ctl_table *table, int op)
{
	struct ctl_table_root *root = head->root;
	int mode;

	if (root->permissions)
		mode = root->permissions(head, table);
	else
		mode = table->mode;

	return test_perm(mode, op);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 47 74.60% 3 60.00%
lucas de marchi lucas de marchi 14 22.22% 1 20.00%
al viro al viro 2 3.17% 1 20.00%
Total 63 100.00% 5 100.00%



static struct inode *proc_sys_make_inode(struct super_block *sb,
		struct ctl_table_header *head, struct ctl_table *table)
{
	struct ctl_table_root *root = head->root;
	struct inode *inode;
	struct proc_inode *ei;

	inode = new_inode(sb);
	if (!inode)
		goto out;

	inode->i_ino = get_next_ino();

	sysctl_head_get(head);
	ei = PROC_I(inode);
	ei->sysctl = head;
	ei->sysctl_entry = table;

	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
	inode->i_mode = table->mode;
	if (!S_ISDIR(table->mode)) {
		inode->i_mode |= S_IFREG;
		inode->i_op = &proc_sys_inode_operations;
		inode->i_fop = &proc_sys_file_operations;
	} else {
		inode->i_mode |= S_IFDIR;
		inode->i_op = &proc_sys_dir_operations;
		inode->i_fop = &proc_sys_dir_file_operations;
		if (is_empty_dir(head))
			make_empty_dir_inode(inode);
	}

	if (root->set_ownership)
		root->set_ownership(head, table, &inode->i_uid, &inode->i_gid);

out:
	return inode;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 137 65.24% 4 44.44%
dmitry torokhov dmitry torokhov 34 16.19% 1 11.11%
al viro al viro 22 10.48% 2 22.22%
miklos szeredi miklos szeredi 13 6.19% 1 11.11%
deepa dinamani deepa dinamani 4 1.90% 1 11.11%
Total 210 100.00% 9 100.00%



static struct ctl_table_header *grab_header(struct inode *inode)
{
	struct ctl_table_header *head = PROC_I(inode)->sysctl;
	if (!head)
		head = &sysctl_table_root.default_set.dir.header;
	return sysctl_head_grab(head);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 28 59.57% 5 71.43%
al viro al viro 12 25.53% 1 14.29%
christoph hellwig christoph hellwig 7 14.89% 1 14.29%
Total 47 100.00% 7 100.00%



static struct dentry *proc_sys_lookup(struct inode *dir, struct dentry *dentry,
					unsigned int flags)
{
	struct ctl_table_header *head = grab_header(dir);
	struct ctl_table_header *h = NULL;
	const struct qstr *name = &dentry->d_name;
	struct ctl_table *p;
	struct inode *inode;
	struct dentry *err = ERR_PTR(-ENOENT);
	struct ctl_dir *ctl_dir;
	int ret;

	if (IS_ERR(head))
		return ERR_CAST(head);

	ctl_dir = container_of(head, struct ctl_dir, header);

	p = lookup_entry(&h, ctl_dir, name->name, name->len);
	if (!p)
		goto out;

	if (S_ISLNK(p->mode)) {
		ret = sysctl_follow_link(&h, &p);
		err = ERR_PTR(ret);
		if (ret)
			goto out;
	}

	err = ERR_PTR(-ENOMEM);
	inode = proc_sys_make_inode(dir->i_sb, h ? h : head, p);
	if (!inode)
		goto out;

	err = NULL;
	d_set_d_op(dentry, &proc_sys_dentry_operations);
	d_add(dentry, inode);

out:
	if (h)
		sysctl_head_finish(h);
	sysctl_head_finish(head);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 183 77.22% 6 60.00%
al viro al viro 45 18.99% 3 30.00%
francesco ruggeri francesco ruggeri 9 3.80% 1 10.00%
Total 237 100.00% 10 100.00%



static ssize_t proc_sys_call_handler(struct file *filp, void __user *buf,
		size_t count, loff_t *ppos, int write)
{
	struct inode *inode = file_inode(filp);
	struct ctl_table_header *head = grab_header(inode);
	struct ctl_table *table = PROC_I(inode)->sysctl_entry;
	ssize_t error;
	size_t res;

	if (IS_ERR(head))
		return PTR_ERR(head);

	/*
         * At this point we know that the sysctl was not unregistered
         * and won't be until we finish.
         */
	error = -EPERM;
	if (sysctl_perm(head, table, write ? MAY_WRITE : MAY_READ))
		goto out;

	/* if that can happen at all, it should be -EINVAL, not -EISDIR */
	error = -EINVAL;
	if (!table->proc_handler)
		goto out;

	/* careful: calling conventions are nasty here */
	res = count;
	error = table->proc_handler(table, write, buf, &res, ppos);
	if (!error)
		error = res;
out:
	sysctl_head_finish(head);

	return error;
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 127 79.87% 2 33.33%
al viro al viro 26 16.35% 3 50.00%
miklos szeredi miklos szeredi 6 3.77% 1 16.67%
Total 159 100.00% 6 100.00%



static ssize_t proc_sys_read(struct file *filp, char __user *buf,
				size_t count, loff_t *ppos)
{
	return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 26 61.90% 2 50.00%
al viro al viro 10 23.81% 1 25.00%
christoph hellwig christoph hellwig 6 14.29% 1 25.00%
Total 42 100.00% 4 100.00%



static ssize_t proc_sys_write(struct file *filp, const char __user *buf,
				size_t count, loff_t *ppos)
{
	return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
eric w. biederman eric w. biederman 41 95.35% 2 66.67%
al viro al viro 2 4.65% 1 33.33%
Total 43 100.00% 3 100.00%



static int proc_sys_open(struct
	Person	Tokens	Prop	Commits	CommitProp
eric w. biederman	eric w. biederman	23	100.00%	1	100.00%
	Total	23	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 fs/proc/proc_sysctl.c

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