[PATCH] sanitize proc_sysctl
* keep references to ctl_table_head and ctl_table in /proc/sys inodes * grab the former during operations, use the latter for access to entry if that succeeds * have ->d_compare() check if table should be seen for one who does lookup; that allows us to avoid flipping inodes - if we have the same name resolve to different things, we'll just keep several dentries and ->d_compare() will reject the wrong ones. * have ->lookup() and ->readdir() scan the table of our inode first, then walk all ctl_table_header and scan ->attached_by for those that are attached to our directory. * implement ->getattr(). * get rid of insane amounts of tree-walking * get rid of the need to know dentry in ->permission() and of the contortions induced by that. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
ae7edecc9b
commit
9043476f72
5 changed files with 219 additions and 236 deletions
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@ -17,6 +17,7 @@
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/smp_lock.h>
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#include <linux/sysctl.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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@ -65,6 +66,8 @@ static void proc_delete_inode(struct inode *inode)
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module_put(de->owner);
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de_put(de);
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}
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if (PROC_I(inode)->sysctl)
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sysctl_head_put(PROC_I(inode)->sysctl);
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clear_inode(inode);
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}
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@ -84,6 +87,8 @@ static struct inode *proc_alloc_inode(struct super_block *sb)
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ei->fd = 0;
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ei->op.proc_get_link = NULL;
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ei->pde = NULL;
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ei->sysctl = NULL;
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ei->sysctl_entry = NULL;
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inode = &ei->vfs_inode;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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return inode;
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@ -10,149 +10,110 @@
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static struct dentry_operations proc_sys_dentry_operations;
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static const struct file_operations proc_sys_file_operations;
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static const struct inode_operations proc_sys_inode_operations;
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static const struct file_operations proc_sys_dir_file_operations;
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static const struct inode_operations proc_sys_dir_operations;
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static void proc_sys_refresh_inode(struct inode *inode, struct ctl_table *table)
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{
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/* Refresh the cached information bits in the inode */
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if (table) {
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inode->i_uid = 0;
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inode->i_gid = 0;
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inode->i_mode = table->mode;
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if (table->proc_handler) {
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inode->i_mode |= S_IFREG;
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inode->i_nlink = 1;
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} else {
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inode->i_mode |= S_IFDIR;
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inode->i_nlink = 0; /* It is too hard to figure out */
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}
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}
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}
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static struct inode *proc_sys_make_inode(struct inode *dir, struct ctl_table *table)
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static struct inode *proc_sys_make_inode(struct super_block *sb,
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struct ctl_table_header *head, struct ctl_table *table)
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{
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struct inode *inode;
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struct proc_inode *dir_ei, *ei;
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int depth;
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struct proc_inode *ei;
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inode = new_inode(dir->i_sb);
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inode = new_inode(sb);
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if (!inode)
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goto out;
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/* A directory is always one deeper than it's parent */
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dir_ei = PROC_I(dir);
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depth = dir_ei->fd + 1;
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sysctl_head_get(head);
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ei = PROC_I(inode);
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ei->fd = depth;
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ei->sysctl = head;
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ei->sysctl_entry = table;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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inode->i_flags |= S_PRIVATE; /* tell selinux to ignore this inode */
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inode->i_mode = table->mode;
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if (!table->child) {
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inode->i_mode |= S_IFREG;
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inode->i_op = &proc_sys_inode_operations;
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inode->i_fop = &proc_sys_file_operations;
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inode->i_flags |= S_PRIVATE; /* tell selinux to ignore this inode */
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proc_sys_refresh_inode(inode, table);
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} else {
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inode->i_mode |= S_IFDIR;
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inode->i_nlink = 0;
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inode->i_op = &proc_sys_dir_operations;
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inode->i_fop = &proc_sys_dir_file_operations;
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}
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out:
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return inode;
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}
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static struct dentry *proc_sys_ancestor(struct dentry *dentry, int depth)
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{
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for (;;) {
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struct proc_inode *ei;
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ei = PROC_I(dentry->d_inode);
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if (ei->fd == depth)
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break; /* found */
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dentry = dentry->d_parent;
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}
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return dentry;
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}
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static struct ctl_table *proc_sys_lookup_table_one(struct ctl_table *table,
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struct qstr *name)
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static struct ctl_table *find_in_table(struct ctl_table *p, struct qstr *name)
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{
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int len;
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for ( ; table->ctl_name || table->procname; table++) {
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for ( ; p->ctl_name || p->procname; p++) {
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if (!table->procname)
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if (!p->procname)
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continue;
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len = strlen(table->procname);
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len = strlen(p->procname);
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if (len != name->len)
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continue;
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if (memcmp(table->procname, name->name, len) != 0)
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if (memcmp(p->procname, name->name, len) != 0)
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continue;
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/* I have a match */
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return table;
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return p;
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}
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return NULL;
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}
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static struct ctl_table *proc_sys_lookup_table(struct dentry *dentry,
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struct ctl_table *table)
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struct ctl_table_header *grab_header(struct inode *inode)
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{
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struct dentry *ancestor;
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struct proc_inode *ei;
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int depth, i;
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ei = PROC_I(dentry->d_inode);
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depth = ei->fd;
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if (depth == 0)
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return table;
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for (i = 1; table && (i <= depth); i++) {
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ancestor = proc_sys_ancestor(dentry, i);
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table = proc_sys_lookup_table_one(table, &ancestor->d_name);
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if (table)
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table = table->child;
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}
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return table;
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}
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static struct ctl_table *proc_sys_lookup_entry(struct dentry *dparent,
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struct qstr *name,
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struct ctl_table *table)
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{
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table = proc_sys_lookup_table(dparent, table);
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if (table)
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table = proc_sys_lookup_table_one(table, name);
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return table;
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}
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static struct ctl_table *do_proc_sys_lookup(struct dentry *parent,
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struct qstr *name,
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struct ctl_table_header **ptr)
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{
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struct ctl_table_header *head;
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struct ctl_table *table = NULL;
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for (head = sysctl_head_next(NULL); head;
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head = sysctl_head_next(head)) {
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table = proc_sys_lookup_entry(parent, name, head->ctl_table);
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if (table)
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break;
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}
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*ptr = head;
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return table;
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if (PROC_I(inode)->sysctl)
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return sysctl_head_grab(PROC_I(inode)->sysctl);
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else
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return sysctl_head_next(NULL);
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}
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static struct dentry *proc_sys_lookup(struct inode *dir, struct dentry *dentry,
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struct nameidata *nd)
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{
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struct ctl_table_header *head;
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struct ctl_table_header *head = grab_header(dir);
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struct ctl_table *table = PROC_I(dir)->sysctl_entry;
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struct ctl_table_header *h = NULL;
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struct qstr *name = &dentry->d_name;
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struct ctl_table *p;
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struct inode *inode;
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struct dentry *err;
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struct ctl_table *table;
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struct dentry *err = ERR_PTR(-ENOENT);
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err = ERR_PTR(-ENOENT);
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table = do_proc_sys_lookup(dentry->d_parent, &dentry->d_name, &head);
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if (!table)
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if (IS_ERR(head))
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return ERR_CAST(head);
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if (table && !table->child) {
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WARN_ON(1);
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goto out;
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}
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table = table ? table->child : head->ctl_table;
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p = find_in_table(table, name);
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if (!p) {
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for (h = sysctl_head_next(NULL); h; h = sysctl_head_next(h)) {
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if (h->attached_to != table)
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continue;
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p = find_in_table(h->attached_by, name);
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if (p)
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break;
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}
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}
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if (!p)
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goto out;
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err = ERR_PTR(-ENOMEM);
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inode = proc_sys_make_inode(dir, table);
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inode = proc_sys_make_inode(dir->i_sb, h ? h : head, p);
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if (h)
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sysctl_head_finish(h);
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if (!inode)
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goto out;
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@ -168,22 +129,14 @@ out:
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static ssize_t proc_sys_call_handler(struct file *filp, void __user *buf,
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size_t count, loff_t *ppos, int write)
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{
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struct dentry *dentry = filp->f_dentry;
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struct ctl_table_header *head;
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struct ctl_table *table;
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struct inode *inode = filp->f_path.dentry->d_inode;
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struct ctl_table_header *head = grab_header(inode);
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struct ctl_table *table = PROC_I(inode)->sysctl_entry;
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ssize_t error;
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size_t res;
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table = do_proc_sys_lookup(dentry->d_parent, &dentry->d_name, &head);
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/* Has the sysctl entry disappeared on us? */
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error = -ENOENT;
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if (!table)
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goto out;
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/* Has the sysctl entry been replaced by a directory? */
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error = -EISDIR;
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if (!table->proc_handler)
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goto out;
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if (IS_ERR(head))
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return PTR_ERR(head);
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/*
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* At this point we know that the sysctl was not unregistered
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@ -193,6 +146,11 @@ static ssize_t proc_sys_call_handler(struct file *filp, void __user *buf,
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if (sysctl_perm(head->root, table, write ? MAY_WRITE : MAY_READ))
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goto out;
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/* if that can happen at all, it should be -EINVAL, not -EISDIR */
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error = -EINVAL;
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if (!table->proc_handler)
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goto out;
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/* careful: calling conventions are nasty here */
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res = count;
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error = table->proc_handler(table, write, filp, buf, &res, ppos);
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@ -218,82 +176,86 @@ static ssize_t proc_sys_write(struct file *filp, const char __user *buf,
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static int proc_sys_fill_cache(struct file *filp, void *dirent,
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filldir_t filldir, struct ctl_table *table)
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filldir_t filldir,
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struct ctl_table_header *head,
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struct ctl_table *table)
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{
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struct ctl_table_header *head;
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struct ctl_table *child_table = NULL;
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struct dentry *child, *dir = filp->f_path.dentry;
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struct inode *inode;
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struct qstr qname;
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ino_t ino = 0;
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unsigned type = DT_UNKNOWN;
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int ret;
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qname.name = table->procname;
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qname.len = strlen(table->procname);
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qname.hash = full_name_hash(qname.name, qname.len);
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/* Suppress duplicates.
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* Only fill a directory entry if it is the value that
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* an ordinary lookup of that name returns. Hide all
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* others.
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*
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* If we ever cache this translation in the dcache
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* I should do a dcache lookup first. But for now
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* it is just simpler not to.
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*/
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ret = 0;
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child_table = do_proc_sys_lookup(dir, &qname, &head);
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sysctl_head_finish(head);
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if (child_table != table)
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return 0;
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child = d_lookup(dir, &qname);
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if (!child) {
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struct dentry *new;
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new = d_alloc(dir, &qname);
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if (new) {
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inode = proc_sys_make_inode(dir->d_inode, table);
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if (!inode)
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child = ERR_PTR(-ENOMEM);
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else {
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new->d_op = &proc_sys_dentry_operations;
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d_add(new, inode);
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child = d_alloc(dir, &qname);
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if (child) {
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inode = proc_sys_make_inode(dir->d_sb, head, table);
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if (!inode) {
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dput(child);
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return -ENOMEM;
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} else {
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child->d_op = &proc_sys_dentry_operations;
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d_add(child, inode);
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}
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if (child)
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dput(new);
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else
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child = new;
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} else {
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return -ENOMEM;
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}
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}
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if (!child || IS_ERR(child) || !child->d_inode)
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goto end_instantiate;
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inode = child->d_inode;
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if (inode) {
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ino = inode->i_ino;
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type = inode->i_mode >> 12;
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}
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dput(child);
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end_instantiate:
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if (!ino)
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ino= find_inode_number(dir, &qname);
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if (!ino)
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ino = 1;
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return filldir(dirent, qname.name, qname.len, filp->f_pos, ino, type);
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return !!filldir(dirent, qname.name, qname.len, filp->f_pos, ino, type);
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}
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static int scan(struct ctl_table_header *head, ctl_table *table,
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unsigned long *pos, struct file *file,
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void *dirent, filldir_t filldir)
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{
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for (; table->ctl_name || table->procname; table++, (*pos)++) {
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int res;
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/* Can't do anything without a proc name */
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if (!table->procname)
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continue;
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if (*pos < file->f_pos)
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continue;
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res = proc_sys_fill_cache(file, dirent, filldir, head, table);
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if (res)
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return res;
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file->f_pos = *pos + 1;
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}
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return 0;
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}
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static int proc_sys_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct dentry *dentry = filp->f_dentry;
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struct dentry *dentry = filp->f_path.dentry;
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struct inode *inode = dentry->d_inode;
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struct ctl_table_header *head = NULL;
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struct ctl_table *table;
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struct ctl_table_header *head = grab_header(inode);
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struct ctl_table *table = PROC_I(inode)->sysctl_entry;
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struct ctl_table_header *h = NULL;
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unsigned long pos;
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int ret;
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int ret = -EINVAL;
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|
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ret = -ENOTDIR;
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if (!S_ISDIR(inode->i_mode))
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if (IS_ERR(head))
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return PTR_ERR(head);
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|
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if (table && !table->child) {
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WARN_ON(1);
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goto out;
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}
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|
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table = table ? table->child : head->ctl_table;
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|
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ret = 0;
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/* Avoid a switch here: arm builds fail with missing __cmpdi2 */
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|
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@ -311,30 +273,17 @@ static int proc_sys_readdir(struct file *filp, void *dirent, filldir_t filldir)
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}
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pos = 2;
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|
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/* - Find each instance of the directory
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* - Read all entries in each instance
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* - Before returning an entry to user space lookup the entry
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* by name and if I find a different entry don't return
|
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* this one because it means it is a buried dup.
|
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* For sysctl this should only happen for directory entries.
|
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*/
|
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for (head = sysctl_head_next(NULL); head; head = sysctl_head_next(head)) {
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table = proc_sys_lookup_table(dentry, head->ctl_table);
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|
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if (!table)
|
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continue;
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|
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for (; table->ctl_name || table->procname; table++, pos++) {
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/* Can't do anything without a proc name */
|
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if (!table->procname)
|
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continue;
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|
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if (pos < filp->f_pos)
|
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continue;
|
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|
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if (proc_sys_fill_cache(filp, dirent, filldir, table) < 0)
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ret = scan(head, table, &pos, filp, dirent, filldir);
|
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if (ret)
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goto out;
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filp->f_pos = pos + 1;
|
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|
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for (h = sysctl_head_next(NULL); h; h = sysctl_head_next(h)) {
|
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if (h->attached_to != table)
|
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continue;
|
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ret = scan(h, h->attached_by, &pos, filp, dirent, filldir);
|
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if (ret) {
|
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sysctl_head_finish(h);
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break;
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}
|
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}
|
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ret = 1;
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|
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@ -349,47 +298,18 @@ static int proc_sys_permission(struct inode *inode, int mask, struct nameidata *
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* sysctl entries that are not writeable,
|
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* are _NOT_ writeable, capabilities or not.
|
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*/
|
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struct ctl_table_header *head;
|
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struct ctl_table *table;
|
||||
struct dentry *dentry;
|
||||
int mode;
|
||||
int depth;
|
||||
struct ctl_table_header *head = grab_header(inode);
|
||||
struct ctl_table *table = PROC_I(inode)->sysctl_entry;
|
||||
int error;
|
||||
|
||||
head = NULL;
|
||||
depth = PROC_I(inode)->fd;
|
||||
if (IS_ERR(head))
|
||||
return PTR_ERR(head);
|
||||
|
||||
/* First check the cached permissions, in case we don't have
|
||||
* enough information to lookup the sysctl table entry.
|
||||
*/
|
||||
error = -EACCES;
|
||||
mode = inode->i_mode;
|
||||
|
||||
if (current->euid == 0)
|
||||
mode >>= 6;
|
||||
else if (in_group_p(0))
|
||||
mode >>= 3;
|
||||
|
||||
if ((mode & mask & (MAY_READ|MAY_WRITE|MAY_EXEC)) == mask)
|
||||
error = 0;
|
||||
|
||||
/* If we can't get a sysctl table entry the permission
|
||||
* checks on the cached mode will have to be enough.
|
||||
*/
|
||||
if (!nd || !depth)
|
||||
goto out;
|
||||
|
||||
dentry = nd->path.dentry;
|
||||
table = do_proc_sys_lookup(dentry->d_parent, &dentry->d_name, &head);
|
||||
|
||||
/* If the entry does not exist deny permission */
|
||||
error = -EACCES;
|
||||
if (!table)
|
||||
goto out;
|
||||
|
||||
/* Use the permissions on the sysctl table entry */
|
||||
if (!table) /* global root - r-xr-xr-x */
|
||||
error = mask & MAY_WRITE ? -EACCES : 0;
|
||||
else /* Use the permissions on the sysctl table entry */
|
||||
error = sysctl_perm(head->root, table, mask);
|
||||
out:
|
||||
|
||||
sysctl_head_finish(head);
|
||||
return error;
|
||||
}
|
||||
|
|
@ -409,33 +329,70 @@ static int proc_sys_setattr(struct dentry *dentry, struct iattr *attr)
|
|||
return error;
|
||||
}
|
||||
|
||||
/* I'm lazy and don't distinguish between files and directories,
|
||||
* until access time.
|
||||
*/
|
||||
static int proc_sys_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
struct ctl_table_header *head = grab_header(inode);
|
||||
struct ctl_table *table = PROC_I(inode)->sysctl_entry;
|
||||
|
||||
if (IS_ERR(head))
|
||||
return PTR_ERR(head);
|
||||
|
||||
generic_fillattr(inode, stat);
|
||||
if (table)
|
||||
stat->mode = (stat->mode & S_IFMT) | table->mode;
|
||||
|
||||
sysctl_head_finish(head);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct file_operations proc_sys_file_operations = {
|
||||
.read = proc_sys_read,
|
||||
.write = proc_sys_write,
|
||||
};
|
||||
|
||||
static const struct file_operations proc_sys_dir_file_operations = {
|
||||
.readdir = proc_sys_readdir,
|
||||
};
|
||||
|
||||
static const struct inode_operations proc_sys_inode_operations = {
|
||||
.permission = proc_sys_permission,
|
||||
.setattr = proc_sys_setattr,
|
||||
.getattr = proc_sys_getattr,
|
||||
};
|
||||
|
||||
static const struct inode_operations proc_sys_dir_operations = {
|
||||
.lookup = proc_sys_lookup,
|
||||
.permission = proc_sys_permission,
|
||||
.setattr = proc_sys_setattr,
|
||||
.getattr = proc_sys_getattr,
|
||||
};
|
||||
|
||||
static int proc_sys_revalidate(struct dentry *dentry, struct nameidata *nd)
|
||||
{
|
||||
struct ctl_table_header *head;
|
||||
struct ctl_table *table;
|
||||
table = do_proc_sys_lookup(dentry->d_parent, &dentry->d_name, &head);
|
||||
proc_sys_refresh_inode(dentry->d_inode, table);
|
||||
sysctl_head_finish(head);
|
||||
return !!table;
|
||||
return !PROC_I(dentry->d_inode)->sysctl->unregistering;
|
||||
}
|
||||
|
||||
static int proc_sys_delete(struct dentry *dentry)
|
||||
{
|
||||
return !!PROC_I(dentry->d_inode)->sysctl->unregistering;
|
||||
}
|
||||
|
||||
static int proc_sys_compare(struct dentry *dir, struct qstr *qstr,
|
||||
struct qstr *name)
|
||||
{
|
||||
struct dentry *dentry = container_of(qstr, struct dentry, d_name);
|
||||
if (qstr->len != name->len)
|
||||
return 1;
|
||||
if (memcmp(qstr->name, name->name, name->len))
|
||||
return 1;
|
||||
return !sysctl_is_seen(PROC_I(dentry->d_inode)->sysctl);
|
||||
}
|
||||
|
||||
static struct dentry_operations proc_sys_dentry_operations = {
|
||||
.d_revalidate = proc_sys_revalidate,
|
||||
.d_delete = proc_sys_delete,
|
||||
.d_compare = proc_sys_compare,
|
||||
};
|
||||
|
||||
static struct proc_dir_entry *proc_sys_root;
|
||||
|
|
@ -443,8 +400,8 @@ static struct proc_dir_entry *proc_sys_root;
|
|||
int proc_sys_init(void)
|
||||
{
|
||||
proc_sys_root = proc_mkdir("sys", NULL);
|
||||
proc_sys_root->proc_iops = &proc_sys_inode_operations;
|
||||
proc_sys_root->proc_fops = &proc_sys_file_operations;
|
||||
proc_sys_root->proc_iops = &proc_sys_dir_operations;
|
||||
proc_sys_root->proc_fops = &proc_sys_dir_file_operations;
|
||||
proc_sys_root->nlink = 0;
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -282,11 +282,16 @@ union proc_op {
|
|||
struct task_struct *task);
|
||||
};
|
||||
|
||||
struct ctl_table_header;
|
||||
struct ctl_table;
|
||||
|
||||
struct proc_inode {
|
||||
struct pid *pid;
|
||||
int fd;
|
||||
union proc_op op;
|
||||
struct proc_dir_entry *pde;
|
||||
struct ctl_table_header *sysctl;
|
||||
struct ctl_table *sysctl_entry;
|
||||
struct inode vfs_inode;
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -961,6 +961,7 @@ struct ctl_table_header;
|
|||
|
||||
extern void sysctl_head_get(struct ctl_table_header *);
|
||||
extern void sysctl_head_put(struct ctl_table_header *);
|
||||
extern int sysctl_is_seen(struct ctl_table_header *);
|
||||
extern struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *);
|
||||
extern struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev);
|
||||
extern struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
|
||||
|
|
|
|||
|
|
@ -1932,6 +1932,21 @@ void unregister_sysctl_table(struct ctl_table_header * header)
|
|||
spin_unlock(&sysctl_lock);
|
||||
}
|
||||
|
||||
int sysctl_is_seen(struct ctl_table_header *p)
|
||||
{
|
||||
struct ctl_table_set *set = p->set;
|
||||
int res;
|
||||
spin_lock(&sysctl_lock);
|
||||
if (p->unregistering)
|
||||
res = 0;
|
||||
else if (!set->is_seen)
|
||||
res = 1;
|
||||
else
|
||||
res = set->is_seen(set);
|
||||
spin_unlock(&sysctl_lock);
|
||||
return res;
|
||||
}
|
||||
|
||||
void setup_sysctl_set(struct ctl_table_set *p,
|
||||
struct ctl_table_set *parent,
|
||||
int (*is_seen)(struct ctl_table_set *))
|
||||
|
|
|
|||
Loading…
Reference in a new issue