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![Christoph Hellwig](/assets/img/avatar_default.png)
Add a flags argument to struct xattr_handler and pass it to all xattr handler methods. This allows using the same methods for multiple handlers, e.g. for the ACL methods which perform exactly the same action for the access and default ACLs, just using a different underlying attribute. With a little more groundwork it'll also allow sharing the methods for the regular user/trusted/secure handlers in extN, ocfs2 and jffs2 like it's already done for xfs in this patch. Also change the inode argument to the handlers to a dentry to allow using the handlers mechnism for filesystems that require it later, e.g. cifs. [with GFS2 bits updated by Steven Whitehouse <swhiteho@redhat.com>] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
691 lines
16 KiB
C
691 lines
16 KiB
C
/*
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File: fs/xattr.c
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Extended attribute handling.
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Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
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Copyright (C) 2001 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
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Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <linux/xattr.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/security.h>
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#include <linux/syscalls.h>
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#include <linux/module.h>
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#include <linux/fsnotify.h>
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#include <linux/audit.h>
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#include <asm/uaccess.h>
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/*
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* Check permissions for extended attribute access. This is a bit complicated
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* because different namespaces have very different rules.
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*/
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static int
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xattr_permission(struct inode *inode, const char *name, int mask)
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{
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/*
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* We can never set or remove an extended attribute on a read-only
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* filesystem or on an immutable / append-only inode.
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*/
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if (mask & MAY_WRITE) {
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if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
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return -EPERM;
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}
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/*
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* No restriction for security.* and system.* from the VFS. Decision
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* on these is left to the underlying filesystem / security module.
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*/
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if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) ||
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!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
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return 0;
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/*
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* The trusted.* namespace can only be accessed by a privileged user.
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*/
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if (!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
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return (capable(CAP_SYS_ADMIN) ? 0 : -EPERM);
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/* In user.* namespace, only regular files and directories can have
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* extended attributes. For sticky directories, only the owner and
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* privileged user can write attributes.
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*/
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if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) {
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if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
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return -EPERM;
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if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
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(mask & MAY_WRITE) && !is_owner_or_cap(inode))
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return -EPERM;
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}
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return inode_permission(inode, mask);
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}
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/**
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* __vfs_setxattr_noperm - perform setxattr operation without performing
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* permission checks.
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*
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* @dentry - object to perform setxattr on
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* @name - xattr name to set
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* @value - value to set @name to
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* @size - size of @value
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* @flags - flags to pass into filesystem operations
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*
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* returns the result of the internal setxattr or setsecurity operations.
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*
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* This function requires the caller to lock the inode's i_mutex before it
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* is executed. It also assumes that the caller will make the appropriate
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* permission checks.
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*/
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int __vfs_setxattr_noperm(struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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struct inode *inode = dentry->d_inode;
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int error = -EOPNOTSUPP;
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if (inode->i_op->setxattr) {
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error = inode->i_op->setxattr(dentry, name, value, size, flags);
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if (!error) {
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fsnotify_xattr(dentry);
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security_inode_post_setxattr(dentry, name, value,
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size, flags);
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}
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} else if (!strncmp(name, XATTR_SECURITY_PREFIX,
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XATTR_SECURITY_PREFIX_LEN)) {
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const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
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error = security_inode_setsecurity(inode, suffix, value,
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size, flags);
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if (!error)
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fsnotify_xattr(dentry);
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}
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return error;
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}
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int
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vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
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size_t size, int flags)
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{
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struct inode *inode = dentry->d_inode;
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int error;
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error = xattr_permission(inode, name, MAY_WRITE);
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if (error)
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return error;
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mutex_lock(&inode->i_mutex);
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error = security_inode_setxattr(dentry, name, value, size, flags);
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if (error)
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goto out;
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error = __vfs_setxattr_noperm(dentry, name, value, size, flags);
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out:
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mutex_unlock(&inode->i_mutex);
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return error;
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}
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EXPORT_SYMBOL_GPL(vfs_setxattr);
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ssize_t
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xattr_getsecurity(struct inode *inode, const char *name, void *value,
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size_t size)
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{
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void *buffer = NULL;
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ssize_t len;
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if (!value || !size) {
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len = security_inode_getsecurity(inode, name, &buffer, false);
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goto out_noalloc;
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}
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len = security_inode_getsecurity(inode, name, &buffer, true);
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if (len < 0)
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return len;
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if (size < len) {
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len = -ERANGE;
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goto out;
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}
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memcpy(value, buffer, len);
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out:
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security_release_secctx(buffer, len);
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out_noalloc:
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return len;
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}
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EXPORT_SYMBOL_GPL(xattr_getsecurity);
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ssize_t
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vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
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{
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struct inode *inode = dentry->d_inode;
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int error;
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error = xattr_permission(inode, name, MAY_READ);
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if (error)
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return error;
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error = security_inode_getxattr(dentry, name);
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if (error)
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return error;
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if (!strncmp(name, XATTR_SECURITY_PREFIX,
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XATTR_SECURITY_PREFIX_LEN)) {
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const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
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int ret = xattr_getsecurity(inode, suffix, value, size);
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/*
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* Only overwrite the return value if a security module
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* is actually active.
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*/
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if (ret == -EOPNOTSUPP)
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goto nolsm;
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return ret;
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}
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nolsm:
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if (inode->i_op->getxattr)
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error = inode->i_op->getxattr(dentry, name, value, size);
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else
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error = -EOPNOTSUPP;
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return error;
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}
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EXPORT_SYMBOL_GPL(vfs_getxattr);
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ssize_t
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vfs_listxattr(struct dentry *d, char *list, size_t size)
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{
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ssize_t error;
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error = security_inode_listxattr(d);
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if (error)
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return error;
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error = -EOPNOTSUPP;
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if (d->d_inode->i_op->listxattr) {
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error = d->d_inode->i_op->listxattr(d, list, size);
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} else {
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error = security_inode_listsecurity(d->d_inode, list, size);
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if (size && error > size)
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error = -ERANGE;
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}
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return error;
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}
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EXPORT_SYMBOL_GPL(vfs_listxattr);
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int
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vfs_removexattr(struct dentry *dentry, const char *name)
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{
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struct inode *inode = dentry->d_inode;
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int error;
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if (!inode->i_op->removexattr)
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return -EOPNOTSUPP;
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error = xattr_permission(inode, name, MAY_WRITE);
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if (error)
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return error;
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error = security_inode_removexattr(dentry, name);
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if (error)
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return error;
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mutex_lock(&inode->i_mutex);
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error = inode->i_op->removexattr(dentry, name);
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mutex_unlock(&inode->i_mutex);
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if (!error)
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fsnotify_xattr(dentry);
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return error;
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}
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EXPORT_SYMBOL_GPL(vfs_removexattr);
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/*
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* Extended attribute SET operations
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*/
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static long
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setxattr(struct dentry *d, const char __user *name, const void __user *value,
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size_t size, int flags)
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{
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int error;
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void *kvalue = NULL;
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char kname[XATTR_NAME_MAX + 1];
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if (flags & ~(XATTR_CREATE|XATTR_REPLACE))
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return -EINVAL;
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error = strncpy_from_user(kname, name, sizeof(kname));
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if (error == 0 || error == sizeof(kname))
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error = -ERANGE;
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if (error < 0)
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return error;
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if (size) {
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if (size > XATTR_SIZE_MAX)
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return -E2BIG;
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kvalue = memdup_user(value, size);
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if (IS_ERR(kvalue))
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return PTR_ERR(kvalue);
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}
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error = vfs_setxattr(d, kname, kvalue, size, flags);
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kfree(kvalue);
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return error;
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}
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SYSCALL_DEFINE5(setxattr, const char __user *, pathname,
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const char __user *, name, const void __user *, value,
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size_t, size, int, flags)
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{
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struct path path;
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int error;
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error = user_path(pathname, &path);
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if (error)
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return error;
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error = mnt_want_write(path.mnt);
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if (!error) {
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error = setxattr(path.dentry, name, value, size, flags);
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mnt_drop_write(path.mnt);
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}
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path_put(&path);
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return error;
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}
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SYSCALL_DEFINE5(lsetxattr, const char __user *, pathname,
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const char __user *, name, const void __user *, value,
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size_t, size, int, flags)
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{
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struct path path;
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int error;
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error = user_lpath(pathname, &path);
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if (error)
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return error;
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error = mnt_want_write(path.mnt);
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if (!error) {
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error = setxattr(path.dentry, name, value, size, flags);
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mnt_drop_write(path.mnt);
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}
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path_put(&path);
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return error;
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}
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SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
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const void __user *,value, size_t, size, int, flags)
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{
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struct file *f;
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struct dentry *dentry;
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int error = -EBADF;
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f = fget(fd);
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if (!f)
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return error;
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dentry = f->f_path.dentry;
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audit_inode(NULL, dentry);
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error = mnt_want_write_file(f);
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if (!error) {
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error = setxattr(dentry, name, value, size, flags);
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mnt_drop_write(f->f_path.mnt);
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}
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fput(f);
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return error;
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}
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/*
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* Extended attribute GET operations
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*/
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static ssize_t
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getxattr(struct dentry *d, const char __user *name, void __user *value,
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size_t size)
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{
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ssize_t error;
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void *kvalue = NULL;
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char kname[XATTR_NAME_MAX + 1];
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error = strncpy_from_user(kname, name, sizeof(kname));
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if (error == 0 || error == sizeof(kname))
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error = -ERANGE;
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if (error < 0)
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return error;
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if (size) {
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if (size > XATTR_SIZE_MAX)
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size = XATTR_SIZE_MAX;
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kvalue = kzalloc(size, GFP_KERNEL);
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if (!kvalue)
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return -ENOMEM;
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}
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error = vfs_getxattr(d, kname, kvalue, size);
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if (error > 0) {
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if (size && copy_to_user(value, kvalue, error))
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error = -EFAULT;
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} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {
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/* The file system tried to returned a value bigger
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than XATTR_SIZE_MAX bytes. Not possible. */
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error = -E2BIG;
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}
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kfree(kvalue);
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return error;
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}
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SYSCALL_DEFINE4(getxattr, const char __user *, pathname,
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const char __user *, name, void __user *, value, size_t, size)
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{
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struct path path;
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ssize_t error;
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error = user_path(pathname, &path);
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if (error)
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return error;
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error = getxattr(path.dentry, name, value, size);
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path_put(&path);
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return error;
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}
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SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname,
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const char __user *, name, void __user *, value, size_t, size)
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{
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struct path path;
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ssize_t error;
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error = user_lpath(pathname, &path);
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if (error)
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return error;
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error = getxattr(path.dentry, name, value, size);
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path_put(&path);
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return error;
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}
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SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
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void __user *, value, size_t, size)
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{
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struct file *f;
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ssize_t error = -EBADF;
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f = fget(fd);
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if (!f)
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return error;
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audit_inode(NULL, f->f_path.dentry);
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error = getxattr(f->f_path.dentry, name, value, size);
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fput(f);
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return error;
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}
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/*
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* Extended attribute LIST operations
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*/
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static ssize_t
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listxattr(struct dentry *d, char __user *list, size_t size)
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{
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ssize_t error;
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char *klist = NULL;
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if (size) {
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if (size > XATTR_LIST_MAX)
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size = XATTR_LIST_MAX;
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klist = kmalloc(size, GFP_KERNEL);
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if (!klist)
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return -ENOMEM;
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}
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error = vfs_listxattr(d, klist, size);
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if (error > 0) {
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if (size && copy_to_user(list, klist, error))
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error = -EFAULT;
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} else if (error == -ERANGE && size >= XATTR_LIST_MAX) {
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/* The file system tried to returned a list bigger
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than XATTR_LIST_MAX bytes. Not possible. */
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error = -E2BIG;
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}
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kfree(klist);
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return error;
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}
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SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list,
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size_t, size)
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{
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struct path path;
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ssize_t error;
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error = user_path(pathname, &path);
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if (error)
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return error;
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error = listxattr(path.dentry, list, size);
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path_put(&path);
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return error;
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}
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SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list,
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size_t, size)
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{
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struct path path;
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ssize_t error;
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error = user_lpath(pathname, &path);
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if (error)
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return error;
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error = listxattr(path.dentry, list, size);
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path_put(&path);
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return error;
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}
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SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
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{
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struct file *f;
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ssize_t error = -EBADF;
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f = fget(fd);
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if (!f)
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return error;
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audit_inode(NULL, f->f_path.dentry);
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error = listxattr(f->f_path.dentry, list, size);
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fput(f);
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return error;
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}
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/*
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* Extended attribute REMOVE operations
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*/
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static long
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removexattr(struct dentry *d, const char __user *name)
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{
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int error;
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char kname[XATTR_NAME_MAX + 1];
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error = strncpy_from_user(kname, name, sizeof(kname));
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if (error == 0 || error == sizeof(kname))
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error = -ERANGE;
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if (error < 0)
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return error;
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return vfs_removexattr(d, kname);
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}
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SYSCALL_DEFINE2(removexattr, const char __user *, pathname,
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const char __user *, name)
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{
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struct path path;
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int error;
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error = user_path(pathname, &path);
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if (error)
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return error;
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error = mnt_want_write(path.mnt);
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if (!error) {
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error = removexattr(path.dentry, name);
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mnt_drop_write(path.mnt);
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}
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path_put(&path);
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return error;
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}
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SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname,
|
|
const char __user *, name)
|
|
{
|
|
struct path path;
|
|
int error;
|
|
|
|
error = user_lpath(pathname, &path);
|
|
if (error)
|
|
return error;
|
|
error = mnt_want_write(path.mnt);
|
|
if (!error) {
|
|
error = removexattr(path.dentry, name);
|
|
mnt_drop_write(path.mnt);
|
|
}
|
|
path_put(&path);
|
|
return error;
|
|
}
|
|
|
|
SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
|
|
{
|
|
struct file *f;
|
|
struct dentry *dentry;
|
|
int error = -EBADF;
|
|
|
|
f = fget(fd);
|
|
if (!f)
|
|
return error;
|
|
dentry = f->f_path.dentry;
|
|
audit_inode(NULL, dentry);
|
|
error = mnt_want_write_file(f);
|
|
if (!error) {
|
|
error = removexattr(dentry, name);
|
|
mnt_drop_write(f->f_path.mnt);
|
|
}
|
|
fput(f);
|
|
return error;
|
|
}
|
|
|
|
|
|
static const char *
|
|
strcmp_prefix(const char *a, const char *a_prefix)
|
|
{
|
|
while (*a_prefix && *a == *a_prefix) {
|
|
a++;
|
|
a_prefix++;
|
|
}
|
|
return *a_prefix ? NULL : a;
|
|
}
|
|
|
|
/*
|
|
* In order to implement different sets of xattr operations for each xattr
|
|
* prefix with the generic xattr API, a filesystem should create a
|
|
* null-terminated array of struct xattr_handler (one for each prefix) and
|
|
* hang a pointer to it off of the s_xattr field of the superblock.
|
|
*
|
|
* The generic_fooxattr() functions will use this list to dispatch xattr
|
|
* operations to the correct xattr_handler.
|
|
*/
|
|
#define for_each_xattr_handler(handlers, handler) \
|
|
for ((handler) = *(handlers)++; \
|
|
(handler) != NULL; \
|
|
(handler) = *(handlers)++)
|
|
|
|
/*
|
|
* Find the xattr_handler with the matching prefix.
|
|
*/
|
|
static struct xattr_handler *
|
|
xattr_resolve_name(struct xattr_handler **handlers, const char **name)
|
|
{
|
|
struct xattr_handler *handler;
|
|
|
|
if (!*name)
|
|
return NULL;
|
|
|
|
for_each_xattr_handler(handlers, handler) {
|
|
const char *n = strcmp_prefix(*name, handler->prefix);
|
|
if (n) {
|
|
*name = n;
|
|
break;
|
|
}
|
|
}
|
|
return handler;
|
|
}
|
|
|
|
/*
|
|
* Find the handler for the prefix and dispatch its get() operation.
|
|
*/
|
|
ssize_t
|
|
generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size)
|
|
{
|
|
struct xattr_handler *handler;
|
|
|
|
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
|
|
if (!handler)
|
|
return -EOPNOTSUPP;
|
|
return handler->get(dentry, name, buffer, size, handler->flags);
|
|
}
|
|
|
|
/*
|
|
* Combine the results of the list() operation from every xattr_handler in the
|
|
* list.
|
|
*/
|
|
ssize_t
|
|
generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
|
|
{
|
|
struct xattr_handler *handler, **handlers = dentry->d_sb->s_xattr;
|
|
unsigned int size = 0;
|
|
|
|
if (!buffer) {
|
|
for_each_xattr_handler(handlers, handler) {
|
|
size += handler->list(dentry, NULL, 0, NULL, 0,
|
|
handler->flags);
|
|
}
|
|
} else {
|
|
char *buf = buffer;
|
|
|
|
for_each_xattr_handler(handlers, handler) {
|
|
size = handler->list(dentry, buf, buffer_size,
|
|
NULL, 0, handler->flags);
|
|
if (size > buffer_size)
|
|
return -ERANGE;
|
|
buf += size;
|
|
buffer_size -= size;
|
|
}
|
|
size = buf - buffer;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* Find the handler for the prefix and dispatch its set() operation.
|
|
*/
|
|
int
|
|
generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags)
|
|
{
|
|
struct xattr_handler *handler;
|
|
|
|
if (size == 0)
|
|
value = ""; /* empty EA, do not remove */
|
|
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
|
|
if (!handler)
|
|
return -EOPNOTSUPP;
|
|
return handler->set(dentry, name, value, size, 0, handler->flags);
|
|
}
|
|
|
|
/*
|
|
* Find the handler for the prefix and dispatch its set() operation to remove
|
|
* any associated extended attribute.
|
|
*/
|
|
int
|
|
generic_removexattr(struct dentry *dentry, const char *name)
|
|
{
|
|
struct xattr_handler *handler;
|
|
|
|
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
|
|
if (!handler)
|
|
return -EOPNOTSUPP;
|
|
return handler->set(dentry, name, NULL, 0,
|
|
XATTR_REPLACE, handler->flags);
|
|
}
|
|
|
|
EXPORT_SYMBOL(generic_getxattr);
|
|
EXPORT_SYMBOL(generic_listxattr);
|
|
EXPORT_SYMBOL(generic_setxattr);
|
|
EXPORT_SYMBOL(generic_removexattr);
|