2006-01-16 19:50:04 +03:00
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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2006-05-18 23:09:15 +04:00
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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2006-01-16 19:50:04 +03:00
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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2006-09-01 19:05:15 +04:00
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* of the GNU General Public License version 2.
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2006-01-16 19:50:04 +03:00
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*/
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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2007-07-17 15:04:28 +04:00
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#include <linux/exportfs.h>
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2006-02-28 01:23:27 +03:00
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#include <linux/gfs2_ondisk.h>
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2006-03-28 23:14:04 +04:00
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#include <linux/crc32.h>
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2006-01-16 19:50:04 +03:00
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#include "gfs2.h"
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2006-02-28 01:23:27 +03:00
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#include "incore.h"
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2006-01-16 19:50:04 +03:00
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#include "dir.h"
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#include "glock.h"
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#include "glops.h"
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#include "inode.h"
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2008-10-14 19:05:55 +04:00
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#include "super.h"
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2006-01-16 19:50:04 +03:00
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#include "rgrp.h"
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2006-03-20 20:30:04 +03:00
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#include "util.h"
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2006-01-16 19:50:04 +03:00
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2007-06-01 17:11:58 +04:00
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#define GFS2_SMALL_FH_SIZE 4
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2007-06-28 01:07:53 +04:00
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#define GFS2_LARGE_FH_SIZE 8
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2007-07-10 15:28:27 +04:00
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#define GFS2_OLD_FH_SIZE 10
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2007-06-01 17:11:58 +04:00
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2012-04-02 22:34:06 +04:00
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static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len,
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struct inode *parent)
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2006-01-16 19:50:04 +03:00
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{
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2006-10-14 18:46:30 +04:00
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__be32 *fh = (__force __be32 *)p;
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2006-03-01 23:31:02 +03:00
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struct super_block *sb = inode->i_sb;
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2006-06-14 23:32:57 +04:00
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struct gfs2_inode *ip = GFS2_I(inode);
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2006-01-16 19:50:04 +03:00
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2012-04-02 22:34:06 +04:00
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if (parent && (*len < GFS2_LARGE_FH_SIZE)) {
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2011-01-29 16:13:25 +03:00
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*len = GFS2_LARGE_FH_SIZE;
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2013-02-17 10:48:11 +04:00
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return FILEID_INVALID;
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2011-01-29 16:13:25 +03:00
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} else if (*len < GFS2_SMALL_FH_SIZE) {
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*len = GFS2_SMALL_FH_SIZE;
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2013-02-17 10:48:11 +04:00
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return FILEID_INVALID;
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2011-01-29 16:13:25 +03:00
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}
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2006-01-16 19:50:04 +03:00
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2007-05-15 18:37:50 +04:00
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fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
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fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
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fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
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fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
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2006-09-05 00:16:45 +04:00
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*len = GFS2_SMALL_FH_SIZE;
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2006-01-16 19:50:04 +03:00
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2015-03-18 01:25:59 +03:00
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if (!parent || inode == d_inode(sb->s_root))
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2006-01-16 19:50:04 +03:00
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return *len;
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2012-04-02 22:34:06 +04:00
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ip = GFS2_I(parent);
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2006-01-16 19:50:04 +03:00
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2007-05-15 18:37:50 +04:00
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fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
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fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
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fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
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fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
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2006-09-05 00:16:45 +04:00
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*len = GFS2_LARGE_FH_SIZE;
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2006-01-16 19:50:04 +03:00
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return *len;
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}
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struct get_name_filldir {
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2013-05-16 22:14:48 +04:00
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struct dir_context ctx;
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2006-10-14 06:51:24 +04:00
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struct gfs2_inum_host inum;
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2006-01-16 19:50:04 +03:00
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char *name;
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};
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2014-10-30 19:37:34 +03:00
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static int get_name_filldir(struct dir_context *ctx, const char *name,
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int length, loff_t offset, u64 inum,
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unsigned int type)
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2006-01-16 19:50:04 +03:00
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{
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2014-10-30 19:37:34 +03:00
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struct get_name_filldir *gnfd =
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container_of(ctx, struct get_name_filldir, ctx);
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2006-01-16 19:50:04 +03:00
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2007-01-17 18:09:20 +03:00
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if (inum != gnfd->inum.no_addr)
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2006-01-16 19:50:04 +03:00
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return 0;
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memcpy(gnfd->name, name, length);
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gnfd->name[length] = 0;
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return 1;
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}
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static int gfs2_get_name(struct dentry *parent, char *name,
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struct dentry *child)
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{
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2015-03-18 01:25:59 +03:00
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struct inode *dir = d_inode(parent);
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struct inode *inode = d_inode(child);
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2006-01-16 19:50:04 +03:00
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struct gfs2_inode *dip, *ip;
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2013-05-23 06:22:04 +04:00
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struct get_name_filldir gnfd = {
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.ctx.actor = get_name_filldir,
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.name = name
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};
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2006-01-16 19:50:04 +03:00
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struct gfs2_holder gh;
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int error;
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2011-10-27 20:16:06 +04:00
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struct file_ra_state f_ra = { .start = 0 };
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2006-01-16 19:50:04 +03:00
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if (!dir)
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return -EINVAL;
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if (!S_ISDIR(dir->i_mode) || !inode)
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return -EINVAL;
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2006-06-14 23:32:57 +04:00
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dip = GFS2_I(dir);
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ip = GFS2_I(inode);
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2006-01-16 19:50:04 +03:00
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*name = 0;
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2007-05-15 18:37:50 +04:00
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gnfd.inum.no_addr = ip->i_no_addr;
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gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
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2006-01-16 19:50:04 +03:00
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error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
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if (error)
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return error;
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2013-05-16 22:14:48 +04:00
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error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra);
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2006-01-16 19:50:04 +03:00
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gfs2_glock_dq_uninit(&gh);
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if (!error && !*name)
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error = -ENOENT;
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return error;
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}
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static struct dentry *gfs2_get_parent(struct dentry *child)
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{
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2015-03-18 01:25:59 +03:00
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return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1));
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2006-01-16 19:50:04 +03:00
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}
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2007-10-22 03:42:14 +04:00
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static struct dentry *gfs2_get_dentry(struct super_block *sb,
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2009-09-08 21:00:30 +04:00
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struct gfs2_inum_host *inum)
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2006-01-16 19:50:04 +03:00
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{
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2006-02-28 01:23:27 +03:00
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struct gfs2_sbd *sdp = sb->s_fs_info;
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2006-01-16 19:50:04 +03:00
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struct inode *inode;
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2010-11-03 23:01:07 +03:00
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inode = gfs2_lookup_by_inum(sdp, inum->no_addr, &inum->no_formal_ino,
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GFS2_BLKST_DINODE);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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2010-12-18 20:06:56 +03:00
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return d_obtain_alias(inode);
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2006-01-16 19:50:04 +03:00
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}
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2007-10-22 03:42:14 +04:00
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static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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struct gfs2_inum_host this;
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__be32 *fh = (__force __be32 *)fid->raw;
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switch (fh_type) {
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case GFS2_SMALL_FH_SIZE:
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case GFS2_LARGE_FH_SIZE:
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case GFS2_OLD_FH_SIZE:
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tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking
Fuzzing with trinity oopsed on the 1st instruction of shmem_fh_to_dentry(),
u64 inum = fid->raw[2];
which is unhelpfully reported as at the end of shmem_alloc_inode():
BUG: unable to handle kernel paging request at ffff880061cd3000
IP: [<ffffffff812190d0>] shmem_alloc_inode+0x40/0x40
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Call Trace:
[<ffffffff81488649>] ? exportfs_decode_fh+0x79/0x2d0
[<ffffffff812d77c3>] do_handle_open+0x163/0x2c0
[<ffffffff812d792c>] sys_open_by_handle_at+0xc/0x10
[<ffffffff83a5f3f8>] tracesys+0xe1/0xe6
Right, tmpfs is being stupid to access fid->raw[2] before validating that
fh_len includes it: the buffer kmalloc'ed by do_sys_name_to_handle() may
fall at the end of a page, and the next page not be present.
But some other filesystems (ceph, gfs2, isofs, reiserfs, xfs) are being
careless about fh_len too, in fh_to_dentry() and/or fh_to_parent(), and
could oops in the same way: add the missing fh_len checks to those.
Reported-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Sage Weil <sage@inktank.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-08 07:32:51 +04:00
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if (fh_len < GFS2_SMALL_FH_SIZE)
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return NULL;
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2007-10-22 03:42:14 +04:00
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this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
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this.no_formal_ino |= be32_to_cpu(fh[1]);
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this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
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this.no_addr |= be32_to_cpu(fh[3]);
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return gfs2_get_dentry(sb, &this);
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default:
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return NULL;
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}
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}
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static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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struct gfs2_inum_host parent;
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__be32 *fh = (__force __be32 *)fid->raw;
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switch (fh_type) {
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case GFS2_LARGE_FH_SIZE:
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case GFS2_OLD_FH_SIZE:
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tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking
Fuzzing with trinity oopsed on the 1st instruction of shmem_fh_to_dentry(),
u64 inum = fid->raw[2];
which is unhelpfully reported as at the end of shmem_alloc_inode():
BUG: unable to handle kernel paging request at ffff880061cd3000
IP: [<ffffffff812190d0>] shmem_alloc_inode+0x40/0x40
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Call Trace:
[<ffffffff81488649>] ? exportfs_decode_fh+0x79/0x2d0
[<ffffffff812d77c3>] do_handle_open+0x163/0x2c0
[<ffffffff812d792c>] sys_open_by_handle_at+0xc/0x10
[<ffffffff83a5f3f8>] tracesys+0xe1/0xe6
Right, tmpfs is being stupid to access fid->raw[2] before validating that
fh_len includes it: the buffer kmalloc'ed by do_sys_name_to_handle() may
fall at the end of a page, and the next page not be present.
But some other filesystems (ceph, gfs2, isofs, reiserfs, xfs) are being
careless about fh_len too, in fh_to_dentry() and/or fh_to_parent(), and
could oops in the same way: add the missing fh_len checks to those.
Reported-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Sage Weil <sage@inktank.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-10-08 07:32:51 +04:00
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if (fh_len < GFS2_LARGE_FH_SIZE)
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return NULL;
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2007-10-22 03:42:14 +04:00
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parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
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parent.no_formal_ino |= be32_to_cpu(fh[5]);
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parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
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parent.no_addr |= be32_to_cpu(fh[7]);
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return gfs2_get_dentry(sb, &parent);
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default:
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return NULL;
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}
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}
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2007-10-22 03:42:17 +04:00
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const struct export_operations gfs2_export_ops = {
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2006-01-16 19:50:04 +03:00
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.encode_fh = gfs2_encode_fh,
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2007-10-22 03:42:14 +04:00
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.fh_to_dentry = gfs2_fh_to_dentry,
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.fh_to_parent = gfs2_fh_to_parent,
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2006-01-16 19:50:04 +03:00
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.get_name = gfs2_get_name,
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.get_parent = gfs2_get_parent,
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};
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