linux/fs/nilfs2/ioctl.c
Ryusuke Konishi 83aca8f480 nilfs2: check size of array structured data exchanged via ioctls
Although some ioctls of nilfs2 exchange data in the form of indirectly
referenced array, some of them lack size check on the array elements.

This inserts the missing checks and rejects requests if data of ioctl
does not have a valid format.

We usually don't have to check size of structures that we associated
with ioctl commands because the size is tested implicitly for
identifying ioctl command; the checks this patch adds are for the
cases where the implicit check is not applied.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-05-12 01:48:54 +09:00

666 lines
17 KiB
C

/*
* ioctl.c - NILFS ioctl operations.
*
* Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by Koji Sato <koji@osrg.net>.
*/
#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/smp_lock.h> /* lock_kernel(), unlock_kernel() */
#include <linux/capability.h> /* capable() */
#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
#include <linux/vmalloc.h>
#include <linux/nilfs2_fs.h>
#include "nilfs.h"
#include "segment.h"
#include "bmap.h"
#include "cpfile.h"
#include "sufile.h"
#include "dat.h"
static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
struct nilfs_argv *argv, int dir,
ssize_t (*dofunc)(struct the_nilfs *,
__u64 *, int,
void *, size_t, size_t))
{
void *buf;
void __user *base = (void __user *)(unsigned long)argv->v_base;
size_t maxmembs, total, n;
ssize_t nr;
int ret, i;
__u64 pos, ppos;
if (argv->v_nmembs == 0)
return 0;
if (argv->v_size > PAGE_SIZE)
return -EINVAL;
buf = (void *)__get_free_pages(GFP_NOFS, 0);
if (unlikely(!buf))
return -ENOMEM;
maxmembs = PAGE_SIZE / argv->v_size;
ret = 0;
total = 0;
pos = argv->v_index;
for (i = 0; i < argv->v_nmembs; i += n) {
n = (argv->v_nmembs - i < maxmembs) ?
argv->v_nmembs - i : maxmembs;
if ((dir & _IOC_WRITE) &&
copy_from_user(buf, base + argv->v_size * i,
argv->v_size * n)) {
ret = -EFAULT;
break;
}
ppos = pos;
nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
n);
if (nr < 0) {
ret = nr;
break;
}
if ((dir & _IOC_READ) &&
copy_to_user(base + argv->v_size * i, buf,
argv->v_size * nr)) {
ret = -EFAULT;
break;
}
total += nr;
if ((size_t)nr < n)
break;
if (pos == ppos)
pos += n;
}
argv->v_nmembs = total;
free_pages((unsigned long)buf, 0);
return ret;
}
static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
struct nilfs_transaction_info ti;
struct nilfs_cpmode cpmode;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
return -EFAULT;
nilfs_transaction_begin(inode->i_sb, &ti, 0);
ret = nilfs_cpfile_change_cpmode(
cpfile, cpmode.cm_cno, cpmode.cm_mode);
if (unlikely(ret < 0)) {
nilfs_transaction_abort(inode->i_sb);
return ret;
}
nilfs_transaction_commit(inode->i_sb); /* never fails */
return ret;
}
static int
nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
struct nilfs_transaction_info ti;
__u64 cno;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(&cno, argp, sizeof(cno)))
return -EFAULT;
nilfs_transaction_begin(inode->i_sb, &ti, 0);
ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
if (unlikely(ret < 0)) {
nilfs_transaction_abort(inode->i_sb);
return ret;
}
nilfs_transaction_commit(inode->i_sb); /* never fails */
return ret;
}
static ssize_t
nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
nmembs);
up_read(&nilfs->ns_segctor_sem);
return ret;
}
static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
struct nilfs_cpstat cpstat;
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
up_read(&nilfs->ns_segctor_sem);
if (ret < 0)
return ret;
if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
ret = -EFAULT;
return ret;
}
static ssize_t
nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
up_read(&nilfs->ns_segctor_sem);
return ret;
}
static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
struct nilfs_sustat sustat;
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
up_read(&nilfs->ns_segctor_sem);
if (ret < 0)
return ret;
if (copy_to_user(argp, &sustat, sizeof(sustat)))
ret = -EFAULT;
return ret;
}
static ssize_t
nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
up_read(&nilfs->ns_segctor_sem);
return ret;
}
static ssize_t
nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
struct inode *dat = nilfs_dat_inode(nilfs);
struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
struct nilfs_bdesc *bdescs = buf;
int ret, i;
down_read(&nilfs->ns_segctor_sem);
for (i = 0; i < nmembs; i++) {
ret = nilfs_bmap_lookup_at_level(bmap,
bdescs[i].bd_offset,
bdescs[i].bd_level + 1,
&bdescs[i].bd_blocknr);
if (ret < 0) {
if (ret != -ENOENT) {
up_read(&nilfs->ns_segctor_sem);
return ret;
}
bdescs[i].bd_blocknr = 0;
}
}
up_read(&nilfs->ns_segctor_sem);
return nmembs;
}
static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
struct nilfs_argv argv;
int ret;
if (copy_from_user(&argv, argp, sizeof(argv)))
return -EFAULT;
if (argv.v_size != sizeof(struct nilfs_bdesc))
return -EINVAL;
ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
nilfs_ioctl_do_get_bdescs);
if (ret < 0)
return ret;
if (copy_to_user(argp, &argv, sizeof(argv)))
ret = -EFAULT;
return ret;
}
static int nilfs_ioctl_move_inode_block(struct inode *inode,
struct nilfs_vdesc *vdesc,
struct list_head *buffers)
{
struct buffer_head *bh;
int ret;
if (vdesc->vd_flags == 0)
ret = nilfs_gccache_submit_read_data(
inode, vdesc->vd_offset, vdesc->vd_blocknr,
vdesc->vd_vblocknr, &bh);
else
ret = nilfs_gccache_submit_read_node(
inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
if (unlikely(ret < 0)) {
if (ret == -ENOENT)
printk(KERN_CRIT
"%s: invalid virtual block address (%s): "
"ino=%llu, cno=%llu, offset=%llu, "
"blocknr=%llu, vblocknr=%llu\n",
__func__, vdesc->vd_flags ? "node" : "data",
(unsigned long long)vdesc->vd_ino,
(unsigned long long)vdesc->vd_cno,
(unsigned long long)vdesc->vd_offset,
(unsigned long long)vdesc->vd_blocknr,
(unsigned long long)vdesc->vd_vblocknr);
return ret;
}
bh->b_private = vdesc;
list_add_tail(&bh->b_assoc_buffers, buffers);
return 0;
}
static int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
struct inode *inode;
struct nilfs_vdesc *vdesc;
struct buffer_head *bh, *n;
LIST_HEAD(buffers);
ino_t ino;
__u64 cno;
int i, ret;
for (i = 0, vdesc = buf; i < nmembs; ) {
ino = vdesc->vd_ino;
cno = vdesc->vd_cno;
inode = nilfs_gc_iget(nilfs, ino, cno);
if (unlikely(inode == NULL)) {
ret = -ENOMEM;
goto failed;
}
do {
ret = nilfs_ioctl_move_inode_block(inode, vdesc,
&buffers);
if (unlikely(ret < 0))
goto failed;
vdesc++;
} while (++i < nmembs &&
vdesc->vd_ino == ino && vdesc->vd_cno == cno);
}
list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
ret = nilfs_gccache_wait_and_mark_dirty(bh);
if (unlikely(ret < 0)) {
if (ret == -EEXIST) {
vdesc = bh->b_private;
printk(KERN_CRIT
"%s: conflicting %s buffer: "
"ino=%llu, cno=%llu, offset=%llu, "
"blocknr=%llu, vblocknr=%llu\n",
__func__,
vdesc->vd_flags ? "node" : "data",
(unsigned long long)vdesc->vd_ino,
(unsigned long long)vdesc->vd_cno,
(unsigned long long)vdesc->vd_offset,
(unsigned long long)vdesc->vd_blocknr,
(unsigned long long)vdesc->vd_vblocknr);
}
goto failed;
}
list_del_init(&bh->b_assoc_buffers);
bh->b_private = NULL;
brelse(bh);
}
return nmembs;
failed:
list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
list_del_init(&bh->b_assoc_buffers);
bh->b_private = NULL;
brelse(bh);
}
return ret;
}
static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
struct inode *cpfile = nilfs->ns_cpfile;
struct nilfs_period *periods = buf;
int ret, i;
for (i = 0; i < nmembs; i++) {
ret = nilfs_cpfile_delete_checkpoints(
cpfile, periods[i].p_start, periods[i].p_end);
if (ret < 0)
return ret;
}
return nmembs;
}
static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
int ret;
ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
return (ret < 0) ? ret : nmembs;
}
static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
struct inode *dat = nilfs_dat_inode(nilfs);
struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
struct nilfs_bdesc *bdescs = buf;
int ret, i;
for (i = 0; i < nmembs; i++) {
/* XXX: use macro or inline func to check liveness */
ret = nilfs_bmap_lookup_at_level(bmap,
bdescs[i].bd_offset,
bdescs[i].bd_level + 1,
&bdescs[i].bd_blocknr);
if (ret < 0) {
if (ret != -ENOENT)
return ret;
bdescs[i].bd_blocknr = 0;
}
if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
/* skip dead block */
continue;
if (bdescs[i].bd_level == 0) {
ret = nilfs_mdt_mark_block_dirty(dat,
bdescs[i].bd_offset);
if (ret < 0) {
WARN_ON(ret == -ENOENT);
return ret;
}
} else {
ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
bdescs[i].bd_level);
if (ret < 0) {
WARN_ON(ret == -ENOENT);
return ret;
}
}
}
return nmembs;
}
static int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
struct nilfs_sb_info *sbi = nilfs->ns_writer;
int ret;
if (unlikely(!sbi)) {
/* never happens because called for a writable mount */
WARN_ON(1);
return -EROFS;
}
ret = nilfs_segctor_add_segments_to_be_freed(
NILFS_SC(sbi), buf, nmembs);
return (ret < 0) ? ret : nmembs;
}
int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void **kbufs)
{
const char *msg;
int ret;
ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], kbufs[0]);
if (ret < 0) {
msg = "cannot read source blocks";
goto failed;
}
ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
if (ret < 0) {
/*
* can safely abort because checkpoints can be removed
* independently.
*/
msg = "cannot delete checkpoints";
goto failed;
}
ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], kbufs[2]);
if (ret < 0) {
/*
* can safely abort because DAT file is updated atomically
* using a copy-on-write technique.
*/
msg = "cannot delete virtual blocks from DAT file";
goto failed;
}
ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], kbufs[3]);
if (ret < 0) {
/*
* can safely abort because the operation is nondestructive.
*/
msg = "cannot mark copying blocks dirty";
goto failed;
}
ret = nilfs_ioctl_free_segments(nilfs, &argv[4], kbufs[4]);
if (ret < 0) {
/*
* can safely abort because this operation is atomic.
*/
msg = "cannot set segments to be freed";
goto failed;
}
return 0;
failed:
nilfs_remove_all_gcinode(nilfs);
printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
msg, ret);
return ret;
}
static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct nilfs_argv argv[5];
const static size_t argsz[5] = {
sizeof(struct nilfs_vdesc),
sizeof(struct nilfs_period),
sizeof(__u64),
sizeof(struct nilfs_bdesc),
sizeof(__u64),
};
void __user *base;
void *kbufs[5];
struct the_nilfs *nilfs;
size_t len, nsegs;
int n, ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (copy_from_user(argv, argp, sizeof(argv)))
return -EFAULT;
nsegs = argv[4].v_nmembs;
if (argv[4].v_size != argsz[4])
return -EINVAL;
/*
* argv[4] points to segment numbers this ioctl cleans. We
* use kmalloc() for its buffer because memory used for the
* segment numbers is enough small.
*/
kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
nsegs * sizeof(__u64));
if (IS_ERR(kbufs[4]))
return PTR_ERR(kbufs[4]);
nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
for (n = 0; n < 4; n++) {
ret = -EINVAL;
if (argv[n].v_size != argsz[n])
goto out_free;
if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
goto out_free;
len = argv[n].v_size * argv[n].v_nmembs;
base = (void __user *)(unsigned long)argv[n].v_base;
if (len == 0) {
kbufs[n] = NULL;
continue;
}
kbufs[n] = vmalloc(len);
if (!kbufs[n]) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(kbufs[n], base, len)) {
ret = -EFAULT;
vfree(kbufs[n]);
goto out_free;
}
}
ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
out_free:
while (--n > 0)
vfree(kbufs[n]);
kfree(kbufs[4]);
return ret;
}
static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
__u64 cno;
int ret;
ret = nilfs_construct_segment(inode->i_sb);
if (ret < 0)
return ret;
if (argp != NULL) {
cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
if (copy_to_user(argp, &cno, sizeof(cno)))
return -EFAULT;
}
return 0;
}
static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp,
size_t membsz,
ssize_t (*dofunc)(struct the_nilfs *,
__u64 *, int,
void *, size_t, size_t))
{
struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
struct nilfs_argv argv;
int ret;
if (copy_from_user(&argv, argp, sizeof(argv)))
return -EFAULT;
if (argv.v_size != membsz)
return -EINVAL;
ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
if (ret < 0)
return ret;
if (copy_to_user(argp, &argv, sizeof(argv)))
ret = -EFAULT;
return ret;
}
long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = filp->f_dentry->d_inode;
void __user *argp = (void * __user *)arg;
switch (cmd) {
case NILFS_IOCTL_CHANGE_CPMODE:
return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
case NILFS_IOCTL_DELETE_CHECKPOINT:
return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
case NILFS_IOCTL_GET_CPINFO:
return nilfs_ioctl_get_info(inode, filp, cmd, argp,
sizeof(struct nilfs_cpinfo),
nilfs_ioctl_do_get_cpinfo);
case NILFS_IOCTL_GET_CPSTAT:
return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
case NILFS_IOCTL_GET_SUINFO:
return nilfs_ioctl_get_info(inode, filp, cmd, argp,
sizeof(struct nilfs_suinfo),
nilfs_ioctl_do_get_suinfo);
case NILFS_IOCTL_GET_SUSTAT:
return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
case NILFS_IOCTL_GET_VINFO:
return nilfs_ioctl_get_info(inode, filp, cmd, argp,
sizeof(struct nilfs_vinfo),
nilfs_ioctl_do_get_vinfo);
case NILFS_IOCTL_GET_BDESCS:
return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
case NILFS_IOCTL_CLEAN_SEGMENTS:
return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
case NILFS_IOCTL_SYNC:
return nilfs_ioctl_sync(inode, filp, cmd, argp);
default:
return -ENOTTY;
}
}