![Will Newton](/assets/img/avatar_default.png)
I'm seeing an oops in mtd_dataflash.c with Linux 3.3. What appears to be happening is that otp_select_filemode calls mtd_read_fact_prot_reg with -1 for offset and length and a NULL buffer to test if OTP operations are supported. This finds its way down to otp_read in mtd_dataflash.c and causes an oops when memcpying the returned data into the NULL buf. None of the checks in otp_read catches the negative length and offset. Changing the length of the dummy read to 0 prevents the oops. Cc: stable@kernel.org [3.3+] Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
1241 lines
27 KiB
C
1241 lines
27 KiB
C
/*
|
|
* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
|
|
*
|
|
* 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
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/backing-dev.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/blkpg.h>
|
|
#include <linux/magic.h>
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/mtd/map.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
static DEFINE_MUTEX(mtd_mutex);
|
|
|
|
/*
|
|
* Data structure to hold the pointer to the mtd device as well
|
|
* as mode information of various use cases.
|
|
*/
|
|
struct mtd_file_info {
|
|
struct mtd_info *mtd;
|
|
struct inode *ino;
|
|
enum mtd_file_modes mode;
|
|
};
|
|
|
|
static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
|
|
switch (orig) {
|
|
case SEEK_SET:
|
|
break;
|
|
case SEEK_CUR:
|
|
offset += file->f_pos;
|
|
break;
|
|
case SEEK_END:
|
|
offset += mtd->size;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (offset >= 0 && offset <= mtd->size)
|
|
return file->f_pos = offset;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int count;
|
|
static struct vfsmount *mnt;
|
|
static struct file_system_type mtd_inodefs_type;
|
|
|
|
static int mtdchar_open(struct inode *inode, struct file *file)
|
|
{
|
|
int minor = iminor(inode);
|
|
int devnum = minor >> 1;
|
|
int ret = 0;
|
|
struct mtd_info *mtd;
|
|
struct mtd_file_info *mfi;
|
|
struct inode *mtd_ino;
|
|
|
|
pr_debug("MTD_open\n");
|
|
|
|
/* You can't open the RO devices RW */
|
|
if ((file->f_mode & FMODE_WRITE) && (minor & 1))
|
|
return -EACCES;
|
|
|
|
ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&mtd_mutex);
|
|
mtd = get_mtd_device(NULL, devnum);
|
|
|
|
if (IS_ERR(mtd)) {
|
|
ret = PTR_ERR(mtd);
|
|
goto out;
|
|
}
|
|
|
|
if (mtd->type == MTD_ABSENT) {
|
|
ret = -ENODEV;
|
|
goto out1;
|
|
}
|
|
|
|
mtd_ino = iget_locked(mnt->mnt_sb, devnum);
|
|
if (!mtd_ino) {
|
|
ret = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
if (mtd_ino->i_state & I_NEW) {
|
|
mtd_ino->i_private = mtd;
|
|
mtd_ino->i_mode = S_IFCHR;
|
|
mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
|
|
unlock_new_inode(mtd_ino);
|
|
}
|
|
file->f_mapping = mtd_ino->i_mapping;
|
|
|
|
/* You can't open it RW if it's not a writeable device */
|
|
if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
|
|
ret = -EACCES;
|
|
goto out2;
|
|
}
|
|
|
|
mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
|
|
if (!mfi) {
|
|
ret = -ENOMEM;
|
|
goto out2;
|
|
}
|
|
mfi->ino = mtd_ino;
|
|
mfi->mtd = mtd;
|
|
file->private_data = mfi;
|
|
mutex_unlock(&mtd_mutex);
|
|
return 0;
|
|
|
|
out2:
|
|
iput(mtd_ino);
|
|
out1:
|
|
put_mtd_device(mtd);
|
|
out:
|
|
mutex_unlock(&mtd_mutex);
|
|
simple_release_fs(&mnt, &count);
|
|
return ret;
|
|
} /* mtdchar_open */
|
|
|
|
/*====================================================================*/
|
|
|
|
static int mtdchar_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
|
|
pr_debug("MTD_close\n");
|
|
|
|
/* Only sync if opened RW */
|
|
if ((file->f_mode & FMODE_WRITE))
|
|
mtd_sync(mtd);
|
|
|
|
iput(mfi->ino);
|
|
|
|
put_mtd_device(mtd);
|
|
file->private_data = NULL;
|
|
kfree(mfi);
|
|
simple_release_fs(&mnt, &count);
|
|
|
|
return 0;
|
|
} /* mtdchar_close */
|
|
|
|
/* Back in June 2001, dwmw2 wrote:
|
|
*
|
|
* FIXME: This _really_ needs to die. In 2.5, we should lock the
|
|
* userspace buffer down and use it directly with readv/writev.
|
|
*
|
|
* The implementation below, using mtd_kmalloc_up_to, mitigates
|
|
* allocation failures when the system is under low-memory situations
|
|
* or if memory is highly fragmented at the cost of reducing the
|
|
* performance of the requested transfer due to a smaller buffer size.
|
|
*
|
|
* A more complex but more memory-efficient implementation based on
|
|
* get_user_pages and iovecs to cover extents of those pages is a
|
|
* longer-term goal, as intimated by dwmw2 above. However, for the
|
|
* write case, this requires yet more complex head and tail transfer
|
|
* handling when those head and tail offsets and sizes are such that
|
|
* alignment requirements are not met in the NAND subdriver.
|
|
*/
|
|
|
|
static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
size_t retlen;
|
|
size_t total_retlen=0;
|
|
int ret=0;
|
|
int len;
|
|
size_t size = count;
|
|
char *kbuf;
|
|
|
|
pr_debug("MTD_read\n");
|
|
|
|
if (*ppos + count > mtd->size)
|
|
count = mtd->size - *ppos;
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
kbuf = mtd_kmalloc_up_to(mtd, &size);
|
|
if (!kbuf)
|
|
return -ENOMEM;
|
|
|
|
while (count) {
|
|
len = min_t(size_t, count, size);
|
|
|
|
switch (mfi->mode) {
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
|
ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
|
|
&retlen, kbuf);
|
|
break;
|
|
case MTD_FILE_MODE_OTP_USER:
|
|
ret = mtd_read_user_prot_reg(mtd, *ppos, len,
|
|
&retlen, kbuf);
|
|
break;
|
|
case MTD_FILE_MODE_RAW:
|
|
{
|
|
struct mtd_oob_ops ops;
|
|
|
|
ops.mode = MTD_OPS_RAW;
|
|
ops.datbuf = kbuf;
|
|
ops.oobbuf = NULL;
|
|
ops.len = len;
|
|
|
|
ret = mtd_read_oob(mtd, *ppos, &ops);
|
|
retlen = ops.retlen;
|
|
break;
|
|
}
|
|
default:
|
|
ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
|
|
}
|
|
/* Nand returns -EBADMSG on ECC errors, but it returns
|
|
* the data. For our userspace tools it is important
|
|
* to dump areas with ECC errors!
|
|
* For kernel internal usage it also might return -EUCLEAN
|
|
* to signal the caller that a bitflip has occurred and has
|
|
* been corrected by the ECC algorithm.
|
|
* Userspace software which accesses NAND this way
|
|
* must be aware of the fact that it deals with NAND
|
|
*/
|
|
if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
|
|
*ppos += retlen;
|
|
if (copy_to_user(buf, kbuf, retlen)) {
|
|
kfree(kbuf);
|
|
return -EFAULT;
|
|
}
|
|
else
|
|
total_retlen += retlen;
|
|
|
|
count -= retlen;
|
|
buf += retlen;
|
|
if (retlen == 0)
|
|
count = 0;
|
|
}
|
|
else {
|
|
kfree(kbuf);
|
|
return ret;
|
|
}
|
|
|
|
}
|
|
|
|
kfree(kbuf);
|
|
return total_retlen;
|
|
} /* mtdchar_read */
|
|
|
|
static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
size_t size = count;
|
|
char *kbuf;
|
|
size_t retlen;
|
|
size_t total_retlen=0;
|
|
int ret=0;
|
|
int len;
|
|
|
|
pr_debug("MTD_write\n");
|
|
|
|
if (*ppos == mtd->size)
|
|
return -ENOSPC;
|
|
|
|
if (*ppos + count > mtd->size)
|
|
count = mtd->size - *ppos;
|
|
|
|
if (!count)
|
|
return 0;
|
|
|
|
kbuf = mtd_kmalloc_up_to(mtd, &size);
|
|
if (!kbuf)
|
|
return -ENOMEM;
|
|
|
|
while (count) {
|
|
len = min_t(size_t, count, size);
|
|
|
|
if (copy_from_user(kbuf, buf, len)) {
|
|
kfree(kbuf);
|
|
return -EFAULT;
|
|
}
|
|
|
|
switch (mfi->mode) {
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
|
ret = -EROFS;
|
|
break;
|
|
case MTD_FILE_MODE_OTP_USER:
|
|
ret = mtd_write_user_prot_reg(mtd, *ppos, len,
|
|
&retlen, kbuf);
|
|
break;
|
|
|
|
case MTD_FILE_MODE_RAW:
|
|
{
|
|
struct mtd_oob_ops ops;
|
|
|
|
ops.mode = MTD_OPS_RAW;
|
|
ops.datbuf = kbuf;
|
|
ops.oobbuf = NULL;
|
|
ops.ooboffs = 0;
|
|
ops.len = len;
|
|
|
|
ret = mtd_write_oob(mtd, *ppos, &ops);
|
|
retlen = ops.retlen;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
|
|
}
|
|
if (!ret) {
|
|
*ppos += retlen;
|
|
total_retlen += retlen;
|
|
count -= retlen;
|
|
buf += retlen;
|
|
}
|
|
else {
|
|
kfree(kbuf);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
kfree(kbuf);
|
|
return total_retlen;
|
|
} /* mtdchar_write */
|
|
|
|
/*======================================================================
|
|
|
|
IOCTL calls for getting device parameters.
|
|
|
|
======================================================================*/
|
|
static void mtdchar_erase_callback (struct erase_info *instr)
|
|
{
|
|
wake_up((wait_queue_head_t *)instr->priv);
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_MTD_OTP
|
|
static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
|
|
{
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
size_t retlen;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Make a fake call to mtd_read_fact_prot_reg() to check if OTP
|
|
* operations are supported.
|
|
*/
|
|
if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == -EOPNOTSUPP)
|
|
return -EOPNOTSUPP;
|
|
|
|
switch (mode) {
|
|
case MTD_OTP_FACTORY:
|
|
mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
|
|
break;
|
|
case MTD_OTP_USER:
|
|
mfi->mode = MTD_FILE_MODE_OTP_USER;
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
case MTD_OTP_OFF:
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
#else
|
|
# define otp_select_filemode(f,m) -EOPNOTSUPP
|
|
#endif
|
|
|
|
static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
|
|
uint64_t start, uint32_t length, void __user *ptr,
|
|
uint32_t __user *retp)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_oob_ops ops;
|
|
uint32_t retlen;
|
|
int ret = 0;
|
|
|
|
if (!(file->f_mode & FMODE_WRITE))
|
|
return -EPERM;
|
|
|
|
if (length > 4096)
|
|
return -EINVAL;
|
|
|
|
if (!mtd->_write_oob)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
ops.ooblen = length;
|
|
ops.ooboffs = start & (mtd->writesize - 1);
|
|
ops.datbuf = NULL;
|
|
ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
|
|
MTD_OPS_PLACE_OOB;
|
|
|
|
if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
|
|
return -EINVAL;
|
|
|
|
ops.oobbuf = memdup_user(ptr, length);
|
|
if (IS_ERR(ops.oobbuf))
|
|
return PTR_ERR(ops.oobbuf);
|
|
|
|
start &= ~((uint64_t)mtd->writesize - 1);
|
|
ret = mtd_write_oob(mtd, start, &ops);
|
|
|
|
if (ops.oobretlen > 0xFFFFFFFFU)
|
|
ret = -EOVERFLOW;
|
|
retlen = ops.oobretlen;
|
|
if (copy_to_user(retp, &retlen, sizeof(length)))
|
|
ret = -EFAULT;
|
|
|
|
kfree(ops.oobbuf);
|
|
return ret;
|
|
}
|
|
|
|
static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
|
|
uint64_t start, uint32_t length, void __user *ptr,
|
|
uint32_t __user *retp)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_oob_ops ops;
|
|
int ret = 0;
|
|
|
|
if (length > 4096)
|
|
return -EINVAL;
|
|
|
|
if (!access_ok(VERIFY_WRITE, ptr, length))
|
|
return -EFAULT;
|
|
|
|
ops.ooblen = length;
|
|
ops.ooboffs = start & (mtd->writesize - 1);
|
|
ops.datbuf = NULL;
|
|
ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
|
|
MTD_OPS_PLACE_OOB;
|
|
|
|
if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
|
|
return -EINVAL;
|
|
|
|
ops.oobbuf = kmalloc(length, GFP_KERNEL);
|
|
if (!ops.oobbuf)
|
|
return -ENOMEM;
|
|
|
|
start &= ~((uint64_t)mtd->writesize - 1);
|
|
ret = mtd_read_oob(mtd, start, &ops);
|
|
|
|
if (put_user(ops.oobretlen, retp))
|
|
ret = -EFAULT;
|
|
else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
|
|
ops.oobretlen))
|
|
ret = -EFAULT;
|
|
|
|
kfree(ops.oobbuf);
|
|
|
|
/*
|
|
* NAND returns -EBADMSG on ECC errors, but it returns the OOB
|
|
* data. For our userspace tools it is important to dump areas
|
|
* with ECC errors!
|
|
* For kernel internal usage it also might return -EUCLEAN
|
|
* to signal the caller that a bitflip has occured and has
|
|
* been corrected by the ECC algorithm.
|
|
*
|
|
* Note: currently the standard NAND function, nand_read_oob_std,
|
|
* does not calculate ECC for the OOB area, so do not rely on
|
|
* this behavior unless you have replaced it with your own.
|
|
*/
|
|
if (mtd_is_bitflip_or_eccerr(ret))
|
|
return 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Copies (and truncates, if necessary) data from the larger struct,
|
|
* nand_ecclayout, to the smaller, deprecated layout struct,
|
|
* nand_ecclayout_user. This is necessary only to support the deprecated
|
|
* API ioctl ECCGETLAYOUT while allowing all new functionality to use
|
|
* nand_ecclayout flexibly (i.e. the struct may change size in new
|
|
* releases without requiring major rewrites).
|
|
*/
|
|
static int shrink_ecclayout(const struct nand_ecclayout *from,
|
|
struct nand_ecclayout_user *to)
|
|
{
|
|
int i;
|
|
|
|
if (!from || !to)
|
|
return -EINVAL;
|
|
|
|
memset(to, 0, sizeof(*to));
|
|
|
|
to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
|
|
for (i = 0; i < to->eccbytes; i++)
|
|
to->eccpos[i] = from->eccpos[i];
|
|
|
|
for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
|
|
if (from->oobfree[i].length == 0 &&
|
|
from->oobfree[i].offset == 0)
|
|
break;
|
|
to->oobavail += from->oobfree[i].length;
|
|
to->oobfree[i] = from->oobfree[i];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
|
|
struct blkpg_ioctl_arg __user *arg)
|
|
{
|
|
struct blkpg_ioctl_arg a;
|
|
struct blkpg_partition p;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
|
|
return -EFAULT;
|
|
|
|
if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
|
|
return -EFAULT;
|
|
|
|
switch (a.op) {
|
|
case BLKPG_ADD_PARTITION:
|
|
|
|
/* Only master mtd device must be used to add partitions */
|
|
if (mtd_is_partition(mtd))
|
|
return -EINVAL;
|
|
|
|
return mtd_add_partition(mtd, p.devname, p.start, p.length);
|
|
|
|
case BLKPG_DEL_PARTITION:
|
|
|
|
if (p.pno < 0)
|
|
return -EINVAL;
|
|
|
|
return mtd_del_partition(mtd, p.pno);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int mtdchar_write_ioctl(struct mtd_info *mtd,
|
|
struct mtd_write_req __user *argp)
|
|
{
|
|
struct mtd_write_req req;
|
|
struct mtd_oob_ops ops;
|
|
void __user *usr_data, *usr_oob;
|
|
int ret;
|
|
|
|
if (copy_from_user(&req, argp, sizeof(req)) ||
|
|
!access_ok(VERIFY_READ, req.usr_data, req.len) ||
|
|
!access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
|
|
return -EFAULT;
|
|
if (!mtd->_write_oob)
|
|
return -EOPNOTSUPP;
|
|
|
|
ops.mode = req.mode;
|
|
ops.len = (size_t)req.len;
|
|
ops.ooblen = (size_t)req.ooblen;
|
|
ops.ooboffs = 0;
|
|
|
|
usr_data = (void __user *)(uintptr_t)req.usr_data;
|
|
usr_oob = (void __user *)(uintptr_t)req.usr_oob;
|
|
|
|
if (req.usr_data) {
|
|
ops.datbuf = memdup_user(usr_data, ops.len);
|
|
if (IS_ERR(ops.datbuf))
|
|
return PTR_ERR(ops.datbuf);
|
|
} else {
|
|
ops.datbuf = NULL;
|
|
}
|
|
|
|
if (req.usr_oob) {
|
|
ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
|
|
if (IS_ERR(ops.oobbuf)) {
|
|
kfree(ops.datbuf);
|
|
return PTR_ERR(ops.oobbuf);
|
|
}
|
|
} else {
|
|
ops.oobbuf = NULL;
|
|
}
|
|
|
|
ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
|
|
|
|
kfree(ops.datbuf);
|
|
kfree(ops.oobbuf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
void __user *argp = (void __user *)arg;
|
|
int ret = 0;
|
|
u_long size;
|
|
struct mtd_info_user info;
|
|
|
|
pr_debug("MTD_ioctl\n");
|
|
|
|
size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
|
|
if (cmd & IOC_IN) {
|
|
if (!access_ok(VERIFY_READ, argp, size))
|
|
return -EFAULT;
|
|
}
|
|
if (cmd & IOC_OUT) {
|
|
if (!access_ok(VERIFY_WRITE, argp, size))
|
|
return -EFAULT;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case MEMGETREGIONCOUNT:
|
|
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMGETREGIONINFO:
|
|
{
|
|
uint32_t ur_idx;
|
|
struct mtd_erase_region_info *kr;
|
|
struct region_info_user __user *ur = argp;
|
|
|
|
if (get_user(ur_idx, &(ur->regionindex)))
|
|
return -EFAULT;
|
|
|
|
if (ur_idx >= mtd->numeraseregions)
|
|
return -EINVAL;
|
|
|
|
kr = &(mtd->eraseregions[ur_idx]);
|
|
|
|
if (put_user(kr->offset, &(ur->offset))
|
|
|| put_user(kr->erasesize, &(ur->erasesize))
|
|
|| put_user(kr->numblocks, &(ur->numblocks)))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
}
|
|
|
|
case MEMGETINFO:
|
|
memset(&info, 0, sizeof(info));
|
|
info.type = mtd->type;
|
|
info.flags = mtd->flags;
|
|
info.size = mtd->size;
|
|
info.erasesize = mtd->erasesize;
|
|
info.writesize = mtd->writesize;
|
|
info.oobsize = mtd->oobsize;
|
|
/* The below field is obsolete */
|
|
info.padding = 0;
|
|
if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMERASE:
|
|
case MEMERASE64:
|
|
{
|
|
struct erase_info *erase;
|
|
|
|
if(!(file->f_mode & FMODE_WRITE))
|
|
return -EPERM;
|
|
|
|
erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
|
|
if (!erase)
|
|
ret = -ENOMEM;
|
|
else {
|
|
wait_queue_head_t waitq;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
init_waitqueue_head(&waitq);
|
|
|
|
if (cmd == MEMERASE64) {
|
|
struct erase_info_user64 einfo64;
|
|
|
|
if (copy_from_user(&einfo64, argp,
|
|
sizeof(struct erase_info_user64))) {
|
|
kfree(erase);
|
|
return -EFAULT;
|
|
}
|
|
erase->addr = einfo64.start;
|
|
erase->len = einfo64.length;
|
|
} else {
|
|
struct erase_info_user einfo32;
|
|
|
|
if (copy_from_user(&einfo32, argp,
|
|
sizeof(struct erase_info_user))) {
|
|
kfree(erase);
|
|
return -EFAULT;
|
|
}
|
|
erase->addr = einfo32.start;
|
|
erase->len = einfo32.length;
|
|
}
|
|
erase->mtd = mtd;
|
|
erase->callback = mtdchar_erase_callback;
|
|
erase->priv = (unsigned long)&waitq;
|
|
|
|
/*
|
|
FIXME: Allow INTERRUPTIBLE. Which means
|
|
not having the wait_queue head on the stack.
|
|
|
|
If the wq_head is on the stack, and we
|
|
leave because we got interrupted, then the
|
|
wq_head is no longer there when the
|
|
callback routine tries to wake us up.
|
|
*/
|
|
ret = mtd_erase(mtd, erase);
|
|
if (!ret) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
add_wait_queue(&waitq, &wait);
|
|
if (erase->state != MTD_ERASE_DONE &&
|
|
erase->state != MTD_ERASE_FAILED)
|
|
schedule();
|
|
remove_wait_queue(&waitq, &wait);
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
|
|
}
|
|
kfree(erase);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MEMWRITEOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf_user->length */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
|
|
buf.ptr, &buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf_user->start */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
|
|
buf.ptr, &buf_user->start);
|
|
break;
|
|
}
|
|
|
|
case MEMWRITEOOB64:
|
|
{
|
|
struct mtd_oob_buf64 buf;
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB64:
|
|
{
|
|
struct mtd_oob_buf64 buf;
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMWRITE:
|
|
{
|
|
ret = mtdchar_write_ioctl(mtd,
|
|
(struct mtd_write_req __user *)arg);
|
|
break;
|
|
}
|
|
|
|
case MEMLOCK:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
ret = mtd_lock(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
case MEMUNLOCK:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
ret = mtd_unlock(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
case MEMISLOCKED:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
ret = mtd_is_locked(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
/* Legacy interface */
|
|
case MEMGETOOBSEL:
|
|
{
|
|
struct nand_oobinfo oi;
|
|
|
|
if (!mtd->ecclayout)
|
|
return -EOPNOTSUPP;
|
|
if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
|
|
return -EINVAL;
|
|
|
|
oi.useecc = MTD_NANDECC_AUTOPLACE;
|
|
memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
|
|
memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
|
|
sizeof(oi.oobfree));
|
|
oi.eccbytes = mtd->ecclayout->eccbytes;
|
|
|
|
if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case MEMGETBADBLOCK:
|
|
{
|
|
loff_t offs;
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
return -EFAULT;
|
|
return mtd_block_isbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
case MEMSETBADBLOCK:
|
|
{
|
|
loff_t offs;
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
return -EFAULT;
|
|
return mtd_block_markbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_MTD_OTP
|
|
case OTPSELECT:
|
|
{
|
|
int mode;
|
|
if (copy_from_user(&mode, argp, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
mfi->mode = MTD_FILE_MODE_NORMAL;
|
|
|
|
ret = otp_select_filemode(mfi, mode);
|
|
|
|
file->f_pos = 0;
|
|
break;
|
|
}
|
|
|
|
case OTPGETREGIONCOUNT:
|
|
case OTPGETREGIONINFO:
|
|
{
|
|
struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
switch (mfi->mode) {
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
|
ret = mtd_get_fact_prot_info(mtd, buf, 4096);
|
|
break;
|
|
case MTD_FILE_MODE_OTP_USER:
|
|
ret = mtd_get_user_prot_info(mtd, buf, 4096);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (ret >= 0) {
|
|
if (cmd == OTPGETREGIONCOUNT) {
|
|
int nbr = ret / sizeof(struct otp_info);
|
|
ret = copy_to_user(argp, &nbr, sizeof(int));
|
|
} else
|
|
ret = copy_to_user(argp, buf, ret);
|
|
if (ret)
|
|
ret = -EFAULT;
|
|
}
|
|
kfree(buf);
|
|
break;
|
|
}
|
|
|
|
case OTPLOCK:
|
|
{
|
|
struct otp_info oinfo;
|
|
|
|
if (mfi->mode != MTD_FILE_MODE_OTP_USER)
|
|
return -EINVAL;
|
|
if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
|
|
return -EFAULT;
|
|
ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
/* This ioctl is being deprecated - it truncates the ECC layout */
|
|
case ECCGETLAYOUT:
|
|
{
|
|
struct nand_ecclayout_user *usrlay;
|
|
|
|
if (!mtd->ecclayout)
|
|
return -EOPNOTSUPP;
|
|
|
|
usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
|
|
if (!usrlay)
|
|
return -ENOMEM;
|
|
|
|
shrink_ecclayout(mtd->ecclayout, usrlay);
|
|
|
|
if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
|
|
ret = -EFAULT;
|
|
kfree(usrlay);
|
|
break;
|
|
}
|
|
|
|
case ECCGETSTATS:
|
|
{
|
|
if (copy_to_user(argp, &mtd->ecc_stats,
|
|
sizeof(struct mtd_ecc_stats)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case MTDFILEMODE:
|
|
{
|
|
mfi->mode = 0;
|
|
|
|
switch(arg) {
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
|
case MTD_FILE_MODE_OTP_USER:
|
|
ret = otp_select_filemode(mfi, arg);
|
|
break;
|
|
|
|
case MTD_FILE_MODE_RAW:
|
|
if (!mtd_has_oob(mtd))
|
|
return -EOPNOTSUPP;
|
|
mfi->mode = arg;
|
|
|
|
case MTD_FILE_MODE_NORMAL:
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
file->f_pos = 0;
|
|
break;
|
|
}
|
|
|
|
case BLKPG:
|
|
{
|
|
ret = mtdchar_blkpg_ioctl(mtd,
|
|
(struct blkpg_ioctl_arg __user *)arg);
|
|
break;
|
|
}
|
|
|
|
case BLKRRPART:
|
|
{
|
|
/* No reread partition feature. Just return ok */
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
} /* memory_ioctl */
|
|
|
|
static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&mtd_mutex);
|
|
ret = mtdchar_ioctl(file, cmd, arg);
|
|
mutex_unlock(&mtd_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
struct mtd_oob_buf32 {
|
|
u_int32_t start;
|
|
u_int32_t length;
|
|
compat_caddr_t ptr; /* unsigned char* */
|
|
};
|
|
|
|
#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
|
|
#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
|
|
|
|
static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
void __user *argp = compat_ptr(arg);
|
|
int ret = 0;
|
|
|
|
mutex_lock(&mtd_mutex);
|
|
|
|
switch (cmd) {
|
|
case MEMWRITEOOB32:
|
|
{
|
|
struct mtd_oob_buf32 buf;
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_writeoob(file, mtd, buf.start,
|
|
buf.length, compat_ptr(buf.ptr),
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB32:
|
|
{
|
|
struct mtd_oob_buf32 buf;
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf->start */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_readoob(file, mtd, buf.start,
|
|
buf.length, compat_ptr(buf.ptr),
|
|
&buf_user->start);
|
|
break;
|
|
}
|
|
default:
|
|
ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
|
|
}
|
|
|
|
mutex_unlock(&mtd_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
/*
|
|
* try to determine where a shared mapping can be made
|
|
* - only supported for NOMMU at the moment (MMU can't doesn't copy private
|
|
* mappings)
|
|
*/
|
|
#ifndef CONFIG_MMU
|
|
static unsigned long mtdchar_get_unmapped_area(struct file *file,
|
|
unsigned long addr,
|
|
unsigned long len,
|
|
unsigned long pgoff,
|
|
unsigned long flags)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
unsigned long offset;
|
|
int ret;
|
|
|
|
if (addr != 0)
|
|
return (unsigned long) -EINVAL;
|
|
|
|
if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
|
|
return (unsigned long) -EINVAL;
|
|
|
|
offset = pgoff << PAGE_SHIFT;
|
|
if (offset > mtd->size - len)
|
|
return (unsigned long) -EINVAL;
|
|
|
|
ret = mtd_get_unmapped_area(mtd, len, offset, flags);
|
|
return ret == -EOPNOTSUPP ? -ENOSYS : ret;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* set up a mapping for shared memory segments
|
|
*/
|
|
static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
struct map_info *map = mtd->priv;
|
|
unsigned long start;
|
|
unsigned long off;
|
|
u32 len;
|
|
|
|
if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
|
|
off = vma->vm_pgoff << PAGE_SHIFT;
|
|
start = map->phys;
|
|
len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
|
|
start &= PAGE_MASK;
|
|
if ((vma->vm_end - vma->vm_start + off) > len)
|
|
return -EINVAL;
|
|
|
|
off += start;
|
|
vma->vm_pgoff = off >> PAGE_SHIFT;
|
|
vma->vm_flags |= VM_IO | VM_RESERVED;
|
|
|
|
#ifdef pgprot_noncached
|
|
if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
#endif
|
|
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot))
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
return -ENOSYS;
|
|
#else
|
|
return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
|
|
#endif
|
|
}
|
|
|
|
static const struct file_operations mtd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = mtdchar_lseek,
|
|
.read = mtdchar_read,
|
|
.write = mtdchar_write,
|
|
.unlocked_ioctl = mtdchar_unlocked_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mtdchar_compat_ioctl,
|
|
#endif
|
|
.open = mtdchar_open,
|
|
.release = mtdchar_close,
|
|
.mmap = mtdchar_mmap,
|
|
#ifndef CONFIG_MMU
|
|
.get_unmapped_area = mtdchar_get_unmapped_area,
|
|
#endif
|
|
};
|
|
|
|
static const struct super_operations mtd_ops = {
|
|
.drop_inode = generic_delete_inode,
|
|
.statfs = simple_statfs,
|
|
};
|
|
|
|
static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
|
|
}
|
|
|
|
static struct file_system_type mtd_inodefs_type = {
|
|
.name = "mtd_inodefs",
|
|
.mount = mtd_inodefs_mount,
|
|
.kill_sb = kill_anon_super,
|
|
};
|
|
|
|
static int __init init_mtdchar(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
|
|
"mtd", &mtd_fops);
|
|
if (ret < 0) {
|
|
pr_notice("Can't allocate major number %d for "
|
|
"Memory Technology Devices.\n", MTD_CHAR_MAJOR);
|
|
return ret;
|
|
}
|
|
|
|
ret = register_filesystem(&mtd_inodefs_type);
|
|
if (ret) {
|
|
pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
|
|
goto err_unregister_chdev;
|
|
}
|
|
return ret;
|
|
|
|
err_unregister_chdev:
|
|
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
|
|
return ret;
|
|
}
|
|
|
|
static void __exit cleanup_mtdchar(void)
|
|
{
|
|
unregister_filesystem(&mtd_inodefs_type);
|
|
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
|
|
}
|
|
|
|
module_init(init_mtdchar);
|
|
module_exit(cleanup_mtdchar);
|
|
|
|
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
MODULE_DESCRIPTION("Direct character-device access to MTD devices");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
|