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Merge branch 'mtd/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux

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Pull mtd fix from Richard Weinberger.

* 'mtd/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux:
  mtd: properly check all write ioctls for permissions
This commit is contained in:
Linus Torvalds 2020-08-03 11:46:22 -07:00
commit 99f6cf61f1
1 changed files with 47 additions and 9 deletions
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56
drivers/mtd/mtdchar.c
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@ -355,9 +355,6 @@ static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
uint32_t retlen;
int ret = 0;
if (!(file->f_mode & FMODE_WRITE))
return -EPERM;
if (length > 4096)
return -EINVAL;
@ -643,6 +640,48 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
pr_debug("MTD_ioctl\n");
/*
* Check the file mode to require "dangerous" commands to have write
* permissions.
*/
switch (cmd) {
/* "safe" commands */
case MEMGETREGIONCOUNT:
case MEMGETREGIONINFO:
case MEMGETINFO:
case MEMREADOOB:
case MEMREADOOB64:
case MEMLOCK:
case MEMUNLOCK:
case MEMISLOCKED:
case MEMGETOOBSEL:
case MEMGETBADBLOCK:
case MEMSETBADBLOCK:
case OTPSELECT:
case OTPGETREGIONCOUNT:
case OTPGETREGIONINFO:
case OTPLOCK:
case ECCGETLAYOUT:
case ECCGETSTATS:
case MTDFILEMODE:
case BLKPG:
case BLKRRPART:
break;
/* "dangerous" commands */
case MEMERASE:
case MEMERASE64:
case MEMWRITEOOB:
case MEMWRITEOOB64:
case MEMWRITE:
if (!(file->f_mode & FMODE_WRITE))
return -EPERM;
break;
default:
return -ENOTTY;
}
switch (cmd) {
case MEMGETREGIONCOUNT:
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
@ -690,9 +729,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
{
struct erase_info *erase;
if(!(file->f_mode & FMODE_WRITE))
return -EPERM;
erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
if (!erase)
ret = -ENOMEM;
@ -985,9 +1021,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
ret = 0;
break;
}
default:
ret = -ENOTTY;
}
return ret;
@ -1031,6 +1064,11 @@ static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
struct mtd_oob_buf32 buf;
struct mtd_oob_buf32 __user *buf_user = argp;
if (!(file->f_mode & FMODE_WRITE)) {
ret = -EPERM;
break;
}
if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
else