[PATCH] mtd: properly check all write ioctls for permissions

[PATCH] mtd: properly check all write ioctls for permissions

[Greg Kroah-Hartman]

When doing a "write" ioctl call, properly check that we have permissions
to do so before copying anything from userspace or anything else so we
can "fail fast".  This includes also covering the MEMWRITE ioctl which
previously missed checking for this.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/mtd/mtdchar.c | 54 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 45 insertions(+), 9 deletions(-)

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index c5935b2f9cd1..52c120f9fb0d 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -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 +1064,9 @@ 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))
+			return -EPERM;
+
 		if (copy_from_user(&buf, argp, sizeof(buf)))
 			ret = -EFAULT;
 		else
-- 
2.27.0


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

Re: [PATCH] mtd: properly check all write ioctls for permissions

[Greg Kroah-Hartman]

On Thu, Jul 16, 2020 at 01:53:46PM +0200, Greg Kroah-Hartman wrote:
> When doing a "write" ioctl call, properly check that we have permissions
> to do so before copying anything from userspace or anything else so we
> can "fail fast".  This includes also covering the MEMWRITE ioctl which
> previously missed checking for this.
> 
> Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> Cc: Richard Weinberger <richard@nod.at>
> Cc: Vignesh Raghavendra <vigneshr@ti.com>
> Cc: stable <stable@kernel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/mtd/mtdchar.c | 54 +++++++++++++++++++++++++++++++++++--------
>  1 file changed, 45 insertions(+), 9 deletions(-)

Any objection to this patch getting into 5.8-final?

I can take this through one of my trees if you all give me an ack :)

thanks,

greg k-h

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

Re: [PATCH] mtd: properly check all write ioctls for permissions

[Richard Weinberger]

On Thu, Jul 23, 2020 at 1:19 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Thu, Jul 16, 2020 at 01:53:46PM +0200, Greg Kroah-Hartman wrote:
> > When doing a "write" ioctl call, properly check that we have permissions
> > to do so before copying anything from userspace or anything else so we
> > can "fail fast".  This includes also covering the MEMWRITE ioctl which
> > previously missed checking for this.
> >
> > Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> > Cc: Richard Weinberger <richard@nod.at>
> > Cc: Vignesh Raghavendra <vigneshr@ti.com>
> > Cc: stable <stable@kernel.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > ---
> >  drivers/mtd/mtdchar.c | 54 +++++++++++++++++++++++++++++++++++--------
> >  1 file changed, 45 insertions(+), 9 deletions(-)
>
> Any objection to this patch getting into 5.8-final?

Well, I hoped to get some acks/reviews...

Applied to mtd/fixes! :-)

-- 
Thanks,
//richard

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/