All of lore.kernel.org
 help / color / mirror / Atom feed
From: dsneddon-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org
To: linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH] spi: spidev: Fix user-space memory access.
Date: Thu, 19 Jun 2014 21:52:15 -0000	[thread overview]
Message-ID: <4277a609d7431f34663d19a006a5ada6.squirrel@www.codeaurora.org> (raw)

When the spidev module tries to access the user space memory passed in via
an IOCTL the compat_ptr function should be called to ensure
compatibility between kernel space and user space.

Signed-off-by: Dan Sneddon <dsneddon-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 drivers/spi/spidev.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3bc23b..3a45158 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -252,14 +252,16 @@ static int spidev_message(struct spidev_data *spidev,
                if (u_tmp->rx_buf) {
                        k_tmp->rx_buf = buf;
                        if (!access_ok(VERIFY_WRITE, (u8 __user *)
-                                               (uintptr_t) u_tmp->rx_buf,
+                                               (uintptr_t)compat_ptr( +  
                                                    u_tmp->rx_buf),
                                                u_tmp->len))
                                goto done;
                }
                if (u_tmp->tx_buf) {
                        k_tmp->tx_buf = buf;
                        if (copy_from_user(buf, (const u8 __user *)
-                                               (uintptr_t) u_tmp->tx_buf,
+                                               (uintptr_t)compat_ptr( +  
                                                    u_tmp->tx_buf),
                                        u_tmp->len))
                                goto done;
                }
@@ -294,8 +296,8 @@ static int spidev_message(struct spidev_data *spidev,
        for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) {
                if (u_tmp->rx_buf) {
                        if (__copy_to_user((u8 __user *)
-                                       (uintptr_t) u_tmp->rx_buf, buf, - 
                                     u_tmp->len)) {
+
(uintptr_t)compat_ptr(u_tmp->rx_buf),
+                                       buf, u_tmp->len)) {
                                status = -EFAULT;
                                goto done;
                        }
--
1.8.4






---
sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

--
To unsubscribe from this list: send the line "unsubscribe linux-spi" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

WARNING: multiple messages have this Message-ID
From: dsneddon@codeaurora.org
To: linux-spi@vger.kernel.org
Cc: broonie@kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org
Subject: [PATCH] spi: spidev: Fix user-space memory access.
Date: Thu, 19 Jun 2014 21:52:15 -0000	[thread overview]
Message-ID: <4277a609d7431f34663d19a006a5ada6.squirrel@www.codeaurora.org> (raw)

When the spidev module tries to access the user space memory passed in via
an IOCTL the compat_ptr function should be called to ensure
compatibility between kernel space and user space.

Signed-off-by: Dan Sneddon <dsneddon@codeaurora.org>
---
 drivers/spi/spidev.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index e3bc23b..3a45158 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -252,14 +252,16 @@ static int spidev_message(struct spidev_data *spidev,
                if (u_tmp->rx_buf) {
                        k_tmp->rx_buf = buf;
                        if (!access_ok(VERIFY_WRITE, (u8 __user *)
-                                               (uintptr_t) u_tmp->rx_buf,
+                                               (uintptr_t)compat_ptr( +  
                                                    u_tmp->rx_buf),
                                                u_tmp->len))
                                goto done;
                }
                if (u_tmp->tx_buf) {
                        k_tmp->tx_buf = buf;
                        if (copy_from_user(buf, (const u8 __user *)
-                                               (uintptr_t) u_tmp->tx_buf,
+                                               (uintptr_t)compat_ptr( +  
                                                    u_tmp->tx_buf),
                                        u_tmp->len))
                                goto done;
                }
@@ -294,8 +296,8 @@ static int spidev_message(struct spidev_data *spidev,
        for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) {
                if (u_tmp->rx_buf) {
                        if (__copy_to_user((u8 __user *)
-                                       (uintptr_t) u_tmp->rx_buf, buf, - 
                                     u_tmp->len)) {
+
(uintptr_t)compat_ptr(u_tmp->rx_buf),
+                                       buf, u_tmp->len)) {
                                status = -EFAULT;
                                goto done;
                        }
--
1.8.4






---
sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation


             reply	other threads:[~2014-06-19 21:52 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-19 21:52 dsneddon-sgV2jX0FEOL9JmXXK+q4OQ [this message]
2014-06-19 21:52 ` dsneddon
2014-06-20 20:40 ` dsneddon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4277a609d7431f34663d19a006a5ada6.squirrel@www.codeaurora.org \
    --to=dsneddon-sgv2jx0feol9jmxxk+q4oq@public.gmane.org \
    --cc=broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
    --cc=linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --subject='Re: [PATCH] spi: spidev: Fix user-space memory access.' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.