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* [PATCH v2] virt: vbox: Only copy_from_user the request-header once
@ 2018-05-08 13:50 Wenwen Wang
  2018-05-08 14:09 ` Hans de Goede
  0 siblings, 1 reply; 2+ messages in thread
From: Wenwen Wang @ 2018-05-08 13:50 UTC (permalink / raw)
  To: Wenwen Wang
  Cc: Kangjie Lu, Hans de Goede, Arnd Bergmann, Greg Kroah-Hartman, open list

In vbg_misc_device_ioctl(), the header of the ioctl argument is copied from
the userspace pointer 'arg' and saved to the kernel object 'hdr'. Then the
'version', 'size_in', and 'size_out' fields of 'hdr' are verified.

Before this commit, after the checks a buffer for the entire request would
be allocated and then all data including the verified header would be
copied from the userspace 'arg' pointer again.

Given that the 'arg' pointer resides in userspace, a malicious userspace
process can race to change the data pointed to by 'arg' between the two
copies. By doing so, the user can bypass the verifications on the ioctl
argument.

This commit fixes this by using the already checked copy of the header
to fill the header part of the allocated buffer and only copying the
remainder of the data from userspace.

Signed-off-by: Wenwen Wang <wang6495@umn.edu>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/virt/vboxguest/vboxguest_linux.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/virt/vboxguest/vboxguest_linux.c b/drivers/virt/vboxguest/vboxguest_linux.c
index 398d226..6e2a961 100644
--- a/drivers/virt/vboxguest/vboxguest_linux.c
+++ b/drivers/virt/vboxguest/vboxguest_linux.c
@@ -121,7 +121,9 @@ static long vbg_misc_device_ioctl(struct file *filp, unsigned int req,
 	if (!buf)
 		return -ENOMEM;
 
-	if (copy_from_user(buf, (void *)arg, hdr.size_in)) {
+	*((struct vbg_ioctl_hdr *)buf) = hdr;
+	if (copy_from_user(buf + sizeof(hdr), (void *)arg + sizeof(hdr),
+			   hdr.size_in - sizeof(hdr))) {
 		ret = -EFAULT;
 		goto out;
 	}
-- 
2.7.4

^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH v2] virt: vbox: Only copy_from_user the request-header once
  2018-05-08 13:50 [PATCH v2] virt: vbox: Only copy_from_user the request-header once Wenwen Wang
@ 2018-05-08 14:09 ` Hans de Goede
  0 siblings, 0 replies; 2+ messages in thread
From: Hans de Goede @ 2018-05-08 14:09 UTC (permalink / raw)
  To: Wenwen Wang; +Cc: Kangjie Lu, Arnd Bergmann, Greg Kroah-Hartman, open list

Hi,

On 08-05-18 15:50, Wenwen Wang wrote:
> In vbg_misc_device_ioctl(), the header of the ioctl argument is copied from
> the userspace pointer 'arg' and saved to the kernel object 'hdr'. Then the
> 'version', 'size_in', and 'size_out' fields of 'hdr' are verified.
> 
> Before this commit, after the checks a buffer for the entire request would
> be allocated and then all data including the verified header would be
> copied from the userspace 'arg' pointer again.
> 
> Given that the 'arg' pointer resides in userspace, a malicious userspace
> process can race to change the data pointed to by 'arg' between the two
> copies. By doing so, the user can bypass the verifications on the ioctl
> argument.
> 
> This commit fixes this by using the already checked copy of the header
> to fill the header part of the allocated buffer and only copying the
> remainder of the data from userspace.
> 
> Signed-off-by: Wenwen Wang <wang6495@umn.edu>

Thanks, looks good:

Reviewed-by: Hans de Goede <hdegoede@redhat.com>

Regards,

Hans



> ---
>   drivers/virt/vboxguest/vboxguest_linux.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/virt/vboxguest/vboxguest_linux.c b/drivers/virt/vboxguest/vboxguest_linux.c
> index 398d226..6e2a961 100644
> --- a/drivers/virt/vboxguest/vboxguest_linux.c
> +++ b/drivers/virt/vboxguest/vboxguest_linux.c
> @@ -121,7 +121,9 @@ static long vbg_misc_device_ioctl(struct file *filp, unsigned int req,
>   	if (!buf)
>   		return -ENOMEM;
>   
> -	if (copy_from_user(buf, (void *)arg, hdr.size_in)) {
> +	*((struct vbg_ioctl_hdr *)buf) = hdr;
> +	if (copy_from_user(buf + sizeof(hdr), (void *)arg + sizeof(hdr),
> +			   hdr.size_in - sizeof(hdr))) {
>   		ret = -EFAULT;
>   		goto out;
>   	}
> 

^ permalink raw reply	[flat|nested] 2+ messages in thread

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