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virt: vbox: Sanity-check parameter types for hgcm-calls coming from userspace 

Userspace can make host function calls, called hgcm-calls through the
/dev/vboxguest device.

In this case we should not accept all hgcm-function-parameter-types, some
are only valid for in kernel calls.

This commit adds proper hgcm-function-parameter-type validation to the
ioctl for doing a hgcm-call from userspace.

Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2019-04-04 14:39:09 +02:00 committed by Greg Kroah-Hartman
parent 0b0509508b
commit cf4f2ad6b8
1 changed files with 31 additions and 0 deletions
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31
drivers/virt/vboxguest/vboxguest_core.c
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@ -1298,6 +1298,20 @@ static int vbg_ioctl_hgcm_disconnect(struct vbg_dev *gdev,
return ret;
}
static bool vbg_param_valid(enum vmmdev_hgcm_function_parameter_type type)
{
switch (type) {
case VMMDEV_HGCM_PARM_TYPE_32BIT:
case VMMDEV_HGCM_PARM_TYPE_64BIT:
case VMMDEV_HGCM_PARM_TYPE_LINADDR:
case VMMDEV_HGCM_PARM_TYPE_LINADDR_IN:
case VMMDEV_HGCM_PARM_TYPE_LINADDR_OUT:
return true;
default:
return false;
}
}
static int vbg_ioctl_hgcm_call(struct vbg_dev *gdev,
struct vbg_session *session, bool f32bit,
struct vbg_ioctl_hgcm_call *call)
@ -1333,6 +1347,23 @@ static int vbg_ioctl_hgcm_call(struct vbg_dev *gdev,
}
call->hdr.size_out = actual_size;
/* Validate parameter types */
if (f32bit) {
struct vmmdev_hgcm_function_parameter32 *parm =
VBG_IOCTL_HGCM_CALL_PARMS32(call);
for (i = 0; i < call->parm_count; i++)
if (!vbg_param_valid(parm[i].type))
return -EINVAL;
} else {
struct vmmdev_hgcm_function_parameter *parm =
VBG_IOCTL_HGCM_CALL_PARMS(call);
for (i = 0; i < call->parm_count; i++)
if (!vbg_param_valid(parm[i].type))
return -EINVAL;
}
/*
* Validate the client id.
*/