usb: devio: Add ioctl to disallow detaching kernel USB drivers.

The new USBDEVFS_DROP_PRIVILEGES ioctl allows a process to voluntarily
relinquish the ability to issue other ioctls that may interfere with
other processes and drivers that have claimed an interface on the
device.

This commit also includes a simple utility to be able to test the
ioctl, located at Documentation/usb/usbdevfs-drop-permissions.c

Example (with qemu-kvm's input device):

    $ lsusb
    ...
    Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd

    $ usb-devices
    ...
    C:  #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA
    I:  If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=02 Driver=usbhid

    $ sudo ./usbdevfs-drop-permissions /dev/bus/usb/001/002
    OK: privileges dropped!
    Available options:
    [0] Exit now
    [1] Reset device. Should fail if device is in use
    [2] Claim 4 interfaces. Should succeed where not in use
    [3] Narrow interface permission mask
    Which option shall I run?: 1
    ERROR: USBDEVFS_RESET failed! (1 - Operation not permitted)
    Which test shall I run next?: 2
    ERROR claiming if 0 (1 - Operation not permitted)
    ERROR claiming if 1 (1 - Operation not permitted)
    ERROR claiming if 2 (1 - Operation not permitted)
    ERROR claiming if 3 (1 - Operation not permitted)
    Which test shall I run next?: 0

After unbinding usbhid:

    $ usb-devices
    ...
    I:  If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=00 Prot=02 Driver=(none)

    $ sudo ./usbdevfs-drop-permissions /dev/bus/usb/001/002
    ...
    Which option shall I run?: 2
    OK: claimed if 0
    ERROR claiming if 1 (1 - Operation not permitted)
    ERROR claiming if 2 (1 - Operation not permitted)
    ERROR claiming if 3 (1 - Operation not permitted)
    Which test shall I run next?: 1
    OK: USBDEVFS_RESET succeeded
    Which test shall I run next?: 0

After unbinding usbhid and restricting the mask:

    $ sudo ./usbdevfs-drop-permissions /dev/bus/usb/001/002
    ...
    Which option shall I run?: 3
    Insert new mask: 0
    OK: privileges dropped!
    Which test shall I run next?: 2
    ERROR claiming if 0 (1 - Operation not permitted)
    ERROR claiming if 1 (1 - Operation not permitted)
    ERROR claiming if 2 (1 - Operation not permitted)
    ERROR claiming if 3 (1 - Operation not permitted)

Signed-off-by: Reilly Grant <reillyg@chromium.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Emilio López <emilio.lopez@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Reilly Grant 2016-02-21 18:38:01 -03:00 committed by Greg Kroah-Hartman
parent 3d0712deb0
commit d883f52e1f
4 changed files with 192 additions and 5 deletions

View File

@ -732,6 +732,18 @@ usbdev_ioctl (int fd, int ifno, unsigned request, void *param)
or SET_INTERFACE.
</para></warning></listitem></varlistentry>
<varlistentry><term>USBDEVFS_DROP_PRIVILEGES</term>
<listitem><para>This is used to relinquish the ability
to do certain operations which are considered to be
privileged on a usbfs file descriptor.
This includes claiming arbitrary interfaces, resetting
a device on which there are currently claimed interfaces
from other users, and issuing USBDEVFS_IOCTL calls.
The ioctl parameter is a 32 bit mask of interfaces
the user is allowed to claim on this file descriptor.
You may issue this ioctl more than one time to narrow
said mask.
</para></listitem></varlistentry>
</variablelist>
</sect2>

View File

@ -0,0 +1,120 @@
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>
#include <linux/usbdevice_fs.h>
/* For building without an updated set of headers */
#ifndef USBDEVFS_DROP_PRIVILEGES
#define USBDEVFS_DROP_PRIVILEGES _IOW('U', 30, __u32)
#define USBDEVFS_CAP_DROP_PRIVILEGES 0x40
#endif
void drop_privileges(int fd, uint32_t mask)
{
int res;
res = ioctl(fd, USBDEVFS_DROP_PRIVILEGES, &mask);
if (res)
printf("ERROR: USBDEVFS_DROP_PRIVILEGES returned %d\n", res);
else
printf("OK: privileges dropped!\n");
}
void reset_device(int fd)
{
int res;
res = ioctl(fd, USBDEVFS_RESET);
if (!res)
printf("OK: USBDEVFS_RESET succeeded\n");
else
printf("ERROR: reset failed! (%d - %s)\n",
-res, strerror(-res));
}
void claim_some_intf(int fd)
{
int i, res;
for (i = 0; i < 4; i++) {
res = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &i);
if (!res)
printf("OK: claimed if %d\n", i);
else
printf("ERROR claiming if %d (%d - %s)\n",
i, -res, strerror(-res));
}
}
int main(int argc, char *argv[])
{
uint32_t mask, caps;
int c, fd;
fd = open(argv[1], O_RDWR);
if (fd < 0) {
printf("Failed to open file\n");
goto err_fd;
}
/*
* check if dropping privileges is supported,
* bail on systems where the capability is not present
*/
ioctl(fd, USBDEVFS_GET_CAPABILITIES, &caps);
if (!(caps & USBDEVFS_CAP_DROP_PRIVILEGES)) {
printf("DROP_PRIVILEGES not supported\n");
goto err;
}
/*
* Drop privileges but keep the ability to claim all
* free interfaces (i.e., those not used by kernel drivers)
*/
drop_privileges(fd, -1U);
printf("Available options:\n"
"[0] Exit now\n"
"[1] Reset device. Should fail if device is in use\n"
"[2] Claim 4 interfaces. Should succeed where not in use\n"
"[3] Narrow interface permission mask\n"
"Which option shall I run?: ");
while (scanf("%d", &c) == 1) {
switch (c) {
case 0:
goto exit;
case 1:
reset_device(fd);
break;
case 2:
claim_some_intf(fd);
break;
case 3:
printf("Insert new mask: ");
scanf("%x", &mask);
drop_privileges(fd, mask);
break;
default:
printf("I don't recognize that\n");
}
printf("Which test shall I run next?: ");
}
exit:
close(fd);
return 0;
err:
close(fd);
err_fd:
return 1;
}

View File

@ -79,6 +79,8 @@ struct usb_dev_state {
unsigned long ifclaimed;
u32 secid;
u32 disabled_bulk_eps;
bool privileges_dropped;
unsigned long interface_allowed_mask;
};
struct usb_memory {
@ -748,6 +750,10 @@ static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
if (test_bit(ifnum, &ps->ifclaimed))
return 0;
if (ps->privileges_dropped &&
!test_bit(ifnum, &ps->interface_allowed_mask))
return -EACCES;
intf = usb_ifnum_to_if(dev, ifnum);
if (!intf)
err = -ENOENT;
@ -985,7 +991,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
int ret;
ret = -ENOMEM;
ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
if (!ps)
goto out_free_ps;
@ -1013,17 +1019,15 @@ static int usbdev_open(struct inode *inode, struct file *file)
ps->dev = dev;
ps->file = file;
ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
spin_lock_init(&ps->lock);
INIT_LIST_HEAD(&ps->list);
INIT_LIST_HEAD(&ps->async_pending);
INIT_LIST_HEAD(&ps->async_completed);
INIT_LIST_HEAD(&ps->memory_list);
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
ps->disc_pid = get_pid(task_pid(current));
ps->cred = get_current_cred();
ps->disccontext = NULL;
ps->ifclaimed = 0;
security_task_getsecid(current, &ps->secid);
smp_wmb();
list_add_tail(&ps->list, &dev->filelist);
@ -1324,6 +1328,28 @@ static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
static int proc_resetdevice(struct usb_dev_state *ps)
{
struct usb_host_config *actconfig = ps->dev->actconfig;
struct usb_interface *interface;
int i, number;
/* Don't allow a device reset if the process has dropped the
* privilege to do such things and any of the interfaces are
* currently claimed.
*/
if (ps->privileges_dropped && actconfig) {
for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
interface = actconfig->interface[i];
number = interface->cur_altsetting->desc.bInterfaceNumber;
if (usb_interface_claimed(interface) &&
!test_bit(number, &ps->ifclaimed)) {
dev_warn(&ps->dev->dev,
"usbfs: interface %d claimed by %s while '%s' resets device\n",
number, interface->dev.driver->name, current->comm);
return -EACCES;
}
}
}
return usb_reset_device(ps->dev);
}
@ -2090,6 +2116,9 @@ static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
struct usb_interface *intf = NULL;
struct usb_driver *driver = NULL;
if (ps->privileges_dropped)
return -EACCES;
/* alloc buffer */
size = _IOC_SIZE(ctl->ioctl_code);
if (size > 0) {
@ -2215,7 +2244,8 @@ static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
__u32 caps;
caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP;
USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
USBDEVFS_CAP_DROP_PRIVILEGES;
if (!ps->dev->bus->no_stop_on_short)
caps |= USBDEVFS_CAP_BULK_CONTINUATION;
if (ps->dev->bus->sg_tablesize)
@ -2242,6 +2272,9 @@ static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
if (intf->dev.driver) {
struct usb_driver *driver = to_usb_driver(intf->dev.driver);
if (ps->privileges_dropped)
return -EACCES;
if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
strncmp(dc.driver, intf->dev.driver->name,
sizeof(dc.driver)) != 0)
@ -2298,6 +2331,23 @@ static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
return r;
}
static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
{
u32 data;
if (copy_from_user(&data, arg, sizeof(data)))
return -EFAULT;
/* This is an one way operation. Once privileges are
* dropped, you cannot regain them. You may however reissue
* this ioctl to shrink the allowed interfaces mask.
*/
ps->interface_allowed_mask &= data;
ps->privileges_dropped = true;
return 0;
}
/*
* NOTE: All requests here that have interface numbers as parameters
* are assuming that somehow the configuration has been prevented from
@ -2486,6 +2536,9 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
case USBDEVFS_FREE_STREAMS:
ret = proc_free_streams(ps, p);
break;
case USBDEVFS_DROP_PRIVILEGES:
ret = proc_drop_privileges(ps, p);
break;
}
done:

View File

@ -135,6 +135,7 @@ struct usbdevfs_hub_portinfo {
#define USBDEVFS_CAP_BULK_SCATTER_GATHER 0x08
#define USBDEVFS_CAP_REAP_AFTER_DISCONNECT 0x10
#define USBDEVFS_CAP_MMAP 0x20
#define USBDEVFS_CAP_DROP_PRIVILEGES 0x40
/* USBDEVFS_DISCONNECT_CLAIM flags & struct */
@ -188,5 +189,6 @@ struct usbdevfs_streams {
#define USBDEVFS_DISCONNECT_CLAIM _IOR('U', 27, struct usbdevfs_disconnect_claim)
#define USBDEVFS_ALLOC_STREAMS _IOR('U', 28, struct usbdevfs_streams)
#define USBDEVFS_FREE_STREAMS _IOR('U', 29, struct usbdevfs_streams)
#define USBDEVFS_DROP_PRIVILEGES _IOW('U', 30, __u32)
#endif /* _UAPI_LINUX_USBDEVICE_FS_H */