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user namespace: usb: make usb urbs user namespace aware (v2)

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Add to the dev_state and alloc_async structures the user namespace
corresponding to the uid and euid.  Pass these to kill_pid_info_as_uid(),
which can then implement a proper, user-namespace-aware uid check.

Changelog:
Sep 20: Per Oleg's suggestion: Instead of caching and passing user namespace,
	uid, and euid each separately, pass a struct cred.
Sep 26: Address Alan Stern's comments: don't define a struct cred at
	usbdev_open(), and take and put a cred at async_completed() to
	ensure it lasts for the duration of kill_pid_info_as_cred().

Signed-off-by: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Serge Hallyn
2011-09-26 10:45:18 -05:00
committed by Greg Kroah-Hartman
parent edb2b255a0
commit d178bc3a70
3 changed files with 31 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/usb/core/devio.c
View File

@@ -46,6 +46,7 @@
#include <linux/cdev.h>
#include <linux/notifier.h>
#include <linux/security.h>
#include <linux/user_namespace.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/moduleparam.h>
@@ -68,7 +69,7 @@ struct dev_state {
wait_queue_head_t wait; /* wake up if a request completed */
unsigned int discsignr;
struct pid *disc_pid;
uid_t disc_uid, disc_euid;
const struct cred *cred;
void __user *disccontext;
unsigned long ifclaimed;
u32 secid;
@@ -79,7 +80,7 @@ struct async {
struct list_head asynclist;
struct dev_state *ps;
struct pid *pid;
uid_t uid, euid;
const struct cred *cred;
unsigned int signr;
unsigned int ifnum;
void __user *userbuffer;
@@ -248,6 +249,7 @@ static struct async *alloc_async(unsigned int numisoframes)
static void free_async(struct async *as)
{
put_pid(as->pid);
put_cred(as->cred);
kfree(as->urb->transfer_buffer);
kfree(as->urb->setup_packet);
usb_free_urb(as->urb);
@@ -393,9 +395,8 @@ static void async_completed(struct urb *urb)
struct dev_state *ps = as->ps;
struct siginfo sinfo;
struct pid *pid = NULL;
uid_t uid = 0;
uid_t euid = 0;
u32 secid = 0;
const struct cred *cred = NULL;
int signr;
spin_lock(&ps->lock);
@@ -408,8 +409,7 @@ static void async_completed(struct urb *urb)
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = as->userurb;
pid = get_pid(as->pid);
uid = as->uid;
euid = as->euid;
cred = get_cred(as->cred);
secid = as->secid;
}
snoop(&urb->dev->dev, "urb complete\n");
@@ -423,9 +423,9 @@ static void async_completed(struct urb *urb)
spin_unlock(&ps->lock);
if (signr) {
kill_pid_info_as_uid(sinfo.si_signo, &sinfo, pid, uid,
euid, secid);
kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
put_pid(pid);
put_cred(cred);
}
wake_up(&ps->wait);
@@ -672,7 +672,6 @@ static int usbdev_open(struct inode *inode, struct file *file)
{
struct usb_device *dev = NULL;
struct dev_state *ps;
const struct cred *cred = current_cred();
int ret;
ret = -ENOMEM;
@@ -722,8 +721,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
ps->disc_pid = get_pid(task_pid(current));
ps->disc_uid = cred->uid;
ps->disc_euid = cred->euid;
ps->cred = get_current_cred();
ps->disccontext = NULL;
ps->ifclaimed = 0;
security_task_getsecid(current, &ps->secid);
@@ -765,6 +763,7 @@ static int usbdev_release(struct inode *inode, struct file *file)
usb_unlock_device(dev);
usb_put_dev(dev);
put_pid(ps->disc_pid);
put_cred(ps->cred);
as = async_getcompleted(ps);
while (as) {
@@ -1065,7 +1064,6 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
struct usb_host_endpoint *ep;
struct async *as;
struct usb_ctrlrequest *dr = NULL;
const struct cred *cred = current_cred();
unsigned int u, totlen, isofrmlen;
int ret, ifnum = -1;
int is_in;
@@ -1279,8 +1277,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
as->signr = uurb->signr;
as->ifnum = ifnum;
as->pid = get_pid(task_pid(current));
as->uid = cred->uid;
as->euid = cred->euid;
as->cred = get_current_cred();
security_task_getsecid(current, &as->secid);
if (!is_in && uurb->buffer_length > 0) {
if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
@@ -1998,9 +1995,8 @@ static void usbdev_remove(struct usb_device *udev)
sinfo.si_errno = EPIPE;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = ps->disccontext;
kill_pid_info_as_uid(ps->discsignr, &sinfo,
ps->disc_pid, ps->disc_uid,
ps->disc_euid, ps->secid);
kill_pid_info_as_cred(ps->discsignr, &sinfo,
ps->disc_pid, ps->cred, ps->secid);
}
}
}