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[PATCH] usb: fixup usb so it uses struct pid

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The problem with remembering a user space process by its pid is that it is
possible that the process will exit, pid wrap around will occur.
Converting to a struct pid avoid that problem, and paves the way for
implementing a pid namespace.

Also since usb is the only user of kill_proc_info_as_uid rename
kill_proc_info_as_uid to kill_pid_info_as_uid and have the new version take
a struct pid.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman
2006-10-02 02:17:28 -07:00
committed by Linus Torvalds
parent 43fa1adb93
commit 2425c08b37
5 changed files with 13 additions and 11 deletions
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10
drivers/usb/core/devio.c
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@@ -65,7 +65,7 @@ DEFINE_MUTEX(usbfs_mutex);
struct async {
struct list_head asynclist;
struct dev_state *ps;
pid_t pid;
struct pid *pid;
uid_t uid, euid;
unsigned int signr;
unsigned int ifnum;
@@ -225,6 +225,7 @@ static struct async *alloc_async(unsigned int numisoframes)
static void free_async(struct async *as)
{
put_pid(as->pid);
kfree(as->urb->transfer_buffer);
kfree(as->urb->setup_packet);
usb_free_urb(as->urb);
@@ -317,7 +318,7 @@ static void async_completed(struct urb *urb, struct pt_regs *regs)
sinfo.si_errno = as->urb->status;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = as->userurb;
kill_proc_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
as->euid, as->secid);
}
snoop(&urb->dev->dev, "urb complete\n");
@@ -573,7 +574,7 @@ static int usbdev_open(struct inode *inode, struct file *file)
INIT_LIST_HEAD(&ps->async_completed);
init_waitqueue_head(&ps->wait);
ps->discsignr = 0;
ps->disc_pid = current->pid;
ps->disc_pid = get_pid(task_pid(current));
ps->disc_uid = current->uid;
ps->disc_euid = current->euid;
ps->disccontext = NULL;
@@ -611,6 +612,7 @@ static int usbdev_release(struct inode *inode, struct file *file)
usb_autosuspend_device(dev, 1);
usb_unlock_device(dev);
usb_put_dev(dev);
put_pid(ps->disc_pid);
kfree(ps);
return 0;
}
@@ -1063,7 +1065,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
as->userbuffer = NULL;
as->signr = uurb->signr;
as->ifnum = ifnum;
as->pid = current->pid;
as->pid = get_pid(task_pid(current));
as->uid = current->uid;
as->euid = current->euid;
security_task_getsecid(current, &as->secid);