linux-kernel - [PATCH 13/59] CRED: Wrap task credential accesses in the USB driver

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Message-ID: <20080827134649.19980.36926.stgit@warthog.procyon.org.uk>
Date:	Wed, 27 Aug 2008 14:46:49 +0100
From:	David Howells <dhowells@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-security-module@...r.kernel.org,
	David Howells <dhowells@...hat.com>,
	Serge Hallyn <serue@...ibm.com>,
	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org
Subject: [PATCH 13/59] CRED: Wrap task credential accesses in the USB driver

Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: James Morris <jmorris@...ei.org>
Acked-by: Serge Hallyn <serue@...ibm.com>
Cc: Greg Kroah-Hartman <gregkh@...e.de>
Cc: linux-usb@...r.kernel.org
---

 drivers/usb/core/devio.c |    8 ++++----
 drivers/usb/core/inode.c |    4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)


diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index c1018e7..c84dfdc 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -617,8 +617,8 @@ 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 = current->uid;
-	ps->disc_euid = current->euid;
+	ps->disc_uid = current_uid();
+	ps->disc_euid = current_euid();
 	ps->disccontext = NULL;
 	ps->ifclaimed = 0;
 	security_task_getsecid(current, &ps->secid);
@@ -1172,8 +1172,8 @@ 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 = current->uid;
-	as->euid = current->euid;
+	as->uid = current_uid();
+	as->euid = current_euid();
 	security_task_getsecid(current, &as->secid);
 	if (!is_in) {
 		if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 736508e..c62e48b 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -277,8 +277,8 @@ static struct inode *usbfs_get_inode (struct super_block *sb, int mode, dev_t de
 
 	if (inode) {
 		inode->i_mode = mode;
-		inode->i_uid = current->fsuid;
-		inode->i_gid = current->fsgid;
+		inode->i_uid = current_fsuid();
+		inode->i_gid = current_fsgid();
 		inode->i_blocks = 0;
 		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 		switch (mode & S_IFMT) {

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