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Subject[PATCH 56/59] CRED: Wrap task credential accesses in the networking subsystem
Date
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@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: netdev@vger.kernel.org
---
include/net/scm.h | 4 ++--
net/core/dev.c | 8 ++++++--
net/core/scm.c | 8 ++++----
net/socket.c | 4 ++--
4 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/include/net/scm.h b/include/net/scm.h
index 06df126..f160116 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -54,8 +54,8 @@ static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
struct scm_cookie *scm)
{
struct task_struct *p = current;
- scm->creds.uid = p->uid;
- scm->creds.gid = p->gid;
+ scm->creds.uid = current_uid();
+ scm->creds.gid = current_gid();
scm->creds.pid = task_tgid_vnr(p);
scm->fp = NULL;
scm->seq = 0;
diff --git a/net/core/dev.c b/net/core/dev.c
index 447aff0..b0a1ee8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2914,6 +2914,8 @@ int netdev_set_master(struct net_device *slave, struct net_device *master)
static int __dev_set_promiscuity(struct net_device *dev, int inc)
{
unsigned short old_flags = dev->flags;
+ uid_t uid;
+ gid_t gid;

ASSERT_RTNL();

@@ -2938,15 +2940,17 @@ static int __dev_set_promiscuity(struct net_device *dev, int inc)
printk(KERN_INFO "device %s %s promiscuous mode\n",
dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
"left");
- if (audit_enabled)
+ if (audit_enabled) {
+ current_uid_gid(&uid, &gid);
audit_log(current->audit_context, GFP_ATOMIC,
AUDIT_ANOM_PROMISCUOUS,
"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
dev->name, (dev->flags & IFF_PROMISC),
(old_flags & IFF_PROMISC),
audit_get_loginuid(current),
- current->uid, current->gid,
+ uid, gid,
audit_get_sessionid(current));
+ }

if (dev->change_rx_flags)
dev->change_rx_flags(dev, IFF_PROMISC);
diff --git a/net/core/scm.c b/net/core/scm.c
index 10f5c65..4681d8f 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -45,10 +45,10 @@
static __inline__ int scm_check_creds(struct ucred *creds)
{
if ((creds->pid == task_tgid_vnr(current) || capable(CAP_SYS_ADMIN)) &&
- ((creds->uid == current->uid || creds->uid == current->euid ||
- creds->uid == current->suid) || capable(CAP_SETUID)) &&
- ((creds->gid == current->gid || creds->gid == current->egid ||
- creds->gid == current->sgid) || capable(CAP_SETGID))) {
+ ((creds->uid == current_uid() || creds->uid == current_euid() ||
+ creds->uid == current_suid()) || capable(CAP_SETUID)) &&
+ ((creds->gid == current_gid() || creds->gid == current_egid() ||
+ creds->gid == current_sgid()) || capable(CAP_SETGID))) {
return 0;
}
return -EPERM;
diff --git a/net/socket.c b/net/socket.c
index 77990d3..58f9c51 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -491,8 +491,8 @@ static struct socket *sock_alloc(void)
sock = SOCKET_I(inode);

inode->i_mode = S_IFSOCK | S_IRWXUGO;
- inode->i_uid = current->fsuid;
- inode->i_gid = current->fsgid;
+ inode->i_uid = current_fsuid();
+ inode->i_gid = current_fsgid();

get_cpu_var(sockets_in_use)++;
put_cpu_var(sockets_in_use);


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