CRED: Use creds in file structs

Attach creds to file structs and discard f_uid/f_gid.

file_operations::open() methods (such as hppfs_open()) should use file->f_cred
rather than current_cred().  At the moment file->f_cred will be current_cred()
at this point.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Signed-off-by: James Morris <jmorris@namei.org>

11 files changed, 31 insertions, 27 deletions

diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 972b2d2b8401..09786e496375 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -1085,8 +1085,8 @@ static int vpe_open(struct inode *inode, struct file *filp)
         v->load_addr = NULL;
         v->len = 0;
 
-        v->uid = filp->f_uid;
-        v->gid = filp->f_gid;
+        v->uid = filp->f_cred->fsuid;
+        v->gid = filp->f_cred->fsgid;
 
 #ifdef CONFIG_MIPS_APSP_KSPD
         /* get kspd to tell us when a syscall_exit happens */
diff --git a/drivers/isdn/hysdn/hysdn_procconf.c b/drivers/isdn/hysdn/hysdn_procconf.c
index 484299b031f8..8f9f4912de32 100644
--- a/drivers/isdn/hysdn/hysdn_procconf.c
+++ b/drivers/isdn/hysdn/hysdn_procconf.c
@@ -246,7 +246,8 @@ hysdn_conf_open(struct inode *ino, struct file *filep)
         }
         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
                 hysdn_addlog(card, "config open for uid=%d gid=%d mode=0x%x",
-                             filep->f_uid, filep->f_gid, filep->f_mode);
+                             filep->f_cred->fsuid, filep->f_cred->fsgid,
+                             filep->f_mode);
 
         if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
                 /* write only access -> write boot file or conf line */
@@ -331,7 +332,8 @@ hysdn_conf_close(struct inode *ino, struct file *filep)
         }
         if (card->debug_flags & (LOG_PROC_OPEN | LOG_PROC_ALL))
                 hysdn_addlog(card, "config close for uid=%d gid=%d mode=0x%x",
-                             filep->f_uid, filep->f_gid, filep->f_mode);
+                             filep->f_cred->fsuid, filep->f_cred->fsgid,
+                             filep->f_mode);
 
         if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
                 /* write only access -> write boot file or conf line */
diff --git a/fs/coda/file.c b/fs/coda/file.c
index 29137ff3ca67..5a8769985494 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -174,7 +174,7 @@ int coda_release(struct inode *coda_inode, struct file *coda_file)
         BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
 
         err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode),
-                          coda_flags, coda_file->f_uid);
+                          coda_flags, coda_file->f_cred->fsuid);
 
         host_inode = cfi->cfi_container->f_path.dentry->d_inode;
         cii = ITOC(coda_inode);
diff --git a/fs/file_table.c b/fs/file_table.c
index bc4563fe791d..0fbcacc3ea75 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -36,7 +36,9 @@ static struct percpu_counter nr_files __cacheline_aligned_in_smp;
 
 static inline void file_free_rcu(struct rcu_head *head)
 {
-        struct file *f =  container_of(head, struct file, f_u.fu_rcuhead);
+        struct file *f = container_of(head, struct file, f_u.fu_rcuhead);
+
+        put_cred(f->f_cred);
         kmem_cache_free(filp_cachep, f);
 }
 
@@ -121,8 +123,7 @@ struct file *get_empty_filp(void)
         INIT_LIST_HEAD(&f->f_u.fu_list);
         atomic_long_set(&f->f_count, 1);
         rwlock_init(&f->f_owner.lock);
-        f->f_uid = cred->fsuid;
-        f->f_gid = cred->fsgid;
+        f->f_cred = get_cred(cred);
         eventpoll_init_file(f);
         /* f->f_version: 0 */
         return f;
diff --git a/fs/hppfs/hppfs.c b/fs/hppfs/hppfs.c
index 795e2c130ad7..b278f7f52024 100644
--- a/fs/hppfs/hppfs.c
+++ b/fs/hppfs/hppfs.c
@@ -426,7 +426,7 @@ static int file_mode(int fmode)
 
 static int hppfs_open(struct inode *inode, struct file *file)
 {
-        const struct cred *cred = current_cred();
+        const struct cred *cred = file->f_cred;
         struct hppfs_private *data;
         struct vfsmount *proc_mnt;
         struct dentry *proc_dentry;
@@ -490,7 +490,7 @@ static int hppfs_open(struct inode *inode, struct file *file)
 
 static int hppfs_dir_open(struct inode *inode, struct file *file)
 {
-        const struct cred *cred = current_cred();
+        const struct cred *cred = file->f_cred;
         struct hppfs_private *data;
         struct vfsmount *proc_mnt;
         struct dentry *proc_dentry;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3bfec1327b8d..c0fb6d81d89b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -827,7 +827,7 @@ struct file {
         fmode_t                 f_mode;
         loff_t                  f_pos;
         struct fown_struct      f_owner;
-        unsigned int            f_uid, f_gid;
+        const struct cred       *f_cred;
         struct file_ra_state    f_ra;
 
         u64                     f_version;
diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
index fc6ce04a3e35..7b5dbe118c09 100644
--- a/net/ipv4/netfilter/ipt_LOG.c
+++ b/net/ipv4/netfilter/ipt_LOG.c
@@ -340,8 +340,8 @@ static void dump_packet(const struct nf_loginfo *info,
                 read_lock_bh(&skb->sk->sk_callback_lock);
                 if (skb->sk->sk_socket && skb->sk->sk_socket->file)
                         printk("UID=%u GID=%u ",
-                                skb->sk->sk_socket->file->f_uid,
-                                skb->sk->sk_socket->file->f_gid);
+                                skb->sk->sk_socket->file->f_cred->fsuid,
+                                skb->sk->sk_socket->file->f_cred->fsgid);
                 read_unlock_bh(&skb->sk->sk_callback_lock);
         }
 
diff --git a/net/ipv6/netfilter/ip6t_LOG.c b/net/ipv6/netfilter/ip6t_LOG.c
index caa441d09567..871d157cec4e 100644
--- a/net/ipv6/netfilter/ip6t_LOG.c
+++ b/net/ipv6/netfilter/ip6t_LOG.c
@@ -364,8 +364,8 @@ static void dump_packet(const struct nf_loginfo *info,
                 read_lock_bh(&skb->sk->sk_callback_lock);
                 if (skb->sk->sk_socket && skb->sk->sk_socket->file)
                         printk("UID=%u GID=%u ",
-                                skb->sk->sk_socket->file->f_uid,
-                                skb->sk->sk_socket->file->f_gid);
+                                skb->sk->sk_socket->file->f_cred->fsuid,
+                                skb->sk->sk_socket->file->f_cred->fsgid);
                 read_unlock_bh(&skb->sk->sk_callback_lock);
         }
 
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 41e0105d3828..38f9efd90e8d 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -474,8 +474,9 @@ __build_packet_message(struct nfulnl_instance *inst,
         if (skb->sk) {
                 read_lock_bh(&skb->sk->sk_callback_lock);
                 if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
-                        __be32 uid = htonl(skb->sk->sk_socket->file->f_uid);
-                        __be32 gid = htonl(skb->sk->sk_socket->file->f_gid);
+                        struct file *file = skb->sk->sk_socket->file;
+                        __be32 uid = htonl(file->f_cred->fsuid);
+                        __be32 gid = htonl(file->f_cred->fsgid);
                         /* need to unlock here since NLA_PUT may goto */
                         read_unlock_bh(&skb->sk->sk_callback_lock);
                         NLA_PUT_BE32(inst->skb, NFULA_UID, uid);
diff --git a/net/netfilter/xt_owner.c b/net/netfilter/xt_owner.c
index f19ebd9b78f5..22b2a5e881ea 100644
--- a/net/netfilter/xt_owner.c
+++ b/net/netfilter/xt_owner.c
@@ -34,12 +34,12 @@ owner_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par)
                 return false;
 
         if (info->match & IPT_OWNER_UID)
-                if ((filp->f_uid != info->uid) ^
+                if ((filp->f_cred->fsuid != info->uid) ^
                     !!(info->invert & IPT_OWNER_UID))
                         return false;
 
         if (info->match & IPT_OWNER_GID)
-                if ((filp->f_gid != info->gid) ^
+                if ((filp->f_cred->fsgid != info->gid) ^
                     !!(info->invert & IPT_OWNER_GID))
                         return false;
 
@@ -60,12 +60,12 @@ owner_mt6_v0(const struct sk_buff *skb, const struct xt_match_param *par)
                 return false;
 
         if (info->match & IP6T_OWNER_UID)
-                if ((filp->f_uid != info->uid) ^
+                if ((filp->f_cred->fsuid != info->uid) ^
                     !!(info->invert & IP6T_OWNER_UID))
                         return false;
 
         if (info->match & IP6T_OWNER_GID)
-                if ((filp->f_gid != info->gid) ^
+                if ((filp->f_cred->fsgid != info->gid) ^
                     !!(info->invert & IP6T_OWNER_GID))
                         return false;
 
@@ -93,14 +93,14 @@ owner_mt(const struct sk_buff *skb, const struct xt_match_param *par)
                        (XT_OWNER_UID | XT_OWNER_GID)) == 0;
 
         if (info->match & XT_OWNER_UID)
-                if ((filp->f_uid >= info->uid_min &&
-                    filp->f_uid <= info->uid_max) ^
+                if ((filp->f_cred->fsuid >= info->uid_min &&
+                    filp->f_cred->fsuid <= info->uid_max) ^
                     !(info->invert & XT_OWNER_UID))
                         return false;
 
         if (info->match & XT_OWNER_GID)
-                if ((filp->f_gid >= info->gid_min &&
-                    filp->f_gid <= info->gid_max) ^
+                if ((filp->f_cred->fsgid >= info->gid_min &&
+                    filp->f_cred->fsgid <= info->gid_max) ^
                     !(info->invert & XT_OWNER_GID))
                         return false;
 
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 0ebaff637e31..0ef4e3065bcd 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -260,14 +260,14 @@ static u32 flow_get_rtclassid(const struct sk_buff *skb)
 static u32 flow_get_skuid(const struct sk_buff *skb)
 {
         if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
-                return skb->sk->sk_socket->file->f_uid;
+                return skb->sk->sk_socket->file->f_cred->fsuid;
         return 0;
 }
 
 static u32 flow_get_skgid(const struct sk_buff *skb)
 {
         if (skb->sk && skb->sk->sk_socket && skb->sk->sk_socket->file)
-                return skb->sk->sk_socket->file->f_gid;
+                return skb->sk->sk_socket->file->f_cred->fsgid;
         return 0;
 }