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Date: Wed, 06 Aug 2008 16:38:05 +0100
From: David Howells <dhowells@...hat.com>
To: jmorris@...ei.org, akpm@...ux-foundation.org, morgan@...nel.org
Cc: sfr@...b.auug.org.au, dhowells@...hat.com, viro@....linux.org.uk,
casey@...aufler-ca.com, linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 10/24] CRED: Wrap current->cred and a few other accessors [ver
#7]
Wrap current->cred and a few other accessors to hide their actual
implementation.
Signed-off-by: David Howells <dhowells@...hat.com>
Acked-by: James Morris <jmorris@...ei.org>
Acked-by: Serge Hallyn <serue@...ibm.com>
---
drivers/net/tun.c | 8 +-
drivers/usb/core/devio.c | 10 +-
fs/binfmt_elf.c | 10 +-
fs/binfmt_elf_fdpic.c | 9 +-
fs/exec.c | 5 +
fs/fcntl.c | 3 -
fs/file_table.c | 7 +-
fs/hugetlbfs/inode.c | 5 +
fs/ioprio.c | 4 -
fs/smbfs/dir.c | 3 -
include/linux/cred.h | 187 +++++++++++++++++++++++++++++++----------
include/linux/securebits.h | 2
ipc/mqueue.c | 2
ipc/shm.c | 4 -
kernel/sys.c | 59 ++++++-------
kernel/uid16.c | 31 ++++---
net/core/scm.c | 2
net/sunrpc/auth.c | 14 ++-
security/commoncap.c | 2
security/keys/process_keys.c | 4 -
security/keys/request_key.c | 11 +-
security/selinux/exports.c | 8 +-
security/selinux/xfrm.c | 6 +
security/smack/smack_access.c | 2
security/smack/smack_lsm.c | 26 +++---
security/smack/smackfs.c | 4 -
26 files changed, 269 insertions(+), 159 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 4174855..0b618bb 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -644,6 +644,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
struct tun_net *tn;
struct tun_struct *tun;
struct net_device *dev;
+ const struct cred *cred = current_cred();
int err;
tn = net_generic(net, tun_net_id);
@@ -654,11 +655,12 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
/* Check permissions */
if (((tun->owner != -1 &&
- current_euid() != tun->owner) ||
+ cred->euid != tun->owner) ||
(tun->group != -1 &&
- current_egid() != tun->group)) &&
- !capable(CAP_NET_ADMIN))
+ cred->egid != tun->group)) &&
+ !capable(CAP_NET_ADMIN)) {
return -EPERM;
+ }
}
else if (__dev_get_by_name(net, ifr->ifr_name))
return -EINVAL;
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index 6c7c115..70829cd 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -573,6 +573,7 @@ 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;
lock_kernel();
@@ -616,8 +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 = cred->uid;
+ ps->disc_euid = cred->euid;
ps->disccontext = NULL;
ps->ifclaimed = 0;
security_task_getsecid(current, &ps->secid);
@@ -964,6 +965,7 @@ 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;
@@ -1171,8 +1173,8 @@ 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 = cred->uid;
+ as->euid = cred->euid;
security_task_getsecid(current, &as->secid);
if (!is_in) {
if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 0bf141e..8692d4a 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -157,7 +157,7 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
int items;
elf_addr_t *elf_info;
int ei_index = 0;
- struct task_struct *tsk = current;
+ const struct cred *cred = current_cred();
struct vm_area_struct *vma;
/*
@@ -223,10 +223,10 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
NEW_AUX_ENT(AT_BASE, interp_load_addr);
NEW_AUX_ENT(AT_FLAGS, 0);
NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
- NEW_AUX_ENT(AT_UID, tsk->cred->uid);
- NEW_AUX_ENT(AT_EUID, tsk->cred->euid);
- NEW_AUX_ENT(AT_GID, tsk->cred->gid);
- NEW_AUX_ENT(AT_EGID, tsk->cred->egid);
+ NEW_AUX_ENT(AT_UID, cred->uid);
+ NEW_AUX_ENT(AT_EUID, cred->euid);
+ NEW_AUX_ENT(AT_GID, cred->gid);
+ NEW_AUX_ENT(AT_EGID, cred->egid);
NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
NEW_AUX_ENT(AT_EXECFN, bprm->exec);
if (k_platform) {
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 779423e..6232e55 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -465,6 +465,7 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
{
unsigned long sp, csp, nitems;
elf_caddr_t __user *argv, *envp;
+ const struct cred *cred = current_cred();
size_t platform_len = 0, len;
char *k_platform;
char __user *u_platform, *p;
@@ -586,10 +587,10 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr);
NEW_AUX_ENT(AT_FLAGS, 0);
NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr);
- NEW_AUX_ENT(AT_UID, (elf_addr_t) current->cred->uid);
- NEW_AUX_ENT(AT_EUID, (elf_addr_t) current->cred->euid);
- NEW_AUX_ENT(AT_GID, (elf_addr_t) current->cred->gid);
- NEW_AUX_ENT(AT_EGID, (elf_addr_t) current->cred->egid);
+ NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid);
+ NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid);
+ NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid);
+ NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid);
#ifdef ARCH_DLINFO
nr = 0;
diff --git a/fs/exec.c b/fs/exec.c
index 93e9b1c..4867ee1 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1393,6 +1393,7 @@ EXPORT_SYMBOL(set_binfmt);
*/
static int format_corename(char *corename, int nr_threads, long signr)
{
+ const struct cred *cred = current_cred();
const char *pat_ptr = core_pattern;
int ispipe = (*pat_ptr == '|');
char *out_ptr = corename;
@@ -1429,7 +1430,7 @@ static int format_corename(char *corename, int nr_threads, long signr)
/* uid */
case 'u':
rc = snprintf(out_ptr, out_end - out_ptr,
- "%d", current_uid());
+ "%d", cred->uid);
if (rc > out_end - out_ptr)
goto out;
out_ptr += rc;
@@ -1437,7 +1438,7 @@ static int format_corename(char *corename, int nr_threads, long signr)
/* gid */
case 'g':
rc = snprintf(out_ptr, out_end - out_ptr,
- "%d", current_gid());
+ "%d", cred->gid);
if (rc > out_end - out_ptr)
goto out;
out_ptr += rc;
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 63964d8..c594cc0 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -205,13 +205,14 @@ static void f_modown(struct file *filp, struct pid *pid, enum pid_type type,
int __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
int force)
{
+ const struct cred *cred = current_cred();
int err;
err = security_file_set_fowner(filp);
if (err)
return err;
- f_modown(filp, pid, type, current_uid(), current_euid(), force);
+ f_modown(filp, pid, type, cred->uid, cred->euid, force);
return 0;
}
EXPORT_SYMBOL(__f_setown);
diff --git a/fs/file_table.c b/fs/file_table.c
index a807eb0..4183190 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -94,7 +94,7 @@ int proc_nr_files(ctl_table *table, int write, struct file *filp,
*/
struct file *get_empty_filp(void)
{
- struct task_struct *tsk;
+ const struct cred *cred = current_cred();
static int old_max;
struct file * f;
@@ -118,12 +118,11 @@ struct file *get_empty_filp(void)
if (security_file_alloc(f))
goto fail_sec;
- tsk = current;
INIT_LIST_HEAD(&f->f_u.fu_list);
atomic_long_set(&f->f_count, 1);
rwlock_init(&f->f_owner.lock);
- f->f_uid = tsk->cred->fsuid;
- f->f_gid = tsk->cred->fsgid;
+ f->f_uid = cred->fsuid;
+ f->f_gid = cred->fsgid;
eventpoll_init_file(f);
/* f->f_version: 0 */
return f;
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 0cecb9e..9f32c1d 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -951,6 +951,7 @@ struct file *hugetlb_file_setup(const char *name, size_t size)
struct inode *inode;
struct dentry *dentry, *root;
struct qstr quick_string;
+ struct user_struct *user = current_user();
if (!hugetlbfs_vfsmount)
return ERR_PTR(-ENOENT);
@@ -958,7 +959,7 @@ struct file *hugetlb_file_setup(const char *name, size_t size)
if (!can_do_hugetlb_shm())
return ERR_PTR(-EPERM);
- if (!user_shm_lock(size, current->cred->user))
+ if (!user_shm_lock(size, user))
return ERR_PTR(-ENOMEM);
root = hugetlbfs_vfsmount->mnt_root;
@@ -998,7 +999,7 @@ out_inode:
out_dentry:
dput(dentry);
out_shm_unlock:
- user_shm_unlock(size, current->cred->user);
+ user_shm_unlock(size, user);
return ERR_PTR(error);
}
diff --git a/fs/ioprio.c b/fs/ioprio.c
index fa55afc..6d96eac 100644
--- a/fs/ioprio.c
+++ b/fs/ioprio.c
@@ -123,7 +123,7 @@ asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
break;
case IOPRIO_WHO_USER:
if (!who)
- user = current->cred->user;
+ user = current_user();
else
user = find_user(who);
@@ -216,7 +216,7 @@ asmlinkage long sys_ioprio_get(int which, int who)
break;
case IOPRIO_WHO_USER:
if (!who)
- user = current->cred->user;
+ user = current_user();
else
user = find_user(who);
diff --git a/fs/smbfs/dir.c b/fs/smbfs/dir.c
index 9e9bb0d..e7ddd03 100644
--- a/fs/smbfs/dir.c
+++ b/fs/smbfs/dir.c
@@ -667,8 +667,7 @@ smb_make_node(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
attr.ia_mode = mode;
- attr.ia_uid = current_euid();
- attr.ia_gid = current_egid();
+ current_euid_egid(&attr.ia_uid, &attr.ia_gid);
if (!new_valid_dev(dev))
return -EINVAL;
diff --git a/include/linux/cred.h b/include/linux/cred.h
index a0fefc0..45e954d 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -37,15 +37,16 @@ struct group_info {
* get_group_info - Get a reference to a group info structure
* @group_info: The group info to reference
*
- * This must be called with the owning task locked (via task_lock()) when task
- * != current. The reason being that the vast majority of callers are looking
- * at current->group_info, which can not be changed except by the current task.
- * Changing current->group_info requires the task lock, too.
+ * This gets a reference to a set of supplementary groups.
+ *
+ * If the caller is accessing a task's credentials, they must hold the RCU read
+ * lock when reading.
*/
-#define get_group_info(group_info) \
-do { \
- atomic_inc(&(group_info)->usage); \
-} while (0)
+static inline struct group_info *get_group_info(struct group_info *gi)
+{
+ atomic_inc(&gi->usage);
+ return gi;
+}
/**
* put_group_info - Release a reference to a group info structure
@@ -61,7 +62,7 @@ extern struct group_info *groups_alloc(int);
extern void groups_free(struct group_info *);
extern int set_current_groups(struct group_info *);
extern int set_groups(struct cred *, struct group_info *);
-extern int groups_search(struct group_info *, gid_t);
+extern int groups_search(const struct group_info *, gid_t);
/* access the groups "array" with this macro */
#define GROUP_AT(gi, i) \
@@ -123,41 +124,6 @@ struct cred {
spinlock_t lock; /* lock for pointer changes */
};
-#define get_current_user() (get_uid(current->cred->user))
-
-#define task_uid(task) ((task)->cred->uid)
-#define task_gid(task) ((task)->cred->gid)
-#define task_euid(task) ((task)->cred->euid)
-#define task_egid(task) ((task)->cred->egid)
-
-#define current_uid() (current->cred->uid)
-#define current_gid() (current->cred->gid)
-#define current_euid() (current->cred->euid)
-#define current_egid() (current->cred->egid)
-#define current_suid() (current->cred->suid)
-#define current_sgid() (current->cred->sgid)
-#define current_fsuid() (current->cred->fsuid)
-#define current_fsgid() (current->cred->fsgid)
-#define current_cap() (current->cred->cap_effective)
-
-#define current_uid_gid(_uid, _gid) \
-do { \
- *(_uid) = current->cred->uid; \
- *(_gid) = current->cred->gid; \
-} while(0)
-
-#define current_euid_egid(_uid, _gid) \
-do { \
- *(_uid) = current->cred->euid; \
- *(_gid) = current->cred->egid; \
-} while(0)
-
-#define current_fsuid_fsgid(_uid, _gid) \
-do { \
- *(_uid) = current->cred->fsuid; \
- *(_gid) = current->cred->fsgid; \
-} while(0)
-
extern void __put_cred(struct cred *);
extern int copy_creds(struct task_struct *, unsigned long);
@@ -187,4 +153,137 @@ static inline void put_cred(struct cred *cred)
__put_cred(cred);
}
+/**
+ * current_cred - Access the current task's credentials
+ *
+ * Access the credentials of the current task.
+ */
+#define current_cred() \
+ (current->cred)
+
+/**
+ * __task_cred - Access another task's credentials
+ * @task: The task to query
+ *
+ * Access the credentials of another task. The caller must hold the
+ * RCU readlock.
+ *
+ * The caller must make sure task doesn't go away, either by holding a ref on
+ * task or by holding tasklist_lock to prevent it from being unlinked.
+ */
+#define __task_cred(task) \
+ ((const struct cred *)(rcu_dereference((task)->cred)))
+
+/**
+ * get_task_cred - Get another task's credentials
+ * @task: The task to query
+ *
+ * Get the credentials of a task, pinning them so that they can't go away.
+ * Accessing a task's credentials directly is not permitted.
+ *
+ * The caller must make sure task doesn't go away, either by holding a ref on
+ * task or by holding tasklist_lock to prevent it from being unlinked.
+ */
+#define get_task_cred(task) \
+({ \
+ struct cred *__cred; \
+ rcu_read_lock(); \
+ __cred = (struct cred *) __task_cred((task)); \
+ get_cred(__cred); \
+ rcu_read_unlock(); \
+ __cred; \
+})
+
+/**
+ * get_current_cred - Get the current task's credentials
+ *
+ * Get the credentials of the current task, pinning them so that they can't go
+ * away. Accessing the current task's credentials directly is not permitted.
+ */
+#define get_current_cred() \
+ (get_cred(current_cred()))
+
+/**
+ * get_current_user - Get the current task's user_struct
+ *
+ * Get the user record of the current task, pinning it so that it can't go
+ * away.
+ */
+#define get_current_user() \
+({ \
+ struct user_struct *__u; \
+ struct cred *__cred; \
+ __cred = (struct cred *) current_cred(); \
+ __u = get_uid(__cred->user); \
+ __u; \
+})
+
+/**
+ * get_current_groups - Get the current task's supplementary group list
+ *
+ * Get the supplementary group list of the current task, pinning it so that it
+ * can't go away.
+ */
+#define get_current_groups() \
+({ \
+ struct group_info *__groups; \
+ struct cred *__cred; \
+ __cred = (struct cred *) current_cred(); \
+ __groups = get_group_info(__cred->group_info); \
+ __groups; \
+})
+
+#define task_cred_xxx(task, xxx) \
+({ \
+ __typeof__(task->cred->xxx) ___val; \
+ rcu_read_lock(); \
+ ___val = __task_cred((task))->xxx; \
+ rcu_read_unlock(); \
+ ___val; \
+})
+
+#define task_uid(task) (task_cred_xxx((task), uid))
+#define task_euid(task) (task_cred_xxx((task), euid))
+
+#define current_cred_xxx(xxx) \
+({ \
+ current->cred->xxx; \
+})
+
+#define current_uid() (current_cred_xxx(uid))
+#define current_gid() (current_cred_xxx(gid))
+#define current_euid() (current_cred_xxx(euid))
+#define current_egid() (current_cred_xxx(egid))
+#define current_suid() (current_cred_xxx(suid))
+#define current_sgid() (current_cred_xxx(sgid))
+#define current_fsuid() (current_cred_xxx(fsuid))
+#define current_fsgid() (current_cred_xxx(fsgid))
+#define current_cap() (current_cred_xxx(cap_effective))
+#define current_user() (current_cred_xxx(user))
+#define current_security() (current_cred_xxx(security))
+
+#define current_uid_gid(_uid, _gid) \
+do { \
+ const struct cred *__cred; \
+ __cred = current_cred(); \
+ *(_uid) = __cred->uid; \
+ *(_gid) = __cred->gid; \
+} while(0)
+
+#define current_euid_egid(_euid, _egid) \
+do { \
+ const struct cred *__cred; \
+ __cred = current_cred(); \
+ *(_euid) = __cred->euid; \
+ *(_egid) = __cred->egid; \
+} while(0)
+
+#define current_fsuid_fsgid(_fsuid, _fsgid) \
+do { \
+ const struct cred *__cred; \
+ __cred = current_cred(); \
+ *(_fsuid) = __cred->fsuid; \
+ *(_fsgid) = __cred->fsgid; \
+} while(0)
+
#endif /* _LINUX_CRED_H */
diff --git a/include/linux/securebits.h b/include/linux/securebits.h
index 6d38949..d2c5ed8 100644
--- a/include/linux/securebits.h
+++ b/include/linux/securebits.h
@@ -32,7 +32,7 @@
setting is locked or not. A setting which is locked cannot be
changed from user-level. */
#define issecure_mask(X) (1 << (X))
-#define issecure(X) (issecure_mask(X) & current->cred->securebits)
+#define issecure(X) (issecure_mask(X) & current_cred_xxx(securebits))
#define SECURE_ALL_BITS (issecure_mask(SECURE_NOROOT) | \
issecure_mask(SECURE_NO_SETUID_FIXUP) | \
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 4d5c116..f020a77 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -104,6 +104,7 @@ static inline struct mqueue_inode_info *MQUEUE_I(struct inode *inode)
static struct inode *mqueue_get_inode(struct super_block *sb, int mode,
struct mq_attr *attr)
{
+ struct user_struct *u = current_user();
struct inode *inode;
inode = new_inode(sb);
@@ -118,7 +119,6 @@ static struct inode *mqueue_get_inode(struct super_block *sb, int mode,
if (S_ISREG(mode)) {
struct mqueue_inode_info *info;
struct task_struct *p = current;
- struct user_struct *u = p->cred->user;
unsigned long mq_bytes, mq_msg_tblsz;
inode->i_fop = &mqueue_file_operations;
diff --git a/ipc/shm.c b/ipc/shm.c
index da04353..327347b 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -366,7 +366,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
if (shmflg & SHM_HUGETLB) {
/* hugetlb_file_setup takes care of mlock user accounting */
file = hugetlb_file_setup(name, size);
- shp->mlock_user = current->cred->user;
+ shp->mlock_user = current_user();
} else {
int acctflag = VM_ACCOUNT;
/*
@@ -763,7 +763,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
goto out_unlock;
if(cmd==SHM_LOCK) {
- struct user_struct *user = current->cred->user;
+ struct user_struct *user = current_user();
if (!is_file_hugepages(shp->shm_file)) {
err = shmem_lock(shp->shm_file, 1, user);
if (!err && !(shp->shm_perm.mode & SHM_LOCKED)){
diff --git a/kernel/sys.c b/kernel/sys.c
index 48cbb5b..e2a16eb 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -143,6 +143,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
{
struct task_struct *g, *p;
struct user_struct *user;
+ const struct cred *cred = current_cred();
int error = -EINVAL;
struct pid *pgrp;
@@ -176,18 +177,18 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
} while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
- user = current->cred->user;
+ user = cred->user;
if (!who)
- who = current_uid();
- else
- if (who != current_uid() && !(user = find_user(who)))
- goto out_unlock; /* No processes for this user */
+ who = cred->uid;
+ else if ((who != cred->uid) &&
+ !(user = find_user(who)))
+ goto out_unlock; /* No processes for this user */
do_each_thread(g, p)
- if (p->cred->uid == who)
+ if (__task_cred(p)->uid == who)
error = set_one_prio(p, niceval, error);
while_each_thread(g, p);
- if (who != current_uid())
+ if (who != cred->uid)
free_uid(user); /* For find_user() */
break;
}
@@ -207,6 +208,7 @@ asmlinkage long sys_getpriority(int which, int who)
{
struct task_struct *g, *p;
struct user_struct *user;
+ const struct cred *cred = current_cred();
long niceval, retval = -ESRCH;
struct pid *pgrp;
@@ -238,21 +240,21 @@ asmlinkage long sys_getpriority(int which, int who)
} while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
- user = current->cred->user;
+ user = (struct user_struct *) cred->user;
if (!who)
- who = current_uid();
- else
- if (who != current_uid() && !(user = find_user(who)))
- goto out_unlock; /* No processes for this user */
+ who = cred->uid;
+ else if ((who != cred->uid) &&
+ !(user = find_user(who)))
+ goto out_unlock; /* No processes for this user */
do_each_thread(g, p)
- if (p->cred->uid == who) {
+ if (__task_cred(p)->uid == who) {
niceval = 20 - task_nice(p);
if (niceval > retval)
retval = niceval;
}
while_each_thread(g, p);
- if (who != current_uid())
+ if (who != cred->uid)
free_uid(user); /* for find_user() */
break;
}
@@ -743,11 +745,11 @@ asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid)
{
- struct cred *cred = current->cred;
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(cred->uid, ruid)) &&
- !(retval = put_user(cred->euid, euid)))
+ if (!(retval = put_user(cred->uid, ruid)) &&
+ !(retval = put_user(cred->euid, euid)))
retval = put_user(cred->suid, suid);
return retval;
@@ -796,11 +798,11 @@ asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid)
{
- struct cred *cred = current->cred;
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(cred->gid, rgid)) &&
- !(retval = put_user(cred->egid, egid)))
+ if (!(retval = put_user(cred->gid, rgid)) &&
+ !(retval = put_user(cred->egid, egid)))
retval = put_user(cred->sgid, sgid);
return retval;
@@ -1211,7 +1213,7 @@ static void groups_sort(struct group_info *group_info)
}
/* a simple bsearch */
-int groups_search(struct group_info *group_info, gid_t grp)
+int groups_search(const struct group_info *group_info, gid_t grp)
{
unsigned int left, right;
@@ -1280,13 +1282,8 @@ EXPORT_SYMBOL(set_current_groups);
asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist)
{
- struct cred *cred = current->cred;
- int i = 0;
-
- /*
- * SMP: Nobody else can change our grouplist. Thus we are
- * safe.
- */
+ const struct cred *cred = current_cred();
+ int i;
if (gidsetsize < 0)
return -EINVAL;
@@ -1342,8 +1339,9 @@ asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist)
*/
int in_group_p(gid_t grp)
{
- struct cred *cred = current->cred;
+ const struct cred *cred = current_cred();
int retval = 1;
+
if (grp != cred->fsgid)
retval = groups_search(cred->group_info, grp);
return retval;
@@ -1353,8 +1351,9 @@ EXPORT_SYMBOL(in_group_p);
int in_egroup_p(gid_t grp)
{
- struct cred *cred = current->cred;
+ const struct cred *cred = current_cred();
int retval = 1;
+
if (grp != cred->egid)
retval = groups_search(cred->group_info, grp);
return retval;
diff --git a/kernel/uid16.c b/kernel/uid16.c
index 71f07fc..2460c31 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -84,11 +84,12 @@ asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
{
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
- !(retval = put_user(high2lowuid(current->cred->euid), euid)))
- retval = put_user(high2lowuid(current->cred->suid), suid);
+ if (!(retval = put_user(high2lowuid(cred->uid), ruid)) &&
+ !(retval = put_user(high2lowuid(cred->euid), euid)))
+ retval = put_user(high2lowuid(cred->suid), suid);
return retval;
}
@@ -104,11 +105,12 @@ asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
{
+ const struct cred *cred = current_cred();
int retval;
- if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
- !(retval = put_user(high2lowgid(current->cred->egid), egid)))
- retval = put_user(high2lowgid(current->cred->sgid), sgid);
+ if (!(retval = put_user(high2lowgid(cred->gid), rgid)) &&
+ !(retval = put_user(high2lowgid(cred->egid), egid)))
+ retval = put_user(high2lowgid(cred->sgid), sgid);
return retval;
}
@@ -161,25 +163,24 @@ static int groups16_from_user(struct group_info *group_info,
asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
{
- int i = 0;
+ const struct cred *cred = current_cred();
+ int i;
if (gidsetsize < 0)
return -EINVAL;
- get_group_info(current->cred->group_info);
- i = current->cred->group_info->ngroups;
+ i = cred->group_info->ngroups;
if (gidsetsize) {
if (i > gidsetsize) {
i = -EINVAL;
goto out;
}
- if (groups16_to_user(grouplist, current->cred->group_info)) {
+ if (groups16_to_user(grouplist, cred->group_info)) {
i = -EFAULT;
goto out;
}
}
out:
- put_group_info(current->cred->group_info);
return i;
}
@@ -210,20 +211,20 @@ asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
asmlinkage long sys_getuid16(void)
{
- return high2lowuid(current->cred->uid);
+ return high2lowuid(current_uid());
}
asmlinkage long sys_geteuid16(void)
{
- return high2lowuid(current->cred->euid);
+ return high2lowuid(current_euid());
}
asmlinkage long sys_getgid16(void)
{
- return high2lowgid(current->cred->gid);
+ return high2lowgid(current_gid());
}
asmlinkage long sys_getegid16(void)
{
- return high2lowgid(current->cred->egid);
+ return high2lowgid(current_egid());
}
diff --git a/net/core/scm.c b/net/core/scm.c
index c28ca32..f73c44b 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -44,7 +44,7 @@
static __inline__ int scm_check_creds(struct ucred *creds)
{
- struct cred *cred = current->cred;
+ const struct cred *cred = current_cred();
if ((creds->pid == task_tgid_vnr(current) || capable(CAP_SYS_ADMIN)) &&
((creds->uid == cred->uid || creds->uid == cred->euid ||
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
index 9515fef..d218553 100644
--- a/net/sunrpc/auth.c
+++ b/net/sunrpc/auth.c
@@ -350,16 +350,18 @@ EXPORT_SYMBOL_GPL(rpcauth_lookup_credcache);
struct rpc_cred *
rpcauth_lookupcred(struct rpc_auth *auth, int flags)
{
- struct auth_cred acred = {
- .uid = current_fsuid(),
- .gid = current_fsgid(),
- .group_info = current->cred->group_info,
- };
+ struct auth_cred acred;
struct rpc_cred *ret;
+ const struct cred *cred = current_cred();
dprintk("RPC: looking up %s cred\n",
auth->au_ops->au_name);
- get_group_info(acred.group_info);
+
+ memset(&acred, 0, sizeof(acred));
+ acred.uid = cred->fsuid;
+ acred.gid = cred->fsgid;
+ acred.group_info = get_group_info(((struct cred *)cred)->group_info);
+
ret = auth->au_ops->lookup_cred(auth, &acred, flags);
put_group_info(acred.group_info);
return ret;
diff --git a/security/commoncap.c b/security/commoncap.c
index cb4da7d..2de5cbe 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -606,7 +606,7 @@ int cap_task_setnice (struct task_struct *p, int nice)
int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5, long *rc_p)
{
- struct cred *cred = current->cred;
+ struct cred *cred = current_cred();
long error = 0;
switch (option) {
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 248ad13..c9ccbdb 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -42,7 +42,7 @@ struct key_user root_key_user = {
*/
static int install_user_keyrings(void)
{
- struct user_struct *user = current->cred->user;
+ struct user_struct *user = current_user();
struct key *uid_keyring, *session_keyring;
char buf[20];
int ret;
@@ -582,7 +582,7 @@ key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
{
struct request_key_auth *rka;
struct task_struct *t = current;
- struct cred *cred = t->cred;
+ struct cred *cred = current_cred();
struct key *key;
key_ref_t key_ref, skey_ref;
int ret;
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 8ffd86e..650cc3e 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -67,6 +67,7 @@ static int call_sbin_request_key(struct key_construction *cons,
void *aux)
{
struct task_struct *tsk = current;
+ const struct cred *cred = current_cred();
key_serial_t prkey, sskey;
struct key *key = cons->key, *authkey = cons->authkey, *keyring;
char *argv[9], *envp[3], uid_str[12], gid_str[12];
@@ -92,16 +93,16 @@ static int call_sbin_request_key(struct key_construction *cons,
goto error_link;
/* record the UID and GID */
- sprintf(uid_str, "%d", current_fsuid());
- sprintf(gid_str, "%d", current_fsgid());
+ sprintf(uid_str, "%d", cred->fsuid);
+ sprintf(gid_str, "%d", cred->fsgid);
/* we say which key is under construction */
sprintf(key_str, "%d", key->serial);
/* we specify the process's default keyrings */
sprintf(keyring_str[0], "%d",
- tsk->cred->thread_keyring ?
- tsk->cred->thread_keyring->serial : 0);
+ cred->thread_keyring ?
+ cred->thread_keyring->serial : 0);
prkey = 0;
if (tsk->signal->process_keyring)
@@ -114,7 +115,7 @@ static int call_sbin_request_key(struct key_construction *cons,
sskey = rcu_dereference(tsk->signal->session_keyring)->serial;
rcu_read_unlock();
} else {
- sskey = tsk->cred->user->session_keyring->serial;
+ sskey = cred->user->session_keyring->serial;
}
sprintf(keyring_str[2], "%d", sskey);
diff --git a/security/selinux/exports.c b/security/selinux/exports.c
index cf02490..c73aeaa 100644
--- a/security/selinux/exports.c
+++ b/security/selinux/exports.c
@@ -39,9 +39,13 @@ EXPORT_SYMBOL_GPL(selinux_string_to_sid);
int selinux_secmark_relabel_packet_permission(u32 sid)
{
if (selinux_enabled) {
- struct task_security_struct *tsec = current->cred->security;
+ const struct task_security_struct *__tsec;
+ u32 tsid;
- return avc_has_perm(tsec->sid, sid, SECCLASS_PACKET,
+ __tsec = current_security();
+ tsid = __tsec->sid;
+
+ return avc_has_perm(tsid, sid, SECCLASS_PACKET,
PACKET__RELABELTO, NULL);
}
return 0;
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index d7db766..c0eb720 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -197,7 +197,7 @@ static int selinux_xfrm_sec_ctx_alloc(struct xfrm_sec_ctx **ctxp,
struct xfrm_user_sec_ctx *uctx, u32 sid)
{
int rc = 0;
- struct task_security_struct *tsec = current->cred->security;
+ const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = NULL;
char *ctx_str = NULL;
u32 str_len;
@@ -333,7 +333,7 @@ void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
*/
int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
{
- struct task_security_struct *tsec = current->cred->security;
+ const struct task_security_struct *tsec = current_security();
int rc = 0;
if (ctx) {
@@ -378,7 +378,7 @@ void selinux_xfrm_state_free(struct xfrm_state *x)
*/
int selinux_xfrm_state_delete(struct xfrm_state *x)
{
- struct task_security_struct *tsec = current->cred->security;
+ const struct task_security_struct *tsec = current_security();
struct xfrm_sec_ctx *ctx = x->security;
int rc = 0;
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index b6dd4fc..247cec3 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -164,7 +164,7 @@ int smk_curacc(char *obj_label, u32 mode)
{
int rc;
- rc = smk_access(current->cred->security, obj_label, mode);
+ rc = smk_access(current_security(), obj_label, mode);
if (rc == 0)
return 0;
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 7da592f..9d2e227 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -143,7 +143,7 @@ static int smack_ptrace_traceme(struct task_struct *ptp)
static int smack_syslog(int type)
{
int rc;
- char *sp = current->cred->security;
+ char *sp = current_security();
rc = cap_syslog(type);
if (rc != 0)
@@ -375,7 +375,7 @@ static int smack_sb_umount(struct vfsmount *mnt, int flags)
*/
static int smack_inode_alloc_security(struct inode *inode)
{
- inode->i_security = new_inode_smack(current->cred->security);
+ inode->i_security = new_inode_smack(current_security());
if (inode->i_security == NULL)
return -ENOMEM;
return 0;
@@ -820,7 +820,7 @@ static int smack_file_permission(struct file *file, int mask)
*/
static int smack_file_alloc_security(struct file *file)
{
- file->f_security = current->cred->security;
+ file->f_security = current_security();
return 0;
}
@@ -918,7 +918,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
*/
static int smack_file_set_fowner(struct file *file)
{
- file->f_security = current->cred->security;
+ file->f_security = current_security();
return 0;
}
@@ -986,8 +986,7 @@ static int smack_file_receive(struct file *file)
*/
static int smack_cred_alloc_security(struct cred *cred)
{
- cred->security = current->cred->security;
-
+ cred->security = current_security();
return 0;
}
@@ -1225,7 +1224,7 @@ static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
*/
static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
{
- char *csp = current->cred->security;
+ char *csp = current_security();
struct socket_smack *ssp;
ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
@@ -1450,7 +1449,7 @@ static int smack_flags_to_may(int flags)
*/
static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
- msg->security = current->cred->security;
+ msg->security = current_security();
return 0;
}
@@ -1486,7 +1485,7 @@ static int smack_shm_alloc_security(struct shmid_kernel *shp)
{
struct kern_ipc_perm *isp = &shp->shm_perm;
- isp->security = current->cred->security;
+ isp->security = current_security();
return 0;
}
@@ -1595,7 +1594,7 @@ static int smack_sem_alloc_security(struct sem_array *sma)
{
struct kern_ipc_perm *isp = &sma->sem_perm;
- isp->security = current->cred->security;
+ isp->security = current_security();
return 0;
}
@@ -1699,7 +1698,7 @@ static int smack_msg_queue_alloc_security(struct msg_queue *msq)
{
struct kern_ipc_perm *kisp = &msq->q_perm;
- kisp->security = current->cred->security;
+ kisp->security = current_security();
return 0;
}
@@ -1854,7 +1853,7 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
struct super_block *sbp;
struct superblock_smack *sbsp;
struct inode_smack *isp;
- char *csp = current->cred->security;
+ char *csp = current_security();
char *fetched;
char *final;
struct dentry *dp;
@@ -2287,8 +2286,7 @@ static void smack_sock_graft(struct sock *sk, struct socket *parent)
return;
ssp = sk->sk_security;
- ssp->smk_in = current->cred->security;
- ssp->smk_out = current->cred->security;
+ ssp->smk_in = ssp->smk_out = current_security();
ssp->smk_packet[0] = '\0';
rc = smack_netlabel(sk);
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 7f84906..037236e 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -336,7 +336,7 @@ static void smk_cipso_doi(void)
audit_info.loginuid = audit_get_loginuid(current);
audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current->cred->security);
+ audit_info.secid = smack_to_secid(current_security());
rc = netlbl_cfg_map_del(NULL, &audit_info);
if (rc != 0)
@@ -369,7 +369,7 @@ static void smk_unlbl_ambient(char *oldambient)
audit_info.loginuid = audit_get_loginuid(current);
audit_info.sessionid = audit_get_sessionid(current);
- audit_info.secid = smack_to_secid(current->cred->security);
+ audit_info.secid = smack_to_secid(current_security());
if (oldambient != NULL) {
rc = netlbl_cfg_map_del(oldambient, &audit_info);
--
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