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CRED: Wrap current->cred and a few other accessors

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Wrap current->cred and a few other accessors to hide their actual
implementation.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells
2008-11-14 10:39:18 +11:00
committed by James Morris
parent f1752eec61
commit 86a264abe5
27 changed files with 271 additions and 162 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel/sys.c
+29 -30
View File
@@ -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_thread(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_thread(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;
@@ -1199,7 +1201,7 @@ 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;
@@ -1268,13 +1270,8 @@ 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;
@@ -1330,8 +1327,9 @@ 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;
@@ -1341,8 +1339,9 @@ 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;