linux-master/kernel/groups.c

15 struct group_info *groups_alloc(int gidsetsize)
17 	struct group_info *gi;
29 void groups_free(struct group_info *group_info)
31 	kvfree(group_info);
36 /* export the group_info to a user-space array */
38 			  const struct group_info *group_info)
42 	unsigned int count = group_info->ngroups;
46 		gid = from_kgid_munged(user_ns, group_info->gid[i]);
53 /* fill a group_info from a user-space array - it must be allocated already */
54 static int groups_from_user(struct group_info *group_info,
59 	unsigned int count = group_info->ngroups;
71 		group_info->gid[i] = kgid;
84 void groups_sort(struct group_info *group_info)
86 	sort(group_info->gid, group_info->ngroups, sizeof(*group_info->gid),
92 int groups_search(const struct group_info *group_info, kgid_t grp)
96 	if (!group_info)
100 	right = group_info->ngroups;
103 		if (gid_gt(grp, group_info->gid[mid]))
105 		else if (gid_lt(grp, group_info->gid[mid]))
116  * @group_info: The group list to install
118 void set_groups(struct cred *new, struct group_info *group_info)
120 	put_group_info(new->group_info);
121 	get_group_info(group_info);
122 	new->group_info = group_info;
129  * @group_info: The group list to impose
134 int set_current_groups(struct group_info *group_info)
146 	set_groups(new, group_info);
170 	i = cred->group_info->ngroups;
176 		if (groups_to_user(grouplist, cred->group_info)) {
200 	struct group_info *group_info;
208 	group_info = groups_alloc(gidsetsize);
209 	if (!group_info)
211 	retval = groups_from_user(group_info, grouplist);
213 		put_group_info(group_info);
217 	groups_sort(group_info);
218 	retval = set_current_groups(group_info);
219 	put_group_info(group_info);
233 		retval = groups_search(cred->group_info, grp);
245 		retval = groups_search(cred->group_info, grp);