2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * osi_cred.c - Linux cred handling routines.
14 #include <afsconfig.h>
15 #include "afs/param.h"
18 #include "afs/sysincludes.h"
19 #include "afsincludes.h"
21 /* Copy one credential structure to another, being careful about references */
23 afs_copy_creds(cred_t *to_cred, const cred_t *from_cred) {
24 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
25 /* Skip afs_from_kuid/afs_make_kuid round trip */
26 to_cred->fsuid = from_cred->fsuid;
27 to_cred->fsgid = from_cred->fsgid;
28 to_cred->uid = from_cred->uid;
29 to_cred->gid = from_cred->gid;
31 afs_set_cr_uid(to_cred, afs_cr_uid(from_cred));
32 afs_set_cr_gid(to_cred, afs_cr_gid(from_cred));
33 afs_set_cr_ruid(to_cred, afs_cr_ruid(from_cred));
34 afs_set_cr_rgid(to_cred, afs_cr_rgid(from_cred));
36 get_group_info(afs_cr_group_info(from_cred));
37 afs_set_cr_group_info(to_cred, afs_cr_group_info(from_cred));
45 tmp = kmalloc(sizeof(cred_t), GFP_NOFS);
47 osi_Panic("crget: No more memory for creds!\n");
49 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
52 atomic_set(&tmp->cr_ref, 1);
60 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
63 if (atomic_dec_and_test(&cr->cr_ref)) {
64 put_group_info(afs_cr_group_info(cr));
71 /* Return a duplicate of the cred. */
75 cred_t *tmp = crget();
76 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
77 afs_copy_creds(tmp, cr);
79 afs_set_cr_uid(tmp, afs_cr_uid(cr));
80 afs_set_cr_ruid(tmp, afs_cr_ruid(cr));
81 afs_set_cr_gid(tmp, afs_cr_gid(cr));
82 afs_set_cr_rgid(tmp, afs_cr_rgid(cr));
84 get_group_info(afs_cr_group_info(cr));
85 afs_set_cr_group_info(tmp, afs_cr_group_info(cr));
93 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
94 return (cred_t *)get_current_cred();
98 afs_set_cr_uid(cr, current_fsuid());
99 afs_set_cr_ruid(cr, current_uid());
100 afs_set_cr_gid(cr, current_fsgid());
101 afs_set_cr_rgid(cr, current_gid());
104 get_group_info(current_group_info());
105 afs_set_cr_group_info(cr, current_group_info());
106 task_unlock(current);
112 /* Set the cred info into the current task */
116 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
117 struct cred *new_creds;
119 /* If our current task doesn't have identical real and effective
120 * credentials, commit_cred won't let us change them, so we just
123 if (current->cred != current->real_cred)
125 new_creds = prepare_creds();
126 /* Drop the reference to group_info - we'll overwrite it in afs_copy_creds */
127 put_group_info(new_creds->group_info);
128 afs_copy_creds(new_creds, cr);
130 commit_creds(new_creds);
132 struct group_info *old_info;
134 current->fsuid = afs_cr_uid(cr);
135 current->uid = afs_cr_ruid(cr);
136 current->fsgid = afs_cr_gid(cr);
137 current->gid = afs_cr_rgid(cr);
139 get_group_info(afs_cr_group_info(cr));
141 old_info = current->group_info;
142 current->group_info = afs_cr_group_info(cr);
143 task_unlock(current);
144 put_group_info(old_info);