^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Manage a process's keyrings
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004-2005, 2008 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/sched/user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/keyctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/user_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/init_task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <keys/request_key_auth-type.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* Session keyring create vs join semaphore */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static DEFINE_MUTEX(key_session_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /* The root user's tracking struct */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct key_user root_key_user = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) .usage = REFCOUNT_INIT(3),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) .cons_lock = __MUTEX_INITIALIZER(root_key_user.cons_lock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) .lock = __SPIN_LOCK_UNLOCKED(root_key_user.lock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) .nkeys = ATOMIC_INIT(2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .nikeys = ATOMIC_INIT(2),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) .uid = GLOBAL_ROOT_UID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Get or create a user register keyring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) static struct key *get_user_register(struct user_namespace *user_ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct key *reg_keyring = READ_ONCE(user_ns->user_keyring_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (reg_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return reg_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) down_write(&user_ns->keyring_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /* Make sure there's a register keyring. It gets owned by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * user_namespace's owner.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) reg_keyring = user_ns->user_keyring_register;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (!reg_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) reg_keyring = keyring_alloc(".user_reg",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) user_ns->owner, INVALID_GID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) &init_cred,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) KEY_POS_WRITE | KEY_POS_SEARCH |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) KEY_USR_VIEW | KEY_USR_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (!IS_ERR(reg_keyring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) smp_store_release(&user_ns->user_keyring_register,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) reg_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) up_write(&user_ns->keyring_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /* We don't return a ref since the keyring is pinned by the user_ns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) return reg_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * Look up the user and user session keyrings for the current process's UID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * creating them if they don't exist.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) int look_up_user_keyrings(struct key **_user_keyring,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct key **_user_session_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) const struct cred *cred = current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct user_namespace *user_ns = current_user_ns();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct key *reg_keyring, *uid_keyring, *session_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) key_perm_t user_keyring_perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) key_ref_t uid_keyring_r, session_keyring_r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) uid_t uid = from_kuid(user_ns, cred->user->uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) char buf[20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) user_keyring_perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) kenter("%u", uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) reg_keyring = get_user_register(user_ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (IS_ERR(reg_keyring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return PTR_ERR(reg_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) down_write(&user_ns->keyring_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* Get the user keyring. Note that there may be one in existence
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * already as it may have been pinned by a session, but the user_struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * pointing to it may have been destroyed by setuid.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) snprintf(buf, sizeof(buf), "_uid.%u", uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) uid_keyring_r = keyring_search(make_key_ref(reg_keyring, true),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) &key_type_keyring, buf, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) kdebug("_uid %p", uid_keyring_r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (uid_keyring_r == ERR_PTR(-EAGAIN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) uid_keyring = keyring_alloc(buf, cred->user->uid, INVALID_GID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) cred, user_keyring_perm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) KEY_ALLOC_UID_KEYRING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) KEY_ALLOC_IN_QUOTA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) NULL, reg_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (IS_ERR(uid_keyring)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ret = PTR_ERR(uid_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) } else if (IS_ERR(uid_keyring_r)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ret = PTR_ERR(uid_keyring_r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) uid_keyring = key_ref_to_ptr(uid_keyring_r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /* Get a default session keyring (which might also exist already) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) snprintf(buf, sizeof(buf), "_uid_ses.%u", uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) session_keyring_r = keyring_search(make_key_ref(reg_keyring, true),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) &key_type_keyring, buf, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) kdebug("_uid_ses %p", session_keyring_r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (session_keyring_r == ERR_PTR(-EAGAIN)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) session_keyring = keyring_alloc(buf, cred->user->uid, INVALID_GID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) cred, user_keyring_perm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) KEY_ALLOC_UID_KEYRING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) KEY_ALLOC_IN_QUOTA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (IS_ERR(session_keyring)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ret = PTR_ERR(session_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) goto error_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* We install a link from the user session keyring to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * the user keyring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ret = key_link(session_keyring, uid_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) goto error_release_session;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /* And only then link the user-session keyring to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ret = key_link(reg_keyring, session_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) goto error_release_session;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) } else if (IS_ERR(session_keyring_r)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) ret = PTR_ERR(session_keyring_r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) goto error_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) session_keyring = key_ref_to_ptr(session_keyring_r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) up_write(&user_ns->keyring_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (_user_session_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) *_user_session_keyring = session_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) key_put(session_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (_user_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) *_user_keyring = uid_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) key_put(uid_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) kleave(" = 0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) error_release_session:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) key_put(session_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) error_release:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) key_put(uid_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) up_write(&user_ns->keyring_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) kleave(" = %d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * Get the user session keyring if it exists, but don't create it if it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * doesn't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct key *get_user_session_keyring_rcu(const struct cred *cred)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct key *reg_keyring = READ_ONCE(cred->user_ns->user_keyring_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) key_ref_t session_keyring_r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) char buf[20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct keyring_search_context ctx = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .index_key.type = &key_type_keyring,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .index_key.description = buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) .cred = cred,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) .match_data.cmp = key_default_cmp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) .match_data.raw_data = buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) .flags = KEYRING_SEARCH_DO_STATE_CHECK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (!reg_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) ctx.index_key.desc_len = snprintf(buf, sizeof(buf), "_uid_ses.%u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) from_kuid(cred->user_ns,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) cred->user->uid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) session_keyring_r = keyring_search_rcu(make_key_ref(reg_keyring, true),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) &ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (IS_ERR(session_keyring_r))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return key_ref_to_ptr(session_keyring_r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * Install a thread keyring to the given credentials struct if it didn't have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * one already. This is allowed to overrun the quota.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * Return: 0 if a thread keyring is now present; -errno on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int install_thread_keyring_to_cred(struct cred *new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct key *keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (new->thread_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) keyring = keyring_alloc("_tid", new->uid, new->gid, new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) KEY_POS_ALL | KEY_USR_VIEW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) KEY_ALLOC_QUOTA_OVERRUN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (IS_ERR(keyring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return PTR_ERR(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) new->thread_keyring = keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * Install a thread keyring to the current task if it didn't have one already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * Return: 0 if a thread keyring is now present; -errno on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) static int install_thread_keyring(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct cred *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) new = prepare_creds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) ret = install_thread_keyring_to_cred(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) abort_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return commit_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * Install a process keyring to the given credentials struct if it didn't have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * one already. This is allowed to overrun the quota.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * Return: 0 if a process keyring is now present; -errno on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) int install_process_keyring_to_cred(struct cred *new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct key *keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (new->process_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) keyring = keyring_alloc("_pid", new->uid, new->gid, new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) KEY_POS_ALL | KEY_USR_VIEW,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) KEY_ALLOC_QUOTA_OVERRUN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) if (IS_ERR(keyring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return PTR_ERR(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) new->process_keyring = keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * Install a process keyring to the current task if it didn't have one already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * Return: 0 if a process keyring is now present; -errno on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static int install_process_keyring(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) struct cred *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) new = prepare_creds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) ret = install_process_keyring_to_cred(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) abort_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return commit_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * Install the given keyring as the session keyring of the given credentials
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * struct, replacing the existing one if any. If the given keyring is NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * then install a new anonymous session keyring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * @cred can not be in use by any task yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * Return: 0 on success; -errno on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) int install_session_keyring_to_cred(struct cred *cred, struct key *keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct key *old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) might_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) /* create an empty session keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (!keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) flags = KEY_ALLOC_QUOTA_OVERRUN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) if (cred->session_keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) flags = KEY_ALLOC_IN_QUOTA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) keyring = keyring_alloc("_ses", cred->uid, cred->gid, cred,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) flags, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (IS_ERR(keyring))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return PTR_ERR(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) __key_get(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) /* install the keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) old = cred->session_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) cred->session_keyring = keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) key_put(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * Install the given keyring as the session keyring of the current task,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * replacing the existing one if any. If the given keyring is NULL, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * install a new anonymous session keyring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * Return: 0 on success; -errno on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) static int install_session_keyring(struct key *keyring)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) struct cred *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) new = prepare_creds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) ret = install_session_keyring_to_cred(new, keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) abort_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) return commit_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * Handle the fsuid changing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) void key_fsuid_changed(struct cred *new_cred)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /* update the ownership of the thread keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (new_cred->thread_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) down_write(&new_cred->thread_keyring->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) new_cred->thread_keyring->uid = new_cred->fsuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) up_write(&new_cred->thread_keyring->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * Handle the fsgid changing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) void key_fsgid_changed(struct cred *new_cred)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /* update the ownership of the thread keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (new_cred->thread_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) down_write(&new_cred->thread_keyring->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) new_cred->thread_keyring->gid = new_cred->fsgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) up_write(&new_cred->thread_keyring->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) * Search the process keyrings attached to the supplied cred for the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) * matching key under RCU conditions (the caller must be holding the RCU read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) * lock).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * The search criteria are the type and the match function. The description is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * given to the match function as a parameter, but doesn't otherwise influence
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * the search. Typically the match function will compare the description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * parameter to the key's description.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * This can only search keyrings that grant Search permission to the supplied
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * credentials. Keyrings linked to searched keyrings will also be searched if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * they grant Search permission too. Keys can only be found if they grant
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * Search permission to the credentials.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * Returns a pointer to the key with the key usage count incremented if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * successful, -EAGAIN if we didn't find any matching key or -ENOKEY if we only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * matched negative keys.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * In the case of a successful return, the possession attribute is set on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * returned key reference.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct key *user_session;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) key_ref_t key_ref, ret, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) const struct cred *cred = ctx->cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /* we want to return -EAGAIN or -ENOKEY if any of the keyrings were
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * searchable, but we failed to find a key or we found a negative key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * otherwise we want to return a sample error (probably -EACCES) if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) * none of the keyrings were searchable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * in terms of priority: success > -ENOKEY > -EAGAIN > other error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) key_ref = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) ret = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) err = ERR_PTR(-EAGAIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) /* search the thread keyring first */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) if (cred->thread_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) key_ref = keyring_search_rcu(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) make_key_ref(cred->thread_keyring, 1), ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (!IS_ERR(key_ref))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) switch (PTR_ERR(key_ref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) case -EAGAIN: /* no key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) case -ENOKEY: /* negative key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) ret = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) err = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) /* search the process keyring second */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (cred->process_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) key_ref = keyring_search_rcu(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) make_key_ref(cred->process_keyring, 1), ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (!IS_ERR(key_ref))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) switch (PTR_ERR(key_ref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) case -EAGAIN: /* no key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) case -ENOKEY: /* negative key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) ret = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) err = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) /* search the session keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (cred->session_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) key_ref = keyring_search_rcu(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) make_key_ref(cred->session_keyring, 1), ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (!IS_ERR(key_ref))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) switch (PTR_ERR(key_ref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) case -EAGAIN: /* no key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) case -ENOKEY: /* negative key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) ret = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) err = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) /* or search the user-session keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) else if ((user_session = get_user_session_keyring_rcu(cred))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) key_ref = keyring_search_rcu(make_key_ref(user_session, 1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) key_put(user_session);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (!IS_ERR(key_ref))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) switch (PTR_ERR(key_ref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) case -EAGAIN: /* no key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) case -ENOKEY: /* negative key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) ret = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) err = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) /* no key - decide on the error we're going to go for */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) key_ref = ret ? ret : err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) return key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) * Search the process keyrings attached to the supplied cred for the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) * matching key in the manner of search_my_process_keyrings(), but also search
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * the keys attached to the assumed authorisation key using its credentials if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) * one is available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) * The caller must be holding the RCU read lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * Return same as search_cred_keyrings_rcu().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) struct request_key_auth *rka;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) key_ref_t key_ref, ret = ERR_PTR(-EACCES), err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) key_ref = search_cred_keyrings_rcu(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (!IS_ERR(key_ref))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) err = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /* if this process has an instantiation authorisation key, then we also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) * search the keyrings of the process mentioned there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) * - we don't permit access to request_key auth keys via this method
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) if (ctx->cred->request_key_auth &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) ctx->cred == current_cred() &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) ctx->index_key.type != &key_type_request_key_auth
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) ) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) const struct cred *cred = ctx->cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (key_validate(cred->request_key_auth) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) rka = ctx->cred->request_key_auth->payload.data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) //// was search_process_keyrings() [ie. recursive]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) ctx->cred = rka->cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) key_ref = search_cred_keyrings_rcu(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) ctx->cred = cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (!IS_ERR(key_ref))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) ret = key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) /* no key - decide on the error we're going to go for */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (err == ERR_PTR(-ENOKEY) || ret == ERR_PTR(-ENOKEY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) key_ref = ERR_PTR(-ENOKEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) else if (err == ERR_PTR(-EACCES))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) key_ref = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) key_ref = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) return key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * See if the key we're looking at is the target key.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) bool lookup_user_key_possessed(const struct key *key,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) const struct key_match_data *match_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) return key == match_data->raw_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) * Look up a key ID given us by userspace with a given permissions mask to get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) * the key it refers to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) * Flags can be passed to request that special keyrings be created if referred
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) * to directly, to permit partially constructed keys to be found and to skip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) * validity and permission checks on the found key.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) * Returns a pointer to the key with an incremented usage count if successful;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) * -EINVAL if the key ID is invalid; -ENOKEY if the key ID does not correspond
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) * to a key or the best found key was a negative key; -EKEYREVOKED or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) * -EKEYEXPIRED if the best found key was revoked or expired; -EACCES if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) * found key doesn't grant the requested permit or the LSM denied access to it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * or -ENOMEM if a special keyring couldn't be created.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * In the case of a successful return, the possession attribute is set on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) * returned key reference.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) enum key_need_perm need_perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) struct keyring_search_context ctx = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) .match_data.cmp = lookup_user_key_possessed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) .flags = (KEYRING_SEARCH_NO_STATE_CHECK |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) KEYRING_SEARCH_RECURSE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) struct request_key_auth *rka;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) struct key *key, *user_session;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) key_ref_t key_ref, skey_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) try_again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) ctx.cred = get_current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) key_ref = ERR_PTR(-ENOKEY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) switch (id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) case KEY_SPEC_THREAD_KEYRING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) if (!ctx.cred->thread_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) if (!(lflags & KEY_LOOKUP_CREATE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) ret = install_thread_keyring();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) key_ref = ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) goto reget_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) key = ctx.cred->thread_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) __key_get(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) key_ref = make_key_ref(key, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) case KEY_SPEC_PROCESS_KEYRING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (!ctx.cred->process_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) if (!(lflags & KEY_LOOKUP_CREATE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) ret = install_process_keyring();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) key_ref = ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) goto reget_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) key = ctx.cred->process_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) __key_get(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) key_ref = make_key_ref(key, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) case KEY_SPEC_SESSION_KEYRING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) if (!ctx.cred->session_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) /* always install a session keyring upon access if one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) * doesn't exist yet */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) ret = look_up_user_keyrings(NULL, &user_session);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) if (lflags & KEY_LOOKUP_CREATE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) ret = join_session_keyring(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) ret = install_session_keyring(user_session);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) key_put(user_session);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) goto reget_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) } else if (test_bit(KEY_FLAG_UID_KEYRING,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) &ctx.cred->session_keyring->flags) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) lflags & KEY_LOOKUP_CREATE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) ret = join_session_keyring(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) goto reget_creds;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) key = ctx.cred->session_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) __key_get(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) key_ref = make_key_ref(key, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) case KEY_SPEC_USER_KEYRING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) ret = look_up_user_keyrings(&key, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) key_ref = make_key_ref(key, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) case KEY_SPEC_USER_SESSION_KEYRING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) ret = look_up_user_keyrings(NULL, &key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) key_ref = make_key_ref(key, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) case KEY_SPEC_GROUP_KEYRING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) /* group keyrings are not yet supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) key_ref = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) case KEY_SPEC_REQKEY_AUTH_KEY:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) key = ctx.cred->request_key_auth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) if (!key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) __key_get(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) key_ref = make_key_ref(key, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) case KEY_SPEC_REQUESTOR_KEYRING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) if (!ctx.cred->request_key_auth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) down_read(&ctx.cred->request_key_auth->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) if (test_bit(KEY_FLAG_REVOKED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) &ctx.cred->request_key_auth->flags)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) key_ref = ERR_PTR(-EKEYREVOKED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) key = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) rka = ctx.cred->request_key_auth->payload.data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) key = rka->dest_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) __key_get(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) up_read(&ctx.cred->request_key_auth->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) if (!key)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) key_ref = make_key_ref(key, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) key_ref = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) if (id < 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) key = key_lookup(id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) if (IS_ERR(key)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) key_ref = ERR_CAST(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) key_ref = make_key_ref(key, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) /* check to see if we possess the key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) ctx.index_key = key->index_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) ctx.match_data.raw_data = key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) kdebug("check possessed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) skey_ref = search_process_keyrings_rcu(&ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) kdebug("possessed=%p", skey_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (!IS_ERR(skey_ref)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) key_put(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) key_ref = skey_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) /* unlink does not use the nominated key in any way, so can skip all
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) * the permission checks as it is only concerned with the keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (need_perm != KEY_NEED_UNLINK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) if (!(lflags & KEY_LOOKUP_PARTIAL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) ret = wait_for_key_construction(key, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) switch (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) goto invalid_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) if (need_perm != KEY_AUTHTOKEN_OVERRIDE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) need_perm != KEY_DEFER_PERM_CHECK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) goto invalid_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) case 0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) } else if (need_perm != KEY_DEFER_PERM_CHECK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) ret = key_validate(key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) goto invalid_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) if (!(lflags & KEY_LOOKUP_PARTIAL) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) key_read_state(key) == KEY_IS_UNINSTANTIATED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) goto invalid_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) /* check the permissions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) ret = key_task_permission(key_ref, ctx.cred, need_perm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) goto invalid_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) key->last_used_at = ktime_get_real_seconds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) put_cred(ctx.cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) return key_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) invalid_key:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) key_ref_put(key_ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) key_ref = ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) /* if we attempted to install a keyring, then it may have caused new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) * creds to be installed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) reget_creds:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) put_cred(ctx.cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) goto try_again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) EXPORT_SYMBOL(lookup_user_key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) * Join the named keyring as the session keyring if possible else attempt to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) * create a new one of that name and join that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) * If the name is NULL, an empty anonymous keyring will be installed as the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) * session keyring.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) * Named session keyrings are joined with a semaphore held to prevent the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) * keyrings from going away whilst the attempt is made to going them and also
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) * to prevent a race in creating compatible session keyrings.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) long join_session_keyring(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) const struct cred *old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) struct cred *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) struct key *keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) long ret, serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) new = prepare_creds();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) old = current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) /* if no name is provided, install an anonymous keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) if (!name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) ret = install_session_keyring_to_cred(new, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) serial = new->session_keyring->serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) ret = commit_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) ret = serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) goto okay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) /* allow the user to join or create a named keyring */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) mutex_lock(&key_session_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) /* look for an existing keyring of this name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) keyring = find_keyring_by_name(name, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (PTR_ERR(keyring) == -ENOKEY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) /* not found - try and create a new one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) keyring = keyring_alloc(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) name, old->uid, old->gid, old,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_LINK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) KEY_ALLOC_IN_QUOTA, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) if (IS_ERR(keyring)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) ret = PTR_ERR(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) goto error2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) } else if (IS_ERR(keyring)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) ret = PTR_ERR(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) goto error2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) } else if (keyring == new->session_keyring) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) goto error3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) /* we've got a keyring - now to install it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) ret = install_session_keyring_to_cred(new, keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) goto error3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) commit_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) mutex_unlock(&key_session_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) ret = keyring->serial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) key_put(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) okay:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) error3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) key_put(keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) error2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) mutex_unlock(&key_session_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) abort_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) * Replace a process's session keyring on behalf of one of its children when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) * the target process is about to resume userspace execution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) void key_change_session_keyring(struct callback_head *twork)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) const struct cred *old = current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) struct cred *new = container_of(twork, struct cred, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) if (unlikely(current->flags & PF_EXITING)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) put_cred(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) new-> uid = old-> uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) new-> euid = old-> euid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) new-> suid = old-> suid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) new->fsuid = old->fsuid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) new-> gid = old-> gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) new-> egid = old-> egid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) new-> sgid = old-> sgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) new->fsgid = old->fsgid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) new->user = get_uid(old->user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) new->user_ns = get_user_ns(old->user_ns);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) new->group_info = get_group_info(old->group_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) new->securebits = old->securebits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) new->cap_inheritable = old->cap_inheritable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) new->cap_permitted = old->cap_permitted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) new->cap_effective = old->cap_effective;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) new->cap_ambient = old->cap_ambient;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) new->cap_bset = old->cap_bset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) new->jit_keyring = old->jit_keyring;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) new->thread_keyring = key_get(old->thread_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) new->process_keyring = key_get(old->process_keyring);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) security_transfer_creds(new, old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) commit_creds(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) * Make sure that root's user and user-session keyrings exist.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) static int __init init_root_keyring(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) return look_up_user_keyrings(NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) late_initcall(init_root_keyring);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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