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authorDavid Howells <dhowells@redhat.com>2008-11-14 10:39:16 +1100
committerJames Morris <jmorris@namei.org>2008-11-14 10:39:16 +1100
commitb6dff3ec5e116e3af6f537d4caedcad6b9e5082a (patch)
tree9e76f972eb7ce9b84e0146c8e4126a3f86acb428 /security/keys/process_keys.c
parent15a2460ed0af7538ca8e6c610fe607a2cd9da142 (diff)
CRED: Separate task security context from task_struct
Separate the task security context from task_struct. At this point, the security data is temporarily embedded in the task_struct with two pointers pointing to it. Note that the Alpha arch is altered as it refers to (E)UID and (E)GID in entry.S via asm-offsets. With comment fixes Signed-off-by: Marc Dionne <marc.c.dionne@gmail.com> 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>
Diffstat (limited to 'security/keys/process_keys.c')
-rw-r--r--security/keys/process_keys.c98
1 files changed, 51 insertions, 47 deletions
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 1c793b7090a..b0904cdda2e 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -42,7 +42,7 @@ struct key_user root_key_user = {
*/
int install_user_keyrings(void)
{
- struct user_struct *user = current->user;
+ struct user_struct *user = current->cred->user;
struct key *uid_keyring, *session_keyring;
char buf[20];
int ret;
@@ -156,7 +156,7 @@ int install_thread_keyring(void)
sprintf(buf, "_tid.%u", tsk->pid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
+ keyring = keyring_alloc(buf, tsk->cred->uid, tsk->cred->gid, tsk,
KEY_ALLOC_QUOTA_OVERRUN, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
@@ -164,8 +164,8 @@ int install_thread_keyring(void)
}
task_lock(tsk);
- old = tsk->thread_keyring;
- tsk->thread_keyring = keyring;
+ old = tsk->cred->thread_keyring;
+ tsk->cred->thread_keyring = keyring;
task_unlock(tsk);
ret = 0;
@@ -192,7 +192,7 @@ int install_process_keyring(void)
if (!tsk->signal->process_keyring) {
sprintf(buf, "_pid.%u", tsk->tgid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
+ keyring = keyring_alloc(buf, tsk->cred->uid, tsk->cred->gid, tsk,
KEY_ALLOC_QUOTA_OVERRUN, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
@@ -238,7 +238,7 @@ static int install_session_keyring(struct key *keyring)
if (tsk->signal->session_keyring)
flags = KEY_ALLOC_IN_QUOTA;
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
+ keyring = keyring_alloc(buf, tsk->cred->uid, tsk->cred->gid, tsk,
flags, NULL);
if (IS_ERR(keyring))
return PTR_ERR(keyring);
@@ -292,14 +292,14 @@ int copy_thread_group_keys(struct task_struct *tsk)
*/
int copy_keys(unsigned long clone_flags, struct task_struct *tsk)
{
- key_check(tsk->thread_keyring);
- key_check(tsk->request_key_auth);
+ key_check(tsk->cred->thread_keyring);
+ key_check(tsk->cred->request_key_auth);
/* no thread keyring yet */
- tsk->thread_keyring = NULL;
+ tsk->cred->thread_keyring = NULL;
/* copy the request_key() authorisation for this thread */
- key_get(tsk->request_key_auth);
+ key_get(tsk->cred->request_key_auth);
return 0;
@@ -322,8 +322,8 @@ void exit_thread_group_keys(struct signal_struct *tg)
*/
void exit_keys(struct task_struct *tsk)
{
- key_put(tsk->thread_keyring);
- key_put(tsk->request_key_auth);
+ key_put(tsk->cred->thread_keyring);
+ key_put(tsk->cred->request_key_auth);
} /* end exit_keys() */
@@ -337,8 +337,8 @@ int exec_keys(struct task_struct *tsk)
/* newly exec'd tasks don't get a thread keyring */
task_lock(tsk);
- old = tsk->thread_keyring;
- tsk->thread_keyring = NULL;
+ old = tsk->cred->thread_keyring;
+ tsk->cred->thread_keyring = NULL;
task_unlock(tsk);
key_put(old);
@@ -373,10 +373,11 @@ int suid_keys(struct task_struct *tsk)
void key_fsuid_changed(struct task_struct *tsk)
{
/* update the ownership of the thread keyring */
- if (tsk->thread_keyring) {
- down_write(&tsk->thread_keyring->sem);
- tsk->thread_keyring->uid = tsk->fsuid;
- up_write(&tsk->thread_keyring->sem);
+ BUG_ON(!tsk->cred);
+ if (tsk->cred->thread_keyring) {
+ down_write(&tsk->cred->thread_keyring->sem);
+ tsk->cred->thread_keyring->uid = tsk->cred->fsuid;
+ up_write(&tsk->cred->thread_keyring->sem);
}
} /* end key_fsuid_changed() */
@@ -388,10 +389,11 @@ void key_fsuid_changed(struct task_struct *tsk)
void key_fsgid_changed(struct task_struct *tsk)
{
/* update the ownership of the thread keyring */
- if (tsk->thread_keyring) {
- down_write(&tsk->thread_keyring->sem);
- tsk->thread_keyring->gid = tsk->fsgid;
- up_write(&tsk->thread_keyring->sem);
+ BUG_ON(!tsk->cred);
+ if (tsk->cred->thread_keyring) {
+ down_write(&tsk->cred->thread_keyring->sem);
+ tsk->cred->thread_keyring->gid = tsk->cred->fsgid;
+ up_write(&tsk->cred->thread_keyring->sem);
}
} /* end key_fsgid_changed() */
@@ -426,9 +428,9 @@ key_ref_t search_process_keyrings(struct key_type *type,
err = ERR_PTR(-EAGAIN);
/* search the thread keyring first */
- if (context->thread_keyring) {
+ if (context->cred->thread_keyring) {
key_ref = keyring_search_aux(
- make_key_ref(context->thread_keyring, 1),
+ make_key_ref(context->cred->thread_keyring, 1),
context, type, description, match);
if (!IS_ERR(key_ref))
goto found;
@@ -493,9 +495,9 @@ key_ref_t search_process_keyrings(struct key_type *type,
}
}
/* or search the user-session keyring */
- else if (context->user->session_keyring) {
+ else if (context->cred->user->session_keyring) {
key_ref = keyring_search_aux(
- make_key_ref(context->user->session_keyring, 1),
+ make_key_ref(context->cred->user->session_keyring, 1),
context, type, description, match);
if (!IS_ERR(key_ref))
goto found;
@@ -517,20 +519,20 @@ key_ref_t search_process_keyrings(struct key_type *type,
* search the keyrings of the process mentioned there
* - we don't permit access to request_key auth keys via this method
*/
- if (context->request_key_auth &&
+ if (context->cred->request_key_auth &&
context == current &&
type != &key_type_request_key_auth
) {
/* defend against the auth key being revoked */
- down_read(&context->request_key_auth->sem);
+ down_read(&context->cred->request_key_auth->sem);
- if (key_validate(context->request_key_auth) == 0) {
- rka = context->request_key_auth->payload.data;
+ if (key_validate(context->cred->request_key_auth) == 0) {
+ rka = context->cred->request_key_auth->payload.data;
key_ref = search_process_keyrings(type, description,
match, rka->context);
- up_read(&context->request_key_auth->sem);
+ up_read(&context->cred->request_key_auth->sem);
if (!IS_ERR(key_ref))
goto found;
@@ -547,7 +549,7 @@ key_ref_t search_process_keyrings(struct key_type *type,
break;
}
} else {
- up_read(&context->request_key_auth->sem);
+ up_read(&context->cred->request_key_auth->sem);
}
}
@@ -580,15 +582,16 @@ key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
{
struct request_key_auth *rka;
struct task_struct *t = current;
- key_ref_t key_ref, skey_ref;
+ struct cred *cred = t->cred;
struct key *key;
+ key_ref_t key_ref, skey_ref;
int ret;
key_ref = ERR_PTR(-ENOKEY);
switch (id) {
case KEY_SPEC_THREAD_KEYRING:
- if (!t->thread_keyring) {
+ if (!cred->thread_keyring) {
if (!create)
goto error;
@@ -599,7 +602,7 @@ key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
}
}
- key = t->thread_keyring;
+ key = cred->thread_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
@@ -628,7 +631,8 @@ key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
ret = install_user_keyrings();
if (ret < 0)
goto error;
- ret = install_session_keyring(t->user->session_keyring);
+ ret = install_session_keyring(
+ cred->user->session_keyring);
if (ret < 0)
goto error;
}
@@ -641,25 +645,25 @@ key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
break;
case KEY_SPEC_USER_KEYRING:
- if (!t->user->uid_keyring) {
+ if (!cred->user->uid_keyring) {
ret = install_user_keyrings();
if (ret < 0)
goto error;
}
- key = t->user->uid_keyring;
+ key = cred->user->uid_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
case KEY_SPEC_USER_SESSION_KEYRING:
- if (!t->user->session_keyring) {
+ if (!cred->user->session_keyring) {
ret = install_user_keyrings();
if (ret < 0)
goto error;
}
- key = t->user->session_keyring;
+ key = cred->user->session_keyring;
atomic_inc(&key->usage);
key_ref = make_key_ref(key, 1);
break;
@@ -670,7 +674,7 @@ key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
goto error;
case KEY_SPEC_REQKEY_AUTH_KEY:
- key = t->request_key_auth;
+ key = cred->request_key_auth;
if (!key)
goto error;
@@ -679,19 +683,19 @@ key_ref_t lookup_user_key(key_serial_t id, int create, int partial,
break;
case KEY_SPEC_REQUESTOR_KEYRING:
- if (!t->request_key_auth)
+ if (!cred->request_key_auth)
goto error;
- down_read(&t->request_key_auth->sem);
- if (t->request_key_auth->flags & KEY_FLAG_REVOKED) {
+ down_read(&cred->request_key_auth->sem);
+ if (cred->request_key_auth->flags & KEY_FLAG_REVOKED) {
key_ref = ERR_PTR(-EKEYREVOKED);
key = NULL;
} else {
- rka = t->request_key_auth->payload.data;
+ rka = cred->request_key_auth->payload.data;
key = rka->dest_keyring;
atomic_inc(&key->usage);
}
- up_read(&t->request_key_auth->sem);
+ up_read(&cred->request_key_auth->sem);
if (!key)
goto error;
key_ref = make_key_ref(key, 1);
@@ -791,7 +795,7 @@ long join_session_keyring(const char *name)
keyring = find_keyring_by_name(name, false);
if (PTR_ERR(keyring) == -ENOKEY) {
/* not found - try and create a new one */
- keyring = keyring_alloc(name, tsk->uid, tsk->gid, tsk,
+ keyring = keyring_alloc(name, tsk->cred->uid, tsk->cred->gid, tsk,
KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);