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authorDavid Howells <dhowells@redhat.com>2006-06-26 00:24:50 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:18 -0700
commit7e047ef5fe2d52e83020e856b1bf2556a6a2ce98 (patch)
tree97656e2c56a27be9d1da451dde627b693b8643f2 /security/keys/process_keys.c
parentf116629d03655adaf7832b93b03c99391d09d4a7 (diff)
[PATCH] keys: sort out key quota system
Add the ability for key creation to overrun the user's quota in some circumstances - notably when a session keyring is created and assigned to a process that didn't previously have one. This means it's still possible to log in, should PAM require the creation of a new session keyring, and fix an overburdened key quota. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security/keys/process_keys.c')
-rw-r--r--security/keys/process_keys.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 4d9825f9962..32150cf7c37 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -77,7 +77,8 @@ int alloc_uid_keyring(struct user_struct *user,
/* concoct a default session keyring */
sprintf(buf, "_uid_ses.%u", user->uid);
- session_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx, 0, NULL);
+ session_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx,
+ KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(session_keyring)) {
ret = PTR_ERR(session_keyring);
goto error;
@@ -87,8 +88,8 @@ int alloc_uid_keyring(struct user_struct *user,
* keyring */
sprintf(buf, "_uid.%u", user->uid);
- uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx, 0,
- session_keyring);
+ uid_keyring = keyring_alloc(buf, user->uid, (gid_t) -1, ctx,
+ KEY_ALLOC_IN_QUOTA, session_keyring);
if (IS_ERR(uid_keyring)) {
key_put(session_keyring);
ret = PTR_ERR(uid_keyring);
@@ -144,7 +145,8 @@ int install_thread_keyring(struct task_struct *tsk)
sprintf(buf, "_tid.%u", tsk->pid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL);
+ keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
+ KEY_ALLOC_QUOTA_OVERRUN, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error;
@@ -178,7 +180,8 @@ int install_process_keyring(struct task_struct *tsk)
if (!tsk->signal->process_keyring) {
sprintf(buf, "_pid.%u", tsk->tgid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL);
+ keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
+ KEY_ALLOC_QUOTA_OVERRUN, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error;
@@ -209,6 +212,7 @@ error:
static int install_session_keyring(struct task_struct *tsk,
struct key *keyring)
{
+ unsigned long flags;
struct key *old;
char buf[20];
@@ -218,7 +222,12 @@ static int install_session_keyring(struct task_struct *tsk,
if (!keyring) {
sprintf(buf, "_ses.%u", tsk->tgid);
- keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk, 1, NULL);
+ flags = KEY_ALLOC_QUOTA_OVERRUN;
+ if (tsk->signal->session_keyring)
+ flags = KEY_ALLOC_IN_QUOTA;
+
+ keyring = keyring_alloc(buf, tsk->uid, tsk->gid, tsk,
+ flags, NULL);
if (IS_ERR(keyring))
return PTR_ERR(keyring);
}
@@ -728,7 +737,8 @@ long join_session_keyring(const char *name)
keyring = find_keyring_by_name(name, 0);
if (PTR_ERR(keyring) == -ENOKEY) {
/* not found - try and create a new one */
- keyring = keyring_alloc(name, tsk->uid, tsk->gid, tsk, 0, NULL);
+ keyring = keyring_alloc(name, tsk->uid, tsk->gid, tsk,
+ KEY_ALLOC_IN_QUOTA, NULL);
if (IS_ERR(keyring)) {
ret = PTR_ERR(keyring);
goto error2;