diff options
Diffstat (limited to 'kernel/user.c')
-rw-r--r-- | kernel/user.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/user.c b/kernel/user.c index 6408c0424291..220e586127a0 100644 --- a/kernel/user.c +++ b/kernel/user.c | |||
@@ -187,6 +187,17 @@ void switch_uid(struct user_struct *new_user) | |||
187 | atomic_dec(&old_user->processes); | 187 | atomic_dec(&old_user->processes); |
188 | switch_uid_keyring(new_user); | 188 | switch_uid_keyring(new_user); |
189 | current->user = new_user; | 189 | current->user = new_user; |
190 | |||
191 | /* | ||
192 | * We need to synchronize with __sigqueue_alloc() | ||
193 | * doing a get_uid(p->user).. If that saw the old | ||
194 | * user value, we need to wait until it has exited | ||
195 | * its critical region before we can free the old | ||
196 | * structure. | ||
197 | */ | ||
198 | smp_mb(); | ||
199 | spin_unlock_wait(¤t->sighand->siglock); | ||
200 | |||
190 | free_uid(old_user); | 201 | free_uid(old_user); |
191 | suid_keys(current); | 202 | suid_keys(current); |
192 | } | 203 | } |