diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cgroup.c | 2 | ||||
| -rw-r--r-- | kernel/compat.c | 3 | ||||
| -rw-r--r-- | kernel/cpu.c | 4 | ||||
| -rw-r--r-- | kernel/exit.c | 66 | ||||
| -rw-r--r-- | kernel/fork.c | 2 | ||||
| -rw-r--r-- | kernel/futex.c | 17 | ||||
| -rw-r--r-- | kernel/hrtimer.c | 177 | ||||
| -rw-r--r-- | kernel/kthread.c | 2 | ||||
| -rw-r--r-- | kernel/marker.c | 2 | ||||
| -rw-r--r-- | kernel/pid.c | 41 | ||||
| -rw-r--r-- | kernel/pid_namespace.c | 2 | ||||
| -rw-r--r-- | kernel/posix-timers.c | 6 | ||||
| -rw-r--r-- | kernel/printk.c | 96 | ||||
| -rw-r--r-- | kernel/ptrace.c | 13 | ||||
| -rw-r--r-- | kernel/signal.c | 646 | ||||
| -rw-r--r-- | kernel/sys.c | 79 | ||||
| -rw-r--r-- | kernel/taskstats.c | 6 | ||||
| -rw-r--r-- | kernel/timer.c | 153 | ||||
| -rw-r--r-- | kernel/user.c | 18 | ||||
| -rw-r--r-- | kernel/workqueue.c | 2 |
20 files changed, 786 insertions, 551 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index b9d467d83fc..fbc6fc8949b 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -575,7 +575,7 @@ static struct inode_operations cgroup_dir_inode_operations; static struct file_operations proc_cgroupstats_operations; static struct backing_dev_info cgroup_backing_dev_info = { - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb) diff --git a/kernel/compat.c b/kernel/compat.c index e1ef04870c2..4a856a3643b 100644 --- a/kernel/compat.c +++ b/kernel/compat.c @@ -898,7 +898,7 @@ asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat current->state = TASK_INTERRUPTIBLE; schedule(); - set_thread_flag(TIF_RESTORE_SIGMASK); + set_restore_sigmask(); return -ERESTARTNOHAND; } #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ @@ -1080,4 +1080,3 @@ compat_sys_sysinfo(struct compat_sysinfo __user *info) return 0; } - diff --git a/kernel/cpu.c b/kernel/cpu.c index a98f6ab16ec..c77bc3a1c72 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -215,7 +215,7 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) __raw_notifier_call_chain(&cpu_chain, CPU_DOWN_FAILED | mod, hcpu, nr_calls, NULL); printk("%s: attempt to take down CPU %u failed\n", - __FUNCTION__, cpu); + __func__, cpu); err = -EINVAL; goto out_release; } @@ -295,7 +295,7 @@ static int __cpuinit _cpu_up(unsigned int cpu, int tasks_frozen) if (ret == NOTIFY_BAD) { nr_calls--; printk("%s: attempt to bring up CPU %u failed\n", - __FUNCTION__, cpu); + __func__, cpu); ret = -EINVAL; goto out_notify; } diff --git a/kernel/exit.c b/kernel/exit.c index ae0f2c4e452..d3ad54677f9 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -52,6 +52,11 @@ static void exit_mm(struct task_struct * tsk); +static inline int task_detached(struct task_struct *p) +{ + return p->exit_signal == -1; +} + static void __unhash_process(struct task_struct *p) { nr_threads--; @@ -160,7 +165,7 @@ repeat: zap_leader = 0; leader = p->group_leader; if (leader != p && thread_group_empty(leader) && leader->exit_state == EXIT_ZOMBIE) { - BUG_ON(leader->exit_signal == -1); + BUG_ON(task_detached(leader)); do_notify_parent(leader, leader->exit_signal); /* * If we were the last child thread and the leader has @@ -170,7 +175,7 @@ repeat: * do_notify_parent() will have marked it self-reaping in * that case. */ - zap_leader = (leader->exit_signal == -1); + zap_leader = task_detached(leader); } write_unlock_irq(&tasklist_lock); @@ -329,13 +334,11 @@ void __set_special_pids(struct pid *pid) pid_t nr = pid_nr(pid); if (task_session(curr) != pid) { - detach_pid(curr, PIDTYPE_SID); - attach_pid(curr, PIDTYPE_SID, pid); + change_pid(curr, PIDTYPE_SID, pid); set_task_session(curr, nr); } if (task_pgrp(curr) != pid) { - detach_pid(curr, PIDTYPE_PGID); - attach_pid(curr, PIDTYPE_PGID, pid); + change_pid(curr, PIDTYPE_PGID, pid); set_task_pgrp(curr, nr); } } @@ -693,7 +696,7 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced) if (unlikely(traced)) { /* Preserve ptrace links if someone else is tracing this child. */ list_del_init(&p->ptrace_list); - if (p->parent != p->real_parent) + if (ptrace_reparented(p)) list_add(&p->ptrace_list, &p->real_parent->ptrace_children); } else { /* If this child is being traced, then we're the one tracing it @@ -717,18 +720,18 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced) /* If this is a threaded reparent there is no need to * notify anyone anything has happened. */ - if (p->real_parent->group_leader == father->group_leader) + if (same_thread_group(p->real_parent, father)) return; /* We don't want people slaying init. */ - if (p->exit_signal != -1) + if (!task_detached(p)) p->exit_signal = SIGCHLD; /* If we'd notified the old parent about this child's death, * also notify the new parent. */ if (!traced && p->exit_state == EXIT_ZOMBIE && - p->exit_signal != -1 && thread_group_empty(p)) + !task_detached(p) && thread_group_empty(p)) do_notify_parent(p, p->exit_signal); kill_orphaned_pgrp(p, father); @@ -781,18 +784,18 @@ static void forget_original_parent(struct task_struct *father) } else { /* reparent ptraced task to its real parent */ __ptrace_unlink (p); - if (p->exit_state == EXIT_ZOMBIE && p->exit_signal != -1 && + if (p->exit_state == EXIT_ZOMBIE && !task_detached(p) && thread_group_empty(p)) do_notify_parent(p, p->exit_signal); } /* - * if the ptraced child is a zombie with exit_signal == -1 - * we must collect it before we exit, or it will remain - * zombie forever since we prevented it from self-reap itself - * while it was being traced by us, to be able to see it in wait4. + * if the ptraced child is a detached zombie we must collect + * it before we exit, or it will remain zombie forever since + * we prevented it from self-reap itself while it was being + * traced by us, to be able to see it in wait4. */ - if (unlikely(ptrace && p->exit_state == EXIT_ZOMBIE && p->exit_signal == -1)) + if (unlikely(ptrace && p->exit_state == EXIT_ZOMBIE && task_detached(p))) list_add(&p->ptrace_list, &ptrace_dead); } @@ -849,29 +852,30 @@ static void exit_notify(struct task_struct *tsk, int group_dead) * we have changed execution domain as these two values started * the same after a fork. */ - if (tsk->exit_signal != SIGCHLD && tsk->exit_signal != -1 && + if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) && (tsk->parent_exec_id != tsk->real_parent->self_exec_id || - tsk->self_exec_id != tsk->parent_exec_id) - && !capable(CAP_KILL)) + tsk->self_exec_id != tsk->parent_exec_id) && + !capable(CAP_KILL)) tsk->exit_signal = SIGCHLD; - /* If something other than our normal parent is ptracing us, then * send it a SIGCHLD instead of honoring exit_signal. exit_signal * only has special meaning to our real parent. */ - if (tsk->exit_signal != -1 && thread_group_empty(tsk)) { - int signal = tsk->parent == tsk->real_parent ? tsk->exit_signal : SIGCHLD; + if (!task_detached(tsk) && thread_group_empty(tsk)) { + int signal = ptrace_reparented(tsk) ? + SIGCHLD : tsk->exit_signal; do_notify_parent(tsk, signal); } else if (tsk->ptrace) { do_notify_parent(tsk, SIGCHLD); } state = EXIT_ZOMBIE; - if (tsk->exit_signal == -1 && likely(!tsk->ptrace)) + if (task_detached(tsk) && likely(!tsk->ptrace)) state = EXIT_DEAD; tsk->exit_state = state; + /* mt-exec, de_thread() is waiting for us */ if (thread_group_leader(tsk) && tsk->signal->notify_count < 0 && tsk->signal->group_exit_task) @@ -1115,12 +1119,13 @@ asmlinkage long sys_exit(int error_code) NORET_TYPE void do_group_exit(int exit_code) { + struct signal_struct *sig = current->signal; + BUG_ON(exit_code & 0x80); /* core dumps don't get here */ - if (current->signal->flags & SIGNAL_GROUP_EXIT) - exit_code = current->signal->group_exit_code; + if (signal_group_exit(sig)) + exit_code = sig->group_exit_code; else if (!thread_group_empty(current)) { - struct signal_struct *const sig = current->signal; struct sighand_struct *const sighand = current->sighand; spin_lock_irq(&sighand->siglock); if (signal_group_exit(sig)) @@ -1172,7 +1177,7 @@ static int eligible_child(enum pid_type type, struct pid *pid, int options, * Do not consider detached threads that are * not ptraced: */ - if (p->exit_signal == -1 && !p->ptrace) + if (task_detached(p) && !p->ptrace) return 0; /* Wait for all children (clone and not) if __WALL is set; @@ -1262,8 +1267,7 @@ static int wait_task_zombie(struct task_struct *p, int noreap, return 0; } - /* traced means p->ptrace, but not vice versa */ - traced = (p->real_parent != p->parent); + traced = ptrace_reparented(p); if (likely(!traced)) { struct signal_struct *psig; @@ -1364,9 +1368,9 @@ static int wait_task_zombie(struct task_struct *p, int noreap, * If it's still not detached after that, don't release * it now. */ - if (p->exit_signal != -1) { + if (!task_detached(p)) { do_notify_parent(p, p->exit_signal); - if (p->exit_signal != -1) { + if (!task_detached(p)) { p->exit_state = EXIT_ZOMBIE; p = NULL; } diff --git a/kernel/fork.c b/kernel/fork.c index 068ffe00752..2bb675af4de 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -892,7 +892,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) sig->group_exit_code = 0; sig->group_exit_task = NULL; sig->group_stop_count = 0; - sig->curr_target = NULL; + sig->curr_target = tsk; init_sigpending(&sig->shared_pending); INIT_LIST_HEAD(&sig->posix_timers); diff --git a/kernel/futex.c b/kernel/futex.c index e43945e995f..98092c9817f 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -1266,11 +1266,13 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared, if (!abs_time) schedule(); else { - hrtimer_init(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, + HRTIMER_MODE_ABS); hrtimer_init_sleeper(&t, current); t.timer.expires = *abs_time; - hrtimer_start(&t.timer, t.timer.expires, HRTIMER_MODE_ABS); + hrtimer_start(&t.timer, t.timer.expires, + HRTIMER_MODE_ABS); if (!hrtimer_active(&t.timer)) t.task = NULL; @@ -1286,6 +1288,8 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared, /* Flag if a timeout occured */ rem = (t.task == NULL); + + destroy_hrtimer_on_stack(&t.timer); } } __set_current_state(TASK_RUNNING); @@ -1367,7 +1371,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared, if (time) { to = &timeout; - hrtimer_init(&to->timer, CLOCK_REALTIME, HRTIMER_MODE_ABS); + hrtimer_init_on_stack(&to->timer, CLOCK_REALTIME, + HRTIMER_MODE_ABS); hrtimer_init_sleeper(to, current); to->timer.expires = *time; } @@ -1581,6 +1586,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared, unqueue_me_pi(&q); futex_unlock_mm(fshared); + if (to) + destroy_hrtimer_on_stack(&to->timer); return ret != -EINTR ? ret : -ERESTARTNOINTR; out_unlock_release_sem: @@ -1588,6 +1595,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared, out_release_sem: futex_unlock_mm(fshared); + if (to) + destroy_hrtimer_on_stack(&to->timer); return ret; uaddr_faulted: @@ -1615,6 +1624,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared, if (!ret && (uval != -EFAULT)) goto retry; + if (to) + destroy_hrtimer_on_stack(&to->timer); return ret; } diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c index dea4c9124ac..9af1d6a8095 100644 --- a/kernel/hrtimer.c +++ b/kernel/hrtimer.c @@ -43,6 +43,7 @@ #include <linux/tick.h> #include <linux/seq_file.h> #include <linux/err.h> +#include <linux/debugobjects.h> #include <asm/uaccess.h> @@ -342,6 +343,115 @@ ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs) return res; } +#ifdef CONFIG_DEBUG_OBJECTS_TIMERS + +static struct debug_obj_descr hrtimer_debug_descr; + +/* + * fixup_init is called when: + * - an active object is initialized + */ +static int hrtimer_fixup_init(void *addr, enum debug_obj_state state) +{ + struct hrtimer *timer = addr; + + switch (state) { + case ODEBUG_STATE_ACTIVE: + hrtimer_cancel(timer); + debug_object_init(timer, &hrtimer_debug_descr); + return 1; + default: + return 0; + } +} + +/* + * fixup_activate is called when: + * - an active object is activated + * - an unknown object is activated (might be a statically initialized object) + */ +static int hrtimer_fixup_activate(void *addr, enum debug_obj_state state) +{ + switch (state) { + + case ODEBUG_STATE_NOTAVAILABLE: + WARN_ON_ONCE(1); + return 0; + + case ODEBUG_STATE_ACTIVE: + WARN_ON(1); + + default: + return 0; + } +} + +/* + * fixup_free is called when: + * - an active object is freed + */ +static int hrtimer_fixup_free(void *addr, enum debug_obj_state state) +{ + struct hrtimer *timer = addr; + + switch (state) { + case ODEBUG_STATE_ACTIVE: + hrtimer_cancel(timer); + debug_object_free(timer, &hrtimer_debug_descr); + return 1; + default: + return 0; + } +} + +static struct debug_obj_descr hrtimer_debug_descr = { + .name = "hrtimer", + .fixup_init = hrtimer_fixup_init, + .fixup_activate = hrtimer_fixup_activate, + .fixup_free = hrtimer_fixup_free, +}; + +static inline void debug_hrtimer_init(struct hrtimer *timer) +{ + debug_object_init(timer, &hrtimer_debug_descr); +} + +static inline void debug_hrtimer_activate(struct hrtimer *timer) +{ + debug_object_activate(timer, &hrtimer_debug_descr); +} + +static inline void debug_hrtimer_deactivate(struct hrtimer *timer) +{ + debug_object_deactivate(timer, &hrtimer_debug_descr); +} + +static inline void debug_hrtimer_free(struct hrtimer *timer) +{ + debug_object_free(timer, &hrtimer_debug_descr); +} + +static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, + enum hrtimer_mode mode); + +void hrtimer_init_on_stack(struct hrtimer *timer, clockid_t clock_id, + enum hrtimer_mode mode) +{ + debug_object_init_on_stack(timer, &hrtimer_debug_descr); + __hrtimer_init(timer, clock_id, mode); +} + +void destroy_hrtimer_on_stack(struct hrtimer *timer) +{ + debug_object_free(timer, &hrtimer_debug_descr); +} + +#else +static inline void debug_hrtimer_init(struct hrtimer *timer) { } +static inline void debug_hrtimer_activate(struct hrtimer *timer) { } +static inline void debug_hrtimer_deactivate(struct hrtimer *timer) { } +#endif + /* * Check, whether the timer is on the callback pending list */ @@ -567,6 +677,7 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, /* Timer is expired, act upon the callback mode */ switch(timer->cb_mode) { case HRTIMER_CB_IRQSAFE_NO_RESTART: + debug_hrtimer_deactivate(timer); /* * We can call the callback from here. No restart * happens, so no danger of recursion @@ -581,6 +692,7 @@ static inline int hrtimer_enqueue_reprogram(struct hrtimer *timer, * the tick timer in the softirq ! The calling site * takes care of this. */ + debug_hrtimer_deactivate(timer); return 1; case HRTIMER_CB_IRQSAFE: case HRTIMER_CB_SOFTIRQ: @@ -735,6 +847,8 @@ static void enqueue_hrtimer(struct hrtimer *timer, struct hrtimer *entry; int leftmost = 1; + debug_hrtimer_activate(timer); + /* * Find the right place in the rbtree: */ @@ -831,6 +945,7 @@ remove_hrtimer(struct hrtimer *timer, struct hrtimer_clock_base *base) * reprogramming happens in the interrupt handler. This is a * rare case and less expensive than a smp call. */ + debug_hrtimer_deactivate(timer); timer_stats_hrtimer_clear_start_info(timer); reprogram = base->cpu_base == &__get_cpu_var(hrtimer_bases); __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, @@ -878,6 +993,7 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode) tim = ktime_add_safe(tim, base->resolution); #endif } + timer->expires = tim; timer_stats_hrtimer_set_start_info(timer); @@ -1011,14 +1127,8 @@ ktime_t hrtimer_get_next_event(void) } #endif -/** - * hrtimer_init - initialize a timer to the given clock - * @timer: the timer to be initialized - * @clock_id: the clock to be used - * @mode: timer mode abs/rel - */ -void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, - enum hrtimer_mode mode) +static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, + enum hrtimer_mode mode) { struct hrtimer_cpu_base *cpu_base; @@ -1039,6 +1149,19 @@ void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, memset(timer->start_comm, 0, TASK_COMM_LEN); #endif } + +/** + * hrtimer_init - initialize a timer to the given clock + * @timer: the timer to be initialized + * @clock_id: the clock to be used + * @mode: timer mode abs/rel + */ +void hrtimer_init(struct hrtimer *timer, clockid_t clock_id, + enum hrtimer_mode mode) +{ + debug_hrtimer_init(timer); + __hrtimer_init(timer, clock_id, mode); +} EXPORT_SYMBOL_GPL(hrtimer_init); /** @@ -1072,6 +1195,7 @@ static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base) timer = list_entry(cpu_base->cb_pending.next, struct hrtimer, cb_entry); + debug_hrtimer_deactivate(timer); timer_stats_account_hrtimer(timer); fn = timer->function; @@ -1120,6 +1244,7 @@ static void __run_hrtimer(struct hrtimer *timer) enum hrtimer_restart (*fn)(struct hrtimer *); int restart; + debug_hrtimer_deactivate(timer); __remove_hrtimer(timer, base, HRTIMER_STATE_CALLBACK, 0); timer_stats_account_hrtimer(timer); @@ -1378,22 +1503,27 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart) { struct hrtimer_sleeper t; struct timespec __user *rmtp; + int ret = 0; - hrtimer_init(&t.timer, restart->nanosleep.index, HRTIMER_MODE_ABS); + hrtimer_init_on_stack(&t.timer, restart->nanosleep.index, + HRTIMER_MODE_ABS); t.timer.expires.tv64 = restart->nanosleep.expires; if (do_nanosleep(&t, HRTIMER_MODE_ABS)) - return 0; + goto out; rmtp = restart->nanosleep.rmtp; if (rmtp) { - int ret = update_rmtp(&t.timer, rmtp); + ret = update_rmtp(&t.timer, rmtp); if (ret <= 0) - return ret; + goto out; } /* The other values in restart are already filled in */ - return -ERESTART_RESTARTBLOCK; + ret = -ERESTART_RESTARTBLOCK; +out: + destroy_hrtimer_on_stack(&t.timer); + return ret; } long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, @@ -1401,20 +1531,23 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, { struct restart_block *restart; struct hrtimer_sleeper t; + int ret = 0; - hrtimer_init(&t.timer, clockid, mode); + hrtimer_init_on_stack(&t.timer, clockid, mode); t.timer.expires = timespec_to_ktime(*rqtp); if (do_nanosleep(&t, mode)) - return 0; + goto out; /* Absolute timers do not update the rmtp value and restart: */ - if (mode == HRTIMER_MODE_ABS) - return -ERESTARTNOHAND; + if (mode == HRTIMER_MODE_ABS) { + ret = -ERESTARTNOHAND; + goto out; + } if (rmtp) { - int ret = update_rmtp(&t.timer, rmtp); + ret = update_rmtp(&t.timer, rmtp); if (ret <= 0) - return ret; + goto out; } restart = ¤t_thread_info()->restart_block; @@ -1423,7 +1556,10 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp, restart->nanosleep.rmtp = rmtp; restart->nanosleep.expires = t.timer.expires.tv64; - return -ERESTART_RESTARTBLOCK; + ret = -ERESTART_RESTARTBLOCK; +out: + destroy_hrtimer_on_stack(&t.timer); + return ret; } asmlinkage long @@ -1468,6 +1604,7 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, while ((node = rb_first(&old_base->active))) { timer = rb_entry(node, struct hrtimer, node); BUG_ON(hrtimer_callback_running(timer)); + debug_hrtimer_deactivate(timer); __remove_hrtimer(timer, old_base, HRTIMER_STATE_INACTIVE, 0); timer->base = new_base; /* diff --git a/kernel/kthread.c b/kernel/kthread.c index ac72eea4833..bd1b9ea024e 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -98,7 +98,7 @@ static void create_kthread(struct kthread_create_info *create) struct sched_param param = { .sched_priority = 0 }; wait_for_completion(&create->started); read_lock(&tasklist_lock); - create->result = find_task_by_pid(pid); + create->result = find_task_by_pid_ns(pid, &init_pid_ns); read_unlock(&tasklist_lock); /* * root may have changed our (kthreadd's) priority or CPU mask. diff --git a/kernel/marker.c b/kernel/marker.c index 139260e5460..b5a9fe1d50d 100644 --- a/kernel/marker.c +++ b/kernel/marker.c @@ -29,7 +29,7 @@ extern struct marker __start___markers[]; extern struct marker __stop___markers[]; /* Set to 1 to enable marker debug output */ -const int marker_debug; +static const int marker_debug; /* * markers_mutex nests inside module_mutex. Markers mutex protects the builtin diff --git a/kernel/pid.c b/kernel/pid.c index 477691576b3..20d59fa2d49 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -111,10 +111,11 @@ EXPORT_SYMBOL(is_container_init); static __cacheline_aligned_in_smp DEFINE_SPINLOCK(pidmap_lock); -static void free_pidmap(struct pid_namespace *pid_ns, int pid) +static void free_pidmap(struct upid *upid) { - struct pidmap *map = pid_ns->pidmap + pid / BITS_PER_PAGE; - int offset = pid & BITS_PER_PAGE_MASK; + int nr = upid->nr; + struct pidmap *map = upid->ns->pidmap + nr / BITS_PER_PAGE; + int offset = nr & BITS_PER_PAGE_MASK; clear_bit(offset, map->page); atomic_inc(&map->nr_free); @@ -232,7 +233,7 @@ void free_pid(struct pid *pid) spin_unlock_irqrestore(&pidmap_lock, flags); for (i = 0; i <= pid->level; i++) - free_pidmap(pid->numbers[i].ns, pid->numbers[i].nr); + free_pidmap(pid->numbers + i); call_rcu(&pid->rcu, delayed_put_pid); } @@ -278,8 +279,8 @@ out: return pid; out_free: - for (i++; i <= ns->level; i++) - free_pidmap(pid->numbers[i].ns, pid->numbers[i].nr); + while (++i <= ns->level) + free_pidmap(pid->numbers + i); kmem_cache_free(ns->pid_cachep, pid); pid = NULL; @@ -316,7 +317,7 @@ EXPORT_SYMBOL_GPL(find_pid); /* * attach_pid() must be called with the tasklist_lock write-held. */ -int attach_pid(struct task_struct *task, enum pid_type type, +void attach_pid(struct task_struct *task, enum pid_type type, struct pid *pid) { struct pid_link *link; @@ -324,11 +325,10 @@ int attach_pid(struct task_struct *task, enum pid_type type, link = &task->pids[type]; link->pid = pid; hlist_add_head_rcu(&link->node, &pid->tasks[type]); - - return 0; } -void detach_pid(struct task_struct *task, enum pid_type type) +static void __change_pid(struct task_struct *task, enum pid_type type, + struct pid *new) { struct pid_link *link; struct pid *pid; @@ -338,7 +338,7 @@ void detach_pid(struct task_struct *task, enum pid_type type) pid = link->pid; hlist_del_rcu(&link->node); - link->pid = NULL; + link->pid = new; for (tmp = PIDTYPE_MAX; --tmp >= 0; ) if (!hlist_empty(&pid->tasks[tmp])) @@ -347,13 +347,24 @@ void detach_pid(struct task_struct *task, enum pid_type type) free_pid(pid); } +void detach_pid(struct task_struct *task, enum pid_type type) +{ + __change_pid(task, type, NULL); +} + +void change_pid(struct task_struct *task, enum pid_type type, + struct pid *pid) +{ + __change_pid(task, type, pid); + attach_pid(task, type, pid); +} + /* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */ void transfer_pid(struct task_struct *old, struct task_struct *new, enum pid_type type) { new->pids[type].pid = old->pids[type].pid; hlist_replace_rcu(&old->pids[type].node, &new->pids[type].node); - old->pids[type].pid = NULL; } struct task_struct *pid_task(struct pid *pid, enum pid_type type) @@ -380,12 +391,6 @@ struct task_struct *find_task_by_pid_type_ns(int type, int nr, EXPORT_SYMBOL(find_task_by_pid_type_ns); -struct task_struct *find_task_by_pid(pid_t nr) -{ - return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns); -} -EXPORT_SYMBOL(find_task_by_pid); - struct task_struct *find_task_by_vpid(pid_t vnr) { return find_task_by_pid_type_ns(PIDTYPE_PID, vnr, diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 5ca37fa50be..98702b4b885 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -66,7 +66,7 @@ err_alloc: return NULL; } -static struct pid_namespace *create_pid_namespace(int level) +static struct pid_namespace *create_pid_namespace(unsigned int level) { struct pid_namespace *ns; int i; diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c index 8476956ffd9..dbd8398ddb0 100644 --- a/kernel/posix-timers.c +++ b/kernel/posix-timers.c @@ -310,8 +310,7 @@ int posix_timer_event(struct k_itimer *timr,int si_private) if (timr->it_sigev_notify & SIGEV_THREAD_ID) { struct task_struct *leader; - int ret = send_sigqueue(timr->it_sigev_signo, timr->sigq, - timr->it_process); + int ret = send_sigqueue(timr->sigq, timr->it_process, 0); if (likely(ret >= 0)) return ret; @@ -322,8 +321,7 @@ int posix_timer_event(struct k_itimer *timr,int si_private) timr->it_process = leader; } - return send_group_sigqueue(timr->it_sigev_signo, timr->sigq, - timr->it_process); + return send_sigqueue(timr->sigq, timr->it_process, 1); } EXPORT_SYMBOL_GPL(posix_timer_event); diff --git a/kernel/printk.c b/kernel/printk.c index d3f9c0f788b..8fb01c32aa3 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -111,6 +111,9 @@ struct console_cmdline char name[8]; /* Name of the driver */ int index; /* Minor dev. to use */ char *options; /* Options for the driver */ +#ifdef CONFIG_A11Y_BRAILLE_CONSOLE + char *brl_options; /* Options for braille driver */ +#endif }; #define MAX_CMDLINECONSOLES 8 @@ -808,15 +811,60 @@ static void call_console_drivers(unsigned start, unsigned end) #endif +static int __add_preferred_console(char *name, int idx, char *options, + char *brl_options) +{ + struct console_cmdline *c; + int i; + + /* + * See if this tty is not yet registered, and + * if we have a slot free. + */ + for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++) + if (strcmp(console_cmdline[i].name, name) == 0 && + console_cmdline[i].index == idx) { + if (!brl_options) + selected_console = i; + return 0; + } + if (i == MAX_CMDLINECONSOLES) + return -E2BIG; + if (!brl_options) + selected_console = i; + c = &console_cmdline[i]; + strlcpy(c->name, name, sizeof(c->name)); + c->options = options; +#ifdef CONFIG_A11Y_BRAILLE_CONSOLE + c->brl_options = brl_options; +#endif + c->index = idx; + return 0; +} /* * Set up a list of consoles. Called from init/main.c */ static int __init console_setup(char *str) { char buf[sizeof(console_cmdline[0].name) + 4]; /* 4 for index */ - char *s, *options; + char *s, *options, *brl_options = NULL; int idx; +#ifdef CONFIG_A11Y_BRAILLE_CONSOLE + if (!memcmp(str, "brl,", 4)) { + brl_options = ""; + str += 4; + } else if (!memcmp(str, "brl=", 4)) { + brl_options = str + 4; + str = strchr(brl_options, ','); + if (!str) { + printk(KERN_ERR "need port name after brl=\n"); + return 1; + } + *(str++) = 0; + } +#endif + /* * Decode str into name, index, options. */ @@ -841,7 +889,7 @@ static int __init console_setup(char *str) idx = simple_strtoul(s, NULL, 10); *s = 0; - add_preferred_console(buf, idx, options); + __add_preferred_console(buf, idx, options, brl_options); return 1; } __setup("console=", console_setup); @@ -861,28 +909,7 @@ __setup("console=", console_setup); */ int add_preferred_console(char *name, int idx, char *options) { - struct console_cmdline *c; - int i; - - /* - * See if this tty is not yet registered, and - * if we have a slot free. - */ - for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++) - if (strcmp(console_cmdline[i].name, name) == 0 && - console_cmdline[i].index == idx) { - selected_console = i; - return 0; - } - if (i == MAX_CMDLINECONSOLES) - return -E2BIG; - selected_console = i; - c = &console_cmdline[i]; - memcpy(c->name, name, sizeof(c->name)); - c->name[sizeof(c->name) - 1] = 0; - c->options = options; - c->index = idx; - return 0; + return __add_preferred_console(name, idx, options, NULL); } int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options) @@ -894,7 +921,7 @@ int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, cha if (strcmp(console_cmdline[i].name, name) == 0 && console_cmdline[i].index == idx) { c = &console_cmdline[i]; - memcpy(c->name, name_new, sizeof(c->name)); + strlcpy(c->name, name_new, sizeof(c->name)); c->name[sizeof(c->name) - 1] = 0; c->options = options; c->index = idx_new; @@ -1163,6 +1190,16 @@ void register_console(struct console *console) continue; if (console->index < 0) console->index = console_cmdline[i].index; +#ifdef CONFIG_A11Y_BRAILLE_CONSOLE + if (console_cmdline[i].brl_options) { + console->flags |= CON_BRL; + braille_register_console(console, + console_cmdline[i].index, + console_cmdline[i].options, + console_cmdline[i].brl_options); + return; + } +#endif if (console->setup && console->setup(console, console_cmdline[i].options) != 0) break; @@ -1221,6 +1258,11 @@ int unregister_console(struct console *console) struct console *a, *b; int res = 1; +#ifdef CONFIG_A11Y_BRAILLE_CONSOLE + if (console->flags & CON_BRL) + return braille_unregister_console(console); +#endif + acquire_console_sem(); if (console_drivers == console) { console_drivers=console->next; @@ -1272,8 +1314,8 @@ late_initcall(disable_boot_consoles); */ void tty_write_message(struct tty_struct *tty, char *msg) { - if (tty && tty->driver->write) - tty->driver->write(tty, msg, strlen(msg)); + if (tty && tty->ops->write) + tty->ops->write(tty, msg, strlen(msg)); return; } diff --git a/kernel/ptrace.c b/kernel/ptrace.c index dac4b4e5729..dcc199c43a1 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -73,7 +73,7 @@ void __ptrace_unlink(struct task_struct *child) BUG_ON(!child->ptrace); child->ptrace = 0; - if (!list_empty(&child->ptrace_list)) { + if (ptrace_reparented(child)) { list_del_init(&child->ptrace_list); remove_parent(child); child->parent = child->real_parent; @@ -168,8 +168,6 @@ int ptrace_attach(struct task_struct *task) audit_ptrace(task); retval = -EPERM; - if (task->pid <= 1) - goto out; if (same_thread_group(task, current)) goto out; @@ -208,8 +206,7 @@ repeat: __ptrace_link(task, current); - force_sig_specific(SIGSTOP, task); - + send_sig_info(SIGSTOP, SEND_SIG_FORCED, task); bad: write_unlock_irqrestore(&tasklist_lock, flags); task_unlock(task); @@ -522,12 +519,6 @@ struct task_struct *ptrace_get_task_struct(pid_t pid) { struct task_struct *child; - /* - * Tracing init is not allowed. - */ - if (pid == 1) - return ERR_PTR(-EPERM); - read_lock(&tasklist_lock); child = find_task_by_vpid(pid); if (child) diff --git a/kernel/signal.c b/kernel/signal.c index 64ad0ed1599..72bb4f51f96 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -39,11 +39,19 @@ static struct kmem_cache *sigqueue_cachep; +static int __sig_ignored(struct task_struct *t, int sig) +{ + void __user *handler; + + /* Is it explicitly or implicitly ignored? */ + + handler = t->sighand->action[sig - 1].sa.sa_handler; + return handler == SIG_IGN || + (handler == SIG_DFL && sig_kernel_ignore(sig)); +} static int sig_ignored(struct task_struct *t, int sig) { - void __user * handler; - /* * Tracers always want to know about signals.. */ @@ -58,10 +66,7 @@ static int sig_ignored(struct task_struct *t, int sig) if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig)) return 0; - /* Is it explicitly or implicitly ignored? */ - handler = t->sighand->action[sig-1].sa.sa_handler; - return handler == SIG_IGN || - (handler == SIG_DFL && sig_kernel_ignore(sig)); + return __sig_ignored(t, sig); } /* @@ -372,7 +377,7 @@ static int __dequeue_signal(struct sigpending *pending, sigset_t *mask, */ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) { - int signr = 0; + int signr; /* We only dequeue private signals from ourselves, we don't let * signalfd steal them @@ -405,8 +410,12 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) } } } + recalc_sigpending(); - if (signr && unlikely(sig_kernel_stop(signr))) { + if (!signr) + return 0; + + if (unlikely(sig_kernel_stop(signr))) { /* * Set a marker that we have dequeued a stop signal. Our * caller might release the siglock and then the pending @@ -422,9 +431,7 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) if (!(tsk->signal->flags & SIGNAL_GROUP_EXIT)) tsk->signal->flags |= SIGNAL_STOP_DEQUEUED; } - if (signr && - ((info->si_code & __SI_MASK) == __SI_TIMER) && - info->si_sys_private) { + if ((info->si_code & __SI_MASK) == __SI_TIMER && info->si_sys_private) { /* * Release the siglock to ensure proper locking order * of timer locks outside of siglocks. Note, we leave @@ -526,21 +533,34 @@ static int rm_from_queue(unsigned long mask, struct sigpending *s) static int check_kill_permission(int sig, struct siginfo *info, struct task_struct *t) { - int error = -EINVAL; + struct pid *sid; + int error; + if (!valid_signal(sig)) - return error; + return -EINVAL; - if (info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info))) { - error = audit_signal_info(sig, t); /* Let audit system see the signal */ - if (error) - return error; - error = -EPERM; - if (((sig != SIGCONT) || - (task_session_nr(current) != task_session_nr(t))) - && (current->euid ^ t->suid) && (current->euid ^ t->uid) - && (current->uid ^ t->suid) && (current->uid ^ t->uid) - && !capable(CAP_KILL)) + if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info))) + return 0; + + error = audit_signal_info(sig, t); /* Let audit system see the signal */ + if (error) return error; + + if ((current->euid ^ t->suid) && (current->euid ^ t->uid) && + (current->uid ^ t->suid) && (current->uid ^ t->uid) && + !capable(CAP_KILL)) { + switch (sig) { + case SIGCONT: + sid = task_session(t); + /* + * We don't return the error if sid == NULL. The + * task was unhashed, the caller must notice this. + */ + if (!sid || sid == task_session(current)) + break; + default: + return -EPERM; + } } return security_task_kill(t, info, sig, 0); @@ -550,62 +570,44 @@ static int check_kill_permission(int sig, struct siginfo *info, static void do_notify_parent_cldstop(struct task_struct *tsk, int why); /* - * Handle magic process-wide effects of stop/continue signals. - * Unlike the signal actions, these happen immediately at signal-generation + * Handle magic process-wide effects of stop/continue signals. Unlike + * the signal actions, these happen immediately at signal-generation * time regardless of blocking, ignoring, or handling. This does the * actual continuing for SIGCONT, but not the actual stopping for stop - * signals. The process stop is done as a signal action for SIG_DFL. + * signals. The process stop is done as a signal action for SIG_DFL. + * + * Returns true if the signal should be actually delivered, otherwise + * it should be dropped. */ -static void handle_stop_signal(int sig, struct task_struct *p) +static int prepare_signal(int sig, struct task_struct *p) { + struct signal_struct *signal = p->signal; struct task_struct *t; - if (p->signal->flags & SIGNAL_GROUP_EXIT) + if (unlikely(signal->flags & SIGNAL_GROUP_EXIT)) { /* - * The process is in the middle of dying already. + * The process is in the middle of dying, nothing to do. */ - return; - - if (sig_kernel_stop(sig)) { + } else if (sig_kernel_stop(sig)) { /* * This is a stop signal. Remove SIGCONT from all queues. */ - rm_from_queue(sigmask(SIGCONT), &p->signal->shared_pending); + rm_from_queue(sigmask(SIGCONT), &signal->shared_pending); t = p; do { rm_from_queue(sigmask(SIGCONT), &t->pending); - t = next_thread(t); - } while (t != p); + } while_each_thread(p, t); } else if (sig == SIGCONT) { + unsigned int why; /* * Remove all stop signals from all queues, * and wake all threads. */ - if (unlikely(p->signal->group_stop_count > 0)) { - /* - * There was a group stop in progress. We'll - * pretend it finished before we got here. We are - * obliged to report it to the parent: if the - * SIGSTOP happened "after" this SIGCONT, then it - * would have cleared this pending SIGCONT. If it - * happened "before" this SIGCONT, then the parent - * got the SIGCHLD about the stop finishing before - * the continue happened. We do the notification - * now, and it's as if the stop had finished and - * the SIGCHLD was pending on entry to this kill. - */ - p->signal->group_stop_count = 0; - p->signal->flags = SIGNAL_STOP_CONTINUED; - spin_unlock(&p->sighand->siglock); - do_notify_parent_cldstop(p, CLD_STOPPED); - spin_lock(&p->sighand->siglock); - } - rm_from_queue(SIG_KERNEL_STOP_MASK, &p->signal->shared_pending); + rm_from_queue(SIG_KERNEL_STOP_MASK, &signal->shared_pending); t = p; do { unsigned int state; rm_from_queue(SIG_KERNEL_STOP_MASK, &t->pending); - /* * If there is a handler for SIGCONT, we must make * sure that no thread returns to user mode before @@ -615,7 +617,7 @@ static void handle_stop_signal(int sig, struct task_struct *p) * running the handler. With the TIF_SIGPENDING * flag set, the thread will pause and acquire the * siglock that we hold now and until we've queued - * the pending signal. + * the pending signal. * * Wake up the stopped thread _after_ setting * TIF_SIGPENDING @@ -626,49 +628,163 @@ static void handle_stop_signal(int sig, struct task_struct *p) state |= TASK_INTERRUPTIBLE; } wake_up_state(t, state); + } while_each_thread(p, t); - t = next_thread(t); - } while (t != p); + /* + * Notify the parent with CLD_CONTINUED if we were stopped. + * + * If we were in the middle of a group stop, we pretend it + * was already finished, and then continued. Since SIGCHLD + * doesn't queue we report only CLD_STOPPED, as if the next + * CLD_CONTINUED was dropped. + */ + why = 0; + if (signal->flags & SIGNAL_STOP_STOPPED) + why |= SIGNAL_CLD_CONTINUED; + else if (signal->group_stop_count) + why |= SIGNAL_CLD_STOPPED; - if (p->signal->flags & SIGNAL_STOP_STOPPED) { + if (why) { /* - * We were in fact stopped, and are now continued. - * Notify the parent with CLD_CONTINUED. + * The first thread which returns from finish_stop() + * will take ->siglock, notice SIGNAL_CLD_MASK, and + * notify its parent. See get_signal_to_deliver(). */ - p->signal->flags = SIGNAL_STOP_CONTINUED; - p->signal->group_exit_code = 0; - spin_unlock(&p->sighand->siglock); - do_notify_parent_cldstop(p, CLD_CONTINUED); - spin_lock(&p->sighand->siglock); + signal->flags = why | SIGNAL_STOP_CONTINUED; + signal->group_stop_count = 0; + signal->group_exit_code = 0; } else { /* * We are not stopped, but there could be a stop * signal in the middle of being processed after * being removed from the queue. Clear that too. */ - p->signal->flags = 0; + signal->flags &= ~SIGNAL_STOP_DEQUEUED; } - } else if (sig == SIGKILL) { + } + + return !sig_ignored(p, sig); +} + +/* + * Test if P wants to take SIG. After we've checked all threads with this, + * it's equivalent to finding no threads not blocking SIG. Any threads not + * blocking SIG were ruled out because they are not running and already + * have pending signals. Such threads will dequeue from the shared queue + * as soon as they're available, so putting the signal on the shared queue + * will be equivalent to sending it to one such thread. + */ +static inline int wants_signal(int sig, struct task_struct *p) +{ + if (sigismember(&p->blocked, sig)) + return 0; + if (p->flags & PF_EXITING) + return 0; + if (sig == SIGKILL) + return 1; + if (task_is_stopped_or_traced(p)) + return 0; + return task_curr(p) || !signal_pending(p); +} + +static void complete_signal(int sig, struct task_struct *p, int group) +{ + struct signal_struct *signal = p->signal; + struct task_struct *t; + + /* + * Now find a thread we can wake up to take the signal off the queue. + * + * If the main thread wants the signal, it gets first crack. + * Probably the least surprising to the average bear. + */ + if (wants_signal(sig, p)) + t = p; + else if (!group || thread_group_empty(p)) + /* + * There is just one thread and it does not need to be woken. + * It will dequeue unblocked signals before it runs again. + */ + return; + else { /* - * Make sure that any pending stop signal already dequeued - * is undone by the wakeup for SIGKILL. + * Otherwise try to find a suitable thread. */ - p->signal->flags = 0; + t = signal->curr_target; + while (!wants_signal(sig, t)) { + t = next_thread(t); + if (t == signal->curr_target) + /* + * No thread needs to be woken. + * Any eligible threads will see + * the signal in the queue soon. + */ + return; + } + signal->curr_target = t; } + + /* + * Found a killable thread. If the signal will be fatal, + * then start taking the whole group down immediately. + */ + if (sig_fatal(p, sig) && + !(signal->flags & (SIGNAL_UNKILLABLE | SIGNAL_GROUP_EXIT)) && + !sigismember(&t->real_blocked, sig) && + (sig == SIGKILL || !(t->ptrace & PT_PTRACED))) { + /* + * This signal will be fatal to the whole group. + */ + if (!sig_kernel_coredump(sig)) { + /* + * Start a group exit and wake everybody up. + * This way we don't have other threads + * running and doing things after a slower + * thread has the fatal signal pending. + */ + signal->flags = SIGNAL_GROUP_EXIT; + signal->group_exit_code = sig; + signal->group_stop_count = 0; + t = p; + do { + sigaddset(&t->pending.signal, SIGKILL); + signal_wake_up(t, 1); + } while_each_thread(p, t); + return; + } + } + + /* + * The signal is already in the shared-pending queue. + * Tell the chosen thread to wake up and dequeue it. + */ + signal_wake_up(t, sig == SIGKILL); + return; +} + +static inline int legacy_queue(struct sigpending *signals, int sig) +{ + return (sig < SIGRTMIN) && sigismember(&signals->signal, sig); } static int send_signal(int sig, struct siginfo *info, struct task_struct *t, - struct sigpending *signals) + int group) { - struct sigqueue * q = NULL; - int ret = 0; + struct sigpending *pending; + struct sigqueue *q; + + assert_spin_locked(&t->sighand->siglock); + if (!prepare_signal(sig, t)) + return 0; + pending = group ? &t->signal->shared_pending : &t->pending; /* - * Deliver the signal to listening signalfds. This must be called - * with the sighand lock held. + * Short-circuit ignored signals and support queuing + * exactly one non-rt signal, so that we can get more + * detailed information about the cause of the signal. */ - signalfd_notify(t, sig); - + if (legacy_queue(pending, sig)) + return 0; /* * fast-pathed signals for kernel-internal things like SIGSTOP * or SIGKILL. @@ -688,7 +804,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t, (is_si_special(info) || info->si_code >= 0))); if (q) { - list_add_tail(&q->list, &signals->list); + list_add_tail(&q->list, &pending->list); switch ((unsigned long) info) { case (unsigned long) SEND_SIG_NOINFO: q->info.si_signo = sig; @@ -718,13 +834,12 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t, } out_set: - sigaddset(&signals->signal, sig); - return ret; + signalfd_notify(t, sig); + sigaddset(&pending->signal, sig); + complete_signal(sig, t, group); + return 0; } -#define LEGACY_QUEUE(sigptr, sig) \ - (((sig) < SIGRTMIN) && sigismember(&(sigptr)->signal, (sig))) - int print_fatal_signals; static void print_fatal_signal(struct pt_regs *regs, int signr) @@ -757,29 +872,16 @@ static int __init setup_print_fatal_signals(char *str) __setup("print-fatal-signals=", setup_print_fatal_signals); +int +__group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p) +{ + return send_signal(sig, info, p, 1); +} + static int specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t) { - int ret = 0; - - BUG_ON(!irqs_disabled()); - assert_spin_locked(&t->sighand->siglock); - - /* Short-circuit ignored signals. */ - if (sig_ignored(t, sig)) - goto out; - - /* Support queueing exactly one non-rt signal, so that we - can get more detailed information about the cause of - the signal. */ - if (LEGACY_QUEUE(&t->pending, sig)) - goto out; - - ret = send_signal(sig, info, t, &t->pending); - if (!ret && !sigismember(&t->blocked, sig)) - signal_wake_up(t, sig == SIGKILL); -out: - return ret; + return send_signal(sig, info, t, 0); } /* @@ -790,7 +892,8 @@ out: * since we do not want to have a signal handler that was blocked * be invoked when user space had explicitly blocked it. * - * We don't want to have recursive SIGSEGV's etc, for example. + * We don't want to have recursive SIGSEGV's etc, for example, + * that is why we also clear SIGNAL_UNKILLABLE. */ int force_sig_info(int sig, struct siginfo *info, struct task_struct *t) @@ -810,6 +913,8 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t) recalc_sigpending_and_wake(t); } } + if (action->sa.sa_handler == SIG_DFL) + t->signal->flags &= ~SIGNAL_UNKILLABLE; ret = specific_send_sig_info(sig, info, t); spin_unlock_irqrestore(&t->sighand->siglock, flags); @@ -823,134 +928,6 @@ force_sig_specific(int sig, struct task_struct *t) } /* - * Test if P wants to take SIG. After we've checked all threads with this, - * it's equivalent to finding no threads not blocking SIG. Any threads not - * blocking SIG were ruled out because they are not running and already - * have pending signals. Such threads will dequeue from the shared queue - * as soon as they're available, so putting the signal on the shared queue - * will be equivalent to sending it to one such thread. - */ -static inline int wants_signal(int sig, struct task_struct *p) -{ - if (sigismember(&p->blocked, sig)) - return 0; - if (p->flags & PF_EXITING) - return 0; - if (sig == SIGKILL) - return 1; - if (task_is_stopped_or_traced(p)) - return 0; - return task_curr(p) || !signal_pending(p); -} - -static void -__group_complete_signal(int sig, struct task_struct *p) -{ - struct task_struct *t; - - /* - * Now find a thread we can wake up to take the signal off the queue. - * - * If the main thread wants the signal, it gets first crack. - * Probably the least surprising to the average bear. - */ - if (wants_signal(sig, p)) - t = p; - else if (thread_group_empty(p)) - /* - * There is just one thread and it does not need to be woken. - * It will dequeue unblocked signals before it runs again. - */ - return; - else { - /* - * Otherwise try to find a suitable thread. - */ - t = p->signal->curr_target; - if (t == NULL) - /* restart balancing at this thread */ - t = p->signal->curr_target = p; - - while (!wants_signal(sig, t)) { - t = next_thread(t); - if (t == p->signal->curr_target) - /* - * No thread needs to be woken. - * Any eligible threads will see - * the signal in the queue soon. - */ - return; - } - p->signal->curr_target = t; - } - - /* - * Found a killable thread. If the signal will be fatal, - * then start taking the whole group down immediately. - */ - if (sig_fatal(p, sig) && !(p->signal->flags & SIGNAL_GROUP_EXIT) && - !sigismember(&t->real_blocked, sig) && - (sig == SIGKILL || !(t->ptrace & PT_PTRACED))) { - /* - * This signal will be fatal to the whole group. - */ - if (!sig_kernel_coredump(sig)) { - /* - * Start a group exit and wake everybody up. - * This way we don't have other threads - * running and doing things after a slower - * thread has the fatal signal pending. - */ - p->signal->flags = SIGNAL_GROUP_EXIT; - p->signal->group_exit_code = sig; - p->signal->group_stop_count = 0; - t = p; - do { - sigaddset(&t->pending.signal, SIGKILL); - signal_wake_up(t, 1); - } while_each_thread(p, t); - return; - } - } - - /* - * The signal is already in the shared-pending queue. - * Tell the chosen thread to wake up and dequeue it. - */ - signal_wake_up(t, sig == SIGKILL); - return; -} - -int -__group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p) -{ - int ret = 0; - - assert_spin_locked(&p->sighand->siglock); - handle_stop_signal(sig, p); - - /* Short-circuit ignored signals. */ - if (sig_ignored(p, sig)) - return ret; - - if (LEGACY_QUEUE(&p->signal->shared_pending, sig)) - /* This is a non-RT signal and we already have one queued. */ - return ret; - - /* - * Put this signal on the shared-pending queue, or fail with EAGAIN. - * We always use the shared queue for process-wide signals, - * to avoid several races. - */ - ret = send_signal(sig, info, p, &p->signal->shared_pending); - if (unlikely(ret)) - return ret; - - __group_complete_signal(sig, p); - return 0; -} - -/* * Nuke all other threads in the group. */ void zap_other_threads(struct task_struct *p) @@ -978,13 +955,11 @@ int __fatal_signal_pending(struct task_struct *tsk) } EXPORT_SYMBOL(__fatal_signal_pending); -/* - * Must be called under rcu_read_lock() or with tasklist_lock read-held. - */ struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long *flags) { struct sighand_struct *sighand; + rcu_read_lock(); for (;;) { sighand = rcu_dereference(tsk->sighand); if (unlikely(sighand == NULL)) @@ -995,6 +970,7 @@ struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long break; spin_unlock_irqrestore(&sighand->siglock, *flags); } + rcu_read_unlock(); return sighand; } @@ -1043,9 +1019,6 @@ int kill_pid_info(int sig, struct siginfo *info, struct pid *pid) struct task_struct *p; rcu_read_lock(); - if (unlikely(sig_needs_tasklist(sig))) - read_lock(&tasklist_lock); - retry: p = pid_task(pid, PIDTYPE_PID); if (p) { @@ -1059,10 +1032,8 @@ retry: */ goto retry; } - - if (unlikely(sig_needs_tasklist(sig))) - read_unlock(&tasklist_lock); rcu_read_unlock(); + return error; } @@ -1159,8 +1130,7 @@ static int kill_something_info(int sig, struct siginfo *info, int pid) */ /* - * These two are the most common entry points. They send a signal - * just to the specific thread. + * The caller must ensure the task can't exit. */ int send_sig_info(int sig, struct siginfo *info, struct task_struct *p) @@ -1175,17 +1145,9 @@ send_sig_info(int sig, struct siginfo *info, struct task_struct *p) if (!valid_signal(sig)) return -EINVAL; - /* - * We need the tasklist lock even for the specific - * thread case (when we don't need to follow the group - * lists) in order to avoid races with "p->sighand" - * going away or changing from under us. - */ - read_lock(&tasklist_lock); spin_lock_irqsave(&p->sighand->siglock, flags); ret = specific_send_sig_info(sig, info, p); spin_unlock_irqrestore(&p->sighand->siglock, flags); - read_unlock(&tasklist_lock); return ret; } @@ -1291,28 +1253,24 @@ void sigqueue_free(struct sigqueue *q) __sigqueue_free(q); } -int send_sigqueue(int sig, struct sigqueue *q, struct task_struct *p) +int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group) { + int sig = q->info.si_signo; + struct sigpending *pending; unsigned long flags; - int ret = 0; + int ret; BUG_ON(!(q->flags & SIGQUEUE_PREALLOC)); - /* - * The rcu based delayed sighand destroy makes it possible to - * run this without tasklist lock held. The task struct itself - * cannot go away as create_timer did get_task_struct(). - * - * We return -1, when the task is marked exiting, so - * posix_timer_event can redirect it to the group leader - */ - rcu_read_lock(); + ret = -1; + if (!likely(lock_task_sighand(t, &flags))) + goto ret; - if (!likely(lock_task_sighand(p, &flags))) { - ret = -1; - goto out_err; - } + ret = 1; /* the signal is ignored */ + if (!prepare_signal(sig, t)) + goto out; + ret = 0; if (unlikely(!list_empty(&q->list))) { /* * If an SI_TIMER entry is already queue just increment @@ -1322,77 +1280,15 @@ int send_sigqueue(int sig, struct sigqueue *q, struct task_struct *p) q->info.si_overrun++; goto out; } - /* Short-circuit ignored signals. */ - if (sig_ignored(p, sig)) { - ret = 1; - goto out; - } - /* - * Deliver the signal to listening signalfds. This must be called - * with the sighand lock held. - */ - signalfd_notify(p, sig); - - list_add_tail(&q->list, &p->pending.list); - sigaddset(&p->pending.signal, sig); - if (!sigismember(&p->blocked, sig)) - signal_wake_up(p, sig == SIGKILL); - -out: - unlock_task_sighand(p, &flags); -out_err: - rcu_read_unlock(); - - return ret; -} - -int -send_group_sigqueue(int sig, struct sigqueue *q, struct task_struct *p) -{ - unsigned long flags; - int ret = 0; - - BUG_ON(!(q->flags & SIGQUEUE_PREALLOC)); - - read_lock(&tasklist_lock); - /* Since it_lock is held, p->sighand cannot be NULL. */ - spin_lock_irqsave(&p->sighand->siglock, flags); - handle_stop_signal(sig, p); - - /* Short-circuit ignored signals. */ - if (sig_ignored(p, sig)) { - ret = 1; - goto out; - } - if (unlikely(!list_empty(&q->list))) { - /* - * If an SI_TIMER entry is already queue just increment - * the overrun count. Other uses should not try to - * send the signal multiple times. - */ - BUG_ON(q->info.si_code != SI_TIMER); - q->info.si_overrun++; - goto out; - } - /* - * Deliver the signal to listening signalfds. This must be called - * with the sighand lock held. - */ - signalfd_notify(p, sig); - - /* - * Put this signal on the shared-pending queue. - * We always use the shared queue for process-wide signals, - * to avoid several races. - */ - list_add_tail(&q->list, &p->signal->shared_pending.list); - sigaddset(&p->signal->shared_pending.signal, sig); - - __group_complete_signal(sig, p); + signalfd_notify(t, sig); + pending = group ? &t->signal->shared_pending : &t->pending; + list_add_tail(&q->list, &pending->list); + sigaddset(&pending->signal, sig); + complete_signal(sig, t, group); out: - spin_unlock_irqrestore(&p->sighand->siglock, flags); - read_unlock(&tasklist_lock); + unlock_task_sighand(t, &flags); +ret: return ret; } @@ -1723,8 +1619,9 @@ static int do_signal_stop(int signr) } else { struct task_struct *t; - if (!likely(sig->flags & SIGNAL_STOP_DEQUEUED) || - unlikely(sig->group_exit_task)) + if (unlikely((sig->flags & (SIGNAL_STOP_DEQUEUED | SIGNAL_UNKILLABLE)) + != SIGNAL_STOP_DEQUEUED) || + unlikely(signal_group_exit(sig))) return 0; /* * There is no group stop already in progress. @@ -1799,8 +1696,9 @@ static int ptrace_signal(int signr, siginfo_t *info, int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie) { - sigset_t *mask = ¤t->blocked; - int signr = 0; + struct sighand_struct *sighand = current->sighand; + struct signal_struct *signal = current->signal; + int signr; relock: /* @@ -1811,16 +1709,32 @@ relock: */ try_to_freeze(); - spin_lock_irq(¤t->sighand->siglock); + spin_lock_irq(&sighand->siglock); + /* + * Every stopped thread goes here after wakeup. Check to see if + * we should notify the parent, prepare_signal(SIGCONT) encodes + * the CLD_ si_code into SIGNAL_CLD_MASK bits. + */ + if (unlikely(signal->flags & SIGNAL_CLD_MASK)) { + int why = (signal->flags & SIGNAL_STOP_CONTINUED) + ? CLD_CONTINUED : CLD_STOPPED; + signal->flags &= ~SIGNAL_CLD_MASK; + spin_unlock_irq(&sighand->siglock); + + read_lock(&tasklist_lock); + do_notify_parent_cldstop(current->group_leader, why); + read_unlock(&tasklist_lock); + goto relock; + } + for (;;) { struct k_sigaction *ka; - if (unlikely(current->signal->group_stop_count > 0) && + if (unlikely(signal->group_stop_count > 0) && do_signal_stop(0)) goto relock; - signr = dequeue_signal(current, mask, info); - + signr = dequeue_signal(current, ¤t->blocked, info); if (!signr) break; /* will return 0 */ @@ -1830,7 +1744,7 @@ relock: continue; } - ka = ¤t->sighand->action[signr-1]; + ka = &sighand->action[signr-1]; if (ka->sa.sa_handler == SIG_IGN) /* Do nothing. */ continue; if (ka->sa.sa_handler != SIG_DFL) { @@ -1852,7 +1766,8 @@ relock: /* * Global init gets no signals it doesn't want. */ - if (is_global_init(current)) + if (unlikely(signal->flags & SIGNAL_UNKILLABLE) && + !signal_group_exit(signal)) continue; if (sig_kernel_stop(signr)) { @@ -1867,14 +1782,14 @@ relock: * We need to check for that and bail out if necessary. */ if (signr != SIGSTOP) { - spin_unlock_irq(¤t->sighand->siglock); + spin_unlock_irq(&sighand->siglock); /* signals can be posted during this window */ if (is_current_pgrp_orphaned()) goto relock; - spin_lock_irq(¤t->sighand->siglock); + spin_lock_irq(&sighand->siglock); } if (likely(do_signal_stop(signr))) { @@ -1889,15 +1804,16 @@ relock: continue; } - spin_unlock_irq(¤t->sighand->siglock); + spin_unlock_irq(&sighand->siglock); /* * Anything else is fatal, maybe with a core dump. */ current->flags |= PF_SIGNALED; - if ((signr != SIGKILL) && print_fatal_signals) - print_fatal_signal(regs, signr); + if (sig_kernel_coredump(signr)) { + if (print_fatal_signals) + print_fatal_signal(regs, signr); /* * If it was able to dump core, this kills all * other threads in the group and synchronizes with @@ -1915,7 +1831,7 @@ relock: do_group_exit(signr); /* NOTREACHED */ } - spin_unlock_irq(¤t->sighand->siglock); + spin_unlock_irq(&sighand->siglock); return signr; } @@ -2259,6 +2175,7 @@ static int do_tkill(int tgid, int pid, int sig) int error; struct siginfo info; struct task_struct *p; + unsigned long flags; error = -ESRCH; info.si_signo = sig; @@ -2267,22 +2184,24 @@ static int do_tkill(int tgid, int pid, int sig) info.si_pid = task_tgid_vnr(current); info.si_uid = current->uid; - read_lock(&tasklist_lock); + rcu_read_lock(); p = find_task_by_vpid(pid); if (p && (tgid <= 0 || task_tgid_vnr(p) == tgid)) { error = check_kill_permission(sig, &info, p); /* * The null signal is a permissions and process existence * probe. No signal is actually delivered. + * + * If lock_task_sighand() fails we pretend the task dies + * after receiving the signal. The window is tiny, and the + * signal is private anyway. */ - if (!error && sig && p->sighand) { - spin_lock_irq(&p->sighand->siglock); - handle_stop_signal(sig, p); + if (!error && sig && lock_task_sighand(p, &flags)) { error = specific_send_sig_info(sig, &info, p); - spin_unlock_irq(&p->sighand->siglock); + unlock_task_sighand(p, &flags); } } - read_unlock(&tasklist_lock); + rcu_read_unlock(); return error; } @@ -2339,13 +2258,14 @@ sys_rt_sigqueueinfo(int pid, int sig, siginfo_t __user *uinfo) int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact) { + struct task_struct *t = current; struct k_sigaction *k; sigset_t mask; if (!valid_signal(sig) || sig < 1 || (act && sig_kernel_only(sig))) return -EINVAL; - k = ¤t->sighand->action[sig-1]; + k = &t->sighand->action[sig-1]; spin_lock_irq(¤t->sighand->siglock); if (oact) @@ -2366,9 +2286,7 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact) * (for example, SIGCHLD), shall cause the pending signal to * be discarded, whether or not it is blocked" */ - if (act->sa.sa_handler == SIG_IGN || - (act->sa.sa_handler == SIG_DFL && sig_kernel_ignore(sig))) { - struct task_struct *t = current; + if (__sig_ignored(t, sig)) { sigemptyset(&mask); sigaddset(&mask, sig); rm_from_queue_full(&mask, &t->signal->shared_pending); @@ -2623,7 +2541,7 @@ asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize) current->state = TASK_INTERRUPTIBLE; schedule(); - set_thread_flag(TIF_RESTORE_SIGMASK); + set_restore_sigmask(); return -ERESTARTNOHAND; } #endif /* __ARCH_WANT_SYS_RT_SIGSUSPEND */ diff --git a/kernel/sys.c b/kernel/sys.c index e423d0d9e6f..895d2d4c949 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -978,8 +978,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid) goto out; if (task_pgrp(p) != pgrp) { - detach_pid(p, PIDTYPE_PGID); - attach_pid(p, PIDTYPE_PGID, pgrp); + change_pid(p, PIDTYPE_PGID, pgrp); set_task_pgrp(p, pid_nr(pgrp)); } @@ -992,54 +991,67 @@ out: asmlinkage long sys_getpgid(pid_t pid) { + struct task_struct *p; + struct pid *grp; + int retval; + + rcu_read_lock(); if (!pid) - return task_pgrp_vnr(current); + grp = task_pgrp(current); else { - int retval; - struct task_struct *p; - - read_lock(&tasklist_lock); - p = find_task_by_vpid(pid); retval = -ESRCH; - if (p) { - retval = security_task_getpgid(p); - if (!retval) - retval = task_pgrp_vnr(p); - } - read_unlock(&tasklist_lock); - return retval; + p = find_task_by_vpid(pid); + if (!p) + goto out; + grp = task_pgrp(p); + if (!grp) + goto out; + + retval = security_task_getpgid(p); + if (retval) + goto out; } + retval = pid_vnr(grp); +out: + rcu_read_unlock(); + return retval; } #ifdef __ARCH_WANT_SYS_GETPGRP asmlinkage long sys_getpgrp(void) { - /* SMP - assuming writes are word atomic this is fine */ - return task_pgrp_vnr(current); + return sys_getpgid(0); } #endif asmlinkage long sys_getsid(pid_t pid) { + struct task_struct *p; + struct pid *sid; + int retval; + + rcu_read_lock(); if (!pid) - return task_session_vnr(current); + sid = task_session(current); else { - int retval; - struct task_struct *p; - - rcu_read_lock(); - p = find_task_by_vpid(pid); retval = -ESRCH; - if (p) { - retval = security_task_getsid(p); - if (!retval) - retval = task_session_vnr(p); - } - rcu_read_unlock(); - return retval; + p = find_task_by_vpid(pid); + if (!p) + goto out; + sid = task_session(p); + if (!sid) + goto out; + + retval = security_task_getsid(p); + if (retval) + goto out; } + retval = pid_vnr(sid); +out: + rcu_read_unlock(); + return retval; } asmlinkage long sys_setsid(void) @@ -1572,11 +1584,8 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) goto out; } - rcu_read_lock(); - if (!lock_task_sighand(p, &flags)) { - rcu_read_unlock(); + if (!lock_task_sighand(p, &flags)) return; - } switch (who) { case RUSAGE_BOTH: @@ -1612,9 +1621,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) default: BUG(); } - unlock_task_sighand(p, &flags); - rcu_read_unlock(); out: cputime_to_timeval(utime, &r->ru_utime); diff --git a/kernel/taskstats.c b/kernel/taskstats.c index 07e86a82807..4a23517169a 100644 --- a/kernel/taskstats.c +++ b/kernel/taskstats.c @@ -183,7 +183,7 @@ static int fill_pid(pid_t pid, struct task_struct *tsk, if (!tsk) { rcu_read_lock(); - tsk = find_task_by_pid(pid); + tsk = find_task_by_vpid(pid); if (tsk) get_task_struct(tsk); rcu_read_unlock(); @@ -230,7 +230,7 @@ static int fill_tgid(pid_t tgid, struct task_struct *first, */ rcu_read_lock(); if (!first) - first = find_task_by_pid(tgid); + first = find_task_by_vpid(tgid); if (!first || !lock_task_sighand(first, &flags)) goto out; @@ -547,7 +547,7 @@ void taskstats_exit(struct task_struct *tsk, int group_dead) if (!stats) goto err; - rc = fill_pid(tsk->pid, tsk, stats); + rc = fill_pid(-1, tsk, stats); if (rc < 0) goto err; diff --git a/kernel/timer.c b/kernel/timer.c index f3d35d4ea42..ceacc662657 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -320,14 +320,130 @@ static void timer_stats_account_timer(struct timer_list *timer) static void timer_stats_account_timer(struct timer_list *timer) {} #endif -/** - * init_timer - initialize a timer. - * @timer: the timer to be initialized - * - * init_timer() must be done to a timer prior calling *any* of the - * other timer functions. +#ifdef CONFIG_DEBUG_OBJECTS_TIMERS + +static struct debug_obj_descr timer_debug_descr; + +/* + * fixup_init is called when: + * - an active object is initialized */ -void init_timer(struct timer_list *timer) +static int timer_fixup_init(void *addr, enum debug_obj_state state) +{ + struct timer_list *timer = addr; + + switch (state) { + case ODEBUG_STATE_ACTIVE: + del_timer_sync(timer); + debug_object_init(timer, &timer_debug_descr); + return 1; + default: + return 0; + } +} + +/* + * fixup_activate is called when: + * - an active object is activated + * - an unknown object is activated (might be a statically initialized object) + */ +static int timer_fixup_activate(void *addr, enum debug_obj_state state) +{ + struct timer_list *timer = addr; + + switch (state) { + + case ODEBUG_STATE_NOTAVAILABLE: + /* + * This is not really a fixup. The timer was + * statically initialized. We just make sure that it + * is tracked in the object tracker. + */ + if (timer->entry.next == NULL && + timer->entry.prev == TIMER_ENTRY_STATIC) { + debug_object_init(timer, &timer_debug_descr); + debug_object_activate(timer, &timer_debug_descr); + return 0; + } else { + WARN_ON_ONCE(1); + } + return 0; + + case ODEBUG_STATE_ACTIVE: + WARN_ON(1); + + default: + return 0; + } +} + +/* + * fixup_free is called when: + * - an active object is freed + */ +static int timer_fixup_free(void *addr, enum debug_obj_state state) +{ + struct timer_list *timer = addr; + + switch (state) { + case ODEBUG_STATE_ACTIVE: + del_timer_sync(timer); + debug_object_free(timer, &timer_debug_descr); + return 1; + default: + return 0; + } +} + +static struct debug_obj_descr timer_debug_descr = { + .name = "timer_list", + .fixup_init = timer_fixup_init, + .fixup_activate = timer_fixup_activate, + .fixup_free = timer_fixup_free, +}; + +static inline void debug_timer_init(struct timer_list *timer) +{ + debug_object_init(timer, &timer_debug_descr); +} + +static inline void debug_timer_activate(struct timer_list *timer) +{ + debug_object_activate(timer, &timer_debug_descr); +} + +static inline void debug_timer_deactivate(struct timer_list *timer) +{ + debug_object_deactivate(timer, &timer_debug_descr); +} + +static inline void debug_timer_free(struct timer_list *timer) +{ + debug_object_free(timer, &timer_debug_descr); +} + +static void __init_timer(struct timer_list *timer); + +void init_timer_on_stack(struct timer_list *timer) +{ + debug_object_init_on_stack(timer, &timer_debug_descr); + __init_timer(timer); +} +EXPORT_SYMBOL_GPL(init_timer_on_stack); + +void destroy_timer_on_stack(struct timer_list *timer) +{ + debug_object_free(timer, &timer_debug_descr); +} +EXPORT_SYMBOL_GPL(destroy_timer_on_stack); + +#else +static inline void debug_timer_init(struct timer_list *timer) { } +static inline void debug_timer_activate(struct timer_list *timer) { } +static inline void debug_timer_deactivate(struct timer_list *timer) { } +#endif + +static void __init_timer(struct timer_list *timer) { timer->entry.next = NULL; timer->base = __raw_get_cpu_var(tvec_bases); @@ -337,6 +453,19 @@ void init_timer(struct timer_list *timer) memset(timer->start_comm, 0, TASK_COMM_LEN); #endif } + +/** + * init_timer - initialize a timer. + * @timer: the timer to be initialized + * + * init_timer() must be done to a timer prior calling *any* of the + * other timer functions. + */ +void init_timer(struct timer_list *timer) +{ + debug_timer_init(timer); + __init_timer(timer); +} EXPORT_SYMBOL(init_timer); void init_timer_deferrable(struct timer_list *timer) @@ -351,6 +480,8 @@ static inline void detach_timer(struct timer_list *timer, { struct list_head *entry = &timer->entry; + debug_timer_deactivate(timer); + __list_del(entry->prev, entry->next); if (clear_pending) entry->next = NULL; @@ -405,6 +536,8 @@ int __mod_timer(struct timer_list *timer, unsigned long expires) ret = 1; } + debug_timer_activate(timer); + new_base = __get_cpu_var(tvec_bases); if (base != new_base) { @@ -450,6 +583,7 @@ void add_timer_on(struct timer_list *timer, int cpu) BUG_ON(timer_pending(timer) || !timer->function); spin_lock_irqsave(&base->lock, flags); timer_set_base(timer, base); + debug_timer_activate(timer); internal_add_timer(base, timer); /* * Check whether the other CPU is idle and needs to be @@ -1086,11 +1220,14 @@ signed long __sched schedule_timeout(signed long timeout) expire = timeout + jiffies; - setup_timer(&timer, process_timeout, (unsigned long)current); + setup_timer_on_stack(&timer, process_timeout, (unsigned long)current); __mod_timer(&timer, expire); schedule(); del_singleshot_timer_sync(&timer); + /* Remove the timer from the object tracker */ + destroy_timer_on_stack(&timer); + timeout = expire - jiffies; out: diff --git a/kernel/user.c b/kernel/user.c index aefbbfa3159..865ecf57a09 100644 --- a/kernel/user.c +++ b/kernel/user.c @@ -384,7 +384,7 @@ void free_uid(struct user_struct *up) local_irq_restore(flags); } -struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid) +struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid) { struct hlist_head *hashent = uidhashentry(ns, uid); struct user_struct *up, *new; @@ -399,26 +399,12 @@ struct user_struct * alloc_uid(struct user_namespace *ns, uid_t uid) spin_unlock_irq(&uidhash_lock); if (!up) { - new = kmem_cache_alloc(uid_cachep, GFP_KERNEL); + new = kmem_cache_zalloc(uid_cachep, GFP_KERNEL); if (!new) goto out_unlock; new->uid = uid; atomic_set(&new->__count, 1); - atomic_set(&new->processes, 0); - atomic_set(&new->files, 0); - atomic_set(&new->sigpending, 0); -#ifdef CONFIG_INOTIFY_USER - atomic_set(&new->inotify_watches, 0); - atomic_set(&new->inotify_devs, 0); -#endif -#ifdef CONFIG_POSIX_MQUEUE - new->mq_bytes = 0; -#endif - new->locked_shm = 0; -#ifdef CONFIG_KEYS - new->uid_keyring = new->session_keyring = NULL; -#endif if (sched_create_user(new) < 0) goto out_free_user; diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 7db251a959c..721093a2256 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -247,7 +247,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq) if (cwq->run_depth > 3) { /* morton gets to eat his hat */ printk("%s: recursion depth exceeded: %d\n", - __FUNCTION__, cwq->run_depth); + __func__, cwq->run_depth); dump_stack(); } while (!list_empty(&cwq->worklist)) { |