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-rw-r--r--kernel/exit.c110
1 files changed, 57 insertions, 53 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 06de6c4e8ca3..35401720635b 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -13,7 +13,7 @@
#include <linux/completion.h>
#include <linux/personality.h>
#include <linux/tty.h>
-#include <linux/namespace.h>
+#include <linux/mnt_namespace.h>
#include <linux/key.h>
#include <linux/security.h>
#include <linux/cpu.h>
@@ -22,6 +22,7 @@
#include <linux/file.h>
#include <linux/binfmts.h>
#include <linux/nsproxy.h>
+#include <linux/pid_namespace.h>
#include <linux/ptrace.h>
#include <linux/profile.h>
#include <linux/mount.h>
@@ -48,7 +49,6 @@
#include <asm/mmu_context.h>
extern void sem_exit (void);
-extern struct task_struct *child_reaper;
static void exit_mm(struct task_struct * tsk);
@@ -189,21 +189,18 @@ repeat:
int session_of_pgrp(int pgrp)
{
struct task_struct *p;
- int sid = -1;
+ int sid = 0;
read_lock(&tasklist_lock);
- do_each_task_pid(pgrp, PIDTYPE_PGID, p) {
- if (p->signal->session > 0) {
- sid = p->signal->session;
- goto out;
- }
- } while_each_task_pid(pgrp, PIDTYPE_PGID, p);
- p = find_task_by_pid(pgrp);
- if (p)
- sid = p->signal->session;
-out:
+
+ p = find_task_by_pid_type(PIDTYPE_PGID, pgrp);
+ if (p == NULL)
+ p = find_task_by_pid(pgrp);
+ if (p != NULL)
+ sid = process_session(p);
+
read_unlock(&tasklist_lock);
-
+
return sid;
}
@@ -225,8 +222,8 @@ static int will_become_orphaned_pgrp(int pgrp, struct task_struct *ignored_task)
|| p->exit_state
|| is_init(p->real_parent))
continue;
- if (process_group(p->real_parent) != pgrp
- && p->real_parent->signal->session == p->signal->session) {
+ if (process_group(p->real_parent) != pgrp &&
+ process_session(p->real_parent) == process_session(p)) {
ret = 0;
break;
}
@@ -260,7 +257,8 @@ static int has_stopped_jobs(int pgrp)
}
/**
- * reparent_to_init - Reparent the calling kernel thread to the init task.
+ * reparent_to_init - Reparent the calling kernel thread to the init task
+ * of the pid space that the thread belongs to.
*
* If a kernel thread is launched as a result of a system call, or if
* it ever exits, it should generally reparent itself to init so that
@@ -278,8 +276,8 @@ static void reparent_to_init(void)
ptrace_unlink(current);
/* Reparent to init */
remove_parent(current);
- current->parent = child_reaper;
- current->real_parent = child_reaper;
+ current->parent = child_reaper(current);
+ current->real_parent = child_reaper(current);
add_parent(current);
/* Set the exit signal to SIGCHLD so we signal init on exit */
@@ -302,9 +300,9 @@ void __set_special_pids(pid_t session, pid_t pgrp)
{
struct task_struct *curr = current->group_leader;
- if (curr->signal->session != session) {
+ if (process_session(curr) != session) {
detach_pid(curr, PIDTYPE_SID);
- curr->signal->session = session;
+ set_signal_session(curr->signal, session);
attach_pid(curr, PIDTYPE_SID, session);
}
if (process_group(curr) != pgrp) {
@@ -314,7 +312,7 @@ void __set_special_pids(pid_t session, pid_t pgrp)
}
}
-void set_special_pids(pid_t session, pid_t pgrp)
+static void set_special_pids(pid_t session, pid_t pgrp)
{
write_lock_irq(&tasklist_lock);
__set_special_pids(session, pgrp);
@@ -384,9 +382,7 @@ void daemonize(const char *name, ...)
exit_mm(current);
set_special_pids(1, 1);
- mutex_lock(&tty_mutex);
- current->signal->tty = NULL;
- mutex_unlock(&tty_mutex);
+ proc_clear_tty(current);
/* Block and flush all signals */
sigfillset(&blocked);
@@ -429,7 +425,7 @@ static void close_files(struct files_struct * files)
for (;;) {
unsigned long set;
i = j * __NFDBITS;
- if (i >= fdt->max_fdset || i >= fdt->max_fds)
+ if (i >= fdt->max_fds)
break;
set = fdt->open_fds->fds_bits[j++];
while (set) {
@@ -470,9 +466,7 @@ void fastcall put_files_struct(struct files_struct *files)
* you can free files immediately.
*/
fdt = files_fdtable(files);
- if (fdt == &files->fdtab)
- fdt->free_files = files;
- else
+ if (fdt != &files->fdtab)
kmem_cache_free(files_cachep, files);
free_fdtable(fdt);
}
@@ -603,10 +597,6 @@ choose_new_parent(struct task_struct *p, struct task_struct *reaper)
static void
reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
{
- /* We don't want people slaying init. */
- if (p->exit_signal != -1)
- p->exit_signal = SIGCHLD;
-
if (p->pdeath_signal)
/* We already hold the tasklist_lock here. */
group_send_sig_info(p->pdeath_signal, SEND_SIG_NOINFO, p);
@@ -626,13 +616,7 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
p->parent = p->real_parent;
add_parent(p);
- /* If we'd notified the old parent about this child's death,
- * also notify the new parent.
- */
- if (p->exit_state == EXIT_ZOMBIE && p->exit_signal != -1 &&
- thread_group_empty(p))
- do_notify_parent(p, p->exit_signal);
- else if (p->state == TASK_TRACED) {
+ if (p->state == TASK_TRACED) {
/*
* If it was at a trace stop, turn it into
* a normal stop since it's no longer being
@@ -642,6 +626,23 @@ 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)
+ return;
+
+ /* We don't want people slaying init. */
+ if (p->exit_signal != -1)
+ 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))
+ do_notify_parent(p, p->exit_signal);
+
/*
* process group orphan check
* Case ii: Our child is in a different pgrp
@@ -649,10 +650,11 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
* outside, so the child pgrp is now orphaned.
*/
if ((process_group(p) != process_group(father)) &&
- (p->signal->session == father->signal->session)) {
+ (process_session(p) == process_session(father))) {
int pgrp = process_group(p);
- if (will_become_orphaned_pgrp(pgrp, NULL) && has_stopped_jobs(pgrp)) {
+ if (will_become_orphaned_pgrp(pgrp, NULL) &&
+ has_stopped_jobs(pgrp)) {
__kill_pg_info(SIGHUP, SEND_SIG_PRIV, pgrp);
__kill_pg_info(SIGCONT, SEND_SIG_PRIV, pgrp);
}
@@ -663,7 +665,8 @@ reparent_thread(struct task_struct *p, struct task_struct *father, int traced)
* When we die, we re-parent all our children.
* Try to give them to another thread in our thread
* group, and if no such member exists, give it to
- * the global child reaper process (ie "init")
+ * the child reaper process (ie "init") in our pid
+ * space.
*/
static void
forget_original_parent(struct task_struct *father, struct list_head *to_release)
@@ -674,7 +677,7 @@ forget_original_parent(struct task_struct *father, struct list_head *to_release)
do {
reaper = next_thread(reaper);
if (reaper == father) {
- reaper = child_reaper;
+ reaper = child_reaper(father);
break;
}
} while (reaper->exit_state);
@@ -786,7 +789,7 @@ static void exit_notify(struct task_struct *tsk)
t = tsk->real_parent;
if ((process_group(t) != process_group(tsk)) &&
- (t->signal->session == tsk->signal->session) &&
+ (process_session(t) == process_session(tsk)) &&
will_become_orphaned_pgrp(process_group(tsk), tsk) &&
has_stopped_jobs(process_group(tsk))) {
__kill_pg_info(SIGHUP, SEND_SIG_PRIV, process_group(tsk));
@@ -850,9 +853,7 @@ static void exit_notify(struct task_struct *tsk)
fastcall NORET_TYPE void do_exit(long code)
{
struct task_struct *tsk = current;
- struct taskstats *tidstats;
int group_dead;
- unsigned int mycpu;
profile_task_exit(tsk);
@@ -862,8 +863,13 @@ fastcall NORET_TYPE void do_exit(long code)
panic("Aiee, killing interrupt handler!");
if (unlikely(!tsk->pid))
panic("Attempted to kill the idle task!");
- if (unlikely(tsk == child_reaper))
- panic("Attempted to kill init!");
+ if (unlikely(tsk == child_reaper(tsk))) {
+ if (tsk->nsproxy->pid_ns != &init_pid_ns)
+ tsk->nsproxy->pid_ns->child_reaper = init_pid_ns.child_reaper;
+ else
+ panic("Attempted to kill init!");
+ }
+
if (unlikely(current->ptrace & PT_TRACE_EXIT)) {
current->ptrace_message = code;
@@ -890,8 +896,6 @@ fastcall NORET_TYPE void do_exit(long code)
current->comm, current->pid,
preempt_count());
- taskstats_exit_alloc(&tidstats, &mycpu);
-
acct_update_integrals(tsk);
if (tsk->mm) {
update_hiwater_rss(tsk->mm);
@@ -911,8 +915,8 @@ fastcall NORET_TYPE void do_exit(long code)
#endif
if (unlikely(tsk->audit_context))
audit_free(tsk);
- taskstats_exit_send(tsk, tidstats, group_dead, mycpu);
- taskstats_exit_free(tidstats);
+
+ taskstats_exit(tsk, group_dead);
exit_mm(tsk);
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