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Merge branch 'master' into next

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This commit is contained in:
James Morris 2009-05-08 17:56:47 +10:00
commit d254117099
6181 changed files with 672645 additions and 214147 deletions
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63
kernel/signal.c
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@ -55,10 +55,22 @@ static int sig_handler_ignored(void __user *handler, int sig)
(handler == SIG_DFL && sig_kernel_ignore(sig));
}
static int sig_ignored(struct task_struct *t, int sig)
static int sig_task_ignored(struct task_struct *t, int sig,
int from_ancestor_ns)
{
void __user *handler;
handler = sig_handler(t, sig);
if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) &&
handler == SIG_DFL && !from_ancestor_ns)
return 1;
return sig_handler_ignored(handler, sig);
}
static int sig_ignored(struct task_struct *t, int sig, int from_ancestor_ns)
{
/*
* Blocked signals are never ignored, since the
* signal handler may change by the time it is
@ -67,14 +79,13 @@ static int sig_ignored(struct task_struct *t, int sig)
if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig))
return 0;
handler = sig_handler(t, sig);
if (!sig_handler_ignored(handler, sig))
if (!sig_task_ignored(t, sig, from_ancestor_ns))
return 0;
/*
* Tracers may want to know about even ignored signals.
*/
return !tracehook_consider_ignored_signal(t, sig, handler);
return !tracehook_consider_ignored_signal(t, sig);
}
/*
@ -323,7 +334,7 @@ int unhandled_signal(struct task_struct *tsk, int sig)
return 1;
if (handler != SIG_IGN && handler != SIG_DFL)
return 0;
return !tracehook_consider_fatal_signal(tsk, sig, handler);
return !tracehook_consider_fatal_signal(tsk, sig);
}
@ -629,7 +640,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
* Returns true if the signal should be actually delivered, otherwise
* it should be dropped.
*/
static int prepare_signal(int sig, struct task_struct *p)
static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns)
{
struct signal_struct *signal = p->signal;
struct task_struct *t;
@ -713,7 +724,7 @@ static int prepare_signal(int sig, struct task_struct *p)
}
}
return !sig_ignored(p, sig);
return !sig_ignored(p, sig, from_ancestor_ns);
}
/*
@ -782,7 +793,7 @@ static void complete_signal(int sig, struct task_struct *p, int group)
!(signal->flags & (SIGNAL_UNKILLABLE | SIGNAL_GROUP_EXIT)) &&
!sigismember(&t->real_blocked, sig) &&
(sig == SIGKILL ||
!tracehook_consider_fatal_signal(t, sig, SIG_DFL))) {
!tracehook_consider_fatal_signal(t, sig))) {
/*
* This signal will be fatal to the whole group.
*/
@ -818,8 +829,8 @@ 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,
int group)
static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
int group, int from_ancestor_ns)
{
struct sigpending *pending;
struct sigqueue *q;
@ -827,7 +838,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
trace_sched_signal_send(sig, t);
assert_spin_locked(&t->sighand->siglock);
if (!prepare_signal(sig, t))
if (!prepare_signal(sig, t, from_ancestor_ns))
return 0;
pending = group ? &t->signal->shared_pending : &t->pending;
@ -876,6 +888,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
break;
default:
copy_siginfo(&q->info, info);
if (from_ancestor_ns)
q->info.si_pid = 0;
break;
}
} else if (!is_si_special(info)) {
@ -894,6 +908,20 @@ out_set:
return 0;
}
static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
int group)
{
int from_ancestor_ns = 0;
#ifdef CONFIG_PID_NS
if (!is_si_special(info) && SI_FROMUSER(info) &&
task_pid_nr_ns(current, task_active_pid_ns(t)) <= 0)
from_ancestor_ns = 1;
#endif
return __send_signal(sig, info, t, group, from_ancestor_ns);
}
int print_fatal_signals;
static void print_fatal_signal(struct pt_regs *regs, int signr)
@ -1138,7 +1166,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
if (sig && p->sighand) {
unsigned long flags;
spin_lock_irqsave(&p->sighand->siglock, flags);
ret = __group_send_sig_info(sig, info, p);
ret = __send_signal(sig, info, p, 1, 0);
spin_unlock_irqrestore(&p->sighand->siglock, flags);
}
out_unlock:
@ -1325,7 +1353,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group)
goto ret;
ret = 1; /* the signal is ignored */
if (!prepare_signal(sig, t))
if (!prepare_signal(sig, t, 0))
goto out;
ret = 0;
@ -1849,9 +1877,16 @@ relock:
/*
* Global init gets no signals it doesn't want.
* Container-init gets no signals it doesn't want from same
* container.
*
* Note that if global/container-init sees a sig_kernel_only()
* signal here, the signal must have been generated internally
* or must have come from an ancestor namespace. In either
* case, the signal cannot be dropped.
*/
if (unlikely(signal->flags & SIGNAL_UNKILLABLE) &&
!signal_group_exit(signal))
!sig_kernel_only(signr))
continue;
if (sig_kernel_stop(signr)) {