diff options
Diffstat (limited to 'kernel/signal.c')
| -rw-r--r-- | kernel/signal.c | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index e93ff0a719a0..60d80ab2601c 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -37,6 +37,7 @@ #include <asm/uaccess.h> #include <asm/unistd.h> #include <asm/siginfo.h> +#include <asm/cacheflush.h> #include "audit.h" /* audit_signal_info() */ /* @@ -59,21 +60,20 @@ static int sig_handler_ignored(void __user *handler, int sig) (handler == SIG_DFL && sig_kernel_ignore(sig)); } -static int sig_task_ignored(struct task_struct *t, int sig, - int from_ancestor_ns) +static int sig_task_ignored(struct task_struct *t, int sig, bool force) { void __user *handler; handler = sig_handler(t, sig); if (unlikely(t->signal->flags & SIGNAL_UNKILLABLE) && - handler == SIG_DFL && !from_ancestor_ns) + handler == SIG_DFL && !force) return 1; return sig_handler_ignored(handler, sig); } -static int sig_ignored(struct task_struct *t, int sig, int from_ancestor_ns) +static int sig_ignored(struct task_struct *t, int sig, bool force) { /* * Blocked signals are never ignored, since the @@ -83,7 +83,7 @@ static int sig_ignored(struct task_struct *t, int sig, int from_ancestor_ns) if (sigismember(&t->blocked, sig) || sigismember(&t->real_blocked, sig)) return 0; - if (!sig_task_ignored(t, sig, from_ancestor_ns)) + if (!sig_task_ignored(t, sig, force)) return 0; /* @@ -856,7 +856,7 @@ static void ptrace_trap_notify(struct task_struct *t) * Returns true if the signal should be actually delivered, otherwise * it should be dropped. */ -static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns) +static int prepare_signal(int sig, struct task_struct *p, bool force) { struct signal_struct *signal = p->signal; struct task_struct *t; @@ -916,7 +916,7 @@ static int prepare_signal(int sig, struct task_struct *p, int from_ancestor_ns) } } - return !sig_ignored(p, sig, from_ancestor_ns); + return !sig_ignored(p, sig, force); } /* @@ -1060,7 +1060,8 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t, assert_spin_locked(&t->sighand->siglock); result = TRACE_SIGNAL_IGNORED; - if (!prepare_signal(sig, t, from_ancestor_ns)) + if (!prepare_signal(sig, t, + from_ancestor_ns || (info == SEND_SIG_FORCED))) goto ret; pending = group ? &t->signal->shared_pending : &t->pending; @@ -1602,7 +1603,7 @@ int send_sigqueue(struct sigqueue *q, struct task_struct *t, int group) ret = 1; /* the signal is ignored */ result = TRACE_SIGNAL_IGNORED; - if (!prepare_signal(sig, t, 0)) + if (!prepare_signal(sig, t, false)) goto out; ret = 0; @@ -1653,6 +1654,15 @@ bool do_notify_parent(struct task_struct *tsk, int sig) BUG_ON(!tsk->ptrace && (tsk->group_leader != tsk || !thread_group_empty(tsk))); + if (sig != SIGCHLD) { + /* + * This is only possible if parent == real_parent. + * Check if it has changed security domain. + */ + if (tsk->parent_exec_id != tsk->parent->self_exec_id) + sig = SIGCHLD; + } + info.si_signo = sig; info.si_errno = 0; /* |