aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--kernel/signal.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 251cc13720bd..24be82c0aae3 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -533,6 +533,7 @@ static int rm_from_queue(unsigned long mask, struct sigpending *s)
533static int check_kill_permission(int sig, struct siginfo *info, 533static int check_kill_permission(int sig, struct siginfo *info,
534 struct task_struct *t) 534 struct task_struct *t)
535{ 535{
536 struct pid *sid;
536 int error; 537 int error;
537 538
538 if (!valid_signal(sig)) 539 if (!valid_signal(sig))
@@ -545,11 +546,24 @@ static int check_kill_permission(int sig, struct siginfo *info,
545 if (error) 546 if (error)
546 return error; 547 return error;
547 548
548 if (((sig != SIGCONT) || (task_session_nr(current) != task_session_nr(t))) 549 if ((current->euid ^ t->suid) && (current->euid ^ t->uid) &&
549 && (current->euid ^ t->suid) && (current->euid ^ t->uid) 550 (current->uid ^ t->suid) && (current->uid ^ t->uid) &&
550 && (current->uid ^ t->suid) && (current->uid ^ t->uid) 551 !capable(CAP_KILL)) {
551 && !capable(CAP_KILL)) 552 switch (sig) {
552 return -EPERM; 553 case SIGCONT:
554 read_lock(&tasklist_lock);
555 sid = task_session(t);
556 read_unlock(&tasklist_lock);
557 /*
558 * We don't return the error if sid == NULL. The
559 * task was unhashed, the caller must notice this.
560 */
561 if (!sid || sid == task_session(current))
562 break;
563 default:
564 return -EPERM;
565 }
566 }
553 567
554 return security_task_kill(t, info, sig, 0); 568 return security_task_kill(t, info, sig, 0);
555} 569}