linux-kernel - [PATCH v2 5/6] coredump: Stop using group_exit

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Date:   Tue, 23 Jun 2020 16:55:51 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     <linux-kernel@...r.kernel.org>
Cc:     <linux-fsdevel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>, Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Bernd Edlinger <bernd.edlinger@...mail.de>
Subject: [PATCH v2 5/6] coredump: Stop using group_exit_task


Setting and clearing of group_exit_task in the coredump code was added
to affect the outcome of signal_group_exit()[1].  The coredump code
has not grown any other uses for setting group_exit_task since.  Now
that signal_group_exit() no longer tests group_exit_task stop setting
and clearing it.

[1] 6cd8f0acae34 ("coredump: ensure that SIGKILL always kills the dumping thread")
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 fs/coredump.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index 7237f07ff6be..37b71c72ab3a 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -369,7 +369,6 @@ static int zap_threads(struct task_struct *tsk, struct mm_struct *mm,
 	spin_lock_irq(&tsk->sighand->siglock);
 	if (!signal_group_exit(tsk->signal)) {
 		mm->core_state = core_state;
-		tsk->signal->group_exit_task = tsk;
 		nr = zap_process(tsk, exit_code, 0);
 		clear_tsk_thread_flag(tsk, TIF_SIGPENDING);
 	}
@@ -481,7 +480,6 @@ static void coredump_finish(struct mm_struct *mm, bool core_dumped)
 	spin_lock_irq(&current->sighand->siglock);
 	if (core_dumped && !__fatal_signal_pending(current))
 		current->signal->group_exit_code |= 0x80;
-	current->signal->group_exit_task = NULL;
 	current->signal->flags = SIGNAL_GROUP_EXIT;
 	spin_unlock_irq(&current->sighand->siglock);
 
-- 
2.20.1