From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out03.mta.xmission.com ([166.70.13.233]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1njU3N-00GX6q-5K for linux-um@lists.infradead.org; Tue, 26 Apr 2022 22:53:06 +0000 From: "Eric W. Biederman" Date: Tue, 26 Apr 2022 17:52:09 -0500 Message-Id: <20220426225211.308418-7-ebiederm@xmission.com> In-Reply-To: <878rrrh32q.fsf_-_@email.froward.int.ebiederm.org> References: <878rrrh32q.fsf_-_@email.froward.int.ebiederm.org> MIME-Version: 1.0 Subject: [PATCH 7/9] ptrace: Simplify the wait_task_inactive call in ptrace_check_attach List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-um" Errors-To: linux-um-bounces+geert=linux-m68k.org@lists.infradead.org To: linux-kernel@vger.kernel.org Cc: rjw@rjwysocki.net, Oleg Nesterov , mingo@kernel.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, mgorman@suse.de, bigeasy@linutronix.de, Will Deacon , tj@kernel.org, linux-pm@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Chris Zankel , Max Filippov , inux-xtensa@linux-xtensa.org, Kees Cook , Jann Horn , "Eric W. Biederman" Asking wait_task_inactive to verify that tsk->__state == __TASK_TRACED was needed to detect the when ptrace_stop would decide not to stop after calling "set_special_state(TASK_TRACED)". With the recent cleanups ptrace_stop will always stop after calling set_special_state. Take advatnage of this by no longer asking wait_task_inactive to verify the state. If a bug is hit and wait_task_inactive does not succeed warn and return -ESRCH. Signed-off-by: "Eric W. Biederman" --- kernel/ptrace.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 16d1a84a2cae..0634da7ac685 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -265,17 +265,9 @@ static int ptrace_check_attach(struct task_struct *child, bool ignore_state) } read_unlock(&tasklist_lock); - if (!ret && !ignore_state) { - if (!wait_task_inactive(child, __TASK_TRACED)) { - /* - * This can only happen if may_ptrace_stop() fails and - * ptrace_stop() changes ->state back to TASK_RUNNING, - * so we should not worry about leaking __TASK_TRACED. - */ - WARN_ON(READ_ONCE(child->__state) == __TASK_TRACED); - ret = -ESRCH; - } - } + if (!ret && !ignore_state && + WARN_ON_ONCE(!wait_task_inactive(child, 0))) + ret = -ESRCH; return ret; } -- 2.35.3 _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um