From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out02.mta.xmission.com ([166.70.13.232]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nkYUO-00Cq2m-03 for linux-um@lists.infradead.org; Fri, 29 Apr 2022 21:49:25 +0000 From: "Eric W. Biederman" Date: Fri, 29 Apr 2022 16:48:34 -0500 Message-Id: <20220429214837.386518-9-ebiederm@xmission.com> In-Reply-To: <87k0b7v9yk.fsf_-_@email.froward.int.ebiederm.org> References: <87k0b7v9yk.fsf_-_@email.froward.int.ebiederm.org> MIME-Version: 1.0 Subject: [PATCH v2 09/12] ptrace: Always take siglock in ptrace_resume 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 , linux-xtensa@linux-xtensa.org, Kees Cook , Jann Horn , linux-ia64@vger.kernel.org, "Eric W. Biederman" Make code analysis simpler and future changes easier by always taking siglock in ptrace_resume. Signed-off-by: "Eric W. Biederman" --- kernel/ptrace.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 22041531adf6..c1c99e8be147 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -845,8 +845,6 @@ static long ptrace_get_rseq_configuration(struct task_struct *task, static int ptrace_resume(struct task_struct *child, long request, unsigned long data) { - bool need_siglock; - if (!valid_signal(data)) return -EIO; @@ -882,18 +880,11 @@ static int ptrace_resume(struct task_struct *child, long request, * Note that we need siglock even if ->exit_code == data and/or this * status was not reported yet, the new status must not be cleared by * wait_task_stopped() after resume. - * - * If data == 0 we do not care if wait_task_stopped() reports the old - * status and clears the code too; this can't race with the tracee, it - * takes siglock after resume. */ - need_siglock = data && !thread_group_empty(current); - if (need_siglock) - spin_lock_irq(&child->sighand->siglock); + spin_lock_irq(&child->sighand->siglock); child->exit_code = data; wake_up_state(child, __TASK_TRACED); - if (need_siglock) - spin_unlock_irq(&child->sighand->siglock); + spin_unlock_irq(&child->sighand->siglock); return 0; } -- 2.35.3 _______________________________________________ linux-um mailing list linux-um@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-um