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[2620:137:e000::1:20]) by mx.google.com with ESMTP id bs8-20020a632808000000b0053f21272753si7334703pgb.9.2023.06.06.07.47.20; Tue, 06 Jun 2023 07:47:33 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=zYwP+c1d; dkim=neutral (no key) header.i=@linutronix.de header.s=2020e; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238291AbjFFOkc (ORCPT + 99 others); Tue, 6 Jun 2023 10:40:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238231AbjFFOjV (ORCPT ); Tue, 6 Jun 2023 10:39:21 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 04A421730 for ; Tue, 6 Jun 2023 07:38:22 -0700 (PDT) Message-ID: <20230606142032.881951490@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1686062291; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=F1AIORQBsb8Q0wbN0ersqX3Q8WiAIjYPdK55avtTgbc=; b=zYwP+c1d0TKBY7umwUqJyZjwLRc75LhgtytLBn0aq2G7R+AEjzhXBYIIc0fMDCIezfOwju EfDzX3nUqEs7bEu4nFl8TNqFvnUb3gEV9jdmdsOKAiiVVWG+sjpYC0yoI5AT2EpQrAubF4 8U40jBTqyal18gawuojiioVpDPLa7G1irpHhsrUayCyedCUUitLHCjcz8nO1WV+pKkotKP oUbnNHJNKUMgrt16vS9OHNRm5n67pBjDPk1x9q6KEqWwqdCa8jIK7mMjvtPJDVxYygNgTs hVTBSjN1kruivBXxTnTLJTS7oHHj5Dy3Koz/4kh+tjAUjTPsJKTtE+HlZd2GYw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1686062291; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=F1AIORQBsb8Q0wbN0ersqX3Q8WiAIjYPdK55avtTgbc=; b=PXGS/1RDSbPqccGdfDQYlb/tXnCiLRy+k6oowj4ENqJgwDUvgVlmb55JC5BmOLQiKgKG7W PU5cWxeT8xHU+vCQ== From: Thomas Gleixner To: LKML Cc: Frederic Weisbecker , Anna-Maria Behnsen , John Stultz , Peter Zijlstra , Ingo Molnar , Stephen Boyd , Eric Biederman , Oleg Nesterov Subject: [patch 33/45] signal: Provide posixtimer_sigqueue_init() References: <20230606132949.068951363@linutronix.de> MIME-Version: 1.0 Date: Tue, 6 Jun 2023 16:38:11 +0200 (CEST) X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1767965042463498003?= X-GMAIL-MSGID: =?utf-8?q?1767965042463498003?= To cure the SIG_IGN handling for posix interval timers, the preallocated sigqueue needs to be embedded into struct k_itimer to prevent life time races of all sorts. Provide a new function to initialize the embedded sigqueue to prepare for that. Signed-off-by: Thomas Gleixner --- include/linux/posix-timers.h | 1 + kernel/signal.c | 11 +++++++++++ 2 files changed, 12 insertions(+) --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -168,6 +168,7 @@ static inline void posix_cputimers_rt_wa } void posixtimer_rearm_itimer(struct task_struct *p); +bool posixtimer_init_sigqueue(struct sigqueue *q); bool posixtimer_deliver_signal(struct kernel_siginfo *info); void posixtimer_free_timer(struct k_itimer *timer); --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1901,6 +1901,17 @@ void flush_itimer_signals(void) spin_unlock_irqrestore(&tsk->sighand->siglock, flags); } +bool posixtimer_init_sigqueue(struct sigqueue *q) +{ + struct ucounts *ucounts = sig_get_ucounts(current, -1, 0); + + if (!ucounts) + return false; + clear_siginfo(&q->info); + __sigqueue_init(q, ucounts, SIGQUEUE_PREALLOC); + return true; +} + struct sigqueue *sigqueue_alloc(void) { return __sigqueue_alloc(-1, current, GFP_KERNEL, 0, SIGQUEUE_PREALLOC);