From nobody Thu Dec 18 20:34:27 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8DF1FC001B0 for ; Mon, 14 Aug 2023 04:53:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233200AbjHNEv7 (ORCPT ); Mon, 14 Aug 2023 00:51:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232615AbjHNEvX (ORCPT ); Mon, 14 Aug 2023 00:51:23 -0400 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5E310E63 for ; Sun, 13 Aug 2023 21:51:16 -0700 (PDT) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8BxyerCstlkBesXAA--.39838S3; Mon, 14 Aug 2023 12:51:14 +0800 (CST) Received: from linux.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8DxviO_stlkqmBZAA--.48090S3; Mon, 14 Aug 2023 12:51:12 +0800 (CST) From: Tiezhu Yang To: Huacai Chen Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn Subject: [PATCH v2 1/2] LoongArch: Remove noreturn attribute for die() Date: Mon, 14 Aug 2023 12:51:10 +0800 Message-Id: <1691988671-835-2-git-send-email-yangtiezhu@loongson.cn> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1691988671-835-1-git-send-email-yangtiezhu@loongson.cn> References: <1691988671-835-1-git-send-email-yangtiezhu@loongson.cn> X-CM-TRANSID: AQAAf8DxviO_stlkqmBZAA--.48090S3 X-CM-SenderInfo: p1dqw3xlh2x3gn0dqz5rrqw2lrqou0/ X-Coremail-Antispam: 1Uk129KBj93XoW7AFy5uFW7XF1xJF4rAFy3ZFc_yoW8CrWxpr 4jkayDKrZ8CFs8XryDJa1kZFy3CFZ5J3y7K39F93yFkrnIyw15XrWkGrWq9a1rKryrWFWv qFZYgw1fKFZrAabCm3ZEXasCq-sJn29KB7ZKAUJUUUUr529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUU9Fb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r126r13M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AK xVW8Jr0_Cr1UM2kKe7AKxVWUXVWUAwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07 AIYIkI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWU tVWrXwAv7VC2z280aVAFwI0_Gr0_Cr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7V AKI48JMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI1I0E14v2 6r1Y6r17MI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17 CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r4j6ryUMIIF 0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIx AIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2 KfnxnUUI43ZEXa7IU8XyCJUUUUU== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" If notify_die() returns NOTIFY_STOP, honor the return value from the handler chain invocation in die() as, through a debugger, the fault may have been fixed. It makes sense even if ignoring the event will make the system unstable, by allowing access through a debugger it has been compromised already anyway. So we can remove the noreturn attribute for die() to make our port consistent with x86, arm64, riscv and csky. Commit 20c0d2d44029 ("[PATCH] i386: pass proper trap numbers to die chain handlers") may be the earliest of similar changes. Link: https://lore.kernel.org/all/alpine.DEB.2.21.2308132148500.8596@angie.= orcam.me.uk/ Signed-off-by: Tiezhu Yang --- arch/loongarch/kernel/traps.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c index 8fb5e7a..bbdfc5b 100644 --- a/arch/loongarch/kernel/traps.c +++ b/arch/loongarch/kernel/traps.c @@ -383,16 +383,15 @@ void show_registers(struct pt_regs *regs) =20 static DEFINE_RAW_SPINLOCK(die_lock); =20 -void __noreturn die(const char *str, struct pt_regs *regs) +void die(const char *str, struct pt_regs *regs) { static int die_counter; - int sig =3D SIGSEGV; + int ret; =20 oops_enter(); =20 - if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_nr, - SIGSEGV) =3D=3D NOTIFY_STOP) - sig =3D 0; + ret =3D notify_die(DIE_OOPS, str, regs, 0, + current->thread.trap_nr, SIGSEGV); =20 console_verbose(); raw_spin_lock_irq(&die_lock); @@ -414,7 +413,8 @@ void __noreturn die(const char *str, struct pt_regs *re= gs) if (panic_on_oops) panic("Fatal exception"); =20 - make_task_dead(sig); + if (ret !=3D NOTIFY_STOP) + make_task_dead(SIGSEGV); } =20 static inline void setup_vint_size(unsigned int size) --=20 2.1.0