From nobody Mon Apr 6 18:54:57 2026 Received: from mx-2023-1.gwdg.de (mx-2023-1.gwdg.de [134.76.10.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F1E2127467F; Wed, 18 Mar 2026 15:31:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=134.76.10.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773847907; cv=none; b=gQF2JsZD/SUhFK5ME1J6TNVklVxNY2S1cuKJ5qQWkbcz8FgIOWtTLrfWb7g6E5LmZAeCgNQZeyWOwYcNBsIrzbrV86KSDhsqS9dsh2qgSQxwJ2so3s46Dnj3WtOTKzMQlDZaNzuJFIQ22tjNO/vfgOA05OdQfiJdBjulhBYUjt0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773847907; c=relaxed/simple; bh=QJLkRDDkFPVr8xxFQQWBwVrygGNYPOZTFZMqkKJDhJg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=rQp3uGPOWgVAjg3fZC3zvVOTWcbHu/RauBv+bEwIFLddf261S2iqyJXEKIZ/TPL6wCDebRFEgg71CFGVOfmWOxnMUqu3Pk5H1O0S4yWh5Ljj2kKgIcdrfM0QF5XoNqsNmABYl9I75KzyoU62XD2H5PJ1VfoHfC1/XxwtfypbtBI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=cispa.de; spf=pass smtp.mailfrom=cispa.de; dkim=pass (2048-bit key) header.d=cispa.de header.i=@cispa.de header.b=qgaNWjzF; arc=none smtp.client-ip=134.76.10.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=cispa.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cispa.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cispa.de header.i=@cispa.de header.b="qgaNWjzF" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=cispa.de; s=2023-rsa; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:CC:To:From:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=QIrVHzrxROtT8Pq+6qvTeJs6b7GJ1UExCjssaGtW86E=; b=qgaNWjzFS+LUx/PKP4mvgyKAGF e4VzLEdVYJZFkrKx9Gfmt7t/Z/2uRroYSLe9H+fsB3RCKj5O2ttcJP0NY4g3Jg45DLDec5HH7mkJw UoXwxj+rwieyimSf/P5Et4c/97d7WeuYwm4T96LqyTxzNk+cl8IaMSP81YvAIAI+bi4bUUVeIP1/h 4hRoIKgen6tnL/6DbSPz2YGXGtYvIiU8XVZps+WAtSqc/hdgzn1ALf+vru1oydf3fPiW3J/BpsR05 v3d0RHTJ7UtT1iygrw4Wf+JNujZKo3JFqSeQaFXlm3LWOmdVQZ3ISAR4DtkxjvmAIcbcm59Ym3edQ Jb87CP4w==; Received: from mailer.gwdg.de ([134.76.10.26]:32839) by mailer.gwdg.de with esmtp (GWDG Mailer) (envelope-from ) id 1w2sfI-00EBLp-29; Wed, 18 Mar 2026 16:18:33 +0100 Received: from mbx19-sub-04.um.gwdg.de ([10.108.142.69] helo=email.gwdg.de) by mailer.gwdg.de with esmtps (TLS1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (GWDG Mailer) (envelope-from ) id 1w2sfJ-0002pj-11; Wed, 18 Mar 2026 16:18:33 +0100 Received: from Laptop.fritz.box (10.250.9.200) by MBX19-SUB-04.um.gwdg.de (10.108.142.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.37; Wed, 18 Mar 2026 16:18:32 +0100 From: Lorenz Hetterich To: CC: , , Lorenz Hetterich Subject: [PATCH 1/2] Loongarch: Fix stale value in __do_page_fault() Date: Wed, 18 Mar 2026 16:18:20 +0100 Message-ID: <20260318151821.190439-2-lorenz.hetterich@cispa.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260318151821.190439-1-lorenz.hetterich@cispa.de> References: <20260318151821.190439-1-lorenz.hetterich@cispa.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MBX19-GWD-03.um.gwdg.de (10.108.142.56) To MBX19-SUB-04.um.gwdg.de (10.108.142.69) X-Virus-Scanned: (clean) by clamav X-Spam-Level: - Content-Type: text/plain; charset="utf-8" __do_page_fault() calls kprobe_page_fault without setting current->thread.trap_nr first. Hence, kprobe_page_fault is called with a stale trapnr. Set current->thread.trap_nr before calling kprobe_page_fault. Signed-off-by: Lorenz Hetterich --- arch/loongarch/mm/fault.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/loongarch/mm/fault.c b/arch/loongarch/mm/fault.c index 2c93d33356e5..c7703bdec4fc 100644 --- a/arch/loongarch/mm/fault.c +++ b/arch/loongarch/mm/fault.c @@ -182,6 +182,7 @@ static void __kprobes __do_page_fault(struct pt_regs *r= egs, struct vm_area_struct *vma =3D NULL; vm_fault_t fault; =20 + current->thread.trap_nr =3D read_csr_excode(); if (kprobe_page_fault(regs, current->thread.trap_nr)) return; =20 --=20 2.43.0