Message ID | 20201109125026.372872473@linuxfoundation.org |
---|---|
State | New |
Headers | show
Return-Path: <SRS0=upl/=EP=vger.kernel.org=stable-owner@kernel.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 983A9C2D0A3 for <stable@archiver.kernel.org>; Mon, 9 Nov 2020 13:27:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 493C52083B for <stable@archiver.kernel.org>; Mon, 9 Nov 2020 13:27:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604928459; bh=M0G466X9KyROxK/ZmhJEsQmpTXTT0u9NemVAF6Vjwbo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WWxoIUvfsUWaUEjfVNg46QXdWZgQyGTr16ER/Y3OGuHttTjWI3ioRJMerfSVL6uek aZC4h1PbQIDSHYwzLfuWgoYAxuxMFaeSJk69MBpFxI0P9XQigx5AiyTOHXBqbWg61g AWpARLHqbNsYuhaBagFQdZf6xO6ZnQ0jElWytYi4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731271AbgKIN1Q (ORCPT <rfc822;stable@archiver.kernel.org>); Mon, 9 Nov 2020 08:27:16 -0500 Received: from mail.kernel.org ([198.145.29.99]:41704 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733270AbgKINPE (ORCPT <rfc822;stable@vger.kernel.org>); Mon, 9 Nov 2020 08:15:04 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8FFCA216C4; Mon, 9 Nov 2020 13:15:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927703; bh=M0G466X9KyROxK/ZmhJEsQmpTXTT0u9NemVAF6Vjwbo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oyPE5Fqbyjpfdgt5XkTJ5rvQ4uadmIT74QKn+s5GNMnVpv66zazg2aImPNbthf0NN I3S7X8nebHnBaRNpnguNmcMP0o70WViIsIb2ffq/ydIR1vCjQTCclaGWRbIowFRki3 IH3SA+KQssMWnKDmk94eML3uaCEc013Kpv6c1IHk= From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org, Vineet Gupta <vgupta@synopsys.com> Subject: [PATCH 5.4 79/85] ARC: stack unwinding: avoid indefinite looping Date: Mon, 9 Nov 2020 13:56:16 +0100 Message-Id: <20201109125026.372872473@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125022.614792961@linuxfoundation.org> References: <20201109125022.614792961@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: <stable.vger.kernel.org> X-Mailing-List: stable@vger.kernel.org |
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--- a/arch/arc/kernel/stacktrace.c +++ b/arch/arc/kernel/stacktrace.c @@ -112,7 +112,7 @@ arc_unwind_core(struct task_struct *tsk, int (*consumer_fn) (unsigned int, void *), void *arg) { #ifdef CONFIG_ARC_DW2_UNWIND - int ret = 0; + int ret = 0, cnt = 0; unsigned int address; struct unwind_frame_info frame_info; @@ -132,6 +132,11 @@ arc_unwind_core(struct task_struct *tsk, break; frame_info.regs.r63 = frame_info.regs.r31; + + if (cnt++ > 128) { + printk("unwinder looping too long, aborting !\n"); + return 0; + } } return address; /* return the last address it saw */