Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932484Ab3DDADV (ORCPT ); Wed, 3 Apr 2013 20:03:21 -0400 Received: from wolverine02.qualcomm.com ([199.106.114.251]:4834 "EHLO wolverine02.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932350Ab3DDADS (ORCPT ); Wed, 3 Apr 2013 20:03:18 -0400 X-IronPort-AV: E=Sophos;i="4.87,404,1363158000"; d="scan'208";a="35720037" From: Richard Kuo To: linux-arch@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, viro@ZenIV.linux.org.uk Cc: Richard Kuo Subject: [PATCH 4/6] Hexagon: check to if we will overflow the signal stack Date: Wed, 3 Apr 2013 19:02:54 -0500 Message-Id: <1365033776-21804-5-git-send-email-rkuo@codeaurora.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1365033776-21804-1-git-send-email-rkuo@codeaurora.org> References: <1365033776-21804-1-git-send-email-rkuo@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1183 Lines: 33 Signed-off-by: Richard Kuo --- arch/hexagon/kernel/signal.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c index 8a20e8e..097623c 100644 --- a/arch/hexagon/kernel/signal.c +++ b/arch/hexagon/kernel/signal.c @@ -41,6 +41,10 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, { unsigned long sp = regs->r29; + /* check if we would overflow the alt stack */ + if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size))) + return (void __user __force *)-1UL; + /* Switch to signal stack if appropriate */ if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0)) sp = current->sas_ss_sp + current->sas_ss_size; -- 1.7.9.5 -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/