From mboxrd@z Thu Jan 1 00:00:00 1970 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 48716C433EF for ; Fri, 1 Apr 2022 06:39:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242890AbiDAGk6 (ORCPT ); Fri, 1 Apr 2022 02:40:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245625AbiDAGkj (ORCPT ); Fri, 1 Apr 2022 02:40:39 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 307D0265EA2; Thu, 31 Mar 2022 23:37:43 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BC4DD61166; Fri, 1 Apr 2022 06:37:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CDC0BC340EE; Fri, 1 Apr 2022 06:37:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1648795062; bh=414OsYhcHiLq33cLt18rvojc+oh3UKjWGtO30u65hwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c5eFM82/FuxmKz0hrLP1cUJP+2pIjw7Ai42D7aT6eTix3Nr3gTm7iZwBWzoa5OCur yRxcJWLuI/D56f3y7y+cDTkR20fwoytT55EU5uSRjKc0W1j5CVmAHx95n6u+6v/PJd cSrBiax1syMNccf6AQXhOhNhav8NwBKIo1e0+zJg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Russell King (Oracle)" , Catalin Marinas , James Morse Subject: [PATCH 4.14 09/27] arm64: entry.S: Add ventry overflow sanity checks Date: Fri, 1 Apr 2022 08:36:19 +0200 Message-Id: <20220401063624.498215631@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220401063624.232282121@linuxfoundation.org> References: <20220401063624.232282121@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: X-Mailing-List: stable@vger.kernel.org From: James Morse commit 4330e2c5c04c27bebf89d34e0bc14e6943413067 upstream. Subsequent patches add even more code to the ventry slots. Ensure kernels that overflow a ventry slot don't get built. Reviewed-by: Russell King (Oracle) Reviewed-by: Catalin Marinas Signed-off-by: James Morse Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kernel/entry.S | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -74,6 +74,7 @@ .macro kernel_ventry, el, label, regsize = 64 .align 7 +.Lventry_start\@: #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 alternative_if ARM64_UNMAP_KERNEL_AT_EL0 .if \el == 0 @@ -131,6 +132,7 @@ alternative_else_nop_endif mrs x0, tpidrro_el0 #endif b el\()\el\()_\label +.org .Lventry_start\@ + 128 // Did we overflow the ventry slot? .endm .macro tramp_alias, dst, sym @@ -1036,6 +1038,7 @@ alternative_insn isb, nop, ARM64_WORKARO add x30, x30, #(1b - tramp_vectors) isb ret +.org 1b + 128 // Did we overflow the ventry slot? .endm .macro tramp_exit, regsize = 64