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 627B0C7EE23 for ; Fri, 24 Feb 2023 17:03:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230088AbjBXRDY (ORCPT ); Fri, 24 Feb 2023 12:03:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229532AbjBXRDX (ORCPT ); Fri, 24 Feb 2023 12:03:23 -0500 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B828C46A2 for ; Fri, 24 Feb 2023 09:03:13 -0800 (PST) Received: by mail-pl1-x636.google.com with SMTP id ky4so153501plb.3 for ; Fri, 24 Feb 2023 09:03:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=gGZWEGHhXqO9OeXhoDxEGsON6GC4YBeiRX5XbYj9IGA=; b=ghKPeKR0G7uqNkPIH1npSQFQIWcsGSKvYwwCyhwQTOj1TK5WP1/aNJ87vT0C1mdcnO ht5/8+RtBaKIBxaPDYvuzQsOxqiMvI534Qu4gaxQ+XfWL9g2HKUXKKWh1ey/XkDk9aE4 uOginkp7cstMsnvp873wEwWYntVED1Z4ero00tYFcx5ZsZFedEvwzeLBaW2pWlE7ZkvX SRYhb5BU8VVVN5y4d3J1ryOd+P61zO/X+cx91jMeI/8uHICjlll5wYhewyKdfmnsTgxM 4UtNUvfkSRXbex1Rs90s99OR/M3QkP960CJkZZXziXCoNG/Qs9eq5X/jSB4btL/i3pcv y8KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=gGZWEGHhXqO9OeXhoDxEGsON6GC4YBeiRX5XbYj9IGA=; b=Yf5OU1h718QI9mHYEHqlxbvfc26ycAtmIrvSUl7dww8vcQA5FbiCTDwElbAVfhkFF2 E1NOmXqCB3s76mdLupQ+uN+j8GSytZWeAj3RPCI0h8GInZDl0Cf6164XFOsX54nqyu+h JWUUSQaQFp5va2tQQSRbD5p3CtDiJ9g83d96TMQPJ8zmeGCPTMxMbYm7hD77fjzoKJBL JZed33TWcgeFNxZeFyNDyeFB12R2a0aznrdZv7yZpLGnb5UEWH3EZs1NR1GUZkdZRFrc B5czWmga5DITvDvPEvKQqDIgHSvya6C1x/vcz5E6o5751uade04i31kIPHDx673vyAos 9PBg== X-Gm-Message-State: AO0yUKUtPVNiij5q5sY+8uAWOrFU3aoYJCBdxuhtapmp0QKHGpURD/f8 KSP1mUUsXUOvyVK/cuNuO3jzZw== X-Google-Smtp-Source: AK7set/PDa9oZC/tYXZAV4EbClHLZdMbVmxGR97qkvUkEEVLbHU3vmzGKHxKFJkEDjHgyyUthiP+iw== X-Received: by 2002:a17:903:1ce:b0:19a:c65d:f97 with SMTP id e14-20020a17090301ce00b0019ac65d0f97mr24637061plh.41.1677258193134; Fri, 24 Feb 2023 09:03:13 -0800 (PST) Received: from hsinchu25.internal.sifive.com (59-124-168-89.hinet-ip.hinet.net. [59.124.168.89]) by smtp.gmail.com with ESMTPSA id b12-20020a170902b60c00b0019472226769sm9234731pls.251.2023.02.24.09.03.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Feb 2023 09:03:12 -0800 (PST) From: Andy Chiu To: linux-riscv@lists.infradead.org, palmer@dabbelt.com, anup@brainfault.org, atishp@atishpatra.org, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org Cc: vineetg@rivosinc.com, greentime.hu@sifive.com, guoren@linux.alibaba.com, Andy Chiu , Paul Walmsley , Albert Ou , Vincent Chen , Guo Ren , Al Viro , Andrew Bresticker Subject: [PATCH -next v14 15/19] riscv: signal: validate altstack to reflect Vector Date: Fri, 24 Feb 2023 17:01:14 +0000 Message-Id: <20230224170118.16766-16-andy.chiu@sifive.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230224170118.16766-1-andy.chiu@sifive.com> References: <20230224170118.16766-1-andy.chiu@sifive.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org MINSIGSTKSZ alone have become less informative by the time an user calls sigaltstack(), as the kernel starts to support extensions that dynamically introduce footprint on a signal frame. For example, an RV64V implementation with vlen = 512 may occupy 2K + 40 + 12 Bytes of a signal frame with the upcoming Vector support. And there is no need for reserving the extra sigframe for some processes that do not execute any V-instructions. Thus, provide the function sigaltstack_size_valid() to validate its size based on current allocation status of supported extensions. Signed-off-by: Andy Chiu --- arch/riscv/kernel/signal.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c index aa8ee95dee2d..aff441e83a98 100644 --- a/arch/riscv/kernel/signal.c +++ b/arch/riscv/kernel/signal.c @@ -494,3 +494,11 @@ void __init init_rt_signal_env(void) */ signal_minsigstksz = cal_rt_frame_size(true); } + +#ifdef CONFIG_DYNAMIC_SIGFRAME +bool sigaltstack_size_valid(size_t ss_size) +{ + return ss_size > cal_rt_frame_size(false); +} +#endif /* CONFIG_DYNAMIC_SIGFRAME */ + -- 2.17.1