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 DBE34C7618B for ; Fri, 17 Mar 2023 11:38:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230189AbjCQLiy (ORCPT ); Fri, 17 Mar 2023 07:38:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230176AbjCQLix (ORCPT ); Fri, 17 Mar 2023 07:38:53 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9029B3E2E for ; Fri, 17 Mar 2023 04:38:15 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id gp15-20020a17090adf0f00b0023d1bbd9f9eso8809304pjb.0 for ; Fri, 17 Mar 2023 04:38:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1679053073; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=+aD01a07TD9YiAyArNVpoWUMoGh41bK5OsvLALwwGTk=; b=kgz33J1KTriakXGsceNyZdDcVQmgksAsmhVAl/JM3kI+JZxyb7q9TueRxzUxqrnVL2 kZ1EPX+wNxy+z5TjRoyR5BMjusEV+Jg6LxJHWmM63Elm3em3Y7vFS720jxtTKOgj1k/H gY3ZfvYcvi0ErSlRIpNvm3Xq2umG0E47PJJA/9gNsWMMG/XMpB3fb5I3vZ/akzgBmYlj 8GVJxiSl+BAdndoDCsSv3H8mfB4HiU/jlGF7zHOhoSiIsVueDXlJ6O9iOZDKvhUADYpe IdiqrLUuq/jRHt6/pLTAwAVDHf4fGULXgYZKDH0z3U7JduJGGKkW9HGS3vD3G9S6pHjm sVwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679053073; 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=+aD01a07TD9YiAyArNVpoWUMoGh41bK5OsvLALwwGTk=; b=Wqm6nBviwjaxtAGtaiWcVt8a//m1bL0fn3T91/x/UR5f+jrd2mTvGTR7hbdmmXzAyl HVXGeYUdCa5m/+bGgodQVZSx2HbgqRbCcOANoHJgOjJeCyem+ObzSGH9t2nLCVmLOHiF Z3WTyBVKW/XBTEJpNayFy2BzYPVj12bBzNgsMkCPq4uuXeM+ywXwGB412y0t4vFFD6JE /7P+YQLXLEcsywfc0O6uAst31hiVbIyxyawBcrz6uOxyBvJpQKsic4H48xHsZRMARL10 HbZ1WVWON8lTUz/0chHZ2ALKyF0J7CTGc9mXoSDMdGwPU9ZXfiC3xMGcv3FPMpLhP4J1 l1sA== X-Gm-Message-State: AO0yUKXrmXHCjDNo66IeN234akRDR5/ppIoN20UlUMK02JSZZASYxlqI LoK7ZaXVYrJaoPBGcTJw0ABuyw== X-Google-Smtp-Source: AK7set+QG1o+yUDrVrmWTPRkmTPPW7OcS7fKYgXunBMDI70R12mYh+xc8Szb1J7aY+sAETv+D8BIqA== X-Received: by 2002:a17:90b:1d87:b0:23b:53d3:b537 with SMTP id pf7-20020a17090b1d8700b0023b53d3b537mr2943778pjb.1.1679053072800; Fri, 17 Mar 2023 04:37:52 -0700 (PDT) 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 n63-20020a17090a2cc500b0023d3845b02bsm1188740pjd.45.2023.03.17.04.37.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Mar 2023 04:37:52 -0700 (PDT) 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 , Conor Dooley , Guo Ren , Al Viro , Andrew Bresticker Subject: [PATCH -next v15 15/19] riscv: signal: validate altstack to reflect Vector Date: Fri, 17 Mar 2023 11:35:34 +0000 Message-Id: <20230317113538.10878-16-andy.chiu@sifive.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230317113538.10878-1-andy.chiu@sifive.com> References: <20230317113538.10878-1-andy.chiu@sifive.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Some extensions, such as Vector, dynamically change footprint on a signal frame, so MINSIGSTKSZ is no longer accurate. For example, an RV64V implementation with vlen = 512 may occupy 2K + 40 + 12 Bytes of a signal frame with the upcoming support. And processes that do not execute any vector instructions do not need to reserve the extra sigframe. So we need a way to guard the allocation size of the sigframe at process runtime according to current status of V. 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 d2d9232498ca..b8ad9a7fc0ad 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 = get_rt_frame_size(true); } + +#ifdef CONFIG_DYNAMIC_SIGFRAME +bool sigaltstack_size_valid(size_t ss_size) +{ + return ss_size > get_rt_frame_size(false); +} +#endif /* CONFIG_DYNAMIC_SIGFRAME */ + -- 2.17.1