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 B00E2C433FE for ; Wed, 2 Nov 2022 11:06:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230305AbiKBLGT (ORCPT ); Wed, 2 Nov 2022 07:06:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229518AbiKBLGQ (ORCPT ); Wed, 2 Nov 2022 07:06:16 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3188824945 for ; Wed, 2 Nov 2022 04:06:16 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 204-20020a2510d5000000b006be7970889cso16185960ybq.21 for ; Wed, 02 Nov 2022 04:06:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=ZbeyMEB1N3HnW3KuOlIdq7/dvvJzr15HTa/zFi9USr4=; b=Zys9RxGxneSiAkiaMSLp0fMMah4Q4Z9cQekcJkJNg09vNC8uJQw/eYHIdshUK8sloS ooGakxYdVsGGFtO0vf+eL1zU+0H2llK4TNEmcMhroLHzQrTPZfBWQDBojDOhblkUEr4Y VlVIHNHQhO38wMiB66DPLA3LFQdtHMrbm5ZhgUQeygogmoqNQKhuvL5oPo0DAC2/5AVe qCxhIyoFmRsOF+cCGGErqjcW2MS+JPt+pV98fCT/Hsinr2F1udxrRJ8ikXkJHQoEIYa3 nXngezqkGCOS882wdt6JuoQoJ6omP88TBbF3foaf3Ou/PIbwm73m0hBRCxKUIYBtx6df B0dg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ZbeyMEB1N3HnW3KuOlIdq7/dvvJzr15HTa/zFi9USr4=; b=aeaVomlXtA/VenbrXTONU+mIhkhBODY+4e6BfFjvk4Avk4/CN+GgGc81DV4W9Q/dHT yzRLydT6CJbrshE3tLJ18x3W77otuMCUHN0SnRjTfGsCdkhrhXaywyd+FPAMLFVRWxlD NMmbX9ySsQ4za8RTG7BB6KUy2k9LyP0viC5eq1njpqOtDZkbECo5Y/hDnZs7pao9HyDq 4fI9RySfj7zdJwp6+FKqV44Xv+zD2KtXzXyU30bSE4D3LQJxnVBcaBAjIhd6F7bWPXPi QKAfAeLZ3jzyS/FJwA4jYFxsKvE2glLcIhR0vXTSdAV6gv81V4djRvp7WnucusJMfFGs SJhA== X-Gm-Message-State: ACrzQf1hkDPLOla0UJmcpRomsbJpTvaG7m1MskjRubLkunbrv7xu5She 02SbipwjNx0mH7zHckLczHWaHcTHekU= X-Google-Smtp-Source: AMsMyM4hS7slDYBeV5u3u/VgJ5G2C644lj/pYCkRoBPNBgg3H29Xs+iNPOC5zuesvbC6tPeF8YMpu8KFAb4= X-Received: from glider.muc.corp.google.com ([2a00:79e0:9c:201:7f41:af20:8:a96d]) (user=glider job=sendgmr) by 2002:a25:2187:0:b0:6b0:1abc:2027 with SMTP id h129-20020a252187000000b006b01abc2027mr22399213ybh.348.1667387175509; Wed, 02 Nov 2022 04:06:15 -0700 (PDT) Date: Wed, 2 Nov 2022 12:06:07 +0100 Mime-Version: 1.0 X-Mailer: git-send-email 2.38.1.273.g43a17bfeac-goog Message-ID: <20221102110611.1085175-1-glider@google.com> Subject: [PATCH 1/5] kmsan: core: kmsan_in_runtime() should return true in NMI context From: Alexander Potapenko To: glider@google.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Dmitry Vyukov , Marco Elver , Peter Zijlstra Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Without that, every call to __msan_poison_alloca() in NMI may end up allocating memory, which is NMI-unsafe. Cc: Andrew Morton Cc: Dmitry Vyukov Cc: Marco Elver Cc: Peter Zijlstra (Intel) Link: https://lore.kernel.org/lkml/20221025221755.3810809-1-glider@google.com/ Signed-off-by: Alexander Potapenko --- mm/kmsan/kmsan.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/kmsan/kmsan.h b/mm/kmsan/kmsan.h index 961eb658020aa..3cd2050a33e6a 100644 --- a/mm/kmsan/kmsan.h +++ b/mm/kmsan/kmsan.h @@ -125,6 +125,8 @@ static __always_inline bool kmsan_in_runtime(void) { if ((hardirq_count() >> HARDIRQ_SHIFT) > 1) return true; + if (in_nmi()) + return true; return kmsan_get_context()->kmsan_in_runtime; } -- 2.38.1.273.g43a17bfeac-goog