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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 130BDC433E3 for ; Sat, 20 Mar 2021 15:39:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDD0A6196B for ; Sat, 20 Mar 2021 15:39:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229990AbhCTPiy (ORCPT ); Sat, 20 Mar 2021 11:38:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229846AbhCTPil (ORCPT ); Sat, 20 Mar 2021 11:38:41 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6DDFCC061574 for ; Sat, 20 Mar 2021 08:38:41 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id o2so4362042plg.1 for ; Sat, 20 Mar 2021 08:38:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=LiWBiutEzHZpuPBq9uETfF28MNV9/guoTvL4IvciDO8=; b=SYbOAxT1ly1Ah0IboGGB/F1AtqqKBgS32+flAGu3xorlNvtNwZa6Ma1q30iN4yjJeX z7BO0afIYzd1YCQ+Emy6r6vXzx5DMG5CIOuGirTZykC0TMCw9hX0sA2aZet5kOhL6xZx b6/lLUfGDQR4EzbpEzhDWjAot7T3/sAw8qPupjnawR/GED6YJ3q/RYYSL6FTUsVTBjZd bWHj5NcDp2v6zKAyfnCyB0l1fnNGWARHCeyV/Vslk/sIMSuDZpRuwC1IOLm7VhL/RNDd 0NqmpcSvITDHaBY05c0C5fSjmpJoUmdoI2LUbrFoEy18AFBTvXyAVkhL0X9SETY3AHEc FO1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=LiWBiutEzHZpuPBq9uETfF28MNV9/guoTvL4IvciDO8=; b=CS9p1dlb9B60awJGgqcXnUH1C9tcKYEsKRGJaNosZmJI0t6FAsyf9QbIgtADrfyEi+ DP/mPzcA6Aj1K+pOHNRdaPo+B8KfmEAOLQiloZzjkAGAQ+yVWUKU/tc/9YvwuHc8Mkvj PMavsf6ZQuuHUDy9ycbe4ZGxklI3ebMAZvgqaYpfantsF4FESX1IjE+aOamDBMd/acue Lpz8xhzefAOYI16wqrf5YEKM+AOi1ptnGwvDG7poIrUccIVENSJoEyd0uZpEp06q/4z/ QhnIVk/Di9d4Jrqr8NrBcWXgekaKStAGffl18PviOfSXrmKGl+IyiM2Drw6bUq8hSn0t MPmw== X-Gm-Message-State: AOAM532dH9r9HhVj/ToEoouOQ5YjIA7KGLdqs1LIJOcZ9rZTsKOey49+ oHumtnYb+PtdL0W1SHf6fkv7LQ== X-Google-Smtp-Source: ABdhPJwGN92UbBSXE9WuCydfYARwv4uZ/Ya2yJvBBfUokhMeamR2YNMehKC4U4M3jlAZIqh5XXrg8g== X-Received: by 2002:a17:90a:bb91:: with SMTP id v17mr4053318pjr.24.1616254720897; Sat, 20 Mar 2021 08:38:40 -0700 (PDT) Received: from localhost.localdomain ([66.219.217.173]) by smtp.gmail.com with ESMTPSA id 2sm8658753pfi.116.2021.03.20.08.38.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Mar 2021 08:38:40 -0700 (PDT) From: Jens Axboe To: io-uring@vger.kernel.org Cc: torvalds@linux-foundation.org, ebiederm@xmission.com, linux-kernel@vger.kernel.org, oleg@redhat.com, Jens Axboe , Stefan Metzmacher Subject: [PATCH 1/2] signal: don't allow sending any signals to PF_IO_WORKER threads Date: Sat, 20 Mar 2021 09:38:31 -0600 Message-Id: <20210320153832.1033687-2-axboe@kernel.dk> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210320153832.1033687-1-axboe@kernel.dk> References: <20210320153832.1033687-1-axboe@kernel.dk> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org They don't take signals individually, and even if they share signals with the parent task, don't allow them to be delivered through the worker thread. Reported-by: Stefan Metzmacher Signed-off-by: Jens Axboe --- kernel/signal.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/signal.c b/kernel/signal.c index ba4d1ef39a9e..730ecd3d6faf 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -833,6 +833,9 @@ static int check_kill_permission(int sig, struct kernel_siginfo *info, if (!valid_signal(sig)) return -EINVAL; + /* PF_IO_WORKER threads don't take any signals */ + if (t->flags & PF_IO_WORKER) + return -EPERM; if (!si_fromuser(info)) return 0; -- 2.31.0