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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 BEF34C433F5 for ; Mon, 6 Sep 2021 13:05:54 +0000 (UTC) Received: from picard.linux.it (picard.linux.it [213.254.12.146]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2AD9E60C51 for ; Mon, 6 Sep 2021 13:05:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2AD9E60C51 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux.it Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id 58F963C9527 for ; Mon, 6 Sep 2021 15:05:52 +0200 (CEST) Received: from in-2.smtp.seeweb.it (in-2.smtp.seeweb.it [IPv6:2001:4b78:1:20::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 302773C2601 for ; Mon, 6 Sep 2021 15:05:42 +0200 (CEST) Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by in-2.smtp.seeweb.it (Postfix) with ESMTPS id 87680600A60 for ; Mon, 6 Sep 2021 15:05:42 +0200 (CEST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id ED70B1FEF9; Mon, 6 Sep 2021 13:05:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1630933541; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=F3DCrpHQLRPsRb/DbA44wCZRWIXTFGdc4di4NZ4Rr0M=; b=Z2nOBNre4lY+hD1K29mkaojY4R/nvpkfsH1QT5BS3lBE/nU6gVbpx7pNpLozZWsivAVtNo zrsWnKrHgSImIOSnvZmreq3YLc8bUYt7ZYEBTfTZEhKvEkvfL0oZORrVeiZQtzsLST1Pn2 20PqU/KYYCGqi3JtW2oEiAvB9W31QtQ= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1630933541; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=F3DCrpHQLRPsRb/DbA44wCZRWIXTFGdc4di4NZ4Rr0M=; b=i8bP6lo5hmKG0BD7GnjMG/k6NhUXAWFlb4R6GX7Tfv7wOYkMPmQ2Zw2efmEo503NDN3FQ0 1/EG2ZHSupDx1SAA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id DAC9113B50; Mon, 6 Sep 2021 13:05:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id jfHoMyUSNmHaRQAAMHmgww (envelope-from ); Mon, 06 Sep 2021 13:05:41 +0000 Date: Mon, 6 Sep 2021 15:05:52 +0200 From: Cyril Hrubis To: Martin Doucha Message-ID: References: <20210903154848.18705-1-mdoucha@suse.cz> <20210903154848.18705-5-mdoucha@suse.cz> <77fd98d9-5257-c1da-a01b-77d8cc1b6bce@suse.cz> <2ce3b46e-b503-a44d-8c16-819e587e217a@suse.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <2ce3b46e-b503-a44d-8c16-819e587e217a@suse.cz> X-Virus-Scanned: clamav-milter 0.102.4 at in-2.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH 4/7] syscalls/kill05: Use any two unprivileged users X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ltp@lists.linux.it Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Message-ID: <20210906130552.nAnn4Yf8DINgy9M70jPbO467wqf5SxgJXDPrye4Qkj4@z> Hi! > But setting a non-existent UID/GID on a running process is different > because the kernel might try to look up some additional data in the > user/group database and block the credentials change if the lookup fails. No it will not, kernel does not care and never cared about system users and groups, that's purely userspace concept. The login(1) process that sets up all the process IDS as well as shell variables. -- Cyril Hrubis chrubis@suse.cz -- Mailing list info: https://lists.linux.it/listinfo/ltp