From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from hr2.samba.org (hr2.samba.org [144.76.82.148]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 476A554BF4; Tue, 23 Apr 2024 10:58:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=144.76.82.148 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713869913; cv=none; b=BgV10Osqx5Num1WT5IakzsTOAzku5s6hynLuylIB1hq/WP2z31ZiNcrF4r3HYOGqEP5NXzsvxe2HhGQlwH4JY+B78HgcNzMduN5OS1DASe3iBRIe2FTkUAPlBltXjPyM05AgB0/plEdmUvQoQ93x18Kaxy7wgNnkXThVN+ZDLno= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713869913; c=relaxed/simple; bh=Rncnh7ZhSNEX3awwKWopqVkmtLCPXwdQ6MAPyaR9g2M=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Wi7u0WBxAmasqD+RZixo4qGFpX95RfIP0gxGYrVSVI1uCEX6oUE63oWjyFnuP9zrurFzoqJSA6OWub8BzBTvUthUIEUJ4AILadJhJRkpLtCUjuVPbrJOLjpnfhoEJ8NRKGgeMpD7V7YvyZltT5RjzE/zG5P5XpZnm9lNrSoPRsQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=samba.org; spf=pass smtp.mailfrom=samba.org; dkim=pass (3072-bit key) header.d=samba.org header.i=@samba.org header.b=rFw7Pipw; arc=none smtp.client-ip=144.76.82.148 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=samba.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samba.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (3072-bit key) header.d=samba.org header.i=@samba.org header.b="rFw7Pipw" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=samba.org; s=42; h=From:Cc:To:Date:Message-ID; bh=mMx9swMS61DtwxCxz+rf6ZcLr+qj4g5NB1qqBI2FYfc=; b=rFw7PipwGvsozchJmgVbvLmwLX T83Y5OkcdFKR4FJHKj56blal67tnqCnik8k35+v2kHBp0mzfi2qMECEyENSet0FEu1aFpwu+cl/LG fPBBK4GSSNe9eDP3vASmXSLSeA7KYdo5kqLOtFqdzHHtv0KmraBLLFHgKBycdVGEcTdV1JtaU1nN4 IvWgsuLHHW2GhMqXFwsCsX0pNdOpuyIsIVyWfZwM+TQTfvb5ZjsAXppVYW23l6cSCi1wRkCx3XR1u GupEZJjsCF196wdsRb2ThDds7YZ+s2hI6sZF021tr0F/kr04yEHRdj+Y3e7F16N3pxSXNPYahvxKi 07ToC/Tp0dgFsIZonBoacMZf4pHVkeVF5gnyDsAHbO+Zn4lU3SrcR2JUkAY22HFacy8Dyxc4iQwRx WZMtsxN7R91oFswL1VrHHITEbGEJA0rAlVrUt0/+HcHAHyRWPPrIs2AgHSCnyW0plLJmM8+4/EmDy Td+OA5fHOLJmYeOKW+4gA6Ej; Received: from [127.0.0.2] (localhost [127.0.0.1]) by hr2.samba.org with esmtpsa (TLS1.3:ECDHE_SECP256R1__ECDSA_SECP256R1_SHA256__CHACHA20_POLY1305:256) (Exim) id 1rzDr0-007rgx-0R; Tue, 23 Apr 2024 10:58:26 +0000 Message-ID: Date: Tue, 23 Apr 2024 12:58:25 +0200 Precedence: bulk X-Mailing-List: linux-api@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/2] implement OA2_INHERIT_CRED flag for openat2() To: Stas Sergeev , linux-kernel@vger.kernel.org Cc: Eric Biederman , Alexander Viro , Andy Lutomirski , Christian Brauner , Jan Kara , Jeff Layton , Chuck Lever , Alexander Aring , linux-fsdevel@vger.kernel.org, Paolo Bonzini , =?UTF-8?Q?Christian_G=C3=B6ttsche?= , Linux API Mailing List References: <20240423104824.10464-1-stsp2@yandex.ru> Content-Language: en-US, de-DE From: Stefan Metzmacher In-Reply-To: <20240423104824.10464-1-stsp2@yandex.ru> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Am 23.04.24 um 12:48 schrieb Stas Sergeev: > This patch-set implements the OA2_INHERIT_CRED flag for openat2() syscall. > It is needed to perform an open operation with the creds that were in > effect when the dir_fd was opened. This allows the process to pre-open > some dirs and switch eUID (and other UIDs/GIDs) to the less-privileged > user, while still retaining the possibility to open/create files within > the pre-opened directory set. > > Changes in v2: > - capture full struct cred instead of just fsuid/fsgid. > Suggested by Stefan Metzmacher > > CC: Stefan Metzmacher > CC: Eric Biederman > CC: Alexander Viro > CC: Andy Lutomirski > CC: Christian Brauner > CC: Jan Kara > CC: Jeff Layton > CC: Chuck Lever > CC: Alexander Aring > CC: linux-fsdevel@vger.kernel.org > CC: linux-kernel@vger.kernel.org I guess this is something that should cc linux-api@vger.kernel.org ... metze