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[49.199.129.238]) by smtp.gmail.com with ESMTPSA id s195-v6sm16661204pgs.76.2018.09.29.21.44.16 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 29 Sep 2018 21:44:21 -0700 (PDT) Date: Sun, 30 Sep 2018 14:44:11 +1000 From: Aleksa Sarai To: Christian Brauner Cc: Jeff Layton , "J. Bruce Fields" , Al Viro , Arnd Bergmann , Shuah Khan , David Howells , Andy Lutomirski , Eric Biederman , Tycho Andersen , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, dev@opencontainers.org, containers@lists.linux-foundation.org Subject: Re: [PATCH 0/3] namei: implement various scoping AT_* flags Message-ID: <20180930044411.orcuw7xok4szqzzo@ryuk> References: <20180929103453.12025-1-cyphar@cyphar.com> <20180929143814.yfo6rud7dkyb5ip4@brauner.io> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="olyw2qotbhbwue5q" Content-Disposition: inline In-Reply-To: <20180929143814.yfo6rud7dkyb5ip4@brauner.io> User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --olyw2qotbhbwue5q Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2018-09-29, Christian Brauner wrote: > > Currently I've only enabled these for openat(2) and the stat(2) family. > > I would hope we could enable it for basically every *at(2) syscall -- > > but many of them appear to not have a @flags argument and thus we'll > > need to add several new syscalls to do this. I'm more than happy to send > > those patches, but I'd prefer to know that this preliminary work is > > acceptable before doing a bunch of copy-paste to add new sets of *at(2) > > syscalls. >=20 > We should really make sure that we can't make due with openat() alone > before adding a bunch of new syscalls. So there's no need to rush into > this. :) Yeah, I think that we could (mostly) make do with openat(2). We might need to have renameat(2) and a few others, but if we had more support for AT_EMPTY_PATH you should be able to just O_PATH|O_{BENEATH,XDEV,...} and then operate on the O_PATH fd. --=20 Aleksa Sarai Senior Software Engineer (Containers) SUSE Linux GmbH --olyw2qotbhbwue5q Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEXzbGxhtUYBJKdfWmnhiqJn3bjbQFAluwVJsACgkQnhiqJn3b jbR0AA//VbHHrVwS/hgpTdN1okuZDNZ5MgjStZWgSjTWaEpyL8G2YwAmKes3x5MS nfvOGCx32EeDIXhcjNzSjkDQIMGRHNwPTTqzymFzY/OmVgYj1ECdDrpQrFtF3msM 501KZ507tvbJti4hZq0EZF6Jbq3py+fXzGqpCWGBv4VWoPsHPt+/KoTf6enleZQJ 6hiM4anCKveDNTE+BQ20fsTbs1V0x7A9ykVq2hNQECmiWJvOHgUdzddBIdOM95Vb 13k7G3Wf/YcaS2kp1cUVtLcfFocqKGPLcuPrdXAjkekfYth0KwDX0ViBKt5LbUKb l4XpiFZ0MlFOY04zdIGRYGyP8s6Vse/GpdukmnSTL68ALRDR5/4G5okrbSILmvFh YJr+QF+b/H+yg51LdYi/o2YZqcwPrYJAdUzbWvxz68nLA3YdOeXCEOvES/q8ebDZ 03Rt7v1UhTSg2QdZvax4MAdlhUe2IJKw0/vC18uyCqwTPRpE+yxM7Ux2P1RpMp2t eDC6zH7sGdAN7iGewJqEWmD+EE6FYlaP0Fd1IjNgg6qeETprfNzk5orJPzwxvMdu zGrxuAGmagi+6t18ZSKq7Gsaq8ZpZ1wXfgaC5cRzDEQigy1s105NepC0/wbBhVFU 5g7ykyPiCuOSN+E4ifsbWCUUemKUNb8FmZwx1XIArYE5UDbY9Q0= =oJlG -----END PGP SIGNATURE----- --olyw2qotbhbwue5q--