From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/3488 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: Use of size_t and ssize_t in mseek Date: Sat, 29 Jun 2013 16:56:42 +0200 Message-ID: <1372517802.8324.13.camel@eris.loria.fr> References: <20130627042314.GW29800@brightrain.aerifal.cx> <51CBC034.7030001@nicta.com.au> <20130627153429.GZ29800@brightrain.aerifal.cx> <51CCDDA5.5050503@nicta.com.au> <20130628012209.GD29800@brightrain.aerifal.cx> <51CCE81F.4000403@nicta.com.au> <20130628014815.GE29800@brightrain.aerifal.cx> <51CCED3F.3080303@nicta.com.au> <20130629041316.GG29800@brightrain.aerifal.cx> <51CEE341.9000409@nicta.com.au> <20130629141736.GH29800@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-TiIQFmFl8fGTVwOZYs1o" 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.2.3-0ubuntu6 Xref: news.gmane.org gmane.linux.lib.musl.general:3488 Archived-At: --=-TiIQFmFl8fGTVwOZYs1o Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Samstag, den 29.06.2013, 10:17 -0400 schrieb Rich Felker: > Just that this is one of a multitude of places that such a check could > be made, and I question the value of doing it in one place but not > others. Examples include snprintf, strnlen, memchr, and basically any > interface that takes a size_t representing the size of an already > existing object. I'm against adding checks to all these places since > it adds bloat and potentially hurts performance and for most of them > there's nothing they could do except crash if the check failed. So > what I'm questioning is the value of adding such a check to the one > interface you ran into trouble with, when there are plenty more widely > used functions that won't be checked; this inconsistency does not make > sense to me. I'd like to hear what others think, though. I think C11 has indentified this sort of specification problems and therefore introduces rsize_t and RSIZE_MAX in the not-loved-by-many appendix K "bounds-checking intefaces". Interfaces that are specified with this type are required to check that the value isn't too large for any object. If you'd want to go that road (of checking for the size) I'd suggest that you'd define and use RSIZE_MAX for such a thing, and maybe even change the interfaces to use rsize_t. Since this is only a typedef such a change should still be compatible with size_t as in the current and future standard(s), and it would clearly mark the intent of bounds checking. Jens --=20 :: INRIA Nancy Grand Est :: http://www.loria.fr/~gustedt/ :: :: AlGorille ::::::::::::::: office Nancy : +33 383593090 :: :: ICube :::::::::::::: office Strasbourg : +33 368854536 :: :: ::::::::::::::::::::::::::: gsm France : +33 651400183 :: :: :::::::::::::::::::: gsm international : +49 15737185122 :: --=-TiIQFmFl8fGTVwOZYs1o Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlHO9aoACgkQD9PoadrVN+Kv/gCePaZtL+1PLpdYuuTjj85To3ci S3sAnjydPOhJUJvyA2aT9683D0b0Nx+L =VhvA -----END PGP SIGNATURE----- --=-TiIQFmFl8fGTVwOZYs1o--