Date: Wed, 2 Jul 2025 21:54:45 +0000 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: Rick Macklem <rick.macklem@gmail.com> Cc: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: RFC: checking file systems support UF_HIDDEN, UF_SYSTEM Message-ID: <rzhddesedhkibeq2mzcpgqaw2y3guallutuq7a4uzpxa6fgqh4@4yyon25myif7> In-Reply-To: <CAM5tNy5Cm=YhUkhXsA=O5ha-om7h5MQk3_SuLFjgZX_EA5ShkA@mail.gmail.com> References: <CAM5tNy5eoY5f-fo9BKc4v34XKXF6%2B6Ae7Zpq=FH7owaSRYSHmw@mail.gmail.com> <5emcw3uocuaenm2lwdrqqvxgiqpo7uazon6y2hzelhi5qjxxj4@trymutqekdiy> <CAM5tNy5Cm=YhUkhXsA=O5ha-om7h5MQk3_SuLFjgZX_EA5ShkA@mail.gmail.com>
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[-- Attachment #1 --] On Wed, Jul 02, 2025 at 02:45:58PM -0700, Rick Macklem wrote: > On Wed, Jul 2, 2025 at 2:05 PM Shawn Webb <shawn.webb@hardenedbsd.org> wrote: > > > > On Wed, Jul 02, 2025 at 02:02:14PM -0700, Rick Macklem wrote: > > > Hi, > > > > > > I am implementing the "hidden" and "system" attributes for > > > NFSv4 using UF_HIDDEN and UF_SYSTEM. > > > > > > In a couple of places in the code, I need to know if a file > > > system supports these flags. > > > I can think of two ways to do this. > > > #1 - Create a new VFCF_HIDSYS flag that is set via VFS_SET() > > > for file systems that support the UF_HIDDEN and UF_SYSTEM > > > flags and test for that flag being set. > > > or > > > #2 - Write it this way... > > > if (strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") != 0 || > > > strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") != 0 || > > > strcmp(vp->v_mount->mnt_vfc->vfc_name, "msdosfs") != 0 || > > > strcmp(vp->v_mount->mnt_vfc->vfc_name, "tmpfs") != 0) > > > > > > Which do you think is preferable (or do you have another idea)? > > > > I have no skin in the game, but I'm curious if you could tell me more > > about UF_HIDDEN. Can you explain what that is or perhaps link me to > > some documentation for me to read? > I don't know why or when these were added to FreeBSD, but I believe > their origin is in MSDOS long ago. The fat file system had these two flags > that MSDOS used, called "hiiden" and "system". > I believe "hidden" is somewhat similar to POSIX file > names that start with "." and "system" made the file harder to delete. > (But, I hate to admit I even recall anything about MSDOS;-) > > If you google "windows system and hidden" you'll get something that > might answer your question, thanks to their AI. > > W.r.t. NFSv4, the current interest is from the group that is working > on the Windows NFSv4.1 client. That explains a lot. Thanks for the explanation! -- Shawn Webb Cofounder / Security Engineer HardenedBSD Signal Username: shawn_webb.74 Tor-ified Signal: +1 303-901-1600 / shawn_webb_opsec.50 https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEA6TL67gupaZ9nzhT/y5nonf44foFAmhlqp4ACgkQ/y5nonf4 4foo5g/9FrXyHQTjkmr6KFw8y6vj8mQzjzsh6bcfLVBSf5FNOlhVB40Pgb/Upy6C qTMYXIUPRE5i0mHGG+zJ4OtEkT06XCvC9ozA1mU+yd0ireMf1UM+scjmYRJt6S/j CmnZL4Vn76ZJaQXSVvIK4E7de3bMdOEgBPjyhBRH72bIHIqkyBq27uDh05HNLev2 7T3NlEbpAWeViiKRP6PnVO5IBwgh0KCbvA/Izwhlem1E+lfP8jajsSEuQv7CyllF gktI9sPBgQAmtPTp/Pa9/80/P9A0yn9TWX3eq3CvWQLIVmHRISVEo0zKsWCYpGdv HJbyvJSjpYzncL8xq5eBr3N9i3onPK+cUyelPk14kq3p/GHG+LlelJjtBwUHSXbT 4/UoWOh/nxUQnqWsa6B+hY6zshHpzvAlHx65GmztHu7dUaManfa0xAmUDsqdMX73 jHtAGEYXh+BL0AqEbM0+js/mjyYqtwQCEAzEiytsDDwF/suKN3Ol3r/upr9u6pLl RzUFE32Yvp5qdQJESQGYbPlTb0Svu8kxWRLewYzJJ4BS7bqtzBLnZ58py90J4PM3 ByYUILL3fK/ryQgJI2IYuAS9OlqlwQKMBwwV1/S8DV7ung4Nl/LXuYiw8qiGhd2l XS/w+q2n47UOqWTizn09TSQm/qTz/DbE/S/ofqw4u8OlFmtGx4M= =LxQw -----END PGP SIGNATURE-----home | help
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