Date: Mon, 13 Dec 2021 23:53:51 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Gleb Popov <arrowd@freebsd.org>, Alan Somers <asomers@freebsd.org> Cc: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: What to use in place of abstract unix sockets? Message-ID: <91be3e0c-6c87-ef71-c54d-9049ab1ead84@grosbein.net> In-Reply-To: <CALH631mxFTXX-F-fosnwQxdjBnzKN6Fy_NzzUQ=rgQ2ADJPCfA@mail.gmail.com> References: <CALH631kYAz%2B_=p6VUhxzx0tz8eox804PCK5A9POxQkZTdThZCQ@mail.gmail.com> <F0BE714E-E25B-4A49-AA6E-B0E906374446@dons.net.au> <CALH631m8P_NG3nTZ1JQ2hhZMTrAMuuGjS8Ahz_qDMu1bFDCzkw@mail.gmail.com> <CAOtMX2ip78bYHHLmR0DC7mvy3yBkH0i74vtHQ=Lu-mFVLAtB=w@mail.gmail.com> <CALH631mxFTXX-F-fosnwQxdjBnzKN6Fy_NzzUQ=rgQ2ADJPCfA@mail.gmail.com>
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13.12.2021 21:24, Gleb Popov wrote: > On Sat, Dec 11, 2021 at 8:02 PM Alan Somers <asomers@freebsd.org> wrote: > >> Since socketpair() doesn't work in this case, why not just use a UDP >> socket bound to 127.0.0.1 ? >> > > This would introduce a bit of overhead as the packet would pass through the > IP stack. Another problem is that the current code uses SOCK_STREAM socket > type, which isn't supported by the UDP protocol. Maybe this would work with > SCTP? > Anyways, I'm going to try this only as a last resort. > > OK, so far my options are: > 1. Mount the directory containing UDS into chroot with nullfs. > 2. Use PF_INET. > 3. Do kernel-hacking and implement abstract sockets (as well as > remount-to-readonly support for nullfs). > > I'd go straight to #3 but with my skills/free time this would take a lot of > time, so I'm going to try hacking it around with #1 and #2. > > Thanks everyone for all the suggestions. Is'nt hacking "the client" to open AF_UNIX socket before chroot() an option?
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