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Message-ID: <20230522131252.4f9959d3@kernel.org> Date: Mon, 22 May 2023 13:12:52 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Simon Horman <simon.horman@...igine.com> Cc: Christian Brauner <brauner@...nel.org>, kernel test robot <lkp@...el.com>, Eric Dumazet <edumazet@...gle.com>, Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>, davem@...emloft.net, oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>, Leon Romanovsky <leon@...nel.org>, David Ahern <dsahern@...nel.org>, Arnd Bergmann <arnd@...db.de>, Kees Cook <keescook@...omium.org>, Kuniyuki Iwashima <kuniyu@...zon.com>, Lennart Poettering <mzxreary@...inter.de>, Luca Boccassi <bluca@...ian.org>, linux-arch@...r.kernel.org Subject: Re: [PATCH net-next v5 1/3] scm: add SO_PASSPIDFD and SCM_PIDFD On Mon, 22 May 2023 15:19:17 +0200 Simon Horman wrote: > > TLI, that AF_UNIX can be a kernel module... > > I'm really not excited in exposing pidfd_prepare() to non-core kernel > > code. Would it be possible to please simply refuse SO_PEERPIDFD and > > SCM_PIDFD if AF_UNIX is compiled as a module? I feel that this must be > > super rare because it risks breaking even simplistic userspace. > > It occurs to me that it may be simpler to not allow AF_UNIX to be a module. > But perhaps that breaks something for someone... Both of the two options (disable the feature with unix=m, make unix bool) could lead to breakage, I reckon at least the latter makes the breakage more obvious? So not allowing AF_UNIX as a module gets my vote as well. A mechanism of exporting symbols for core/internal use only would find a lot of use in networking :(
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