[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20241022.Oov8ohRe4shu@digikod.net>
Date: Tue, 22 Oct 2024 20:50:03 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Matthieu Buffet <matthieu@...fet.re>
Cc: Günther Noack <gnoack@...gle.com>,
Konstantin Meskhidze <konstantin.meskhidze@...wei.com>, Ivanov Mikhail <ivanov.mikhail1@...wei-partners.com>,
linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org,
Tahera Fahimi <fahimitahera@...il.com>
Subject: Re: [PATCH v3 3/3] samples/landlock: Clarify option parsing behaviour
On Sat, Oct 19, 2024 at 05:15:34PM +0200, Matthieu Buffet wrote:
> Clarify the distinction between filesystem variables (mandatory)
> and all others (optional).
> For optional variables, explain the difference between unset variables
> (no access check performed) and empty variables (nothing allowed for
> lists of allowed paths/ports, or no effect for lists of scopes).
> List LL_SCOPED values understood and their effect.
>
> Signed-off-by: Matthieu Buffet <matthieu@...fet.re>
> ---
> samples/landlock/sandboxer.c | 29 +++++++++++++++--------------
> 1 file changed, 15 insertions(+), 14 deletions(-)
>
> diff --git a/samples/landlock/sandboxer.c b/samples/landlock/sandboxer.c
> index 38fc6ebd7222..96b451cf0531 100644
> --- a/samples/landlock/sandboxer.c
> +++ b/samples/landlock/sandboxer.c
> @@ -296,23 +296,24 @@ static bool check_ruleset_scope(const char *const env_var,
> /* clang-format off */
>
> static const char help[] =
> - "usage: "
> - ENV_FS_RO_NAME "=\"...\" "
> - ENV_FS_RW_NAME "=\"...\" "
> - ENV_TCP_BIND_NAME "=\"...\" "
> - ENV_TCP_CONNECT_NAME "=\"...\" "
> - ENV_SCOPED_NAME "=\"...\" %1$s <cmd> [args]...\n"
> + "usage: " ENV_FS_RO_NAME "=\"...\" " ENV_FS_RW_NAME "=\"...\" "
> + "[other environment variables] %1$s <cmd> [args]...\n"
> "\n"
> - "Execute a command in a restricted environment.\n"
> + "Execute the given command in a restricted environment.\n"
> + "Multi-valued settings (lists of ports, paths, scopes) are colon-delimited.\n"
> "\n"
> - "Environment variables containing paths and ports each separated by a colon:\n"
> - "* " ENV_FS_RO_NAME ": list of paths allowed to be used in a read-only way\n"
> - "* " ENV_FS_RW_NAME ": list of paths allowed to be used in a read-write way\n"
> + "Mandatory settings:\n"
> + "* " ENV_FS_RO_NAME ": paths allowed to be used in a read-only way\n"
> + "* " ENV_FS_RW_NAME ": paths allowed to be used in a read-write way\n"
> "\n"
> - "Environment variables containing ports are optional and could be skipped.\n"
> - "* " ENV_TCP_BIND_NAME ": list of ports allowed to bind (server)\n"
> - "* " ENV_TCP_CONNECT_NAME ": list of ports allowed to connect (client)\n"
> - "* " ENV_SCOPED_NAME ": list of scoped IPCs\n"
> + "Optional settings (when not set, their associated access check "
> + "is always allowed, which is different from an empty string which "
> + "means an empty list)\n"
I would just add ":" at the end of the line. No need to send another
patch for that.
> + "* " ENV_TCP_BIND_NAME ": ports allowed to bind (server)\n"
> + "* " ENV_TCP_CONNECT_NAME ": ports allowed to connect (client)\n"
> + "* " ENV_SCOPED_NAME ": actions denied on the outside of the landlock domain\n"
> + " - \"a\" to restrict opening abstract unix sockets\n"
> + " - \"s\" to restrict sending signals\n"
> "\n"
> "Example:\n"
> ENV_FS_RO_NAME "=\"${PATH}:/lib:/usr:/proc:/etc:/dev/urandom\" "
> --
> 2.39.5
>
>
Powered by blists - more mailing lists