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Message-ID: <20160914212442.GD57174@ast-mbp.thefacebook.com>
Date: Wed, 14 Sep 2016 14:24:43 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Mickaël Salaün <mic@...ikod.net>
Cc: linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
Andy Lutomirski <luto@...capital.net>,
Arnd Bergmann <arnd@...db.de>,
Casey Schaufler <casey@...aufler-ca.com>,
Daniel Borkmann <daniel@...earbox.net>,
Daniel Mack <daniel@...que.org>,
David Drysdale <drysdale@...gle.com>,
"David S . Miller" <davem@...emloft.net>,
Elena Reshetova <elena.reshetova@...el.com>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
James Morris <james.l.morris@...cle.com>,
Kees Cook <keescook@...omium.org>, Paul Moore <pmoore@...hat.com>,
Sargun Dhillon <sargun@...gun.me>,
"Serge E . Hallyn" <serge@...lyn.com>, Tejun Heo <tj@...nel.org>,
Will Drewry <wad@...omium.org>, kernel-hardening@...ts.openwall.com,
linux-api@...r.kernel.org, linux-security-module@...r.kernel.org,
netdev@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [RFC v3 22/22] samples/landlock: Add sandbox example
On Wed, Sep 14, 2016 at 09:24:15AM +0200, Mickaël Salaün wrote:
> Add a basic sandbox tool to create a process isolated from some part of
> the system. This can depend of the current cgroup.
>
> Example with the current process hierarchy (seccomp):
>
> $ ls /home
> user1
> $ LANDLOCK_ALLOWED='/bin:/lib:/usr:/tmp:/proc/self/fd/0' \
> ./samples/landlock/sandbox /bin/sh -i
> Launching a new sandboxed process.
> $ ls /home
> ls: cannot open directory '/home': Permission denied
>
> Example with a cgroup:
>
> $ mkdir /sys/fs/cgroup/sandboxed
> $ ls /home
> user1
> $ LANDLOCK_CGROUPS='/sys/fs/cgroup/sandboxed' \
> LANDLOCK_ALLOWED='/bin:/lib:/usr:/tmp:/proc/self/fd/0' \
> ./samples/landlock/sandbox
> Ready to sandbox with cgroups.
> $ ls /home
> user1
> $ echo $$ > /sys/fs/cgroup/sandboxed/cgroup.procs
> $ ls /home
> ls: cannot open directory '/home': Permission denied
>
> Changes since v2:
> * use BPF_PROG_ATTACH for cgroup handling
>
> Signed-off-by: Mickaël Salaün <mic@...ikod.net>
...
> + struct bpf_insn hook_path[] = {
> + /* specify an option, if any */
> + BPF_MOV32_IMM(BPF_REG_1, 0),
> + /* handles to compare with */
> + BPF_LD_MAP_FD(BPF_REG_2, map_fs),
> + BPF_MOV64_IMM(BPF_REG_3, BPF_MAP_ARRAY_OP_OR),
> + /* hook argument (struct file) */
> + BPF_LDX_MEM(BPF_DW, BPF_REG_4, BPF_REG_6, offsetof(struct
> + landlock_data, args[0])),
> + /* checker function */
> + BPF_EMIT_CALL(BPF_FUNC_landlock_cmp_fs_beneath_with_struct_file),
the example is sweet!
Since only that helper is used, could you skip the other one
from the patches (for now) ?
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