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SubjectRe: [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@digikod.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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