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selftests/bpf: add a test for device cgroup controller
Add a test for device cgroup controller. The test loads a simple bpf program which logs all device access attempts using trace_printk() and forbids all operations except operations with /dev/zero and /dev/urandom. Then the test creates and joins a test cgroup, and attaches the bpf program to it. Then it tries to perform some simple device operations and checks the result: create /dev/null (should fail) create /dev/zero (should pass) copy data from /dev/urandom to /dev/zero (should pass) copy data from /dev/urandom to /dev/full (should fail) copy data from /dev/random to /dev/zero (should fail) Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Tejun Heo <tj@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -13,11 +13,11 @@ CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../i
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LDLIBS += -lcap -lelf
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TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
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test_align test_verifier_log
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test_align test_verifier_log test_dev_cgroup
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TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test_obj_id.o \
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test_pkt_md_access.o test_xdp_redirect.o test_xdp_meta.o sockmap_parse_prog.o \
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sockmap_verdict_prog.o
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sockmap_verdict_prog.o dev_cgroup.o
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TEST_PROGS := test_kmod.sh test_xdp_redirect.sh test_xdp_meta.sh
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60
tools/testing/selftests/bpf/dev_cgroup.c
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60
tools/testing/selftests/bpf/dev_cgroup.c
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@ -0,0 +1,60 @@
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/* Copyright (c) 2017 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <linux/bpf.h>
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#include <linux/version.h>
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#include "bpf_helpers.h"
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SEC("cgroup/dev")
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int bpf_prog1(struct bpf_cgroup_dev_ctx *ctx)
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{
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short type = ctx->access_type & 0xFFFF;
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#ifdef DEBUG
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short access = ctx->access_type >> 16;
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char fmt[] = " %d:%d \n";
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switch (type) {
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case BPF_DEVCG_DEV_BLOCK:
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fmt[0] = 'b';
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break;
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case BPF_DEVCG_DEV_CHAR:
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fmt[0] = 'c';
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break;
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default:
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fmt[0] = '?';
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break;
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}
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if (access & BPF_DEVCG_ACC_READ)
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fmt[8] = 'r';
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if (access & BPF_DEVCG_ACC_WRITE)
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fmt[9] = 'w';
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if (access & BPF_DEVCG_ACC_MKNOD)
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fmt[10] = 'm';
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bpf_trace_printk(fmt, sizeof(fmt), ctx->major, ctx->minor);
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#endif
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/* Allow access to /dev/zero and /dev/random.
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* Forbid everything else.
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*/
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if (ctx->major != 1 || type != BPF_DEVCG_DEV_CHAR)
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return 0;
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switch (ctx->minor) {
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case 5: /* 1:5 /dev/zero */
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case 9: /* 1:9 /dev/urandom */
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return 1;
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}
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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__u32 _version SEC("version") = LINUX_VERSION_CODE;
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93
tools/testing/selftests/bpf/test_dev_cgroup.c
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93
tools/testing/selftests/bpf/test_dev_cgroup.c
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@ -0,0 +1,93 @@
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/* Copyright (c) 2017 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <linux/bpf.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "cgroup_helpers.h"
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#define DEV_CGROUP_PROG "./dev_cgroup.o"
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#define TEST_CGROUP "test-bpf-based-device-cgroup/"
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int main(int argc, char **argv)
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{
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struct bpf_object *obj;
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int error = EXIT_FAILURE;
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int prog_fd, cgroup_fd;
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__u32 prog_cnt;
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if (bpf_prog_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE,
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&obj, &prog_fd)) {
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printf("Failed to load DEV_CGROUP program\n");
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goto err;
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}
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if (setup_cgroup_environment()) {
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printf("Failed to load DEV_CGROUP program\n");
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goto err;
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}
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/* Create a cgroup, get fd, and join it */
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cgroup_fd = create_and_get_cgroup(TEST_CGROUP);
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if (!cgroup_fd) {
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printf("Failed to create test cgroup\n");
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goto err;
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}
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if (join_cgroup(TEST_CGROUP)) {
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printf("Failed to join cgroup\n");
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goto err;
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}
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/* Attach bpf program */
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if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_DEVICE, 0)) {
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printf("Failed to attach DEV_CGROUP program");
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goto err;
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}
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if (bpf_prog_query(cgroup_fd, BPF_CGROUP_DEVICE, 0, NULL, NULL,
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&prog_cnt)) {
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printf("Failed to query attached programs");
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goto err;
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}
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/* All operations with /dev/zero and and /dev/urandom are allowed,
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* everything else is forbidden.
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*/
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assert(system("rm -f /tmp/test_dev_cgroup_null") == 0);
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assert(system("mknod /tmp/test_dev_cgroup_null c 1 3"));
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assert(system("rm -f /tmp/test_dev_cgroup_null") == 0);
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/* /dev/zero is whitelisted */
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assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0);
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assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5") == 0);
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assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0);
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assert(system("dd if=/dev/urandom of=/dev/zero count=64") == 0);
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/* src is allowed, target is forbidden */
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assert(system("dd if=/dev/urandom of=/dev/full count=64"));
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/* src is forbidden, target is allowed */
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assert(system("dd if=/dev/random of=/dev/zero count=64"));
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error = 0;
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printf("test_dev_cgroup:PASS\n");
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err:
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cleanup_cgroup_environment();
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return error;
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}
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