diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/token.c')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/token.c | 120 |
1 files changed, 110 insertions, 10 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/token.c b/tools/testing/selftests/bpf/prog_tests/token.c index fc4a175d8d76..f9392df23f8a 100644 --- a/tools/testing/selftests/bpf/prog_tests/token.c +++ b/tools/testing/selftests/bpf/prog_tests/token.c @@ -19,6 +19,7 @@ #include "priv_prog.skel.h" #include "dummy_st_ops_success.skel.h" #include "token_lsm.skel.h" +#include "priv_freplace_prog.skel.h" static inline int sys_mount(const char *dev_name, const char *dir_name, const char *type, unsigned long flags, @@ -788,6 +789,84 @@ static int userns_obj_priv_prog(int mnt_fd, struct token_lsm *lsm_skel) return 0; } +static int userns_obj_priv_freplace_setup(int mnt_fd, struct priv_freplace_prog **fr_skel, + struct priv_prog **skel, int *tgt_fd) +{ + LIBBPF_OPTS(bpf_object_open_opts, opts); + int err; + char buf[256]; + + /* use bpf_token_path to provide BPF FS path */ + snprintf(buf, sizeof(buf), "/proc/self/fd/%d", mnt_fd); + opts.bpf_token_path = buf; + *skel = priv_prog__open_opts(&opts); + if (!ASSERT_OK_PTR(*skel, "priv_prog__open_opts")) + return -EINVAL; + err = priv_prog__load(*skel); + if (!ASSERT_OK(err, "priv_prog__load")) + return -EINVAL; + + *fr_skel = priv_freplace_prog__open_opts(&opts); + if (!ASSERT_OK_PTR(*skel, "priv_freplace_prog__open_opts")) + return -EINVAL; + + *tgt_fd = bpf_program__fd((*skel)->progs.xdp_prog1); + return 0; +} + +/* Verify that freplace works from user namespace, because bpf token is loaded + * in bpf_object__prepare + */ +static int userns_obj_priv_freplace_prog(int mnt_fd, struct token_lsm *lsm_skel) +{ + struct priv_freplace_prog *fr_skel = NULL; + struct priv_prog *skel = NULL; + int err, tgt_fd; + + err = userns_obj_priv_freplace_setup(mnt_fd, &fr_skel, &skel, &tgt_fd); + if (!ASSERT_OK(err, "setup")) + goto out; + + err = bpf_object__prepare(fr_skel->obj); + if (!ASSERT_OK(err, "freplace__prepare")) + goto out; + + err = bpf_program__set_attach_target(fr_skel->progs.new_xdp_prog2, tgt_fd, "xdp_prog1"); + if (!ASSERT_OK(err, "set_attach_target")) + goto out; + + err = priv_freplace_prog__load(fr_skel); + ASSERT_OK(err, "priv_freplace_prog__load"); + +out: + priv_freplace_prog__destroy(fr_skel); + priv_prog__destroy(skel); + return err; +} + +/* Verify that replace fails to set attach target from user namespace without bpf token */ +static int userns_obj_priv_freplace_prog_fail(int mnt_fd, struct token_lsm *lsm_skel) +{ + struct priv_freplace_prog *fr_skel = NULL; + struct priv_prog *skel = NULL; + int err, tgt_fd; + + err = userns_obj_priv_freplace_setup(mnt_fd, &fr_skel, &skel, &tgt_fd); + if (!ASSERT_OK(err, "setup")) + goto out; + + err = bpf_program__set_attach_target(fr_skel->progs.new_xdp_prog2, tgt_fd, "xdp_prog1"); + if (ASSERT_ERR(err, "attach fails")) + err = 0; + else + err = -EINVAL; + +out: + priv_freplace_prog__destroy(fr_skel); + priv_prog__destroy(skel); + return err; +} + /* this test is called with BPF FS that doesn't delegate BPF_BTF_LOAD command, * which should cause struct_ops application to fail, as BTF won't be uploaded * into the kernel, even if STRUCT_OPS programs themselves are allowed @@ -828,8 +907,12 @@ static int userns_obj_priv_btf_success(int mnt_fd, struct token_lsm *lsm_skel) return validate_struct_ops_load(mnt_fd, true /* should succeed */); } +static const char *token_bpffs_custom_dir() +{ + return getenv("BPF_SELFTESTS_BPF_TOKEN_DIR") ?: "/tmp/bpf-token-fs"; +} + #define TOKEN_ENVVAR "LIBBPF_BPF_TOKEN_PATH" -#define TOKEN_BPFFS_CUSTOM "/bpf-token-fs" static int userns_obj_priv_implicit_token(int mnt_fd, struct token_lsm *lsm_skel) { @@ -867,7 +950,7 @@ static int userns_obj_priv_implicit_token(int mnt_fd, struct token_lsm *lsm_skel } unsetenv(TOKEN_ENVVAR); - /* now the same struct_ops skeleton should succeed thanks to libppf + /* now the same struct_ops skeleton should succeed thanks to libbpf * creating BPF token from /sys/fs/bpf mount point */ skel = dummy_st_ops_success__open_and_load(); @@ -892,6 +975,7 @@ static int userns_obj_priv_implicit_token(int mnt_fd, struct token_lsm *lsm_skel static int userns_obj_priv_implicit_token_envvar(int mnt_fd, struct token_lsm *lsm_skel) { + const char *custom_dir = token_bpffs_custom_dir(); LIBBPF_OPTS(bpf_object_open_opts, opts); struct dummy_st_ops_success *skel; int err; @@ -909,10 +993,10 @@ static int userns_obj_priv_implicit_token_envvar(int mnt_fd, struct token_lsm *l * BPF token implicitly, unless pointed to it through * LIBBPF_BPF_TOKEN_PATH envvar */ - rmdir(TOKEN_BPFFS_CUSTOM); - if (!ASSERT_OK(mkdir(TOKEN_BPFFS_CUSTOM, 0777), "mkdir_bpffs_custom")) + rmdir(custom_dir); + if (!ASSERT_OK(mkdir(custom_dir, 0777), "mkdir_bpffs_custom")) goto err_out; - err = sys_move_mount(mnt_fd, "", AT_FDCWD, TOKEN_BPFFS_CUSTOM, MOVE_MOUNT_F_EMPTY_PATH); + err = sys_move_mount(mnt_fd, "", AT_FDCWD, custom_dir, MOVE_MOUNT_F_EMPTY_PATH); if (!ASSERT_OK(err, "move_mount_bpffs")) goto err_out; @@ -925,11 +1009,11 @@ static int userns_obj_priv_implicit_token_envvar(int mnt_fd, struct token_lsm *l goto err_out; } - err = setenv(TOKEN_ENVVAR, TOKEN_BPFFS_CUSTOM, 1 /*overwrite*/); + err = setenv(TOKEN_ENVVAR, custom_dir, 1 /*overwrite*/); if (!ASSERT_OK(err, "setenv_token_path")) goto err_out; - /* now the same struct_ops skeleton should succeed thanks to libppf + /* now the same struct_ops skeleton should succeed thanks to libbpf * creating BPF token from custom mount point */ skel = dummy_st_ops_success__open_and_load(); @@ -951,11 +1035,11 @@ static int userns_obj_priv_implicit_token_envvar(int mnt_fd, struct token_lsm *l if (!ASSERT_ERR(err, "obj_empty_token_path_load")) goto err_out; - rmdir(TOKEN_BPFFS_CUSTOM); + rmdir(custom_dir); unsetenv(TOKEN_ENVVAR); return 0; err_out: - rmdir(TOKEN_BPFFS_CUSTOM); + rmdir(custom_dir); unsetenv(TOKEN_ENVVAR); return -EINVAL; } @@ -999,12 +1083,28 @@ void test_token(void) if (test__start_subtest("obj_priv_prog")) { struct bpffs_opts opts = { .cmds = bit(BPF_PROG_LOAD), - .progs = bit(BPF_PROG_TYPE_KPROBE), + .progs = bit(BPF_PROG_TYPE_XDP), .attachs = ~0ULL, }; subtest_userns(&opts, userns_obj_priv_prog); } + if (test__start_subtest("obj_priv_freplace_prog")) { + struct bpffs_opts opts = { + .cmds = bit(BPF_BTF_LOAD) | bit(BPF_PROG_LOAD) | bit(BPF_BTF_GET_FD_BY_ID), + .progs = bit(BPF_PROG_TYPE_EXT) | bit(BPF_PROG_TYPE_XDP), + .attachs = ~0ULL, + }; + subtest_userns(&opts, userns_obj_priv_freplace_prog); + } + if (test__start_subtest("obj_priv_freplace_prog_fail")) { + struct bpffs_opts opts = { + .cmds = bit(BPF_BTF_LOAD) | bit(BPF_PROG_LOAD) | bit(BPF_BTF_GET_FD_BY_ID), + .progs = bit(BPF_PROG_TYPE_EXT) | bit(BPF_PROG_TYPE_XDP), + .attachs = ~0ULL, + }; + subtest_userns(&opts, userns_obj_priv_freplace_prog_fail); + } if (test__start_subtest("obj_priv_btf_fail")) { struct bpffs_opts opts = { /* disallow BTF loading */ |