From patchwork Fri Feb 16 19:34:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kui-Feng Lee X-Patchwork-Id: 13560503 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mail-yw1-f170.google.com (mail-yw1-f170.google.com [209.85.128.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D9092135A62 for ; Fri, 16 Feb 2024 19:34:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708112086; cv=none; b=cjfGuh4ugJiFdg1IDb7+g+rpz2qmpYofcJwBRmwCsuF61CItEhym8DSXgBP9BLQv9knKXS5s9ktQKs1h3F+PU2AoFGbVfXzzp1G7NlQrm8NyWUZLdBSvUj4+pnzxEKgcA40I3vkVYthocP3754NNT/C9stSIPWhf8UQcTsJRxlE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708112086; c=relaxed/simple; bh=KfP48j3g6Qs/KUDr0Uoaz5zol0Q8FdNBQEFhh+jY9GA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=eE6+dto2c/gnlFW+p4FOUcAh5uQhtnP+tW5ycUlDnm3HMvfMBKaMY6QGQJUclufEbFGMPAoY+NOy0nhrnG7PsVyyn+uHiuGnSVj3aOytIvyTfbr0hmYZAu8v89R9s3fFi3UOVcIIMKge/NzR9wAyImN4KMUkSOo1G+1L9ti/mzA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=JtETtP+3; arc=none smtp.client-ip=209.85.128.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JtETtP+3" Received: by mail-yw1-f170.google.com with SMTP id 00721157ae682-607e54b6cf5so13106577b3.0 for ; Fri, 16 Feb 2024 11:34:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1708112083; x=1708716883; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KImNjzyvTPHSKz361KqvhWjF9V6nBD+MTFCShFr62oA=; b=JtETtP+3MERyOGg834lg6UipznMUc2yfQKLnXhvtfw0UweiFXRfgGvTPIQK6/MpFDX VNvgBmxYF3eyU7LWEEevG4xZNePE9aLZMI0Kx0SaGCq00NnhUhj3darwZiAyeVyZLg// NDfijCodtopkqVtIUfZjcfuLDwwdm6oeC5SasuxnhJDtabS3W8w3z2vUcXvWEAuIfzwc qUiQfW0jOinrjRjNLpPkwQ+plFufFmIai1RQNZlZCETs8FBUxI+6ZPAbIHBdD0IGmYn9 +rSoS3c/d2V90bAvDoqYr6vcNCh2Ca7TowvxYl1EkH23N5iYyhnGyFzAK4I4LhQWc134 pAZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708112083; x=1708716883; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=KImNjzyvTPHSKz361KqvhWjF9V6nBD+MTFCShFr62oA=; b=M3fgq4ES+ya1bc3Xaql9GxLHjbQ2mAKqmSsdtrHbTr4SqTUAIFn8HXK5o3mkgogLca Hucls18oQZnaQRW+BJwBjjd6V29zQBu9JWBA//UnE8Iefqp1VqsFHJyd9X2HYTlnv4Td MbHXzWwt55ihMNBZwAtlllc1bIloq9pZRWpgWVtVWQ5Z86xfrgqBrI47ZzTQm65eYsvx +0dIkOvIfbyuLVcYXXzfxalXYbTfFzUuempsP7eI9iqRwtAxzF+Fv/iCehtEHt3dVSzl eFAPLwV8xa74WF9G4V1c7mmtmqIQqxLrF+wKchuxYRRe99+QtqCazROXOnbeU7HgqkD5 w/uw== X-Gm-Message-State: AOJu0YzDAaXxc5iERHHeuI6mfvuFpRFUrT2TpFHgS1gCXxgHCQSjCrgd r76CsL4VvCvCxJskOgGGACptuMoAN1Q7Ed4suon6YoeaHIVN5F4+3icglpW1 X-Google-Smtp-Source: AGHT+IFrzzH80Td+bO0gfCTPWItEZWRNPu2EdaAiWB+S60osAXfBGXVZIKmttgwsCeGW8duz6zXNtQ== X-Received: by 2002:a0d:e60b:0:b0:607:e6d5:612d with SMTP id p11-20020a0de60b000000b00607e6d5612dmr3818276ywe.1.1708112083476; Fri, 16 Feb 2024 11:34:43 -0800 (PST) Received: from kickker.attlocal.net ([2600:1700:6cf8:1240:6477:3a7d:9823:f253]) by smtp.gmail.com with ESMTPSA id i126-20020a0df884000000b00607c2ab443dsm470785ywf.130.2024.02.16.11.34.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Feb 2024 11:34:43 -0800 (PST) From: thinker.li@gmail.com To: bpf@vger.kernel.org, ast@kernel.org, martin.lau@linux.dev, song@kernel.org, kernel-team@meta.com, andrii@kernel.org Cc: sinquersw@gmail.com, kuifeng@meta.com, Kui-Feng Lee Subject: [PATCH bpf-next v3 3/3] selftests/bpf: Test case for lacking CFI stub functions. Date: Fri, 16 Feb 2024 11:34:34 -0800 Message-Id: <20240216193434.735874-4-thinker.li@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240216193434.735874-1-thinker.li@gmail.com> References: <20240216193434.735874-1-thinker.li@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net From: Kui-Feng Lee Ensure struct_ops rejects the registration of struct_ops types without proper CFI stub functions. bpf_test_no_cfi.ko is a module that attempts to register a struct_ops type called "bpf_test_no_cfi_ops" with varying levels of cfi_stubs. It starts with a NULL cfi_stub and ends with a fully complete cfi_stub. Only the fully complete cfi_stub should be accepted by struct_ops. The module can only be loaded successfully if these registrations yield the expected results. Signed-off-by: Kui-Feng Lee --- tools/testing/selftests/bpf/Makefile | 10 +- .../selftests/bpf/bpf_test_no_cfi/Makefile | 19 ++++ .../bpf/bpf_test_no_cfi/bpf_test_no_cfi.c | 93 +++++++++++++++++++ .../bpf/prog_tests/test_struct_ops_no_cfi.c | 31 +++++++ tools/testing/selftests/bpf/testing_helpers.c | 4 +- tools/testing/selftests/bpf/testing_helpers.h | 2 + 6 files changed, 156 insertions(+), 3 deletions(-) create mode 100644 tools/testing/selftests/bpf/bpf_test_no_cfi/Makefile create mode 100644 tools/testing/selftests/bpf/bpf_test_no_cfi/bpf_test_no_cfi.c create mode 100644 tools/testing/selftests/bpf/prog_tests/test_struct_ops_no_cfi.c diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile index dbb8c5f94f34..c219da5e60e6 100644 --- a/tools/testing/selftests/bpf/Makefile +++ b/tools/testing/selftests/bpf/Makefile @@ -132,7 +132,7 @@ TEST_GEN_PROGS_EXTENDED = test_sock_addr test_skb_cgroup_id_user \ flow_dissector_load test_flow_dissector test_tcp_check_syncookie_user \ test_lirc_mode2_user xdping test_cpp runqslower bench bpf_testmod.ko \ xskxceiver xdp_redirect_multi xdp_synproxy veristat xdp_hw_metadata \ - xdp_features + xdp_features bpf_test_no_cfi.ko TEST_GEN_FILES += liburandom_read.so urandom_read sign-file uprobe_multi @@ -254,6 +254,12 @@ $(OUTPUT)/bpf_testmod.ko: $(VMLINUX_BTF) $(RESOLVE_BTFIDS) $(wildcard bpf_testmo $(Q)$(MAKE) $(submake_extras) RESOLVE_BTFIDS=$(RESOLVE_BTFIDS) -C bpf_testmod $(Q)cp bpf_testmod/bpf_testmod.ko $@ +$(OUTPUT)/bpf_test_no_cfi.ko: $(VMLINUX_BTF) $(RESOLVE_BTFIDS) $(wildcard bpf_test_no_cfi/Makefile bpf_test_no_cfi/*.[ch]) + $(call msg,MOD,,$@) + $(Q)$(RM) bpf_test_no_cfi/bpf_test_no_cfi.ko # force re-compilation + $(Q)$(MAKE) $(submake_extras) RESOLVE_BTFIDS=$(RESOLVE_BTFIDS) -C bpf_test_no_cfi + $(Q)cp bpf_test_no_cfi/bpf_test_no_cfi.ko $@ + DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool ifneq ($(CROSS_COMPILE),) CROSS_BPFTOOL := $(SCRATCH_DIR)/sbin/bpftool @@ -628,6 +634,7 @@ TRUNNER_EXTRA_SOURCES := test_progs.c \ flow_dissector_load.h \ ip_check_defrag_frags.h TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \ + $(OUTPUT)/bpf_test_no_cfi.ko \ $(OUTPUT)/liburandom_read.so \ $(OUTPUT)/xdp_synproxy \ $(OUTPUT)/sign-file \ @@ -756,6 +763,7 @@ EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) \ feature bpftool \ $(addprefix $(OUTPUT)/,*.o *.skel.h *.lskel.h *.subskel.h \ no_alu32 cpuv4 bpf_gcc bpf_testmod.ko \ + bpf_test_no_cfi.ko \ liburandom_read.so) .PHONY: docs docs-clean diff --git a/tools/testing/selftests/bpf/bpf_test_no_cfi/Makefile b/tools/testing/selftests/bpf/bpf_test_no_cfi/Makefile new file mode 100644 index 000000000000..ed5143b79edf --- /dev/null +++ b/tools/testing/selftests/bpf/bpf_test_no_cfi/Makefile @@ -0,0 +1,19 @@ +BPF_TEST_NO_CFI_DIR := $(realpath $(dir $(abspath $(lastword $(MAKEFILE_LIST))))) +KDIR ?= $(abspath $(BPF_TEST_NO_CFI_DIR)/../../../../..) + +ifeq ($(V),1) +Q = +else +Q = @ +endif + +MODULES = bpf_test_no_cfi.ko + +obj-m += bpf_test_no_cfi.o + +all: + +$(Q)make -C $(KDIR) M=$(BPF_TEST_NO_CFI_DIR) modules + +clean: + +$(Q)make -C $(KDIR) M=$(BPF_TEST_NO_CFI_DIR) clean + diff --git a/tools/testing/selftests/bpf/bpf_test_no_cfi/bpf_test_no_cfi.c b/tools/testing/selftests/bpf/bpf_test_no_cfi/bpf_test_no_cfi.c new file mode 100644 index 000000000000..0fb63feecb31 --- /dev/null +++ b/tools/testing/selftests/bpf/bpf_test_no_cfi/bpf_test_no_cfi.c @@ -0,0 +1,93 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ +#include +#include +#include +#include + +struct bpf_test_no_cfi_ops { + void (*fn_1)(void); + void (*fn_2)(void); +}; + +static int dummy_init(struct btf *btf) +{ + return 0; +} + +static int dummy_init_member(const struct btf_type *t, + const struct btf_member *member, + void *kdata, const void *udata) +{ + return 0; +} + +static int dummy_reg(void *kdata) +{ + return 0; +} + +static void dummy_unreg(void *kdata) +{ +} + +static const struct bpf_verifier_ops dummy_verifier_ops; + +static void bpf_test_no_cfi_ops__fn_1(void) +{ +} + +static void bpf_test_no_cfi_ops__fn_2(void) +{ +} + +static struct bpf_test_no_cfi_ops __bpf_test_no_cfi_ops; + +static struct bpf_struct_ops bpf_bpf_test_no_cif_ops = { + .verifier_ops = &dummy_verifier_ops, + .init = dummy_init, + .init_member = dummy_init_member, + .reg = dummy_reg, + .unreg = dummy_unreg, + .name = "bpf_test_no_cfi_ops", + .owner = THIS_MODULE, +}; + +static int bpf_test_no_cfi_init(void) +{ + int ret; + + ret = register_bpf_struct_ops(&bpf_bpf_test_no_cif_ops, + bpf_test_no_cfi_ops); + if (!ret) + return -EINVAL; + + bpf_bpf_test_no_cif_ops.cfi_stubs = &__bpf_test_no_cfi_ops; + ret = register_bpf_struct_ops(&bpf_bpf_test_no_cif_ops, + bpf_test_no_cfi_ops); + if (!ret) + return -EINVAL; + + __bpf_test_no_cfi_ops.fn_1 = bpf_test_no_cfi_ops__fn_1; + ret = register_bpf_struct_ops(&bpf_bpf_test_no_cif_ops, + bpf_test_no_cfi_ops); + if (!ret) + return -EINVAL; + + __bpf_test_no_cfi_ops.fn_2 = bpf_test_no_cfi_ops__fn_2; + ret = register_bpf_struct_ops(&bpf_bpf_test_no_cif_ops, + bpf_test_no_cfi_ops); + return ret; +} + +static void bpf_test_no_cfi_exit(void) +{ +} + +module_init(bpf_test_no_cfi_init); +module_exit(bpf_test_no_cfi_exit); + +MODULE_AUTHOR("Kuifeng Lee"); +MODULE_DESCRIPTION("BPF no cfi_stubs test module"); +MODULE_LICENSE("Dual BSD/GPL"); + diff --git a/tools/testing/selftests/bpf/prog_tests/test_struct_ops_no_cfi.c b/tools/testing/selftests/bpf/prog_tests/test_struct_ops_no_cfi.c new file mode 100644 index 000000000000..11fbd9ebf1f8 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/test_struct_ops_no_cfi.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */ +#include +#include + +void test_struct_ops_no_cfi(void) +{ + int fd; + int err; + + fd = open("bpf_test_no_cfi.ko", O_RDONLY); + if (!ASSERT_GT(fd, 0, "open")) { + close(fd); + return; + } + + /* The module will try to register a struct_ops type with + * no cfi_stubs, incomplete cfi_stubs, and full cfi_stubs. + * + * Only full cfi_stubs should be allowed. The module will be loaded + * successfully if the result of the registration is as expected, + * or it fails. + */ + err = finit_module(fd, "", 0); + close(fd); + if (!ASSERT_OK(err, "finit_module")) + return; + + err = delete_module("bpf_test_no_cfi", 0); + ASSERT_OK(err, "delete_module"); +} diff --git a/tools/testing/selftests/bpf/testing_helpers.c b/tools/testing/selftests/bpf/testing_helpers.c index a59e56d804ee..28b6646662af 100644 --- a/tools/testing/selftests/bpf/testing_helpers.c +++ b/tools/testing/selftests/bpf/testing_helpers.c @@ -356,12 +356,12 @@ __u64 read_perf_max_sample_freq(void) return sample_freq; } -static int finit_module(int fd, const char *param_values, int flags) +int finit_module(int fd, const char *param_values, int flags) { return syscall(__NR_finit_module, fd, param_values, flags); } -static int delete_module(const char *name, int flags) +int delete_module(const char *name, int flags) { return syscall(__NR_delete_module, name, flags); } diff --git a/tools/testing/selftests/bpf/testing_helpers.h b/tools/testing/selftests/bpf/testing_helpers.h index d14de81727e6..d55f6ab12433 100644 --- a/tools/testing/selftests/bpf/testing_helpers.h +++ b/tools/testing/selftests/bpf/testing_helpers.h @@ -36,6 +36,8 @@ __u64 read_perf_max_sample_freq(void); int load_bpf_testmod(bool verbose); int unload_bpf_testmod(bool verbose); int kern_sync_rcu(void); +int finit_module(int fd, const char *param_values, int flags); +int delete_module(const char *name, int flags); static inline __u64 get_time_ns(void) {