From patchwork Thu Feb 4 14:03:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hangbin Liu X-Patchwork-Id: 12067409 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 98D3AC433E0 for ; Thu, 4 Feb 2021 14:07:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 645E364E50 for ; Thu, 4 Feb 2021 14:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236636AbhBDOGt (ORCPT ); Thu, 4 Feb 2021 09:06:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236457AbhBDOFk (ORCPT ); Thu, 4 Feb 2021 09:05:40 -0500 Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C4BDAC06178A; Thu, 4 Feb 2021 06:04:29 -0800 (PST) Received: by mail-pl1-x62c.google.com with SMTP id s15so1808983plr.9; Thu, 04 Feb 2021 06:04:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=r3brtnq+PNKE/grJyOzhs6QEmBg42KjXW9y/gHQmtYg=; b=Jz7ef14fgzgVPhXROU84XTKlaTOHByW11LaRaVVy3SpJowQitY3wC5lMqEoap7YqL7 AWhjxujp2bHs/5XqokzOraGsiBt3b/mterJMyB4TwGbhK0wsw2Kt6du6QAeG0UxZjHEo ULFYScEzGrbmZePavAOnyQt3/qHOughEYSuHTW1ukQ0lRE4L2RCfPLXb5+E1cGG6dKri y+V8sFoJMslWQd8XSaQ0endqAbFKBwhT3ySrlGLLWiivjR/2cMZwcpILL/8Au/rfD+y6 aHt9nFU5wIlUja6oJUunkvL6RqkZFzIrEOOiwXjh/I17zvF8+DlLrGe2xQbxxhLgt+4n POjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=r3brtnq+PNKE/grJyOzhs6QEmBg42KjXW9y/gHQmtYg=; b=pq1dOdolC4TEqNX5soic3eVcvz5UNIbigJpAlEkQL3sFd5RQ4kphTvqwgb8I1Kj6Ae STnKEiRRtpQQ5pEi6XSiiO2EhmKnSN+B9NDQzMTzUZ5XBMOw37CnNnuxgFeGDbr4ZLzz nhrt/V1O8r1pyAZ+FjoKL4afuZrLLfWIO8VDyV2F4YHDOcfcY1HavhM5txVeKuL4QPaV MaergATyq1V57WT7PUZr4R56rIw24xQZ64rsdP66xncUf6YlrqIIA04iM70P7qB4OL0M yyVGMVy/E/3dGvqZwxS3X5J0cKcYaUK/KXb7U4/TThjNeLsOVJ/vcsyjQEbYcNSsUwxg pWLQ== X-Gm-Message-State: AOAM533y5qesqcs2S7/CO25DvPzowBAcCyolmRIpvkKYAxoHrIbHkJz4 fJZpOvxokTQ8fwVUf+BOo2Ruxzip+ber0shm X-Google-Smtp-Source: ABdhPJwtnjMzfg3dyRrPj52p4U49Nwe2ckmp1583cV2H3BdxlRMjiikB6whdB7cUrIAkql+6fyek4w== X-Received: by 2002:a17:90a:9ac:: with SMTP id 41mr8734430pjo.136.1612447468970; Thu, 04 Feb 2021 06:04:28 -0800 (PST) Received: from Leo-laptop-t470s.redhat.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 21sm5889394pfh.56.2021.02.04.06.04.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Feb 2021 06:04:28 -0800 (PST) From: Hangbin Liu To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Jiri Benc , Jesper Dangaard Brouer , Eelco Chaudron , ast@kernel.org, Daniel Borkmann , Lorenzo Bianconi , David Ahern , Andrii Nakryiko , Alexei Starovoitov , John Fastabend , Maciej Fijalkowski , Hangbin Liu Subject: [PATCHv18 bpf-next 5/6] selftests/bpf: Add verifier tests for bpf arg ARG_CONST_MAP_PTR_OR_NULL Date: Thu, 4 Feb 2021 22:03:16 +0800 Message-Id: <20210204140317.384296-6-liuhangbin@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210204140317.384296-1-liuhangbin@gmail.com> References: <20210125124516.3098129-1-liuhangbin@gmail.com> <20210204140317.384296-1-liuhangbin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Use helper bpf_redirect_map() and bpf_redirect_map_multi() to test bpf arg ARG_CONST_MAP_PTR and ARG_CONST_MAP_PTR_OR_NULL. Make sure the map arg could be verified correctly when it is NULL or valid map pointer. Add devmap and devmap_hash in struct bpf_test due to bpf_redirect_{map, map_multi} limit. Test result: ]# ./test_verifier 713 716 #713/p ARG_CONST_MAP_PTR: null pointer OK #714/p ARG_CONST_MAP_PTR: valid map pointer OK #715/p ARG_CONST_MAP_PTR_OR_NULL: null pointer for ex_map OK #716/p ARG_CONST_MAP_PTR_OR_NULL: valid map pointer for ex_map OK Summary: 4 PASSED, 0 SKIPPED, 0 FAILED Acked-by: Toke Høiland-Jørgensen Acked-by: John Fastabend Signed-off-by: Hangbin Liu --- tools/testing/selftests/bpf/test_verifier.c | 22 +++++- .../testing/selftests/bpf/verifier/map_ptr.c | 70 +++++++++++++++++++ 2 files changed, 91 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c index 58b5a349d3ba..8b474177dab0 100644 --- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -50,7 +50,7 @@ #define MAX_INSNS BPF_MAXINSNS #define MAX_TEST_INSNS 1000000 #define MAX_FIXUPS 8 -#define MAX_NR_MAPS 21 +#define MAX_NR_MAPS 23 #define MAX_TEST_RUNS 8 #define POINTER_VALUE 0xcafe4all #define TEST_DATA_LEN 64 @@ -88,6 +88,8 @@ struct bpf_test { int fixup_map_event_output[MAX_FIXUPS]; int fixup_map_reuseport_array[MAX_FIXUPS]; int fixup_map_ringbuf[MAX_FIXUPS]; + int fixup_map_devmap[MAX_FIXUPS]; + int fixup_map_devmap_hash[MAX_FIXUPS]; /* Expected verifier log output for result REJECT or VERBOSE_ACCEPT. * Can be a tab-separated sequence of expected strings. An empty string * means no log verification. @@ -718,6 +720,8 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type, int *fixup_map_event_output = test->fixup_map_event_output; int *fixup_map_reuseport_array = test->fixup_map_reuseport_array; int *fixup_map_ringbuf = test->fixup_map_ringbuf; + int *fixup_map_devmap = test->fixup_map_devmap; + int *fixup_map_devmap_hash = test->fixup_map_devmap_hash; if (test->fill_helper) { test->fill_insns = calloc(MAX_TEST_INSNS, sizeof(struct bpf_insn)); @@ -903,6 +907,22 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type, fixup_map_ringbuf++; } while (*fixup_map_ringbuf); } + if (*fixup_map_devmap) { + map_fds[20] = __create_map(BPF_MAP_TYPE_DEVMAP, + sizeof(u32), sizeof(u32), 1, 0); + do { + prog[*fixup_map_devmap].imm = map_fds[20]; + fixup_map_devmap++; + } while (*fixup_map_devmap); + } + if (*fixup_map_devmap_hash) { + map_fds[21] = __create_map(BPF_MAP_TYPE_DEVMAP_HASH, + sizeof(u32), sizeof(u32), 1, 0); + do { + prog[*fixup_map_devmap_hash].imm = map_fds[21]; + fixup_map_devmap_hash++; + } while (*fixup_map_devmap_hash); + } } struct libcap { diff --git a/tools/testing/selftests/bpf/verifier/map_ptr.c b/tools/testing/selftests/bpf/verifier/map_ptr.c index b117bdd3806d..1a532198c9c1 100644 --- a/tools/testing/selftests/bpf/verifier/map_ptr.c +++ b/tools/testing/selftests/bpf/verifier/map_ptr.c @@ -93,3 +93,73 @@ .fixup_map_hash_16b = { 4 }, .result = ACCEPT, }, +{ + "ARG_CONST_MAP_PTR: null pointer", + .insns = { + /* bpf_redirect_map arg1 (map) */ + BPF_MOV64_IMM(BPF_REG_1, 0), + /* bpf_redirect_map arg2 (ifindex) */ + BPF_MOV64_IMM(BPF_REG_2, 0), + /* bpf_redirect_map arg3 (flags) */ + BPF_MOV64_IMM(BPF_REG_3, 0), + BPF_EMIT_CALL(BPF_FUNC_redirect_map), + BPF_EXIT_INSN(), + }, + .result = REJECT, + .prog_type = BPF_PROG_TYPE_XDP, + .errstr = "R1 type=inv expected=map_ptr", +}, +{ + "ARG_CONST_MAP_PTR: valid map pointer", + .insns = { + BPF_MOV64_IMM(BPF_REG_1, 0), + /* bpf_redirect_map arg1 (map) */ + BPF_LD_MAP_FD(BPF_REG_1, 0), + /* bpf_redirect_map arg2 (ifindex) */ + BPF_MOV64_IMM(BPF_REG_2, 0), + /* bpf_redirect_map arg3 (flags) */ + BPF_MOV64_IMM(BPF_REG_3, 0), + BPF_EMIT_CALL(BPF_FUNC_redirect_map), + BPF_EXIT_INSN(), + }, + .fixup_map_devmap = { 1 }, + .result = ACCEPT, + .prog_type = BPF_PROG_TYPE_XDP, +}, +{ + "ARG_CONST_MAP_PTR_OR_NULL: null pointer for ex_map", + .insns = { + BPF_MOV64_IMM(BPF_REG_1, 0), + /* bpf_redirect_map_multi arg1 (in_map) */ + BPF_LD_MAP_FD(BPF_REG_1, 0), + /* bpf_redirect_map_multi arg2 (ex_map) */ + BPF_MOV64_IMM(BPF_REG_2, 0), + /* bpf_redirect_map_multi arg3 (flags) */ + BPF_MOV64_IMM(BPF_REG_3, 0), + BPF_EMIT_CALL(BPF_FUNC_redirect_map_multi), + BPF_EXIT_INSN(), + }, + .fixup_map_devmap = { 1 }, + .result = ACCEPT, + .prog_type = BPF_PROG_TYPE_XDP, + .retval = 4, +}, +{ + "ARG_CONST_MAP_PTR_OR_NULL: valid map pointer for ex_map", + .insns = { + BPF_MOV64_IMM(BPF_REG_1, 0), + /* bpf_redirect_map_multi arg1 (in_map) */ + BPF_LD_MAP_FD(BPF_REG_1, 0), + /* bpf_redirect_map_multi arg2 (ex_map) */ + BPF_LD_MAP_FD(BPF_REG_2, 1), + /* bpf_redirect_map_multi arg3 (flags) */ + BPF_MOV64_IMM(BPF_REG_3, 0), + BPF_EMIT_CALL(BPF_FUNC_redirect_map_multi), + BPF_EXIT_INSN(), + }, + .fixup_map_devmap = { 1 }, + .fixup_map_devmap_hash = { 3 }, + .result = ACCEPT, + .prog_type = BPF_PROG_TYPE_XDP, + .retval = 4, +},