From patchwork Sat May 14 03:12:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 12849685 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7944C433EF for ; Sat, 14 May 2022 03:12:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230391AbiENDMs (ORCPT ); Fri, 13 May 2022 23:12:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229729AbiENDMr (ORCPT ); Fri, 13 May 2022 23:12:47 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A566341A04 for ; Fri, 13 May 2022 20:12:45 -0700 (PDT) Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 24DNXOn0000856 for ; Fri, 13 May 2022 20:12:44 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=if/XCpmTYnbh4VqO6Yk6gMmg/7Vk+moTPwi8FKP/DbM=; b=Dox+Z4dPjv2pcP8y4Whxp2Uem50WdyzLNetBMmaexqwO/nqjQRl45u4ExMyY44J1Waoh Srh5ChH0KwP0j3VkhVNwWdpD1+drGim5a9wne1BYhHTrhPLh6yCKp3u9l6eL28HOQD6P +os83lQgKoTYflrW9/XrxJ5i/o3s96hmQYc= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3g1a03148x-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Fri, 13 May 2022 20:12:44 -0700 Received: from twshared8307.18.frc3.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 13 May 2022 20:12:43 -0700 Received: by devbig309.ftw3.facebook.com (Postfix, from userid 128203) id 2A9D6A45F412; Fri, 13 May 2022 20:12:32 -0700 (PDT) From: Yonghong Song To: CC: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Subject: [PATCH bpf-next v2 02/18] libbpf: Permit 64bit relocation value Date: Fri, 13 May 2022 20:12:32 -0700 Message-ID: <20220514031232.3241300-1-yhs@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220514031221.3240268-1-yhs@fb.com> References: <20220514031221.3240268-1-yhs@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: 8hwJ8GMUG4npQosHGFd8su_7KW34WG3K X-Proofpoint-ORIG-GUID: 8hwJ8GMUG4npQosHGFd8su_7KW34WG3K X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-13_11,2022-05-13_01,2022-02-23_01 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Currently, the libbpf limits the relocation value to be 32bit since all current relocations have such a limit. But with BTF_KIND_ENUM64 support, the enum value could be 64bit. So let us permit 64bit relocation value in libbpf. Signed-off-by: Yonghong Song Acked-by: Andrii Nakryiko --- tools/lib/bpf/relo_core.c | 49 +++++++++++++++++++++------------------ tools/lib/bpf/relo_core.h | 4 ++-- 2 files changed, 29 insertions(+), 24 deletions(-) diff --git a/tools/lib/bpf/relo_core.c b/tools/lib/bpf/relo_core.c index ba4453dfd1ed..aea16343a8f1 100644 --- a/tools/lib/bpf/relo_core.c +++ b/tools/lib/bpf/relo_core.c @@ -583,7 +583,7 @@ static int bpf_core_spec_match(struct bpf_core_spec *local_spec, static int bpf_core_calc_field_relo(const char *prog_name, const struct bpf_core_relo *relo, const struct bpf_core_spec *spec, - __u32 *val, __u32 *field_sz, __u32 *type_id, + __u64 *val, __u32 *field_sz, __u32 *type_id, bool *validate) { const struct bpf_core_accessor *acc; @@ -708,7 +708,7 @@ static int bpf_core_calc_field_relo(const char *prog_name, static int bpf_core_calc_type_relo(const struct bpf_core_relo *relo, const struct bpf_core_spec *spec, - __u32 *val, bool *validate) + __u64 *val, bool *validate) { __s64 sz; @@ -751,7 +751,7 @@ static int bpf_core_calc_type_relo(const struct bpf_core_relo *relo, static int bpf_core_calc_enumval_relo(const struct bpf_core_relo *relo, const struct bpf_core_spec *spec, - __u32 *val) + __u64 *val) { const struct btf_type *t; const struct btf_enum *e; @@ -929,7 +929,7 @@ int bpf_core_patch_insn(const char *prog_name, struct bpf_insn *insn, int insn_idx, const struct bpf_core_relo *relo, int relo_idx, const struct bpf_core_relo_res *res) { - __u32 orig_val, new_val; + __u64 orig_val, new_val; __u8 class; class = BPF_CLASS(insn->code); @@ -954,28 +954,30 @@ int bpf_core_patch_insn(const char *prog_name, struct bpf_insn *insn, if (BPF_SRC(insn->code) != BPF_K) return -EINVAL; if (res->validate && insn->imm != orig_val) { - pr_warn("prog '%s': relo #%d: unexpected insn #%d (ALU/ALU64) value: got %u, exp %u -> %u\n", + pr_warn("prog '%s': relo #%d: unexpected insn #%d (ALU/ALU64) value: got %u, exp %llu -> %llu\n", prog_name, relo_idx, - insn_idx, insn->imm, orig_val, new_val); + insn_idx, insn->imm, (unsigned long long)orig_val, + (unsigned long long)new_val); return -EINVAL; } orig_val = insn->imm; insn->imm = new_val; - pr_debug("prog '%s': relo #%d: patched insn #%d (ALU/ALU64) imm %u -> %u\n", + pr_debug("prog '%s': relo #%d: patched insn #%d (ALU/ALU64) imm %llu -> %llu\n", prog_name, relo_idx, insn_idx, - orig_val, new_val); + (unsigned long long)orig_val, (unsigned long long)new_val); break; case BPF_LDX: case BPF_ST: case BPF_STX: if (res->validate && insn->off != orig_val) { - pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDX/ST/STX) value: got %u, exp %u -> %u\n", - prog_name, relo_idx, insn_idx, insn->off, orig_val, new_val); + pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDX/ST/STX) value: got %u, exp %llu -> %llu\n", + prog_name, relo_idx, insn_idx, insn->off, (unsigned long long)orig_val, + (unsigned long long)new_val); return -EINVAL; } if (new_val > SHRT_MAX) { - pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) value too big: %u\n", - prog_name, relo_idx, insn_idx, new_val); + pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) value too big: %llu\n", + prog_name, relo_idx, insn_idx, (unsigned long long)new_val); return -ERANGE; } if (res->fail_memsz_adjust) { @@ -987,8 +989,9 @@ int bpf_core_patch_insn(const char *prog_name, struct bpf_insn *insn, orig_val = insn->off; insn->off = new_val; - pr_debug("prog '%s': relo #%d: patched insn #%d (LDX/ST/STX) off %u -> %u\n", - prog_name, relo_idx, insn_idx, orig_val, new_val); + pr_debug("prog '%s': relo #%d: patched insn #%d (LDX/ST/STX) off %llu -> %llu\n", + prog_name, relo_idx, insn_idx, (unsigned long long)orig_val, + (unsigned long long)new_val); if (res->new_sz != res->orig_sz) { int insn_bytes_sz, insn_bpf_sz; @@ -1026,18 +1029,18 @@ int bpf_core_patch_insn(const char *prog_name, struct bpf_insn *insn, imm = insn[0].imm + ((__u64)insn[1].imm << 32); if (res->validate && imm != orig_val) { - pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDIMM64) value: got %llu, exp %u -> %u\n", + pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDIMM64) value: got %llu, exp %llu -> %llu\n", prog_name, relo_idx, insn_idx, (unsigned long long)imm, - orig_val, new_val); + (unsigned long long)orig_val, (unsigned long long)new_val); return -EINVAL; } insn[0].imm = new_val; - insn[1].imm = 0; /* currently only 32-bit values are supported */ - pr_debug("prog '%s': relo #%d: patched insn #%d (LDIMM64) imm64 %llu -> %u\n", + insn[1].imm = new_val >> 32; + pr_debug("prog '%s': relo #%d: patched insn #%d (LDIMM64) imm64 %llu -> %llu\n", prog_name, relo_idx, insn_idx, - (unsigned long long)imm, new_val); + (unsigned long long)imm, (unsigned long long)new_val); break; } default: @@ -1261,10 +1264,12 @@ int bpf_core_calc_relo_insn(const char *prog_name, * decision and value, otherwise it's dangerous to * proceed due to ambiguity */ - pr_warn("prog '%s': relo #%d: relocation decision ambiguity: %s %u != %s %u\n", + pr_warn("prog '%s': relo #%d: relocation decision ambiguity: %s %llu != %s %llu\n", prog_name, relo_idx, - cand_res.poison ? "failure" : "success", cand_res.new_val, - targ_res->poison ? "failure" : "success", targ_res->new_val); + cand_res.poison ? "failure" : "success", + (unsigned long long)cand_res.new_val, + targ_res->poison ? "failure" : "success", + (unsigned long long)targ_res->new_val); return -EINVAL; } diff --git a/tools/lib/bpf/relo_core.h b/tools/lib/bpf/relo_core.h index 073039d8ca4f..7df0da082f2c 100644 --- a/tools/lib/bpf/relo_core.h +++ b/tools/lib/bpf/relo_core.h @@ -46,9 +46,9 @@ struct bpf_core_spec { struct bpf_core_relo_res { /* expected value in the instruction, unless validate == false */ - __u32 orig_val; + __u64 orig_val; /* new value that needs to be patched up to */ - __u32 new_val; + __u64 new_val; /* relocation unsuccessful, poison instruction, but don't fail load */ bool poison; /* some relocations can't be validated against orig_val */