From patchwork Thu Oct 8 00:10:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 11821991 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=-13.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 2E756C433E7 for ; Thu, 8 Oct 2020 00:10:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C8203207EA for ; Thu, 8 Oct 2020 00:10:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602115849; bh=FJvQ+d/U21rDOfDUvKqTUK0q5JvPCzb+v85kWWtVYss=; h=From:To:CC:Subject:Date:In-Reply-To:References:List-ID:From; b=M/c1EBounxofVFGvwGyPuJG668pVghzNzAPpei2Udb1pFXb9tlEl89GwrVYZ9oXSm 5BDQi3vN2IkASnihMCsyke40YpzzQOctK6OgtNkNfbzDy99aXx/1aEIZn+qC8KqZAi zTzO+LbzrX2W0LDHZEut4Cauo423OeduXZTriJP8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727463AbgJHAKt convert rfc822-to-8bit (ORCPT ); Wed, 7 Oct 2020 20:10:49 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:62590 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727261AbgJHAKt (ORCPT ); Wed, 7 Oct 2020 20:10:49 -0400 Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 09807wHP002200 for ; Wed, 7 Oct 2020 17:10:48 -0700 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 3418t9mpx9-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 07 Oct 2020 17:10:48 -0700 Received: from intmgw002.08.frc2.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:21d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 7 Oct 2020 17:10:29 -0700 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 300212EC7C0E; Wed, 7 Oct 2020 17:10:29 -0700 (PDT) From: Andrii Nakryiko To: , , , CC: , , Luka Perkov , Tony Ambardar Subject: [PATCH v3 bpf-next 1/4] libbpf: skip CO-RE relocations for not loaded BPF programs Date: Wed, 7 Oct 2020 17:10:21 -0700 Message-ID: <20201008001025.292064-2-andrii@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201008001025.292064-1-andrii@kernel.org> References: <20201008001025.292064-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-10-07_10:2020-10-07,2020-10-07 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 suspectscore=8 clxscore=1034 adultscore=0 impostorscore=0 mlxscore=0 malwarescore=0 mlxlogscore=895 priorityscore=1501 bulkscore=0 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010070156 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Bypass CO-RE relocations step for BPF programs that are not going to be loaded. This allows to have BPF programs compiled in and disabled dynamically if kernel is not supposed to provide enough relocation information. In such case, there won't be unnecessary warnings about failed relocations. Fixes: d929758101fc ("libbpf: Support disabling auto-loading BPF programs") Signed-off-by: Andrii Nakryiko --- tools/lib/bpf/libbpf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index faec389c4849..07d62771472f 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -5765,6 +5765,11 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path) err = -EINVAL; goto out; } + /* no need to apply CO-RE relocation if the program is + * not going to be loaded + */ + if (!prog->load) + continue; err = bpf_core_apply_relo(prog, rec, i, obj->btf, targ_btf, cand_cache); From patchwork Thu Oct 8 00:10:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 11821993 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=-13.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 C364DC433E7 for ; Thu, 8 Oct 2020 00:10:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76011207EA for ; Thu, 8 Oct 2020 00:10:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602115855; bh=LWzIv/EbFEXBxLQjcS5NM/48KnH5Gs94FNBP8er7OJI=; h=From:To:CC:Subject:Date:In-Reply-To:References:List-ID:From; b=x1XYLxYoteo9XezRq+DDniKwV50aq6v1N1bDPJ/Yw3xzf3Ggdgo5dNY9SBLo3Z0m5 xsVKw4TbxR41bD0OlakdMD1MNx4Zldgk3rhNusRTzPZDoVbnPf0uYRL5aW6r1JjQDS QYHCHu6kxFJxr9TzFnW7ugIMWP9a5H4lOJRsxH3Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727742AbgJHAKz convert rfc822-to-8bit (ORCPT ); Wed, 7 Oct 2020 20:10:55 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:17190 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727261AbgJHAKx (ORCPT ); Wed, 7 Oct 2020 20:10:53 -0400 Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 09807wHc002200 for ; Wed, 7 Oct 2020 17:10:51 -0700 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 3418t9mpx9-16 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 07 Oct 2020 17:10:51 -0700 Received: from intmgw001.08.frc2.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:21d::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 7 Oct 2020 17:10:38 -0700 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 610112EC7C0E; Wed, 7 Oct 2020 17:10:31 -0700 (PDT) From: Andrii Nakryiko To: , , , CC: , , Luka Perkov , Tony Ambardar , Andrii Nakryiko Subject: [PATCH v3 bpf-next 2/4] libbpf: support safe subset of load/store instruction resizing with CO-RE Date: Wed, 7 Oct 2020 17:10:22 -0700 Message-ID: <20201008001025.292064-3-andrii@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201008001025.292064-1-andrii@kernel.org> References: <20201008001025.292064-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-10-07_10:2020-10-07,2020-10-07 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 suspectscore=8 clxscore=1034 adultscore=0 impostorscore=0 mlxscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 bulkscore=0 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010070156 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Andrii Nakryiko Add support for patching instructions of the following form: - rX = *(T *)(rY + ); - *(T *)(rX + ) = rY; - *(T *)(rX + ) = , where T is one of {u8, u16, u32, u64}. For such instructions, if the actual kernel field recorded in CO-RE relocation has a different size than the one recorded locally (e.g., from vmlinux.h), then libbpf will adjust T to an appropriate 1-, 2-, 4-, or 8-byte loads. In general, such transformation is not always correct and could lead to invalid final value being loaded or stored. But two classes of cases are always safe: - if both local and target (kernel) types are unsigned integers, but of different sizes, then it's OK to adjust load/store instruction according to the necessary memory size. Zero-extending nature of such instructions and unsignedness make sure that the final value is always correct; - pointer size mismatch between BPF target architecture (which is always 64-bit) and 32-bit host kernel architecture can be similarly resolved automatically, because pointer is essentially an unsigned integer. Loading 32-bit pointer into 64-bit BPF register with zero extension will leave correct pointer in the register. Both cases are necessary to support CO-RE on 32-bit kernels, as `unsigned long` in vmlinux.h generated from 32-bit kernel is 32-bit, but when compiled with BPF program for BPF target it will be treated by compiler as 64-bit integer. Similarly, pointers in vmlinux.h are 32-bit for kernel, but treated as 64-bit values by compiler for BPF target. Both problems are now resolved by libbpf for direct memory reads. But similar transformations are useful in general when kernel fields are "resized" from, e.g., unsigned int to unsigned long (or vice versa). Now, similar transformations for signed integers are not safe to perform as they will result in incorrect sign extension of the value. If such situation is detected, libbpf will emit helpful message and will poison the instruction. Not failing immediately means that it's possible to guard the instruction based on kernel version (or other conditions) and make sure it's not reachable. If there is a need to read signed integers that change sizes between different kernels, it's possible to use BPF_CORE_READ_BITFIELD() macro, which works both with bitfields and non-bitfield integers of any signedness and handles sign-extension properly. Also, bpf_core_read() with proper size and/or use of bpf_core_field_size() relocation could allow to deal with such complicated situations explicitly, if not so conventiently as direct memory reads. Selftests added in a separate patch in progs/test_core_autosize.c demonstrate both direct memory and probed use cases. BPF_CORE_READ() is not changed and it won't deal with such situations as automatically as direct memory reads due to the signedness integer limitations, which are much harder to detect and control with compiler macro magic. So it's encouraged to utilize direct memory reads as much as possible. Signed-off-by: Andrii Nakryiko --- tools/lib/bpf/libbpf.c | 144 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 136 insertions(+), 8 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 07d62771472f..032cf0049ddb 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -5040,16 +5040,19 @@ static int bpf_core_spec_match(struct bpf_core_spec *local_spec, static int bpf_core_calc_field_relo(const struct bpf_program *prog, const struct bpf_core_relo *relo, const struct bpf_core_spec *spec, - __u32 *val, bool *validate) + __u32 *val, __u32 *field_sz, __u32 *type_id, + bool *validate) { const struct bpf_core_accessor *acc; const struct btf_type *t; - __u32 byte_off, byte_sz, bit_off, bit_sz; + __u32 byte_off, byte_sz, bit_off, bit_sz, field_type_id; const struct btf_member *m; const struct btf_type *mt; bool bitfield; __s64 sz; + *field_sz = 0; + if (relo->kind == BPF_FIELD_EXISTS) { *val = spec ? 1 : 0; return 0; @@ -5065,6 +5068,12 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog, if (!acc->name) { if (relo->kind == BPF_FIELD_BYTE_OFFSET) { *val = spec->bit_offset / 8; + /* remember field size for load/store mem size */ + sz = btf__resolve_size(spec->btf, acc->type_id); + if (sz < 0) + return -EINVAL; + *field_sz = sz; + *type_id = acc->type_id; } else if (relo->kind == BPF_FIELD_BYTE_SIZE) { sz = btf__resolve_size(spec->btf, acc->type_id); if (sz < 0) @@ -5081,7 +5090,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog, } m = btf_members(t) + acc->idx; - mt = skip_mods_and_typedefs(spec->btf, m->type, NULL); + mt = skip_mods_and_typedefs(spec->btf, m->type, &field_type_id); bit_off = spec->bit_offset; bit_sz = btf_member_bitfield_size(t, acc->idx); @@ -5101,7 +5110,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog, byte_off = bit_off / 8 / byte_sz * byte_sz; } } else { - sz = btf__resolve_size(spec->btf, m->type); + sz = btf__resolve_size(spec->btf, field_type_id); if (sz < 0) return -EINVAL; byte_sz = sz; @@ -5119,6 +5128,10 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog, switch (relo->kind) { case BPF_FIELD_BYTE_OFFSET: *val = byte_off; + if (!bitfield) { + *field_sz = byte_sz; + *type_id = field_type_id; + } break; case BPF_FIELD_BYTE_SIZE: *val = byte_sz; @@ -5219,6 +5232,19 @@ struct bpf_core_relo_res bool poison; /* some relocations can't be validated against orig_val */ bool validate; + /* for field byte offset relocations or the forms: + * *(T *)(rX + ) = rY + * rX = *(T *)(rY + ), + * we remember original and resolved field size to adjust direct + * memory loads of pointers and integers; this is necessary for 32-bit + * host kernel architectures, but also allows to automatically + * relocate fields that were resized from, e.g., u32 to u64, etc. + */ + bool fail_memsz_adjust; + __u32 orig_sz; + __u32 orig_type_id; + __u32 new_sz; + __u32 new_type_id; }; /* Calculate original and target relocation values, given local and target @@ -5240,10 +5266,56 @@ static int bpf_core_calc_relo(const struct bpf_program *prog, res->new_val = 0; res->poison = false; res->validate = true; + res->fail_memsz_adjust = false; + res->orig_sz = res->new_sz = 0; + res->orig_type_id = res->new_type_id = 0; if (core_relo_is_field_based(relo->kind)) { - err = bpf_core_calc_field_relo(prog, relo, local_spec, &res->orig_val, &res->validate); - err = err ?: bpf_core_calc_field_relo(prog, relo, targ_spec, &res->new_val, NULL); + err = bpf_core_calc_field_relo(prog, relo, local_spec, + &res->orig_val, &res->orig_sz, + &res->orig_type_id, &res->validate); + err = err ?: bpf_core_calc_field_relo(prog, relo, targ_spec, + &res->new_val, &res->new_sz, + &res->new_type_id, NULL); + if (err) + goto done; + /* Validate if it's safe to adjust load/store memory size. + * Adjustments are performed only if original and new memory + * sizes differ. + */ + res->fail_memsz_adjust = false; + if (res->orig_sz != res->new_sz) { + const struct btf_type *orig_t, *new_t; + + orig_t = btf__type_by_id(local_spec->btf, res->orig_type_id); + new_t = btf__type_by_id(targ_spec->btf, res->new_type_id); + + /* There are two use cases in which it's safe to + * adjust load/store's mem size: + * - reading a 32-bit kernel pointer, while on BPF + * size pointers are always 64-bit; in this case + * it's safe to "downsize" instruction size due to + * pointer being treated as unsigned integer with + * zero-extended upper 32-bits; + * - reading unsigned integers, again due to + * zero-extension is preserving the value correctly. + * + * In all other cases it's incorrect to attempt to + * load/store field because read value will be + * incorrect, so we poison relocated instruction. + */ + if (btf_is_ptr(orig_t) && btf_is_ptr(new_t)) + goto done; + if (btf_is_int(orig_t) && btf_is_int(new_t) && + btf_int_encoding(orig_t) != BTF_INT_SIGNED && + btf_int_encoding(new_t) != BTF_INT_SIGNED) + goto done; + + /* mark as invalid mem size adjustment, but this will + * only be checked for LDX/STX/ST insns + */ + res->fail_memsz_adjust = true; + } } else if (core_relo_is_type_based(relo->kind)) { err = bpf_core_calc_type_relo(relo, local_spec, &res->orig_val); err = err ?: bpf_core_calc_type_relo(relo, targ_spec, &res->new_val); @@ -5252,6 +5324,7 @@ static int bpf_core_calc_relo(const struct bpf_program *prog, err = err ?: bpf_core_calc_enumval_relo(relo, targ_spec, &res->new_val); } +done: if (err == -EUCLEAN) { /* EUCLEAN is used to signal instruction poisoning request */ res->poison = true; @@ -5291,6 +5364,28 @@ static bool is_ldimm64(struct bpf_insn *insn) return insn->code == (BPF_LD | BPF_IMM | BPF_DW); } +static int insn_bpf_size_to_bytes(struct bpf_insn *insn) +{ + switch (BPF_SIZE(insn->code)) { + case BPF_DW: return 8; + case BPF_W: return 4; + case BPF_H: return 2; + case BPF_B: return 1; + default: return -1; + } +} + +static int insn_bytes_to_bpf_size(__u32 sz) +{ + switch (sz) { + case 8: return BPF_DW; + case 4: return BPF_W; + case 2: return BPF_H; + case 1: return BPF_B; + default: return -1; + } +} + /* * Patch relocatable BPF instruction. * @@ -5300,10 +5395,13 @@ static bool is_ldimm64(struct bpf_insn *insn) * spec, and is checked before patching instruction. If actual insn->imm value * is wrong, bail out with error. * - * Currently three kinds of BPF instructions are supported: + * Currently supported classes of BPF instruction are: * 1. rX = (assignment with immediate operand); * 2. rX += (arithmetic operations with immediate operand); - * 3. rX = (load with 64-bit immediate value). + * 3. rX = (load with 64-bit immediate value); + * 4. rX = *(T *)(rY + ), where T is one of {u8, u16, u32, u64}; + * 5. *(T *)(rX + ) = rY, where T is one of {u8, u16, u32, u64}; + * 6. *(T *)(rX + ) = , where T is one of {u8, u16, u32, u64}. */ static int bpf_core_patch_insn(struct bpf_program *prog, const struct bpf_core_relo *relo, @@ -5327,6 +5425,7 @@ static int bpf_core_patch_insn(struct bpf_program *prog, class = BPF_CLASS(insn->code); if (res->poison) { +poison: /* poison second part of ldimm64 to avoid confusing error from * verifier about "unknown opcode 00" */ @@ -5369,10 +5468,39 @@ static int bpf_core_patch_insn(struct bpf_program *prog, prog->name, relo_idx, insn_idx, new_val); return -ERANGE; } + if (res->fail_memsz_adjust) { + pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) accesses field incorrectly. " + "Make sure you are accessing pointers, unsigned integers, or fields of matching type and size.\n", + prog->name, relo_idx, insn_idx); + goto poison; + } + 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); + + if (res->new_sz != res->orig_sz) { + int insn_bytes_sz, insn_bpf_sz; + + insn_bytes_sz = insn_bpf_size_to_bytes(insn); + if (insn_bytes_sz != res->orig_sz) { + pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) unexpected mem size: got %d, exp %u\n", + prog->name, relo_idx, insn_idx, insn_bytes_sz, res->orig_sz); + return -EINVAL; + } + + insn_bpf_sz = insn_bytes_to_bpf_size(res->new_sz); + if (insn_bpf_sz < 0) { + pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) invalid new mem size: %u\n", + prog->name, relo_idx, insn_idx, res->new_sz); + return -EINVAL; + } + + insn->code = BPF_MODE(insn->code) | insn_bpf_sz | BPF_CLASS(insn->code); + pr_debug("prog '%s': relo #%d: patched insn #%d (LDX/ST/STX) mem_sz %u -> %u\n", + prog->name, relo_idx, insn_idx, res->orig_sz, res->new_sz); + } break; case BPF_LD: { __u64 imm; From patchwork Thu Oct 8 00:10:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 11821987 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=-13.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 7CF87C433E7 for ; Thu, 8 Oct 2020 00:10:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 13C47207EA for ; Thu, 8 Oct 2020 00:10:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602115842; bh=uOg4Fgq2ourwtjRf5wReXbuRY6Ld06iPhkJOKwvoq48=; h=From:To:CC:Subject:Date:In-Reply-To:References:List-ID:From; b=UW9tE4kFCmOMmLQLnKeRJr0eSl71ukURlk31U6fv48g/dgH+/ggZ9vtCnIOrOaVUV MSseeyFaneBW6eGHt3AFzziemBBJho79XIluTYDPUqQaD65wA9tqJ26sRbGjHzSSQ8 wjS0TR/+IWA3SapS8qFZyXn2bDC02CxSDdzeThGo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727645AbgJHAKl convert rfc822-to-8bit (ORCPT ); Wed, 7 Oct 2020 20:10:41 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:50724 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726371AbgJHAKi (ORCPT ); Wed, 7 Oct 2020 20:10:38 -0400 Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 09805CBc007278 for ; Wed, 7 Oct 2020 17:10:37 -0700 Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 341gpajfdq-5 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 07 Oct 2020 17:10:37 -0700 Received: from intmgw002.03.ash8.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::c) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 7 Oct 2020 17:10:36 -0700 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id 8A5A02EC7C0E; Wed, 7 Oct 2020 17:10:33 -0700 (PDT) From: Andrii Nakryiko To: , , , CC: , , Luka Perkov , Tony Ambardar , Andrii Nakryiko Subject: [PATCH v3 bpf-next 3/4] libbpf: allow specifying both ELF and raw BTF for CO-RE BTF override Date: Wed, 7 Oct 2020 17:10:23 -0700 Message-ID: <20201008001025.292064-4-andrii@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201008001025.292064-1-andrii@kernel.org> References: <20201008001025.292064-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-10-07_10:2020-10-07,2020-10-07 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 phishscore=0 suspectscore=8 mlxlogscore=999 adultscore=0 mlxscore=0 impostorscore=0 spamscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010070156 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Andrii Nakryiko Use generalized BTF parsing logic, making it possible to parse BTF both from ELF file, as well as a raw BTF dump. This makes it easier to write custom tests with manually generated BTFs. Signed-off-by: Andrii Nakryiko --- tools/lib/bpf/libbpf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 032cf0049ddb..105cb8ad1d75 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -5842,7 +5842,7 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path) return 0; if (targ_btf_path) - targ_btf = btf__parse_elf(targ_btf_path, NULL); + targ_btf = btf__parse(targ_btf_path, NULL); else targ_btf = obj->btf_vmlinux; if (IS_ERR_OR_NULL(targ_btf)) { From patchwork Thu Oct 8 00:10:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 11821989 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=-13.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 10C66C43467 for ; Thu, 8 Oct 2020 00:10:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 99E36207EA for ; Thu, 8 Oct 2020 00:10:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602115847; bh=iUZU5RXhRR0RWehEaTknbZ6R6pvN5wAEvUIXT4a5li8=; h=From:To:CC:Subject:Date:In-Reply-To:References:List-ID:From; b=i/kb8JoIXRupEOnJ+7Sec7dqJqVarGlkyAF4UjuzCxkurMXYPK2LRcPHJeficF+bD 3X9ZWCOAef4aSHQMrfSuEJnuYGH+TtFwdFE3eS8gZq3HgsaUX/m1tU1ytdaeyklxNa Z9ypeJX6o6QDjWvLfWxhL1mO4L7sRtwy9y98Xs6o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727278AbgJHAKr convert rfc822-to-8bit (ORCPT ); Wed, 7 Oct 2020 20:10:47 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:4854 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727261AbgJHAKr (ORCPT ); Wed, 7 Oct 2020 20:10:47 -0400 Received: from pps.filterd (m0148460.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 09804cA6006098 for ; Wed, 7 Oct 2020 17:10:45 -0700 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 341gpajfe3-4 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 07 Oct 2020 17:10:45 -0700 Received: from intmgw004.08.frc2.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:11d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Wed, 7 Oct 2020 17:10:43 -0700 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id E35112EC7C0E; Wed, 7 Oct 2020 17:10:35 -0700 (PDT) From: Andrii Nakryiko To: , , , CC: , , Luka Perkov , Tony Ambardar , Andrii Nakryiko Subject: [PATCH v3 bpf-next 4/4] selftests/bpf: validate libbpf's auto-sizing of LD/ST/STX instructions Date: Wed, 7 Oct 2020 17:10:24 -0700 Message-ID: <20201008001025.292064-5-andrii@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201008001025.292064-1-andrii@kernel.org> References: <20201008001025.292064-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-10-07_10:2020-10-07,2020-10-07 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 phishscore=0 suspectscore=25 mlxlogscore=740 adultscore=0 mlxscore=0 impostorscore=0 spamscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010070156 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Andrii Nakryiko Add selftests validating libbpf's auto-resizing of load/store instructions when used with CO-RE relocations. An explicit and manual approach with using bpf_core_read() is also demonstrated and tested. Separate BPF program is supposed to fail due to using signed integers of sizes that differ from kernel's sizes. To reliably simulate 32-bit BTF (i.e., the one with sizeof(long) == sizeof(void *) == 4), selftest generates its own custom BTF and passes it as a replacement for real kernel BTF. This allows to test 32/64-bitness mix on all architectures. Signed-off-by: Andrii Nakryiko --- .../selftests/bpf/prog_tests/core_autosize.c | 225 ++++++++++++++++++ .../selftests/bpf/progs/test_core_autosize.c | 172 +++++++++++++ 2 files changed, 397 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/core_autosize.c create mode 100644 tools/testing/selftests/bpf/progs/test_core_autosize.c diff --git a/tools/testing/selftests/bpf/prog_tests/core_autosize.c b/tools/testing/selftests/bpf/prog_tests/core_autosize.c new file mode 100644 index 000000000000..981c251453d9 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/core_autosize.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include +#include + +/* real layout and sizes according to test's (32-bit) BTF + * needs to be defined before skeleton is included */ +struct test_struct___real { + unsigned int ptr; /* can't use `void *`, it is always 8 byte in BPF target */ + unsigned int val2; + unsigned long long val1; + unsigned short val3; + unsigned char val4; + unsigned char _pad; +}; + +#include "test_core_autosize.skel.h" + +static int duration = 0; + +static struct { + unsigned long long ptr_samesized; + unsigned long long val1_samesized; + unsigned long long val2_samesized; + unsigned long long val3_samesized; + unsigned long long val4_samesized; + struct test_struct___real output_samesized; + + unsigned long long ptr_downsized; + unsigned long long val1_downsized; + unsigned long long val2_downsized; + unsigned long long val3_downsized; + unsigned long long val4_downsized; + struct test_struct___real output_downsized; + + unsigned long long ptr_probed; + unsigned long long val1_probed; + unsigned long long val2_probed; + unsigned long long val3_probed; + unsigned long long val4_probed; + + unsigned long long ptr_signed; + unsigned long long val1_signed; + unsigned long long val2_signed; + unsigned long long val3_signed; + unsigned long long val4_signed; + struct test_struct___real output_signed; +} out; + +void test_core_autosize(void) +{ + char btf_file[] = "/tmp/core_autosize.btf.XXXXXX"; + int err, fd = -1, zero = 0; + int char_id, short_id, int_id, long_long_id, void_ptr_id, id; + struct test_core_autosize* skel = NULL; + struct bpf_object_load_attr load_attr = {}; + struct bpf_program *prog; + struct bpf_map *bss_map; + struct btf *btf = NULL; + size_t written; + const void *raw_data; + __u32 raw_sz; + FILE *f = NULL; + + btf = btf__new_empty(); + if (!ASSERT_OK_PTR(btf, "empty_btf")) + return; + /* Emit the following struct with 32-bit pointer size: + * + * struct test_struct { + * void *ptr; + * unsigned long val2; + * unsigned long long val1; + * unsigned short val3; + * unsigned char val4; + * char: 8; + * }; + * + * This struct is going to be used as the "kernel BTF" for this test. + * It's equivalent memory-layout-wise to test_struct__real above. + */ + + /* force 32-bit pointer size */ + btf__set_pointer_size(btf, 4); + + char_id = btf__add_int(btf, "unsigned char", 1, 0); + ASSERT_EQ(char_id, 1, "char_id"); + short_id = btf__add_int(btf, "unsigned short", 2, 0); + ASSERT_EQ(short_id, 2, "short_id"); + /* "long unsigned int" of 4 byte size tells BTF that sizeof(void *) == 4 */ + int_id = btf__add_int(btf, "long unsigned int", 4, 0); + ASSERT_EQ(int_id, 3, "int_id"); + long_long_id = btf__add_int(btf, "unsigned long long", 8, 0); + ASSERT_EQ(long_long_id, 4, "long_long_id"); + void_ptr_id = btf__add_ptr(btf, 0); + ASSERT_EQ(void_ptr_id, 5, "void_ptr_id"); + + id = btf__add_struct(btf, "test_struct", 20 /* bytes */); + ASSERT_EQ(id, 6, "struct_id"); + err = btf__add_field(btf, "ptr", void_ptr_id, 0, 0); + err = err ?: btf__add_field(btf, "val2", int_id, 32, 0); + err = err ?: btf__add_field(btf, "val1", long_long_id, 64, 0); + err = err ?: btf__add_field(btf, "val3", short_id, 128, 0); + err = err ?: btf__add_field(btf, "val4", char_id, 144, 0); + ASSERT_OK(err, "struct_fields"); + + fd = mkstemp(btf_file); + if (CHECK(fd < 0, "btf_tmp", "failed to create file: %d\n", fd)) + goto cleanup; + f = fdopen(fd, "w"); + if (!ASSERT_OK_PTR(f, "btf_fdopen")) + goto cleanup; + + raw_data = btf__get_raw_data(btf, &raw_sz); + if (!ASSERT_OK_PTR(raw_data, "raw_data")) + goto cleanup; + written = fwrite(raw_data, 1, raw_sz, f); + if (CHECK(written != raw_sz, "btf_write", "written: %zu, errno: %d\n", written, errno)) + goto cleanup; + fflush(f); + fclose(f); + f = NULL; + close(fd); + fd = -1; + + /* open and load BPF program with custom BTF as the kernel BTF */ + skel = test_core_autosize__open(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + /* disable handle_signed() for now */ + prog = bpf_object__find_program_by_name(skel->obj, "handle_signed"); + if (!ASSERT_OK_PTR(prog, "prog_find")) + goto cleanup; + bpf_program__set_autoload(prog, false); + + load_attr.obj = skel->obj; + load_attr.target_btf_path = btf_file; + err = bpf_object__load_xattr(&load_attr); + if (!ASSERT_OK(err, "prog_load")) + goto cleanup; + + prog = bpf_object__find_program_by_name(skel->obj, "handle_samesize"); + if (!ASSERT_OK_PTR(prog, "prog_find")) + goto cleanup; + skel->links.handle_samesize = bpf_program__attach(prog); + if (!ASSERT_OK_PTR(skel->links.handle_samesize, "prog_attach")) + goto cleanup; + + prog = bpf_object__find_program_by_name(skel->obj, "handle_downsize"); + if (!ASSERT_OK_PTR(prog, "prog_find")) + goto cleanup; + skel->links.handle_downsize = bpf_program__attach(prog); + if (!ASSERT_OK_PTR(skel->links.handle_downsize, "prog_attach")) + goto cleanup; + + prog = bpf_object__find_program_by_name(skel->obj, "handle_probed"); + if (!ASSERT_OK_PTR(prog, "prog_find")) + goto cleanup; + skel->links.handle_probed = bpf_program__attach(prog); + if (!ASSERT_OK_PTR(skel->links.handle_probed, "prog_attach")) + goto cleanup; + + usleep(1); + + bss_map = bpf_object__find_map_by_name(skel->obj, "test_cor.bss"); + if (!ASSERT_OK_PTR(bss_map, "bss_map_find")) + goto cleanup; + + err = bpf_map_lookup_elem(bpf_map__fd(bss_map), &zero, (void *)&out); + if (!ASSERT_OK(err, "bss_lookup")) + goto cleanup; + + ASSERT_EQ(out.ptr_samesized, 0x01020304, "ptr_samesized"); + ASSERT_EQ(out.val1_samesized, 0x1020304050607080, "val1_samesized"); + ASSERT_EQ(out.val2_samesized, 0x0a0b0c0d, "val2_samesized"); + ASSERT_EQ(out.val3_samesized, 0xfeed, "val3_samesized"); + ASSERT_EQ(out.val4_samesized, 0xb9, "val4_samesized"); + ASSERT_EQ(out.output_samesized.ptr, 0x01020304, "ptr_samesized"); + ASSERT_EQ(out.output_samesized.val1, 0x1020304050607080, "val1_samesized"); + ASSERT_EQ(out.output_samesized.val2, 0x0a0b0c0d, "val2_samesized"); + ASSERT_EQ(out.output_samesized.val3, 0xfeed, "val3_samesized"); + ASSERT_EQ(out.output_samesized.val4, 0xb9, "val4_samesized"); + + ASSERT_EQ(out.ptr_downsized, 0x01020304, "ptr_downsized"); + ASSERT_EQ(out.val1_downsized, 0x1020304050607080, "val1_downsized"); + ASSERT_EQ(out.val2_downsized, 0x0a0b0c0d, "val2_downsized"); + ASSERT_EQ(out.val3_downsized, 0xfeed, "val3_downsized"); + ASSERT_EQ(out.val4_downsized, 0xb9, "val4_downsized"); + ASSERT_EQ(out.output_downsized.ptr, 0x01020304, "ptr_downsized"); + ASSERT_EQ(out.output_downsized.val1, 0x1020304050607080, "val1_downsized"); + ASSERT_EQ(out.output_downsized.val2, 0x0a0b0c0d, "val2_downsized"); + ASSERT_EQ(out.output_downsized.val3, 0xfeed, "val3_downsized"); + ASSERT_EQ(out.output_downsized.val4, 0xb9, "val4_downsized"); + + ASSERT_EQ(out.ptr_probed, 0x01020304, "ptr_probed"); + ASSERT_EQ(out.val1_probed, 0x1020304050607080, "val1_probed"); + ASSERT_EQ(out.val2_probed, 0x0a0b0c0d, "val2_probed"); + ASSERT_EQ(out.val3_probed, 0xfeed, "val3_probed"); + ASSERT_EQ(out.val4_probed, 0xb9, "val4_probed"); + + test_core_autosize__destroy(skel); + skel = NULL; + + /* now re-load with handle_signed() enabled, it should fail loading */ + skel = test_core_autosize__open(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + load_attr.obj = skel->obj; + load_attr.target_btf_path = btf_file; + err = bpf_object__load_xattr(&load_attr); + if (!ASSERT_ERR(err, "bad_prog_load")) + goto cleanup; + +cleanup: + if (f) + fclose(f); + if (fd >= 0) + close(fd); + remove(btf_file); + btf__free(btf); + test_core_autosize__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_core_autosize.c b/tools/testing/selftests/bpf/progs/test_core_autosize.c new file mode 100644 index 000000000000..44f5aa2e8956 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_core_autosize.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2020 Facebook */ + +#include +#include +#include +#include + +char _license[] SEC("license") = "GPL"; + +/* fields of exactly the same size */ +struct test_struct___samesize { + void *ptr; + unsigned long long val1; + unsigned int val2; + unsigned short val3; + unsigned char val4; +} __attribute((preserve_access_index)); + +/* unsigned fields that have to be downsized by libbpf */ +struct test_struct___downsize { + void *ptr; + unsigned long val1; + unsigned long val2; + unsigned long val3; + unsigned long val4; + /* total sz: 40 */ +} __attribute__((preserve_access_index)); + +/* fields with signed integers of wrong size, should be rejected */ +struct test_struct___signed { + void *ptr; + long val1; + long val2; + long val3; + long val4; +} __attribute((preserve_access_index)); + +/* real layout and sizes according to test's (32-bit) BTF */ +struct test_struct___real { + unsigned int ptr; /* can't use `void *`, it is always 8 byte in BPF target */ + unsigned int val2; + unsigned long long val1; + unsigned short val3; + unsigned char val4; + unsigned char _pad; + /* total sz: 20 */ +}; + +struct test_struct___real input = { + .ptr = 0x01020304, + .val1 = 0x1020304050607080, + .val2 = 0x0a0b0c0d, + .val3 = 0xfeed, + .val4 = 0xb9, + ._pad = 0xff, /* make sure no accidental zeros are present */ +}; + +unsigned long long ptr_samesized = 0; +unsigned long long val1_samesized = 0; +unsigned long long val2_samesized = 0; +unsigned long long val3_samesized = 0; +unsigned long long val4_samesized = 0; +struct test_struct___real output_samesized = {}; + +unsigned long long ptr_downsized = 0; +unsigned long long val1_downsized = 0; +unsigned long long val2_downsized = 0; +unsigned long long val3_downsized = 0; +unsigned long long val4_downsized = 0; +struct test_struct___real output_downsized = {}; + +unsigned long long ptr_probed = 0; +unsigned long long val1_probed = 0; +unsigned long long val2_probed = 0; +unsigned long long val3_probed = 0; +unsigned long long val4_probed = 0; + +unsigned long long ptr_signed = 0; +unsigned long long val1_signed = 0; +unsigned long long val2_signed = 0; +unsigned long long val3_signed = 0; +unsigned long long val4_signed = 0; +struct test_struct___real output_signed = {}; + +SEC("raw_tp/sys_exit") +int handle_samesize(void *ctx) +{ + struct test_struct___samesize *in = (void *)&input; + struct test_struct___samesize *out = (void *)&output_samesized; + + ptr_samesized = (unsigned long long)in->ptr; + val1_samesized = in->val1; + val2_samesized = in->val2; + val3_samesized = in->val3; + val4_samesized = in->val4; + + out->ptr = in->ptr; + out->val1 = in->val1; + out->val2 = in->val2; + out->val3 = in->val3; + out->val4 = in->val4; + + return 0; +} + +SEC("raw_tp/sys_exit") +int handle_downsize(void *ctx) +{ + struct test_struct___downsize *in = (void *)&input; + struct test_struct___downsize *out = (void *)&output_downsized; + + ptr_downsized = (unsigned long long)in->ptr; + val1_downsized = in->val1; + val2_downsized = in->val2; + val3_downsized = in->val3; + val4_downsized = in->val4; + + out->ptr = in->ptr; + out->val1 = in->val1; + out->val2 = in->val2; + out->val3 = in->val3; + out->val4 = in->val4; + + return 0; +} + +SEC("raw_tp/sys_enter") +int handle_probed(void *ctx) +{ + struct test_struct___downsize *in = (void *)&input; + __u64 tmp; + + tmp = 0; + bpf_core_read(&tmp, bpf_core_field_size(in->ptr), &in->ptr); + ptr_probed = tmp; + + tmp = 0; + bpf_core_read(&tmp, bpf_core_field_size(in->val1), &in->val1); + val1_probed = tmp; + + tmp = 0; + bpf_core_read(&tmp, bpf_core_field_size(in->val2), &in->val2); + val2_probed = tmp; + + tmp = 0; + bpf_core_read(&tmp, bpf_core_field_size(in->val3), &in->val3); + val3_probed = tmp; + + tmp = 0; + bpf_core_read(&tmp, bpf_core_field_size(in->val4), &in->val4); + val4_probed = tmp; + + return 0; +} + +SEC("raw_tp/sys_enter") +int handle_signed(void *ctx) +{ + struct test_struct___signed *in = (void *)&input; + struct test_struct___signed *out = (void *)&output_signed; + + val2_signed = in->val2; + val3_signed = in->val3; + val4_signed = in->val4; + + out->val2= in->val2; + out->val3= in->val3; + out->val4= in->val4; + + return 0; +}