From patchwork Wed Jul 7 19:46:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 12363989 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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 A0058C07E95 for ; Wed, 7 Jul 2021 19:46:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8910E61CB0 for ; Wed, 7 Jul 2021 19:46:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232357AbhGGTti (ORCPT ); Wed, 7 Jul 2021 15:49:38 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:26449 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232772AbhGGTtg (ORCPT ); Wed, 7 Jul 2021 15:49:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1625687215; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XyCTtNsvJM23bTJlhCXcXFu90hTwq9G3m+Uc2FcCDhw=; b=Bh2OhR4RGO5qS0TiPtEs/I9B2eoNjXVT75srB3ukIvyjB7wLxZTyiS9TrZz/2ErMVwhmDY XpZedWmxWGggckrgr1aJ3klx0rVwnDBd2HNWQh26d+mYB1s3dFKvPFTSquAycUR7xElVte HJspj/C65LqPbI2lZWRTN/1ewsoQD1Y= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-557-3z-_NYNEO-KUeaT_H2vf0Q-1; Wed, 07 Jul 2021 15:46:54 -0400 X-MC-Unique: 3z-_NYNEO-KUeaT_H2vf0Q-1 Received: by mail-wr1-f69.google.com with SMTP id m10-20020a5d64aa0000b029013370949d6bso1140657wrp.1 for ; Wed, 07 Jul 2021 12:46:53 -0700 (PDT) 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=XyCTtNsvJM23bTJlhCXcXFu90hTwq9G3m+Uc2FcCDhw=; b=AnlN5HLKaIKhJLbODd2nt1ZKWyioMZvcOJdeCh9KuSPl3l0C94BfOVA33D4rz4CN/X ZxjW094KhKEN3Vh583WQAcVZcpNooGl8eOLJnhhXRA04laDPpo7XZi7S1fqw+dFicBfX wDyxPCvhyVVuBr29QBLz7hIn+x+ndoYl00NvFetTuGVj/zTzLrANNH0jmrXRFOChc3LE QuSX+Jt2a3YGx9MPYzlmJWzXlDppCDA7dNBL1YC6G+3NGxLIcYX7gCPSxDlr+gTIhJIC 22N4rUyMFWtX6xb1yzLlfQlFTwOON3Aq7mgYRzV5Q+Hrd05j/fE8RArveNvz7AZMOAtf 9XRg== X-Gm-Message-State: AOAM530I52Rg9YNtJi1Fk5xfDrCWnAbUoCHotxyOfbTbrG+/xK/KVn2Z N1174ZJg/IYO+0/ZKkVDTh18dbDZywjJHpJ09+2UCsdXKXZ8G+REVe8iMG6GuDeOEpKfL/LTO/W tXLgGhUOjpIRl X-Received: by 2002:a05:600c:1c8f:: with SMTP id k15mr28858768wms.91.1625687212842; Wed, 07 Jul 2021 12:46:52 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwu7rf02t2v0dKPwUDOi8KjZXmcJxl0X3f27O0ei2he77A+R1yn8AOCE2VQNGl53nogDYsQeA== X-Received: by 2002:a05:600c:1c8f:: with SMTP id k15mr28858743wms.91.1625687212688; Wed, 07 Jul 2021 12:46:52 -0700 (PDT) Received: from krava.redhat.com ([185.153.78.55]) by smtp.gmail.com with ESMTPSA id t9sm21265548wrq.92.2021.07.07.12.46.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jul 2021 12:46:52 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Alan Maguire Subject: [PATCH 4/7] bpf: Add bpf_get_func_ip helper for kprobe programs Date: Wed, 7 Jul 2021 21:46:16 +0200 Message-Id: <20210707194619.151676-5-jolsa@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210707194619.151676-1-jolsa@kernel.org> References: <20210707194619.151676-1-jolsa@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Adding bpf_get_func_ip helper for BPF_PROG_TYPE_KPROBE programs, so it's now possible to call bpf_get_func_ip from both kprobe and kretprobe programs. Taking the caller's address from 'struct kprobe::addr', which is defined for both kprobe and kretprobe. Signed-off-by: Jiri Olsa --- include/uapi/linux/bpf.h | 2 +- kernel/bpf/verifier.c | 2 ++ kernel/trace/bpf_trace.c | 17 +++++++++++++++++ tools/include/uapi/linux/bpf.h | 2 +- 4 files changed, 21 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 83e87ffdbb6e..4894f99a1993 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -4783,7 +4783,7 @@ union bpf_attr { * * u64 bpf_get_func_ip(void *ctx) * Description - * Get address of the traced function (for tracing programs). + * Get address of the traced function (for tracing and kprobe programs). * Return * Address of the traced function. */ diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index f975a3aa9368..79eb9d81a198 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -5979,6 +5979,8 @@ static int has_get_func_ip(struct bpf_verifier_env *env) return -ENOTSUPP; } return 0; + } else if (type == BPF_PROG_TYPE_KPROBE) { + return 0; } verbose(env, "func %s#%d not supported for program type %d\n", diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 9edd3b1a00ad..55acf56b0c3a 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -17,6 +17,7 @@ #include #include #include +#include #include @@ -961,6 +962,20 @@ static const struct bpf_func_proto bpf_get_func_ip_proto_tracing = { .arg1_type = ARG_PTR_TO_CTX, }; +BPF_CALL_1(bpf_get_func_ip_kprobe, struct pt_regs *, regs) +{ + struct kprobe *kp = kprobe_running(); + + return kp ? (u64) kp->addr : 0; +} + +static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe = { + .func = bpf_get_func_ip_kprobe, + .gpl_only = true, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, +}; + const struct bpf_func_proto * bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) { @@ -1092,6 +1107,8 @@ kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) case BPF_FUNC_override_return: return &bpf_override_return_proto; #endif + case BPF_FUNC_get_func_ip: + return &bpf_get_func_ip_proto_kprobe; default: return bpf_tracing_func_proto(func_id, prog); } diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 83e87ffdbb6e..4894f99a1993 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -4783,7 +4783,7 @@ union bpf_attr { * * u64 bpf_get_func_ip(void *ctx) * Description - * Get address of the traced function (for tracing programs). + * Get address of the traced function (for tracing and kprobe programs). * Return * Address of the traced function. */