From patchwork Tue Jun 20 08:35:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13285335 X-Patchwork-Delegate: bpf@iogearbox.net Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A95D1AD56 for ; Tue, 20 Jun 2023 08:36:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED4D5C433C0; Tue, 20 Jun 2023 08:36:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1687250194; bh=ZO8e7ZUuCYow+86JgR3lAD3XBHgd7dwTCkhXMwpkdsU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vPs+BE0+DzQpAZZv+vgAs2X8p6zccoH+rGAvG1gt7hVnK8zynSUy9gAMHiJviODYC dutVAXQjBX3WSGvih5IJKicSBHm1Ajvq8iRhMATt2gtrA/wrK8/G1NDVilkH+BSmNY NCur1aZ2rqc+rqjrQbopzcPN0H51tfhygTJn38xWnddQJdSjSIzb8Z9HjHkqZLLgxy lPstbAMK1IlD+3Lazy6MVR5ffiT525xKKwewsKWFSrhh3zmQ1TsVeVg+LpQb+8WmHD cE+tEtTwAMgmOgHtJKD5rJnIsEE9BAbq7Pugkz43RVHV0HheX69plWEvgNreY1kVL7 MzPu5Ghj/NzMA== From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo Subject: [PATCHv2 bpf-next 04/24] bpf: Add bpf_get_func_ip helper support for uprobe link Date: Tue, 20 Jun 2023 10:35:30 +0200 Message-ID: <20230620083550.690426-5-jolsa@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230620083550.690426-1-jolsa@kernel.org> References: <20230620083550.690426-1-jolsa@kernel.org> 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 Adding support for bpf_get_func_ip helper being called from ebpf program attached by uprobe_multi link. It returns the ip of the uprobe. Acked-by: Andrii Nakryiko Signed-off-by: Jiri Olsa --- kernel/trace/bpf_trace.c | 33 ++++++++++++++++++++++++++++++--- 1 file changed, 30 insertions(+), 3 deletions(-) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 5c5b543d7d03..dfba0bb479a2 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -88,6 +88,7 @@ static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx); static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx); static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx); +static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx); /** * trace_call_bpf - invoke BPF program @@ -1091,6 +1092,18 @@ static const struct bpf_func_proto bpf_get_attach_cookie_proto_kmulti = { .arg1_type = ARG_PTR_TO_CTX, }; +BPF_CALL_1(bpf_get_func_ip_uprobe_multi, struct pt_regs *, regs) +{ + return bpf_uprobe_multi_entry_ip(current->bpf_ctx); +} + +static const struct bpf_func_proto bpf_get_func_ip_proto_uprobe_multi = { + .func = bpf_get_func_ip_uprobe_multi, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, +}; + BPF_CALL_1(bpf_get_attach_cookie_uprobe_multi, struct pt_regs *, regs) { return bpf_uprobe_multi_cookie(current->bpf_ctx); @@ -1545,9 +1558,11 @@ kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_override_return_proto; #endif case BPF_FUNC_get_func_ip: - return prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI ? - &bpf_get_func_ip_proto_kprobe_multi : - &bpf_get_func_ip_proto_kprobe; + if (prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI) + return &bpf_get_func_ip_proto_kprobe_multi; + if (prog->expected_attach_type == BPF_TRACE_UPROBE_MULTI) + return &bpf_get_func_ip_proto_uprobe_multi; + return &bpf_get_func_ip_proto_kprobe; case BPF_FUNC_get_attach_cookie: if (prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI) return &bpf_get_attach_cookie_proto_kmulti; @@ -3061,6 +3076,14 @@ uprobe_multi_link_ret_handler(struct uprobe_consumer *con, unsigned long func, s return uprobe_prog_run(uprobe, func, regs); } +static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) +{ + struct bpf_uprobe_multi_run_ctx *run_ctx; + + run_ctx = container_of(current->bpf_ctx, struct bpf_uprobe_multi_run_ctx, run_ctx); + return run_ctx->entry_ip; +} + static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx) { struct bpf_uprobe_multi_run_ctx *run_ctx; @@ -3221,4 +3244,8 @@ static u64 bpf_uprobe_multi_cookie(struct bpf_run_ctx *ctx) { return 0; } +static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_ctx *ctx) +{ + return 0; +} #endif /* CONFIG_UPROBES */