From patchwork Tue Feb 28 09:31:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 13154592 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 D97D2C7EE30 for ; Tue, 28 Feb 2023 09:32:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229756AbjB1Jcp (ORCPT ); Tue, 28 Feb 2023 04:32:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231331AbjB1Jcl (ORCPT ); Tue, 28 Feb 2023 04:32:41 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 625D5211F6; Tue, 28 Feb 2023 01:32:40 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id F386860FFC; Tue, 28 Feb 2023 09:32:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 532EFC4339C; Tue, 28 Feb 2023 09:32:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1677576759; bh=KVeSwjr1MM70r3HIU41SsfKM/mZY7sGzW/FlWf73V/s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HBaS3gT21KO0nsyCT8FwE/BIVPSrUUAxD9WbcMeJSMhx+MPsx2OXhehXjktvVQ9SF kgJTVUP2drmveFEQk744dTA34D7L/FR0tCswjY48qD3gZLezBwpxEZdaAKZUfEV9E8 puKhKdldF5sCccw/H2cmBkC1DcvkyZ0EPz3U9fIMjXlUn7pqlNJ4oKgcBkNiYoOlta cVp0OrKcyhSKGCigtDHHEBTfcJIn3NdplKyAHXX+250Ogh4BZ5UuwAz7T0/68WfyFW ib8w3H4K5cOCX3dNnQvhTkO039M+djRYVP/majEBXvugWcRXiA6lq1snRVqbeG+RoZ mhHeZuGdkPo5w== From: Jiri Olsa To: Alexei Starovoitov , Andrii Nakryiko , Hao Luo , Andrew Morton , Alexander Viro , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Matthew Wilcox Cc: bpf@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-perf-users@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Daniel Borkmann , Namhyung Kim Subject: [PATCH RFC v2 bpf-next 2/9] bpf: Use file's inode object build id in stackmap Date: Tue, 28 Feb 2023 10:31:59 +0100 Message-Id: <20230228093206.821563-3-jolsa@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230228093206.821563-1-jolsa@kernel.org> References: <20230228093206.821563-1-jolsa@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Use build id from file's inode object in stackmap if it's available. Signed-off-by: Jiri Olsa --- kernel/bpf/stackmap.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c index aecea7451b61..9b9578e0cada 100644 --- a/kernel/bpf/stackmap.c +++ b/kernel/bpf/stackmap.c @@ -124,6 +124,28 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr) return ERR_PTR(err); } +#ifdef CONFIG_INODE_BUILD_ID +static int vma_get_build_id(struct vm_area_struct *vma, unsigned char *build_id) +{ + struct build_id *bid; + + if (!vma->vm_file) + return -EINVAL; + bid = file_inode(vma->vm_file)->i_build_id; + if (IS_ERR_OR_NULL(bid)) + return bid ? PTR_ERR(bid) : -ENOENT; + if (bid->sz > BUILD_ID_SIZE_MAX) + return -EINVAL; + memcpy(build_id, bid->data, bid->sz); + return 0; +} +#else +static int vma_get_build_id(struct vm_area_struct *vma, unsigned char *build_id) +{ + return build_id_parse(vma, build_id, NULL); +} +#endif + static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs, u64 *ips, u32 trace_nr, bool user) { @@ -156,7 +178,7 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs, goto build_id_valid; } vma = find_vma(current->mm, ips[i]); - if (!vma || build_id_parse(vma, id_offs[i].build_id, NULL)) { + if (!vma || vma_get_build_id(vma, id_offs[i].build_id)) { /* per entry fall back to ips */ id_offs[i].status = BPF_STACK_BUILD_ID_IP; id_offs[i].ip = ips[i];