From mboxrd@z Thu Jan 1 00:00:00 1970 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 1248DCCA483 for ; Tue, 7 Jun 2022 22:42:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383530AbiFGWkr (ORCPT ); Tue, 7 Jun 2022 18:40:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378037AbiFGV1K (ORCPT ); Tue, 7 Jun 2022 17:27:10 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08D66228F58; Tue, 7 Jun 2022 12:02:07 -0700 (PDT) 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 DCD1961787; Tue, 7 Jun 2022 19:02:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E59FBC385A2; Tue, 7 Jun 2022 19:02:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654628526; bh=YmN4V4yALByetjoXbl5eqlLA/g/d1ZKfNiLnROwqz3k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nTh64IONyhJyhQABu0u5fViMtdx550FSXrU4IeY0V3s3XCpJrFym2SIgUDUi/6rbM xj6E4nBZ8yqRM4QqXuNeM/hGpVA5IW5kwViteKMQCOTP39jvVxld8MXN0bRt8p6YpG nOZ1gFNOa6S7INUsPM829z+Er9yqrx6mAhoCeO9U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrii Nakryiko , Alexei Starovoitov , Sasha Levin Subject: [PATCH 5.18 360/879] libbpf: Fix logic for finding matching program for CO-RE relocation Date: Tue, 7 Jun 2022 18:57:58 +0200 Message-Id: <20220607165013.313188641@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607165002.659942637@linuxfoundation.org> References: <20220607165002.659942637@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrii Nakryiko [ Upstream commit 966a7509325395c51c5f6d89e7352b0585e4804b ] Fix the bug in bpf_object__relocate_core() which can lead to finding invalid matching BPF program when processing CO-RE relocation. IF matching program is not found, last encountered program will be assumed to be correct program and thus error detection won't detect the problem. Fixes: 9c82a63cf370 ("libbpf: Fix CO-RE relocs against .text section") Signed-off-by: Andrii Nakryiko Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20220426004511.2691730-4-andrii@kernel.org Signed-off-by: Sasha Levin --- tools/lib/bpf/libbpf.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 7af6805a863d..881ea905ca81 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -5646,9 +5646,10 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path) */ prog = NULL; for (i = 0; i < obj->nr_programs; i++) { - prog = &obj->programs[i]; - if (strcmp(prog->sec_name, sec_name) == 0) + if (strcmp(obj->programs[i].sec_name, sec_name) == 0) { + prog = &obj->programs[i]; break; + } } if (!prog) { pr_warn("sec '%s': failed to find a BPF program\n", sec_name); -- 2.35.1