From patchwork Thu Oct 5 15:38:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jo Van Bulck X-Patchwork-Id: 13410380 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 6D623E7AD44 for ; Thu, 5 Oct 2023 16:16:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240543AbjJEQPq (ORCPT ); Thu, 5 Oct 2023 12:15:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36116 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240861AbjJEQOH (ORCPT ); Thu, 5 Oct 2023 12:14:07 -0400 Received: from icts-p-cavuit-3.kulnet.kuleuven.be (icts-p-cavuit-3.kulnet.kuleuven.be [134.58.240.133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1608B2C287; Thu, 5 Oct 2023 08:39:04 -0700 (PDT) X-KULeuven-Envelope-From: jo.vanbulck@cs.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: E614A20052.A8F73 X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-ceifnet-smtps-1.kuleuven.be (icts-p-ceifnet-smtps.service.icts.svcd [IPv6:2a02:2c40:0:51:213:242:ac11:64]) by icts-p-cavuit-3.kulnet.kuleuven.be (Postfix) with ESMTP id E614A20052; Thu, 5 Oct 2023 17:38:59 +0200 (CEST) BCmilterd-Mark-Subject: no BCmilterd-Errors: BCmilterd-Report: SA-HVU#DKIM_VALID#0.00,SA-HVU#DKIM_SIGNED#0.00,SA-HVU#DKIM_VALID_AU#0.00,SA-HVU#OURIPS#-35.00 X-CAV-Cluster: smtps DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cs.kuleuven.be; s=cav; t=1696520339; bh=BlYdRr32xxxqfktzP+vlGnAtIlq3iaZb2FkzpNho4RU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=NsrzLZIvKDVW64ti2b9bCgqmSt1V8BZwkfdiNoFW+XLpqhKdF8VXSgl4pp2x/75LH 3BhQX88eSKbbv3H0zu3QnzXAgFwboWZVm6HN1wX1i+XGZV1ES5ixnk21fyX+PIYm5l owpaoPmIfDw5xkLSXOdEHYB4Gqz4BhJimPZpiwWA= Received: from librem.dyn.cs.kuleuven.be (unknown [IPv6:2a02:2c40:500:a006:548e:e4dd:76a4:afd8]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by icts-p-ceifnet-smtps-1.kuleuven.be (Postfix) with ESMTPSA id BDD0FD4F34F1A; Thu, 5 Oct 2023 17:38:59 +0200 (CEST) X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Jo Van Bulck To: jarkko@kernel.org, kai.huang@intel.com, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org Cc: dave.hansen@linux.intel.com, Jo Van Bulck Subject: [PATCH v7 02/13] selftests/sgx: Fix uninitialized pointer dereferences in encl_get_entry Date: Thu, 5 Oct 2023 17:38:43 +0200 Message-Id: <20231005153854.25566-3-jo.vanbulck@cs.kuleuven.be> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231005153854.25566-1-jo.vanbulck@cs.kuleuven.be> References: <20231005153854.25566-1-jo.vanbulck@cs.kuleuven.be> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org Ensure sym_tab and sym_names are zero-initialized and add an early-out condition in the unlikely (erroneous) case that the enclave ELF file would not contain a symbol table. This addresses -Werror=maybe-uninitialized compiler warnings for gcc -O2. Fixes: 33c5aac3bf32 ("selftests/sgx: Test complete changing of page type flow") Signed-off-by: Jo Van Bulck Reviewed-by: Jarkko Sakkinen --- tools/testing/selftests/sgx/load.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/sgx/load.c b/tools/testing/selftests/sgx/load.c index 94bdeac1cf04..c9f658e44de6 100644 --- a/tools/testing/selftests/sgx/load.c +++ b/tools/testing/selftests/sgx/load.c @@ -136,11 +136,11 @@ static bool encl_ioc_add_pages(struct encl *encl, struct encl_segment *seg) */ uint64_t encl_get_entry(struct encl *encl, const char *symbol) { + Elf64_Sym *symtab = NULL; + char *sym_names = NULL; Elf64_Shdr *sections; - Elf64_Sym *symtab; Elf64_Ehdr *ehdr; - char *sym_names; - int num_sym; + int num_sym = 0; int i; ehdr = encl->bin; @@ -161,6 +161,9 @@ uint64_t encl_get_entry(struct encl *encl, const char *symbol) } } + if (!symtab || !sym_names) + return 0; + for (i = 0; i < num_sym; i++) { Elf64_Sym *sym = &symtab[i];