From patchwork Tue Apr 18 12:21:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 13215635 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 A1CDBC7EE24 for ; Tue, 18 Apr 2023 12:25:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231345AbjDRMZK (ORCPT ); Tue, 18 Apr 2023 08:25:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231182AbjDRMZJ (ORCPT ); Tue, 18 Apr 2023 08:25:09 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFD9E7A81; Tue, 18 Apr 2023 05:24:46 -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 41EC763108; Tue, 18 Apr 2023 12:24:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DB08C433D2; Tue, 18 Apr 2023 12:24:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681820685; bh=COtBPWd792pj4wDo6QCmYmv27EpEeD8uoH4fJakfhLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PDnXTZoIfZDWsn1a4ZXCGbl704I9f90/EgCmUmRWSAnloQZn5ogYlpybVhKuze3hX 6vuAn/WbtaoZTuD9b1gapSXZebyH3N4dP+ckhqLujll4hENYBHkkbZxKg+jAHfDNXt jv66q/Q6DRTrJ9nWZLXinlnNEPsfRTgPkUU8zlrc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Robbie Harwood , David Howells , Jarkko Sakkinen , Eric Biederman , Herbert Xu , keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, kexec@lists.infradead.org, Sasha Levin Subject: [PATCH 4.14 30/37] verify_pefile: relax wrapper length check Date: Tue, 18 Apr 2023 14:21:40 +0200 Message-Id: <20230418120255.753919976@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230418120254.687480980@linuxfoundation.org> References: <20230418120254.687480980@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: keyrings@vger.kernel.org From: Robbie Harwood [ Upstream commit 4fc5c74dde69a7eda172514aaeb5a7df3600adb3 ] The PE Format Specification (section "The Attribute Certificate Table (Image Only)") states that `dwLength` is to be rounded up to 8-byte alignment when used for traversal. Therefore, the field is not required to be an 8-byte multiple in the first place. Accordingly, pesign has not performed this alignment since version 0.110. This causes kexec failure on pesign'd binaries with "PEFILE: Signature wrapper len wrong". Update the comment and relax the check. Signed-off-by: Robbie Harwood Signed-off-by: David Howells cc: Jarkko Sakkinen cc: Eric Biederman cc: Herbert Xu cc: keyrings@vger.kernel.org cc: linux-crypto@vger.kernel.org cc: kexec@lists.infradead.org Link: https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#the-attribute-certificate-table-image-only Link: https://github.com/rhboot/pesign Link: https://lore.kernel.org/r/20230220171254.592347-2-rharwood@redhat.com/ # v2 Signed-off-by: Sasha Levin --- crypto/asymmetric_keys/verify_pefile.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/crypto/asymmetric_keys/verify_pefile.c b/crypto/asymmetric_keys/verify_pefile.c index d178650fd524c..411977947adbe 100644 --- a/crypto/asymmetric_keys/verify_pefile.c +++ b/crypto/asymmetric_keys/verify_pefile.c @@ -139,11 +139,15 @@ static int pefile_strip_sig_wrapper(const void *pebuf, pr_debug("sig wrapper = { %x, %x, %x }\n", wrapper.length, wrapper.revision, wrapper.cert_type); - /* Both pesign and sbsign round up the length of certificate table - * (in optional header data directories) to 8 byte alignment. + /* sbsign rounds up the length of certificate table (in optional + * header data directories) to 8 byte alignment. However, the PE + * specification states that while entries are 8-byte aligned, this is + * not included in their length, and as a result, pesign has not + * rounded up since 0.110. */ - if (round_up(wrapper.length, 8) != ctx->sig_len) { - pr_debug("Signature wrapper len wrong\n"); + if (wrapper.length > ctx->sig_len) { + pr_debug("Signature wrapper bigger than sig len (%x > %x)\n", + ctx->sig_len, wrapper.length); return -ELIBBAD; } if (wrapper.revision != WIN_CERT_REVISION_2_0) {