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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 08F69C77B76 for ; Tue, 18 Apr 2023 12:45:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=B8sUBUfdnVrWmTCaKhdWZsUvm/X1AOuKoVTM0wE6mN8=; b=N64DoVP7i3vHTh 1R+M0eRaUYU06J1PyYrGlpRNFuI0aYdGi3Nqe3mONJyAMlXHtWRyq0E4E9zUuPyK/8zT8HmTJJEmh iuwEclIhzyzlM9vZZxQQvKUCOQK/nig+91FstE6DxIsAsHY3mSLXZx2Rq7q4D1K4U5R9OyT3gihDq GATNC/aTF4DyhXl3JwBJD5RIghVtcxXmm6EzQUja+/RCLVQ1ybZ+sVwJIxVklTsSfD5frMtdJE/qV obWbOp7Kx1tXWA47nmvWR8MW62LhjCttUg3jjrJntJgFJDOluaKxMY1kUokU7YIk6Psj4RtGJNFJZ 7RRZMfxQdjcYZiEIjpvQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pokhn-002ALl-2P; Tue, 18 Apr 2023 12:45:07 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pokhk-002AKx-1A for kexec@lists.infradead.org; Tue, 18 Apr 2023 12:45:05 +0000 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 DA3AD63388; Tue, 18 Apr 2023 12:45:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC503C433D2; Tue, 18 Apr 2023 12:45:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681821902; bh=VCwMMj2q4qUoHuODRqKDgoLte/T7yupow6Vv8LVr/gY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C3ZdMJ3Acf4tyOgO6xVmTpZyM+ghvOpLqWvY9Qe2Tie3YgzfzSI172LFA1900nDrd axIrzPvU/bnLWz4FYz12iLxkf7vjTIgydWHPF8/HIcpwdkeaAhOgt4kRKzOuuz8CdR FKRN02jFf7KycXBjh2YQIPdQxoEssXh1aCoIiz2w= 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 6.1 085/134] verify_pefile: relax wrapper length check Date: Tue, 18 Apr 2023 14:22:21 +0200 Message-Id: <20230418120316.085342872@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230418120313.001025904@linuxfoundation.org> References: <20230418120313.001025904@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230418_054504_480730_C66D668F X-CRM114-Status: GOOD ( 14.88 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.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 7553ab18db898..fe1bb374239d7 100644 --- a/crypto/asymmetric_keys/verify_pefile.c +++ b/crypto/asymmetric_keys/verify_pefile.c @@ -135,11 +135,15 @@ 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) { -- 2.39.2 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec