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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0811DC4167B for ; Wed, 3 Nov 2021 14:27:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E57256103C for ; Wed, 3 Nov 2021 14:27:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232101AbhKCO3x (ORCPT ); Wed, 3 Nov 2021 10:29:53 -0400 Received: from smtp-out2.suse.de ([195.135.220.29]:52392 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231386AbhKCO3u (ORCPT ); Wed, 3 Nov 2021 10:29:50 -0400 Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 96E731FC9E; Wed, 3 Nov 2021 14:27:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1635949632; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mHRKGzOrFJY3TXPZxndVRyVPBDcEQsDOTrGLk8iE6xA=; b=wceayes8F/OBx1HLTE/AmGHLsenXO/zk5kdFt9Rs1VRCCqLO8JV0Tq/2o8hXtjQRHnON/X 8hcXsORG/u+0hu720yTPL/1zMTJBUEWIEwOnpy3LuoZDjOE9w7YhTG68qFz6EalQKtF+zo 9oHI0CDlurO6wG3XHipzpfuq2P4PxP4= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1635949632; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mHRKGzOrFJY3TXPZxndVRyVPBDcEQsDOTrGLk8iE6xA=; b=hTjEF6AILKkdWduND5hj6YcCUfaugglzhjlvFNm9dwEvyEZYZ6uGckzpMOhXNlEWDOLQge Uq57flcqM5CHmPAw== Received: from kitsune.suse.cz (kitsune.suse.cz [10.100.12.127]) by relay2.suse.de (Postfix) with ESMTP id 6FE91A3BA0; Wed, 3 Nov 2021 14:27:12 +0000 (UTC) From: Michal Suchanek To: keyrings@vger.kernel.org Cc: Michal Suchanek , Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Alexander Gordeev , David Howells , Luis Chamberlain , Jessica Yu , Rob Herring , Lakshmi Ramasubramanian , Thiago Jung Bauermann , Hari Bathini , Frank van der Linden , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH 1/3] s390/kexec_file: Don't opencode appended signature verification. Date: Wed, 3 Nov 2021 15:27:06 +0100 Message-Id: <90b0c526962c7c835efddeaf5d70f6f5962287e0.1635948742.git.msuchanek@suse.de> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Module verification already implements appeded signature verification. Reuse it for kexec_file. Signed-off-by: Michal Suchanek --- arch/s390/kernel/machine_kexec_file.c | 33 ++++----------------------- include/linux/verification.h | 3 +++ kernel/module-internal.h | 2 -- kernel/module.c | 4 +++- kernel/module_signing.c | 24 +++++++++++-------- 5 files changed, 25 insertions(+), 41 deletions(-) diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c index f9e4baa64b67..634e641cd8aa 100644 --- a/arch/s390/kernel/machine_kexec_file.c +++ b/arch/s390/kernel/machine_kexec_file.c @@ -23,11 +23,10 @@ const struct kexec_file_ops * const kexec_file_loaders[] = { }; #ifdef CONFIG_KEXEC_SIG -int s390_verify_sig(const char *kernel, unsigned long kernel_len) +int s390_verify_sig(const char *kernel, unsigned long length) { + size_t kernel_len = length; const unsigned long marker_len = sizeof(MODULE_SIG_STRING) - 1; - struct module_signature *ms; - unsigned long sig_len; /* Skip signature verification when not secure IPLed. */ if (!ipl_secure_flag) @@ -41,32 +40,8 @@ int s390_verify_sig(const char *kernel, unsigned long kernel_len) return -EKEYREJECTED; kernel_len -= marker_len; - ms = (void *)kernel + kernel_len - sizeof(*ms); - kernel_len -= sizeof(*ms); - - sig_len = be32_to_cpu(ms->sig_len); - if (sig_len >= kernel_len) - return -EKEYREJECTED; - kernel_len -= sig_len; - - if (ms->id_type != PKEY_ID_PKCS7) - return -EKEYREJECTED; - - if (ms->algo != 0 || - ms->hash != 0 || - ms->signer_len != 0 || - ms->key_id_len != 0 || - ms->__pad[0] != 0 || - ms->__pad[1] != 0 || - ms->__pad[2] != 0) { - return -EBADMSG; - } - - return verify_pkcs7_signature(kernel, kernel_len, - kernel + kernel_len, sig_len, - VERIFY_USE_PLATFORM_KEYRING, - VERIFYING_MODULE_SIGNATURE, - NULL, NULL); + return verify_appended_signature(kernel, &kernel_len, VERIFY_USE_PLATFORM_KEYRING, + "kexec_file"); } #endif /* CONFIG_KEXEC_SIG */ diff --git a/include/linux/verification.h b/include/linux/verification.h index a655923335ae..c1cf0582012a 100644 --- a/include/linux/verification.h +++ b/include/linux/verification.h @@ -60,5 +60,8 @@ extern int verify_pefile_signature(const void *pebuf, unsigned pelen, enum key_being_used_for usage); #endif +int verify_appended_signature(const void *data, size_t *len, struct key *trusted_keys, + const char *what); + #endif /* CONFIG_SYSTEM_DATA_VERIFICATION */ #endif /* _LINUX_VERIFY_PEFILE_H */ diff --git a/kernel/module-internal.h b/kernel/module-internal.h index 33783abc377b..80461e14bf29 100644 --- a/kernel/module-internal.h +++ b/kernel/module-internal.h @@ -27,5 +27,3 @@ struct load_info { unsigned int sym, str, mod, vers, info, pcpu; } index; }; - -extern int mod_verify_sig(const void *mod, struct load_info *info); diff --git a/kernel/module.c b/kernel/module.c index 5c26a76e800b..137b3661be75 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -57,6 +57,7 @@ #include #include #include +#include #include #include "module-internal.h" @@ -2894,7 +2895,8 @@ static int module_sig_check(struct load_info *info, int flags) memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { /* We truncate the module to discard the signature */ info->len -= markerlen; - err = mod_verify_sig(mod, info); + err = verify_appended_signature(mod, &info->len, + VERIFY_USE_SECONDARY_KEYRING, "module"); if (!err) { info->sig_ok = true; return 0; diff --git a/kernel/module_signing.c b/kernel/module_signing.c index 8723ae70ea1f..f492e410564d 100644 --- a/kernel/module_signing.c +++ b/kernel/module_signing.c @@ -14,13 +14,19 @@ #include #include "module-internal.h" -/* - * Verify the signature on a module. +/** + * verify_appended_signature - Verify the signature on a module with the + * signature marker stripped. + * @data: The data to be verified + * @len: Size of @data. + * @trusted_keys: Keyring to use for verification + * @what: Informational string for log messages */ -int mod_verify_sig(const void *mod, struct load_info *info) +int verify_appended_signature(const void *data, size_t *len, + struct key *trusted_keys, const char *what) { struct module_signature ms; - size_t sig_len, modlen = info->len; + size_t sig_len, modlen = *len; int ret; pr_devel("==>%s(,%zu)\n", __func__, modlen); @@ -28,18 +34,18 @@ int mod_verify_sig(const void *mod, struct load_info *info) if (modlen <= sizeof(ms)) return -EBADMSG; - memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms)); + memcpy(&ms, data + (modlen - sizeof(ms)), sizeof(ms)); - ret = mod_check_sig(&ms, modlen, "module"); + ret = mod_check_sig(&ms, modlen, what); if (ret) return ret; sig_len = be32_to_cpu(ms.sig_len); modlen -= sig_len + sizeof(ms); - info->len = modlen; + *len = modlen; - return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len, - VERIFY_USE_SECONDARY_KEYRING, + return verify_pkcs7_signature(data, modlen, data + modlen, sig_len, + trusted_keys, VERIFYING_MODULE_SIGNATURE, NULL, NULL); } -- 2.31.1