From patchwork Thu Jul 8 07:10:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Axtens X-Patchwork-Id: 1502125 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=skiboot-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=axtens.net header.i=@axtens.net header.a=rsa-sha256 header.s=google header.b=Be7XF5+n; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4GL6tm2NLRz9sWc for ; Thu, 8 Jul 2021 17:12:32 +1000 (AEST) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4GL6tm1Gxcz3bjr for ; Thu, 8 Jul 2021 17:12:32 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=axtens.net header.i=@axtens.net header.a=rsa-sha256 header.s=google header.b=Be7XF5+n; dkim-atps=neutral X-Original-To: skiboot@lists.ozlabs.org Delivered-To: skiboot@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=axtens.net (client-ip=2607:f8b0:4864:20::429; helo=mail-pf1-x429.google.com; envelope-from=dja@axtens.net; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=axtens.net header.i=@axtens.net header.a=rsa-sha256 header.s=google header.b=Be7XF5+n; dkim-atps=neutral Received: from mail-pf1-x429.google.com (mail-pf1-x429.google.com [IPv6:2607:f8b0:4864:20::429]) (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 lists.ozlabs.org (Postfix) with ESMTPS id 4GL6tc16wwz3bYS for ; Thu, 8 Jul 2021 17:12:24 +1000 (AEST) Received: by mail-pf1-x429.google.com with SMTP id w22so4645259pff.5 for ; Thu, 08 Jul 2021 00:12:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=axtens.net; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=DcvfjNsHLhSPUUBsx+5SUVgMapPvJSr8g6iSwiJ8cYY=; b=Be7XF5+nLRWCZ/s5cjV6hJMywsX7TixHZ8AWppWD/ENiLjJKUKxU/TiyrqAYw+cWta 0rWre3ft5XyiDk58rnzPO6vHrZLGrLGxBR4PlIGQFRvSAvjEA8LBZIXGOvdq5KnBrCdv LyCdXl8PCF0SXc93YXTxmxUql3jOYFskSqvec= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DcvfjNsHLhSPUUBsx+5SUVgMapPvJSr8g6iSwiJ8cYY=; b=SUvZkyi3p3PRT9yv8P5ZXNB50DHH0y7NMpGgOmHzgibmB5++th5o1UPUMUy9k1kMMw 8iRbo6UUL85glIB8estci2eDkXCBat4EtXjwKUaMs42CSsfLPLXD1anpFK41gu9Mplzi RTEux5hTE7WDr4iJJ+twcq8VcArbq1IpmGV2aDIeFBxlaYnTppoKvgaqr7+HVSolv1O1 pLX6F0XH8ttiRQJPual4WVbmImBh8keo9WdOy4lKmQZqxhv4rsmXvkrwYws2RthLYyZi c4zaJuXlHWJp6D0W0V/vLeLYwAB/rgDr54Iu6r+j5avZyS5bVTmvJjSTo6B28+Cfg0VY IcKA== X-Gm-Message-State: AOAM5336VyYLvohbrV/dY19X7pDR467/1wqlQuaBpQWlIN8MIcIr94z0 0CnF7gh42TWirYS1/x/78rIUVP3JyBR+Aw== X-Google-Smtp-Source: ABdhPJyx5mttBPt9l+yxwHaw7Nos1vCu4oikKRiuYx9CmCgEtMqUeGelIY8hgTd5cKUdVjRrFT5LaQ== X-Received: by 2002:a05:6a00:26d6:b029:31e:45e7:56d0 with SMTP id p22-20020a056a0026d6b029031e45e756d0mr21352256pfw.40.1625728341313; Thu, 08 Jul 2021 00:12:21 -0700 (PDT) Received: from localhost ([203.206.29.204]) by smtp.gmail.com with ESMTPSA id w22sm1631741pfq.83.2021.07.08.00.12.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jul 2021 00:12:20 -0700 (PDT) From: Daniel Axtens To: skiboot@lists.ozlabs.org Date: Thu, 8 Jul 2021 17:10:36 +1000 Message-Id: <20210708071040.3684854-4-dja@axtens.net> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210708071040.3684854-1-dja@axtens.net> References: <20210708071040.3684854-1-dja@axtens.net> MIME-Version: 1.0 Subject: [Skiboot] [PATCH v2 3/7] secvar/backend: fix an integer underflow bug X-BeenThere: skiboot@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Mailing list for skiboot development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nick.child@ibm.com, nayna@linux.ibm.com Errors-To: skiboot-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Skiboot" If a declared size is smaller than uuid size, we end up allocating with an allocation of a 'negative' number, which is a huge 64 bit number. This will probably then fail with an OPAL_NO_MEM, but it will be better to catch it and return OPAL_PARAMETER instead. Signed-off-by: Daniel Axtens --- libstb/secvar/backend/edk2-compat-process.c | 3 + libstb/secvar/test/data/KEKeslcorrupt.h | 161 +++++++++++++++++++ libstb/secvar/test/secvar-test-edk2-compat.c | 18 +++ 3 files changed, 182 insertions(+) create mode 100644 libstb/secvar/test/data/KEKeslcorrupt.h diff --git a/libstb/secvar/backend/edk2-compat-process.c b/libstb/secvar/backend/edk2-compat-process.c index ab8efd9b2573..edbb588899c8 100644 --- a/libstb/secvar/backend/edk2-compat-process.c +++ b/libstb/secvar/backend/edk2-compat-process.c @@ -128,6 +128,9 @@ static int get_esl_cert(const char *buf, const size_t buflen, char **cert) assert(cert != NULL); + if (le32_to_cpu(list->SignatureSize) <= sizeof(uuid_t)) + return OPAL_PARAMETER; + size = le32_to_cpu(list->SignatureSize) - sizeof(uuid_t); prlog(PR_DEBUG,"size of signature list size is %u\n", diff --git a/libstb/secvar/test/data/KEKeslcorrupt.h b/libstb/secvar/test/data/KEKeslcorrupt.h new file mode 100644 index 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run_test() ASSERT(0 == tmp->data_size); free(data); + /* KEK with corrupted ESL SignatureSize */ + printf("KEK with corrupt ESL SignatureSize\n"); + tmp = new_secvar("KEK", 4, KEKeslcorrupt_auth, KEKeslcorrupt_auth_len, 0); + ASSERT(0 == edk2_compat_validate(tmp)); + list_add_tail(&update_bank, &tmp->link); + ASSERT(1 == list_length(&update_bank)); + + rc = edk2_compat_process(&variable_bank, &update_bank); + /* If we don't catch the error, we get OPAL_NO_MEM instead */ + ASSERT(OPAL_PARAMETER == rc); + ASSERT(5 == list_length(&variable_bank)); + ASSERT(0 == list_length(&update_bank)); + tmp = find_secvar("KEK", 4, &variable_bank); + ASSERT(NULL != tmp); + ASSERT(0 == tmp->data_size); + + /* Add valid KEK, .process(), succeeds. */ printf("Add KEK"); tmp = new_secvar("KEK", 4, KEK_auth, KEK_auth_len, 0);