From patchwork Fri Jan 27 20:12:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rae Moar X-Patchwork-Id: 648795 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 5E4DDC38142 for ; Fri, 27 Jan 2023 20:12:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229737AbjA0UMo (ORCPT ); Fri, 27 Jan 2023 15:12:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59412 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229606AbjA0UMn (ORCPT ); Fri, 27 Jan 2023 15:12:43 -0500 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 908D32100 for ; Fri, 27 Jan 2023 12:12:42 -0800 (PST) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-5066df312d7so66539457b3.0 for ; Fri, 27 Jan 2023 12:12:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=U5PweF5Md6NbIdnNvsH2BayzCnZUUA5GzHDCZFW7bFw=; b=ONWctdoEud7qQ4B99HG3h//Nh6GFQlodrwLFPGz7gXjP/o0pmC2lz/qXuJQsiAbwzm SxXvQaEy5uFk4g8C8Ye8SoZfrkZniuArrj65jPMjByR+bJNLMuQLqllZTO/xvgSAMAUc bhHbrtseaiyH7TspyFJj83HWGtNFn0r1BrpHVv71Nalq3rIuVU9t+fYuruji6+laUcs6 UnCng6BcdB7yF8DLHN6LpqQDsWsAoS5KbB84BbmoO/35D3s/6TkTqmydFW7atw+np343 IftJe77NrK2rUbZ5jJ7tB2zyseRG/CNlTr3gk/ZLWRvIYyJ6cU5w/3IWldHh45/MzENF Skdw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=U5PweF5Md6NbIdnNvsH2BayzCnZUUA5GzHDCZFW7bFw=; b=OOsPViDoqQp1lopBhUdoFj1wsEZumJuj5fMiGu1gjWxQqshheEwgctEsmwz1itAqR+ 2XEILNC+iGZIJsxw3QeXy3JPgQIeDyofE+06J8kjVj9QerX9zGhXx/0vV9W4lOvHIAmv ufQVdQT3iEwI7DQDMFp3nVWqFFumeacjU5y9LDgS1CDOd6/W4dpYCRYwqqZtgC5n3q4X OVnPrQxNRFojdPd5A8u+8I91cJXrSaZHm+N3cA/S5pHC0UJvzkDX0epoSlp9sMrbrnj+ un/bvHdA5WaftWHyr8dN0dPFSyqAVbvHHlgQr7mKvs5FbKkWc0nEQE3Uw9wmK7HMs3e2 RPew== X-Gm-Message-State: AO0yUKWkvFraO6mfo3d0fEmgOoZpqx723K+qJbXJv3JhhYY4hBdYG1G9 FF9ZO8U98MBRL45jVkeUOszbZseA7Q== X-Google-Smtp-Source: AK7set8VJGEtbKBZlU6hCuahzp1rc7G7d7am0mQLFXrImBHYa3g9f/I+bQ2PeH4yNwPIDrBhDJ5z+OkK4A== X-Received: from rmoar-specialist.c.googlers.com ([fda3:e722:ac3:cc00:2b:7d90:c0a8:45d3]) (user=rmoar job=sendgmr) by 2002:a81:61c6:0:b0:50e:8ebe:45be with SMTP id v189-20020a8161c6000000b0050e8ebe45bemr193751ywb.214.1674850361795; Fri, 27 Jan 2023 12:12:41 -0800 (PST) Date: Fri, 27 Jan 2023 20:12:19 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.39.1.456.gfc5497dd1b-goog Message-ID: <20230127201219.775410-1-rmoar@google.com> Subject: [PATCH v1] apparmor: fix use of strcpy in policy_unpack_test From: Rae Moar To: john.johansen@canonical.com, brendanhiggins@google.com, davidgow@google.com, dlatypov@google.com Cc: apparmor@lists.ubuntu.com, skhan@linuxfoundation.org, kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Rae Moar , kernel test robot Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Replace the use of strcpy() in build_aa_ext_struct() in policy_unpack_test.c with strscpy(). strscpy() is the safer method to use to ensure the buffer does not overflow. This was found by kernel test robot: https://lore.kernel.org/all/202301040348.NbfVsXO0-lkp@intel.com/. Reported-by: kernel test robot Signed-off-by: Rae Moar --- Note: This patch is based on the apparmor-next branch. However, the patch should also apply cleanly to the kselftest/kunit branch. security/apparmor/policy_unpack_test.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2 diff --git a/security/apparmor/policy_unpack_test.c b/security/apparmor/policy_unpack_test.c index e1bfdab524b7..5c9bde25e56d 100644 --- a/security/apparmor/policy_unpack_test.c +++ b/security/apparmor/policy_unpack_test.c @@ -69,31 +69,30 @@ static struct aa_ext *build_aa_ext_struct(struct policy_unpack_fixture *puf, *buf = AA_NAME; *(buf + 1) = strlen(TEST_STRING_NAME) + 1; - strcpy(buf + 3, TEST_STRING_NAME); + strscpy(buf + 3, TEST_STRING_NAME, e->end - (void *)(buf + 3)); buf = e->start + TEST_STRING_BUF_OFFSET; *buf = AA_STRING; *(buf + 1) = strlen(TEST_STRING_DATA) + 1; - strcpy(buf + 3, TEST_STRING_DATA); - + strscpy(buf + 3, TEST_STRING_DATA, e->end - (void *)(buf + 3)); buf = e->start + TEST_NAMED_U32_BUF_OFFSET; *buf = AA_NAME; *(buf + 1) = strlen(TEST_U32_NAME) + 1; - strcpy(buf + 3, TEST_U32_NAME); + strscpy(buf + 3, TEST_U32_NAME, e->end - (void *)(buf + 3)); *(buf + 3 + strlen(TEST_U32_NAME) + 1) = AA_U32; *((u32 *)(buf + 3 + strlen(TEST_U32_NAME) + 2)) = TEST_U32_DATA; buf = e->start + TEST_NAMED_U64_BUF_OFFSET; *buf = AA_NAME; *(buf + 1) = strlen(TEST_U64_NAME) + 1; - strcpy(buf + 3, TEST_U64_NAME); + strscpy(buf + 3, TEST_U64_NAME, e->end - (void *)(buf + 3)); *(buf + 3 + strlen(TEST_U64_NAME) + 1) = AA_U64; *((u64 *)(buf + 3 + strlen(TEST_U64_NAME) + 2)) = TEST_U64_DATA; buf = e->start + TEST_NAMED_BLOB_BUF_OFFSET; *buf = AA_NAME; *(buf + 1) = strlen(TEST_BLOB_NAME) + 1; - strcpy(buf + 3, TEST_BLOB_NAME); + strscpy(buf + 3, TEST_BLOB_NAME, e->end - (void *)(buf + 3)); *(buf + 3 + strlen(TEST_BLOB_NAME) + 1) = AA_BLOB; *(buf + 3 + strlen(TEST_BLOB_NAME) + 2) = TEST_BLOB_DATA_SIZE; memcpy(buf + 3 + strlen(TEST_BLOB_NAME) + 6, @@ -102,7 +101,7 @@ static struct aa_ext *build_aa_ext_struct(struct policy_unpack_fixture *puf, buf = e->start + TEST_NAMED_ARRAY_BUF_OFFSET; *buf = AA_NAME; *(buf + 1) = strlen(TEST_ARRAY_NAME) + 1; - strcpy(buf + 3, TEST_ARRAY_NAME); + strscpy(buf + 3, TEST_ARRAY_NAME, e->end - (void *)(buf + 3)); *(buf + 3 + strlen(TEST_ARRAY_NAME) + 1) = AA_ARRAY; *((u16 *)(buf + 3 + strlen(TEST_ARRAY_NAME) + 2)) = TEST_ARRAY_SIZE;