From patchwork Wed Oct 23 13:43:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vit Mojzis X-Patchwork-Id: 13847120 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8897A1AAE02 for ; Wed, 23 Oct 2024 13:43:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729691035; cv=none; b=gXgYD7uPn7yqR1iT3ZEL3EBC56DjC//QWXLVViHjW4WjisAGPSOYqUqvRgKwwbSOqmHUQCkeAaTTcMQmV8lWsXPZj2Ve0p+w3Y8GPOjiyVqa6ru9RXtqFojmHWJX6x41khtEJ6Kc6ketggwhOyyJaCxxA5YMEoDeq0taZ0UTTUA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729691035; c=relaxed/simple; bh=a58WhftuYwmQhPFE68btykTXHEJ0TAPMyWbaywwjrCc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BYbtRwTDpjs7iRj7HZZOL1E8TGzJX+Gw1TrOO73WrdY85IIfqdcU6A5B9VsRkjmpCXiyRhphsH6VmMyHRvzL+7BVs3OoavYDj/p47QJdFxYwl9PkR0FFdlQNl4Uv1ResboBLctqWZD1ZA0cCJoYRX5VM8n3Lcfo1HYKq/V+f7Ck= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=I0jrLq6y; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="I0jrLq6y" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729691032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=uDC8es8Dnm4/AG+tkdPlI3NpIOUFXCnikfcCobDEcU0=; b=I0jrLq6yGgtC55vUyll/MDBVATEUfGdwznFKKkJAkfJfHgMIk16y4VMjaZGwyoF7nVReZ5 FYdTD488Y6Kc+lvH2vpqgv+B+mBkpjMb4/CdGjCTN08zGY528VBFXBz8nczdlWknqIV4Nz ruB1mh8WQStA085bd1vv4GjIRvRUwIo= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-77-bUcv4vo4PNWiydbrvfFHIg-1; Wed, 23 Oct 2024 09:43:51 -0400 X-MC-Unique: bUcv4vo4PNWiydbrvfFHIg-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (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 mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0D67C1936DAA for ; Wed, 23 Oct 2024 13:43:36 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.225.164]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 4CC571956046 for ; Wed, 23 Oct 2024 13:43:35 +0000 (UTC) From: Vit Mojzis To: selinux@vger.kernel.org Subject: [PATCH v2 2/4] libsepol/mls: Do not destroy context on memory error Date: Wed, 23 Oct 2024 15:43:16 +0200 Message-ID: <20241023134318.733305-2-vmojzis@redhat.com> In-Reply-To: <20241023134318.733305-1-vmojzis@redhat.com> References: <20241023134318.733305-1-vmojzis@redhat.com> Precedence: bulk X-Mailing-List: selinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 In case of malloc error, ctx1, or ctx2 may be pointing to uninitialized space and context_destroy should not be used on it. Fixes: Error: UNINIT (CWE-457): libsepol-3.7/src/mls.c:673:2: alloc_fn: Calling "malloc" which returns uninitialized memory. libsepol-3.7/src/mls.c:673:2: assign: Assigning: "ctx1" = "malloc(64UL)", which points to uninitialized data. libsepol-3.7/src/mls.c:699:2: uninit_use_in_call: Using uninitialized value "ctx1->range.level[0].cat.node" when calling "context_destroy". \# 697| ERR(handle, "could not check if mls context %s contains %s", \# 698| mls1, mls2); \# 699|-> context_destroy(ctx1); \# 700| context_destroy(ctx2); \# 701| free(ctx1); Error: UNINIT (CWE-457): libsepol-3.7/src/mls.c:674:2: alloc_fn: Calling "malloc" which returns uninitialized memory. libsepol-3.7/src/mls.c:674:2: assign: Assigning: "ctx2" = "malloc(64UL)", which points to uninitialized data. libsepol-3.7/src/mls.c:700:2: uninit_use_in_call: Using uninitialized value "ctx2->range.level[0].cat.node" when calling "context_destroy". \# 698| mls1, mls2); \# 699| context_destroy(ctx1); \# 700|-> context_destroy(ctx2); \# 701| free(ctx1); \# 702| free(ctx2); Signed-off-by: Vit Mojzis --- libsepol/src/mls.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/libsepol/src/mls.c b/libsepol/src/mls.c index 45db8920..a37405d1 100644 --- a/libsepol/src/mls.c +++ b/libsepol/src/mls.c @@ -672,8 +672,10 @@ int sepol_mls_contains(sepol_handle_t * handle, context_struct_t *ctx1 = NULL, *ctx2 = NULL; ctx1 = malloc(sizeof(context_struct_t)); ctx2 = malloc(sizeof(context_struct_t)); - if (ctx1 == NULL || ctx2 == NULL) + if (ctx1 == NULL || ctx2 == NULL){ + ERR(handle, "out of memory"); goto omem; + } context_init(ctx1); context_init(ctx2); @@ -690,16 +692,14 @@ int sepol_mls_contains(sepol_handle_t * handle, free(ctx2); return STATUS_SUCCESS; - omem: - ERR(handle, "out of memory"); - err: - ERR(handle, "could not check if mls context %s contains %s", - mls1, mls2); context_destroy(ctx1); context_destroy(ctx2); + omem: free(ctx1); free(ctx2); + ERR(handle, "could not check if mls context %s contains %s", + mls1, mls2); return STATUS_ERR; }