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 X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57A78C33CB1 for ; Thu, 16 Jan 2020 12:04:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2087320663 for ; Thu, 16 Jan 2020 12:04:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ECnEM9C5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726418AbgAPMEu (ORCPT ); Thu, 16 Jan 2020 07:04:50 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:34191 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726370AbgAPMEu (ORCPT ); Thu, 16 Jan 2020 07:04:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579176289; h=from:from:reply-to:subject:subject: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=bRaN52YTMMuNLgx5s8xMuqSbhmEOKfw+1zF4Z+2ioCo=; b=ECnEM9C5GWunCPLZ3YRk76q2IL0L/gGcsi2nnU3Ea7Z2GPGUaSkAzS3/Yxcrv9AFzoesrA DlSoQl19Cxroj+bk/8omnuJTeYXFHOPobDDXRwVx+psm+Zin9casV86ioZGmXwA8k4KnHe GARSTeXsc74ZyeT+xaNHsXrx9e7rH4c= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-389-3Utw1DsNNMaAta2AqEhDag-1; Thu, 16 Jan 2020 07:04:48 -0500 X-MC-Unique: 3Utw1DsNNMaAta2AqEhDag-1 Received: by mail-wr1-f72.google.com with SMTP id y7so9225999wrm.3 for ; Thu, 16 Jan 2020 04:04:47 -0800 (PST) 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=bRaN52YTMMuNLgx5s8xMuqSbhmEOKfw+1zF4Z+2ioCo=; b=NFFwg6sAyUwA+H/kN/zAJL3aPtBrw9NTSRU1hSI0oZvLp8FKgEFrxAImMTdEDRxw/j h2mXBFxsfYmNgxfbBJmS+u4JCoPUCIjUelX3jnWucBsUCcXYb00s+l2jEI6cK2tOfGE+ fcuX9EsOvBR19JyLjwzVZGHeCPz4UN4lE2ndu0yNaFolmlXCj2TJYN4BkFU0qiKtcJkG Cl4qDOgbvSYNkzEsWbdj7WMGv8A2xbFAMLvapKAYofnv5zCAy7Y/Rxx2nkSXs9hC25wy //k/3Mn/y/FX5toFmS7YuGpStMIPeJpQ5njg9wbpN7PpBm9v9G+4aKDGHFUEn3RLV262 rd8Q== X-Gm-Message-State: APjAAAWGGWqo4cmQW8+UHhnvKVzI+PFWxM2ThZGIdLM7IsAqD4wGUVaN upMHvcYs47uLikTNMtaH6MPOZnwfwuT+gagannyX7Nw7OnnDlykyM1Z5Qmocb+htjaQRmQjXsAx h70HOY1ck3zJfTQ11mQ== X-Received: by 2002:a1c:3dd5:: with SMTP id k204mr5711689wma.92.1579176286640; Thu, 16 Jan 2020 04:04:46 -0800 (PST) X-Google-Smtp-Source: APXvYqxiOMHCBvhp8jWPSVJwECTlCSNKtQ98RRX12qwvpyaCBJIuZF7+Nn8k5VIfXqw+fb++S+iHWA== X-Received: by 2002:a1c:3dd5:: with SMTP id k204mr5711668wma.92.1579176286365; Thu, 16 Jan 2020 04:04:46 -0800 (PST) Received: from omos.redhat.com (nat-pool-brq-t.redhat.com. [213.175.37.10]) by smtp.gmail.com with ESMTPSA id b67sm278117wmc.38.2020.01.16.04.04.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jan 2020 04:04:45 -0800 (PST) From: Ondrej Mosnacek To: selinux@vger.kernel.org, Paul Moore Cc: Stephen Smalley Subject: [PATCH 5/6] selinux: convert cond_expr to array Date: Thu, 16 Jan 2020 13:04:38 +0100 Message-Id: <20200116120439.303034-6-omosnace@redhat.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200116120439.303034-1-omosnace@redhat.com> References: <20200116120439.303034-1-omosnace@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: selinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux@vger.kernel.org Since it is fixed-size after allocation and we know the size beforehand, using a plain old array is simpler and more efficient. Signed-off-by: Ondrej Mosnacek --- security/selinux/ss/conditional.c | 62 ++++++++++++------------------- security/selinux/ss/conditional.h | 14 ++++--- 2 files changed, 33 insertions(+), 43 deletions(-) diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c index b847fd2a6a51..8f9f2f3c86a0 100644 --- a/security/selinux/ss/conditional.c +++ b/security/selinux/ss/conditional.c @@ -23,18 +23,19 @@ */ static int cond_evaluate_expr(struct policydb *p, struct cond_expr *expr) { - - struct cond_expr *cur; + u32 i; int s[COND_EXPR_MAXDEPTH]; int sp = -1; - for (cur = expr; cur; cur = cur->next) { - switch (cur->expr_type) { + for (i = 0; i < expr->len; i++) { + struct cond_expr_node *node = &expr->nodes[i]; + + switch (node->expr_type) { case COND_BOOL: if (sp == (COND_EXPR_MAXDEPTH - 1)) return -1; sp++; - s[sp] = p->bool_val_to_struct[cur->bool - 1]->state; + s[sp] = p->bool_val_to_struct[node->bool - 1]->state; break; case COND_NOT: if (sp < 0) @@ -91,7 +92,7 @@ void evaluate_cond_node(struct policydb *p, struct cond_node *node) int new_state; u32 i; - new_state = cond_evaluate_expr(p, node->expr); + new_state = cond_evaluate_expr(p, &node->expr); if (new_state != node->cur_state) { node->cur_state = new_state; if (new_state == -1) @@ -133,12 +134,7 @@ int cond_policydb_init(struct policydb *p) static void cond_node_destroy(struct cond_node *node) { - struct cond_expr *cur_expr, *next_expr; - - for (cur_expr = node->expr; cur_expr; cur_expr = next_expr) { - next_expr = cur_expr->next; - kfree(cur_expr); - } + kfree(node->expr.nodes); /* the avtab_ptr_t nodes are destroyed by the avtab */ kfree(node->true_list.nodes); kfree(node->false_list.nodes); @@ -354,7 +350,7 @@ static int cond_read_av_list(struct policydb *p, void *fp, return 0; } -static int expr_isvalid(struct policydb *p, struct cond_expr *expr) +static int expr_node_isvalid(struct policydb *p, struct cond_expr_node *expr) { if (expr->expr_type <= 0 || expr->expr_type > COND_LAST) { pr_err("SELinux: conditional expressions uses unknown operator.\n"); @@ -371,43 +367,37 @@ static int expr_isvalid(struct policydb *p, struct cond_expr *expr) static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp) { __le32 buf[2]; - u32 len, i; + u32 i, len; int rc; - struct cond_expr *expr = NULL, *last = NULL; rc = next_entry(buf, fp, sizeof(u32) * 2); if (rc) - goto err; + return rc; node->cur_state = le32_to_cpu(buf[0]); /* expr */ len = le32_to_cpu(buf[1]); + node->expr.nodes = kcalloc(len, sizeof(*node->expr.nodes), GFP_KERNEL); + if (!node->expr.nodes) + return -ENOMEM; + + node->expr.len = len; for (i = 0; i < len; i++) { + struct cond_expr_node *expr = &node->expr.nodes[i]; + rc = next_entry(buf, fp, sizeof(u32) * 2); if (rc) goto err; - rc = -ENOMEM; - expr = kzalloc(sizeof(*expr), GFP_KERNEL); - if (!expr) - goto err; - expr->expr_type = le32_to_cpu(buf[0]); expr->bool = le32_to_cpu(buf[1]); - if (!expr_isvalid(p, expr)) { + if (!expr_node_isvalid(p, expr)) { rc = -EINVAL; - kfree(expr); goto err; } - - if (i == 0) - node->expr = expr; - else - last->next = expr; - last = expr; } rc = cond_read_av_list(p, fp, &node->true_list, NULL); @@ -512,27 +502,23 @@ static int cond_write_av_list(struct policydb *p, static int cond_write_node(struct policydb *p, struct cond_node *node, struct policy_file *fp) { - struct cond_expr *cur_expr; __le32 buf[2]; int rc; - u32 len = 0; + u32 i; buf[0] = cpu_to_le32(node->cur_state); rc = put_entry(buf, sizeof(u32), 1, fp); if (rc) return rc; - for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next) - len++; - - buf[0] = cpu_to_le32(len); + buf[0] = cpu_to_le32(node->expr.len); rc = put_entry(buf, sizeof(u32), 1, fp); if (rc) return rc; - for (cur_expr = node->expr; cur_expr != NULL; cur_expr = cur_expr->next) { - buf[0] = cpu_to_le32(cur_expr->expr_type); - buf[1] = cpu_to_le32(cur_expr->bool); + for (i = 0; i < node->expr.len; i++) { + buf[0] = cpu_to_le32(node->expr.nodes[i].expr_type); + buf[1] = cpu_to_le32(node->expr.nodes[i].bool); rc = put_entry(buf, sizeof(u32), 2, fp); if (rc) return rc; diff --git a/security/selinux/ss/conditional.h b/security/selinux/ss/conditional.h index 5f97f678440e..4677c6ff7450 100644 --- a/security/selinux/ss/conditional.h +++ b/security/selinux/ss/conditional.h @@ -19,7 +19,7 @@ * A conditional expression is a list of operators and operands * in reverse polish notation. */ -struct cond_expr { +struct cond_expr_node { #define COND_BOOL 1 /* plain bool */ #define COND_NOT 2 /* !bool */ #define COND_OR 3 /* bool || bool */ @@ -28,9 +28,13 @@ struct cond_expr { #define COND_EQ 6 /* bool == bool */ #define COND_NEQ 7 /* bool != bool */ #define COND_LAST COND_NEQ - __u32 expr_type; - __u32 bool; - struct cond_expr *next; + u32 expr_type; + u32 bool; +}; + +struct cond_expr { + struct cond_expr_node *nodes; + u32 len; }; /* @@ -52,7 +56,7 @@ struct cond_av_list { */ struct cond_node { int cur_state; - struct cond_expr *expr; + struct cond_expr expr; struct cond_av_list true_list; struct cond_av_list false_list; }; -- 2.24.1