From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Fri, 12 Oct 2018 01:48:04 +0200 (CEST) Received: from mga01.intel.com ([192.55.52.88]:13308 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S23994648AbeJKXsCNxfVx (ORCPT ); Fri, 12 Oct 2018 01:48:02 +0200 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Oct 2018 16:48:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,370,1534834800"; d="scan'208";a="98673601" Received: from kgowx-mobl9.amr.corp.intel.com (HELO [10.254.73.197]) ([10.254.73.197]) by orsmga001.jf.intel.com with ESMTP; 11 Oct 2018 16:47:29 -0700 Subject: Re: [PATCH v2 4/7] arm64/modules: Add rlimit checking for arm64 modules To: Rick Edgecombe , kernel-hardening@lists.openwall.com, daniel@iogearbox.net, keescook@chromium.org, catalin.marinas@arm.com, will.deacon@arm.com, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, arnd@arndb.de, jeyu@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@linux-mips.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org References: <20181011233117.7883-1-rick.p.edgecombe@intel.com> <20181011233117.7883-5-rick.p.edgecombe@intel.com> Cc: kristen@linux.intel.com, arjan@linux.intel.com, deneen.t.dock@intel.com From: Dave Hansen Openpgp: preference=signencrypt Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181011233117.7883-5-rick.p.edgecombe@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 66755 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: dave.hansen@intel.com Precedence: bulk List-help: List-unsubscribe: List-software: Ecartis version 1.0.0 List-Id: linux-mips X-List-ID: linux-mips List-subscribe: List-owner: List-post: List-archive: X-list: linux-mips On 10/11/2018 04:31 PM, Rick Edgecombe wrote: > + if (check_inc_mod_rlimit(size)) > + return NULL; > + > p = __vmalloc_node_range(size, MODULE_ALIGN, module_alloc_base, > module_alloc_base + MODULES_VSIZE, > gfp_mask, PAGE_KERNEL_EXEC, 0, > @@ -65,6 +68,8 @@ void *module_alloc(unsigned long size) > return NULL; > } > > + update_mod_rlimit(p, size); Is there a reason we couldn't just rename all of the existing per-arch module_alloc() calls to be called, say, "arch_module_alloc()", then put this new rlimit code in a generic helper that does: if (check_inc_mod_rlimit(size)) return NULL; p = arch_module_alloc(...); ... update_mod_rlimit(p, size);