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Fri, 15 Feb 2019 23:55:17 +0000 (UTC) Received: from IN01WEHTCA.internal.synopsys.com (10.144.199.104) by US01WEHTC3.internal.synopsys.com (10.15.84.232) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 15 Feb 2019 15:55:17 -0800 Received: from IN01WEHTCB.internal.synopsys.com (10.144.199.105) by IN01WEHTCA.internal.synopsys.com (10.144.199.103) with Microsoft SMTP Server (TLS) id 14.3.408.0; Sat, 16 Feb 2019 05:25:20 +0530 Received: from [10.10.161.59] (10.10.161.59) by IN01WEHTCB.internal.synopsys.com (10.144.199.243) with Microsoft SMTP Server (TLS) id 14.3.408.0; Sat, 16 Feb 2019 05:25:19 +0530 Subject: Re: [PATCH v2 1/2] ARC: U-boot: check arguments paranoidly To: Eugeniy Paltsev , CC: , Alexey Brodkin , , Corentin Labbe Newsgroups: gmane.linux.kernel.arc,gmane.linux.kernel References: <20190214150745.18773-1-Eugeniy.Paltsev@synopsys.com> <20190214150745.18773-2-Eugeniy.Paltsev@synopsys.com> From: Vineet Gupta Openpgp: preference=signencrypt Autocrypt: addr=vgupta@synopsys.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190214150745.18773-2-Eugeniy.Paltsev@synopsys.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.10.161.59] Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [...] > -char __initdata *uboot_arg; > +unsigned int __initdata uboot_arg; Why ? In both places it is actually used, it is intended as a pointer. The cast for range check is needed but lets cast there. See below for real reason. > -static inline int is_kernel(unsigned long addr) > +static inline bool uboot_arg_invalid(unsigned int addr) > { > - if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end) > - return 1; > + > + /* Check that address doesn't clobber resident kernel image */ > + return addr >= (unsigned int)_stext && addr <= (unsigned int)_end; ... > + > + /* see if U-boot passed an external Device Tree blob */ > + if (uboot_tag == UBOOT_TAG_DTB) { > + machine_desc = setup_machine_fdt((void *)uboot_arg); On a 64-bit paradigm, with LP64 ABI, this will break since int will be 4b, while pointer 8b. I'll fix it up locally and push ! -Vineet