linux-kernel - Re: [PATCH v7 16/26] x86/insn-eval: Support both signed 32-bit and 64-bit effective addresses

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Message-ID: <20170607154924.ddvy6mwojvnjqp6k@pd.tnic>
Date:   Wed, 7 Jun 2017 17:49:24 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brian Gerst <brgerst@...il.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Huang Rui <ray.huang@....com>, Jiri Slaby <jslaby@...e.cz>,
        Jonathan Corbet <corbet@....net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Chen Yucong <slaoub@...il.com>,
        Alexandre Julliard <julliard@...ehq.org>,
        Stas Sergeev <stsp@...t.ru>, Fenghua Yu <fenghua.yu@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-msdos@...r.kernel.org, wine-devel@...ehq.org,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Colin Ian King <colin.king@...onical.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Qiaowei Ren <qiaowei.ren@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v7 16/26] x86/insn-eval: Support both signed 32-bit and
 64-bit effective addresses

On Fri, May 05, 2017 at 11:17:14AM -0700, Ricardo Neri wrote:
> @@ -697,18 +753,21 @@ void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs)
>  {
>  	unsigned long linear_addr, seg_base_addr, seg_limit;
>  	long eff_addr, base, indx;
> -	int addr_offset, base_offset, indx_offset;
> +	int addr_offset, base_offset, indx_offset, addr_bytes;
>  	insn_byte_t sib;
>  
>  	insn_get_modrm(insn);
>  	insn_get_sib(insn);
>  	sib = insn->sib.value;
> +	addr_bytes = insn->addr_bytes;
>  
>  	if (X86_MODRM_MOD(insn->modrm.value) == 3) {
>  		addr_offset = get_reg_offset(insn, regs, REG_TYPE_RM);
>  		if (addr_offset < 0)
>  			goto out_err;
> -		eff_addr = regs_get_register(regs, addr_offset);
> +		eff_addr = get_mem_offset(regs, addr_offset, addr_bytes);
> +		if (eff_addr == -1L)
> +			goto out_err;
>  		seg_base_addr = insn_get_seg_base(regs, insn, addr_offset);
>  		if (seg_base_addr == -1L)
>  			goto out_err;

This code here is too dense, it needs spacing for better readability.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--