linux-kernel - Re: [PATCH V5 17/21] riscv: compat: vdso: Add setup additional pages implementation

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Message-ID: <4379941.LvFx2qVVIh@eto.sf-tec.de>
Date:   Wed, 23 Feb 2022 13:12:03 +0100
From:   Rolf Eike Beer <eb@...ix.com>
To:     guoren@...nel.org, palmer@...belt.com, arnd@...db.de,
        anup@...infault.org, gregkh@...uxfoundation.org,
        liush@...winnertech.com, wefu@...hat.com, drew@...gleboard.org,
        wangjunqiang@...as.ac.cn, hch@....de, guoren@...nel.org
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-parisc@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V5 17/21] riscv: compat: vdso: Add setup additional pages implementation

> @@ -66,35 +68,35 @@ static int vdso_mremap(const struct vm_special_mapping
> *sm, return 0;
>  }
> 
> -static int __init __vdso_init(void)
> +static int __init __vdso_init(struct __vdso_info *vdso_info)
>  {
>  	unsigned int i;
>  	struct page **vdso_pagelist;
>  	unsigned long pfn;
> 
> -	if (memcmp(vdso_info.vdso_code_start, "\177ELF", 4)) {
> +	if (memcmp(vdso_info->vdso_code_start, "\177ELF", 4)) {
>  		pr_err("vDSO is not a valid ELF object!\n");
>  		return -EINVAL;
>  	}
> 

Does anyone actually guarantee that this is at least this 4 bytes long?

Eike
-- 
Rolf Eike Beer, emlix GmbH, https://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11
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