linux-kernel - Re: [PATCH v2] prctl: fix compat handling for prctl

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Message-ID: <130bb5d0-e6a8-932b-3f56-ef021f10a8ba@huawei.com>
Date:   Thu, 19 Apr 2018 14:03:55 +0800
From:   "Libin (Huawei)" <huawei.libin@...wei.com>
To:     Andy Lutomirski <luto@...nel.org>
CC:     Al Viro <viro@...iv.linux.org.uk>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v2] prctl: fix compat handling for prctl



在 2018/4/19 10:25, Andy Lutomirski 写道:
>> On Apr 18, 2018, at 9:06 PM, Li Bin <huawei.libin@...wei.com> wrote:
>>
>> The member auxv in prctl_mm_map structure which be shared with
>> userspace is pointer type, but the kernel supporting COMPAT didn't
>> handle it. This patch fix the compat handling for prctl syscall.
> 
> I would propose an alternative fix: change the type to u64. As far as

But we also need to modify the sys/prctl.h in Glibc, right?

> I know, this thing is only used by CRIU, and CRIU doesn’t work (AFAIK)
> on native 32-bit anyway.   Do you know of some reason that this
> wouldn't work?
> 
> .
>