linux-kernel - Re: [PATCH] mm/migrate: Avoid possible unnecessary ptrace_may_access() call in kernel_move

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Message-ID: <8e7c7a77722446afbc8cb25e46eab325@huawei.com>
Date:   Tue, 18 Aug 2020 02:25:49 +0000
From:   linmiaohe <linmiaohe@...wei.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/migrate: Avoid possible unnecessary
 ptrace_may_access() call in kernel_move_pages()

Matthew Wilcox <willy@...radead.org> wrote:
>On Mon, Aug 17, 2020 at 07:59:33AM -0400, Miaohe Lin wrote:
>> There is no need to check if this process has the right to modify the 
>> specified process when they are same.
>
>We should probably also skip the security hook call if a process is modifying its own pages.
>
>How about this instead?
>

It sounds good, thanks for your good advice. Would you like a tag like suggest-by?