linux-kernel - Re: [PATCH v2 13/24] kcmp: In get_file_raw_ptr use task_lookup_fd

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Message-ID: <20201123210513.GJ875895@grain>
Date:   Tue, 24 Nov 2020 00:05:13 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        criu@...nvz.org, bpf@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Oleg Nesterov <oleg@...hat.com>, Jann Horn <jann@...jh.net>,
        Kees Cook <keescook@...omium.org>,
        Daniel P . Berrangé <berrange@...hat.com>,
        Jeff Layton <jlayton@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Matthew Wilcox <willy@...radead.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Chris Wright <chrisw@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>
Subject: Re: [PATCH v2 13/24] kcmp: In get_file_raw_ptr use task_lookup_fd_rcu

On Fri, Nov 20, 2020 at 05:14:30PM -0600, Eric W. Biederman wrote:
> Modify get_file_raw_ptr to use task_lookup_fd_rcu.  The helper
> task_lookup_fd_rcu does the work of taking the task lock and verifying
> that task->files != NULL and then calls files_lookup_fd_rcu.  So let
> use the helper to make a simpler implementation of get_file_raw_ptr.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Acked-by: Cyrill Gorcunov <gorcunov@...il.com>

Since I wrote this kcmp code in first place. Thanks Eric!