linux-kernel - Re: [PATCH v3 10/16] exec: Remove do_execve

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Message-ID: <20200712210243.GB983@bug>
Date:   Sun, 12 Jul 2020 23:02:43 +0200
From:   Pavel Machek <pavel@....cz>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
        Greg Kroah-Hartman <greg@...ah.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>, bpf <bpf@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Gary Lin <GLin@...e.com>, Bruno Meneguele <bmeneg@...hat.com>,
        LSM List <linux-security-module@...r.kernel.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v3 10/16] exec: Remove do_execve_file

On Thu 2020-07-02 11:41:34, Eric W. Biederman wrote:
> Now that the last callser has been removed remove this code from exec.

Typo "caller".

> For anyone thinking of resurrecing do_execve_file please note that

resurrecting?

> the code was buggy in several fundamental ways.
> 
> - It did not ensure the file it was passed was read-only and that
>   deny_write_access had been called on it.  Which subtlely breaks
>   invaniants in exec.

subtly, invariants?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html