linux-kernel - Re: [fs/exec] 80bd5afdd8: xfstests.generic.633.fail

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Date:   Mon, 31 Jan 2022 13:59:40 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        kernel test robot <oliver.sang@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Ariadne Conill <ariadne@...eferenced.org>,
        0day robot <lkp@...el.com>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Rich Felker <dalias@...c.org>,
        Eric Biederman <ebiederm@...ssion.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        stable@...r.kernel.org
Subject: Re: [fs/exec]  80bd5afdd8: xfstests.generic.633.fail

On Mon, 31 Jan 2022 18:13:44 +0100 Christian Brauner <brauner@...nel.org> wrote:

> > in other words, the changes that you see CMD_ARGS[0] == NULL for
> > execveat() seem higher than for path-based exec.
> > 
> > To counter that we should probably at least update the execveat()
> > manpage with a recommendation what CMD_ARGS[0] should be set to if it
> > isn't allowed to be set to NULL anymore. This is why was asking what
> > argv[0] is supposed to be if the binary doesn't take any arguments.
> 
> Sent a fix to our fstests now replacing the argv[0] as NULL with "".

As we hit this check so quickly, I'm thinking that Ariadne's patch
"fs/exec: require argv[0] presence in do_execveat_common()" (which
added the check) isn't something we'll be able to merge into mainline?