linux-kernel - Re: [PATCH] binfmt_misc: pass binfmt

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Message-ID: <87mu8t3mlw.fsf@mid.deneb.enyo.de>
Date:   Fri, 06 Mar 2020 09:37:31 +0100
From:   Florian Weimer <fw@...eb.enyo.de>
To:     Laurent Vivier <laurent@...ier.eu>
Cc:     YunQiang Su <syq@...ian.org>, torvalds@...ux-foundation.org,
        gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
        viro@...iv.linux.org.uk, James.Bottomley@...senpartnership.com,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        libc-alpha@...rceware.org
Subject: Re: [PATCH] binfmt_misc: pass binfmt_misc P flag to the interpreter

* Laurent Vivier:

> Le 06/03/2020 à 09:13, Florian Weimer a écrit :
>> * YunQiang Su:
>> 
>>> +	if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0)
>>> +		flags |= AT_FLAGS_PRESERVE_ARGV0;
>>> +	NEW_AUX_ENT(AT_FLAGS, flags);
>> 
>> Is it necessary to reuse AT_FLAGS?  I think it's cleaner to define a
>> separate AT_ tag dedicated to binfmt_misc.
>
> Not necessary, but it seemed simpler and cleaner to re-use a flag that
> is marked as unused and with a name matching the new role. It avoids to
> patch other packages (like glibc) to add it as it is already defined.

You still need to define AT_FLAGS_PRESERVE_ARGV0.  At that point, you
might as well define AT_BINFMT and AT_BINFMT_PRESERVE_ARGV0.